Laboratory constant-temperature and constant-humidity air conditioning system

Abstract

The utility model relates to a laboratory constant-temperature and constant-humidity air conditioning system which comprises more than two stages of compression refrigeration systems, every more than two stages of compression refrigeration systems form a group of systems, and condensers of the more than two stages of compression refrigeration systems of the same group of systems share heat exchange fins. The evaporators of the more than two stages of compression refrigeration systems of the same group of system correspond to each other in the air inlet direction and the air outlet direction; at least two sets of systems are arranged, and evaporators of the two sets of systems are correspondingly crossed. An electric heater is arranged in front of and / or behind the evaporator which is not closest to the air outlet side, and a temperature sensor and a temperature and humidity sensor are arranged in front of and / or behind the evaporator. More than two stages of compression refrigeration systems are paired into a group of systems, evaporators of the compression refrigeration systems of the same group of systems correspond to each other, and the evaporators of more than two stages are subjected to graded gradient detection and control temperature feedback by a plurality of temperature and humidity sensors under the monitoring action of a condensing pressure sensor and the adjusting action of an evaporation pressure adjusting valve. And high-precision constant-temperature control of air supply is ensured.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, specifically a laboratory constant temperature and humidity air conditioning system. Background Technology

[0002] With the development of air conditioning technology, the requirements for air conditioning in some special occasions, such as laboratories, are becoming increasingly higher. Conventional laboratory air conditioners are single-system cooling systems. Even with variable frequency control technology, they maintain low-frequency operation when the temperature is close to the set value. For laboratories with high requirements for constant temperature and humidity accuracy, relying solely on compressor variable frequency is subject to changes in the laboratory environment, such as changes in ambient temperature, temperature monitoring, and ventilation volume. It is difficult to guarantee the accuracy and stability of constant temperature cooling power output. Summary of the Invention

[0003] This invention provides a laboratory constant temperature and humidity air conditioning system with a simple structure that can ensure high precision and stable constant temperature output.

[0004] The technical solution adopted by this utility model is: a laboratory constant temperature and humidity air conditioning system, including a two-stage or higher compression refrigeration system, characterized in that: the compression refrigeration system includes a compressor, a condenser, a condensing pressure sensor, a liquid storage tank, a filter, an expansion valve, an evaporator, and an evaporating pressure regulating valve; the compressor exhaust gas is sequentially routed through the condenser, condensing pressure sensor, liquid storage tank, filter, expansion valve, evaporator, and evaporating pressure regulating valve back to the compressor; a corresponding condensing fan is provided for the condenser; the condensers of the two-stage or higher compression refrigeration system share heat exchange fins; the evaporators of the two-stage or higher compression refrigeration system are aligned in the inlet and outlet air directions; an electric heater is provided before and / or after the evaporator of the two-stage or higher compression refrigeration system that is not closest to the outlet air side; and a temperature sensor and a temperature and humidity sensor are provided before and / or after the evaporator of the two-stage or higher compression refrigeration system.

[0005] A laboratory constant temperature and humidity air conditioning system includes a two-stage or higher compression refrigeration system, characterized in that: the compression refrigeration system includes a compressor, a condenser, a condensing pressure sensor, a liquid receiver, a filter, an expansion valve, an evaporator, and an evaporating pressure regulating valve; the compressor exhaust gas flows sequentially through the condenser, condensing pressure sensor, liquid receiver, filter, expansion valve, evaporator, and evaporating pressure regulating valve back to the compressor; a condenser fan is correspondingly installed on the condenser; each two-stage or higher compression refrigeration system constitutes a system group; the condensers of the two-stage or higher compression refrigeration systems in the same group share heat exchange fins; the evaporators of the two-stage or higher compression refrigeration systems in the same group correspond in the inlet and outlet airflow directions; at least two groups of systems are provided, with the evaporators of the two groups correspondingly and overlapping; an electric heater is installed before and / or after the evaporator that is not closest to the outlet airflow side; a temperature sensor and a temperature and humidity sensor are installed before and / or after the evaporator.

[0006] The compressor outlet is connected to the condenser via a needle valve with an ear, a vibration-damping hose, an integrated pressure switch, and a check valve; the evaporator pressure regulating valve is connected back to the compressor via a vibration-damping hose and a needle valve with an ear.

[0007] A bypass pipeline branches off from the condenser, and the bypass pipeline connects to the expansion valve and the evaporator in sequence via a solenoid valve and a shut-off valve.

[0008] The condenser is a parallel flow condenser.

[0009] A spray humidification structure is provided in front of the electric heater.

[0010] The compressors of the two-stage or higher compression refrigeration system are linked.

[0011] The compressor is a variable frequency compressor.

[0012] This invention employs two or more stages of compression refrigeration systems paired together as a single system. Evaporators within the same system correspond to each other, and electric heaters, temperature sensors, and temperature and humidity sensors are installed before and after each evaporator. Under the monitoring of condensing pressure sensors and the regulation of evaporating pressure valves, multiple temperature and humidity sensors detect and provide feedback on the temperature through graded gradient detection. This facilitates high-precision constant temperature control of the air supply from the outermost evaporator. In addition to the temperature and humidity sensors, a separate temperature sensor further ensures the accuracy of temperature monitoring. By using two or more systems and staggering the evaporators, multiple systems can be used for backup, switching, and maintenance. Furthermore, different cooling capacities can be allocated across the compression refrigeration systems containing multiple evaporators for control, further enhancing the high-precision constant temperature control of the final air supply. Electric heaters are installed on non-outermost sides, combined with a pre-spray humidification structure, ensuring humidity control while maintaining temperature, meeting the constant humidity requirements of the laboratory. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Compressor; 2. Valve with ear; 3. Vibration-damping hose; 4. Integrated pressure switch; 5. Check valve; 6. Bypass line; 7. Solenoid valve; 8. Shut-off valve; 9. Condenser fan; 10. Condenser pressure sensor; 11. Liquid receiver; 12. Filter; 13. Electronic expansion valve; 14. Temperature sensor; 15. Evaporator; 16. Evaporation pressure regulating valve; 17. Spray humidification structure; 18. Electric heater; 19. Temperature sensor; 20. Temperature and humidity sensor; 21. Detailed Implementation

[0015] The following explanation, in conjunction with the accompanying drawings, will provide further details.

[0016] Figure 1The embodiment shown includes a laboratory constant temperature and humidity air conditioning system, comprising a four-stage compression refrigeration system. Each two compression refrigeration systems form a group of systems. The compression refrigeration system uses compressor 1 to discharge gas sequentially through a valve with an earpiece 2, a vibration-damping hose 3, an integrated pressure switch 4, a check valve 5, a condenser 9, a condensing fan 10, a condensing pressure sensor 11, a liquid receiver 12, a filter 13, an electronic expansion valve 14, an evaporator 16, an evaporating pressure regulating valve 17, a vibration-damping hose, and a valve with an earpiece to return the gas to the compressor. The temperature sensing bulb 15 of the electronic expansion valve 14 is connected between the evaporator 16 and the evaporating pressure regulating valve 17. A bypass line 6 branches off after the check valve 5. The bypass line 6 is connected between the expansion valve and the evaporator via a solenoid valve 7 and a shut-off valve 8. The condensers of two or more compression refrigeration systems in the same group share heat exchange fins. The evaporators of two or more compression refrigeration systems in the same group correspond in the air inlet and outlet directions. The evaporators of the two groups are staggered and corresponding. Temperature sensors 20 are installed in front of and behind each evaporator. Temperature and humidity sensors 21 are also installed on the outer side of the innermost and outermost evaporators. An electric heater 19 and a spray humidification structure 18 are installed on the outer side of the innermost evaporator in sequence.

[0017] Based on this embodiment, the temperature sensor and humidity sensor can be arbitrarily changed or added before or after the evaporator. Multi-point monitoring can ensure monitoring accuracy and facilitate high-precision constant temperature control.

Claims

1. A laboratory air conditioning system comprising a two-stage or more compression refrigeration system, characterized in that: The compression refrigeration system comprises a compressor, a condenser, a condensing pressure sensor, a liquid tank, a filter, an expansion valve, an evaporator and an evaporating pressure regulating valve, the compressor exhaust is connected to the condenser, the condensing pressure sensor, the liquid tank, the filter, the expansion valve, the evaporator and the evaporating pressure regulating valve in sequence, and the compressor gas return is connected to the compressor, the condenser is provided with a condensing fan, the condensers of the two-stage or more compression refrigeration systems share heat exchange fins, the evaporators of the two-stage or more compression refrigeration systems correspond in the air inlet and outlet directions, an electric heater is arranged in front of and / or behind the evaporator which is not closest to the air outlet side of the two-stage or more compression refrigeration systems, and temperature sensors and temperature and humidity sensors are arranged in front of and / or behind the evaporators of the two-stage or more compression refrigeration systems.

2. A laboratory air conditioning system comprising a two-stage or more compression refrigeration system, characterized in that: The compression refrigeration system comprises a compressor, a condenser, a condensing pressure sensor, a liquid tank, a filter, an expansion valve, an evaporator and an evaporating pressure regulating valve, the compressor exhaust is connected to the condenser, the condensing pressure sensor, the liquid tank, the filter, the expansion valve, the evaporator and the evaporating pressure regulating valve in sequence, and the compressor gas return is connected to the compressor, the condenser is provided with a condensing fan; each two-stage or more compression refrigeration system is a group of systems, the condensers of the two-stage or more compression refrigeration systems of the same group of systems share heat exchange fins, and the evaporators of the two-stage or more compression refrigeration systems of the same group of systems correspond in the air inlet and outlet directions; at least two groups of systems are provided, the evaporators of the two groups of systems correspond and cross, an electric heater is arranged in front of and / or behind the evaporator which is not closest to the air outlet side, and temperature sensors and temperature and humidity sensors are arranged in front of and / or behind the evaporators.

3. The laboratory constant temperature and humidity air conditioning system according to claim 1 or 2, characterized in that: The compressor is connected to the condenser through an ear needle valve, a shock absorbing hose, an integrated pressure switch and a check valve.

4. The laboratory constant temperature and humidity air conditioning system according to claim 3, characterized in that: A bypass pipeline is branched off in front of the condenser, and the bypass pipeline is connected to the expansion valve and the evaporator through an electromagnetic valve and a stop valve in sequence.

5. The laboratory constant temperature and humidity air conditioning system according to claim 1 or 2, characterized in that: The condenser is a parallel flow condenser.

6. The laboratory constant temperature and humidity air conditioning system according to claim 1 or 2, characterized in that: A spray humidification structure is arranged in front of the electric heater.

7. The laboratory constant temperature and humidity air conditioning system according to claim 1 or 2, characterized in that: The compressors of the two-stage or more compression refrigeration systems are linked.

8. The laboratory constant temperature and humidity air conditioning system according to claim 7, characterized in that: The compressor is a variable frequency compressor.

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