CN107642622B - Water bath system for chemistry experiments - Google Patents
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- CN107642622B CN107642622B CN201710932008.5A CN201710932008A CN107642622B CN 107642622 B CN107642622 B CN 107642622B CN 201710932008 A CN201710932008 A CN 201710932008A CN 107642622 B CN107642622 B CN 107642622B
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Abstract
The invention discloses a water bath system for chemical experiments, which is characterized in that: the device comprises a constant temperature box and a temperature control valve, wherein a water jacket is arranged on the outer wall of the constant temperature box, a temperature sensing bulb is arranged at the bottom of the constant temperature box, and expansion liquid is contained in the temperature sensing bulb; an overflow pipe is arranged in the water jacket, the upper end of the overflow pipe is positioned at the top of the water jacket and is arranged in an opening, the lower end of the overflow pipe is positioned at the bottom of the water jacket and is provided with a horizontal pipe section after being bent, and the horizontal pipe section extends out of the side wall of the water jacket; the hot water hole is connected with a hot water source through a hot water pipe, the cold water hole is connected with a cold water source through a cold water pipe, the side wall of the water jacket is connected with a thermometer, the bottom of the water jacket is connected with an emptying pipe, and the emptying pipe is provided with an emptying valve. The invention is used for carrying out constant temperature control without using an electric control system, without arranging a temperature sensor and comparing and judging the water temperature with a set value by an electric control device, greatly reduces the equipment cost and the maintenance cost compared with the prior similar products, and is particularly suitable for being used in areas with unstable power supply.
Description
Technical Field
The invention relates to the technical field of chemical experiments, in particular to a water bath system for chemical experiments.
Background
The constant temperature water bath is a precise instrument for direct or auxiliary heating in the experimental science fields of biology, plants, physics, chemical engineering, medical treatment, environmental protection and the like, and the temperature interval is controlled by a temperature sensor, an electric control device and the like. A thermostatic water bath system is often required in chemical teaching and chemical research. The constant temperature water bath does not mean that the water temperature is absolutely constant, but means that the water temperature can be controlled within a range required by experiments. The existing constant-temperature water baths are all precise electric control equipment, and are high in acquisition cost and maintenance cost and not beneficial to popularization and application.
Disclosure of Invention
The invention aims to provide a water bath system for chemical experiments, which can carry out constant temperature control without depending on a temperature sensor and an electric control device.
In order to achieve the purpose, the water bath system for the chemical experiment comprises a constant temperature box and a temperature control valve, wherein a water jacket is arranged on the outer wall of the constant temperature box, a temperature sensing bulb is arranged at the bottom of the constant temperature box, and expansion liquid is contained in the temperature sensing bulb; an overflow pipe is arranged in the water jacket, the upper end of the overflow pipe is positioned at the top of the water jacket and is arranged in an opening, the lower end of the overflow pipe is positioned at the bottom of the water jacket and is provided with a horizontal pipe section after being bent, and the horizontal pipe section extends out of the side wall of the water jacket; the outer end of the horizontal pipe section is connected with an overflow drain hose; the water jacket above the overflow pipe is connected with an air release pipe;
the temperature control valve comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is connected with a valve core in a sliding manner, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively matched with the side wall of the inner cavity in a sliding and sealing manner; the side walls of the top block, the bottom block, the connecting column and the inner cavity are enclosed to form an annular cavity; a water outlet hole is arranged in the valve body on one side, the inner end of the water outlet hole is communicated with the inner cavity of the valve body, and the outer end of the water outlet hole is connected with a water outlet pipe which is communicated with the water jacket; hot water holes and cold water holes are arranged in the valve body at the opposite side of the water outlet hole at intervals, the inner ends of the hot water holes and the cold water holes are communicated with the inner cavity of the valve body, the outer end of the hot water hole is connected with a hot water pipe, and the outer end of the cold water hole is connected with a cold water pipe; the hot water hole is lower than the cold water hole;
a pressure spring is connected between the top end of the top block and the top wall of the inner cavity of the valve body; a push rod is pressed downwards on the bottom block, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and extends into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is formed in the fixed seat, and the lower part of the push rod extends downwards into the vertical through hole and is in sliding sealing fit with the wall of the vertical through hole; the lower end opening of the vertical through hole is connected with a connector, the connector is connected with an expansion pipe, and the expansion pipe extends into the constant temperature box and is communicated with the temperature sensing bulb;
the valve core is provided with an upper limit position and a lower limit position, and the water outlet hole is always communicated with the annular cavity when the valve core is positioned between the upper limit position and the lower limit position; when the valve core is positioned at the upper limit position, the cold water hole is completely communicated with the annular cavity, and when the valve core is positioned at the lower limit position, the hot water hole is completely communicated with the annular cavity; the height of the annular cavity is equal to the distance between the hot water hole and the cold water hole;
an upper positioning ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower positioning ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core;
the hot water hole is connected with a hot water source through a hot water pipe, the cold water hole is connected with a cold water source through a cold water pipe, a hot water valve is arranged on the hot water pipe, a cold water valve is arranged on the cold water pipe, and an expansion valve is arranged on the expansion pipe; the side wall of the water jacket is connected with a thermometer, the bottom of the water jacket is connected with an emptying pipe, and the emptying pipe is provided with an emptying valve.
The temperature sensing bag is connected with the regulating pipe, and the regulating pipe stretches out the thermostated container and is connected with the regulating box, is equipped with the governing valve on the regulating pipe, and the regulating box is higher than the temperature sensing bag.
The inner wall of the water jacket is connected with a horizontally arranged water distribution ring pipe, the water distribution ring pipe is communicated with a water outlet pipe, and the surface of the water distribution ring pipe is uniformly provided with a plurality of water distribution holes.
The hot water source is a hot water pipeline or a hot water tank or a water heater; the cold water source is a tap water pipeline or a cold water tank, and the expansion liquid is mercury or ethanol.
And a sealing ring is arranged on the upper surface of the fixed seat and surrounds the push rod.
The invention has the following advantages:
the invention has simple structure and convenient control, can utilize the characteristic that the volume of the expansion liquid changes along with the temperature change, combines the elasticity of the spring, and is communicated with hot water when the valve core is lower than the constant temperature position and is communicated with cold water when the valve core is higher than the constant temperature position, thereby keeping the temperature in the water jacket and the constant temperature box constant. The constant temperature control of the invention is realized without an electric control system, a temperature sensor is not needed, and the electric control device compares and judges the water temperature with a set value, thereby greatly reducing the equipment cost and the maintenance cost compared with the prior similar products, and being particularly suitable for being used in areas with unstable power supply.
The setting of governing valve can adjust the invariable temperature value that the water bath system provided through the degree of opening of control governing valve. When the set temperature of the water bath system needs to be reduced, the opening degree of the regulating valve is reduced, so that when the temperature of the temperature sensing liquid in the temperature sensing bag rises to the set temperature after being heated, more temperature sensing liquid enters the vertical through hole of the fixing seat, the push rod and the valve core are pushed to move upwards for more distance, and the valve core reaches the upper limit position earlier, which means that after the opening degree of the regulating valve is reduced, the hot water hole is closed at a lower temperature (before the opening degree of the regulating valve is reduced), the cold water hole is communicated, so that cold water enters the water jacket at a relatively lower temperature (before the opening degree of the regulating valve is reduced), and the set temperature value of the constant-temperature water bath system is reduced. In the same way, after the opening degree of the regulating valve is increased, the set temperature value of the constant-temperature water bath system can be increased.
In short, the arrangement of the regulating valve and the regulating box enables the invention to conveniently regulate the set temperature of the thermostat.
The setting of overflow pipe can enough guarantee that water jacket bottom goes out water and convenient external connection, can control the water level in the water jacket again, prevents that the water level from crossing the not good phenomenon of constant temperature effect that brings excessively in the water jacket.
The control process of the invention is simple and convenient, and the operator does not need to carry out special training, and can realize constant temperature control and adjust the set constant temperature value by simple connection and operation of opening and closing the valve.
The structure of the water distribution ring pipe can enable hot water or cold water to enter the water jacket more uniformly, so that the temperature of each position in the water jacket is more consistent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of a water distribution loop;
FIG. 3 is a schematic structural view of the thermostatic valve in cooperation with the fixed seat when the spool is in the upper limit position;
FIG. 4 is a schematic structural view of the thermostatic valve with the spool in the lower limit position;
fig. 5 is a schematic structural view of the thermo-valve with the spool in the constant temperature position.
Detailed Description
As shown in fig. 1 to 5, the water bath system for chemical experiments of the present invention comprises a thermostat 1 and a temperature control valve 2, wherein a water jacket 3 is arranged on the outer wall of the thermostat 1, a temperature sensing bulb 4 is arranged at the bottom of the thermostat 1, and an expansion liquid 5 is contained in the temperature sensing bulb 4; an overflow pipe 6 is arranged in the water jacket 3, the upper end of the overflow pipe 6 is positioned at the top of the water jacket 3 and is arranged in an open manner, the lower end of the overflow pipe 6 is positioned at the bottom of the water jacket 3 and is provided with a horizontal pipe section 7 after being bent, and the horizontal pipe section 7 extends out of the side wall of the water jacket 3; the outer end of the horizontal pipe section 7 is connected with an overflow drain hose 8; the water jacket 3 above the overflow pipe 6 is connected with an air release pipe 9;
the temperature control valve 2 comprises a valve body 10, a vertically arranged inner cavity 11 is arranged in the valve body 10, the horizontal section of the inner cavity 11 is circular, the side wall of the inner cavity 11 is connected with a valve core in a sliding manner, the valve core comprises a top block 12, a bottom block 13 and a connecting column 14 connected between the top block 12 and the bottom block 13, and the top block 12 and the bottom block 13 are respectively matched with the side wall of the inner cavity 11 in a sliding and sealing manner; the top block 12, the bottom block 13, the connecting column 14 and the side wall of the inner cavity 11 enclose an annular cavity 27; a water outlet hole 15 is arranged in the valve body 10 at one side, the inner end of the water outlet hole 15 is communicated with the inner cavity 11 of the valve body 10, the outer end of the water outlet hole 15 is connected with a water outlet pipe 16, and the water outlet pipe 16 is communicated with the water jacket 3; hot water holes 17 and cold water holes 18 are arranged in the valve body 10 at the opposite side of the water outlet hole 15 at intervals, the inner ends of the hot water holes 17 and the cold water holes 18 are communicated with the inner cavity 11 of the valve body 10, the outer end of the hot water hole 17 is connected with a hot water pipe 19, and the outer end of the cold water hole 18 is connected with a cold water pipe 20; the hot water hole 17 is lower than the cold water hole 18;
a pressure spring 21 is connected between the top end of the top block 12 and the top wall of the inner cavity 11 of the valve body 10; a push rod 22 is pressed on the bottom block 13 downwards, the diameter of the upper part of the push rod 22 is larger than that of the lower part, the upper part of the push rod 22 penetrates through the valve body 10 and extends into the inner cavity 11 of the valve body 10, the upper part of the push rod 22 is in sliding sealing fit with the valve body 10, and the top end of the push rod 22 is in pressing fit with the bottom block 13; a fixed seat 23 is arranged below the valve body 10, a vertical through hole 24 is arranged in the fixed seat 23, and the lower part of the push rod 22 extends downwards into the vertical through hole 24 and is in sliding sealing fit with the wall of the vertical through hole 24; the lower end opening of the vertical through hole 24 is connected with a connector 25, the connector 25 is connected with an expansion pipe 26, and the expansion pipe 26 extends into the thermostat 1 and is communicated with the temperature sensing bulb 4;
the valve core is provided with an upper limit position and a lower limit position, and the water outlet hole 15 is always communicated with the annular cavity 27 when the valve core is positioned between the upper limit position and the lower limit position; when the valve core is positioned at the upper limit position, the cold water hole 18 is completely communicated with the annular cavity 27, and when the valve core is positioned at the lower limit position, the hot water hole 17 is completely communicated with the annular cavity 27; the height of the annular cavity 27 is equal to the distance between the hot water hole 17 and the cold water hole 18;
an upper positioning ring 28 is arranged on the side wall of the inner cavity 11 at the upper limit position of the valve core, and a lower positioning ring 29 is arranged on the side wall of the inner cavity 11 at the lower limit position of the valve core; the valve core is in press fit with the upper positioning ring 28 when in the upper limit position and the lower positioning ring 29 when in the lower limit position.
The hot water hole 17 is connected with a hot water source 30 through a hot water pipe 19, the cold water hole 18 is connected with a cold water source 31 through a cold water pipe 20, a hot water valve 32 is arranged on the hot water pipe 19, a cold water valve 33 is arranged on the cold water pipe 20, and an expansion valve 34 is arranged on the expansion pipe 26; the side wall of the water jacket 3 is connected with a thermometer 35, the bottom of the water jacket 3 is connected with an emptying pipe 36, and the emptying pipe 36 is provided with an emptying valve 37.
The temperature sensing bulb 4 is connected with an adjusting pipe 38, the adjusting pipe 38 extends out of the constant temperature box 1 and is connected with an adjusting box 39, an adjusting valve 40 is arranged on the adjusting pipe 38, and the adjusting box 39 is higher than the temperature sensing bulb 4. The reason why the adjusting box 39 is lower than the thermal bulb 4 in fig. 1 is to clearly express the connection relationship, and the spatial position relationship between the adjusting box 39 and the thermal bulb 4 is not expressed here.
The arrangement of the regulating valve 40 can regulate the constant temperature value provided by the water bath system by controlling the opening degree of the regulating valve 40. When the set temperature of the water bath system needs to be reduced, the opening degree of the regulating valve 40 is reduced, so that when the temperature of the temperature sensing liquid in the temperature sensing bulb 4 is heated and then rises to the set temperature, more temperature sensing liquid enters the vertical through hole 24 of the fixed seat 23, the push rod 22 and the valve core are pushed to move upwards for a longer distance, and the valve core reaches the upper limit position earlier, which means that after the opening degree of the regulating valve 40 is reduced, the hot water hole 17 is closed at a lower temperature (compared with before the opening degree of the regulating valve 40 is reduced), the cold water hole 18 is communicated, so that cold water enters the water jacket 3 at a relatively lower temperature (compared with before the opening degree of the regulating valve 40 is reduced), and the set temperature value of the constant-temperature water bath system is reduced. Similarly, the set temperature value of the constant temperature water bath system can be increased after the opening degree of the regulating valve 40 is increased.
The inner wall of the water jacket 3 is connected with a horizontally arranged water distribution ring pipe 41, the water distribution ring pipe 41 is communicated with the water outlet pipe 16, and the surface of the water distribution ring pipe 41 is uniformly provided with a plurality of water distribution holes 42. This configuration enables hot or cold water to enter the water jacket 3 more uniformly, and the temperature in each part of the water jacket 3 becomes more uniform.
The hot water source 30 is a hot water pipeline or a hot water tank or a water heater; the cold water source 31 is a tap water pipeline or a cold water tank, and the expansion liquid 5 is mercury or ethanol. The mercury and the ethanol have larger expansion coefficients, and the volume of the mercury and the ethanol is changed greatly along with the change of temperature, so that the change of the production pressure enables the valve core to have relatively larger stroke.
The upper surface of the fixed seat 23 is provided with a sealing ring 43 around the push rod 22, so that the sealing performance at the position is enhanced.
The invention also discloses a mechanical constant temperature adjusting method using the water bath system for the chemical experiment, which comprises the following steps in sequence:
firstly, ensuring that the emptying valve 37 and the regulating valve 40 are in a closed state, and opening the expansion valve 34, the hot water valve 32 and the cold water valve 33; the open end of the overflow drain hose 8 is connected with a drain structure (such as a water channel, a drainage ditch, an indoor floor drain and the like); a support and an experimental apparatus are placed in the incubator 1.
At the moment, the temperature of the thermal bulb 4 is not increased, the volume of the expansion liquid 5 in the thermal bulb 4 is smaller, the valve core is positioned at the lower limit position, and hot water of the hot water source 30 enters the water jacket 3 through the temperature control valve 2, so that the temperature in the water jacket 3 and the temperature in the constant temperature box 1 is increased; when water enters the water jacket 3, the gas discharge pipe 9 discharges gas outwards;
after the temperature of the temperature sensing bulb 4 rises, the volume of the expansion liquid 5 expands, the volume increment of the expansion liquid 5 completely enters the vertical through hole 24 of the fixed seat 23, and the valve core is pushed by the push rod 22 to move upwards and compress the pressure spring 21; when the annular cavity 27 in the valve core moves upwards to a position between the cold water hole 18 and the hot water hole 17, the valve core is at a constant temperature position, the cold water hole 18 is not communicated with the hot water hole 17 and the water outlet hole 15, and an experiment can be carried out in the constant temperature box after the valve core reaches the constant temperature position;
under the constant temperature position, if the temperature at the temperature sensing bulb 4 is further increased, the volume increment of the expansion liquid 5 generated therewith pushes the push rod 22 and the valve core to move upwards so as to communicate the water outlet hole 15 and the cold water hole 18, the temperature in the water jacket 3 and the thermostat 1 is reduced after cold water enters the water jacket 3, so that the volume of the expansion liquid 5 is contracted, and the valve core moves downwards under the elasticity of the pressure spring 21 after the volume of the expansion liquid 5 is contracted until the valve core reaches the constant temperature position;
under the constant temperature position, if the temperature at the temperature sensing bulb 4 is further reduced, the volume of the expansion liquid 5 is reduced along with the reduction of the temperature, the valve core moves downwards under the elasticity of the pressure spring 21, so that the water outlet hole 15 and the hot water hole 17 are communicated, the temperature in the water jacket 3 and the temperature in the constant temperature box 1 are raised after hot water enters the water jacket 3, so that the volume of the expansion liquid 5 is expanded, and the expansion liquid 5 moves upwards through the valve core until the expansion liquid reaches the constant temperature position;
when the water level in the water jacket 3 is higher than the top end of the overflow pipe 6, the water in the water jacket 3 enters the overflow pipe 6 and flows out.
After the experiment is completed, all the hot water valve 32, the regulating valve 40, the cold water valve 33 and the expansion valve 34 are closed, the emptying valve 37 is opened, and the water in the water jacket 3 is emptied.
When the regulating valve 40 is in a closed state, the volume increment of the expansion liquid 5 completely enters the vertical through hole 24 of the fixed seat 23, and the temperature value corresponding to the constant temperature position of the valve core is the lowest constant temperature;
when the temperature corresponding to the constant temperature position of the valve core needs to be increased, the opening degree of the regulating valve 40 is increased, when the temperature is increased, one part of the volume increment of the expansion liquid 5 enters the vertical through hole 24 of the fixed seat 23, and the other part of the volume increment of the expansion liquid enters the regulating box 39, so that when the temperature at the temperature sensing bulb 4 reaches the lowest constant temperature, the expansion liquid 5 entering the vertical through hole 24 of the fixed seat 23 cannot push the valve core to the constant temperature position; when the core valve rises to the constant temperature position, the expansion liquid 5 in the thermal bulb 4 generates more volume increment compared with the expansion liquid 5 generated when the core valve reaches the constant temperature position under the closed state of the regulating valve 40, so that the temperature value corresponding to the constant temperature position of the core valve is increased;
when the regulating valve 40 is in a fully open state, the proportion of the volume increment of the expansion liquid 5 entering the vertical through hole 24 of the fixed seat 23 (i.e. the partial volume increment of the expansion liquid 5 entering the vertical through hole 24 of the fixed seat 23/the whole volume increment of the expansion liquid 5) is the lowest, and the temperature value corresponding to the constant temperature position of the valve core is the highest constant temperature;
when the temperature value corresponding to the constant temperature position of the valve core is higher than the lowest constant temperature and the temperature corresponding to the constant temperature position of the valve core needs to be reduced, the opening degree of the regulating valve 40 is reduced, the proportion of the volume increment of the expansion liquid 5 entering the vertical through hole 24 of the fixed seat 23 is increased, and when the valve core rises to the constant temperature position, the expansion liquid 5 in the temperature sensing bulb 4 generates less volume increment when the valve core reaches the constant temperature position before the opening degree of the regulating valve 40 is reduced, so that the temperature value corresponding to the constant temperature position of the valve core is reduced;
after increasing or decreasing the opening degree of the regulating valve 40, the operator observes a new constant temperature value of the temperature meter 35, and when the constant temperature value indicated by the temperature meter 35 is lower than the set temperature, the opening degree of the regulating valve 40 is increased; when the constant temperature value indicated by the temperature table 35 is higher than the set temperature, the opening degree of the regulating valve 40 is decreased, and the action of increasing or decreasing the opening degree of the regulating valve 40 is repeated until the constant temperature value indicated by the temperature table 35 is equal to the set temperature.
Wherein, the drainage structure is a sewer, an indoor floor drain or a drainage ditch or a municipal drainage pipe or a sewage tank.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention any modifications and equivalents.
Claims (5)
1. Water bath system for chemistry experiments, its characterized in that: the device comprises a constant temperature box and a temperature control valve, wherein a water jacket is arranged on the outer wall of the constant temperature box, a temperature sensing bulb is arranged at the bottom of the constant temperature box, and expansion liquid is contained in the temperature sensing bulb; an overflow pipe is arranged in the water jacket, the upper end of the overflow pipe is positioned at the top of the water jacket and is arranged in an open manner, the lower end of the overflow pipe is positioned at the bottom of the water jacket and is provided with a horizontal pipe section after being bent, and the horizontal pipe section extends out of the side wall of the water jacket; the outer end of the horizontal pipe section is connected with an overflow drainage hose; a water jacket above the overflow pipe is connected with an air release pipe;
the temperature control valve comprises a valve body, wherein a vertically arranged inner cavity is arranged in the valve body, the horizontal section of the inner cavity is circular, the side wall of the inner cavity is connected with a valve core in a sliding manner, the valve core comprises a top block, a bottom block and a connecting column connected between the top block and the bottom block, and the top block and the bottom block are respectively matched with the side wall of the inner cavity in a sliding and sealing manner; an annular cavity is defined by the top block, the bottom block, the connecting column and the side wall of the inner cavity; a water outlet is arranged in the valve body at one side, the inner end of the water outlet is communicated with the inner cavity of the valve body, and the outer end of the water outlet is connected with a water outlet pipe which is communicated with the water jacket; hot water holes and cold water holes are arranged in the valve body at the opposite side of the water outlet hole at intervals, the inner ends of the hot water holes and the cold water holes are communicated with the inner cavity of the valve body, the outer end of the hot water hole is connected with a hot water pipe, and the outer end of the cold water hole is connected with a cold water pipe; the hot water hole is lower than the cold water hole;
a pressure spring is connected between the top end of the top block and the top wall of the inner cavity of the valve body; a push rod is pressed downwards on the bottom block, the diameter of the upper part of the push rod is larger than that of the lower part of the push rod, the upper part of the push rod penetrates through the valve body and extends into the inner cavity of the valve body, the upper part of the push rod is in sliding sealing fit with the valve body, and the top end of the push rod is in pressing fit with the bottom block; a fixed seat is arranged below the valve body, a vertical through hole is formed in the fixed seat, and the lower part of the push rod extends downwards into the vertical through hole and is in sliding sealing fit with the wall of the vertical through hole; the lower end opening of the vertical through hole is connected with a connector, the connector is connected with an expansion pipe, and the expansion pipe extends into the constant temperature box and is communicated with the temperature sensing bulb;
the spool has an upper limit position and a lower limit position,
when the valve core is positioned between the upper limit position and the lower limit position, the water outlet hole is always communicated with the annular cavity; when the valve core is positioned at the upper limit position, the cold water hole is completely communicated with the annular cavity, and when the valve core is positioned at the lower limit position, the hot water hole is completely communicated with the annular cavity; the height of the annular cavity is equal to the distance between the hot water hole and the cold water hole;
an upper positioning ring is arranged on the side wall of the inner cavity at the upper limit position of the valve core, and a lower positioning ring is arranged on the side wall of the inner cavity at the lower limit position of the valve core;
the hot water hole is connected with a hot water source through a hot water pipe, the cold water hole is connected with a cold water source through a cold water pipe, a hot water valve is arranged on the hot water pipe, a cold water valve is arranged on the cold water pipe, and an expansion valve is arranged on the expansion pipe; the side wall of the water jacket is connected with a thermometer, the bottom of the water jacket is connected with an emptying pipe, and the emptying pipe is provided with an emptying valve.
2. The water bath system for chemical experiments according to claim 1, wherein: the temperature sensing bag is connected with the regulating pipe, and the regulating pipe stretches out the thermostated container and is connected with the regulating box, is equipped with the governing valve on the regulating pipe, and the regulating box is higher than the temperature sensing bag.
3. The water bath system for chemical experiments according to claim 1, wherein: the inner wall of the water jacket is connected with a horizontally arranged water distribution ring pipe, the water distribution ring pipe is communicated with a water outlet pipe, and the surface of the water distribution ring pipe is uniformly provided with a plurality of water distribution holes.
4. The water bath system for chemical experiments according to claim 1, wherein: the hot water source is a hot water pipeline or a hot water tank or a water heater; the cold water source is a tap water pipeline or a cold water tank, and the expansion liquid is mercury or ethanol.
5. The water bath system for chemical experiments according to claim 1, wherein: and a sealing ring is arranged on the upper surface of the fixed seat and surrounds the push rod.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710932008.5A CN107642622B (en) | 2017-10-10 | 2017-10-10 | Water bath system for chemistry experiments |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710932008.5A CN107642622B (en) | 2017-10-10 | 2017-10-10 | Water bath system for chemistry experiments |
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| CN107642622A CN107642622A (en) | 2018-01-30 |
| CN107642622B true CN107642622B (en) | 2023-04-07 |
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| CN107860065B (en) * | 2017-11-10 | 2023-10-24 | 西藏世峰高科能源技术有限公司 | Charging pile monitoring room air conditioning system |
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