A high-efficiency flooded evaporator for a magnetic levitation variable-frequency water chiller

Abstract

The application belongs to the field of evaporators, and provides a high-efficiency flooded evaporator for a magnetic suspension variable-frequency water chiller, which comprises a cylinder, one end of the cylinder is provided with a refrigerant inlet at the bottom, the other end of the cylinder is provided with a refrigerant outlet at the top, the inside of the cylinder is respectively fixedly provided with a left sealing plate and a right sealing plate at both ends, a plurality of heat exchange pipes are installed between the left sealing plate and the right sealing plate, a return water box is fixedly connected to the side of the left sealing plate away from the right sealing plate, an inlet and outlet water box is fixedly connected to the side of the right sealing plate away from the left sealing plate, and the return water box and the inlet and outlet water box are respectively communicated with both ends of all the heat exchange pipes. Through the setting of the side groove and the blowing mechanism, the blowing mechanism will always blow the lubricating oil floating on the surface of the refrigerant into the side groove during the refrigerant gasification process, so as to avoid the long-time residue of the lubricating oil in the cylinder and the adhesion of the lubricating oil on the pipe wall of the heat exchange pipe, thereby avoiding the reduction of the heat exchange efficiency of the heat exchange pipe.

Description

Technical Field

[0001] This invention belongs to the field of evaporators, and particularly relates to a high-efficiency full-liquid evaporator for magnetic levitation variable frequency chiller units. Background Technology

[0002] With the development of technology, using carbon dioxide (CO2) as a refrigerant has gradually become an emerging technology. In the path of combining carbon utilization with refrigeration, CO2 can be used directly as a natural refrigerant, or it can be used to produce synthetic refrigerants from captured CO2. Among existing technologies, directly using captured CO2 as a refrigerant (R744) is currently the most mature, effective, and widely applied technology. It successfully converts industrial CO2 emissions into an environmentally friendly and efficient refrigerant, directly reducing the carbon footprint of the refrigeration industry (especially direct emissions), alleviating the problem of global warming, and is a key force driving the low-carbon transformation of the refrigeration industry.

[0003] As an advanced refrigeration device, the magnetic levitation chiller mainly uses refrigerant as the medium for operation. The magnetic levitation chiller mainly consists of an evaporator, a condenser, a motor, a compressor, and a control box. During its operation, the gaseous refrigerant is compressed by the compressor and discharged. It enters the condenser and condenses into a liquid state. Then it is divided into two paths. One path of liquid refrigerant enters the evaporator after being throttled by the dryer and expansion valve. After being evaporated into gaseous refrigerant in the evaporator, it returns to the compressor. The other path of liquid refrigerant returns directly to the cooling end of the compressor motor. During this process, the liquid refrigerant in the evaporator cools the cooling water in the cooling system.

[0004] However, during the refrigerant cycle, gaseous refrigerant (CO2) may carry away some of the lubricating oil in the compressor and eventually enter the evaporator. Due to the low temperature and slow flow rate inside the evaporator, the lubricating oil may remain there, which in turn causes the lubricating oil to adhere to the wall of the heat exchange tube, thereby reducing the heat transfer efficiency of the evaporator. Summary of the Invention

[0005] The purpose of this invention is to provide a high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units, aiming to solve the technical problem in the prior art where lubricating oil in the evaporator easily adheres to the heat exchange tube wall, resulting in a reduction in the heat transfer efficiency of the evaporator.

[0006] This invention is implemented as follows: a high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit includes a cylindrical body, which is open at both ends. Each end of the cylindrical body has a hemispherical end cap, designated as a left end cap and a right end cap. A refrigerant inlet is located at the bottom of one end of the cylindrical body, and a refrigerant outlet is located at the top of the other end. A left sealing plate and a right sealing plate are fixedly installed at both ends inside the cylindrical body, forming a sealed cavity between the left and right sealing plates. Several heat exchange tubes are installed between the left and right sealing plates, with both ends of all the heat exchange tubes penetrating the left and right sealing plates respectively. The left sealing plate faces away from the... A return water box is fixedly connected to the side of the right sealing plate, and an inlet / outlet water box is fixedly connected to the side of the right sealing plate opposite to the left sealing plate. The return water box and the inlet / outlet water box are respectively connected to both ends of all heat exchange tubes. A partition plate is fixedly connected inside the inlet / outlet water box, which divides the inside of the inlet / outlet water box into an inlet water chamber and an outlet water chamber. Both the inlet water chamber and the outlet water chamber are connected to the heat exchange tubes. A cooling water outlet pipe and a cooling water inlet pipe are fixedly connected to the side of the inlet / outlet water box. One end of both the cooling water outlet pipe and the cooling water inlet pipe extends out of the end cap. The cooling water outlet pipe is connected to the outlet water chamber, and the cooling water inlet pipe is connected to the inlet water chamber.

[0007] Both sides of the inner side of the cylinder are fixedly connected with folding plates, which are "L" shaped plates. A side groove is formed between the folding plates and the inner wall of the cylinder. A second oil return pipe is fixedly connected to the side of the cylinder, and one end of the second oil return pipe is connected to the side groove.

[0008] The cylinder is also equipped with a purging mechanism located above all the heat exchange tubes. The purging mechanism is used to blow the lubricating oil floating on the refrigerant into the side groove so that the lubricating oil can be returned to the compressor. At the same time, it prevents the lubricating oil from staying inside the cylinder for a long time, causing it to adhere to the tube wall of the heat exchange tube and thus avoiding a decrease in the heat exchange efficiency of the heat exchange tube.

[0009] Further technical solution: The purging mechanism includes a transfer air box fixedly installed on the side of the right / left sealing plate. Two purging pipes are rotatably installed on the transfer air box. One end of each purging pipe is rotatably installed on the left / right sealing plate. Both purging pipes are connected to the transfer air box. Each purging pipe has several air holes. A gas replenishment mechanism is fixedly installed on the side of the transfer air box. The gas replenishment mechanism is used to replenish gas into the transfer air box. The gas in the transfer air box enters the two purging pipes and is blown out from the air holes.

[0010] The purging mechanism also includes a drive mechanism, which is installed on the side of the left / right sealing plate. The drive mechanism is used to drive the two purging pipes to rotate synchronously in opposite directions, so that the gas blown out from the air hole can drive the lubricating oil on the refrigerant into the side groove.

[0011] Further technical solution: The air replenishment mechanism includes an air replenishment cylinder fixedly installed on the side of the transfer air box. A piston block is slidably installed inside the air replenishment cylinder. A piston rod is fixedly connected to the side of the piston block away from the transfer air box. The air replenishment cylinder is provided with four one-way valve assemblies, namely two inlet one-way valves and two outlet one-way valves. The two inlet one-way valves and two outlet one-way valves are respectively located on both sides of the piston block, and are named as first inlet one-way valve, second inlet one-way valve, first outlet one-way valve, and second outlet one-way valve from left to right and from top to bottom. The air replenishment mechanism also includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the two inlet one-way valves, and the outlet pipe is connected to the two outlet one-way valves. One end of the outlet pipe is connected to the transfer air box.

[0012] The air replenishment mechanism also includes a transmission mechanism, which is installed on the left / right sealing plate. One end of the transmission mechanism is connected to a purge pipe, and the other end is connected to a piston rod. When the purge pipe rotates, the transmission mechanism drives the piston rod to reciprocate.

[0013] Further technical solution: The one-way valve assembly includes a valve body fixedly connected to the air supply cylinder. The valve body has an air passage communicating with the inside of the air supply cylinder. The valve body also has an installation cavity communicating with the air passage. A fixing ring communicating with the air passage is fixedly connected to the side wall of the installation cavity. A movable baffle is hinged to the side of the fixing ring. In its natural state, the movable baffle hangs down naturally and blocks the fixing ring.

[0014] Further technical solution: The transmission mechanism includes a reciprocating screw rotatably mounted on the left / right sealing plate, one end of the reciprocating screw being threadedly connected to the piston rod, a first drive gear being fixedly mounted on the purge pipe, and a first driven gear being fixedly mounted on the reciprocating screw, the first driven gear and the first drive gear being meshed together.

[0015] A further technical solution: The diameter of the first driving gear is 3 to 6 times the diameter of the first driven gear, which can make the piston rod move faster, greatly increase the amount of air replenished per unit time, and improve the purging effect.

[0016] Further technical solution: The drive mechanism includes a motor fixedly installed on the left / right sealing plate, the output shaft of the motor is fixedly connected to a second drive gear, one end of each of the two purge pipes is fixedly connected to a second driven gear, the second drive gear meshes with a second driven gear, and two meshing intermediate gears are rotatably installed on the side of the left / right sealing plate, the two intermediate gears mesh with two second driven gears respectively.

[0017] Further technical solution: An oil storage tank is fixedly installed on the side of the left / right sealing plate. One end of each of the two purge pipes extends into the oil storage tank. A first return oil pipe is connected to the side of the oil storage tank. One end of the first return oil pipe extends out of the end cap. A vent is fixedly installed inside each purge pipe. The vent is made of a breathable membrane material. The vent is shaped like a horizontal frustum. The large diameter end of the vent faces the oil storage tank, and the small diameter end of the vent is connected to the transfer air box.

[0018] A further technical solution: multiple heat exchange tubes pass through the side groove.

[0019] A further technical solution: A preheating assembly is also installed at the bottom of the cylinder. The preheating assembly includes a horizontal partition plate fixedly installed inside the cylinder. Several vertical partition plates are fixedly connected to the bottom of the horizontal partition plate. Multiple heat exchange tubes pass through the multiple vertical partition plates. An upper flow channel is opened at the top of each of the multiple vertical partition plates, and a lower flow channel is opened at the bottom of the other vertical partition plates. The multiple upper flow channels and multiple lower flow channels are staggered, thereby forming a wave-shaped water channel between the multiple vertical partition plates. The refrigerant inlet is connected to one end of the water channel, and an outlet connected to the water channel is opened at the end of the horizontal partition plate away from the refrigerant inlet.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In this invention, by setting a side groove and a purging mechanism, during the refrigerant vaporization process, the purging mechanism will continuously blow the lubricating oil floating on the surface of the refrigerant into the side groove, avoiding the lubricating oil remaining in the cylinder for a long time and avoiding the lubricating oil adhering to the tube wall of the heat exchange tube, thereby avoiding the reduction of the heat exchange efficiency of the heat exchange tube.

[0022] 2. In this invention, by setting up an air replenishment mechanism, air is replenished into the transfer air box every time the piston rod reciprocates, so as to achieve uninterrupted purging of lubricating oil and greatly improve the lubricating oil recovery efficiency.

[0023] 3. In this invention, by setting up an oil storage tank and a venting cylinder, after the gaseous refrigerant is drawn from the cylinder through the air inlet pipe, it will pass through the venting cylinder for filtration, leaving liquid lubricating oil residue in the venting cylinder. Finally, it will flow into the oil storage tank along the venting cylinder, thereby improving the effect of intercepting lubricating oil, reducing the lubricating oil adhesion rate, and thus preventing some lubricating oil from being carried into the compressor by the gaseous refrigerant, causing some lubricating oil to participate in the circulation again, which would lead to an increase in the adhesion rate of lubricating oil on the heat exchange tube.

[0024] 4. In this invention, multiple heat exchange tubes pass through the side groove. After the refrigerant enters the side groove, the multiple heat exchange tubes will exchange heat with the refrigerant in the side groove, thereby causing the refrigerant to re-vaporize and then escape from the side groove, avoiding the refrigerant being drawn out, which would lead to a reduction in the amount of refrigerant and a decrease in the cooling effect.

[0025] 5. In this invention, by setting up a preheating component, when refrigerant is introduced into the cylinder through the refrigerant inlet, the liquid refrigerant will flow along the wavy water channel. The heat exchange tubes that run through the water channel will exchange heat with the refrigerant, thereby preheating the liquid refrigerant. When the refrigerant flows out from the outlet, the liquid refrigerant will form a liquid layer above the horizontal partition. This liquid layer can fully exchange heat with other heat exchange tubes and will not be neutralized by the subsequent low-temperature refrigerant, so that the liquid layer can fully boil, greatly improving the gasification efficiency and improving the working efficiency of the equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the overall internal structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the overall internal structure of the present invention from a bottom view.

[0029] Figure 4 In this invention Figure 3 Enlarged diagram of point A in the middle.

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the air replenishment mechanism in this invention.

[0031] Figure 6 In this invention Figure 5 Enlarged diagram of point B in the middle.

[0032] Figure 7 In this invention Figure 5 Enlarged diagram of point C in the middle.

[0033] Figure 8 This is a schematic diagram of the cross-sectional structure of the purge tube in this invention.

[0034] Figure 9 This is a bottom view of the preheating component in this invention.

[0035] Figure 10 This is a schematic diagram of the overall internal structure from the side view of the present invention.

[0036] In the attached diagram: 1. Cylinder body; 2. Refrigerant inlet; 3. Refrigerant outlet; 4. Purge mechanism; 41. Oil reservoir; 42. First oil return pipe; 43. First drive gear; 44. First driven gear; 45. Purge pipe; 46. Reciprocating screw; 47. Piston rod; 48. Air supply cylinder; 49. Air inlet pipe; 410. Air outlet pipe; 411. Transfer air box; 412. Electric motor; 413. Second drive gear; 414. Second driven gear; 415. Intermediate gear; 416. Vent cylinder; 417. Air hole; 418. 419. Piston block; 4191. One-way valve assembly; 4192. Valve body; 4193. Air passage; 4194. Fixing ring; 4195. Movable baffle; 4196. Mounting cavity; 5. Left sealing plate; 6. Preheating assembly; 61. Horizontal partition; 62. Upper flow channel; 63. Lower flow channel; 64. Vertical partition; 65. Water outlet; 7. Heat exchange tube; 8. Right sealing plate; 9. Divider plate; 10. Inlet and outlet water boxes; 11. Cooling water outlet pipe; 12. Cooling water inlet pipe; 13. Return water box; 14. Second oil return pipe; 15. Baffle plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0039] like Figures 1-10As shown, this invention provides a high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit, comprising a cylindrical body 1, which is a cylinder open at both ends. Both ends of the cylindrical body 1 are provided with hemispherical end caps, designated as a left end cap and a right end cap. A refrigerant inlet 2 is provided at the bottom of one end of the cylindrical body 1, and a refrigerant outlet 3 is provided at the top of the other end. A left sealing plate 5 and a right sealing plate 8 are fixedly installed at both ends inside the cylindrical body 1, forming a sealed cavity between the left and right sealing plates 5 and 8. Several heat exchange tubes 7 are installed between the left and right sealing plates 5 and 8, with both ends of all heat exchange tubes 7 penetrating the left and right sealing plates 5 and 8 respectively. The side of the left sealing plate 5 facing away from the right sealing plate 8... A return water box 13 is fixedly connected. An inlet / outlet water box 10 is fixedly connected to the side of the right sealing plate 8 away from the left sealing plate 5. The return water box 13 and the inlet / outlet water box 10 are respectively connected to both ends of all heat exchange tubes 7. A partition plate 9 is fixedly connected inside the inlet / outlet water box 10. The partition plate 9 divides the inside of the inlet / outlet water box 10 into an inlet chamber and an outlet chamber. Both the inlet chamber and the outlet chamber are connected to the heat exchange tubes 7. A cooling water outlet pipe 11 and a cooling water inlet pipe 12 are fixedly connected to the side of the inlet / outlet water box 10. One end of the cooling water outlet pipe 11 and the cooling water inlet pipe 12 extends out of the end cap. The cooling water outlet pipe 11 is connected to the outlet chamber, and the cooling water inlet pipe 12 is connected to the inlet chamber.

[0040] Both sides of the inner side of the cylinder 1 are fixedly connected with folding plates 15. The folding plates 15 are "L" shaped plates. A side groove is formed between the folding plates 15 and the inner wall of the cylinder 1. A second oil return pipe 14 is fixedly connected to the side of the cylinder 1. One end of the second oil return pipe 14 is connected to the side groove.

[0041] The cylinder 1 is also equipped with a purging mechanism 4, which is located above all the heat exchange tubes 7. The purging mechanism 4 is used to blow the lubricating oil floating on the refrigerant into the side groove so that the lubricating oil can be returned to the compressor. At the same time, it avoids the lubricating oil from staying inside the cylinder 1 for a long time, causing it to adhere to the tube wall of the heat exchange tube 7, thus avoiding a reduction in the heat exchange efficiency of the heat exchange tube 7.

[0042] Connect the refrigerant inlet 2 to the condenser, connect the refrigerant outlet 3 to the compressor, and connect the cooling water outlet pipe 11 and the cooling water inlet pipe 12 to the external cooling system. The cooling system delivers hot cooling water to the heat exchange tube 7 through the cooling water inlet pipe 12. After the hot cooling water flows into the return water box 13, it returns to the outlet chamber from the heat exchange tube 7 in other parts, and finally returns to the cooling system from the cooling water outlet pipe 11. During the process, the compressor sends the gaseous refrigerant to the condenser, which condenses the gaseous refrigerant into liquid and delivers it to the cylinder 1 through the refrigerant inlet 2. The liquid refrigerant exchanges heat with the hot cooling water in the heat exchange tube 7, so that the cooling water returning from the cooling water outlet pipe 11 becomes cooling water at a lower temperature. At the same time, the refrigerant after heat exchange will vaporize again and then be drawn out by the compressor from the refrigerant outlet 3, thus forming a cycle and achieving cooling of the cooling water.

[0043] During this process, the purging mechanism 4 will continuously blow the lubricating oil floating on the surface of the refrigerant into the side groove, so as to avoid the lubricating oil remaining in the cylinder 1 for a long time and to avoid the lubricating oil adhering to the tube wall of the heat exchange tube 7, thereby avoiding the reduction of the heat exchange efficiency of the heat exchange tube 7.

[0044] like Figures 2-8 As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller unit. In this embodiment, the purging mechanism 4 includes a transfer gas box 411 fixedly installed on the side of the right sealing plate 8 / left sealing plate 5. In this embodiment, the transfer gas box 411 is installed on the right sealing plate 8, and two purging pipes 45 are rotatably installed on the transfer gas box 411. One end of the two purging pipes 45 is rotatably installed on the left sealing plate 5 / right sealing plate 8, and both purging pipes 45 are connected to the transfer gas box 411. Each of the two purging pipes 45 has several air holes 417. A gas replenishment mechanism is fixedly installed on the side of the transfer gas box 411. The gas replenishment mechanism is used to replenish gas into the transfer gas box 411. The gas in the transfer gas box 411 enters the two purging pipes 45 and is blown out from the air holes 417.

[0045] The purging mechanism 4 also includes a drive mechanism, which is installed on the side of the left sealing plate 5 / right sealing plate 8. The drive mechanism is used to drive the two purging pipes 45 to rotate synchronously in opposite directions, so that the gas blown out from the air hole 417 can drive the lubricating oil on the refrigerant into the side groove.

[0046] like Figures 2-8As shown, this invention provides a high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit. In this embodiment, the gas replenishment mechanism includes a gas replenishment cylinder 48 fixedly installed on the side of the transfer gas box 411. A piston block 418 is slidably installed inside the gas replenishment cylinder 48. A piston rod 47 is fixedly connected to the side of the piston block 418 away from the transfer gas box 411. Four one-way valve assemblies 419 are provided on the gas replenishment cylinder 48, namely two inlet one-way valves and two outlet one-way valves. The piston block 418 has two inlet check valves and two outlet check valves located on both sides of the piston block 418. From left to right and from top to bottom, they are called the first inlet check valve, the second inlet check valve, the first outlet check valve, and the second outlet check valve. The air replenishment mechanism also includes an inlet pipe 49 and an outlet pipe 410. The inlet pipe 49 is connected to the two inlet check valves, and the outlet pipe 410 is connected to the two outlet check valves. One end of the outlet pipe 410 is connected to the transfer air box 411.

[0047] The air replenishment mechanism also includes a transmission mechanism, which is installed on the left sealing plate 5 / right sealing plate 8. One end of the transmission mechanism is connected to a purge pipe 45, and the other end of the transmission mechanism is connected to a piston rod 47. When the purge pipe 45 rotates, the transmission mechanism is used to drive the piston rod 47 to reciprocate.

[0048] When the piston rod 47 reciprocates, under negative pressure, one intake check valve opens and one exhaust check valve closes; under positive pressure, another intake check valve closes and another exhaust check valve opens. Therefore, the intake pipe 49 can draw gaseous refrigerant from the cylinder 1 and deliver it to the transfer air box 411 through the exhaust pipe 410. Finally, it is blown out from the air hole 417 on the purge pipe 45. Therefore, no matter whether the piston rod 47 moves to the right or to the left, the air replenishment mechanism will replenish air into the transfer air box 411, realizing uninterrupted purging of the lubricating oil and greatly improving the lubricating oil recovery efficiency.

[0049] Specifically, such as Figure 5 As shown, when the piston rod 47 moves to the right, the first intake check valve opens and the second intake check valve closes. The first exhaust check valve closes and the second exhaust check valve opens. External gas enters the air supply cylinder 48 through the first intake check valve, and the gas in the air supply cylinder 48 is discharged through the second exhaust check valve.

[0050] When the piston rod 47 moves to the left, the first intake check valve is closed and the second intake check valve is opened. The first exhaust check valve is opened and the second exhaust check valve is closed. External gas enters the air supply cylinder 48 through the second intake check valve, and the gas in the air supply cylinder 48 is discharged through the first exhaust check valve.

[0051] like Figures 5-7As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller unit. In this embodiment, the one-way valve assembly 419 includes a valve body 4191 fixedly connected to the air supply cylinder 48. The valve body 4191 has an air passage 4192 communicating with the interior of the air supply cylinder 48. The interior of the valve body 4191 also has an installation cavity 4195 communicating with the air passage 4192. A fixing ring 4193 communicating with the air passage 4192 is fixedly connected to the side wall of the installation cavity 4195. A movable baffle 4194 is hinged to the side of the fixing ring 4193. In its natural state, the movable baffle 4194 hangs down naturally and blocks the fixing ring 4193.

[0052] The inlet check valve and the outlet check valve have similar structures, except for the orientation of the movable baffle 4194. In the inlet check valve, the movable baffle 4194 faces the inside of the air supply cylinder 48, while in the outlet check valve, the movable baffle 4194 faces the outlet pipe 410.

[0053] like Figures 2-3 As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller unit. In this embodiment, the transmission mechanism includes a reciprocating screw 46 rotatably mounted on the left sealing plate 5 / right sealing plate 8. One end of the reciprocating screw 46 is threadedly connected to a piston rod 47. A first drive gear 43 is fixedly mounted on the purge pipe 45, and a first driven gear 44 is fixedly mounted on the reciprocating screw 46. The first driven gear 44 and the first drive gear 43 are meshed together.

[0054] like Figure 2 As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller unit. In order to increase the air supply volume and blowing intensity of the air supply mechanism, in this embodiment, the diameter of the first driving gear 43 is 3 to 6 times the diameter of the first driven gear 44, so that the piston rod 47 can move faster, the air supply volume per unit time is greatly increased, and the purging effect is improved.

[0055] like Figures 2-3 As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller unit. In this embodiment, the drive mechanism includes a motor 412 fixedly mounted on the left sealing plate 5 / right sealing plate 8. The output shaft of the motor 412 is fixedly connected to a second drive gear 413. One end of each of the two purge pipes 45 is fixedly connected to a second driven gear 414. The second drive gear 413 meshes with one of the second driven gears 414. Two meshing intermediate gears 415 are rotatably mounted on the side of the left sealing plate 5 / right sealing plate 8. The two intermediate gears 415 mesh with the two second driven gears 414 respectively.

[0056] like Figures 2-4 and Figure 8 As shown, this invention provides a high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit. When the refrigerant boils, some lubricating oil may be carried into the compressor by the gaseous refrigerant, causing some lubricating oil to participate in the circulation again. This leads to an increase in the adhesion rate of lubricating oil to the heat exchange tube 7. Therefore, in this embodiment, an oil storage tank 41 is fixedly installed on the side of the left sealing plate 5 / right sealing plate 8. One end of each of the two purge pipes 45 extends into the oil storage tank 41. The side of the oil storage tank 41 is connected to a first oil return pipe 42. One end of the first oil return pipe 42 extends out of the end cap. A vent 416 is fixedly installed inside each purge pipe 45. The vent 416 is made of a breathable membrane material. The vent 416 is shaped like a horizontal frustum. The large diameter end of the vent 416 faces the oil storage tank 41, and the small diameter end of the vent 416 is connected to the transfer air box 411.

[0057] After the gaseous refrigerant is drawn from the cylinder 1 through the inlet pipe 49, it will be transported to the vent pipe 416 through the air supply pipe 48, the outlet pipe 410 and the transfer air box 411. The gaseous refrigerant will enter the purge pipe 45 through the vent pipe 416 and be discharged from the air hole 417. The liquid lubricating oil will remain in the vent pipe 416. Since the vent pipe 416 is a horizontally placed frustum shape and the bottom section of the vent pipe 416 is inclined downward, the lubricating oil will flow into the oil storage tank 41 along the vent pipe 416, thereby improving the effect of intercepting lubricating oil and reducing the lubricating oil adhesion rate.

[0058] When the oil tank 41 is full of lubricating oil, or during the working interval of the refrigeration unit, the lubricating oil in the oil tank 41 can be reintroduced into the compressor from the first oil return pipe 42.

[0059] like Figure 10 As shown, this invention provides a high-efficiency full-liquid evaporator for a magnetic levitation variable frequency chiller. To prevent the boiling refrigerant from being blown into the side tank, which could cause the refrigerant to re-condense into a liquid state in the side tank, resulting in the refrigerant being drawn out along with the lubricating oil, thus reducing the amount of refrigerant and the cooling efficiency, in this embodiment, multiple heat exchange tubes 7 pass through the side tank.

[0060] After the refrigerant enters the side channel, the multiple heat exchange tubes 7 will also exchange heat with the refrigerant in the side channel, thereby causing the refrigerant to re-vaporize and then escape from the side channel, preventing the refrigerant from being drawn out.

[0061] like Figures 2-3 and Figure 9As shown, this invention provides a high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit. After liquid refrigerant is introduced into the cylinder 1 through refrigerant inlet 2, a liquid layer forms at the bottom of the cylinder 1. The liquid layer exchanges heat with the cooling water in the heat exchange tube 7, eventually forming a boiling state at the top of the liquid layer, and then vaporizing. However, in the vicinity of refrigerant inlet 2, because a lower temperature liquid refrigerant is continuously introduced from refrigerant inlet 2, the lower temperature liquid refrigerant mixes with the original high temperature liquid refrigerant in the cylinder 1, resulting in a relatively low temperature of the liquid layer near refrigerant inlet 2. This reduces the boiling effect of the liquid layer above refrigerant inlet 2, decreases the amount of refrigerant vaporization, and will affect the operation of the equipment. Efficiency is reduced. Therefore, in this embodiment, a preheating component 6 is also installed at the bottom of the cylinder 1. The preheating component 6 includes a horizontal partition 61 fixedly installed inside the cylinder 1. Several vertical partitions 64 are fixedly connected to the bottom of the horizontal partition 61. Multiple heat exchange tubes 7 pass through the multiple vertical partitions 64. An upper flow channel 62 is opened at the top of each of the multiple vertical partitions 64, and a lower flow channel 63 is opened at the bottom of the other vertical partitions 64. The multiple upper flow channels 62 and multiple lower flow channels 63 are staggered, thereby forming a wave-shaped water channel between the multiple vertical partitions 64. The refrigerant inlet 2 is connected to one end of the water channel, and the end of the horizontal partition 61 away from the refrigerant inlet 2 is provided with a water outlet 65 connected to the water channel.

[0062] When refrigerant is introduced into the cylinder 1 through the refrigerant inlet 2, the liquid refrigerant flows along the water channel. The heat exchange tube 7 that runs through the water channel exchanges heat with the refrigerant, thereby preheating the liquid refrigerant. When the refrigerant flows out from the outlet 65, the liquid refrigerant forms a liquid layer above the partition plate 61. This liquid layer can fully exchange heat with other heat exchange tubes 7 and is no longer neutralized by the subsequent low-temperature refrigerant, allowing the liquid layer to fully boil, greatly improving the vaporization efficiency and the working efficiency of the equipment.

[0063] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit, comprising a cylindrical body, a refrigerant inlet at the bottom of one end of the cylindrical body, a refrigerant outlet at the top of the other end of the cylindrical body, a left sealing plate and a right sealing plate fixedly installed at both ends of the interior of the cylindrical body, a plurality of heat exchange tubes installed between the left and right sealing plates, a return water box fixedly connected to the side of the left sealing plate opposite to the right sealing plate, and an inlet / outlet water box fixedly connected to the side of the right sealing plate opposite to the left sealing plate, the return water box and the inlet / outlet water box respectively communicating with both ends of all the heat exchange tubes, a partition plate fixedly connected inside the inlet / outlet water box, the partition plate dividing the interior of the inlet / outlet water box into an inlet chamber and an outlet chamber, both of the inlet chamber and the outlet chamber communicating with the heat exchange tubes, and corresponding cooling water outlet pipes and cooling water inlet pipes provided on the sides of the inlet / outlet water box, characterized in that... Both sides of the cylinder are fixedly connected to folding plates, and a side groove is formed between the folding plates and the inner wall of the cylinder. A second oil return pipe is fixedly connected to the side of the cylinder, and one end of the second oil return pipe is connected to the side groove. The cylinder is also equipped with a purging mechanism located above all the heat exchange tubes. The purging mechanism is used to blow the lubricating oil floating on the refrigerant into the side groove. The purging mechanism includes a transfer air box fixedly installed on the side of the right / left sealing plate. Two purging pipes are rotatably installed on the transfer air box. One end of each purging pipe is rotatably installed on the left / right sealing plate. Both purging pipes are connected to the transfer air box. Each purging pipe has several air holes. A replenishing air mechanism is fixedly installed on the side of the transfer air box. The replenishing air mechanism is used to replenish air into the transfer air box. The purging mechanism also includes a drive mechanism, which is installed on the side of the left / right sealing plate and is used to drive the two purging pipes to rotate synchronously in opposite directions. The air replenishment mechanism includes an air replenishment cylinder fixedly installed on the side of the transfer air box. A piston block is slidably installed inside the air replenishment cylinder. A piston rod is fixedly connected to the side of the piston block away from the transfer air box. The air replenishment cylinder is provided with four one-way valve assemblies, namely two inlet one-way valves and two outlet one-way valves. One inlet one-way valve and one outlet one-way valve are located on the same side of the piston block. The air replenishment mechanism also includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the two inlet one-way valves, and the outlet pipe is connected to the two outlet one-way valves. One end of the outlet pipe is connected to the transfer air box. The air replenishment mechanism also includes a transmission mechanism, which is installed on the left / right sealing plate. When the purge pipe rotates, the transmission mechanism drives the piston rod to reciprocate.

2. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 1, characterized in that, The one-way valve assembly includes a valve body fixedly connected to the air supply cylinder. The valve body has an air passage communicating with the inside of the air supply cylinder. The valve body also has an installation cavity communicating with the air passage. A fixing ring communicating with the air passage is fixedly connected to the side wall of the installation cavity. A movable baffle is hinged to the side of the fixing ring. In its natural state, the movable baffle hangs down naturally and blocks the fixing ring.

3. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 1, characterized in that, The transmission mechanism includes a reciprocating screw rotatably mounted on the left / right sealing plate. One end of the reciprocating screw is threadedly connected to the piston rod. A first drive gear is fixedly mounted on the purge pipe, and a first driven gear is fixedly mounted on the reciprocating screw. The first driven gear and the first drive gear are meshed together.

4. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 3, characterized in that, The diameter of the first driving gear is 3 to 6 times the diameter of the first driven gear.

5. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 1, characterized in that, The drive mechanism includes a motor fixedly mounted on the left / right sealing plate. The output shaft of the motor is fixedly connected to a second drive gear. One end of each of the two purge pipes is fixedly connected to a second driven gear. The second drive gear meshes with a second driven gear. Two meshing intermediate gears are rotatably mounted on the side of the left / right sealing plate. The two intermediate gears mesh with the two second driven gears respectively.

6. The high-efficiency flooded evaporator for a magnetic levitation variable frequency chiller unit according to claim 1, characterized in that, An oil storage tank is fixedly installed on the side of the left / right sealing plate. One end of each of the two purge pipes extends into the oil storage tank. The side of the oil storage tank is connected to the first return oil pipe. A vent is fixedly installed inside each purge pipe. The vent is made of breathable membrane material and is shaped like a horizontal frustum. The large diameter end of the vent faces the oil storage tank, and the small diameter end of the vent is connected to the transfer air box.

7. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 1, characterized in that, Multiple heat exchange tubes pass through the side groove.

8. The high-efficiency flooded evaporator for magnetic levitation variable frequency chiller units according to claim 1, characterized in that, A preheating assembly is also installed at the bottom of the cylinder. The preheating assembly includes a horizontal partition plate fixedly installed inside the cylinder. Several vertical partition plates are fixedly connected to the bottom of the horizontal partition plate. Multiple heat exchange tubes pass through the multiple vertical partition plates. An upper flow channel is opened at the top of each of the multiple vertical partition plates, and a lower flow channel is opened at the bottom of the other vertical partition plates. The multiple upper flow channels and multiple lower flow channels are staggered, forming a wave-shaped water channel between the multiple vertical partition plates. The refrigerant inlet is connected to one end of the water channel, and an outlet connected to the water channel is opened at the end of the horizontal partition plate away from the refrigerant inlet.

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