Waste heat heating system and waste heat heating method based on air compressor

Abstract

The present invention discloses a waste heat heating system and method based on an air compressor, belonging to the technical field of waste heat utilization of air compressors. It comprises an air compressor, a cooling oil circuit assembly is connected between the air compressor and the heat exchanger, and the cooling oil circuit assembly is used to transfer the waste heat generated by the air compressor to the heat exchanger and form a circulation; a first circulation pump assembly is connected between the heat exchanger and the circulating water tank, and the first circulation pump assembly is used to transfer the heat generated by the air compressor absorbed by the heat exchanger to the circulating water tank and form a circulation; a second circulation pump assembly is connected between the circulating water tank and the water air conditioning unit, and the second circulation pump assembly is used to transfer the heat in the circulating water tank to the water air conditioning unit and form a circulation, and the water air conditioning unit dissipates heat to the room for heating. The waste heat of the air compressor can be recycled and utilized, which can not only cool the air compressor but also provide hot water heating for the workshop, thereby realizing the repeated recycling of energy and saving energy and being environmentally friendly.

Description

Technical Field

[0001] The present invention relates to a waste heat heating system and a waste heat heating method based on an air compressor, belonging to the technical field of waste heat utilization of air compressors. Background Art

[0002] An air compressor is a device that mechanically compresses ambient air, reducing its volume and increasing its pressure. Air compressors are widely used in industries such as industry, construction, and healthcare. During operation, air compressors generate a significant amount of waste heat. This waste heat is typically handled by connecting the compressor's cooling oil circuit to a radiator, where it is absorbed and then circulated through the oil circuit and discharged by a fan. However, if waste heat generated by factory air compressors, especially large ones, is not utilized, it not only wastes energy but also has adverse environmental impacts. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a waste heat heating system and a waste heat heating method based on an air compressor, which can recycle the waste heat of the air compressor. It can not only cool the air compressor, but also provide hot water heating for the workshop, thereby realizing the repeated recycling of energy and saving energy and protecting the environment.

[0004] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] A waste heat heating system based on an air compressor, comprising: an air compressor, a cooling oil circuit assembly, a heat exchanger, a first circulating pump assembly, a circulating water tank, a second circulating pump assembly and a water conditioning unit;

[0006] A cooling oil circuit assembly is connected between the air compressor and the heat exchanger, and the cooling oil circuit assembly is used to transfer waste heat generated by the air compressor to the heat exchanger to form a circulation;

[0007] A first circulating pump assembly is connected between the heat exchanger and the circulating water tank, and the first circulating pump assembly is used to transfer the heat generated by the air compressor absorbed by the heat exchanger to the circulating water tank to form a circulation;

[0008] A second circulating pump assembly is connected between the circulating water tank and the water air conditioning unit. The second circulating pump assembly is used to transfer the heat in the circulating water tank to the water air conditioning unit to form a circulation, and the water air conditioning unit dissipates heat to the room for heating.

[0009] As a preferred example, an air conditioning system is further provided between the water conditioning unit and the air compressor, and the air conditioning system is used to guide the indoor air to the air inlet of the air compressor;

[0010] The air conditioning system includes a controller, an air delivery device, an air duct, a temperature sensor and a pressure sensor;

[0011] The air outlet of the air delivery device is connected to the air inlet of the air compressor through an air duct, and the air inlet of the air delivery device is connected to the room through an air duct, and a temperature sensor and a pressure sensor are respectively provided in the air duct;

[0012] The gas delivery device includes any one of a blower and an air pump.

[0013] As a preferred example, the air compressor includes a drive motor, a compressor rotor or impeller, a compressor head and an air storage tank;

[0014] The drive motor serves as a power source for driving the compressor rotor or impeller to rotate;

[0015] The compressor head is provided with a rotor or impeller inside, and the air is compressed and output pressure is provided through the movement of the rotor or impeller;

[0016] The gas storage tank is used to store compressed gas;

[0017] The air compressor also includes a lubrication assembly, which includes a lubricating oil pump, a frequency converter, a lubricating oil tank and an oil pipeline. The two ends of the oil pipeline are respectively connected to the lubricating oil pump and the lubricating oil tank. The frequency converter is electrically connected to the lubricating oil pump. The oil outlet end of the lubricating oil pump is connected to the compressor head for providing lubricating oil to the compressor head.

[0018] As a preferred example, the cooling oil circuit assembly includes a cooling oil pump, a first coupling, a second frequency converter, a cooling oil tank and a cooling oil pipeline;

[0019] The two ends of the cooling oil tank are respectively connected to the cooling oil pump and the heat exchanger through cooling oil pipelines;

[0020] The rated power of the cooling oil pump motor is equal to or greater than the rated power of the lubricating oil pump motor. The motor shaft of the cooling oil pump is connected to the motor shaft of the lubricating oil pump through a first coupling, and the motor shaft of the lubricating oil pump is driven by the motor shaft of the cooling oil pump.

[0021] The second frequency converter is electrically connected to the first frequency converter. The first frequency converter is used to control the motor speed of the lubricating oil pump, and the second frequency converter is used to control the motor speed of the cooling oil pump.

[0022] As a preferred embodiment, the air compressor further includes a control frequency converter, which is electrically connected to the drive motor of the air compressor and is used to control the frequency of the drive motor;

[0023] The first circulating pump assembly includes a circulating water pump, a second coupling, a third frequency converter and a circulating water pipeline, and both ends of the circulating water pump are connected to a circulating water tank and a heat exchanger respectively through the circulating water pipeline;

[0024] The rated power of the driving motor of the air compressor is equal to or greater than the rated power of the motor of the circulating water pump, and the motor shaft of the circulating water pump is connected to the driving motor shaft of the air compressor through a second coupling, and the motor shaft of the circulating water pump is driven by the driving motor shaft of the air compressor;

[0025] The frequency converter 3 is electrically connected to the control frequency converter;

[0026] The control frequency converter is electrically connected to the driving motor of the air compressor and is used to control its frequency. The frequency converter 3 is used to control the motor speed of the circulating water pump.

[0027] As a preferred example, the waste heat heating system also includes a water temperature detection mechanism, which includes temperature sensor 2. The temperature sensor 2 is used to detect the temperature of the circulating water tank. When the temperature in the circulating water tank is lower than the preset temperature, the temperature sensor 2 transmits a temperature signal to the internal controller of the indoor air conditioner or heater, and the internal controller controls the operation of the air conditioner or heater.

[0028] As a preferred example, the waste heat heating system also includes a temperature monitoring mechanism, which includes a temperature sensor three, and the temperature sensor three is electrically connected to the inverter one and the inverter two. The temperature sensor three is used to monitor the compressor head temperature of the air compressor. When the temperature of the compressor head exceeds the preset temperature, the temperature sensor transmits a temperature signal to the inverter one and the inverter two. The inverter one and the inverter two accelerate the circulation speed of the lubricating oil and the cooling oil by controlling the electrode rotation frequency of the lubricating oil pump and the cooling oil pump.

[0029] As a preferred example, the second circulation pump assembly includes a hot water circulation pump and multiple hot water pipes. The water inlet end of the hot water circulation pump is connected to the circulating water tank through a hot water pipe, and the water outlet end is connected to multiple water air conditioners of the water air conditioner group through multiple hot water pipes.

[0030] A method for heating a room using the waste heat generated by the air compressor using the waste heat heating system based on the air compressor, the method comprising:

[0031] The cooling oil circuit component transfers the waste heat generated by the air compressor to the heat exchanger; the first circulating pump component conducts the heat transferred by the heat exchanger to the circulating water tank; the second circulating pump component transfers the heat in the circulating water tank to the water air conditioning unit; the water air conditioning unit dissipates the heat into the room for heating; the above waste heat heating method is a waste heat energy-saving method based on the air compressor.

[0032] As a preferred example, the waste heat heating method further includes an additional energy-saving method, which includes:

[0033] The motor shaft of the circulating water pump is directly driven by the driving motor shaft of the air compressor to rotate, so that the circulating water pump can work without the need for additional power supply, thereby achieving energy saving;

[0034] The motor shaft of the lubricating oil pump is directly driven by the motor shaft of the cooling oil pump to realize the operation of the lubricating oil pump, so that the lubricating oil pump does not need to be connected to an additional power supply, thereby achieving energy saving.

[0035] The beneficial effects of the present invention are:

[0036] Through the present invention, a waste heat heating system and a waste heat heating method based on an air compressor are provided, in which the waste heat generated when the air compressor is working is transferred to the heat exchanger through the cooling oil circuit component, the heat exchanger transfers the heat to the circulating water tank through the first circulating pump component, the hot water in the circulating water tank is transferred to the water air conditioner through the second circulating pump component, and the water air conditioner then transfers the heat to the workshop or living area, thereby realizing waste heat heating. It can not only cool the air compressor, but also provide hot water heating for the workshop, realize the repeated recycling of energy, and save energy and protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the structure of a waste heat heating system based on an air compressor according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of the system structure of a waste heat heating system based on an air compressor in a factory according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the circuit principle of a waste heat heating system based on an air compressor in a factory in an embodiment of the present invention;

[0040] Figure 4 The figure is a schematic diagram of the steps of a waste heat heating method based on an air compressor in a factory according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific diagrams and embodiments.

[0042] Example:

[0043] like Figure 1As shown, it is a brief structural diagram of the waste heat heating system based on the air compressor in an embodiment of the present invention. This embodiment provides a waste heat heating system based on the air compressor in the present invention adopted in a factory. The waste heat heating system includes: an air compressor, a cooling oil circuit assembly, a heat exchanger, a first circulating pump assembly, a circulating water tank, a second circulating pump assembly and a water air conditioning group.

[0044] The general concept of the present invention is as follows:

[0045] A cooling oil circuit assembly is connected between the air compressor and the heat exchanger. The cooling oil circuit assembly is used to transfer waste heat generated by the air compressor to the heat exchanger to form a circulation.

[0046] A first circulating pump assembly is connected between the heat exchanger and the circulating water tank. The first circulating pump assembly is used to transfer the heat generated by the air compressor absorbed by the heat exchanger to the circulating water tank to form a circulation.

[0047] A second circulating pump assembly is connected between the circulating water tank and the water air conditioning unit. The second circulating pump assembly is used to transfer the heat in the circulating water tank to the water air conditioning unit and form a circulation. The water air conditioning unit dissipates heat to the room for heating.

[0048] like Figure 2-Figure 3 1 and 2 are a schematic diagram of the system structure and a schematic diagram of the circuit principle of a waste heat heating system based on an air compressor in a factory according to an embodiment of the present invention.

[0049] Specifically, the air compressor in this embodiment uses the INGERSOLLRAND Centac C800 air compressor model produced by Ingersoll Rand of the United States. It is a large air compressor that is jointly controlled by the Eektronikon MK5 touch screen control system and the Optimizer4.0 centralized intelligent control system, and uses an integrated VSD inverter with a power range of 500 to 900 kW.

[0050] The air compressor in this embodiment includes the following main components: a drive motor, a compressor rotor or impeller, an air inlet, an air outlet, a compressor head, an air storage tank, a lubrication system, a control system, and a control inverter;

[0051] The drive motor acts as the power source for the air compressor, compressing the air by turning the compressor rotor or impeller.

[0052] The compressor rotor or impeller, which consists of multiple curved blades, draws in and compresses the gas as it rotates. The compressor rotor or impeller is typically made of a high-strength alloy to withstand the centrifugal force and gas pressure during high-speed rotation.

[0053] The compressor head serves as the activity space and compression chamber of the rotor or impeller, and the rotor or impeller is arranged inside it.

[0054] Inlet: Air enters the compressor through the air inlet, and the compressor rotor or impeller draws in and compresses the air, then discharges the compressed air.

[0055] Air outlet: The compressor rotor or impeller compresses the gas and discharges it through the air outlet.

[0056] The gas storage tank is used to store compressed gas and is equipped with a solenoid valve, which is controlled by the control system to output compressed gas.

[0057] Lubrication system: Lubricating oil reduces component friction, reduces wear, and helps cool the compressor head. The lubrication system in this embodiment uses a lubrication assembly, which includes a lubricating oil pump, a first frequency converter, a lubricating oil tank, and an oil pipeline. The oil pipeline is connected to the lubricating oil pump and the lubricating oil tank at both ends, respectively. The first frequency converter is electrically connected to the lubricating oil pump. The oil outlet of the lubricating oil pump is connected to the compressor head to provide lubricating oil to the compressor head. The lubricating oil pump also includes a filter for filtering impurities.

[0058] Control system: The control system is used to monitor and regulate gas flow and pressure. The control system can automatically adjust parameters such as the rotational speed and the opening degree of the air inlet and outlet according to the actual operating conditions of the compressor to maintain the optimal performance and efficiency of the compressor. In this embodiment, the control system uses the Eektronikon MK5 touch screen control system and the Optimizer4.0 centralized intelligent control system to jointly control the operation, hereinafter collectively referred to as the intelligent control system.

[0059] Control inverter: The control inverter is electrically connected to the drive motor of the air compressor and is used to control the frequency of the drive motor.

[0060] During normal operation, the compressor head of the air compressor in this embodiment reaches a maximum temperature of approximately 100°C to 120°C before heat dissipation. Within this temperature range, most mechanical materials and lubricants function normally. However, maintaining high temperatures for extended periods can shorten the lifespan of the air compressor. Therefore, the compressor head of the large air compressor in this embodiment must dissipate heat to an appropriate temperature range to ensure normal operation and longevity. Generally, heat dissipation below 60°C is appropriate.

[0061] Therefore, a cooling oil circuit assembly is provided to dissipate heat from the air compressor. The cooling oil circuit assembly in the present invention includes a cooling oil pump, a cooling oil tank, and a cooling oil pipeline.

[0062] The cooling oil tank's ends are connected to the cooling oil pump and heat exchanger via cooling oil pipes. The cooling oil pump delivers the cooling oil from the tank to the heat exchanger, transferring the heat to the heat exchange pipes. A second solenoid valve is also installed on the cooling oil pipe. Its electrical signal is connected to an intelligent control system to control the flow rate and velocity of the cooling oil within the pipe.

[0063] The first circulating pump assembly includes a circulating water pump and a circulating water pipeline. The circulating water pump's ends are connected to the circulating water tank and heat exchanger through the circulating water pipeline. The circulating water pump transports cold water from the circulating water tank to the heat exchanger, where it absorbs heat from the heat exchanger's heat transfer pipeline and then pumps hot water back into the circulating water tank.

[0064] The second circulating pump assembly includes a hot water circulating pump and multiple hot water pipes. The hot water circulating pump's water inlet is connected to a circulating water tank via a hot water pipe, and its water outlet is connected to multiple water air conditioners in the water air conditioning unit via multiple hot water pipes. The hot water circulating pump pumps hot water from the circulating water tank into the water air conditioners, which then transfer the heat to the indoor areas, including production workshops and living areas. The working principle of a water air conditioner differs from that of a traditional air conditioner. Instead of directly cooling or heating the air, it regulates the air temperature through the circulation of water. When the indoor temperature falls below the set point, the water air conditioner's water pump draws hot water from its tank, releasing the heat into the air through the heater in the indoor water air conditioning unit, thereby achieving the heating function.

[0065] Preferably, the waste heat heating system in the embodiment of the present invention also includes a water temperature detection mechanism, which includes a second temperature sensor. The second temperature sensor is used to detect the temperature of the circulating water tank. When the temperature in the circulating water tank is lower than the preset temperature, the second temperature sensor transmits a temperature signal to the internal controller of the indoor air conditioner or heater. The internal controller controls the operation of the air conditioner or heater. In this way, it can ensure that when the air compressor does not generate waste heat when not working or generates less waste heat at low power, it can still ensure that the indoor temperature is warm and automatically control the indoor temperature to prevent the indoor temperature from dropping suddenly once the heat generated is insufficient, affecting the heating effect.

[0066] Preferably, the waste heat heating system in the embodiment of the present invention further includes an air conditioning system, and the air conditioning system is provided between the water conditioning unit and the air compressor. Specifically, the air conditioning system is used to guide indoor air to the air inlet of the air compressor.

[0067] The principle is as follows:

[0068] There are several differences between air compressors compressing warm air and compressing cold air:

[0069] 1. Compression ratio: Under the same inlet pressure and outlet pressure, compressing warm air requires a larger compression ratio because the density of warm air is smaller than that of cold air, and more compression is required to achieve the same outlet pressure.

[0070] 2. Heat transfer efficiency: When compressing warm air, due to the high temperature of the warm air, it is easy to cause a decrease in heat transfer efficiency, thereby increasing energy loss.

[0071] 3. Moisture: Moisture in the air easily condenses during the compression process, causing damage to the equipment or performance degradation. When compressing warm air, moisture condensation is more likely to occur due to the higher saturated vapor pressure of warm air.

[0072] 4. Temperature control: When compressing warm air, the high temperature can easily cause equipment overheating or equipment failure. Therefore, measures need to be taken to control the temperature, such as increasing the flow rate of the cooling medium, using high-temperature materials, etc.

[0073] Therefore, in air compressors, the temperature of the inhaled air has a significant impact on the compression process and equipment performance. Generally speaking, the lower the temperature of the inhaled cold air, the greater the air density, and thus the less power required for compression. Therefore, in theory, the lower the better. However, in actual applications, too low a cold air temperature can also cause the following problems:

[0074] 1. Increase the operating load of the compressor: If the temperature of the inhaled cold air is too low, the moisture in the air will condense into water droplets or ice, causing the compressor impeller or cooler inside the cylinder to freeze or be damaged, increasing the operating load of the compressor.

[0075] 2. Reduced equipment life: Excessively low cold air temperatures can cause overcooling inside the compressor, which can cause stress changes in the compressor body, leading to equipment damage or shortened lifespan. Therefore, the ideal temperature for air intake by air compressors is generally between 5°C and 40°C. Within this temperature range, the cold air has a moderate density, preventing condensation or overcooling of the equipment, while still meeting the requirements of the compression process.

[0076] Based on the above principles, the present invention provides an air conditioning system for delivering air with a relatively suitable indoor temperature to the air inlet of an air compressor. In areas and environments where heating is required, the outdoor air temperature is generally below 5°C. If the outdoor air is directly compressed, the compressor will be overcooled, causing stress changes in the body, causing damage to the equipment or shortening its life, and the working performance of the air compressor will be adversely affected.

[0077] Specifically, the air conditioning system in this embodiment includes a controller, an air delivery device, an air duct, a solenoid valve, a temperature sensor, and a pressure sensor.

[0078] The air delivery device's outlet is connected to the air compressor's inlet via a duct, which in turn connects the air delivery device to the indoor air supply. The duct is equipped with a temperature sensor and a pressure sensor. The air delivery device utilizes a fan. The temperature sensor monitors the air temperature within the duct. The fan and duct transport indoor air to the compressor's inlet. A solenoid valve, temperature sensor, and pressure sensor are each connected to a controller, which is electrically connected to the air compressor's intelligent control system.

[0079] When the outdoor temperature is too low, the air compressor inlet only takes in outdoor air, which will have an adverse effect on the air compressor. The air compressor's own temperature sensor will detect the intake air temperature, and then transmit the low temperature signal to the intelligent control system. The intelligent control system will issue instructions to the controller of the air conditioning system. The controller controls the fan and solenoid valve to work, and then output the relatively warm air in the room to the air compressor inlet through the air duct. Note that this process does not suck out all the warm air generated by the indoor water air conditioner, but the exhaust gas generated by the need for indoor ventilation. Under normal circumstances, the indoor air temperature is more than 5°C higher than the outdoor temperature. In this process, During the process, after the warm air generated by the water air conditioner enters the room, the original air in the room will be discharged to meet the ventilation needs, and the discharged air can be used to introduce the air inlet of the air compressor to neutralize the outdoor air temperature. Of course, as the indoor air temperature gets higher and higher, the air temperature required by the air compressor inlet no longer needs to be introduced too much. The temperature sensor 1 and the pressure sensor will feedback the signal to the controller according to the preset value, so that the controller controls the fan and the solenoid valve 1 to work. By closing or half-closing the solenoid valve 1 and reducing the fan rotation frequency, the delivery of indoor warm air is reduced to ensure that the temperature at the air compressor inlet is kept within the required appropriate range.

[0080] like Figure 4 The figure shows a schematic diagram of the steps of a waste heat heating method based on an air compressor in a factory in an embodiment of the present invention. The method specifically includes: the cooling oil circuit component works to transfer the waste heat generated by the air compressor to the heat exchanger; the first circulating pump component outputs the heat transferred by the heat exchanger to the circulating water tank; the second circulating pump component transfers the heat in the circulating water tank to the water air conditioning group; the water air conditioning group dissipates the heat to the room for heating; the above waste heat heating method is a waste heat energy-saving method based on an air compressor.

[0081] Preferably, the waste heat heating method in this embodiment further includes an additional energy-saving method, which is specifically:

[0082] The motor shaft of the circulating water pump is directly driven by the driving motor shaft of the air compressor to rotate, so that the circulating water pump can work without the need for additional power supply, thereby achieving energy saving;

[0083] The motor shaft of the lubricating oil pump is directly driven by the motor shaft of the cooling oil pump to realize the operation of the lubricating oil pump, so that the lubricating oil pump does not need to be connected to an additional power supply, thereby achieving energy saving.

[0084] The following are detailed explanations of these additional energy-saving methods:

[0085] like Figure 2 As shown, the cooling oil circuit assembly also includes a first coupling and a second frequency converter; the motor shaft of the cooling oil pump is connected to the motor shaft of the lubricating oil pump via the first coupling, and the motor shaft of the lubricating oil pump is driven by the motor shaft of the cooling oil pump. Frequency converter two is electrically connected to frequency converter one, and frequency converter one is used to control the motor speed of the lubricating oil pump, while frequency converter two is used to control the motor speed of the cooling oil pump. Generally speaking, the operating power of the cooling oil pump is greater than that of the lubricating oil pump, but the power of the cooling oil pump is often not maximized, which will cause a "big horse pulling a small cart" situation. Therefore, in order to maximize energy saving, the motor shaft of the cooling oil pump is connected to the lubricating oil pump via the first coupling. In this embodiment, for the INGERSOLL RAND air compressor Centac C800, the required parameters of the cooling oil pump and the lubricating oil pump are as follows:

[0086] Cooling oil pump motor parameters:

[0087] Rated power: usually between 5kW and 30kW.

[0088] Rated voltage: usually 400V or 690V.

[0089] Rated current: usually between 10A and 60A.

[0090] Frequency: Usually 50Hz or 60Hz.

[0091] Speed: Usually between 1500rpm and 3000rpm.

[0092] Lubricating oil pump motor parameters:

[0093] Rated power: usually between 2kW and 15kW.

[0094] Rated voltage: usually 400V or 690V.

[0095] Rated current: usually between 5A and 30A.

[0096] Frequency: Usually 50Hz or 60Hz.

[0097] Speed: Usually between 1000rpm and 3000rpm.

[0098] According to the technical specifications of the Centac C800 centrifugal air compressor provided by Ingersoll Rand, the motor shaft diameters and coupling models of the cooling oil pump and lubricating oil pump of this model are as follows:

[0099] Cooling oil pump motor shaft diameter: 3.375 inches (about 85.7 mm)

[0100] Lubricating oil pump motor shaft diameter: 2.75 inches (about 69.9 mm)

[0101] Coupling model: Lovejoy L-110, dimensions are 5 / 8" x 5 / 8" (approximately 15.9mm x 15.9mm).

[0102] Regarding whether the cooling oil pump will affect the normal operation of the cooling oil pump while driving the lubricating oil pump to work, the present invention also provides a detailed explanation. The working effect of the cooling oil pump is reflected by the heat dissipation effect of the air compressor. If the cooling oil pump has no or very little impact while driving the lubricating oil pump to work, it can be said that the motor shaft of the lubricating oil pump can be directly driven by the motor shaft of the cooling oil pump to realize the operation of the lubricating oil pump, so that the lubricating oil pump does not need to be connected to an additional power supply, thereby achieving energy saving.

[0103] Table 1 below shows the relationship between the cooling oil pump motor power, lubricating oil pump motor power, and the compressor head temperature before and after heat dissipation. The compressor head temperature before heat dissipation refers to the temperature when both the cooling oil pump and lubricating oil pump are not operating, while the compressor head temperature after heat dissipation refers to the temperature when both the cooling oil pump and lubricating oil pump are operating.

[0104]

[0105] Under the same conditions as other factors, the above chart shows that when the rated power of the cooling oil pump motor and the lubricating oil pump motor are the same, or the rated power of the lubricating oil pump motor is lower than that of the cooling oil pump motor, in this case, the actual power change of the lubricating oil pump motor and the cooling oil pump motor are connected via a coupling, and the impact on the heat dissipation of the air compressor head is also small.

[0106] However, when the rated power of the cooling oil pump motor is significantly lower than that of the lubricating oil pump motor, the lubricating oil pump motor drives the cooling oil pump motor through the coupling. The actual power of the two motors varies significantly, which has a significant impact on the heat dissipation effect of the air compressor head, and the air compressor head is basically in a state of no heat dissipation.

[0107] When the cooling oil pump is working, the cooling oil directly dissipates heat to the compressor head through contact transfer and heat conduction. When the lubricating oil pump is working, the temperature of the compressor head is reduced by reducing friction through the lubricating oil. However, if the two are linked by a coupling to achieve an additional energy-saving method where the lubricating oil pump does not require additional power connection, then the rated power of the cooling oil pump motor must be greater than or equal to the rated power of the lubricating oil pump motor, so as not to affect the heat dissipation effect of the air compressor and achieve the purpose of energy saving at the same time.

[0108] Based on the above principle, the same optimization is also performed between the driving motors of the circulating water pump and the air compressor, and the rated power of the driving motor of the air compressor is equal to or greater than the rated power of the motor of the circulating water pump, so as to ensure the normal operation of the circulating water pump without affecting the normal operation of the air compressor.

[0109] Specifically, the first circulating pump assembly also includes a second coupling, a third frequency converter, and the motor shaft of the circulating water pump is connected to the drive motor shaft of the air compressor through the second coupling, and the motor shaft of the circulating water pump is driven by the drive motor shaft of the air compressor; the third frequency converter is electrically connected to the control frequency converter; the control frequency converter is electrically connected to the drive motor of the air compressor and is used to control its frequency, and the third frequency converter is used to control the motor speed of the circulating water pump.

[0110] To sum up, the present invention not only provides a waste heat heating system and a waste heat heating method based on an air compressor, but also transfers the waste heat generated by the air compressor during operation to the heat exchanger through the cooling oil circuit component, and the heat exchanger transfers the heat to the circulating water tank through the first circulating pump component, and the hot water in the circulating water tank is transferred to the water air conditioner through the second circulating pump component, and then the water air conditioner transfers the heat to the workshop or living area, thereby realizing waste heat heating. It can not only cool the air compressor, but also provide hot water heating for the workshop, realize the repeated recycling of energy, and save energy and protect the environment.

[0111] An additional energy-saving method is also provided. When the cooling oil pump and air compressor are working normally, the lubricating oil pump and circulating water pump are driven to work respectively, so that they do not need to be connected to an additional power supply, thereby achieving energy saving.

[0112] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A waste heat heating system based on an air compressor, characterized in that: include: Air compressor, cooling oil circuit assembly, heat exchanger, first circulating pump assembly, circulating water tank, second circulating pump assembly and water conditioning unit; A cooling oil circuit assembly is connected between the air compressor and the heat exchanger, and the cooling oil circuit assembly is used to transfer waste heat generated by the air compressor to the heat exchanger to form a circulation; A first circulating pump assembly is connected between the heat exchanger and the circulating water tank, and the first circulating pump assembly is used to transfer the heat generated by the air compressor absorbed by the heat exchanger to the circulating water tank to form a circulation; A second circulating pump assembly is connected between the circulating water tank and the water air conditioning unit, and the second circulating pump assembly is used to transfer the heat in the circulating water tank to the water air conditioning unit to form a circulation, and the water air conditioning unit dissipates heat to the room for heating; An air conditioning system is further provided between the water conditioning unit and the air compressor, and the air conditioning system is used to guide indoor air to the air inlet of the air compressor; The air conditioning system includes a controller, an air delivery device, an air duct, a temperature sensor and a pressure sensor; The air outlet of the air delivery device is connected to the air inlet of the air compressor through an air duct, and the air inlet of the air delivery device is connected to the room through an air duct, and a temperature sensor and a pressure sensor are respectively provided in the air duct; The gas delivery device includes any one of a blower and an air pump; The air compressor further includes a control frequency converter, which is electrically connected to the drive motor of the air compressor and is used to control the frequency of the drive motor; The first circulating pump assembly includes a circulating water pump, a second coupling, a third frequency converter and a circulating water pipeline, and both ends of the circulating water pump are connected to a circulating water tank and a heat exchanger respectively through the circulating water pipeline; The rated power of the driving motor of the air compressor is equal to or greater than the rated power of the motor of the circulating water pump, and the motor shaft of the circulating water pump is connected to the driving motor shaft of the air compressor through a second coupling, and the motor shaft of the circulating water pump is driven by the driving motor shaft of the air compressor; The frequency converter 3 is electrically connected to the control frequency converter; The control frequency converter is electrically connected to the driving motor of the air compressor and is used to control its frequency. The frequency converter 3 is used to control the motor speed of the circulating water pump.

2. The waste heat heating system based on an air compressor according to claim 1, characterized in that: The air compressor includes a drive motor, a compressor rotor or impeller, a compressor head and an air storage tank; The drive motor serves as a power source for driving the compressor rotor or impeller to rotate; The compressor head is provided with a rotor or impeller inside, and the air is compressed and output pressure is provided through the movement of the rotor or impeller; The gas storage tank is used to store compressed gas; The air compressor also includes a lubrication assembly, which includes a lubricating oil pump, a frequency converter, a lubricating oil tank and an oil pipeline. The two ends of the oil pipeline are respectively connected to the lubricating oil pump and the lubricating oil tank. The frequency converter is electrically connected to the lubricating oil pump. The oil outlet end of the lubricating oil pump is connected to the compressor head for providing lubricating oil to the compressor head.

3. The waste heat heating system based on an air compressor according to claim 2, characterized in that: The cooling oil circuit assembly includes a cooling oil pump, a first coupling, a second frequency converter, a cooling oil tank and a cooling oil pipeline; The two ends of the cooling oil tank are respectively connected to the cooling oil pump and the heat exchanger through cooling oil pipelines; The rated power of the cooling oil pump motor is equal to or greater than the rated power of the lubricating oil pump motor. The motor shaft of the cooling oil pump is connected to the motor shaft of the lubricating oil pump through a first coupling, and the motor shaft of the lubricating oil pump is driven by the motor shaft of the cooling oil pump. The second frequency converter is electrically connected to the first frequency converter. The first frequency converter is used to control the motor speed of the lubricating oil pump, and the second frequency converter is used to control the motor speed of the cooling oil pump.

4. The waste heat heating system based on an air compressor according to claim 1, characterized in that: The waste heat heating system also includes a water temperature detection mechanism, which includes a second temperature sensor. The second temperature sensor is used to detect the temperature of the circulating water tank. When the temperature in the circulating water tank is lower than the preset temperature, the second temperature sensor transmits a temperature signal to the internal controller of the indoor air conditioner or heater, and the internal controller controls the operation of the air conditioner or heater.

5. The waste heat heating system based on an air compressor according to claim 3, characterized in that: The waste heat heating system also includes a temperature monitoring mechanism, which includes a temperature sensor three. The temperature sensor three is electrically connected to the frequency converter one and the frequency converter two. The temperature sensor three is used to monitor the compressor head temperature of the air compressor. When the temperature of the compressor head exceeds the preset temperature, the temperature sensor transmits a temperature signal to the frequency converter one and the frequency converter two. The frequency converter one and the frequency converter two accelerate the circulation speed of the lubricating oil and the cooling oil by controlling the electrode rotation frequency of the lubricating oil pump and the cooling oil pump.

6. The waste heat heating system based on an air compressor according to claim 1, characterized in that: The second circulation pump assembly includes a hot water circulation pump and multiple hot water pipes. The water inlet end of the hot water circulation pump is connected to the circulating water tank through the hot water pipe, and the water outlet end is connected to multiple water air conditioners of the water air conditioner group through the multiple hot water pipes.

7. A method for heating a room using the waste heat generated by the air compressor using the waste heat heating system according to any one of claims 1 to 6, the method comprising: The cooling oil circuit assembly works by transferring the waste heat generated by the air compressor to the heat exchanger; The first circulating pump assembly conducts the heat transferred by the heat exchanger to the circulating water tank; The second circulating pump assembly transfers the heat in the circulating water tank to the water air conditioning unit; the water air conditioning unit dissipates the heat into the room for heating; the above waste heat heating method is a waste heat energy-saving method based on an air compressor.

8. The waste heat heating method based on an air compressor according to claim 7, characterized in that: The waste heat heating method also includes an additional energy-saving method, which includes: The motor shaft of the circulating water pump is directly driven by the driving motor shaft of the air compressor to rotate, so that the circulating water pump can work without the need for additional power supply, thereby achieving energy saving; The motor shaft of the lubricating oil pump is directly driven by the motor shaft of the cooling oil pump to realize the operation of the lubricating oil pump, so that the lubricating oil pump does not need to be connected to an additional power supply, thereby achieving energy saving.

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