A refrigeration and dehumidification system

Abstract

The present invention discloses a refrigeration and dehumidification system, comprising a fan, a compressor, a main evaporator, an evaporator / condenser, a main condenser, a three-way valve, a first one-way valve, a second one-way valve, a first throttling and pressure-reducing device, and an electric regulating valve. By providing an evaporator / condenser capable of switching between multiple operating modes, along with associated three-way valves, electric flow regulating valves, and pressure-reducing devices, the present invention enables a comprehensive range of dehumidification modes, including heating dehumidification, cooling dehumidification, and constant-temperature dehumidification with adjustable temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of gas processing, and in particular to a refrigeration and dehumidification system. Background Art

[0002] Refrigeration dehumidifiers can be divided into three types based on their functions: heating, constant temperature, and cooling. In actual use, dehumidifiers often need to switch between these three functions to ensure dehumidification while also controlling the temperature of the gas. To achieve the dehumidifier's control of the gas temperature, a common refrigeration dehumidification system design includes two condensers: one placed behind the evaporator to reheat the dehumidified gas, and the other external condenser as a single condenser. During operation, the two condensers are switched on as needed to achieve the heating and cooling dehumidification functions respectively. However, this type of dehumidifier does not have a constant temperature function, so the room temperature is difficult to stabilize and fluctuates greatly, affecting user experience. Summary of the Invention

[0003] The purpose of the present invention is to make up for the defects of the existing technology and provide a refrigeration and dehumidification system that can realize the switching operation of multiple dehumidification modes, including cooling dehumidification mode, heating dehumidification mode, and constant temperature dehumidification mode. The present invention sets an evaporator / condenser behind the main evaporator, wherein the evaporator / condenser can switch the working mode through a three-way valve, and can be switched to an evaporator and a condenser respectively. When the evaporator / condenser is switched to the evaporator, the refrigeration and dehumidification system operates in the cooling dehumidification mode. At this time, the evaporator / condenser and the main evaporator jointly play the role of the evaporator. The two evaporators work at the same time to produce more dehumidification. When the evaporator / condenser is switched to the condenser mode and the electric regulating valve on the main condenser inlet pipeline is in the closed state, since the main condenser is not operating at this time, the refrigeration and dehumidification system operates at this time. Switch to the heating and dehumidification mode; when the evaporator / condenser is switched to the condenser mode and the electric regulating valve on the main condenser inlet pipe is in the open state, since the main evaporator and the evaporator / condenser are in operation, the refrigeration and dehumidification system operates in a nearly constant temperature dehumidification mode. At this time, the refrigerant flow rate can be controlled by adjusting the exhaust electric regulating valve on the main condenser inlet pipe to adjust the heat dissipation distribution on the two condensers, so that the heat dissipation of the evaporator / condenser in the condenser mode matches the cooling capacity of the main evaporator until the inlet air temperature of this refrigeration and dehumidification system is the same as or close to the outlet air temperature.

[0004] The present invention is achieved through the following technical solutions:

[0005] A refrigeration and dehumidification system includes a fan, a compressor, a main evaporator, an evaporator / condenser, a main condenser, a three-way valve, a first one-way valve, a second one-way valve, a first throttling and pressure-reducing device and an electric regulating valve. The main evaporator and the evaporator / condenser are arranged in parallel, the fan is installed on the side of the evaporator / condenser, the evaporator / condenser is connected to the electric regulating valve and the first interface of the three-way valve in sequence through pipelines, the second interface and the third interface of the three-way valve are connected to the return air port and the exhaust port of the compressor respectively; the exhaust port of the compressor is connected to the main condenser, the outlet of the main condenser is connected to the inlet of the first throttling and pressure-reducing device, the outlet of the first throttling and pressure-reducing device is connected to the inlet of the first one-way valve and the second one-way valve respectively, the outlets of the first one-way valve and the second one-way valve are connected to the main evaporator and the evaporator / condenser respectively; the outlet of the main evaporator is connected to the return air port of the compressor

[0006] The function of the evaporator / condenser is switched between the evaporator and the condenser through the three-way valve and the electric regulating valve.

[0007] A connecting pipeline is provided between the outlets of the first one-way valve and the second one-way valve, and a second throttling and pressure-reducing device is provided on the connecting pipeline. The outlet and inlet of the second throttling and pressure-reducing device are respectively connected to the main evaporator and the evaporator / condenser.

[0008] An exhaust electric regulating valve is provided on the pipeline between the compressor and the main condenser.

[0009] Through the control of the evaporator / condenser, the three-way regulating valve and the electric regulating valve, the evaporator / condenser can be switched to a variety of operating modes, including evaporator mode, condenser mode and non-operating mode;

[0010] When the evaporator / condenser is in the evaporator operation mode, the present invention operates in the cooling and dehumidification mode, which is also equivalent to the air conditioning refrigeration mode, that is, the processed air flow is cooled and dehumidified.

[0011] When the evaporator / condenser operates in the non-operating mode, that is, the electric regulating valve connected to the three-way valve is in the closed state and the exhaust electric regulating valve in front of the main condenser is in the open state, it is also in the cooling and dehumidification mode, but the evaporator / condenser is in a non-circulating state due to the closed pipeline, and only the main evaporator is in the operating state. In this mode, since the evaporator area is smaller than the dual evaporator, the gas dew point temperature corresponding to the evaporator is lower, which is suitable for dehumidifying the airflow with lower relative humidity.

[0012] When the evaporator / condenser is in the condenser operation mode and the exhaust electric regulating valve in front of the main condenser is in the closed state, the refrigerant circulates between the main evaporator and the evaporator / condenser. Since the heat of the condenser in the refrigeration cycle is greater than the sensible heat cooling capacity of the evaporator, the present invention is in the heating and dehumidification mode.

[0013] When the evaporator / condenser is in the condenser operation mode and the exhaust electric regulating valve in front of the main condenser is in an adjustable open state, the refrigerant circulates between the main evaporator, the evaporator / condenser and the main condenser. The refrigerant flow through the main condenser is controlled by adjusting the exhaust electric regulating valve, and the compressor exhaust volume flowing through the evaporator / condenser in the condenser operation mode is also adjusted, thereby adjusting the heat dissipation of the evaporator / condenser as a condenser mode, thereby realizing constant temperature dehumidification with adjustable temperature.

[0014] In addition, when the working mode of the evaporator / condenser is switched from condenser mode to evaporator mode, the electric regulating valve connected to the three-way valve can be closed first, so that the evaporator / condenser is in a non-circulating state. At this time, the refrigerant in the evaporator / condenser will flow through the second throttling and pressure reducing device into the main evaporator until the refrigerant pressure in the evaporator / condenser is equal to or close to the refrigerant pressure in the main evaporator. At this time, the electric regulating valve connected to the three-way valve can be opened again, and the three-way valve can be switched to connect to the compressor suction port. Since the pressure in the evaporator / condenser has been reduced, switching the three-way valve at this time will not cause the refrigerant to rush to the compressor in large quantities due to the sudden switching of high pressure to low pressure, which may cause damage.

[0015] The present invention realizes the switching of multiple working modes of the refrigeration dehumidifier, including heating dehumidification, cooling dehumidification, and constant temperature dehumidification, by setting an evaporator / condenser and corresponding three-way valves, electric regulating valves, one-way valves, etc., which greatly improves the function of refrigeration dehumidification.

[0016] The advantages of the present invention are:

[0017] 1. This refrigeration and dehumidification system can fully realize multiple dehumidification modes, including heating dehumidification, cooling dehumidification, and constant temperature dehumidification.

[0018] 2. In the cooling and dehumidification mode, the present invention is equivalent to the refrigeration and air-conditioning mode, and the evaporation area can be adjusted in two levels. In this way, the sensible heat ratio of cooling and dehumidification can be adjusted to meet more user needs.

[0019] 3. The temperature is adjustable in constant temperature mode, and the temperature fluctuation is small.

[0020] 4. The switching between various dehumidification modes is smooth, and there is no need to stop the compressor when switching modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, a refrigeration and dehumidification system includes a fan 11, a compressor 1, a main evaporator 4, an evaporator / condenser 5, a main condenser 2, a first throttling and pressure reducing device 3, a second throttling and pressure reducing device 6, a three-way valve 7, a first one-way valve 9, a second one-way valve 10, an electric regulating valve 8, an exhaust electric regulating valve 12 and other components.

[0023] Driven by a blower 11, the processed gas flows sequentially through the main evaporator 4 and the evaporator / condenser 5. The evaporator / condenser 5 is connected to an electric regulating valve 8 and the first port 7a of a three-way valve 7 via pipelines. The second port 7b and the third port 7c of the three-way valve are connected to the return and exhaust ports of the compressor 1, respectively. The exhaust port of the compressor 1 is connected to the main condenser 2, and another electric exhaust regulating valve 12 is provided on the pipeline between the compressor 1 and the main condenser 2. The outlet of the main condenser 2 is connected to the inlet of a first throttling and pressure-reducing device 3, which is connected to the inlets of a first check valve 9 and a second check valve 10. The outlets of the two check valves are connected to the main evaporator 4 and the evaporator / condenser 5, respectively. A connecting pipeline is provided between the outlets of the two check valves, and a second throttling and pressure-reducing device 6 is provided on this connecting pipeline. The outlet and inlet of the second throttling and pressure-reducing device 6 are connected to the main evaporator 4 and the evaporator / condenser 5, respectively. The outlet of the main evaporator 4 is connected to the return port of the compressor 1.

[0024] The evaporator / condenser 5 switches between evaporator and condenser functions via the three-way valve 7 and an electrically controlled valve 8 connected to the three-way valve 7. When the solenoid valve 8 is open and the three-way valve 7 is connected in such a way that the first port 7a is connected to the second port 7b, the evaporator / condenser 5 and the electrically controlled valve 8 are connected to the return air port of the compressor 1 via the three-way valve 7. Since the evaporator / condenser 5 is connected to the return air port of the compressor 1, the evaporator / condenser 5 is in low-pressure evaporator mode. In this mode, since both evaporators operate together, the cooling area is larger, and the dehumidification capacity is greater than that of the main evaporator operating alone. Furthermore, if a lower evaporation temperature is desired, the electrically controlled valve 8 connected to the three-way valve 7 can be closed. In this mode, no refrigerant flows through the evaporator / condenser 5, rendering it in an inoperative state. Only the main evaporator 4 cools and dehumidifies the airflow, resulting in a lower evaporation temperature. Therefore, the design of the present invention allows the evaporation area and evaporation temperature to be adjusted as needed in the cooling mode. For example, when humidity is low, a lower evaporator dew point temperature is required for dehumidification.

[0025] When the three-way valve 7 and the electric regulating valve 8 connected to the three-way valve are in the open state and the three-way valve 7 is connected to the exhaust port of the compressor 1, the evaporator / condenser 5 operates as a condenser due to the connection with the exhaust gas of the compressor 1. If the electric exhaust regulating valve 12 in front of the main condenser 2 is closed, all the exhaust gas from the compressor 1 enters the evaporator / condenser 5, and the condensed liquid refrigerant then flows through the second throttling and pressure-reducing device 6 into the main evaporator 4 and then returns to the compressor 1. In this mode, since the heat dissipation of the condenser of the refrigeration system is greater than the cooling capacity of the evaporator, the refrigeration and dehumidification system is in the heating and dehumidification mode.

[0026] When the three-way valve 7 and the electric regulating valve 8 connected to the three-way valve are in the open state and the three-way valve 7 is connected to the exhaust port of the compressor 1, the working state of the evaporator / condenser 5 is a condenser due to the connection with the exhaust of the compressor 1. If the exhaust electric regulating valve 12 in front of the main condenser 2 is opened, part of the exhaust gas of the compressor 1 enters the evaporator / condenser 5. By adjusting the exhaust electric regulating valve 12 in front of the main condenser 2, the heat dissipation of the two condensers can be adjusted and distributed, so that the heat dissipation of the evaporator / condenser 5 in the condenser working mode matches the sensible heat cooling capacity of the main evaporator 4. Therefore, at this time, the refrigeration and dehumidification system is in a constant temperature dehumidification mode, and by adjusting the opening of the exhaust electric regulating valve 12, the temperature can be adjusted while dehumidifying.

[0027] In addition, when the working mode of the evaporator / condenser 5 is switched from the condenser mode to the evaporator mode, the electric regulating valve 8 connected to the three-way valve 7 can be closed first, so that the evaporator / condenser 5 is in a non-circulating state. At this time, the refrigerant in the evaporator / condenser will flow through the second throttling and pressure reducing device 6 into the main evaporator 4 until the refrigerant pressure in the evaporator / condenser 5 is equal to or close to the refrigerant pressure in the main evaporator 4. At this time, the electric regulating valve 8 connected to the three-way valve 7 can be opened again, and the three-way valve 7 can be switched to be connected to the compressor suction port. Since the pressure in the evaporator / condenser 5 has been reduced, switching the three-way valve 7 at this time will not cause damage to the compressor 1 caused by a large amount of refrigerant rushing to the compressor 1 due to the sudden switching of high pressure to low pressure.

[0028] The present invention can be used not only in refrigeration and dehumidification systems, but also in air-conditioning systems and other devices with the same structural form, using the same principle piping system, and is also protected by the rights of the present invention.

[0029] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A refrigeration and dehumidification system, characterized in that: The invention comprises a fan, a compressor, a main evaporator, an evaporator / condenser, a main condenser, a three-way valve, a first one-way valve, a second one-way valve, a first throttling and pressure-reducing device and an electric regulating valve. The main evaporator and the evaporator / condenser are arranged in parallel, the fan is installed on the side of the evaporator / condenser, the evaporator / condenser is connected to the electric regulating valve and the first interface of the three-way valve in sequence through a pipeline, the second interface and the third interface of the three-way valve are connected to the return air port and the exhaust port of the compressor respectively; the exhaust port of the compressor is connected to the main condenser, the outlet of the main condenser is connected to the inlet of the first throttling and pressure-reducing device, the outlet of the first throttling and pressure-reducing device is connected to the inlet of the first one-way valve and the second one-way valve respectively, the outlets of the first one-way valve and the second one-way valve are connected to the main evaporator and the evaporator / condenser respectively; the outlet of the main evaporator is connected to the return air port of the compressor; The function of the evaporator / condenser is switched between evaporator and condenser by means of the three-way valve and the electric regulating valve; A connecting pipeline is provided between the outlets of the first one-way valve and the second one-way valve, and a second throttling and pressure-reducing device is provided on the connecting pipeline, wherein the outlet and inlet of the second throttling and pressure-reducing device are respectively connected to the main evaporator and the evaporator / condenser; An exhaust electric regulating valve is provided on the pipeline between the compressor and the main condenser.

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