CN209744755U - Refrigerating system of constant temperature and humidity box and constant temperature and humidity box - Google Patents
Refrigerating system of constant temperature and humidity box and constant temperature and humidity box Download PDFInfo
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- CN209744755U CN209744755U CN201920206333.8U CN201920206333U CN209744755U CN 209744755 U CN209744755 U CN 209744755U CN 201920206333 U CN201920206333 U CN 201920206333U CN 209744755 U CN209744755 U CN 209744755U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model discloses a refrigerating system and constant temperature and humidity case of constant temperature and humidity case through using electronic expansion valve to replace traditional capillary or manual choke valve in refrigerating system, utilizes the changeable characteristics of electronic expansion valve aperture, and the refrigerant flow of a plurality of capillaries or manual choke valve in the virtual traditional constant temperature and humidity case refrigerating capacity control method that comes out, the opening value of direct input electronic expansion valve can control electronic expansion valve's aperture, changes the refrigerant flow among the refrigerating system. The control effect is equal to the effect of the traditional constant temperature and humidity box refrigeration system when the multi-path throttling elements are switched mutually. The utility model discloses a plurality of solenoid valves and throttling element can be practiced thrift to well constant temperature and humidity case's refrigerating system and constant temperature and humidity case, and circuit and refrigeration pipeline also very big simplification, and the refrigerating output is adjusted conveniently. The change rate of the refrigerating output is adjustable, the refrigerating output is slowly transited, and the interference fluctuation of the refrigerating output to the temperature and the humidity is greatly reduced when the linear temperature and the humidity change.
Description
Technical Field
The invention relates to a refrigeration system of a constant temperature and humidity box and the constant temperature and humidity box, and belongs to the technical field of refrigeration.
Background
For some precise instruments or parts, measurement or detection of some products with the same precision and harsh use requirements is often carried out in a constant temperature and humidity environment. Because the products with harsh use requirements are usually in a constant temperature and humidity environment when working, a constant temperature and humidity box can be used for simulating the environment, the products with harsh use requirements can be detected in the constant temperature and humidity box, the constant temperature and humidity box can be used for detecting the performance of the products or materials in various environments and testing the heat resistance, cold resistance, dry resistance and moisture resistance of various materials, and the constant temperature and humidity box is suitable for detecting the quality of products such as electronics, electric appliances, mobile phones, communication, instruments, vehicles, plastic products, metals, foods, chemicals, building materials, medical treatment, aerospace and the like. Therefore, temperature and humidity control is required to be carried out in the constant temperature and humidity box, so that the required constant temperature and humidity requirements are realized in the constant temperature and humidity box.
the constant temperature and humidity test chamber changes the temperature and humidity of the test chamber through refrigeration, dehumidification, heating and humidification. When different temperature and humidity conditions are set, heating, humidifying, refrigerating and dehumidifying need to be coordinated according to a certain output proportion, so that the testing requirements can be met. In daily use, the temperature and humidity span is large. The conditions usually used include 20 ℃ 50% RH, 40 ℃ 60% RH, 40 ℃ 90% RH, 60 ℃ 90% RH, 85 ℃ 85% RH, etc. Different proportions can be carried out on heating power, humidifying power, refrigerating capacity and dehumidifying capacity, and the test requirement is met. Heating and humidification are simple, the on-off power of the solid-state relay accounts for the control ratio, the heating pipe can output power of 0% -100%, but the scheme cannot be used for the refrigerating system, and the refrigerating compressor and the refrigerating system can achieve the purposes of refrigeration and dehumidification only by continuous and circular work. Therefore, the adjusting method of the refrigerating system becomes more complex, and different refrigerating capacities are needed to be used in different temperature and humidity intervals.
At present, two methods are generally adopted for cooling and refrigeration control in a constant temperature and humidity box: a refrigeration system adopting the method shown in figure 1 comprises a compressor 1, a fan 2 and an evaporator 3, wherein a plurality of capillary tubes 4 are arranged on a refrigerant circulating pipeline between the compressor 1 and the evaporator 3, the lengths of the capillary tubes 4 are generally 4, the 4 capillary tubes 4 are different, an electromagnetic valve is connected in series on each capillary tube 4, and different electromagnetic valves are opened according to measured actual temperature and humidity data and target temperature control values in a constant temperature and humidity box. For example, when the temperature in the box is-3 ℃ to 27 ℃, the electromagnetic valve YV1 is opened, and the refrigerant flows through the capillary tube 4 with the length of 1.2 meters; when the temperature in the refrigerator is 27-47 ℃, the electromagnetic valve YV1 is closed, the valve YV2 is opened, and the refrigerant flows through the capillary tube 4 with the length of 1.5 meters; when the temperature in the refrigerator is 47-67 ℃, the electromagnetic valve YV2 is closed, the valve YV3 is opened, and the refrigerant flows through the capillary tube 4 with the length of 2 meters; if the current temperature in the tank is 85 ℃ and the target temperature is 25 ℃, YV4 is opened and the refrigerant flows through the capillary tube 4 with a length of 0.8 m. The control method has the advantages of more electromagnetic valves and capillaries, high cost, complex system structure, high failure rate, difficult matching between the capillaries and refrigerant flow change and difficult realization of the selected capillaries to the required refrigerant flow. And the capillary tube is inconvenient to replace in the constant temperature and humidity box, and the capillary tube can be replaced only by discharging the refrigerant in the refrigerant circulating system, so the refrigeration control method has poor use effect.
another method for controlling cooling and refrigeration in a constant temperature and humidity chamber is a refrigeration system as shown in fig. 2, which includes a compressor 1, a fan 2, and an evaporator 3, wherein a plurality of refrigerant circulation pipelines are disposed on a refrigerant circulation pipeline between the compressor 1 and the evaporator 3, each pipeline corresponds to different refrigerant flow rates, each pipeline is respectively provided with an electromagnetic valve YV1/YV2/YV3/YV4 and a manual regulating valve 5, and different electromagnetic valves and corresponding manual regulating valves 5 are opened according to regulation requirements, so that the refrigerant flows through appropriate pipelines. The same fixed pipeline and the manual regulating valve are difficult to accurately control the flow of the refrigerant, the operation efficiency is low, an accurate control point is difficult to find, and the accurate control of refrigeration is difficult to realize. And the number of used electromagnetic valves and manual regulating valves is large, and the cost is high. And after the manual regulating valve is used for a long time, the spring in the valve body gradually loses elasticity, the performance of the manual regulating valve is reduced, and even the regulating function is lost.
Disclosure of Invention
The invention mainly solves the technical problem of providing a refrigeration control method of a constant temperature and humidity box, which can accurately control the refrigerant flow of a refrigeration system in the constant temperature and humidity box, thereby realizing the accurate regulation and control of the refrigeration system in the constant temperature and humidity box, meeting the regulation requirements of the constant temperature and humidity box on temperature and humidity and having low cost.
In order to solve the technical problems, the invention adopts the technical scheme that: the refrigeration system comprises a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, wherein the compressor, the condenser, the electronic expansion valve and the evaporator are arranged in series, the compressor is used as an initial end, the electronic expansion valve is arranged at the upstream of the evaporator, and the electronic expansion valve is electrically connected with the controller.
In a preferred embodiment of the present invention, a solenoid valve YV is disposed between the compressor and the electronic expansion valve.
In a preferred embodiment of the present invention, a fan is further included.
The invention also provides a constant temperature and humidity box adopting the refrigeration system, which comprises a box body, wherein a temperature and humidity measuring device, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller are arranged in the box body, the compressor, the electronic expansion valve and the evaporator are arranged in series, the compressor is taken as an initial end, the electronic expansion valve is arranged at the upstream of the evaporator, the temperature and humidity measuring device and the electronic expansion valve are respectively and electrically connected with the controller, a data input device is arranged on the box body, and the data input device is electrically connected with the controller. The temperature and humidity measuring device can adopt a temperature and humidity sensor, a temperature and humidity meter and the like.
In a preferred embodiment of the present invention, a solenoid valve is disposed between the compressor and the electronic expansion valve.
In a preferred embodiment of the present invention, a fan is disposed in the case.
In a preferred embodiment of the present invention, a display window is disposed on the box body.
The invention has the beneficial effects that: the refrigerating system of the constant temperature and humidity box can accurately control the flow of the refrigerant in the constant temperature and humidity box, and meets the requirements of the constant temperature and humidity box on temperature and humidity regulation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of a prior art refrigeration system for a constant temperature and humidity cabinet;
FIG. 2 is a schematic diagram of another prior art constant temperature and humidity cabinet refrigeration system;
FIG. 3 is a schematic diagram of the refrigeration system of the constant temperature and humidity box of the present invention;
Fig. 4 is a schematic structural view of the constant temperature and humidity chamber of the present invention.
The parts in the drawings are numbered as follows: 1. the system comprises a compressor, 2, a fan, 3, an evaporator, 4, a capillary tube, 5, a manual regulating valve, 6, an electronic expansion valve, 7, a pipeline, 8, a condenser, 9, a controller, 10, a temperature and humidity measuring device, 11, a box body, 12, a display window, 13 and a data input device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
referring to fig. 3 and 4, the refrigeration system of the constant temperature and humidity box includes a compressor 1, a condenser 8, an electronic expansion valve 6, an evaporator 3 and a controller 9, wherein the compressor 1, the condenser 8, the electronic expansion valve 6 and the evaporator 3 are arranged in series, the compressor 1 is used as a starting end, the electronic expansion valve 6 is arranged at the upstream of the evaporator 3, and the electronic expansion valve 6 is electrically connected with the controller 9.
Preferably, an electromagnetic valve YV is provided between the compressor 1 and the electronic expansion valve 6.
Preferably, the refrigeration system of the present invention further comprises a fan 2 for homogenizing the temperature and humidity in the tank.
The controller 9 controls the opening of the electronic expansion valve 6, thereby controlling the refrigerant flow in the refrigeration system, i.e. the refrigeration capacity.
The specific principle is as follows: the temperature and humidity measuring device in the constant temperature and humidity box transmits the measured temperature and humidity data to the controller, the set target temperature value is S, the current temperature value in the box measured by the temperature and humidity measuring device is PV,
a. When the measured current temperature value in the tank is that PV is more than-3 ℃ and less than or equal to SV1 ℃, SV1 is a temperature value, the controller controls and adjusts the opening degree of the electronic expansion valve to ensure that the opening degree of the electronic expansion valve is D1, and D1 is the ratio of the actual opening degree of the electronic expansion valve to the total opening degree of the electronic expansion valve under the temperature condition;
b. When the measured current temperature value SV1 ℃ is less than PV and less than or equal to SV2 ℃, SV2 is a temperature value, the controller controls and adjusts the opening degree of the electronic expansion valve to ensure that the opening degree of the electronic expansion valve is D2, and D2 is the ratio of the actual opening degree of the electronic expansion valve to the total opening degree of the electronic expansion valve under the temperature condition;
c. When the measured current temperature value SV2 ℃ is less than PV and less than or equal to SV3 ℃, SV3 is a temperature value, the controller controls and adjusts the opening degree of the electronic expansion valve to ensure that the opening degree of the electronic expansion valve is D3, and D3 is the ratio of the actual opening degree of the electronic expansion valve to the total opening degree of the electronic expansion valve under the temperature condition;
d. sequentially dividing temperature intervals according to the mode, wherein when the current temperature value SVn-1 ℃ measured at the nth time is more than PV and less than or equal to SVn ℃, SVn-1 and SVn are temperature values, and the controller controls and adjusts the opening degree of the electronic expansion valve to enable the opening degree of the electronic expansion valve to be Dn, wherein Dn is the ratio of the actual opening degree of the electronic expansion valve to the total opening degree of the electronic expansion valve under the temperature condition;
e. when the temperature of SVn is more than or equal to PV and less than or equal to 155 ℃ and PV-3 ℃ is more than S, the SVn is a temperature value and the SVn is less than 155 ℃, and the controller controls and adjusts the electronic expansion valve to be fully opened, so that the opening degree of the electronic expansion valve is the total opening degree, namely the ratio of the actual opening degree of the electronic expansion valve to the total opening degree of the electronic expansion valve is 100%.
A processor such as a PLC is provided in the controller 9, and can store the detected temperature, the target temperature and the opening instruction of the electronic expansion valve 6 in the constant temperature and humidity chamber in advance, a display window 12 and a data input device 13 are provided on the constant temperature and humidity chamber, the data input device 13 is electrically connected to the controller 9, the constant temperature and humidity chamber can display the detected temperature, an opening value is input through the data input device 13 according to the detected temperature in the chamber, and then the controller 9 controls the opening of the electronic expansion valve 6 according to the input data, so that the refrigerant flow passing through the pipeline 7 and the evaporator 3 can reduce the temperature in the constant temperature and humidity chamber to the target temperature.
For example, when S is 25 ℃ and SV1=27, the input D1 is 70% in a constant temperature and humidity box with a specification, so that the control purpose can be achieved; when S is 25 ℃ and SV2=47, the input D2 is 50%, so that the control purpose can be achieved; when S is 25 ℃ and SV3=67, the input D3 is 30%, and the control purpose can be achieved.
According to the specification of the constant temperature and humidity box, corresponding data among the detected temperature, the target temperature and the opening degree value of the electronic expansion valve in the constant temperature and humidity box are measured in advance and stored in the controller, so that the opening degree value is only required to be input into the data input device of the constant temperature and humidity box, the controller controls the opening degree of the electronic expansion valve according to the input data, and the temperature in the constant temperature and humidity box can be reduced to the target temperature through the flow of the refrigerant flowing through the pipeline 7 and the evaporator 3. The refrigerant flow in the refrigerating system can be adjusted only by using one electronic expansion valve and a common pipeline or adding one electromagnetic valve, and the refrigerating system can be controlled in multiple stages, only the opening value of the electronic expansion valve needs to be input, different opening values are input on the data input device and correspond to different working currents of the electronic expansion valve, different opening values are input on the data input device, then the controller controls different working currents of the electronic expansion valve, and therefore the opening size of the electronic expansion valve is controlled, the refrigerant flow passing through the electronic expansion valve can be controlled, and the refrigerating capacity is controlled. Therefore, a plurality of capillary tubes and manual regulating valves can be saved, and the cost of the constant temperature and humidity box is greatly saved. Aiming at different target temperature requirements of the constant temperature and humidity box, the capillary tube does not need to be replaced as the traditional control method, and the use is very convenient.
The refrigerant flow of a plurality of capillary tubes or manual pressure regulating valves in the traditional refrigeration capacity control method is virtualized by utilizing the characteristic that the flow of the electronic expansion valve is variable. For example, for a constant temperature and humidity box of one specification, when S is 25 ℃, SV1=27, the input D1 is 70%, that is, the opening of the electronic expansion valve is 70%, and the flow rate of the refrigerant flowing through the electronic expansion valve is equivalent to the flow rate of the refrigerant flowing through the capillary tube with the length of 1.2 meters opened by the electromagnetic valve YV 1; when S is 25 ℃ and SV2=47, the input D2 is 50%, namely the opening of the electronic expansion valve is 50%, the flow rate of the refrigerant flowing through the electronic expansion valve is equivalent to the flow rate of the refrigerant flowing through a capillary tube with the length of 1.5 meters when the electromagnetic valve YV1 is closed and the YV2 is opened; when the temperature of S is 25 ℃ and SV3=67, the input D3 is 30%, namely the opening of the electronic expansion valve is 30%, the flow of the refrigerant flowing through the electronic expansion valve is equivalent to the flow of the refrigerant flowing through a capillary tube with the length of 2 meters when the electromagnetic valve YV2 is closed and the YV3 is opened; when the temperature is higher than 67 ℃ and lower than or equal to 155 ℃ and PV-3 ℃ is higher than S, the electronic expansion valve is fully opened, namely the opening degree of the electronic expansion valve is 100 percent, and the flow of the refrigerant flowing through the electronic expansion valve is equivalent to the flow of the refrigerant flowing through the largest capillary tube opened by the electromagnetic valve YV 4.
The refrigeration system of the constant temperature and humidity box has the following advantages:
1. compared with a refrigeration system in the traditional control method, the refrigeration system can save a plurality of electromagnetic valves, capillary tubes and manual pressure regulating valves, and the cost of the constant temperature and humidity box is greatly reduced.
2. After the number of the electromagnetic valves is reduced, circuits and refrigeration pipelines are greatly simplified, the probability of failure of a refrigeration system is reduced, if one of the electromagnetic valves leaks in the original control scheme, the refrigerating capacity of a machine is increased, the cold and heat consumption is serious, the dehumidification capacity is increased, and the high temperature cannot reach a set value. The electronic expansion valve is used, so that the problem of leakage of the electromagnetic valve can be avoided.
2. the refrigerating capacity of each control condition can be directly modified through the controller, a refrigerating system does not need to be changed, for example, a capillary tube does not need to be replaced, and debugging is very convenient and rapid.
3. The electronic expansion valve does not have a spring for intermediate transmission, so that the reliability is high, and the refrigerant flow cannot change due to the change of the spring in the manual regulating valve.
4. In more and more experiments, the temperature needs to be linearly increased or linearly decreased, if the original electromagnetic valve switching mode is adopted, the temperature and the humidity in the constant temperature and humidity box can be severely fluctuated when two valves are switched and handed over, the electronic expansion valve is used, the controller can control the speed of the electronic expansion valve from one opening to the other opening, different opening values of the electronic expansion valve are input in a multi-time gradient mode, the quantity of refrigerant flowing into an evaporator is slowly changed, the severe fluctuation of the temperature and the humidity in the constant temperature and humidity test box is well avoided when a product is tested, the test is closer to the required environmental conditions, the test result is more real, and the refrigeration control is accurate and convenient.
The invention also provides a constant temperature and humidity box adopting the refrigeration system, as shown in fig. 4, the constant temperature and humidity box comprises a box body 11, a temperature and humidity measuring device 10, a compressor 1, a condenser 8, an electronic expansion valve 6, an evaporator 3 and a controller 9 are arranged in the box body 11, the compressor 1, the electronic expansion valve 6 and the evaporator 3 are arranged in series, the compressor 1 is taken as a starting end, the electronic expansion valve 6 is arranged at the upstream of the evaporator 3, the temperature and humidity measuring device 10 and the electronic expansion valve 6 are respectively and electrically connected with the controller 9, a data input device 13 is arranged on the box body 11, and the data input device 13 is electrically connected with the controller 9. The temperature and humidity measuring device 10 may be a temperature and humidity sensor, a temperature and humidity meter, or the like.
preferably, an electromagnetic valve YV is provided between the compressor 1 and the electronic expansion valve 6. The solenoid valve YV is used to prevent the refrigerant from leaking from the condenser 8 to the evaporator 3 due to the loss of control of the electronic expansion valve 6 after a sudden power failure, which increases the system start load and shortens the service life of the compressor.
a fan 2 is arranged in the box body 11 and used for homogenizing the temperature and humidity in the box.
Preferably, a display window 12 is disposed on the box body 11. The display window 12 may display the detected temperature inside the cabinet 11.
the temperature and humidity measuring device 10 detects the actual temperature in the box body 11 and transmits the temperature value to the controller 9, an operator inputs the opening degree value of the electronic expansion valve 6 on the data input device 13 according to the detected temperature and the target temperature and transmits the opening degree value of the electronic expansion valve 6 to the controller 9, the controller 9 controls the working current of the electronic expansion valve 6 to open the valve of the electronic expansion valve 6 to the required opening degree, and the flow of the refrigerant flowing through the electronic expansion valve 6, the pipeline 7 and the evaporator 3 is controlled, namely the refrigerating capacity is controlled.
The constant temperature and humidity box can accurately control the refrigerating capacity of the constant temperature and humidity box with low cost.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The refrigerating system of the constant temperature and humidity box is characterized by comprising a compressor, a condenser, an electronic expansion valve, an evaporator and a controller, wherein the compressor, the condenser, the electronic expansion valve and the evaporator are arranged in series, the compressor is used as an initial end, the electronic expansion valve is arranged at the upstream of the evaporator, and the electronic expansion valve is electrically connected with the controller.
2. The refrigerant system as set forth in claim 1, wherein a solenoid valve is disposed between said compressor and said electronic expansion valve.
3. The refrigerant system as set forth in claim 1, further including a fan.
4. The constant temperature and humidity box of the refrigerating system of claim 1, comprising a box body, wherein a temperature and humidity measuring device, a compressor, a condenser, an electronic expansion valve, an evaporator and a controller are arranged in the box body, the compressor, the electronic expansion valve and the evaporator are arranged in series, the compressor is used as a starting end, the electronic expansion valve is arranged at the upstream of the evaporator, the temperature and humidity measuring device and the electronic expansion valve are respectively and electrically connected with the controller, a data input device is arranged on the box body, and the data input device is electrically connected with the controller.
5. The constant temperature and humidity cabinet as claimed in claim 4, wherein a solenoid valve is disposed between the compressor and the electronic expansion valve.
6. The constant temperature and humidity cabinet as claimed in claim 4, wherein a fan is provided in the cabinet.
7. The constant temperature and humidity cabinet as claimed in claim 4, wherein a display window is provided on the cabinet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920206333.8U CN209744755U (en) | 2019-02-18 | 2019-02-18 | Refrigerating system of constant temperature and humidity box and constant temperature and humidity box |
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| CN201920206333.8U CN209744755U (en) | 2019-02-18 | 2019-02-18 | Refrigerating system of constant temperature and humidity box and constant temperature and humidity box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275343A (en) * | 2020-11-09 | 2021-01-29 | 宁波江南仪器厂 | Improved constant-temperature and constant-humidity climate test box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275343A (en) * | 2020-11-09 | 2021-01-29 | 宁波江南仪器厂 | Improved constant-temperature and constant-humidity climate test box |
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