A heat fluid heat dissipation and supply device, an air compressor and a heat fluid heat exchange method

Abstract

The application relates to the mechanical field and discloses a hot fluid heat dissipation and heat supply device, an air compressor and a hot fluid heat exchange method, wherein the hot fluid heat dissipation and heat supply device comprises a return air box, the return air box inlet is connected to the exhaust hood, the return air box outlet is connected to the air suction box, and a valve is arranged between the return air box inlet and the outlet. The hot fluid heat dissipation and heat supply device or the air compressor can discharge hot air for recycling, realize internal circulation of the hot air, output the hot air in a low load and a target temperature range, compared with the prior art, the temperature of the output hot air can be improved, the purpose of constant temperature heat supply is achieved by relying on the heat of the device or the air compressor, and the energy utilization rate of the screw air compressor is improved; meanwhile, the oil cooling device and the heat supply device (such as the heat dissipation and heat supply system of the air compressor) are integrated, an independent heat supply system is not needed, and the production cost and the use cost are greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical field, in particular to a heat fluid heat dissipation and heating device, air compressor and heat exchange method. BACKGROUND

[0002] The air compressor is a kind of compressed gas equipment, in the use process of air compressor, electric energy is converted into mechanical energy, a small part of mechanical energy is converted into compressed air energy, most of energy is converted into heat energy and discharged, energy is wasted, and utilization rate is low.

[0003] Therefore, the person skilled in the art is committed to developing a heat fluid heat dissipation and heating device, air compressor and heat exchange method, which can greatly reduce the energy consumption of heating and heating, and also reduce the power consumption of air compressor heat dissipation system. SUMMARY

[0004] In view of the above defects of the prior art, the technical problem to be solved by the present application is to provide a heat fluid heat dissipation and heating device, air compressor and heat exchange method, which can reduce the energy consumption of air compressor and similar devices.

[0005] To achieve the above-mentioned purpose, the present application provides a heat fluid heat dissipation and heating device, which comprises a return air box, the return air box inlet is connected to the exhaust hood, the return air box outlet is connected to the air suction box, and the valve is arranged between the return air box inlet and outlet. The opening of the valve makes the exhaust hood and the negative pressure cavity of the air suction box communicate, so as to realize the internal circulation of the hot air outlet of the exhaust hood, so that the present application can output hot air in the target temperature range under low ambient temperature conditions.

[0006] Preferably, the outer side of the air suction box is provided with a first oil heat exchanger, and the oil outlet of the first oil heat exchanger is connected to the equipment host. Through this setting, the cooling of the equipment oil is ensured.

[0007] Preferably, the outer side of the air suction box is also provided with a compressed air cooler.

[0008] Preferably, the inner side of the air suction box is an exhaust hood, the exhaust hood is provided with the fan blade of centrifugal fan and the fan motor connected to the outer side of the wall;

[0009] The exhaust hood is provided with a temperature sensor. The temperature sensor can detect the air temperature, so as to adjust the air outlet setting in time, and achieve the purpose of normal heat exchange and energy saving.

[0010] Preferably, the upper side of the exhaust hood is connected to the air guide cover, the upper side of the air guide cover is connected to the exhaust hood, and the second oil heat exchanger is arranged between the air guide cover and the exhaust hood.

[0011] Preferably, the oil inlet of the second oil heat exchanger is connected to the oil outlet pipe of the equipment, and the oil outlet of the second oil heat exchanger is connected to the inlet of the temperature control valve.

[0012] Preferably, the temperature control valve is provided with a cold oil outlet and a hot oil outlet, the hot oil outlet is connected to the oil inlet of the first oil heat exchanger, and the cold oil outlet is connected to the main engine of the equipment. If the temperature of the oil cooled by the second oil heat exchanger cannot reach the set temperature, the first oil heat exchanger can be connected through the temperature control valve in the application, the oil just discharged from the equipment is cooled for the first time by the second oil heat exchanger, and whether the oil is cooled again by the first oil heat exchanger is determined again according to the temperature through the temperature control valve, so that the oil temperature is stable, and the service life of the oil and the main engine is prolonged.

[0013] Preferably, the fan motor is a variable frequency control. The fan power can be adjusted according to the outlet air temperature, so as to save electricity.

[0014] The application also provides an air compressor comprising the heat fluid heat dissipation and heat supply device.

[0015] The application also provides a heat fluid heat exchange method, comprising the following steps:

[0016] S1: setting a first set temperature T1, a second set temperature T2 and a third set temperature T3, and T3>T2>T1; and setting an interval detection time t0;

[0017] S2: detecting the outlet air temperature of the heat exchange device to obtain an outlet air temperature Tn, n=1, 2, 3, 4, …, comparing the outlet air temperature Tn with the first set temperature T1, determining whether the outlet air temperature Tn is less than or equal to the first set temperature T1, if yes, entering step S4, and if no, entering step S3;

[0018] S3: determining whether the outlet air temperature Tn is greater than or equal to T3, if yes, entering step S5, and if no, entering step S6;

[0019] S4: guiding part of the outlet air into the air suction box, and guiding the rest of the outlet air to the outside; after completion, the interval time t0 is added, n is added 1, and then step S2 is entered;

[0020] S5: increasing the frequency of the centrifugal fan motor to increase the outlet air volume; guiding all of the outlet air to the outside; after completion, the interval time t0 is added, n is added 1, and then step S2 is entered;

[0021] S6: determining whether the outlet air temperature is greater than or equal to T2; if yes, after completion, the interval time t0 is added, n is added 1, and then step S2 is entered; and if no, entering step S7;

[0022] S7: reducing the frequency of the centrifugal fan motor to reduce the air volume;

[0023] S8: Obtain the last detected air outlet temperature Tn-1, determine whether Tn is less than or equal to Tn-1, if yes, go to step S4, if no, all air outlets are directed to the outside, after the interval time t0, n is added by 1, and then go to step S2;

[0024] Wherein, when n=1, the Tn-1 set value is 0.

[0025] The beneficial effects of the present application are: the present application can utilize the hot air discharged by the heat fluid heat dissipation and supply device or air compressor to realize internal circulation of the hot air, low power consumption, output of hot air in the target temperature range, compared with the prior art, the temperature of the output hot air can be improved, so as to realize the purpose of constant temperature heating by relying on the heat of the device or air compressor itself, improve the energy utilization rate of the screw air compressor; at the same time, the oil cooling device and the heat supply device (such as the heat dissipation and heat supply system of the air compressor) are integrated, without the need for an independent heat supply system, the production cost and use cost are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of example 1.

[0027] Figure 2 is a side view structural schematic diagram of example 1.

[0028] Figure 3 is a top view structural schematic diagram of example 1.

[0029] Figure 4 is a heat exchange process schematic diagram of example 1

[0030] Figure 5 is a structural schematic diagram of example 2.

[0031] Figure 6 is a side view structural schematic diagram of example 2.

[0032] Figure 7 is a flow chart of example 4. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and examples, it should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular way, therefore cannot be understood as limiting the present application. The terms "first", "second", "third" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance.

[0034] Example 1:

[0035] like Figures 1 to 3 As shown, a hot fluid heat dissipation and heating device includes a return air box 9. The inlet of the return air box 9 is connected to the exhaust hood 7, and a temperature sensor 8 is installed inside the exhaust hood 7 to detect the outlet air temperature of the device. The outlet of the return air box 9 is connected to the suction box 13. A valve 10 is provided between the inlet and outlet of the return air box 9. In this embodiment, the valve is a pneumatic valve; in other embodiments, it can also be an electric valve. The valve 10 is connected to a controller (not shown) and is controlled by the controller to open and close. In this patent, by setting up the return air box 9, part of the hot air to be discharged from the exhaust hood 7 of the hot fluid heat dissipation and heating device can be introduced into the return air box 9 for reuse, thereby increasing the temperature of the air discharged by the hot fluid heat dissipation and heating device, achieving the purpose of heat dissipation and heating at the same time, and fully saving and utilizing energy.

[0036] A first oil heat exchanger 12 is installed on the outside of the suction box 13, and the oil outlet 122 of the first oil heat exchanger 12 is connected to the main unit of the equipment. In this patent, the equipment refers to equipment that requires cooling and heat exchange, such as an air compressor. That is, the oil cooled by the first oil heat exchanger 12 can be directly used in the main unit of the equipment.

[0037] The inner side of the suction box 13 is the exhaust box 1, which contains the fan blades 2 of a centrifugal fan and a fan motor 3 connected to it and located on the outer side of the machine wall. In this embodiment, the fan motor 3 is frequency-controlled, so the fan operating frequency can be adjusted according to the exhaust temperature. The lower the frequency, the lower the power consumption, thus achieving a significant energy-saving effect.

[0038] An air guide hood 4 is connected to the upper side of the exhaust box 1, and an exhaust hood 7 is connected above the air guide hood 4. A second oil heat exchanger 6 is installed between the air guide hood 4 and the exhaust hood 7. The oil inlet 61 of the second oil heat exchanger 6 is connected to the oil outlet pipe of the equipment, and the oil outlet 62 of the second oil heat exchanger 6 is connected to the inlet of the temperature control valve 5. The temperature control valve 5 has a cold oil outlet 51 and a hot oil outlet 52. The hot oil outlet 52 is connected to the oil inlet 121 of the first oil heat exchanger 12, and the cold oil outlet 51 is connected to the main unit of the equipment.

[0039] With the above setup, the hot oil in the equipment first enters the second oil heat exchanger 6 through the oil inlet 61. The oil outlet 62 of the second oil heat exchanger 6 is connected to the inlet of the temperature control valve 5. The temperature control valve is set with a comparison temperature; oil exceeding this comparison temperature is considered hot oil, and oil below or equal to this comparison temperature is considered cold oil. If it is cold oil, the temperature control valve 5 controls the opening of the cold oil outlet 51, and the oil flows back into the main equipment to cool it down. If the temperature control valve 5 detects that the oil temperature is hot, it enters the first oil heat exchanger 12 through the hot oil outlet 62 for further cooling, and finally enters the main equipment for use through the oil outlet 122 of the first oil heat exchanger 12.

[0040] The heat exchange process of the hot fluid heat dissipation and heating device in this patent is as follows: Figure 4As shown, after starting the centrifugal fan, the fan motor 3 drives the fan blade 2 to rotate, at this time, a negative pressure cavity is formed in the air suction box 13, and cold air passes through the first oil heat exchanger 12 due to the action of negative pressure, the cold air exchanges heat with the first oil heat exchanger 12, and the cold air after passing through the first oil heat exchanger 12 becomes the first hot air, the first hot air enters the air exhaust box 1 due to the rotation of the fan blade 2, and then pushes into the air guide cover 4, and then passes through the second oil heat exchanger 6 to exchange heat again to form the second hot air, the second hot air can be discharged from the air exhaust cover 7 according to the setting, or can enter the air suction box 13 through the air return box 9 for reuse. The specific heat exchange method is as described in the heat fluid heat exchange method of the present application.

[0041] Of course, the present application is also connected with an electric control assembly, including a controller, the controller is connected with the temperature sensor 8, the valve 10, the centrifugal fan and the temperature control valve 5, the outflow temperature detected by the temperature sensor is transmitted to the controller, so as to control the opening and closing of the valve 10 and the rotation frequency of the centrifugal fan motor.

[0042] Example 2

[0043] The structure of this embodiment is the same as that of example 1, and the difference is that the air suction box 13 is also provided with a compressed air cooler 11. As shown in Figure 5 、 6 The compressed air cooler 11 is arranged above the first oil heat exchanger 12, and is provided with a compressed air inlet 101 and a compressed air outlet 102, so as to cool the compressed air from the air compressor or other main equipment.

[0044] Example 3

[0045] The present application also provides an air compressor, which comprises the heat fluid heat dissipation and heat supply device as described in example 1 or example 2.

[0046] Example 4

[0047] The present application also provides a heat fluid heat exchange method, which can adopt the heat fluid heat dissipation and heat supply device or the air compressor as described above, as shown in Figure 7 The method comprises the following steps:

[0048] S1: setting a first set temperature T1, a second set temperature T2 and a third set temperature T3, and T3>T2>T1; setting an interval detection time t0.

[0049] S2: detecting the temperature of the air outlet of the heat exchange device to obtain the air outlet temperature Tn, n = 1, 2, 3, 4, …, comparing the air outlet temperature Tn with the first set temperature T1 to determine whether the air outlet temperature Tn is less than or equal to the first set temperature T1, if yes, entering step S4, if no, entering step S3. In this step, the temperature sensor 8 arranged in the exhaust hood 7 detects the air outlet temperature of the heat exchange device (i.e. the heat fluid heat dissipation and supply device in the present application), and the temperature sensor 8 is connected to the controller through a communication module, so that the temperature sensor 8 transmits the temperature to the controller, and the controller executes the relevant determination and other steps of the present application.

[0050] S3: determining whether the air outlet temperature Tn is greater than or equal to T3, if yes, entering step S5, if no, entering step S6.

[0051] S4: guiding part of the air outlet into the air suction box 13, and guiding the rest of the air outlet to the outside; after the completion of the interval time t0, n is increased by 1, and then entering step S2. In this step, the controller controls the valve 10 to execute, when it is needed to guide part of the air outlet into the air suction box 13, the controller makes the electromagnetic valve (two-position three-way type) electrified, then the compressed air enters the cylinder, the cylinder pushes the connecting rod to make the valve plate of the valve 10 open. Thus, part of the air outlet can be guided into the air suction box 13 through the air return box 9 for reuse.

[0052] S5: increasing the frequency of the centrifugal fan motor to increase the air outlet amount; guiding the air outlet to the outside; after the completion of the interval time t0, n is increased by 1, and then entering step S2; when the temperature is higher than T3 in step S3, entering this step, which indicates that the air temperature is too high at this time, higher than the set value, at this time, the controller controls the fan motor 3 of the centrifugal fan to increase the frequency to increase the suction speed of the cold air, so as to quickly cool the oil, and the controller closes the valve 10 to guide the air outlet to the outside.

[0053] S6: determining whether the air outlet temperature is greater than or equal to T2; if yes, after the completion of the interval time t0, n is increased by 1, and then entering step S2; if no, entering step S7. When the air outlet temperature is greater than or equal to T2 but less than T3, it indicates that the temperature is relatively high, but has not reached T3, at this time, it can be temporarily not handled.

[0054] S7: adjusting and reducing the frequency of the centrifugal fan motor to reduce the air amount. When the air outlet temperature is less than T2 in step S6, the frequency of the centrifugal fan motor can be adjusted and reduced to reduce the air amount and save energy.

[0055] S8: obtaining the last detected air outlet temperature Tn-1, determining whether Tn is less than or equal to Tn-1, if yes, entering step S4, if no, guiding the air outlet to the outside, after the completion of the interval time t0, n is increased by 1, and then entering step S2.

[0056] Wherein, when n = 1, the set value of Tn-1 is 0.

[0057] In this step, by comparing the outlet air temperatures of two adjacent times, it is determined whether the outlet air of the heat exchange device is heating up or cooling down. If Tn is less than or equal to Tn-1, it is cooling down; otherwise, it is heating up. If the determination result is cooling down, proceed to step S4. The valve remains open, and part of the outlet air is guided back to the suction box, thereby saving energy. If it is heating up, valve 10 is closed, and all the outlet air is guided to the outside for discharge, increasing the amount of cold air entering and improving the oil cooling efficiency.

[0058] The device and method of this invention can realize the internal circulation of hot air. Through the internal circulation of the second hot air, the screw air compressor can output hot air within the target temperature range under low load and low ambient temperature conditions, albeit with reduced air volume, and the maximum temperature of the hot air can be increased. When applied to a screw air compressor, it achieves constant temperature heating by relying on the compressor's own heat, thus improving the energy utilization rate of the screw air compressor. With 100% utilization of the second hot air, the energy utilization rate of the air compressor reaches over 90%, while the energy utilization rate of ordinary screw air compressors is only around 20%. This invention achieves excellent energy saving and emission reduction effects. This invention integrates the heat dissipation and heating system of equipment such as air compressors, eliminating the need for a separate heating system, greatly improving energy efficiency and significantly reducing costs.

[0059] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A heat exchange method for a hot fluid heat dissipation and heating device, characterized in that: The hot fluid heat dissipation and heating device includes a return air box (9), the inlet of the return air box (9) is connected to the exhaust hood (7), the outlet of the return air box (9) is connected to the suction box (13), and a valve (10) is provided between the inlet and outlet of the return air box (9), and the valve (10) is connected to a controller. A first oil heat exchanger (12) is provided on the outside of the suction box (13), and the oil outlet (122) of the first oil heat exchanger (12) is connected to the main unit of the equipment. The air intake box (13) has an exhaust box (1) inside. The exhaust box (1) is connected to the upper side of the air guide hood (4). The exhaust hood (7) is connected above the air guide hood (4). A second oil heat exchanger (6) is provided between the air guide hood (4) and the exhaust hood (7). The oil inlet (61) of the second oil heat exchanger (6) is connected to the oil outlet pipe of the equipment, and the oil outlet (62) of the second oil heat exchanger (6) is connected to the inlet of the temperature control valve (5); The temperature control valve (5) is provided with a cold oil outlet (51) and a hot oil outlet (52). The hot oil outlet (52) is connected to the oil inlet (121) of the first oil heat exchanger (12), and the cold oil outlet (51) is connected to the main unit of the equipment. The heat exchange method includes the following steps executed by the controller: S1: Set the first set temperature T1, the second set temperature T2, and the third set temperature T3, where T3>T2>T1; set the interval detection time t0; S2: Detect the outlet air temperature of the heat exchange device and obtain the air temperature Tn, n = 1, 2, 3, 4... Compare the outlet air temperature Tn with the first set temperature T1 and determine whether the outlet air temperature Tn is less than or equal to the first set temperature T1. If yes, proceed to step S4; if no, proceed to step S3. In this step, the outlet air temperature of the device is detected by the temperature sensor (8) set in the exhaust hood (7). The temperature sensor (8) is connected to the controller through the communication module. S3: Determine whether the outlet air temperature Tn is greater than or equal to the third set temperature T3. If yes, proceed to step S5; otherwise, proceed to step S6. S4: Part of the exhaust air is directed into the suction box (13), and the rest of the exhaust air is discharged to the outside. After the interval t0 is completed, step S2 is then performed. In this step, the controller controls the valve (10) to perform the operation. When it is necessary to direct part of the exhaust air into the suction box (13), the controller energizes the solenoid valve. Then, compressed air enters the cylinder, and the cylinder pushes the connecting rod to open the valve plate of the valve (10). Thus, part of the exhaust air can be directed into the suction box (13) through the return air box (9) for reuse. S5: Increase the frequency of the centrifugal fan motor to increase the air volume; all the air is directed to the outside for discharge; after completing the interval t0, proceed to step S2; when the temperature is detected to be higher than the third set temperature T3 in step S3, proceed to this step, indicating that the air temperature is too high and higher than the set value. At this time, the controller controls the centrifugal fan motor (3) to increase the frequency and increase the intake speed of cold air, thereby quickly cooling the oil. The controller closes the valve (10), and all the air is directed to the outside for discharge. S6: Determine whether the outlet air temperature is greater than or equal to the second set temperature T2; if yes, complete the interval t0 and then proceed to step S2; if no, proceed to step S7. S7: Reduce the frequency of the centrifugal fan motor to decrease the airflow; S8: Obtain the previously detected outlet air temperature Tn-1, determine whether the outlet air temperature Tn is less than or equal to the outlet air temperature Tn-1. If yes, proceed to step S4. If no, all the outlet air is directed to the outside for discharge. After completion, there is an interval t0, and then proceed to step S2. When n=1, the outlet air temperature Tn-1 is set to 0.

2. A heat exchange device for heat dissipation and heating of a hot fluid according to the heat exchange method as described in claim 1, characterized in that: It uses the aforementioned heat exchange method for heat exchange.

3. The heat dissipation and heating device for hot fluid as described in claim 2, characterized in that: A compressed air cooler (11) is also provided on the outside of the air suction box (13).

4. The heat dissipation and heating device for hot fluid as described in claim 2, characterized in that: The exhaust box (1) is equipped with a centrifugal fan blade (2) and a fan motor (3) connected to it and located on the outside of the machine wall; A temperature sensor (8) is installed inside the exhaust hood (7).

5. The heat dissipation and heating device for hot fluid as described in claim 4, characterized in that: The fan motor (3) is frequency converter controlled.

6. An air compressor, characterized in that, Includes the heat dissipation and heating device as described in any one of claims 2 to 5.

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