Air-cooled industrial water chiller

Abstract

The utility model discloses an air -cooled industrial water chiller unit, which is sequentially connected with high pressure pressure sensor, condenser, liquid accumulator, filter, electronic expansion valve, evaporator on the compressor outlet, the outlet of evaporator returns the compressor inlet through gas -liquid separator and low pressure pressure sensor, electromagnetic valve II is arranged between the inlet of evaporator and the outlet of compressor bypass, and it is through the linkage control of high pressure pressure sensor and variable frequency fan, temperature sensor and electromagnetic valve I, and the heat transfer capacity of condenser is dynamically regulated, and the change of different high pressure pressure and environmental temperature is adapted, the linkage control of low pressure pressure sensor and electromagnetic valve II solves the problem of insufficient pressure on the low pressure side of system under low temperature environment, and double controller cooperates and works, realizes the double stability of high pressure pressure and low pressure pressure, and guarantees the reliable operation of unit all the year round.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration equipment technology, and in particular relates to an air-cooled industrial chiller unit that can operate stably under different ambient temperatures throughout the year. Background Technology

[0002] Existing air-cooled chiller units suffer from problems such as difficulty starting, frequent triggering of low-pressure protection, abnormal system differential pressure protection, and poor compressor oil return when operating in low-temperature environments (especially below 10°C), failing to meet year-round cooling demands (especially stable cooling when ambient temperatures are below -25°C). The traditional solution uses a "fan plus single-pressure switch" control mode, but this method has the following drawbacks: 1. Low accuracy: The single-pressure switch only adjusts pressure by simply starting and stopping the fan, resulting in a large response delay and inability to accurately maintain stable system pressure; 2. Poor adaptability: In low-temperature environments, the large temperature difference between the condenser and the environment causes a sudden drop in the low-pressure side of the system, preventing the compressor from starting normally; 3. Insufficient reliability: The single-pressure switch cannot dynamically adjust the condenser's heat exchange capacity, leading to large system fluctuations and making reliable year-round operation difficult.

[0003] Therefore, those skilled in the art urgently need an air-cooled industrial chiller unit that can dynamically adjust high and low pressure and adapt to a wide range of ambient temperatures. Utility Model Content

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an air-cooled industrial chiller unit. To solve the problems of unstable operation in low-temperature environments and low system pressure control accuracy in existing technologies, this air-cooled industrial chiller unit ensures stable operation of the unit throughout the year in an environment ranging from -40℃ to 43℃ through a dual pressure detection and dynamic adjustment mechanism on both the high-pressure and low-pressure sides.

[0005] To achieve the above technical objectives, the present invention adopts the following solution:

[0006] The specific technical solution adopted by this utility model is as follows: an air-cooled industrial chiller unit, including a compressor, a high-pressure sensor, a solenoid valve I, a controller I, a variable frequency fan, a condenser, a liquid receiver, a filter, an electronic expansion valve, a solenoid valve II, an evaporator, a controller II, a gas-liquid separator, a low-pressure sensor, and a temperature sensor.

[0007] The connection relationships of each component are as follows:

[0008] The compressor outlet is sequentially connected to a high-pressure sensor, a condenser, a liquid receiver, a filter, an electronic expansion valve, and an evaporator;

[0009] The outlet of the evaporator returns to the compressor inlet via a gas-liquid separator and a low-pressure sensor;

[0010] A solenoid valve II is installed as a bypass between the inlet of the evaporator and the outlet of the compressor.

[0011] The high-pressure sensor is connected to controller I via a signal. Controller I is used to adjust the speed of the variable frequency fan, and the speed adjustment range is 20% to 100% of the rated speed.

[0012] The temperature sensor is connected to controller I via a signal, and controller I is also used to control the opening and closing of solenoid valve I.

[0013] The low-pressure sensor is connected to controller II, which is used to control the opening and closing of solenoid valve II.

[0014] The condensers are multiple sets connected in parallel, and at least one set of condensers is equipped with a solenoid valve I at its inlet.

[0015] The solenoid valve I is a normally open solenoid valve that closes when the ambient temperature is below a certain set value.

[0016] The solenoid valve II is a normally closed solenoid valve, which only opens when the low-pressure sensor detects that the pressure is below a certain value.

[0017] The controller I and controller II communicate with each other via a communication module to coordinate the adjustment of the high-pressure side and the low-pressure side pressure, ensuring the overall stable operation of the system.

[0018] The working principle of this utility model is as follows:

[0019] High-pressure side control: When the high-pressure sensor detects that the high-pressure is within the 2-3 MPa range, controller I linearly adjusts the variable frequency fan speed to change the airflow; when the temperature sensor detects that the ambient temperature is below -25℃, controller I closes solenoid valve I, reducing the effective heat exchange area of ​​the condenser. This achieves the purpose of suppressing condensation and maintaining stable high-pressure.

[0020] Low-pressure side control: When the low-pressure sensor detects that the low-pressure is below 0.2MPa, the controller II opens the solenoid valve II to bypass the high-temperature and high-pressure gas discharged from the compressor to the evaporator inlet, thereby increasing the low-pressure side pressure of the system and maintaining it above 0.4MPa to ensure normal compressor start-up and smooth oil return.

[0021] The beneficial effects of this utility model are:

[0022] This utility model connects a high-pressure sensor, a condenser, a liquid receiver, a filter, an electronic expansion valve, and an evaporator sequentially to the compressor outlet; the evaporator outlet returns to the compressor inlet via a gas-liquid separator and a low-pressure sensor; a solenoid valve II is provided as a bypass between the evaporator inlet and the compressor outlet.

[0023] 1. It dynamically adjusts the condenser's heat exchange capacity through the linkage control of the high-pressure sensor and the variable frequency fan, and the temperature sensor and the solenoid valve I, adapting to different high-pressure and ambient temperature changes; 2. Through the linkage control of the low-pressure sensor and the solenoid valve II, it solves the problem of insufficient low-pressure side pressure in the system under low-temperature conditions; 3. The dual controllers work together to achieve dual stability of high-pressure and low-pressure, ensuring reliable operation of the unit throughout the year. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system structure of this utility model.

[0025] In the diagram: 1. Compressor, 2. High-pressure sensor, 3. Solenoid valve I, 4. Controller I, 5. Variable frequency fan, 6. Condenser, 7. Liquid receiver, 8. Filter, 9. Electronic expansion valve, 10. Solenoid valve II, 11. Evaporator, 12. Controller II, 13. Gas-liquid separator, 14. Low-pressure sensor, 15. Temperature sensor. Detailed Implementation

[0026] The present invention will be described in detail below through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. However, it should be noted that the specific embodiments described below do not limit the technical solution. Those skilled in the art can make further technical extensions under the guidance of the following technical solutions. The scope of protection of this patent application is determined by the claims.

[0027] Example 1: The connection relationship of each component is as follows:

[0028] A type of air-cooled industrial chiller unit, see Figure 1 The present invention comprises, in sequence, a compressor 1, a high-pressure sensor 2, a solenoid valve I 3, a controller I 4, a variable frequency fan 5, a condenser 6, a liquid receiver 7, a filter 8, an electronic expansion valve 9, a solenoid valve II 10, an evaporator 11, a controller II 12, a gas-liquid separator 13, a low-pressure sensor 14, and a temperature sensor 15.

[0029] The compressor 1 outlet is sequentially connected to a high-pressure sensor 2, a condenser 6, a liquid receiver 7, a filter 8, an electronic expansion valve 9, and an evaporator 11. The condenser 6 consists of two sets connected in parallel, with a solenoid valve I3 installed at the inlet of one set of condensers 6. The solenoid valve I3 is a normally open solenoid valve that closes when the ambient temperature is below -25°C.

[0030] The outlet of evaporator 11 returns to the inlet of compressor 1 via gas-liquid separator 13 and low-pressure sensor 14;

[0031] A solenoid valve II 10 is installed at the inlet of the evaporator 11 and the outlet of the compressor 1, bypassing the latter. The solenoid valve II 10 is a normally closed solenoid valve, opening only when the low-pressure sensor 14 detects a pressure below 0.2 MPa.

[0032] High pressure sensor 2 is connected to controller I4, which is used to adjust the speed of variable frequency fan 5.

[0033] Temperature sensor 15 is connected to controller I4, which is also used to control the opening and closing of solenoid valve I3.

[0034] The low-pressure sensor 14 is connected to the controller Ⅱ12, which is used to control the opening and closing of the solenoid valve Ⅱ10.

[0035] Example 2: Actual operating conditions are as follows:

[0036] Summer operation: Controller I4 keeps solenoid valve I3 open; variable frequency fan 5 runs at 100% speed; condenser 6 dissipates heat at full load.

[0037] Winter operation: When the ambient temperature drops and the high pressure sensor 2 detects that the high pressure is in the range of 2-3 MPa, the controller I4 linearly adjusts the speed of the variable frequency fan 5 to change the air volume; when the temperature sensor 15 detects that the ambient temperature is below -25℃, the controller I4 closes the solenoid valve I3, reduces the effective heat exchange area of ​​the condenser 6, suppresses the condensation capacity, and maintains the high pressure stability.

[0038] When the low-pressure sensor 14 detects that the low-pressure side is below 0.2 MPa, the controller II 12 opens the solenoid valve II 10, injecting the high-temperature gas discharged from the compressor 1 into the evaporator 11, thus stabilizing the low-pressure side pressure above 0.4 MPa and ensuring the normal operation of the compressor. Furthermore, during operation, the controller I 4 and controller II 12 interact via a communication module to coordinate and adjust the high-pressure and low-pressure sides, ensuring the overall stable operation of the system.

[0039] The above description is only a preferred embodiment of this utility model. It controls the air-cooled chiller unit to start sensitively and operate stably in low-temperature environments (especially below 10°C), and can meet the cooling needs throughout the year (especially stable cooling supply when the ambient temperature is below -25°C).

Claims

1. An air-cooled industrial chiller unit, characterized in that: Includes compressor, high pressure sensor, solenoid valve I, controller I, variable frequency fan, condenser, liquid receiver, filter, electronic expansion valve, solenoid valve II, evaporator, controller II, gas-liquid separator, low pressure sensor, and temperature sensor; The compressor outlet is sequentially connected to a high-pressure sensor, a condenser, a liquid receiver, a filter, an electronic expansion valve, and an evaporator; The outlet of the evaporator returns to the compressor inlet via a gas-liquid separator and a low-pressure sensor; A solenoid valve II is provided as a bypass between the inlet of the evaporator and the outlet of the compressor; The high-pressure sensor is connected to controller I via a signal. Controller I is used to adjust the speed of the variable frequency fan, and the speed adjustment range is 20% to 100% of the rated speed. The temperature sensor is connected to controller I via a signal, and controller I is also used to control the opening and closing of solenoid valve I. The low-pressure sensor is connected to controller II, which is used to control the opening and closing of solenoid valve II.

2. The air-cooled industrial chiller unit according to claim 1, characterized in that: The condensers are multiple sets connected in parallel, and at least one set of condensers is equipped with a solenoid valve I at its inlet.

3. The air-cooled industrial chiller unit according to claim 1, characterized in that: The solenoid valve I is a normally open solenoid valve that closes when the ambient temperature is below a certain set value.

4. The air-cooled industrial chiller unit according to claim 1, characterized in that: The solenoid valve II is a normally closed solenoid valve, which only opens when the low-pressure sensor detects that the pressure is below a certain value.

5. The air-cooled industrial chiller unit according to claim 1, characterized in that: The controller I and controller II communicate with each other via a communication module.

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