Constant-temperature and constant-humidity air conditioning system

Abstract

The utility model belongs to the technical field of cigarette production and discloses a constant-temperature and constant-humidity air conditioning system which comprises an air conditioning indoor unit, an air conditioning outdoor unit and a controller. An evaporator, a compressor, an electronic expansion valve and a first sensor are arranged in the air conditioner outdoor unit, the first sensor is arranged at an outlet of the evaporator and used for detecting the pressure of the outlet of the evaporator, the air conditioner outdoor unit is provided with an outdoor unit fan and a second sensor, and the outdoor unit fan is used for accelerating heat exchange between the outside and the evaporator. The second sensor is used for detecting outdoor temperature and humidity; the controller is electrically connected with the second sensor, the first sensor, the compressor, the outdoor unit fan and the electronic expansion valve. According to the constant-temperature and constant-humidity air conditioning system, stability of the temperature and humidity of the target area can be guaranteed, it can be guaranteed that the air conditioning system is in a non-frosting state, and huge fluctuation of the temperature and humidity of the target area caused by defrosting of the air conditioner outdoor unit is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to cigarette production technical field especially relates to a constant temperature and humidity air conditioning system. BACKGROUND

[0002] Constant temperature and humidity air conditioning is widely used in the laboratory of the cigarette production enterprise which has higher precision requirement on temperature and humidity. The control system directly determines the precision of temperature and humidity control of the cigarette laboratory. In the aspect of heating, the traditional constant temperature and humidity air conditioning of the cigarette laboratory mostly adopts the electric heating mode to ensure the control precision, but the electric heating consumes huge energy and has high use cost. Therefore, the constant temperature and humidity air conditioning generally adopts the heating mode of the heat pump air conditioner in winter and other specific conditions without the need of temperature reduction and dehumidification, but the outdoor unit is easy to frost in the heating process of the heat pump air conditioner, and the heating effect is greatly reduced after frosting. The traditional solution is to switch the four-way valve and switch the condenser and the evaporator to achieve the purpose of defrosting. However, this process will bring large temperature and humidity fluctuation, which is often unacceptable in the constant temperature and humidity air conditioning system with high precision control. SUMMARY

[0003] The utility model discloses a constant temperature and humidity air conditioning system to solve the problems in the background.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] A constant temperature and humidity air conditioning system comprises:

[0006] An air conditioner indoor unit is provided with a condenser;

[0007] An air conditioner outdoor unit is provided with an evaporator, a compressor, an electronic expansion valve and a first sensor. One end of the electronic expansion valve is connected with one end of the condenser, the other end of the electronic expansion valve is connected with the inlet of the evaporator, the outlet of the evaporator is connected with one end of the compressor, the other end of the compressor is connected with the other end of the condenser, the first sensor is arranged at the outlet of the evaporator, the first sensor is used for detecting the pressure of the evaporator outlet, the air conditioner outdoor unit is provided with an outdoor fan and a second sensor, the outdoor fan is used for accelerating heat exchange between the outside and the evaporator, and the second sensor is used for detecting outdoor temperature and humidity.

[0008] A controller is electrically connected with the second sensor, the first sensor, the compressor, the outdoor fan and the electronic expansion valve.

[0009] Optionally, the air conditioner indoor unit is further provided with an electric heating device, and the electric heating device is electrically connected with the controller.

[0010] Optionally, the indoor air conditioner is provided with an indoor fan.

[0011] Optionally, the first sensor is a pressure sensor.

[0012] Optionally, the second sensor is a temperature and humidity sensor.

[0013] Optionally, the electric heating device is a heating wire.

[0014] The present application has the following beneficial effects:

[0015] The constant temperature and humidity air conditioning system provided by the present application can ensure the stability of the target area temperature and humidity, and can ensure that the air conditioning system is in a non-frosting state, avoiding the great fluctuation of the target area temperature and humidity caused by defrosting of the outdoor air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present application and the drawings without creative labor.

[0017] Figure 1 is a structural schematic diagram of the constant temperature and humidity air conditioning system provided by the present application;

[0018] Figure 2 is a control principle diagram of the controller in the present application.

[0019] In the drawings:

[0020] 100, indoor air conditioner; 110, condenser; 120, electric heating device; 130, indoor fan; 200, outdoor air conditioner; 210, evaporator; 220, compressor; 230, electronic expansion valve; 240, first sensor; 250, outdoor fan; 260, second sensor; 300, controller. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all the structures.

[0022] In the description of the utility model, unless another definite provision and limit, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through the intermediate medium indirectly connect, can be two element internal communication or two element's interaction relationship.For the ordinary skilled in the art, can understand the specific meaning of the above-mentioned term in the utility model according to specific circumstances.

[0023] In the utility model, unless another definite provision and limit, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0024] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0025] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout the drawings.The embodiments described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as a limitation on the utility model.

[0026] As Figure 1 And Figure 2The utility model provides a constant temperature and humidity air conditioning system, including air conditioning outdoor unit 200, air conditioning indoor unit 100 and controller 300. Among them, the condenser 110 is arranged in air conditioning indoor unit 100, the evaporimeter 210, compressor 220, electronic expansion valve 230 and first sensor 240 are arranged in air conditioning outdoor unit 200, one end of electronic expansion valve 230 is connected with one end of condenser 110, the other end of electronic expansion valve 230 is connected with the import of evaporimeter 210, the export of evaporimeter 210 is connected with one end of compressor 220, the other end of compressor 220 is connected with the other end of condenser 110, and first sensor 240 is arranged at the export of evaporimeter 210, and first sensor 240 is used to detect the pressure of evaporimeter 210 export, and air conditioning outdoor unit 200 is provided with outdoor fan 250 and second sensor 260, and outdoor fan 250 is used to make the outside and evaporimeter 210 accelerate heat exchange, and second sensor 260 is used to detect outdoor temperature and humidity, and controller 300 is electrically connected with second sensor 260, first sensor 240, compressor 220, outdoor fan 250 and electronic expansion valve 230 respectively.

[0027] Specifically, the air conditioning indoor unit 100 is further provided with an electric heating device 120, and the electric heating device 120 is electrically connected with the controller 300. The air conditioning indoor unit 100 is provided with an indoor fan 130. The first sensor 240 is a pressure sensor. The second sensor 260 is a temperature and humidity sensor. The electric heating device 120 is a heating wire.

[0028] The refrigerant is pressed out by the compressor 220, at this time the refrigerant is high-temperature and high-pressure gas, the refrigerant passes through the condenser 110, the refrigerant releases heat, the temperature decreases and condenses into liquid, the refrigerant passes through the electronic expansion valve 230 again, the flow changes according to the control requirement, the refrigerant passes through the evaporimeter 210 again, the refrigerant absorbs heat in the air and evaporates into gas, at this time because the refrigerant absorbs a large amount of heat, the pressure in the coil of the air conditioning outdoor unit 200 is relatively low, and the temperature is also relatively low, if the corresponding outdoor temperature and humidity environment is encountered, the evaporimeter 210 is easy to frost, at this time the outlet pressure of the evaporimeter 210 needs to be controlled, and the heating load of the air conditioning unit is kept or appropriately reduced, so that the frost situation can be well avoided.

[0029] The controller 300 is configured to: when there is a heating demand, the controller 300 adjusts the compressor 220 frequency, the electronic expansion valve 230 opening degree and the outdoor unit fan 250 according to the load size; the controller 300 judges the difficulty of the frosting of the evaporator 210 according to the real-time outdoor temperature and humidity, so as to limit the minimum pressure at the outlet of the evaporator 210; when the outlet pressure of the evaporator 210 quickly approaches or is lower than the limited value, the compressor 220 no longer increases the frequency, and if the outdoor unit fan 250 does not run at full frequency at this time, the outdoor unit fan 250 also runs at a higher frequency; at this time, if the heating is not enough to meet the heating demand, the electric heating device 120 is started to supplement. The outlet pressure limit target of the evaporator 210 is corrected in real time according to the outdoor temperature and humidity. The electric heating device 120 is only put into operation when the outlet pressure of the evaporator 210 quickly approaches or is lower than the limited value, and the heating capacity is not enough.

[0030] Specifically, when there is a heating demand, the compressor 220 starts to run, the compressor 220 frequency is automatically adjusted according to the heating demand, and the opening degree of the electronic expansion valve 230 is adjusted according to multiple parameters at the same time, and the control object is mainly the superheat degree, and parameters such as the outlet temperature of the compressor 220 are also considered. The outdoor unit fan 250 is adjusted according to the heating load. The controller 300 judges the difficulty of the frosting of the evaporator 210 according to the real-time outdoor temperature and humidity, so as to calculate the minimum pressure limit value at the outlet of the evaporator 210. Generally, when the outdoor temperature is-15 DEG C to 6 DEG C and the relative humidity is high, the air conditioner outdoor unit 200 is easy to frost, the controller 300 implements the correction of the minimum pressure limit value at the outlet of the evaporator 210, and the change trend is that when the outdoor temperature is below 6 DEG C, the higher the temperature, the higher the pressure limit value, and the higher the relative humidity, the higher the pressure limit value. When the outlet pressure of the evaporator 210 is relatively stable and higher than the minimum limit value, the compressor 220 increases or decreases the frequency according to the heating demand, and the increase or decrease of the frequency has a certain time delay limit. When the outlet pressure of the evaporator 210 quickly approaches or is lower than the limit value, the compressor 220 no longer increases the frequency, and if the outdoor unit fan 250 does not run at full frequency at this time, the outdoor unit fan 250 also runs at a higher frequency to improve the heat exchange capacity. At this time, if the heating is not enough to meet the heating demand, the electric heating device 120 is started to supplement, the electric heating device 120 is pulse output, and the heating capacity is controlled by the time ratio of on-off.

[0031] The constant temperature and humidity air conditioning system can ensure the stability of the target area temperature and humidity, and ensure that the air conditioning system is in a non-frosting state, so that the great fluctuation of the target area temperature and humidity caused by defrosting of the air conditioner outdoor unit 200 is avoided.

[0032] The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the mature means in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the circuit connection adopts the conventional connection mode in the prior art, and the specific connection mode will not be described in detail here. The contents not described in detail in the specification all belong to the prior art known by the professional technical personnel in the field.

[0033] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A constant temperature and humidity air conditioning system, characterized in that, include: An indoor unit for air conditioning, wherein a condenser is installed inside the indoor unit for air conditioning; An outdoor unit for an air conditioner includes an evaporator, a compressor, an electronic expansion valve, and a first sensor. One end of the electronic expansion valve is connected to one end of the condenser, and the other end is connected to the inlet of the evaporator. The outlet of the evaporator is connected to one end of the compressor, and the other end of the compressor is connected to the other end of the condenser. The first sensor is located at the outlet of the evaporator and is used to detect the pressure at the outlet of the evaporator. The outdoor unit also includes an outdoor fan and a second sensor. The outdoor fan is used to accelerate heat exchange between the outside environment and the evaporator, and the second sensor is used to detect the outdoor temperature and humidity. The controller is electrically connected to the second sensor, the first sensor, the compressor, the outdoor fan, and the electronic expansion valve.

2. The constant temperature and humidity air conditioning system according to claim 1, characterized in that, The indoor unit of the air conditioner is also equipped with an electric heating device, which is electrically connected to the controller.

3. The constant temperature and humidity air conditioning system according to claim 1, characterized in that, The indoor unit of the air conditioner is equipped with an indoor fan.

4. The constant temperature and humidity air conditioning system according to claim 1, characterized in that, The first sensor is a pressure sensor.

5. The constant temperature and humidity air conditioning system according to claim 1, characterized in that, The second sensor is a temperature and humidity sensor.

6. The constant temperature and humidity air conditioning system according to claim 2, characterized in that, The electric heating device is a heating wire.

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