A cold energy adjustable structure

Abstract

The utility model provides a kind of cold energy regulation structure, it can realize long time uninterrupted cold energy regulation, ensure that refrigeration normal operation;It includes compressor, oil-gas separator, condenser, liquid accumulator, refrigeration unit, gas-liquid separator connected in turn, it further includes first solenoid valve, second solenoid valve and first throttling mechanism, one end of the first solenoid valve is connected between the oil-gas separator, condenser, one end of the second solenoid valve is connected at the outlet of the liquid accumulator, the other end of the second solenoid valve is connected with one end of the first throttling mechanism, the other end of the first throttling mechanism is connected with the other end of the first solenoid valve, the outlet of refrigeration unit is connected with the inlet of the gas-liquid separator after being connected.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning and refrigeration technology, specifically to a cooling capacity adjustable structure. Background Technology

[0002] In air conditioning systems, to regulate cooling capacity, the compressor frequency or the compressor's exhaust bypass is typically used to achieve energy regulation of cooling capacity, thereby achieving precise temperature control and allowing the compressor to run without stopping. However, both of these energy regulation methods have their own drawbacks: (1) When the compressor is adjusted by frequency, it cannot operate at low frequency for a long time due to the limitation of the minimum speed of the compressor, which makes it impossible to fully achieve 0-100% energy adjustment. Also, when adjusting the low cooling capacity, the compressor usually needs to be stopped because the cooling capacity is too large. However, the compressor needs a certain time interval before it can be turned on after it stops running. This means that the refrigeration system cannot be turned on and run continuously at any time. (2) The compressor achieves energy regulation by means of exhaust bypass. Although this energy regulation method can achieve 0-100% energy regulation, it is easy for the compressor to overheat, which will cause the compressor to be unable to perform exhaust bypass for a long time. It also cannot achieve continuous energy regulation for a long time to meet normal production operation.

[0003] Therefore, there is an urgent need to provide a cooling capacity regulation structure to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a cooling capacity adjustment structure that can achieve uninterrupted cooling capacity adjustment over a long period of time, ensuring normal operation of refrigeration.

[0005] This utility model adopts the following technical solution: a cooling capacity adjustable structure, which includes a compressor, an oil-gas separator, a condenser, a liquid receiver, a refrigeration unit, and a gas-liquid separator connected in sequence. It also includes a first solenoid valve, a second solenoid valve, and a first throttling mechanism. One end of the first solenoid valve is connected between the oil-gas separator and the condenser. One end of the second solenoid valve is connected to the outlet of the liquid receiver. The other end of the second solenoid valve is connected to one end of the first throttling mechanism. The other end of the first throttling mechanism, the other end of the first solenoid valve, and the outlet of the refrigeration unit are connected together and then connected to the inlet of the gas-liquid separator.

[0006] Furthermore, the compressor's exhaust port is connected to the oil-gas separator's inlet, the oil return port of the oil-gas separator is connected to the compressor's gas return port, the oil-gas separator's outlet is connected to the condenser's inlet and one end of the first solenoid valve, the condenser's outlet is connected to the liquid receiver's inlet, the liquid receiver's outlet is connected to one end of the second solenoid valve and the refrigeration unit's inlet, and the gas-liquid separator's outlet is connected to the compressor's gas return port; the condenser includes a condenser fan; Furthermore, the refrigeration unit includes several sets of evaporation throttling mechanisms connected in parallel. Each set of evaporation throttling mechanisms includes an evaporator, a second throttling mechanism, and a third solenoid valve. One end of each set of third solenoid valves is connected in parallel to the outlet of the liquid receiver. The other end of each third solenoid valve is connected to one end of the second throttling mechanism. The other end of the second throttling mechanism is connected to the inlet of the evaporator. The outlets of each set of evaporators are connected in parallel to the inlet of the gas-liquid separator. Furthermore, a first temperature sensor is installed on the pipe at the outlet of the evaporator, and the difference between the outlet temperature of the evaporator and the evaporation temperature of the evaporator is 3℃~5℃; Furthermore, a pressure sensor and a second temperature sensor are provided on both the exhaust pipe and the return pipe of the compressor; the pressure sensor, the first temperature sensor, the second temperature sensor, the first solenoid valve, the second solenoid valve, and the third solenoid valve are all connected to the PID controller.

[0007] The beneficial effects of this utility model are that, through the setting of a first solenoid valve, a second solenoid valve, and a first throttling mechanism, it can achieve two bypass paths. That is, after the compressor's exhaust enters the oil-gas separator, it outputs in two ways. It passes through the first solenoid valve and the gas-liquid separator into the compressor's return gas pipeline, thus achieving the first bypass path. The outlet of the liquid receiver passes through the second solenoid valve and the first throttling mechanism, and then converges with the first solenoid valve and the refrigeration unit into the gas-liquid separator, thus achieving the second bypass path. Through the first and second bypass paths, energy regulation and temperature control can be achieved, which can solve the requirements of the compressor's long-term and continuous refrigeration operation and energy regulation, and achieve 24-hour uninterrupted energy regulation and stable cooling output. Attached Figure Description

[0008] Figure 1 This is a connection diagram of this utility model. Detailed Implementation

[0009] like Figure 1As shown, this utility model discloses a cooling capacity adjustment structure, which includes a compressor 1, an oil-gas separator 2, a condenser 3, a liquid receiver 4, a refrigeration unit, and a gas-liquid separator 5 connected in sequence. The purpose of the oil-gas separator 2 is to separate the compressor 1 lubricating oil contained in the exhaust of the compressor 1 and return it to the return port of the compressor 1 to re-lubricate the compressor 1. It also includes a first solenoid valve 6, a second solenoid valve 7, and a first throttling mechanism 10. One end of the first solenoid valve 6 is connected between the oil-gas separator 2 and the condenser 3. One end of the second solenoid valve 7 is connected to the outlet of the liquid receiver 4. The other end of the second solenoid valve 7 is connected to one end of the first throttling mechanism 10. The other end of the first throttling mechanism 10, together with the other end of the first solenoid valve 6 and the outlet of the refrigeration unit, is connected to the inlet of the gas-liquid separator 5.

[0010] The exhaust port of compressor 1 is connected to the inlet of oil-gas separator 2. The oil return port of oil-gas separator 2 is connected to the return port of compressor 1. The outlet of oil-gas separator 2 is connected to the inlet of condenser 3 and one end of the first solenoid valve 6. The outlet of condenser 3 is connected to the inlet of liquid receiver 4. The outlet of liquid receiver 4 is connected to one end of the second solenoid valve 7 and the inlet of the refrigeration unit. The outlet of gas-liquid separator 5 is connected to the return port of compressor 1. Condenser 3 is equipped with condenser fan 8.

[0011] The refrigeration unit includes several sets of parallel-connected evaporation throttling mechanisms. Each set of evaporation throttling mechanisms includes an evaporator 12, a second throttling mechanism 11, and a third solenoid valve 9. One end of each set of third solenoid valves 9 is connected in parallel to the outlet of the liquid receiver 4, and the other end of the third solenoid valve 9 is connected to one end of the second throttling mechanism 11. The other end of the second throttling mechanism 11 is connected to the inlet of the evaporator 12, and the outlets of each set of evaporators 12 are connected in parallel to the inlet of the gas-liquid separator 5. When it is necessary to adjust the air conditioning cooling temperature, the second throttling mechanism 11 and the third solenoid valve 9 are usually automatically adjusted. The opening degree of the solenoid valve 9 is used to achieve precise temperature control. Furthermore, a first temperature sensor (not shown in the figure) is installed on the pipe at the outlet of the evaporator 12. The difference between the outlet temperature of the evaporator 12 and the evaporation temperature of the evaporator 12 is 3℃~5℃. The opening degree of the second throttling mechanism 11 is adjusted according to this difference. If the cooling capacity is too large even when the second throttling mechanism 11 is already opened to the minimum value and the air supply temperature of the evaporator 12 is still too low, the opening and closing time of the third solenoid valve 9 can be adjusted by the PID controller according to the temperature difference to achieve precise temperature control.

[0012] A pressure sensor (not shown in the figure) and a second temperature sensor (not shown in the figure) are installed on both the exhaust pipe and the return pipe of compressor 1; the pressure sensor, the first temperature sensor, the second temperature sensor, the first solenoid valve 6, the second solenoid valve 7, and the third solenoid valve 9 are all connected to the PID controller (not shown in the figure).

[0013] This invention enables 24-hour uninterrupted and stable cooling output, completely solving the long-term and constant cooling operation and energy adjustment requirements of compressor 1. Specifically, the exhaust gas from compressor 1 enters oil-gas separator 2. The outlet of oil-gas separator 2 is divided into two paths: one path enters condenser 3, and the other path passes through first solenoid valve 6 and then through gas-liquid separator 5 to enter the return gas pipeline of compressor 1, thus achieving the first bypass. Then, after being cooled by condenser 3 and condenser fan 8, the medium-temperature liquid refrigerant enters liquid receiver 4. After passing through liquid receiver 4, the liquid refrigerant is divided into two paths: one path enters the air conditioning terminal refrigeration unit (i.e., evaporator 12, second throttling mechanism 11, and third solenoid valve 9) to achieve cooling, and the other path passes through second solenoid valve 7 and first throttling mechanism 10 to form a second bypass. The second bypass converges with the outlet of air conditioning terminal refrigeration unit and the outlet of first solenoid valve 6 and enters gas-liquid separator 5, returning to compressor 1, thereby achieving energy adjustment and temperature control. The second bypass is equipped with a first throttling mechanism 10. When the medium-temperature liquid refrigerant passes through the first throttling mechanism 10, the temperature of the refrigerant can be effectively reduced. After merging with the exhaust gas at the outlet end of the evaporator 12 and the first bypass, they jointly control the return gas temperature of the compressor 1. In addition, when the refrigeration unit needs to operate at maximum load, all third solenoid valves 9 are opened and the corresponding second throttling mechanism 11 is adjusted, while the first solenoid valve 6 and the second solenoid valve 7 are closed, so that the compressor 1 can output the maximum amount of cooling capacity. When a portion of the refrigeration unit requires temperature control, the evaporation throttling mechanism can be partially disconnected via the third solenoid valve 9. Simultaneously, the first bypass can be adjusted based on the compressor 1's discharge pressure, discharge temperature, and return gas temperature. This allows for the calculation of the refrigerant's condensation temperature using existing methods and the pressure sensor's readings. If the refrigerant's condensation temperature is higher than the designed standard condensation temperature, while the compressor 1's discharge temperature is lower than the target discharge temperature, and there is no significant return gas superheat at the compressor 1's return gas end (return gas superheat is generally controlled at 3-5℃), then... The first bypass regulation is activated. If, after the first bypass regulation is activated, the return gas superheat is significantly excessive (exceeding 10-15℃), and the discharge temperature of compressor 1 is significantly higher than the target discharge temperature, the second bypass can be activated. The second bypass uses a PID controller to control the opening of the second solenoid valve 7 based on the difference between the return gas temperature and the discharge temperature and the target return gas temperature and discharge temperature. This allows the return gas temperature and discharge temperature of compressor 1 to drop to a reasonable temperature range, and allows excess refrigerant to return directly to the gas-liquid separator 5, thereby achieving one-way energy regulation. When the refrigeration unit needs to be completely shut down, the third solenoid valve 9 can be closed to disconnect all refrigerant supply to the refrigeration unit, thereby cutting off the cooling output at the end of the refrigeration unit. At this time, the energy output of the compressor 1 can be completely unloaded by opening the first bypass and the second bypass. At the same time, since the second bypass pipe is equipped with a second throttling mechanism 11, the refrigerant can be effectively cooled by the second throttling mechanism 11. The cooled refrigerant and the hot exhaust gas from the first bypass mix to achieve effective cooling. At the same time, the low-temperature refrigerant in the second bypass can also be effectively heated by the refrigerant in the first bypass, which can ensure that the superheat of the entire system is 3-5℃, preventing the refrigerant entering the compressor 1 from being too low and preventing the compressor 1 from liquid slugging due to low temperature. At the same time, the output of the liquid receiver 4 after the condenser 3 is branched, which can better store a large amount of refrigerant in the liquid receiver 4 when there is zero cooling output in the full bypass.

[0014] In summary, this utility model, through the first and second bypasses, allows the compressor 1 to maintain operation even when there is no load and all the terminals of the refrigeration unit are closed, enabling rapid start-up for refrigeration. This achieves 24-hour uninterrupted energy adjustment and stable cooling output, completely solving the problem of the compressor 1's long-term, on-demand refrigeration operation and energy adjustment requirements.

[0015] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0016] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cooling capacity adjustable structure, comprising a compressor, an oil-gas separator, a condenser, a liquid receiver, a refrigeration unit, and a gas-liquid separator connected in sequence, characterized in that: It also includes a first solenoid valve, a second solenoid valve, and a first throttling mechanism. One end of the first solenoid valve is connected between the oil-gas separator and the condenser. One end of the second solenoid valve is connected to the outlet of the liquid receiver. The other end of the second solenoid valve is connected to one end of the first throttling mechanism. The other end of the first throttling mechanism, together with the other end of the first solenoid valve and the outlet of the refrigeration unit, is connected to the inlet of the gas-liquid separator.

2. The cooling capacity adjustment structure according to claim 1, characterized in that: The compressor's exhaust port is connected to the oil-gas separator's inlet port, the oil return port of the oil-gas separator is connected to the compressor's gas return port, the oil-gas separator's outlet is connected to the condenser's inlet and one end of the first solenoid valve, the condenser's outlet is connected to the liquid receiver's inlet, the liquid receiver's outlet is connected to one end of the second solenoid valve and the refrigeration unit's inlet, and the gas-liquid separator's outlet is connected to the compressor's gas return port; the condenser is equipped with a condenser fan.

3. The cooling capacity regulating structure according to claim 1, characterized in that: The refrigeration unit includes several sets of parallel-connected evaporation throttling mechanisms. Each set of evaporation throttling mechanisms includes an evaporator, a second throttling mechanism, and a third solenoid valve. One end of each set of third solenoid valves is connected in parallel to the outlet of the liquid receiver. The other end of each third solenoid valve is connected to one end of the second throttling mechanism. The other end of the second throttling mechanism is connected to the inlet of the evaporator. The outlets of each set of evaporators are connected in parallel to the inlet of the gas-liquid separator.

4. The cooling capacity adjustment structure according to claim 3, characterized in that: A first temperature sensor is installed on the pipe at the outlet of the evaporator, and the difference between the outlet temperature of the evaporator and the evaporation temperature of the evaporator is 3℃~5℃.

5. The cooling capacity adjustment structure according to claim 4, characterized in that: A pressure sensor and a second temperature sensor are installed on both the exhaust pipe and the return pipe of the compressor; the pressure sensor, the first temperature sensor, the second temperature sensor, the first solenoid valve, the second solenoid valve, and the third solenoid valve are all connected to the PID controller.

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