A high-power screw compressor with waste heat recovery function

Abstract

The utility model discloses a high-power screw compressor with waste heat recovery function, including a chassis, a high-power screw compressor main unit with waste heat recovery function installed on the chassis base, and the unit is controlled to operate at normal temperature through an air intake system, a heat exchange system, a cooling system and an exhaust system, wherein the motor is electrically connected to a control system, the control system includes a programmable logic controller, a pressure sensor, and a solenoid valve, and the programmable logic controller is connected to the motor through a contactor. The utility model has the characteristics of high working efficiency, energy saving, space saving, high reliability of the whole machine, long service life, and the ability to provide high-temperature hot water while providing compressed air.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to a high-power screw compressor with a waste heat recovery function. Background Art

[0002] An air compressor is a device used to compress gas. The structure of an air compressor is similar to that of a water pump. Most air compressors are reciprocating piston type, rotary blade or rotary screw, and centrifugal compressors are very large application equipment. The motors of existing air compressors currently generate a lot of heat during operation. Many industries require a large flow of compressed air and use process hot water or domestic hot water. In the prior art, the technical disadvantage of waste heat recovery is that the heat loss is large, which reduces the efficiency of heat recovery. High-power screw machines with waste heat recovery function are an important means of providing a large flow of clean compressed air while using the waste heat of the screw machine to provide hot water. How to reduce the energy consumption of high-power screw machines with waste heat recovery function, reduce costs, increase reliability, increase life, and stably provide high-temperature hot water has always been a problem faced by air compressor manufacturers.

[0003] How to solve the above problems has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a high-power screw compressor with waste heat recovery function, which has high working efficiency, firm internal installation, high integration, space saving, high whole machine reliability and long service life.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a high-power screw compressor with waste heat recovery function, including a chassis; the characteristics are: the chassis includes a shock absorption system, an air intake system, a heat exchange system, a cooling system, an exhaust system, and a control system, the shock absorption system includes shock absorbers, and the shock absorbers are arranged linearly; the shock absorption system is equipped with a screw main engine, a center bracket, a coupling and a motor, and a temperature sensor is installed on the screw main engine; the air intake system includes an air filter, an air intake pipe and an air intake valve, and the air filter is connected to the air intake valve through the air intake pipe; the heat exchange system includes a heat exchanger, an oil inlet pipe and an outlet pipe An oil pipe, one end of the oil inlet pipe and the oil outlet pipe are respectively connected to the heat exchanger, the other ends of the oil inlet pipe and the oil outlet pipe are connected to the cooler, the middle section of the oil inlet pipe is connected to the coupling, the oil inlet pipe is connected to the side of the screw main unit through the coupling, and the middle section of the oil outlet pipe is connected to the screw main unit; the cooling system includes a cooler and a fan, and the cooler is connected to the fan; the exhaust system includes a pressure sensor, a minimum pressure valve and an exhaust tank, the lower end of the exhaust tank is connected to the screw main unit, the upper end of the exhaust tank is connected to the minimum pressure valve, and the other end of the minimum pressure valve is connected to the cooler;

[0007] The control system comprises a programmable logic controller, a wiring block and a contactor, and the programmable logic controller is electrically connected to the motor via the contactor.

[0008] The utility model further provides that the pressure sensor is installed on the minimum pressure valve.

[0009] The utility model further comprises that the main engine of the screw machine is connected with the motor via a central bracket and a coupling.

[0010] The utility model further comprises that the pressure sensor and the temperature sensor are electrically connected to the control system through a programmable logic controller respectively.

[0011] Due to the adoption of the above structure, the utility model has the following beneficial effects:

[0012] 1. The utility model adopts a high-power screw machine main unit with waste heat recovery function. The high-power screw machine main unit with waste heat recovery function and the motor are connected as a whole through a center bracket and a coupling. The main accessories such as temperature sensor, air intake valve, etc. are installed on the high-power screw machine main unit with waste heat recovery function, and the structure is reasonable and compact. The high-power screw machine main unit with waste heat recovery function, the motor, the center bracket and the coupling frame are installed on the shock absorption system, which is convenient for installation and improves the rationality and firmness of the installation. In addition, a programmable logic controller and a programmable logic controller are added for the frequency conversion control of the motor, so that the operating speed of the motor can be adjusted according to different working conditions, which can improve the working efficiency of the high-power screw machine with waste heat recovery function and save energy.

[0013] 2. The utility model adds an oil inlet pipe, an oil outlet pipe and a heat exchanger. During the operation of the screw machine, the heat in the screw oil is recovered through the heat exchanger, and the heat is used to heat the cooling water. The cooling water is heated to become finished hot water with a qualified temperature to provide users with domestic hot water or process hot water, thereby saving energy and improving energy utilization.

[0014] The present invention will become more clear through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 This is one of the overall structural diagrams of the utility model;

[0017] Figure 2 This is the second schematic diagram of the overall structure of the utility model;

[0018] Figure 3 This is the third schematic diagram of the overall structure of the utility model.

[0019] Legend:

[0020] 10. Shock absorption system; 11. Shock absorber; 20. Intake system; 201. Air filter; 202. Intake duct; 203. Intake valve; 30. Heat exchange system; 301. Heat exchanger; 302. Oil inlet pipe; 303. Oil outlet pipe; 40. Cooling system; 401. Cooler; 402. Fan; 50. Exhaust system; 501. Pressure sensor; 502. Minimum pressure valve; 503. Exhaust tank; 60. Control system; 601. Programmable logic controller; 602. Terminal block; 603. Contactor; 604. Temperature sensor; 7. Motor; 8. Screw main unit; 9. Bracket; 12. Coupling. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Please refer to Figures 1 to 3 The utility model provides a high-power screw compressor with waste heat recovery function, including a chassis, wherein the chassis includes a shock absorbing system 10, an air intake system 20, a heat exchange system 30, a cooling system 40, an exhaust system 50, and a control system 60. The shock absorbing system 10 is used to reduce the vibration of the motor and the main engine of the high-power screw compressor with waste heat recovery function to the chassis when the motor is working; the air intake system 20 is used to filter and compress the air to ensure that the unit is automatically vented during no-load startup and stable operation, loading, unloading and shutdown; the heat exchange system 30 is used to take away the heat of the main engine, and heat the cooling water through the heat exchanger to provide finished hot water of qualified temperature; the cooling system 40 is used to cool the high-pressure air of the unit; the exhaust system 50 is used to monitor the exhaust pressure and realize constant pressure control of the pressure, so as to achieve precise control; the control system 60 is used to electrically connect with each working system to control the operation of each system and adjust each system, so as to adjust the running speed of the motor according to different working conditions, thereby saving energy and ensuring the continuous and efficient operation of the air compressor.

[0023] The shock absorption system 10 includes a plurality of shock absorbers 11, each of which is arranged linearly. The shock absorbers 11 are arranged on the base inside the chassis. The shock absorption system is provided with a motor 7, a screw main unit 8, a central bracket 9 and a coupling 12, so that the motor 7 and the high-power screw main unit 8 with waste heat recovery function are suspended in the air, which reduces the vibration of the chassis caused by the motor 7 and the high-power screw main unit 8 with waste heat recovery function when they are working. A temperature sensor 604 is installed on the screw main unit 8, and the temperature sensor 604 monitors the temperature of the screw main unit 8. The air intake system 20 includes an air filter 201, an air intake duct 202 and an air intake valve 203, and the air filter 201 is connected to the air intake valve 203 through the air intake duct 202. The heat exchange system 30 includes a heat exchanger 301, an oil inlet pipe 302 and an oil outlet pipe 303. One end of the oil inlet pipe 302 and the oil outlet pipe 303 are respectively connected to the heat exchanger 301, and the other ends of the oil inlet pipe 302 and the oil outlet pipe 303 are connected to the cooler 401, wherein the middle section of the oil inlet pipe 302 is connected to the coupling 12. The oil inlet pipe 302 is connected to the side of the screw main unit 8 through the coupling 12 to supply oil, thereby lubricating and absorbing heat from the screw main unit. The middle section of the oil outlet pipe 301 is connected to the screw main unit 8. After the oil inlet pipe 302 lubricates and absorbs heat from the screw main unit, the heat of the main unit enters the oil outlet pipe 303 along with the lubricating oil, and the absorbed heat is brought into the heat exchanger 301. The cooling system 40 includes a cooler 401 and a fan 402, and the cooler 401 and the fan 402 are connected. The minimum pressure valve 502, the pressure sensor 501 and the exhaust tank 503 constitute the exhaust system 50, the lower end of the exhaust tank 503 is connected to the screw main unit 8, the upper end of the exhaust tank 503 is connected to the minimum pressure valve 502, the other end of the minimum pressure valve 502 is connected to the cooler 401, the pressure sensor 501 is installed on the minimum pressure valve 502, and the pressure sensor 501 is used to detect the exhaust pressure of the minimum pressure valve 502. The high-power screw main unit 8 with waste heat recovery function is connected to the motor 7 through the central bracket 9 and the coupling 12, and the motor 7 is electrically connected to a control system. The control system 60 includes a programmable logic controller 601, a terminal block 602, and a contactor 603. The programmable logic controller 601 is electrically connected to the motor 7 through the contactor 603.

[0024] In the present invention, the six shock absorbers 11 form a shock absorbing system, and the screw main unit 8, the center bracket 9, the coupling 12 and the motor 7 are mounted on the shock absorbing system 10 located below it. Thus, the motor 7 and the high-power screw main unit 8 with waste heat recovery function are suspended in the air, which reduces the vibration of the motor 7 and the high-power screw main unit 8 with waste heat recovery function on the chassis when they are working.

[0025] In the utility model, a temperature sensor 604 is installed on the high-power screw main unit 8 with waste heat recovery function, and a pressure sensor 501 is installed on the minimum pressure valve 502. And the pressure sensor 501 and the temperature sensor 604 are both part of the control system, and are electrically connected to the programmable logic controller 601 through the interface terminal. The air filter 201, the air intake pipe 202 and the air intake valve 203 are installed in the chassis to form the air intake system 20. The heat exchanger 301, the oil inlet pipe 302 and the oil outlet pipe 303 form the heat exchange system 30. The fan 402 and the cooler 401 form the cooling system 40. The minimum pressure valve 502, the pressure sensor 501 and the exhaust tank 503 form the exhaust system 50.

[0026] During operation, air is filtered by the air filter 201 and enters the air intake pipe 202, and then is sucked into the screw main unit 8 for compression and exhaust through the air intake valve 203. The high-pressure gas is compressed by the screw main unit 8 and enters the exhaust system 50. The high-pressure air enters the cooling system 40 through the exhaust system 50 and is cooled by the cooler 401, and then is discharged to the outside through the fan 402. At the same time, the heat exchange system 30 lubricates and takes away the heat of the screw main unit 8 through the oil inlet pipe 302 and the oil outlet pipe 303, and heats the cooling water through the heat exchanger 301 to provide finished hot water of qualified temperature. The pressure sensor 501 and the temperature sensor 604 belong to the control system, and are both electrically connected to the programmable logic controller 601 through the interface terminal. The pressure sensor 501 detects the exhaust pressure and is electrically connected to the programmable logic controller 601 to achieve constant pressure control, allowing the air compressor to adjust the motor speed according to the pressure signal feedback, thereby achieving precise control; the temperature sensor 604 is installed on the high-power screw main unit 8 with waste heat recovery function to detect the oil temperature, and is electrically connected to the programmable logic controller 601. The current working condition is judged according to the temperature, and the fan 402 is controlled through the interface terminal and the programmable logic controller 601, thereby automatically regulating the operating temperature of the machine system.

[0027] In the utility model, an air filter 201 is installed in the chassis, and an air intake pipe 202 and an air intake valve 203 form an air intake system 30, which ensures that the unit is automatically vented during no-load startup, stable operation, loading, unloading and shutdown.

[0028] In the present invention, the heat exchanger 301, the oil inlet pipe 302 and the oil outlet pipe 303 form a heat exchange system 30. The fan 402 and the cooler 401 form a cooling system 40. The temperature sensor 604 determines the unit operating temperature and controls the operation of the heat exchanger to ensure that the unit can operate at the required operating temperature.

[0029] During the operation of the utility model, the motor 7 drives the high-power screw main unit 8 with waste heat recovery function to compress the air, the temperature sensor 604 monitors the temperature, and determines the current working condition based on the monitoring data, so that the programmable logic controller 601 can perform frequency conversion control on the motor 7 in real time, and the pressure sensor 501 monitors the pressure and determines the current working condition based on the monitoring data, so that the programmable logic controller 601 can control the speed of the motor 7, thereby saving energy and ensuring the continuous and efficient operation of the air compressor.

[0030] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific implementation methods, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the utility model without departing from the scope of the technical solution of the utility model, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A high-power screw compressor with waste heat recovery function, comprising a chassis; characterized in that: The chassis comprises a shock absorbing system (10), an air intake system (20), a heat exchange system (30), a cooling system (40), an exhaust system (50), and a control system (60). The shock absorption system (10) comprises shock absorbers (11), and the shock absorbers (11) are arranged linearly; a screw main unit (8), a center bracket (9), a coupling (12) and a motor (7) are arranged on the shock absorption system, and a temperature sensor (604) is installed on the screw main unit (8); The air intake system (20) comprises an air filter (201), an air intake pipe (202) and an air intake valve (203), wherein the air filter (201) is connected to the air intake valve (203) via the air intake pipe (202); The heat exchange system (30) comprises a heat exchanger (301), an oil inlet pipe (302) and an oil outlet pipe (303); one end of the oil inlet pipe (302) and the oil outlet pipe (303) are respectively connected to the heat exchanger (301); the other ends of the oil inlet pipe (302) and the oil outlet pipe (303) are connected to a cooler (401); the middle section of the oil inlet pipe (302) is connected to a coupling (12); the oil inlet pipe (302) is connected to a side of a screw main unit (8) through the coupling (12); and the middle section of the oil outlet pipe (303) is connected to the screw main unit (8); The cooling system (40) comprises a cooler (401) and a fan (402), and the cooler (401) and the fan (402) are in communication; The exhaust system (50) comprises a pressure sensor (501), a minimum pressure valve (502) and an exhaust tank (503), wherein the lower end of the exhaust tank (503) is connected to the screw main unit (8), the upper end of the exhaust tank (503) is connected to the minimum pressure valve (502), and the other end of the minimum pressure valve (502) is connected to the cooler (401); The control system (60) comprises a programmable logic controller (601), a terminal block (602), and a contactor (603); the programmable logic controller (601) is electrically connected to the motor (7) via the contactor (603).

2. The high-power screw compressor with waste heat recovery function according to claim 1 is characterized in that: The pressure sensor (501) is installed on the minimum pressure valve (502).

3. The high-power screw compressor with waste heat recovery function according to claim 1 is characterized in that: The screw main unit (8) is connected to the motor (7) via a central bracket (9) and a coupling (12).

4. The high-power screw compressor with waste heat recovery function according to claim 3 is characterized in that: The pressure sensor (501) and the temperature sensor (604) are electrically connected to the control system (60) via the programmable logic controller (601), respectively.

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