Air compressor heat recovery device and method

Abstract

The present invention discloses an air compressor heat recovery device, comprising an air compressor, a compressed air-water heat recovery system, a compressor oil-water heat recovery system and an air heat exchanger; the compressed air flows into the compressed air-water heat recovery system, exchanges heat with circulating water, and after the temperature is lowered, enters the air heat exchanger for heat exchange and storage for use; the circulating water that flows out continues to enter the compressor oil-water heat recovery system, exchanges heat with high-temperature lubricating oil, and after the temperature is lowered, it is circulated for use after heat exchange through the air heat exchanger, and the circulating hot water that flows out is finally provided to users for use, and a temperature regulating device is also provided to regulate the temperature of the circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system, which can be remotely controlled, and a method for using the device is also provided; by adopting the present scheme, the temperature value of the circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system is controlled by the temperature regulating device, so that the heat energy of the air compressor can be recovered with high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery, and in particular to a heat recovery device for an air compressor, and a method for using the heat recovery device. Background Art

[0002] During the operation of ordinary air compressors, in order to ensure the normal use of the air compressor, the compressed air and lubricating oil need to be cooled. At present, air cooling is generally used for cooling. This part of the heat is directly discharged into the atmosphere, resulting in the loss of this part of the heat and causing thermal pollution to the environment.

[0003] At the same time, if only air cooling is used, the cooling efficiency will decrease after long-term use, which will make the machine unstable and reduce work efficiency. Summary of the invention

[0004] To solve the above problems, the present invention controls the temperature of circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system through a temperature regulating device, thereby achieving the purpose of recovering the heat energy of the air compressor with higher efficiency and ensuring the reliable and efficient operation of the machine during production.

[0005] To achieve the above-mentioned purpose, the present invention provides an air compressor heat recovery device, comprising an air compressor, a compressed air-water heat recovery system, a compressor oil-water heat recovery system and an air heat exchanger; the air compressed by the air compressor flows into the compressed air-water heat recovery system, exchanges heat with the circulating water flowing through the compressed air-water heat recovery system, and after the temperature is reduced, enters the air heat exchanger, exchanges heat with the outside air, and is stored for use; the circulating water flowing out of the compressed air-water heat recovery system continues to enter the compressor oil-water heat recovery system, exchanges heat with the high-temperature lubricating oil flowing out of the air compressor and separated, and the lubricating oil after the temperature is reduced flows into the air heat exchanger, exchanges heat with the outside air, and circulates into the air compressor for use, and the circulating water flowing out of the compressor oil-water heat recovery system absorbs heat and its temperature rises, and is finally provided to users for use, characterized in that a temperature regulating device is also provided to regulate the temperature of the circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system, and the temperature regulating device can be remotely controlled.

[0006] Furthermore, the air compressor includes an air storage tank and a compressor, and the compressor is fixedly arranged on the upper part of the air storage tank; the temperature regulating device includes a circulating water pump, a lubricating oil proportional valve, and a circulating water proportional valve; the first inlet of the lubricating oil proportional valve is arranged at the lubricating oil flow outlet pipeline of the compressor oil-water heat recovery system, and the second inlet of the lubricating oil proportional valve is connected to the lubricating oil flow inlet pipeline of the compressor oil-water heat recovery system; the outlet of the lubricating oil proportional valve is connected to the lubricating oil collecting inlet pipe of the air heat exchanger; the first inlet of the circulating water proportional valve is arranged at the circulating water flow outlet pipeline of the compressor oil-water heat recovery system, and the second inlet of the circulating water proportional valve is connected to the circulating water flow inlet pipeline of the compressor oil-water heat recovery system, and the outlet of the circulating water proportional valve is connected to the circulating water pump through the circulating water collecting pipeline.

[0007] The above arrangement can not only achieve the effect of flexibly adjusting the required circulating water or lubricating oil temperature to meet the use requirements, but also achieve the effect of being easy to install and use.

[0008] Furthermore, the rotation speed of the circulating water pump is adjustable.

[0009] The speed is adjustable, and the required water temperature effect can be achieved by dynamically adjusting the water flow rate.

[0010] Furthermore, the compressed air-water heat recovery system is a shell and tube heat exchanger.

[0011] The use of shell and tube heat exchangers can achieve compact structure and good heat exchange stability.

[0012] Furthermore, the compressor oil-water heat recovery system is a plate heat exchanger.

[0013] The use of plate heat exchangers can achieve compact structure and high heat exchange efficiency.

[0014] Furthermore, the air heat exchanger is a fin-type structure and is independently arranged from the air compressor.

[0015] The independently arranged fin-type air heat exchanger can achieve the effect of being easy to purchase and replace at low cost and having high reliability in use.

[0016] Furthermore, the air heat exchanger is divided into a first air heat exchanger and a second air heat exchanger, the first air heat exchanger is used for final cooling of compressed air, and the second air heat exchanger is used for final cooling of lubricating oil.

[0017] The above arrangement can achieve the effect of setting heat exchangers of different specifications according to the characteristics of different heat exchange fluids, and respectively performing efficient and reliable heat exchange.

[0018] Furthermore, the temperature regulating device can regulate the temperature of the circulating water flowing out of the outlet of the circulating water proportional valve to 60°C.

[0019] Adjusting the circulating water outlet temperature to 60°C can maximize the user's highest water temperature requirements while ensuring the normal operation of the air compressor.

[0020] Furthermore, the temperature regulating device can regulate the temperature of the lubricating oil flowing out of the outlet of the lubricating oil proportional valve to 65°C.

[0021] Adjusting the lubricating oil temperature to 65°C can achieve the effect of maximizing the recovery of heat energy from the air compressor.

[0022] The present invention also provides a method for adjusting an air compressor heat recovery device, which uses the air compressor heat recovery device to perform adjustment, comprising the following adjustment steps:

[0023] a. Start the air compressor to run. When the oil temperature of the lubricating oil or the exhaust temperature of the compressed air reaches a set value, the circulating water pump starts to run, and the circulating water circulates sequentially into the compressed air-water heat recovery system and the compressor oil-water heat recovery system, and the heat energy of the air compressor is absorbed by the circulating water;

[0024] b. The heated circulating water is finally pumped out through the circulating water pump and provided to users;

[0025] c. When the heat of the air compressor 1 cannot be completely absorbed by the circulating water, the air heat exchanger cooling fan is started to absorb the heat of the air compressor through the forced flow of external air, so that the air compressor can operate constantly in the best operating state;

[0026] The air compressor operates constantly in the best operating state, adopting the following two working modes:

[0027] 1st working mode:

[0028] When the outlet temperature of the lubricating oil flowing out of the compressor oil-water heat recovery system is set to 65°C,

[0029] First, the circulating water pump is running, the second inlet of the lubricating oil proportional valve is closed, and the first inlet of the lubricating oil proportional valve is fully opened;

[0030] Secondly, dynamically adjust the opening ratio of the first inlet and the second inlet of the circulating water proportional valve, and adjust the temperature of the circulating water flowing out of the compressor oil-water heat recovery system pipeline, so as to finally achieve the comprehensive control of the outlet lubricating oil temperature of the compressor oil-water heat recovery system to be constant at 65°C;

[0031] When the speed of the circulating water pump is adjustable, the circulating water flow rate can be adjusted based on the ratio of the opening degrees of the first inlet and the second inlet of the circulating water proportional valve, so as to maintain the temperature of the lubricating oil at the outlet of the compressor oil-water heat recovery system constant at 65°C;

[0032] Second working mode:

[0033] When the outlet temperature of the circulating water flowing out of the compressor oil-water heat recovery system is set to 60°C,

[0034] First, the circulating water pump is running, the second inlet of the circulating water proportional valve is closed, and the first inlet of the circulating water proportional valve is fully opened;

[0035] Secondly, dynamically adjusting the opening ratio of the first inlet and the second inlet of the lubricating oil proportional valve to adjust the temperature of the lubricating oil flowing out of the compressor oil-water heat recovery system pipeline;

[0036] Through the dynamic adjustment of the above steps, the outlet circulating water temperature of the compressor oil-water heat recovery system is finally controlled to be constant at 60°C;

[0037] When the speed of the circulating water pump is adjustable, the circulating water flow rate can be adjusted based on the ratio of the opening degrees of the first inlet and the second inlet of the lubricating oil proportional valve, so as to maintain the outlet temperature of the circulating water flowing out of the compressor oil-water heat recovery system constant at 60°C;

[0038] The first working mode and the second working mode are automatically switched through the temperature adjustment device according to the actual operation status of the air compressor, and the temperature adjustment device can be remotely controlled;

[0039] The temperature regulating device is controlled as follows:

[0040] In the first working mode, when the lubricating oil temperature of the air compressor or the exhaust temperature of the air compressor is higher than the set value, the air compressor is automatically shut down and the circulating water pump is operated; when the lubricating oil temperature of the air compressor or the compressed air temperature returns to the set value, the air compressor starts to run and the circulating water pump continues to run; when the lubricating oil temperature of the air compressor or the exhaust temperature of the air compressor is lower than the set value, the air compressor continues to run and the circulating water pump stops running;

[0041] In the second working mode, when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet is higher than the set value, the air compressor is automatically shut down and the circulating water pump is running; when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet returns to the set value, the air compressor starts running and the circulating water pump continues to run; when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet is lower than the set value, the air compressor continues to run and the circulating water pump stops running;

[0042] d. When the air compressor heat recovery device stops being used, the air compressor stops running, the circulating water pump stops running after a delay of 15 to 30 seconds, and the cooling fans of the first air heat exchanger and the second air heat exchanger stop rotating after a delay of 60 to 90 seconds.

[0043] By adopting this technical solution, the temperature value of circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system can be controlled by setting a temperature regulating device, and can at least reach:

[0044] 1. Recover the heat energy of the air compressor with higher efficiency;

[0045] 2. Ensure the machine can run reliably and efficiently for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a working principle diagram of the present invention.

[0047] In the figure, 1-air compressor, 11-air storage tank, 12-compressor, 121-compressed air, 122-oil, 123-lubricating oil, 2-air heat exchanger, 21-first air heat exchanger, 211-compressed air summary inflow pipe, 212-compressed air outflow pipe, 22-second air heat exchanger, 221-lubricating oil summary inflow pipe, 222-lubricating oil outflow pipe, 3-compressed air-water heat recovery system, 31-first solenoid valve, 32-second solenoid valve, 33-circulating water first inlet pipe, 34-circulating water second inlet pipe, 35-check valve, 36-third solenoid valve Valve, 4-compressor oil-water heat recovery system, 41-lubricating oil main inlet pipe, 42-lubricating oil second inlet pipe, 43-lubricating oil third inlet pipe, 44-circulating water third inlet pipe, 45-circulating water fourth inlet pipe, 46-first temperature sensor, 47-second temperature sensor, 5-circulating water pump, 6-circulating water proportional valve, 61-circulating water proportional valve first inlet, 62-circulating water proportional valve second inlet, 63-circulating water proportional valve outlet, 7-lubricating oil proportional valve, 71-lubricating oil proportional valve outlet, 72-lubricating oil proportional valve second inlet, 73-lubricating oil proportional valve first inlet. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] like Figure 1 As shown, the present invention provides an air compressor heat recovery device, including an air compressor 1, an air heat exchanger 2, a compressed air-water heat recovery system 3 and a compressor oil-water heat recovery system 4;

[0050] The air compressor 1 includes an air storage tank 11 and a compressor 12, and the compressor 12 is fixedly arranged on the upper part of the air storage tank 11; such an arrangement is convenient for installation and use. Of course, other suitable structural arrangements may also be adopted, such as a split arrangement and the like;

[0051] The air heat exchanger 2 includes a first air heat exchanger 21 and a second air heat exchanger 22, both of which are arranged near the outside of the compressor 12. The outside air is forced to flow through the outer surfaces of the first air heat exchanger 21 and the second air heat exchanger 22 through the rotation of the cooling fan, and respectively exchanges heat with the compressed air 121 flowing into the heat exchange pipe of the first air heat exchanger 21 to cool the compressed air 121; and exchanges heat with the compressor lubricating oil 123 flowing into the heat exchange pipe of the second air heat exchanger 22 to cool the lubricating oil 123.

[0052] The compressed air 121 compressed by the compressor 12 flows into the oil separator 122, and after being separated by the oil separator 122, the compressed air 121 separated from the lubricating oil 123 flows into the compressed air-water heat recovery system 3, exchanges heat with the circulating water flowing through the compressed air-water heat recovery system 3, and after the temperature is reduced, enters the first air heat exchanger 21 of the air heat exchanger 2, exchanges heat with the outside air, and then flows into the air storage tank 11 through the compressed air outflow pipe 212 connected to the air storage tank 11 for storage and use; the compressed air 121 from the compressed air-water heat recovery system The circulating water flowing out of the system 3, after absorbing the heat of the compressed air 121, continues to enter the compressor oil-water heat recovery system 4, and exchanges heat with the high-temperature lubricating oil 123 separated from the oil separator 122 and flowing out of the oil separator 122. The lubricating oil 123 with a lowered temperature flows into the second air heat exchanger 22, exchanges heat with the outside air, and then circulates into the compressor 12 through the lubricating oil outflow pipe 222 for use. The circulating water flowing out of the compressor oil-water heat recovery system 4, after absorbing the heat of the lubricating oil 123, continues to increase in temperature and is finally provided to users for use;

[0053] A temperature regulating device is also provided to regulate the temperature of the circulating water or lubricating oil 123 flowing out of the compressor oil-water heat recovery system 4. The temperature regulating device can be remotely controlled, that is, the user can realize remote control through a wired or wireless network.

[0054] In order to flexibly adjust the required temperature of the circulating water or lubricating oil 123 to meet the purpose of use, preferably, the temperature regulating device includes a circulating water pump 5, a circulating water proportional valve 6, and a lubricating oil proportional valve 7, which are specifically configured as follows:

[0055] The first inlet 73 of the lubricating oil proportional valve is arranged at the lubricating oil flow outlet pipeline of the compressor oil-water heat recovery system 4, the second inlet 72 of the lubricating oil proportional valve is connected to the second lubricating oil inlet pipe 42, and the third lubricating oil inlet pipe 43 is connected to the lubricating oil flow inlet pipeline of the compressor oil-water heat recovery system 4. One end of the lubricating oil main inlet pipe 41 is connected to the oil outlet pipe of the oil separator 122, and the other end is divided into two paths, one path is connected to the second lubricating oil inlet pipe 42, and the other path is connected to the third lubricating oil inlet pipe 43. The lubricating oil proportional valve outlet 71 is connected to the lubricating oil summary inlet pipe 221, and finally flows into the second air heat exchanger 22 through the lubricating oil summary inlet pipe 221 for heat exchange.

[0056] The first inlet 61 of the circulating water proportional valve is arranged at the circulating water flow outlet pipeline of the compressor oil-water heat recovery system 4, the second inlet 62 of the circulating water proportional valve is connected to the fourth circulating water inlet pipe 45, the third circulating water inlet pipe 44 is connected to the circulating water flow inlet pipeline of the compressor oil-water heat recovery system 4, and the circulating water flowing out of the compressed air-water heat recovery system 3 is divided into two paths before entering the compressor oil-water heat recovery system 4, one path is connected to the third circulating water inlet pipe 44. The other path is connected to the fourth circulating water inlet pipe 45, and the outlet 63 of the circulating water proportional valve is connected to the circulating water pump 5 through the circulating water collection pipeline, and is pumped out by the circulating water pump 5 for use by users.

[0057] A first temperature sensor 46 is provided between the circulating water outlet of the compressor oil-water heat recovery system 4 and the first inlet 61 of the circulating water proportional valve to sense the temperature of the circulating water flowing out of the compressor oil-water heat recovery system 4 .

[0058] A second temperature sensor 47 is provided between the lubricating oil outlet of the compressor oil-water heat recovery system 4 and the first inlet 73 of the lubricating oil proportional valve to sense the temperature of the lubricating oil flowing out of the compressor oil-water heat recovery system 4 .

[0059] In order to further dynamically adjust the water flow rate to meet the required water temperature, preferably, the speed of the circulating water pump 5 is adjustable.

[0060] The circulating water pump 5 with adjustable speed can be realized by selecting a variable frequency water pump, or by adjusting the speed of the water pump through a frequency converter or other common methods.

[0061] In order to achieve a compact structure and good heat exchange stability when exchanging heat between compressed air and water, preferably, the compressed air-water heat recovery system 3 is a shell and tube heat exchanger.

[0062] The compressed air-water heat recovery system 3 is a shell and tube heat exchanger, and the compressed air 121 and the circulating water pipeline entering the system for heat exchange are arranged as follows:

[0063] Circulating water part: the circulating water flows in from the outside through the main water pipe and is divided into two inflows. One path is connected with the first circulating water inlet pipe 33, enters the compressed air-water heat recovery system 3 through the first circulating water inlet pipe 33, absorbs the heat of the compressed air, circulates out of the compressed air-water heat recovery system 3, and flows through the one-way valve 35; the other path is connected with the second circulating water inlet pipe 34, passes through the third solenoid valve 36, and merges with the circulating water flowing out of the compressed air-water heat recovery system 3 and flowing through the one-way valve 35, and finally flows to the compressor oil-water heat recovery system 4.

[0064] Compressed air part: The compressed air 121 flowing out of the oil separator 122 is divided into two paths, one path is connected to the first solenoid valve 31, and the other path is connected to the second solenoid valve 32. It enters the heat exchange pipe of the compressed air-water heat recovery system 3 through the second solenoid valve 32, exchanges heat with the circulating water flowing through, and releases heat to the circulating water. The compressed air flowing out of the compressed air-water heat recovery system 3 merges with the compressed air flowing out of the first solenoid valve 31, and then flows into the heat exchange pipe of the first air heat exchanger 21 through the compressed air aggregation inflow pipe 211 to exchange heat with the outside air.

[0065] In order to achieve a compact structure and high heat exchange efficiency when the compressor oil, ie, the lubricating oil 123 , exchanges heat with water, preferably, the compressor oil-water heat recovery system 4 is a plate heat exchanger.

[0066] The compressor oil-water heat recovery system 4 may use other heat exchangers of suitable specifications besides the plate heat exchanger, such as a shell-and-tube heat exchanger or a shell-and-tube heat exchanger.

[0067] In order to use and replace at low cost and realize heat exchange with the outside air with high reliability, preferably, the air heat exchanger 2 is a fin-type structure and is independently arranged from the compressor 12.

[0068] In order to efficiently and reliably realize the heat exchange between different heat exchange fluids of compressed air and compressor lubricating oil 123 and the outside air, preferably, the air heat exchanger 2 is divided into a first air heat exchanger 21 and a second air heat exchanger 22. The first air heat exchanger 21 is used for the final cooling of the compressed air 121, and the second air heat exchanger 22 is used for the final cooling of the lubricating oil 123.

[0069] The first air heat exchanger 21 and the second air heat exchanger 22 arranged above can be set as heat exchangers of different specifications and sizes according to the types of heat exchanged fluids and the heat exchange amounts. Under the premise of ensuring reliable use, the efficient heat exchange of the first air heat exchanger 21 and the second air heat exchanger 22 can be ensured through optimized design.

[0070] In order to achieve the purpose of satisfying the user's highest water temperature requirements to the maximum extent when the air compressor is operating normally, preferably, the temperature regulating device can adjust the temperature of the circulating water flowing out of the circulating water proportional valve outlet 63 to 60°C.

[0071] Adjust the temperature of the circulating water flowing out of the circulating water proportional valve outlet 63 to 60°C, which can meet the needs of users in daily life, bathing and other occasions where hot water is needed. When the required temperature exceeds 60°C, an electric heating device (not shown in the figure) can be installed at the outlet to continue heating the circulating water.

[0072] In order to achieve the purpose of maximally recovering the heat energy of the air compressor, preferably, the temperature regulating device can adjust the temperature of the lubricating oil flowing out of the lubricating oil proportional valve outlet 71 to 65°C.

[0073] In addition, based on the above-mentioned adjustment of the air compressor heat recovery device, the present invention also provides an adjustment method for the air compressor heat recovery device, comprising the following adjustment steps:

[0074] a. Start the air compressor 1 to run. When the oil temperature of the lubricating oil 123 or the exhaust temperature of the compressed air 121 reaches the set value, the circulating water pump 5 runs, and the circulating water circulates sequentially into the compressed air-water heat recovery system 3 and the compressor oil-water heat recovery system 4, and the heat energy of the compressor 12 is absorbed by the circulating water;

[0075] b. The heated circulating water is finally pumped out through the circulating water pump 5 and provided to the user;

[0076] c. When the heat of the air compressor 1 cannot be completely absorbed by the circulating water, the cooling fan of the air heat exchanger 2 is started to absorb the heat of the air compressor 1 through the forced flow of outside air, so that the air compressor 1 can operate constantly in the best operating state;

[0077] When the air compressor 1 operates constantly in the optimal operating state, it adopts the following two working modes:

[0078] Working mode 1:

[0079] When the outlet temperature of lubricating oil 123 flowing out of compressor oil-water heat recovery system 4 is set to 65°C:

[0080] First, the circulating water pump 5 is running, the second inlet 72 of the lubricating oil proportional valve is closed, and the first inlet 73 of the lubricating oil proportional valve is fully opened;

[0081] Secondly, dynamically adjust the opening ratio of the first inlet 61 of the circulating water proportional valve and the second inlet 62 of the circulating water proportional valve, and adjust the temperature of the circulating water flowing out of the compressor oil-water heat recovery system 4 pipeline, so as to finally achieve the comprehensive control of the outlet lubricating oil temperature of the compressor oil-water heat recovery system 4 constant at 65°C;

[0082] When the speed of the circulating water pump 5 is adjustable, the method of adjusting the circulating water flow rate by the circulating water pump 5 with adjustable speed can also be adopted on the basis of adjusting the opening ratio of the first inlet 61 of the circulating water proportional valve and the second inlet 62 of the circulating water proportional valve, so as to maintain and control the temperature of the lubricating oil 123 flowing out of the compressor oil-water heat recovery system 4 outlet to be constant at 65° C. Since the second inlet 72 of the lubricating oil proportional valve is closed and the first inlet 73 of the lubricating oil proportional valve is fully opened at this time, the temperature of the lubricating oil flowing into the first inlet 73 of the lubricating oil proportional valve and flowing out from the outlet 71 of the lubricating oil proportional valve is also maintained at 65° C.

[0083] Second working mode:

[0084] When the outlet temperature of circulating water outflowing from the compressor oil-water heat recovery system 4 is set to 60℃:

[0085] First, the circulating water pump 5 is running, the second inlet 62 of the circulating water proportional valve is closed, and the first inlet 61 of the circulating water proportional valve is fully opened;

[0086] Secondly, dynamically adjust the opening ratio between the first inlet 73 of the lubricating oil proportional valve and the second inlet 72 of the lubricating oil proportional valve to adjust the temperature of the lubricating oil 123 flowing out of the pipeline of the compressor oil-water heat recovery system 4;

[0087] Through the dynamic adjustment of the above steps, the temperature of the circulating water at the outlet of the compressor oil-water heat recovery system 4 is finally controlled to be constant at 60°C;

[0088] When the speed of the circulating water pump 5 is adjustable, the circulating water flow rate can be adjusted by the circulating water pump 5 with adjustable speed on the basis of adjusting the opening ratio of the first inlet 73 of the lubricating oil proportional valve and the second inlet 72 of the lubricating oil proportional valve, so as to maintain and control the outlet temperature of the circulating water flowing out of the compressor oil-water heat recovery system 4 to be constant at 60°C. Since the second inlet 62 of the circulating water proportional valve is closed and the first inlet 61 of the circulating water proportional valve is fully opened, the temperature of the circulating water flowing into the first inlet 61 of the circulating water proportional valve and flowing out of the outlet 63 of the circulating water proportional valve is also maintained at 60°C.

[0089] The first working mode and the second working mode are automatically switched through the temperature adjustment device according to the actual operation of the air compressor 1, and the temperature adjustment device can be remotely controlled;

[0090] The temperature regulating device is controlled as follows:

[0091] In the first working mode, when the oil temperature of the lubricating oil 123 of the air compressor 1 or the exhaust temperature of the air compressor 1 is higher than the set value, the air compressor 1 is automatically shut down and the circulating water pump 5 is operated; when the oil temperature of the lubricating oil 123 of the air compressor 1 or the temperature of the compressed air 121 returns to the set value, the air compressor 1 starts to operate and the circulating water pump 5 continues to operate; when the oil temperature of the lubricating oil 123 of the air compressor 1 or the exhaust temperature of the air compressor 1 is lower than the set value, the air compressor 1 continues to operate and the circulating water pump 5 stops operating;

[0092] In the second working mode, when the temperature of the circulating water at the outlet of the compressor oil-water heat recovery system 4 is higher than the set value, the air compressor 1 is automatically shut down and the circulating water pump 5 is operated; when the temperature of the circulating water at the outlet of the compressor oil-water heat recovery system 4 returns to the set value, the air compressor 1 starts to operate and the circulating water pump 5 continues to operate; when the temperature of the circulating water at the outlet of the compressor oil-water heat recovery system 4 is lower than the set value, the air compressor 1 continues to operate and the circulating water pump 5 stops operating;

[0093] d. When the air compressor heat recovery device stops using, the compressor 12 of the air compressor 1 stops running, the circulating water pump 5 stops running after a delay of 15 to 30 seconds, and the cooling fans of the first air heat exchanger 21 and the second air heat exchanger 22 stop rotating after a delay of 60 to 90 seconds;

[0094] If the cooling fan is not rotating, when the compressor 12 stops running, that is, after 60 to 90 seconds of startup, it stops rotating to ensure that the compressed air 121 flowing in the heat exchange tube of the first air heat exchanger 21 and the lubricating oil 123 flowing in the heat exchange tube of the second air heat exchanger 22 are fully cooled.

[0095] In this embodiment, the compressor oil refers to the lubricating oil 123; the circulating water proportional valve 6 and the lubricating oil proportional valve 7 can be driven by a motor, and the opening ratio between different inlets can be infinitely set, that is, the opening ratio between the first inlet 61 of the circulating water proportional valve 6 and the second inlet 62 of the circulating water proportional valve, and the opening ratio between the first inlet 73 of the lubricating oil proportional valve 7 and the second inlet 72 of the lubricating oil proportional valve can be infinitely set, which can meet the needs of precise temperature control to the greatest extent. Of course, in addition to stepless adjustment, a fixed proportional opening degree can also be set, such as the opening ratio between the first inlet 61 of the circulating water proportional valve and the second inlet 62 of the circulating water proportional valve can be set to: 10:0, 7:3, 6:4 or 5:5, etc.; such as the opening ratio between the first inlet 73 of the lubricating oil proportional valve and the second inlet 72 of the lubricating oil proportional valve can be set to: 10:0, 7:3, 6:4 or 5:5, etc., and other suitable ratios.

[0096] The circulating water proportional valve 6 and the lubricating oil proportional valve 7 may adopt proportional valves commonly used in the market.

[0097] The circulating water proportional valve 6 and the lubricating oil proportional valve 7 are connected to the pipeline. In addition to the fixed connection by welding, for the convenience of replacement, they can also be flexibly connected, such as by flange, buckle or thread.

[0098] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air compressor heat recovery device, comprising an air compressor, a compressed air-water heat recovery system, a compressor oil-water heat recovery system and an air heat exchanger; the air compressed by the air compressor flows into the compressed air-water heat recovery system, exchanges heat with the circulating water flowing through the compressed air-water heat recovery system, and after the temperature is reduced, enters the air heat exchanger, exchanges heat with the outside air, and is stored for use; the circulating water flowing out of the compressed air-water heat recovery system continues to enter the compressor oil-water heat recovery system, exchanges heat with the high-temperature lubricating oil flowing out of the air compressor and being separated, and the lubricating oil with the temperature reduced flows into the air heat exchanger, exchanges heat with the outside air, and then circulates into the air compressor for use, and the circulating water flowing out of the compressor oil-water heat recovery system absorbs heat, and its temperature rises, and is finally provided to users for use, characterized in that A temperature regulating device is also provided to regulate the temperature of the circulating water or lubricating oil flowing out of the compressor oil-water heat recovery system, and the temperature regulating device can be remotely controlled; The air compressor comprises an air storage tank and a compressor, and the compressor is fixedly arranged on the upper part of the air storage tank; the temperature regulating device comprises a circulating water pump, a lubricating oil proportional valve, and a circulating water proportional valve; the first inlet of the lubricating oil proportional valve is arranged at the lubricating oil flow outlet pipeline of the compressor oil-water heat recovery system, and the second inlet of the lubricating oil proportional valve is communicated with the lubricating oil flow inlet pipeline of the compressor oil-water heat recovery system; the outlet of the lubricating oil proportional valve is communicated with the lubricating oil collecting inlet pipe of the air heat exchanger; the first inlet of the circulating water proportional valve is arranged at the circulating water flow outlet pipeline of the compressor oil-water heat recovery system, and the second inlet of the circulating water proportional valve is communicated with the circulating water flow inlet pipeline of the compressor oil-water heat recovery system, and the outlet of the circulating water proportional valve is communicated with the circulating water pump through the circulating water collecting pipeline; The air heat exchanger is divided into a first air heat exchanger and a second air heat exchanger. The first air heat exchanger is used for final cooling of compressed air, and the second air heat exchanger is used for final cooling of lubricating oil.

2. The air compressor heat recovery device according to claim 1, characterized in that: The rotating speed of the circulating water pump is adjustable.

3. The air compressor heat recovery device according to claim 2, characterized in that: The compressed air-water heat recovery system is a shell and tube heat exchanger.

4. The air compressor heat recovery device according to claim 3, characterized in that: The compressor oil-water heat recovery system is a plate heat exchanger.

5. The air compressor heat recovery device according to claim 4, characterized in that: The air heat exchanger is a fin-type structure and is independently arranged from the air compressor.

6. The air compressor heat recovery device according to claim 1, characterized in that: The temperature regulating device can regulate the temperature of the circulating water flowing out of the outlet of the circulating water proportional valve to 60°C.

7. The air compressor heat recovery device according to claim 1, characterized in that: The temperature regulating device can regulate the temperature of the lubricating oil flowing out of the lubricating oil proportional valve outlet to 65°C.

8. A method for regulating an air compressor heat recovery device, characterized in that: The air compressor heat recovery device according to any one of claims 1 to 7 is used for adjustment, comprising the following adjustment steps: a. Start the air compressor to run. When the oil temperature of the lubricating oil or the exhaust temperature of the compressed air reaches a set value, the circulating water pump starts to run, and the circulating water circulates sequentially into the compressed air-water heat recovery system and the compressor oil-water heat recovery system, and the heat energy of the air compressor is absorbed by the circulating water; b. The heated circulating water is finally pumped out through the circulating water pump and provided to users; c. When the heat of the air compressor cannot be completely absorbed by the circulating water, the air heat exchanger cooling fan is started to absorb the heat of the air compressor through the forced flow of external air, so that the air compressor can operate constantly in the best operating state; The air compressor operates constantly in the best operating state, adopting the following two working modes: 1st working mode: When the outlet temperature of the lubricating oil flowing out of the compressor oil-water heat recovery system is set to 65°C, First, the circulating water pump is running, the second inlet of the lubricating oil proportional valve is closed, and the first inlet of the lubricating oil proportional valve is fully opened; Secondly, dynamically adjust the opening ratio of the first inlet and the second inlet of the circulating water proportional valve, and adjust the circulating water temperature flowing out of the compressor oil-water heat recovery system pipeline, so as to achieve comprehensive control of the lubricating oil temperature flowing out of the compressor oil-water heat recovery system outlet to be constant at 65°C; When the speed of the circulating water pump is adjustable, the circulating water flow rate can be adjusted based on the ratio of the opening degrees of the first inlet and the second inlet of the circulating water proportional valve, so as to maintain the temperature of the lubricating oil at the outlet of the compressor oil-water heat recovery system constant at 65°C; Second working mode: When the outlet temperature of the circulating water flowing out of the compressor oil-water heat recovery system is set to 60°C, First, the circulating water pump is running, the second inlet of the circulating water proportional valve is closed, and the first inlet of the circulating water proportional valve is fully opened; Secondly, dynamically adjusting the opening ratio of the first inlet and the second inlet of the lubricating oil proportional valve to adjust the temperature of the lubricating oil flowing out of the compressor oil-water heat recovery system pipeline; Through the dynamic adjustment of the above steps, the outlet circulating water temperature of the compressor oil-water heat recovery system is finally controlled to be constant at 60°C; When the speed of the circulating water pump is adjustable, the circulating water flow rate can be adjusted based on the ratio of the opening degrees of the first inlet and the second inlet of the lubricating oil proportional valve, so as to maintain the outlet temperature of the circulating water flowing out of the compressor oil-water heat recovery system constant at 60°C; The first working mode and the second working mode are automatically switched through the temperature adjustment device according to the actual operation status of the air compressor, and the temperature adjustment device can be remotely controlled; The temperature regulating device is controlled as follows: In the first working mode, when the lubricating oil temperature of the air compressor or the exhaust temperature of the air compressor is higher than the set value, the air compressor is automatically shut down and the circulating water pump is operated; when the lubricating oil temperature of the air compressor or the compressed air temperature returns to the set value, the air compressor starts to run and the circulating water pump continues to run; when the lubricating oil temperature of the air compressor or the exhaust temperature of the air compressor is lower than the set value, the air compressor continues to run and the circulating water pump stops running; In the second working mode, when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet is higher than the set value, the air compressor is automatically shut down and the circulating water pump is running; when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet returns to the set value, the air compressor starts running and the circulating water pump continues to run; when the temperature of the circulating water flowing out of the compressor oil-water heat recovery system outlet is lower than the set value, the air compressor continues to run and the circulating water pump stops running; d. When the air compressor heat recovery device stops being used, the air compressor stops running, the circulating water pump stops running after a delay of 15 to 30 seconds, and the cooling fans of the first air heat exchanger and the second air heat exchanger stop rotating after a delay of 60 to 90 seconds.

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