A compressor with waste heat recovery and internal cooling function

Abstract

The application discloses a compressor with waste heat recovery and internal circulation cooling functions, which comprises a frame, an air compression mechanism and a heat exchange mechanism, the air compression mechanism is connected with an oil-gas separation device, the air outlet of the oil-gas separation device is connected with a filtering mechanism, the oil outlet is connected with the heat exchange mechanism, the heat exchange mechanism comprises a heat exchanger, heat exchange pipes and a baffle structure, the heat exchanger has three closed cavities, the heat exchange pipes and the baffle structure are arranged in the middle closed cavity, the middle closed cavity is connected with the liquid outlet and the liquid inlet of an external container through a liquid inlet pipe and a liquid outlet pipe respectively, the two end closed cavities are respectively connected with an oil inlet pipe and an oil outlet pipe, the oil inlet pipe is connected with the oil outlet of the oil-gas separation device, and the oil outlet pipe is connected with the oil inlet of the air compression mechanism; the baffle structure comprises a plurality of spiral plates, the spiral plates are coaxially nested along the radial direction of the closed cavity, the rotation directions of adjacent spiral plates are opposite, and the heat exchange pipes are arranged in the plurality of spiral plates. The baffle structure of the application can have high heat exchange efficiency on the heat exchange pipes.

Description

Technical Field

[0001] This invention relates to the field of air compressor technology, and specifically to a compressor with waste heat recovery and internal circulation cooling functions. Background Technology

[0002] An air compressor is a fundamental product of modern industry and a core component of pneumatic systems. It converts the mechanical energy of a prime mover (usually an electric motor) into the pressure energy of gas, generating compressed air. During operation, an air compressor generates a significant amount of heat during compression, which accounts for approximately 85% of the unit's operating power. This energy is typically exchanged into the atmosphere through the unit's air-cooling or water-cooling system.

[0003] An existing screw air compressor can generate a high-temperature, high-pressure mixture of oil and gas. In order to utilize the waste heat of the mixture, the high-temperature oil and gas are generally separated into gas and liquid and then introduced into their respective cooling systems for cooling. During the cooling process, the oil and gas can exchange heat with external cooling water through a heat exchange device. The cooled water after heat exchange can be stored in a water tank for other uses.

[0004] Existing heat exchange devices used in air compressors are mainly heat exchangers. Heat exchangers generally have spiral baffles and heat exchange tubes passing through the baffles. The spiral baffles can reduce the impact of cooling water on the heat exchange tubes. However, when cooling water passes through a single spiral baffle, the heat exchange efficiency of the heat exchange tubes passing through it is low. The low heat exchange efficiency is difficult to meet the heat exchange requirements. Summary of the Invention

[0005] This invention provides a compressor with waste heat recovery and internal circulation cooling functions, wherein the baffle mechanism in its heat exchanger can achieve high heat exchange efficiency for the heat exchange tubes.

[0006] The compressor of the present invention, which has the functions of waste heat recovery and internal circulation cooling, adopts the following technical solution:

[0007] A compressor with waste heat recovery and internal circulation cooling functions includes a frame, an air compression mechanism, and a heat exchange mechanism. The air compression mechanism is located within the frame, and its output end is connected to an oil-gas separator. The outlet of the oil-gas separator is connected to a filter mechanism, which is configured to filter the air discharged from the oil-gas separator. The heat exchange mechanism is connected to the oil outlet of the oil-gas separator and includes a heat exchanger, heat exchange tubes, and a baffle structure. The heat exchanger is installed within the frame, and three sealed chambers are arranged sequentially along its length. The heat exchange tubes pass through the middle sealed chamber, and their two ends are respectively connected to the other two sealed chambers. The baffle structure is located within the middle sealed chamber, and an inlet pipe and an outlet pipe are provided on the middle sealed chamber. The inlet pipe and outlet pipe are respectively connected to the outlet and inlet of an external container. The sealed chambers at both ends of the heat exchanger are respectively connected to an oil inlet pipe and an oil outlet pipe. The oil inlet pipe is connected to the oil outlet of the oil-gas separator, and the oil outlet pipe is connected to the oil inlet of the air compression mechanism.

[0008] The baffle structure includes multiple spiral plates, which are coaxially nested along the radial direction of the sealed cavity. Adjacent spiral plates rotate in opposite directions, and the heat exchange tubes are inserted through the multiple spiral plates.

[0009] Furthermore, the heat exchange tubes are provided in multiple units, which are evenly arranged in a sealed cavity located in the middle of the heat exchanger.

[0010] Furthermore, in the radial direction of the sealed cavity, the pitch and width of the spiral plates arranged at intervals are equal, and in the length direction parallel to the sealed cavity, the pitch of the spiral plates arranged at intervals gradually decreases or gradually increases, and the width of the corresponding spiral plates gradually increases or gradually decreases.

[0011] The pitch of adjacent spiral plates changes in opposite directions, and the width of the plates also changes in opposite directions.

[0012] Furthermore, the spiral plate has a perforation for the heat exchange tube to pass through, and a buffer sleeve is provided between the perforation and the heat exchange tube.

[0013] Furthermore, the buffer sleeve is a rubber sleeve.

[0014] Furthermore, the air compression mechanism is equipped with a filter, which is located between the oil inlet of the air compression mechanism and the oil outlet of the heat exchanger.

[0015] Furthermore, the air compression mechanism is a twin-screw compressor, which has an air inlet capable of drawing air from the outside;

[0016] The frame contains a drive motor, which is used to drive the twin-screw compressor.

[0017] Furthermore, the filtration mechanism is mounted on the frame and is an air filter. The outlet of the oil-gas separator is connected to the inlet of the air filter through a filter pipe, and the outlet of the air filter is connected to an external air-using device.

[0018] Furthermore, the heat exchange tube is a copper tube.

[0019] Furthermore, air holes are provided on the side plates of the frame.

[0020] The beneficial effects of this invention are:

[0021] The present invention provides a compressor with waste heat recovery and internal circulation cooling functions, which can draw in air from the external environment and compress the drawn air. The compressed air is an oil-gas mixture. The oil-gas mixture enters an oil-gas separation device through the output end of the air compression mechanism. The oil-gas separation device can separate the oil-gas mixture.

[0022] The hot oil separated by the oil-gas separator can enter the sealed cavity at one end of the heat exchanger through the oil inlet pipe, and can also pass through the heat exchange tube to the sealed cavity at the other end of the heat exchanger. When the hot oil passes through the heat exchange tube, it can not only exchange heat with the water flowing through the sealed cavity in the middle of the heat exchanger, but also transfer heat to multiple spiral plates. Since the contact area between the multiple spiral plates and the water flowing through the sealed cavity in the middle of the heat exchanger is larger, the heat exchange tube can transfer more heat to the spiral plates, thereby improving the heat exchange efficiency of the heat exchanger in this invention.

[0023] In addition, since the water introduced into the heat exchanger needs to pass through multiple spiral plates with opposite directions of rotation and coaxial nesting, and the water inevitably experiences turbulence between two adjacent spiral plates when passing through two adjacent spiral plates with opposite directions of rotation, the turbulent water can exchange heat more fully with the heat exchange tubes, which can further improve the heat exchange efficiency of the heat exchanger in this invention.

[0024] Furthermore, in this invention, the pitch and width of the two spaced spiral plates are equal. When the pitch increases, the width of the plate decreases, and when the pitch decreases, the width of the plate increases. Therefore, when the water flows through the two spaced spiral plates, the flow rate gradually decreases or gradually increases. Since the pitch and width of adjacent spiral plates change in opposite directions, the flow rates of the water on the adjacent spiral plates can complement each other. Also, since the spiral directions of the adjacent spiral plates are opposite, turbulence can always occur in the intersection area between the adjacent spiral plates when the water flows through them. This can improve the turbulence effect of the water flowing through the spiral plates and improve the heat exchange efficiency of the heat exchanger.

[0025] Furthermore, adjusting the pitch and width of the spiral plates to a gradual change allows the axial cross-section of the channels within the spiral plates to form an isosceles trapezoid. This enables the heat exchange tubes to pass through adjacent spiral plates, resulting in more connection points between the heat exchange tubes and the spiral plates, thus strengthening the connection between them. Simultaneously, the gradual change in pitch and width leads to a more uniform overall flow velocity when water flows through multiple spiral plates. The resistance of the spiral plates to the water flow is lower compared to spiral plates with smaller pitches, which is beneficial for water flow when passing through multiple spiral plates.

[0026] Furthermore, since the rotation directions of adjacent spiral plates are opposite, the water flows in opposite directions on the adjacent spiral plates. When the water flows in opposite directions impact the heat exchange tube, they can cancel each other out, thereby reducing the possibility of vibration and deformation of the heat exchange tube.

[0027] Furthermore, the buffer sleeve placed between the perforation and the heat exchange tube can not only reduce the collision intensity between the heat exchange tube and each spiral plate, but also greatly reduce the wear between the heat exchange tube and the spiral plate, greatly improve the service life of the heat exchange tube, and thus reduce the cost of using the present invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a compressor with waste heat recovery and internal circulation cooling functions provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a compressor with waste heat recovery and internal circulation cooling functions when the air compression mechanism is separated from the frame, as provided in an embodiment of the present invention.

[0031] Figure 3 A partial exploded structural diagram of the air compression mechanism, oil-gas separation device, and heat exchange mechanism in a compressor with waste heat recovery and internal circulation cooling functions provided in an embodiment of the present invention.

[0032] Figure 4 This is a partial exploded structural diagram of the heat exchange mechanism in a compressor with waste heat recovery and internal circulation cooling functions, provided by an embodiment of the present invention.

[0033] Figure 5This is a schematic diagram of the partially exploded structure between the baffle plate structure and the heat exchange tubes in a compressor with waste heat recovery and internal circulation cooling functions, provided by an embodiment of the present invention.

[0034] Figure 6 This is an exploded structural diagram of a baffle plate structure in a compressor with waste heat recovery and internal circulation cooling functions, provided as an embodiment of the present invention.

[0035] In the diagram: 100, frame; 101, vent; 200, air compression mechanism; 210, oil-gas separation device; 220, filtration mechanism; 230, filter; 300, heat exchange mechanism; 310, heat exchanger; 320, heat exchange tube; 321, isolation plate; 322, liquid inlet pipe; 323, liquid outlet pipe; 324, oil inlet pipe; 325, oil outlet pipe; 330, baffle plate structure; 3301, first fixing rod; 3302, second fixing rod; 331, first spiral plate; 332, second spiral plate; 333, third spiral plate; 334, fourth spiral plate; 400, external container. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] like Figures 1 to 6 As shown in the figure, an embodiment of the present invention provides a compressor with waste heat recovery and internal circulation cooling functions, including a frame 100, an air compression mechanism 200 and a heat exchange mechanism 300.

[0040] Specifically, the frame 100 can be a box-type structural component, with multiple air holes 101 for gas flow on its side plates. An air compressor 200 is installed inside the frame 100. The air compressor 200 can be an existing twin-screw compressor with an internal oil injection system. The air compressor 200 has an input end and an output end; the input end is the air inlet of the air compressor 200, and the output end is the air outlet of the air compressor 200. The input end of the air compressor 200 is directly connected to the external environment, and the output end of the air compressor 200 is connected to an oil-gas separator 210 via a pipe.

[0041] A drive motor is also installed inside the frame 100, which can drive the air compression mechanism 200 to operate via a transmission belt. When the drive motor is running, the air compression mechanism 200 can compress the air entering the air compression mechanism 200. At this time, the oil injection system inside the air compression mechanism 200 can inject oil into the compressed air. The oil can cool the compressed air, thereby forming an oil-air mixture in the air compression mechanism 200.

[0042] The oil-gas separator 210 can be an existing oil-gas separator. The oil-gas separator 210 receives an oil-gas mixture output from the air compression mechanism 200 and separates it into gas and liquid. The gas is discharged through the outlet of the oil-gas separator, and the liquid is discharged through the oil outlet of the oil-gas separator. A filter mechanism 220 is connected to the outlet of the oil-gas separator 210. The filter mechanism 220 is mounted on the frame 100 and filters the air discharged from the oil-gas separator 210. The filter mechanism 220 can be an air filter. The inlet of the air filter is connected to the outlet of the oil-gas separator 210 via a filter pipe. The outlet of the air filter can be connected to an external air-using device, which can reuse the hot air discharged through the air filter, improving heat recovery efficiency.

[0043] The heat exchange mechanism 300 is connected to the oil outlet of the oil-gas separator 210. The heat exchange mechanism 300 includes a heat exchanger 310, a heat exchange tube 320, and a baffle structure 330. The heat exchanger 310 is installed inside the frame 100. The heat exchanger 310 can be a tank or tube with a certain volume. Two isolation plates 321 are provided in the inner cavity of the heat exchanger 310. The two isolation plates 321 divide the inner cavity of the heat exchanger 310 into three sealed chambers. The three sealed chambers are arranged sequentially along the length of the heat exchanger 310.

[0044] The heat exchange tube 320 can be a copper tube. The length of the heat exchange tube 320 is parallel to the length of the heat exchanger 310. The heat exchange tube 320 passes through a sealed cavity located in the middle of the heat exchanger 310, and its two ends are connected to two other sealed cavities. An inlet pipe 322 and an outlet pipe 323 are connected to the sealed cavity in the middle of the heat exchanger 310. The inlet pipe 322 and the outlet pipe 323 are located near the two ends of the sealed cavity in the middle, and are connected to the outlet and inlet of the external container 400, respectively. An oil inlet pipe 324 and an oil outlet pipe 325 are connected to the sealed cavities at both ends of the heat exchanger 310, respectively. The end of the oil inlet pipe 324 away from the heat exchanger 310 is connected to the oil outlet of the oil-gas separator 210, and the end of the oil outlet pipe 325 away from the heat exchanger 310 is connected to the oil inlet of the air compressor 200.

[0045] The external container 400 is a water-holding container located outside the invention, and can be a water tank, water tower, etc. The sealed cavities at both ends of the heat exchanger 310 are connected to the outlet and inlet of the external container 400 respectively via an inlet pipe 322 and an outlet pipe 323. Specifically, the inlet pipe 322 is connected to the sealed cavity in the middle of the heat exchanger 310, away from the end of the sealed cavity connected to the oil inlet pipe 324.

[0046] A baffle structure 330 is disposed within the central sealed cavity of the heat exchanger 310. The baffle structure 330 includes multiple spiral plates, which are coaxially nested along the radial direction of the sealed cavity, with adjacent spiral plates rotating in opposite directions. Heat exchange tubes 320 pass through the multiple spiral plates, which are configured to improve the heat exchange efficiency of the heat exchange tubes 320.

[0047] The operating principle of this invention is as follows:

[0048] First, the air compressor 200, oil-gas separator 210 and air filter of the present invention are started. The air compressor 200 draws in air from the external environment. When the air is compressed, the oil injection system of the air compressor 200 can spray oil into the air to cool it. The compressed air (oil-gas mixture) of the air compressor 200 is introduced into the oil-gas separator 210 through its exhaust port and pipe.

[0049] After the oil-gas separation device 210 separates the oil and gas from the received air, the separated gas is passed through the filter pipe to the air filter. After the air filter purifies the received air, it is passed into the external air-using equipment. The external air-using equipment can reuse the received warm air, which can improve the heat recovery efficiency of the present invention.

[0050] The hot oil separated by the oil-gas separator 210 enters the sealed cavity at one end of the heat exchanger 310 through the oil inlet pipe 324, and then flows through the heat exchange pipe 320 to the sealed cavity at the other end of the heat exchanger 310. It is then re-entered into the oil inlet of the air compressor 200 by the oil outlet pipe 325 on the corresponding sealed cavity, thereby completing the recycling of the oil in the air compressor 200.

[0051] When the hot oil passes through the heat exchange tube 320, the water in the external container 400 can be introduced into the central sealed cavity of the heat exchanger 310 through the liquid inlet pipe 322, and after passing through multiple coaxial spiral plates, it is introduced back into the external container 400 through the liquid outlet pipe 323.

[0052] In this invention, when hot oil passes through heat exchange tube 320, it can exchange heat with the water flowing through the sealed cavity in the middle of heat exchanger 310, and can also transfer heat to multiple spiral plates. The contact area between the multiple spiral plates and the water flowing through the sealed cavity in the middle of heat exchanger 310 is larger, enabling more efficient heat exchange with the water flowing through the sealed cavity in the middle of heat exchanger 310. Furthermore, since the liquid inlet pipe 322 is connected to the sealed cavity in the middle of heat exchanger 310 at a position far from the sealed cavity at the end of heat exchanger 310 connected to oil inlet pipe 324, hot oil and water can form a counter-current flow in heat exchanger 310. The temperature difference between the counter-flowing hot oil and water is larger, resulting in high heat exchange efficiency.

[0053] In addition, since the water introduced into the heat exchanger 310 from the external container 400 needs to pass through multiple spiral plates with opposite directions of rotation and coaxial arrangement, and the water inevitably experiences turbulence between two adjacent spiral plates when passing through two adjacent spiral plates with opposite directions of rotation, the turbulent water can exchange heat more fully with the heat exchange tube 320, which can further improve the heat exchange efficiency of the heat exchanger 310 in this invention.

[0054] Furthermore, there are multiple heat exchange tubes 320, and the length direction of each heat exchange tube 320 is parallel to the length direction of the heat exchanger 310. The multiple heat exchange tubes 320 are all located in the central sealed cavity of the heat exchanger 310 and are evenly distributed on the axial cross section of the heat exchanger 310.

[0055] Multiple heat exchange tubes 320 can pass through multiple spiral plates arranged in the sealed cavity in the middle of the heat exchanger 310, thereby having a larger contact surface with the spiral plates. This allows the hot oil to transfer more heat to the spiral plates as it passes through the multiple heat exchange tubes 320, and thus transfer more heat to the water flowing through the sealed cavity in the middle of the heat exchanger 310, thereby improving the heat exchange efficiency of the heat exchanger 310 in this invention.

[0056] In some embodiments, the two ends of multiple spiral plates disposed in the sealed cavity in the middle of the heat exchanger 310 are respectively fixed to two isolation plates 321 near the two ends of the heat exchanger 310.

[0057] In the radial direction of the sealed cavity, the pitch and width of the spaced spiral plates are equal. In the longitudinal direction (axial direction) parallel to the sealed cavity, the pitch of the spaced spiral plates gradually decreases or gradually increases, and the width of the corresponding spiral plates gradually increases or gradually decreases. That is, when the pitch of the spaced spiral plates gradually decreases, the width of the corresponding spiral plates gradually increases, and when the pitch gradually increases, the width of the corresponding spiral plates gradually decreases.

[0058] Meanwhile, the pitch of two adjacent spiral plates changes in opposite directions, and the width of the plates also changes in opposite directions. That is, when the pitch of a spiral plate gradually increases and the width of the plate gradually decreases in the axial direction parallel to the sealed cavity, the pitch of the spiral plate adjacent to that spiral plate gradually decreases and the width of the plate gradually increases in the corresponding direction.

[0059] For example: Assume there are four spiral plates, which are defined as the first spiral plate 331, the second spiral plate 332, the third spiral plate 333, and the fourth spiral plate 334 in the radial direction of the sealed cavity from the outside to the inside. The first spiral plate 331 is fixed in the middle of the sealed cavity by a first fixing rod 3301. The second spiral plate 332 is disposed in the inner channel of the first spiral plate 331, the third spiral plate 333 is disposed in the inner channel of the second spiral plate 332, and the fourth spiral plate 334 is fixed in the inner channel of the third spiral plate 333 by a second fixing rod 3302. Multiple heat exchange tubes 320 pass through the first spiral plate 331, the second spiral plate 332, the third spiral plate 333, and the fourth spiral plate 334.

[0060] Multiple first fixing rods 3301 may be provided, and the multiple first fixing rods 3301 are evenly arranged around the central axis of the heat exchanger 310 between the two isolation plates 321 in the heat exchanger 310. One second fixing rod 3302 is provided, which is fixed between the two isolation plates 321 and is coaxially arranged with the heat exchanger 310.

[0061] The first spiral plate 331 is fixed to multiple first fixing rods 3301, and the outer end wall of the first spiral plate 331 abuts against the inner wall of the heat exchanger 310. The second spiral plate 332 is inserted into the inner channel of the first spiral plate 331 through multiple unit tubes, and both ends of the second spiral plate 332 are fixedly connected to the isolation plates 321 located at both ends of the central sealed cavity. The third spiral plate 333 is inserted into the inner channel of the second spiral plate 332 through multiple unit tubes, and both ends of the third spiral plate 333 are fixedly connected to the two isolation plates 321. The fourth spiral plate 334 is fixed in the second fixing rod 3302 and is located in the inner channel of the third spiral plate 333.

[0062] In this embodiment, the first spiral plate 331 and the third spiral plate 333 have the same spiral direction, the second spiral plate 332 and the fourth spiral plate 334 have the same spiral direction, and the spiral direction of the first spiral plate 331 is opposite to that of the second spiral plate 332. The staggered arrangement of the spiral directions of the four spiral plates increases the turbulence effect when water passes through the four spiral plates, especially when passing through the boundary area between adjacent spiral plates with opposite spiral directions. This accelerates the mixing speed of water in the spiral channels on different spiral plates, thereby improving the heat exchange efficiency of the four spiral plates and improving the heat exchange efficiency of the heat exchanger 310 of this invention.

[0063] In this embodiment, the pitch and width of the first spiral plate 331 and the third spiral plate 333 are equal, and both are right-handed; the pitch and width of the second spiral plate 332 and the fourth spiral plate 334 are equal, and both are left-handed. Along the direction from the oil inlet pipe 324 to the oil outlet pipe 325 connected to the heat exchanger 310, the pitch of the first spiral plate 331 and the third spiral plate 333 gradually increases, while the width of the plate gradually decreases; conversely, the pitch of the second spiral plate 332 and the third spiral plate 333 gradually decreases, while the width of the plate gradually increases.

[0064] Among them, the ends of the first spiral plates 331 and 333 with smaller pitch and larger plate width are closer to the liquid inlet pipe 322 of the heat exchanger 310. Therefore, when water passes through multiple spiral plates, the water flow is initially larger along the first spiral plates 331 and 333, and smaller along the second spiral plates 332 and 334. As water flows through each spiral plate, the amount of water flowing on the first spiral plates 331 and 333 gradually decreases, while the amount flowing on the second spiral plate 332... The amount of water flowing on the fourth spiral plate 334 gradually increases. That is, when the water first flows on the spiral plate, the amount of water flowing in the right-hand direction is larger. Then the amount of water flowing in the right-hand direction gradually decreases, while the amount of water flowing in the left-hand direction gradually increases. Taking the midpoint of the spiral plate as the boundary, the water flow trends on both sides of the midpoint are opposite. The change in the water flow trend can increase the turbulence effect of the water when passing through the spiral plate, so that the water flow on both sides of the midpoint of the spiral plate can be more fully mixed, thereby improving the heat exchange efficiency between the water and the hot oil in the heat exchange tube 320.

[0065] Furthermore, assuming that the heat exchanger 310 contains only one spiral plate with equal width and pitch, a smaller pitch results in more perforations on the spiral plate for the heat exchange tube 320, which enhances its stability. Conversely, a larger pitch leads to fewer perforations, resulting in less stability for the heat exchange tube 320. However, a smaller pitch also increases the resistance of the spiral plate to water flow, while a larger pitch reduces its stability for the heat exchange tube 320. Therefore, to balance the resistance of the spiral plate to water flow and improve the stability of the heat exchange tubes running on it, this embodiment adjusts both the spiral plate pitch and width to a gradual change, ensuring that the inner channels of the first spiral plate 331, the second spiral plate 332, and the third spiral plate 333 have isosceles trapezoidal cross-sections along their respective axial directions. This design allows the heat exchange tube 320 to pass through adjacent spiral plates when it is installed on the spiral plates, resulting in more connection points between the heat exchange tube 320 and the spiral plates, and making the connection of the heat exchange tube 320 on the spiral plates more stable. At the same time, when the water flows through multiple spiral plates, the gradually changing pitch and plate width result in a more moderate overall flow velocity. The resistance of the spiral plates to the water flow is smaller than that of spiral plates with smaller pitch, which is beneficial for the water flow to pass through multiple spiral plates.

[0066] In this embodiment, since the rotation directions of adjacent spiral plates are opposite, the water flows in opposite directions on the adjacent spiral plates. When the water flows in opposite directions impact the heat exchange tube 320, they can cancel each other out, thereby reducing the possibility of vibration and deformation of the heat exchange tube 320.

[0067] Furthermore, the spiral plates are provided with perforations for the heat exchange tubes 320 to pass through. When the heat exchange tubes 320 are inserted into the perforations, a buffer sleeve is provided between the heat exchange tubes 320 and the perforations. The buffer sleeve can be a rubber sleeve sandwiched between the wall of the perforation and the outer wall of the heat exchange tubes 320. The buffer sleeve is configured to reduce wear between each spiral plate and the heat exchange tubes 320.

[0068] In this embodiment, when water flows through the spiral channel of multiple coaxial spiral plates, it will inevitably impact the spiral surface of each spiral plate, which may cause collisions and misalignments between the spiral plates and the heat exchange tube 320. When the spiral plates collide with the heat exchange tube 320, they will damage the heat exchange tube 320. When the spiral plates misalign with the heat exchange tube 320, they will cause wear to the heat exchange tube 320, thereby reducing the service life of the heat exchange tube 320 and increasing the operating cost of the heat exchanger 310 in this invention.

[0069] The buffer sleeve set between the perforation and the heat exchange tube 320 can not only reduce the collision intensity between the heat exchange tube 320 and each spiral plate, but also greatly reduce the wear between the heat exchange tube 320 and the spiral plate, greatly improve the service life of the heat exchange tube 320, and thus reduce the cost of using the present invention.

[0070] Furthermore, the air compression mechanism 200 is equipped with a filter 230, which is located between the oil inlet of the air compression mechanism 200 and the oil outlet pipe 325 of the heat exchanger 310. The filter 230 is used to filter the oil that enters the air compression mechanism 200 from the oil outlet pipe 325, so as to reduce the impurities mixed in the oil.

[0071] The filter 230 can filter out impurities mixed in the oil, thereby improving the cleanliness of the cooling oil in the oil injection system of the air compressor 200, so that the oil injection system in the air compressor 200 can normally inject cooling oil into the air when compressing air, ensuring the normal operation of the air compressor 200.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A compressor with waste heat recovery and internal circulation cooling functions, characterized in that, include: frame; An air compression mechanism is installed inside the frame, and its output end is connected to an oil-gas separator. The outlet of the oil-gas separator is connected to a filter mechanism, which is configured to filter the air discharged from the oil-gas separator. The heat exchange mechanism is connected to the oil outlet of the oil-gas separator. The heat exchange mechanism includes a heat exchanger, heat exchange tubes, and a baffle structure. The heat exchanger is installed in a frame. Three sealed chambers are arranged sequentially along the length of the heat exchanger. The heat exchange tubes pass through the middle sealed chamber and are connected to the other two sealed chambers at both ends. The baffle structure is set in the middle sealed chamber. The middle sealed chamber is provided with an inlet pipe and an outlet pipe. The inlet pipe and outlet pipe are connected to the outlet and inlet of the external container, respectively. The sealed chambers at both ends of the heat exchanger are connected to an oil inlet pipe and an oil outlet pipe, respectively. The oil inlet pipe is connected to the oil outlet of the oil-gas separator, and the oil outlet pipe is connected to the oil inlet of the air compression mechanism. The baffle structure includes multiple spiral plates, which are coaxially nested along the radial direction of the sealed cavity. Adjacent spiral plates rotate in opposite directions, and the heat exchange tubes are inserted through the multiple spiral plates. The heat exchange tubes are provided in multiple units, which are evenly arranged in a closed cavity located in the middle of the heat exchanger; the two ends of the multiple spiral plates arranged in the closed cavity in the middle of the heat exchanger are respectively fixed to two isolation plates near the two ends of the heat exchanger. In the radial direction of the sealed cavity, the spiral plates arranged at intervals have equal pitch and equal plate width. In the length direction parallel to the sealed cavity, the pitch of the spiral plates arranged at intervals gradually decreases or gradually increases, and the corresponding plate width of the spiral plates gradually increases or gradually decreases. The pitch of adjacent spiral plates changes in opposite directions, and the width of the plates also changes in opposite directions.

2. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The spiral plate has a perforation for the heat exchange tube to pass through, and a buffer sleeve is provided between the perforation and the heat exchange tube.

3. A compressor with waste heat recovery and internal circulation cooling functions according to claim 2, characterized in that: The buffer sleeve is a rubber sleeve.

4. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The air compression mechanism is equipped with a filter, which is located between the oil inlet of the air compression mechanism and the oil outlet of the heat exchanger.

5. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The air compression mechanism is a twin-screw compressor, which has an air inlet that can draw air from the outside. The frame contains a drive motor, which is used to drive the twin-screw compressor.

6. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The filtration mechanism is mounted on the frame and is an air filter. The air outlet of the oil-gas separator is connected to the air inlet of the air filter through a filter pipe, and the air outlet of the air filter is connected to an external air-using device.

7. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The heat exchange tube is a copper tube.

8. A compressor with waste heat recovery and internal circulation cooling functions according to claim 1, characterized in that: The side panels of the frame have air holes.

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