CN216114388U - Constant temperature control system - Google Patents
Constant temperature control system Download PDFInfo
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- CN216114388U CN216114388U CN202122391454.4U CN202122391454U CN216114388U CN 216114388 U CN216114388 U CN 216114388U CN 202122391454 U CN202122391454 U CN 202122391454U CN 216114388 U CN216114388 U CN 216114388U
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Abstract
The application discloses constant temperature control system includes: each subsystem comprises a compressor, a four-way valve, a condenser and an evaporator, wherein the output end of the compressor is connected with the input end of the condenser through the four-way valve, the output end of the condenser is connected with the input end of the evaporator, and the output end of the evaporator is connected with the input end of the compressor through the four-way valve; and the evaporators of every two subsystems are connected to the same indoor unit, and the indoor units are connected with a controller. The constant temperature control system solves the problem that the set temperature in the existing refrigeration or heating system can not be accurately controlled, so that the set temperature and the actual temperature are greatly deviated, and the aim of accurately controlling the temperature is fulfilled.
Description
Technical Field
The utility model relates to the technical field of constant temperature control, in particular to a constant temperature control system suitable for a constant temperature and humidity machine.
Background
The constant temperature and humidity machine on the existing market generally adopts a single system to refrigerate or heat a use space, but the single system can only start up the whole refrigerating capacity or heating capacity to meet the requirement when refrigerating or heating, so that the set temperature can be quickly reached, and the power consumption is large. Wherein the allowable set temperature has a desired allowable deviation value. The refrigerating capacity or the heating capacity of the whole starting is larger, the relative quantity is also larger for the space, and the sensing delay of the temperature sensing probe of the controller can be caused, so that the actual temperature has large deviation from the required allowable deviation value under the normal condition; moreover, under the condition of large cold leakage or heat leakage, the actual temperature can also quickly exceed the required allowable deviation value, and at the moment, because the refrigerating or heating system is in the system time-limited protection time, the actual temperature is further far away from the required allowable deviation value, so that the set temperature cannot be accurately controlled.
SUMMERY OF THE UTILITY MODEL
Objects of the utility model
The utility model aims to provide a constant temperature control system, which solves the problem that the set temperature in the existing refrigeration or heating system cannot be accurately controlled, so that the set temperature is greatly deviated from the actual temperature, and achieves the aim of accurate temperature control.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions:
the constant temperature control system comprises at least two subsystems, wherein each subsystem comprises a compressor, a four-way valve, a condenser and an evaporator, the output end of the compressor is connected with the input end of the condenser through the four-way valve, the output end of the condenser is connected with the input end of the evaporator, and the output end of the evaporator is connected with the input end of the compressor through the four-way valve; and the evaporators of every two subsystems are connected to the same indoor unit, and the indoor units are connected with a controller.
Maintaining a constant temperature requires that the cold leakage and the refrigeration capacity are equal, or the heat leakage is equal to the heating capacity, which results in a stable temperature, wherein the heat leakage or the cold leakage is generally relatively small. According to the technical scheme, the constant temperature control system adopts the outdoor units of the double systems for refrigeration or heating, wherein each subsystem forms a compression type refrigeration system through a compressor, a four-way valve, a condenser and an evaporator, the outdoor units share one indoor unit through the two subsystems and are controlled by one controller, the refrigeration or heating effect of temperature reduction or speed increase can be achieved, and the purpose of accurately controlling the temperature can be achieved by only starting one subsystem to supplement cold leakage or heat leakage when the set temperature is reached.
In order to achieve the better invention purpose, the utility model also has the following technical characteristics:
in some embodiments, for the purpose of cross-controlling the four-way valve among the compressor, the condenser and the evaporator, each interface of the four-way valve is connected to a corresponding mechanism, specifically: the four-way valve is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the output end of the compressor, the second interface is connected with the input end of the condenser, the third interface is connected with the output end of the evaporator, and the fourth interface is connected with the input end of the compressor.
In some embodiments, the controller is electrically connected to a temperature sensor, the temperature sensor transmits a detected temperature signal to the controller, and the controller controls the single subsystem to be started or the two subsystems to be started simultaneously according to the temperature signal. From this, further realize the accurate control of indoor humiture through temperature sensor.
In some embodiments, a throttling element is connected between the evaporator and the condenser. The throttling element is arranged in a compression type refrigerating system with constant temperature and humidity, can reduce the pressure of high-pressure refrigerant liquid from a condenser into low-pressure low-temperature refrigerant, and enters an evaporator to evaporate and absorb heat, and has the function of automatically adjusting the flow.
In some embodiments, the throttling element is provided as a capillary tube or an electronic expansion valve or a thermal expansion valve. The capillary tube realizes the temperature regulation function by distributing, conveying and collecting the refrigerant; and the throttle elements of the electronic expansion valve and the thermostatic expansion valve have the function of automatically adjusting the flow of the refrigerant.
In some embodiments, there are two throttling elements. The two throttling elements are respectively matched with the two subsystems, so that each subsystem is provided with one throttling element to automatically adjust the flow of the refrigerant in the system, and the system has the advantages of simple structure, low cost, environmental friendliness and practicability.
In some embodiments, each of said subsystems is provided with one compressor, one said condenser and one said evaporator. Each subsystem is provided with an independent compressor, a condenser and an evaporator to form a complete compression type refrigerating system.
In some embodiments, when two of the subsystems are simultaneously activated, the first subsystem and the second subsystem are activated sequentially after a first period. Therefore, the subsystem started in advance is in fixed operation, so that the temperature rises slowly, the subsystem started in the later period can be ensured to avoid the requirement that the system needs enough stop time, the stability of the set temperature can be ensured under the condition of rapid temperature rise, and the allowable deviation value between the actual temperature and the set temperature is controlled more accurately.
Drawings
Fig. 1 is a schematic structural diagram of an outdoor unit according to an embodiment of the present invention;
fig. 2 is a block diagram of a thermostat control system according to an embodiment of the present invention.
Reference numerals:
1. a compressor; 2. a four-way valve; 3. a condenser; 4. an evaporator; 5. a throttling element; 6. an indoor unit; 7. a controller; 8. an outdoor unit; 9. a temperature sensor.
Detailed Description
The technical scheme and the beneficial effects of the utility model are clearer and clearer by further describing the specific embodiment of the utility model with the accompanying drawings of the specification.
Referring to fig. 1-2, a thermostat control system of the present embodiment includes: each subsystem comprises a compressor, a four-way valve, a condenser and an evaporator, wherein the output end of the compressor is connected with the input end of the condenser through the four-way valve, the output end of the condenser is connected with the input end of the evaporator, and the output end of the evaporator is connected with the input end of the compressor through the four-way valve; the evaporators of every two subsystems are connected to the same indoor unit, and the indoor units are connected with the controller. Therefore, the constant temperature control system adopts double systems for refrigeration or heating, and belongs to the temperature control application of a constant temperature and humidity machine. Each subsystem forms a compression type refrigerating system through a compressor, a four-way valve, a condenser and an evaporator, and then the two subsystems are matched to form multi-system control, so that different system numbers are started through actual cold leakage or heat leakage conditions to meet set temperature, and therefore smaller refrigerating capacity or heating capacity can be obtained through more stable and accurate cold supplement or heat supplement.
The constant temperature control system adopts the outdoor unit of the double systems for refrigeration or heating, the outdoor unit shares an indoor unit through the two subsystems and is controlled by a controller, and the outdoor unit can be independently and separately started to ensure the control accuracy under the condition of meeting the requirement of enough refrigeration or heating quantity through the two independent subsystems. Therefore, the constant temperature control system can achieve the effect of cooling or heating, and can achieve the purpose of accurate temperature control by only starting one subsystem to supplement cold leakage or heat leakage when reaching the set temperature.
As shown in fig. 1, in this embodiment, in order to make the four-way valve form cross control among the compressor, the condenser and the evaporator, each interface of the four-way valve is connected to a corresponding mechanism, specifically: the four-way valve is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the output end of the compressor, the second interface is connected with the input end of the condenser, the third interface is connected with the output end of the evaporator, and the fourth interface is connected with the input end of the compressor.
Preferably, in this embodiment, the controller electric connection has temperature sensor, and temperature sensor sets up and is used for real-time detection indoor humiture on indoor set, and temperature sensor transmits the temperature signal who detects for the controller, and the controller starts or two subsystems start simultaneously according to temperature signal control single subsystem. From this, further realize the accurate control of indoor humiture through temperature sensor.
As shown in fig. 1, in the present embodiment, a throttling element is connected between the evaporator and the condenser. The throttling element is arranged in a compression type refrigerating system with constant temperature and humidity, can reduce the pressure of high-pressure refrigerant liquid from a condenser into low-pressure low-temperature refrigerant, and enters an evaporator to evaporate and absorb heat, and has the function of automatically adjusting the flow.
Preferably, in this embodiment, the throttling element is provided as a capillary tube or an electronic expansion valve or a thermostatic expansion valve. The capillary tube realizes the temperature regulation function by distributing, conveying and collecting the refrigerant; and the throttle elements of the electronic expansion valve and the thermostatic expansion valve have the function of automatically adjusting the flow of the refrigerant.
As shown in fig. 1, in the present embodiment, two throttling elements are provided. The two throttling elements are respectively matched with the two subsystems, so that each subsystem is provided with one throttling element to automatically adjust the flow of the refrigerant in the system, and the system has the advantages of simple structure, low cost, environmental friendliness and practicability.
As shown in fig. 1, in the present embodiment, each subsystem is provided with one compressor, one condenser, and one evaporator. Each subsystem is provided with an independent compressor, a condenser and an evaporator to form a complete compression type refrigerating system.
Preferably, in this embodiment, when the two subsystems are started simultaneously, the first subsystem and the second subsystem are started sequentially after a first period. Therefore, the subsystem started in advance is in fixed operation, so that the temperature rises slowly, the subsystem started in the later period can be ensured to avoid the requirement that the system needs enough stop time, the stability of the set temperature can be ensured under the condition of rapid temperature rise, and the allowable deviation value between the actual temperature and the set temperature is controlled more accurately. Wherein the first period may be set to 20s-40 s, including 30s, 34 s.
The principle of the cooling operation between the two subsystems in the indoor unit is explained as follows:
1. when the set temperature and the actual temperature have large difference and need refrigeration, the two subsystems are started for refrigeration (the refrigeration speed is equal to that of a general large system with the same refrigeration capacity);
2. when the set temperature-allowable deviation value is reached; closing one subsystem and only leaving one subsystem to operate;
3. when the refrigerating capacity of the running single subsystem is equal to the refrigerating leakage capacity, the actual temperature is in a state of being constant at the set temperature;
4. when the refrigerating capacity of the single subsystem in operation is greater than the refrigerating leakage capacity, the operation is stopped when the set temperature is reached, and when the temperature rises back to the allowable deviation value, the other subsystem which is not operated last time is continuously started, so that the temperature can be slowly reduced to the set temperature; therefore, the system can be avoided meeting the requirement of the shutdown time, and the set temperature is ensured under the condition of quick temperature rise, so that a higher accurate allowable deviation value can be ensured;
5. when the refrigerating capacity of the running single subsystem is smaller than the refrigerating leakage capacity, the original system runs, so that the heating speed can be ensured to be slow, and when the heating reaches the allowable deviation value, the stopped subsystem is started to simultaneously run the two subsystems, so that the temperature can be reduced back to the set temperature. Thereby forming a state that one subsystem is fixedly operated and the other subsystem regulates the temperature. Because one subsystem is in fixed operation and the temperature rises slowly, the requirement of the other subsystem for enough stop time can be ensured, and thus a more accurate allowable deviation value is ensured; the operation of ensuring the temperature accuracy during heating is the same as the refrigeration principle, and the more accurate temperature control of the double systems is realized.
For example: the principle of operation of the refrigeration between the two compressors between the two subsystems is as follows:
wherein, setting: th- -Room ambient real-time temperature; ts- -set temperature; wk- -temperature control accuracy (settable at 0.2-10 ℃ C., default 0.5 ℃); we- -the second system start temperature difference (0-3 ℃ can be set, default 0.2 ℃), specifically:
when Ts is more than Th and less than or equal to Ts + Wk, starting a compressor;
when Th is more than Ts + Wk + We, starting two compressors; (when two compressors are required to be started simultaneously, one compressor is started first, and the second compressor is started 30 seconds later.)
When two compressors run simultaneously, one compressor is closed when Ts is more than Th and less than or equal to Ts + Wk, and only one compressor is kept to be started;
when Th is Ts, stopping the compressor;
when the two compressors reach the target value, the two compressors exit;
when Th is Ts + Wk, starting one compressor again;
when Th is more than Ts + Wk + We, starting two compressors;
therefore, when only one compressor is started, after the compressor a stops operating, and only one compressor needs to be started next time, the compressor a that was operated last time is not started, the compressor B that was not started last time is started, and after the compressor B reaches the stop operating condition, the condition that the compressor B needs to be started is reached, then the compressor B stops operating, and the compressor a is started (this function is the running-around function of the compressor).
If the compressor A (or B) continuously operates for 12 hours and the compressor B is in a stop state between 0 minutes and 5 hours 0 minutes in the early morning, starting the compressor B to operate for a first time period and then stopping the compressor A;
if the other compression is in the running state, the other compression is firstly run according to the required state, when the compressor B stops, the compressor B can be started when the starting condition of the compressor B is met, and the compressor A is stopped after the compressor B runs for a first time period; when one system fault causes the limitation of starting, the alternate break function is not performed.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A thermostatic control system, comprising:
the system comprises at least two subsystems, wherein each subsystem comprises a compressor, a four-way valve, a condenser and an evaporator, the output end of the compressor is connected with the input end of the condenser through the four-way valve, the output end of the condenser is connected with the input end of the evaporator, and the output end of the evaporator is connected with the input end of the compressor through the four-way valve; and the evaporators of every two subsystems are connected to the same indoor unit, and the indoor units are connected with a controller.
2. The thermostatic control system of claim 1, wherein: the four-way valve is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the output end of the compressor, the second interface is connected with the input end of the condenser, the third interface is connected with the output end of the evaporator, and the fourth interface is connected with the input end of the compressor.
3. The thermostatic control system of claim 1, wherein:
the controller is electrically connected with a temperature sensor, the temperature sensor transmits a detected temperature signal to the controller, and the controller controls the single subsystem to be started or the two subsystems to be started simultaneously according to the temperature signal.
4. The thermostatic control system of claim 1, wherein: and a throttling element is connected between the evaporator and the condenser.
5. The thermostatic control system of claim 4, wherein: the throttling element is set as a capillary tube or an electronic expansion valve or a thermal expansion valve.
6. The thermostatic control system of claim 4, wherein: the throttling element is provided with two.
7. The thermostatic control system of claim 1, wherein: each of the subsystems is provided with a compressor, a condenser and an evaporator.
8. The thermostatic control system of claim 1, wherein: when the same controller simultaneously starts the two subsystems, the two subsystems are started in sequence after a first period interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391454.4U CN216114388U (en) | 2021-09-29 | 2021-09-29 | Constant temperature control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122391454.4U CN216114388U (en) | 2021-09-29 | 2021-09-29 | Constant temperature control system |
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| CN216114388U true CN216114388U (en) | 2022-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167916A (en) * | 2023-10-12 | 2023-12-05 | 东莞市净诺环境科技股份有限公司 | Air conditioning system for thermostatic chamber and control method thereof |
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2021
- 2021-09-29 CN CN202122391454.4U patent/CN216114388U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117167916A (en) * | 2023-10-12 | 2023-12-05 | 东莞市净诺环境科技股份有限公司 | Air conditioning system for thermostatic chamber and control method thereof |
| CN117167916B (en) * | 2023-10-12 | 2024-04-26 | 东莞市净诺环境科技股份有限公司 | Air conditioning system for thermostatic chamber and control method thereof |
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