Temperature-controllable built-in waste heat recovery screw air compressor

Abstract

This utility model provides a temperature-controllable screw air compressor with built-in waste heat recovery, comprising: a screw air compressor and a waste heat recovery device built into the screw air compressor; the waste heat recovery device is equipped with a cooling water inlet, a cooling water outlet, an electrically controlled ball valve, an inlet oil temperature sensor, an outlet oil temperature sensor, and an outlet water temperature sensor; cooling water enters the waste heat recovery device through the cooling water inlet and the electrically controlled ball valve to exchange heat with the internal high-temperature lubricating oil, and the cooled low-temperature lubricating oil returns to the main unit of the screw air compressor through the lubricating oil outlet; the heated cooling water is discharged through the cooling water outlet. The above-mentioned temperature-controllable screw air compressor with built-in waste heat recovery controls the built-in waste heat recovery to ensure that the outlet water temperature meets the downstream water temperature requirements.

Description

Technical Field

[0001] This utility model relates to a temperature-controllable screw air compressor with built-in waste heat recovery. Background Technology

[0002] Screw air compressors are essential equipment in most industries. Their energy consumption has become a major concern for various organizations. While continuously improving the energy efficiency of compressed air systems, screw air compressors generate a significant amount of compression heat during operation. This heat consumption accounts for over 85% of the unit's operating power, and this energy is typically released into the atmosphere through the unit's air-cooling or water-cooling system. Therefore, heat recovery from screw air compressors is a necessary means to continuously reduce air system losses, improve customer productivity, lower energy costs, and achieve energy conservation and environmental protection goals.

[0003] Existing technologies, such as an air compressor with built-in waste heat recovery (CN201921884496.8), have the following disadvantages: This patent recovers the heat generated by compressed gas. When the air compressor is working, most of the heat is carried away by the lubricating oil, and the heat carried away by the gas is relatively small. Therefore, the economic efficiency of heat recovery from compressed gas is poor. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide a temperature-controllable screw air compressor with built-in waste heat recovery, which controls the built-in waste heat recovery to ensure that the temperature of the outlet water meets the requirements of the downstream water temperature.

[0005] To solve the above-mentioned technical problems, this utility model provides a temperature-controllable screw air compressor with built-in waste heat recovery, including: a screw air compressor and a waste heat recovery device built into the screw air compressor;

[0006] The waste heat recovery device is equipped with a cooling water inlet, a cooling water outlet, an electrically controlled ball valve, an oil inlet temperature sensor, an oil outlet temperature sensor, and an outlet water temperature sensor. Cooling water enters the waste heat recovery device through the cooling water inlet and the electrically controlled ball valve to exchange heat with the internal high-temperature lubricating oil. The cooled low-temperature lubricating oil returns to the main unit of the screw air compressor through the lubricating oil outlet. The heated cooling water is discharged through the cooling water outlet.

[0007] In a preferred embodiment: the screw air compressor includes an air filter, a main unit, an oil tank, an oil pump, a temperature control valve, and a lubricating oil inlet;

[0008] Air enters the main unit through an air filter and is compressed together with the lubricating oil. The oil-air mixture is separated by an oil tank. The separated high-temperature lubricating oil is pressurized by an oil pump and enters the waste heat recovery device through a temperature control valve and a lubricating oil inlet.

[0009] In a preferred embodiment: the waste heat recovery device is further provided with an oil inlet temperature sensor, an oil outlet temperature sensor, and an water outlet temperature sensor; used to monitor the inlet and outlet water and oil temperatures.

[0010] In a preferred embodiment: when the temperature detected by the oil inlet temperature sensor is lower than the set value, the electrically controlled ball valve is closed and the cooling water inlet is not supplied with water; when the temperature detected by the oil outlet temperature sensor is lower than the set value, the oil outlet temperature is adjusted by adjusting the opening degree of the electrically controlled ball valve.

[0011] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0012] This invention provides a temperature-controllable screw air compressor with built-in waste heat recovery. An inlet oil temperature sensor, an outlet oil temperature sensor, and an outlet water temperature sensor are installed before the waste heat recovery device to monitor the inlet and outlet water and oil temperatures. When the temperature detected by the inlet oil temperature sensor is lower than the set value, the electrically controlled ball valve will be directly closed, preventing water from flowing into the cooling water inlet and stopping heat exchange by the waste heat recovery device. When the temperature detected by the outlet oil temperature sensor is lower than the set value, the opening degree of the electrically controlled ball valve will be adjusted to regulate the outlet oil temperature. These two functions primarily prevent the oil temperature from becoming too low and affecting the compressor's compression. When the inlet and outlet oil temperatures meet the set values, the opening degree of the electrically controlled ball valve is adjusted by reading the temperature value from the outlet water temperature sensor to ensure the outlet water temperature meets the set value. This achieves control of the built-in waste heat recovery, ensuring the outlet water temperature meets the downstream water temperature requirements, making it more intelligent. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the air compressor in a preferred embodiment of the present invention;

[0014] Figure 2 This is a top view of the internal structure of the air compressor in a preferred embodiment of the present invention;

[0015] Figure 3 This is a perspective view of the internal structure of the air compressor in a preferred embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the waste heat recovery device in a preferred embodiment of the present invention. Detailed Implementation

[0017] To make the technical solution and features of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only for illustrating this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0018] refer to Figures 1-4 This embodiment provides a temperature-controllable screw air compressor with built-in waste heat recovery, including: a screw air compressor 15 and a waste heat recovery device 6 built into the screw air compressor 15;

[0019] The waste heat recovery device 6 is equipped with a cooling water inlet 9, a cooling water outlet 10, an electrically controlled ball valve 11, an oil inlet temperature sensor 12, an oil outlet temperature sensor 13, and an outlet water temperature sensor 14. Cooling water enters the waste heat recovery device 6 through the cooling water inlet 9 and the electrically controlled ball valve 11 to exchange heat with the internal high-temperature lubricating oil. The cooled low-temperature lubricating oil returns to the main unit 2 of the screw air compressor 15 through the lubricating oil outlet 8. The heated cooling water is discharged through the cooling water outlet 10.

[0020] During operation, the screw air compressor 15 is a device for compressing air. Air enters the main unit 2 through the air filter device 1 and is compressed together with lubricating oil. Most of the heat generated by the compression of the gas is absorbed by the lubricating oil. Oil-gas separation occurs through the oil tank 3. The separated high-temperature lubricating oil is pressurized by the oil pump 4, passes through the temperature control valve 5, and enters the waste heat recovery device 6 through the lubricating oil inlet 7. The waste heat recovery device 6 is equipped with a cooling water inlet 9, a cooling water outlet 10, an electrically controlled ball valve 11, an oil inlet temperature sensor 12, an oil outlet temperature sensor 13, and an outlet water temperature sensor 14. Cooling water enters the waste heat recovery device through the cooling water inlet 9 and the electrically controlled ball valve 11 to cool and exchange heat with the high-temperature lubricating oil inside. The cooled lubricating oil returns to the main unit 2 through the lubricating oil outlet 8 to re-compress and absorb heat from the air, forming a cycle to generate a continuous source of heat energy. The heated cooling water is discharged through the cooling water outlet 10.

[0021] The waste heat recovery device 6 is controlled by adjusting the opening and closing of the electrically controlled ball valve based on the temperature sensor set on the device, thereby changing the water flow rate and achieving temperature control as follows:

[0022] The inlet oil temperature sensor 12, outlet oil temperature sensor 13, and outlet water temperature sensor 14, installed before the waste heat recovery device 6, monitor the inlet and outlet water and oil temperatures. When the temperature detected by the inlet oil temperature sensor 12 is lower than the set value, the electrically controlled ball valve 11 will be directly closed. At this time, the cooling water inlet 9 will not flow, and the waste heat recovery device will not exchange heat. When the temperature detected by the outlet oil temperature sensor 13 is lower than the set value, the oil temperature at the outlet will be adjusted by adjusting the opening degree of the electrically controlled ball valve 11. The above two functions mainly prevent the oil temperature from being cooled too low and affecting the compression of the main unit 2. When the inlet oil temperature and outlet oil temperature meet the set values, the opening degree of the electrically controlled ball valve 11 will be adjusted by reading the temperature value of the outlet water temperature sensor 14 to make the outlet water temperature meet the set temperature value.

[0023] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A temperature-controllable screw air compressor with built-in waste heat recovery, characterized in that... include: Screw air compressor and waste heat recovery device built into screw air compressor; The waste heat recovery device is equipped with a cooling water inlet, a cooling water outlet, an electrically controlled ball valve, an oil inlet temperature sensor, an oil outlet temperature sensor, and an outlet water temperature sensor. Cooling water enters the waste heat recovery device through the cooling water inlet and the electrically controlled ball valve to exchange heat with the internal high-temperature lubricating oil. The cooled low-temperature lubricating oil returns to the main unit of the screw air compressor through the lubricating oil outlet. The heated cooling water is discharged through the cooling water outlet.

2. The temperature-controllable screw air compressor with built-in waste heat recovery according to claim 1, characterized in that: The screw air compressor includes an air filter, a main unit, an oil tank, an oil pump, a temperature control valve, and a lubricating oil inlet; Air enters the main unit through an air filter and is compressed together with the lubricating oil. The oil-air mixture is separated by an oil tank. The separated high-temperature lubricating oil is pressurized by an oil pump and enters the waste heat recovery device through a temperature control valve and a lubricating oil inlet.

3. The temperature-controllable screw air compressor with built-in waste heat recovery according to claim 1, characterized in that: The waste heat recovery device is also equipped with an oil inlet temperature sensor, an oil outlet temperature sensor, and an water outlet temperature sensor to monitor the inlet and outlet temperatures of water and oil.

4. A temperature-controllable screw air compressor with built-in waste heat recovery according to claim 3, characterized in that: When the temperature detected by the oil inlet temperature sensor is lower than the set value, the electric ball valve closes and the cooling water inlet is not supplied with water; when the temperature detected by the oil outlet temperature sensor is lower than the set value, the oil outlet temperature is adjusted by adjusting the opening degree of the electric ball valve.

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