Explosion-proof centrifugal chiller with timed automatic multi-point lubricating oil replenishment function

Abstract

The present invention discloses an explosion-proof centrifugal chiller with a function of timing and automatically replenishing lubricating oil at multiple points. The chiller comprises an evaporator, a centrifugal compressor, a condenser and a throttling device which are connected in sequence through a refrigerant pipe group, and an explosion-proof structure is arranged on the centrifugal compressor; the centrifugal compressor comprises a second gear box, a first gear box and a volute, a low-speed rotating shaft and a high-speed rotating shaft are arranged in the first gear box, a large gear is sleeved on the low-speed rotating shaft, and a small gear is sleeved on the high-speed rotating shaft; a rotating rod with one end fixedly connected to the large gear is arranged on the end surface of the large gear, and a first transmission assembly driven by the rotating rod is arranged in the first gear box; an oil storage tank and a transfer box connected to the storage tank through a heat dissipation pipe are arranged in the first gear box, and a cooling device for cooling the lubricating oil is arranged in the first gear box; the present invention indirectly performs timing through the number of rotations of the low-speed rotating shaft, thereby realizing the function of automatically replenishing the lubricating oil at multiple points according to the number of rotations.

Description

Technical Field

[0001] The invention relates to the technical field of chillers, in particular to an explosion-proof centrifugal chiller with a function of timing and automatically replenishing lubricating oil at multiple points. Background Art

[0002] In the refrigeration industry, chillers are divided into air-cooled chillers and water-cooled chillers. According to the compressor, they are divided into screw chillers, vortex chillers, and centrifugal chillers. In terms of temperature control, they are divided into low-temperature industrial chillers and normal-temperature chillers. The temperature of normal-temperature chillers is generally controlled within the range of 0℃-35℃, and the temperature of low-temperature chillers is generally controlled within the range of 0℃ to -100℃.

[0003] Chillers are also called freezers, refrigeration units, ice water units, cooling equipment, etc. They are widely used in various industries, so the requirements for chillers are also different. Its working principle is to achieve a refrigeration cycle by compressing liquid vapor or absorbing heat.

[0004] The rotors in centrifugal chillers rotate centrifugally for a long time and require lubrication from a lubricating oil system for long-term operation. However, current lubricating oil addition is either too frequent, resulting in lubricating oil waste, or the lubrication interval is too long, resulting in insufficient lubrication, affecting the centrifugation of the rotor and thus the normal refrigeration of the chiller.

[0005] Therefore, the present invention designs an explosion-proof centrifugal chiller with a timed automatic multi-point lubricating oil replenishment function to optimize the above-mentioned problem. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an explosion-proof centrifugal chiller with the function of timing and automatically replenishing lubricating oil at multiple points.

[0007] The technical solution of the present invention is: an explosion-proof centrifugal chiller with a function of timing and automatically replenishing lubricating oil at multiple points, comprising an evaporator, a centrifugal compressor, a condenser and a throttling device which are sequentially connected through a refrigerant pipe group to form a circulation path, and an explosion-proof structure is provided on the centrifugal compressor;

[0008] The centrifugal compressor comprises a second gearbox, a first gearbox fixedly connected to the second gearbox, and a volute fixedly connected to the first gearbox, a low-speed rotating shaft and a high-speed rotating shaft are arranged in the first gearbox, one end of the low-speed rotating shaft passes through the connecting side wall of the second gearbox and the first gearbox, one end of the low-speed rotating shaft is sleeved with a first bearing arranged on the inner wall of the second gearbox and passes through the inner wall of the second gearbox to be connected with the output shaft of the motor, and the low-speed rotating shaft is rotatably connected with the second bearing arranged on the connecting side wall, two ends of the high-speed rotating shaft are rotatably connected with the inner wall of the first gearbox through a third bearing, and one end of the high-speed rotating shaft close to the volute passes through the connecting side wall of the first gearbox and the volute and is sleeved with an impeller arranged in the volute; and a large gear is sleeved on the low-speed rotating shaft, and a small gear meshing with the large gear is sleeved on the high-speed rotating shaft;

[0009] A rotating rod with one end fixedly connected to the large gear is provided on the end surface of the large gear, a first transmission assembly is provided in the first gear box, the first transmission assembly includes a slide groove fixedly connected to the inner wall of the first gear box and a tooth plate slidably connected to the slide groove; a first gear meshing with the tooth plate of the first transmission assembly is provided on the inner wall of the first gear box, a limit frame fixedly connected to the tooth plate of the first transmission assembly is provided on the tooth plate of the first transmission assembly, and the other end of the rotating rod is clamped with the limit frame through a clamping block;

[0010] An oil storage tank is provided on the top of the first gearbox, a transfer box for conveying lubricating oil to various lubrication points is provided on the first gearbox located above the second bearing, an oil outlet pipe connected to the oil storage tank is provided at the bottom, a heat dissipation pipe connected to the oil outlet pipe is provided on one side of the oil outlet pipe, a first piston for opening and closing the heat dissipation pipe and slidably sealedly connected to the oil outlet pipe is provided at one end of the first gear plate, the other end of the heat dissipation pipe is connected to the transfer box, and a cooling device for cooling the lubricating oil is provided in the first gearbox;

[0011] A second gear is provided at the rear side of the first gear and is meshed vertically therewith, and the second gear is rotatably connected to the bottom of the first gear box, a baffle with a first through hole is fixedly provided in the heat dissipation tube, and a second ratchet for separating the heat dissipation tube into two parts of the tube body is provided on the heat dissipation tube on one side of the baffle, and the two ends of the second ratchet are respectively rotatably sealed and connected to the two parts of the tube body of the heat dissipation tube, the second ratchet is rotatably sealed and connected to the baffle, and a second through hole is provided on the end face of the second ratchet for rotatably docking or misaligning with the first through hole to control the flow of lubricating oil; a first ratchet is provided below the second ratchet and is meshed with the second gear for transmission, the first ratchet is meshed vertically with the second gear, and the first ratchet is rotatably connected to the inner wall of the first gear box.

[0012] Furthermore, the first bearing, the second bearing and the third bearing are all bearings with sealing rings, and the outer rings of the first bearing, the second bearing and the third bearing are all provided with oil inlet holes and oil outlet holes. The bottom of the transfer box is provided with a T-shaped tube whose upper end is connected thereto, and the left and right ends of the T-shaped tube are respectively connected to the first branch pipe connected to the oil inlet hole of the first bearing and the second branch pipe connected to the oil inlet hole of the second bearing. The oil outlet hole of the second bearing is connected to the oil inlet hole of the third bearing located below the second bearing through the third branch pipe, the two oil outlet holes of the third bearings are connected in sequence through the fourth branch pipe and the first oil pump, and the oil outlet hole of the first bearing is connected to the third branch pipe through the fifth branch pipe.

[0013] Description: Connect various lubrication points through multiple branch pipes such as T-tubes, so that the lubricating oil can gradually flow to each lubrication point with gravity, realizing the function of multi-point lubricating oil replenishment.

[0014] Furthermore, a first spray head for spraying lubricating oil onto the meshing point of the large gear and the small gear is provided on one side of the third branch pipe, the first spray head is connected to the third branch pipe, the fifth branch pipe and the first spray head are located on the same horizontal line, and a slider is provided in the fifth branch pipe, the slider is slidably connected to the inner wall of the fifth branch pipe through a return spring, and a through hole is provided on the slider in the vertical direction.

[0015] Note: By setting the first spray head and the slider, when the lubricating oil in the fifth branch pipe flows to the third branch pipe, the slider can be pushed to squeeze part of the lubricating oil flowing from the second branch pipe to the third branch pipe into the first spray head and spray it out. When the amount of lubricating oil gradually decreases, the slider returns to the fifth branch pipe under the action of the return spring to prepare for the next squeezing of lubricating oil.

[0016] Furthermore, the cooling device comprises a cooling pipe surrounding the heat dissipation pipe and a cooling shell arranged on the inner wall of the first gear box, and a water inlet end and a water outlet end of the cooling pipe are respectively connected to two sides of the cooling shell;

[0017] A second transmission assembly having the same structure as the first transmission assembly and symmetrically arranged is provided on one side of the first gear, a first cooling plate vertically connected to the top of the cooling shell is provided in the cooling shell, a second cooling plate horizontally connected to the first cooling plate is provided below the first cooling plate, a plurality of flow holes are provided on the second cooling plate, and a second piston connected to the tooth plate of the second transmission assembly is provided at the bottom of the cooling shell.

[0018] Description: The gear plate of the second transmission assembly is used to adjust the flow of coolant in the cooling pipe, so that the coolant is transferred to the cooling shell after absorbing heat in the heat dissipation pipe, cooled by the cooling plate, and then circulated back to the outside of the heat dissipation pipe, thereby realizing circulating cooling of the heat dissipation pipe.

[0019] Furthermore, the oil inlet hole of the third bearing is connected to a recovery box arranged on the inner wall of the first gear box through the second oil pump and the recovery pipe in sequence. The recovery box is connected to the oil storage tank through the replenishing pipe. A liquid level sensor is provided on the side wall of the oil storage tank. The liquid level sensor controls the opening and closing of the valve provided in the replenishing pipe through the first controller.

[0020] Description: By setting up a recovery box, the excess lubricating oil that has not been consumed by bearing wear can be recovered as a supply to the oil storage tank. When the oil level in the oil storage tank is low, the recovered lubricating oil can be used to replenish the oil storage tank through the recovery box, thereby reducing the waste of lubricating oil.

[0021] Furthermore, a second spray head facing the first ratchet wheel is provided between the second oil pump and the recovery pipe.

[0022] Note: By providing a second spray head, the first ratchet wheel can be sprayed with lubricating oil during the recovery process, so that the lubricating oil can lubricate components such as the transmission assembly.

[0023] Furthermore, the explosion-proof structure includes a cover body mounted on the centrifugal compressor, an airbag is provided between the cover body and the centrifugal compressor, a plurality of buffer springs are provided between the airbag and the cover body, and an alarm driven by the buffer springs is provided between the buffer springs and the cover body.

[0024] Description: By setting up the cover body and the airbag, the airbag can first wrap and cushion the fragments and impact force generated by the explosion of the chiller to prevent direct damage to the cover body, and the buffer spring can have a certain buffering effect on the impact force. In the process of the airbag absorbing and gradually expanding, the buffer spring is squeezed. When it is squeezed to the point that the airbag cannot completely absorb it, the alarm is triggered to remind the user to deal with it in time.

[0025] Furthermore, cooling water is provided in the airbag, a spray port connected to the airbag is provided on the side wall of the first gear box, a third gear for rotating to open and close the spray port is provided on the inner wall of the first gear box, a pressure sensor is provided on the inner wall of the first gear box located on one side of the third gear, and a fourth gear driven by a rotating motor controlled by a second controller is provided on the pressure sensor, and the fourth gear is meshed with the third gear for transmission.

[0026] Description: By installing cooling water in the airbag, when the pressure of the pressure sensor gradually increases, the fourth gear drives the third gear to rotate and open the spray port, thereby spraying the space under higher pressure, thereby reducing the temperature and preventing the space from exploding due to excessive air pressure.

[0027] Furthermore, the inner surface of the cover is coated with a heat absorbing coating, and the heat absorbing coating is a zirconia-based ceramic material.

[0028] Note: By providing a heat-absorbing coating, the protective effect of the cover on the chiller can be enhanced by absorbing heat.

[0029] The beneficial effects of the present invention are:

[0030] (1) The explosion-proof centrifugal chiller of the present invention is provided with a rotating rod and a first transmission assembly connected to the large gear, and the lubricating oil is transferred from the oil storage tank to the transfer tank in small quantities and multiple times through the rotation of the low-speed rotating shaft, so as to lubricate each bearing, and the lubricating oil is provided regularly through the number of rotations of the low-speed rotating shaft.

[0031] (2) The explosion-proof centrifugal chiller of the present invention is provided with a second ratchet and a first gear, and the first gear is caused to reciprocate by the movement of the first transmission component, thereby realizing one-way transmission of the second ratchet, so that the second ratchet rotates continuously, thereby intermittently opening the heat dissipation pipe, and realizing the effect of automatically and regularly replenishing the lubricating oil.

[0032] (3) The explosion-proof centrifugal chiller of the present invention improves the safety of the chiller and reduces the risk of explosion of the chiller by providing an explosion-proof structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the overall structural cycle diagram of the chiller of the present invention;

[0034] Figure 2 This is the overall appearance of the centrifugal compressor of the chiller of the present invention;

[0035] Figure 3 This is an internal structure diagram of a centrifugal compressor for a chiller according to an embodiment of the present invention;

[0036] Figure 4 is a longitudinal section of the volute of the centrifugal compressor of the chiller of the present invention;

[0037] Figure 5 This is a diagram showing the internal structure of the first gearbox of the centrifugal compressor of the chiller of the present invention;

[0038] Figure 6 It is a diagram showing the internal structure of the cooling shell of the centrifugal compressor of the chiller of the present invention;

[0039] Figure 7 It is a separation structure diagram of the heat dissipation pipe of the centrifugal compressor of the chiller of the present invention;

[0040] Figure 8 It is the internal structure diagram of the heat dissipation pipe of the centrifugal compressor of the chiller of the present invention;

[0041] Fig. 9 This is an internal structure diagram of a centrifugal compressor for a chiller according to Embodiment 2 of the present invention;

[0042] Fig.10 It is a distribution structure diagram of the slider of the centrifugal compressor of the chiller of the present invention;

[0043] Fig.11 This is a diagram showing the internal structure of the housing of the centrifugal compressor of the chiller according to the second embodiment of the present invention;

[0044] Among them, 1-second gear box, 11-low speed shaft, 111-large gear, 112-rotating rod, 2-first gear box, 21-high speed shaft, 211-small gear, 22-recovery box, 221-recovery pipe, 222-second sprinkler head, 223-supplementary pipe, 23-transfer box, 231-T-tube, 232-first branch pipe, 233-second branch pipe, 234-third branch pipe, 235-fourth branch pipe, 236-fifth branch pipe, 2361-slider, 237-first sprinkler head, 24 -slide groove, 241-tooth plate, 242-limiting frame, 243-first gear, 244-second ratchet, 245-first ratchet, 246-second gear, 247-heat dissipation pipe, 2471-baffle, 25-oil storage tank, 251-oil outlet pipe, 252-cooling shell, 2521-first cooling plate, 2522-second cooling plate, 26-cover body, 261-air bag, 262-buffer spring, 263-third gear, 264-fourth gear, 265-third sprinkler head, 3-volute. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention.

[0046] Example 1

[0047] Explosion-proof centrifugal chillers with timed automatic multi-point lubricating oil replenishment function, such as Figure 1 As shown, it includes an evaporator, a centrifugal compressor, a condenser and a throttling device which are sequentially connected through a refrigerant pipe group to form a circulation path, the evaporator, the condenser and the throttling device are all commercially available, one end of the evaporator is connected to the air intake of the centrifugal compressor through a refrigerant pipe, the exhaust port of the centrifugal compressor is connected to the inlet of the condenser through the refrigerant pipe, the outlet of the condenser is connected to the other end of the evaporator through the throttling device, and the centrifugal compressor is provided with an explosion-proof structure;

[0048] like Figure 3 As shown, the explosion-proof structure includes a cover body 26 sleeved on the centrifugal compressor, an air bag 261 is provided between the cover body 26 and the centrifugal compressor, a plurality of buffer springs 262 are provided between the air bag 261 and the cover body 26, and an alarm driven by the buffer spring 262 is provided between the buffer spring 262 and the cover body 26;

[0049] like Figure 2 and Figure 3 As shown, the centrifugal compressor includes a second gearbox 1, a first gearbox 2 fixedly connected to the second gearbox 1, and a volute 3 fixedly connected to the first gearbox 2 (the volute 3 and its internal components are centrifugal compression components used in commercially available single-stage centrifugal compressors, that is: the present invention uses the first gearbox 2 and the second gearbox 1 to replace the gearbox of the commercially available single-stage centrifugal compressor, and the remaining parts use existing components), the volute 3 is provided with an air intake port and an air exhaust port, the first gearbox 2 is provided with a low-speed rotating shaft 11 and a high-speed rotating shaft 21, the left end of the low-speed rotating shaft 11 passes through the connecting side wall of the second gearbox 1 and the first gearbox 2, and the low The left end of the low-speed rotating shaft 11 is sleeved with the first bearing provided on the inner wall of the second gear box 1 and penetrates the inner wall of the second gear box 1 and is connected to the motor output shaft. The motor is a commercially available motor and is fixedly connected to the second gear box 1, and the low-speed rotating shaft 11 is rotatably connected to the second bearing provided on the connecting side wall. The two ends of the high-speed rotating shaft 21 are rotatably connected to the inner wall of the first gear box 2 through the third bearing, and the right end of the high-speed rotating shaft 21 close to the volute 3 penetrates the connecting side wall of the first gear box 2 and the volute 3 and is sleeved with the impeller provided in the volute 3; and a large gear 111 is sleeved on the low-speed rotating shaft 11, and a small gear 211 meshing and transmitting with the large gear 111 is sleeved on the high-speed rotating shaft 21;

[0050] like Figure 3 and Figure 4 As shown, a rotating rod 112 with one end fixedly connected thereto is provided on the end surface of the large gear 111, a first transmission assembly is provided in the first gear box 2, and the first transmission assembly includes a slide groove 24 fixedly connected to the inner wall of the first gear box 2 and a tooth plate 241 slidably connected to the slide groove 24; a first gear 243 meshing with the tooth plate 241 of the first transmission assembly is provided on the inner wall of the first gear box 2, a limit frame 242 fixedly connected thereto is provided on the tooth plate 241 of the first transmission assembly, and the other end of the rotating rod 112 is clamped with the limit frame 242 through a clamping block;

[0051] like Figure 3 and Figure 4 As shown, an oil storage tank 25 is provided on the top of the first gearbox 2, and a transfer box 23 for conveying lubricating oil to various lubrication points is provided on the first gearbox 2 located above the second bearing, and an oil outlet pipe 251 is provided at the bottom of the oil storage tank 25 and connected thereto, and a heat dissipation pipe 247 is provided at one end of the oil outlet pipe 251 and connected thereto, and a first piston for opening and closing the heat dissipation pipe 247 and slidably sealedly connected to the oil outlet pipe 251 is provided at one end of the gear plate 241 of the first transmission assembly, and the other end of the heat dissipation pipe 247 is connected to the transfer box 23, and a cooling device for cooling the lubricating oil is provided in the first gearbox 2;

[0052] like Figure 3As shown, the first bearing, the second bearing and the third bearing are all bearings with sealing rings, and the bearings with sealing rings are commercially available bearings with model number 6316DDU, and the outer rings of the first bearing, the second bearing and the third bearing are all provided with oil inlet holes and oil outlet holes. The oil inlet holes hereinafter refer to the oil inlet holes located at Figure 2 The upper opening of the bearing shown, the oil outlet hole refers to the one located at Figure 2 The lower side of the bearing is opened, and the bottom of the transfer box 23 is provided with a T-shaped tube 231 whose upper end is connected thereto. The left and right ends of the T-shaped tube 231 are respectively connected to the first branch pipe 232 connected to the oil inlet hole of the first bearing and the second branch pipe 233 connected to the oil inlet hole of the second bearing. The oil outlet hole of the second bearing is connected to the oil inlet hole of the third bearing located below the second bearing through the third branch pipe 234. The two oil outlet holes of the third bearings are connected in sequence through the fourth branch pipe 235 and the first oil pump. The oil outlet hole of the first bearing is connected to the third branch pipe 234 through the fifth branch pipe 236.

[0053] like Figure 5 and Figure 6 As shown, the cooling device includes a cooling pipe 255 surrounding the heat dissipation pipe 246 and a cooling shell 252 arranged on the inner wall of the first gear box 2, and the water inlet end 254 and the water outlet end 253 of the cooling pipe 255 are respectively connected to the two sides of the cooling shell 252;

[0054] like Figure 5 and Figure 6 As shown, a second transmission assembly having the same structure as the first transmission assembly and symmetrically arranged is provided on the left side of the first gear 243, a first cooling plate 2521 vertically connected to the top of the cooling shell 252 is provided in the cooling shell 252, a second cooling plate 2522 horizontally connected to the first cooling plate 2521 is provided below the first cooling plate 2521, a plurality of flow holes are provided on the second cooling plate 2522, and a second piston connected to the toothed plate 241 of the second transmission assembly is provided at the bottom of the cooling shell 252;

[0055] like Figure 3 , Figure 7 and Figure 8As shown, a second gear 246 is provided at the rear side of the first gear 243 and is meshed vertically therewith, and the second gear 246 is rotatably connected to the bottom of the first gear box 2, a baffle 2471 with a first through hole is fixedly provided in the heat dissipation tube 247, and a second ratchet 244 for separating the heat dissipation tube 247 into two parts of the tube body is provided on the heat dissipation tube 247 on the oil inlet side of the baffle 2471, and the two ends of the second ratchet 244 are respectively rotatably sealed and connected to the two parts of the tube body of the heat dissipation tube 247, the second ratchet 244 is rotatably sealed and connected to the baffle 2471, and a second through hole is provided on the end face of the second ratchet 244 for rotatably docking or misaligning with the first through hole to control the circulation of lubricating oil; a first ratchet 245 is provided below the second ratchet 244 and is meshed with the second gear 246, and the first ratchet 245 is rotatably connected to the inner wall of the first gear box 2.

[0056] The working principle of the above explosion-proof centrifugal chiller with the function of timed automatic multi-point lubricating oil replenishment is as follows: when the chiller is in operation, the low-speed shaft 11 in the centrifugal compressor rotates at a low speed under the action of the motor, and the large gear 111 drives the small gear 211 to rotate, thereby driving the high-speed shaft 21 to rotate at a high speed;

[0057] When the low-speed shaft 11 rotates, the large gear 111 drives the rotating rod 112 to rotate. The rotating rod 112 drives the tooth plate 241 of the first transmission assembly to move back and forth up and down under the limiting action of the limiting frame 242 and the slide slot 24 of the first transmission assembly. Therefore, the tooth plate 241 of the first transmission assembly blocks the connecting port between the heat dissipation pipe 247 and the oil outlet pipe 251 by reciprocating up and down in the oil outlet pipe 251. The lubricating oil in the oil storage tank 25 continues to flow downward under the action of gravity. The tooth plate 241 allows part of the lubricating oil to intermittently enter the heat dissipation pipe 247 under the reciprocating motion, and the lubricating oil is transferred to the transfer box 23 through the heat dissipation pipe 247.

[0058] When the lubricating oil passes through the heat dissipation pipe 247, the tooth plate 241 of the second transmission assembly makes a reverse reciprocating up and down motion with the tooth plate 241 of the first transmission assembly due to the transmission effect of the first gear 243, thereby sucking and releasing the coolant in the cooling shell 252, so that the coolant enters the cooling shell 252 from the water outlet end of the cooling tube 255, flows through the first cooling plate 2521 in the cooling shell 252, and then passes through the flow holes of the second cooling plate 2522. Under the movement of the tooth plate 241 of the second transmission assembly, the coolant turns to pass through the flow holes of the second cooling plate 2522 and returns to the cooling tube 255 from the water inlet end of the cooling hook 255, thereby realizing a circulation flow of the coolant, thereby realizing the cooling of the lubricating oil in the heat dissipation pipe 247;

[0059] During the process of replenishing the lubricating oil, the first gear 243 drives the second gear 246 to rotate, and the second gear 246 drives the first ratchet 245 to rotate. Because the first gear 243 is performing a reciprocating reverse rotation, the first ratchet 245 also performs a reciprocating reverse rotation, and intermittently drives the second ratchet 244 to rotate, so that when the low-speed shaft 11 rotates, the second ratchet 244 intermittently rotates unidirectionally to gradually block the through hole of the baffle 2471 to close the circulation of the heat dissipation pipe 247; when the low-speed shaft 11 rotates multiple times until the next time to replenish the lubricating oil, the second through hole on the second ratchet 244 coincides with the first through hole of the baffle 2471, so that the lubricating oil in the heat dissipation pipe 247 can circulate, thereby achieving the effect of timely and automatic replenishment of the lubricating oil;

[0060] When the temperature inside the centrifugal compressor is too high and the pressure is too high to cause an explosion, the airbag 261 in the cover body 26 will first block the fragments and buffer part of the impact force, and then the buffer spring 262 will enhance the explosion-proof effect of the airbag 261. When the airbag 261 cannot support the impact, the alarm is triggered by squeezing the buffer spring 262, reminding the user to repair the chiller in time.

[0061] Example 2

[0062] This embodiment is different from Embodiment 1 in that Fig. 9 and Fig.10 As shown, a first spray head 237 for spraying lubricating oil to the meshing position of the large gear 111 and the small gear 211 is provided on one side of the third branch pipe 234, and the first spray head 237 is connected to the third branch pipe 234. The fifth branch pipe 236 and the first spray head 237 are located on the same horizontal line, and a slider 2361 is provided in the fifth branch pipe 236. The slider 2361 is slidably connected to the inner wall of the fifth branch pipe 236 through a return spring, and a through hole is provided on the slider 2361 in the vertical direction;

[0063] like Fig. 9 As shown, the oil inlet hole of the third bearing is connected to the recovery box 22 arranged on the inner wall of the first gear box 2 through the second oil pump and the recovery pipe 221 in sequence, and the recovery box 22 is connected to the oil storage tank 25 through the replenishing pipe 223. A liquid level sensor is provided on the side wall of the oil storage tank 25, and the liquid level sensor controls the opening and closing of the valve provided in the replenishing pipe 223 through the first controller; the liquid level sensor, the first controller and the valve are connected through conventional circuits and are all commercially available devices;

[0064] like Fig. 9 As shown, a second spray head 222 facing the first ratchet 246 is provided between the second oil pump and the recovery pipe 223 .

[0065] The working principle of this embodiment is different from that of the first embodiment in that the excess lubricating oil in the third bearing is recovered into the recovery tank 22 by the second oil pump and the recovery tank 221, thereby reducing the waste of lubricating oil and realizing the reusability of lubricating oil.

[0066] When the amount of lubricating oil in the oil storage tank 25 is low through the liquid level sensor and the replenishing pipe 223, the spare lubricating oil in the recovery tank 22 is sucked into the oil storage tank 25, and the lubricating oil is replenished at multiple points, thereby improving the lubrication effect.

[0067] Example 3

[0068] The difference between this embodiment and embodiment 1 is that the inner surface of the cover body 26 is coated with a heat absorbing coating, and the heat absorbing coating is a zirconium oxide-based ceramic material;

[0069] like Fig.11 As shown, cooling water is provided in the airbag 261, a third spray head 265 connected to the airbag 261 is provided on the side wall of the first gear box 2, a third gear 263 for rotating and opening and closing the third spray head 265 is provided on the inner wall of the first gear box 2, a pressure sensor is provided on the inner wall of the first gear box 2 located on one side of the third gear 263, and a fourth gear 264 driven by a rotating motor controlled by a second controller is provided on the pressure sensor, and the fourth gear 264 is meshed with the third gear 263 for transmission; the pressure sensor, the second controller, the rotating motor and the fourth gear 264 are connected by conventional circuits and are all commercially available devices.

[0070] The working principle of this embodiment is different from that of Embodiment 1 in that the zirconium oxide-based ceramic material is used as a heat-absorbing coating to improve the heat absorption of the centrifugal compressor, thereby enhancing the explosion-proof effect of the cover body 26 on the chiller; when the pressure in the first gear box 2 is relatively high, the pressure sensor instructs the rotation motor through the second controller to drive the fourth gear 264 to rotate with the change in pressure, thereby driving the third gear 263 to rotate and open the third spray head 265, so that the cooling water in the airbag 261 is released, thereby reducing the temperature and pressure in the first gear box 2, so that the pointer in the pressure sensor rotates, and the third gear 263 is driven to rotate through the fourth gear 264 to close the third spray head 265.

Claims

1. An explosion-proof centrifugal chiller with the function of automatically replenishing lubricating oil at multiple points at a time, characterized in that: It includes an evaporator, a centrifugal compressor, a condenser and a throttling device which are sequentially connected through a refrigerant pipe group to form a circulation path, and the centrifugal compressor is provided with an explosion-proof structure; The centrifugal compressor comprises a second gearbox (1), a first gearbox (2) fixedly connected to the second gearbox (1), and a volute (3) fixedly connected to the first gearbox (2); a low-speed rotating shaft (11) and a high-speed rotating shaft (21) are arranged in the first gearbox (2); one end of the low-speed rotating shaft (11) passes through a connecting side wall between the second gearbox (1) and the first gearbox (2); one end of the low-speed rotating shaft (11) is sleeved with a first bearing arranged on the inner wall of the second gearbox (1) and passes through the inner wall of the second gearbox (1) to be connected to the motor output shaft; the low-speed rotating shaft (11) is rotatably connected to the second bearing arranged on the connecting side wall; both ends of the high-speed rotating shaft (21) are rotatably connected to the inner wall of the first gearbox (2) via a third bearing; and one end of the high-speed rotating shaft (21) close to the volute (3) passes through the connecting side wall between the first gearbox (2) and the volute (3) and is The first gear box (2) is provided with a first gear (243) which is meshed with the toothed plate (241) of the first transmission assembly and is provided on the inner wall of the first gear box (2). The first gear box (2) is provided with a first gear (243) which is meshed with the toothed plate (241) of the first transmission assembly and is provided on the inner wall of the first gear box (2). The toothed plate (241) of the first transmission assembly is provided with a limit frame (242) which is fixedly connected to the toothed plate (241) of the first transmission assembly and is provided with a limit frame (242) which is fixedly connected to the toothed plate (241) of the first transmission assembly. The other end of the limit frame (242) of the first transmission assembly is clamped with the limit frame (242) through a clamping block. An oil storage tank (25) is provided on the top of the first gearbox (2), a transfer box (23) for conveying lubricating oil to various lubrication points is provided on the first gearbox (2) located above the second bearing, an oil outlet pipe (251) is provided at the bottom of the oil storage tank (25) and is connected thereto, a heat dissipation pipe (247) is provided on one side of the oil outlet pipe (251) and one end of the heat dissipation pipe is connected thereto, a first piston is provided at one end of the toothed plate (241) of the first transmission assembly and is used for opening and closing the heat dissipation pipe (247) and is slidably and sealingly connected to the oil outlet pipe (251), the other end of the heat dissipation pipe (247) is connected to the transfer box (23), and a cooling device for cooling the lubricating oil is provided in the first gearbox (2); A second gear (246) is provided at the rear side of the first gear (243) and meshes vertically therewith. The second gear (246) is rotatably connected to the bottom of the first gear box (2). A baffle (2471) having a first through hole is fixedly provided in the heat dissipation tube (247). A second ratchet (244) for separating the heat dissipation tube (247) into two tube bodies is provided on the heat dissipation tube (247) on one side of the baffle (2471). The two ends of the second ratchet (244) are respectively engaged with the heat dissipation tube (247). 7) are rotatably sealedly connected, the second ratchet (244) is rotatably sealedly connected to the baffle (2471), and a second through hole is provided on the end surface of the second ratchet (244) for rotatably docking or misaligning with the first through hole to control the flow of lubricating oil; a first ratchet (245) is provided below the second ratchet (244) for meshing and transmitting with the second ratchet (244), the first ratchet (245) is vertically meshed with the second gear (246), and the first ratchet (245) is rotatably connected to the inner wall of the first gear box (2).

2. The explosion-proof centrifugal chiller with the function of timing and automatic multi-point lubricating oil replenishment according to claim 1 is characterized in that: The first bearing, the second bearing and the third bearing are all bearings with sealing rings, and the outer rings of the first bearing, the second bearing and the third bearing are all provided with oil inlet holes and oil outlet holes. The bottom of the transfer box (23) is provided with a T-shaped tube (231) whose upper end is connected thereto. The left and right ends of the T-shaped tube (231) are respectively connected to a first branch tube (232) connected to the oil inlet hole of the first bearing and a second branch tube (233) connected to the oil inlet hole of the second bearing. The oil outlet hole of the second bearing is connected to the oil inlet hole of the third bearing located below the second bearing through a third branch tube (234). The two oil outlet holes of the third bearings are connected in sequence through a fourth branch tube (235) and a first oil pump. The oil outlet hole of the first bearing is connected to the third branch tube (234) through a fifth branch tube (236).

3. The explosion-proof centrifugal chiller with the function of timing and automatic multi-point lubricating oil replenishment according to claim 2 is characterized in that: A first spray head (237) for spraying lubricating oil onto the meshing position of the large gear (111) and the small gear (211) is provided on one side of the third branch pipe (234); the first spray head (237) is connected to the third branch pipe (234); the fifth branch pipe (236) and the first spray head (237) are located on the same horizontal line; a slider (2361) is provided in the fifth branch pipe (236); the slider (2361) is slidably connected to the inner wall of the fifth branch pipe (236) via a return spring; and a through hole is provided on the slider (2361) in a vertical direction.

4. The explosion-proof centrifugal chiller with the function of timing and automatic multi-point lubricating oil replenishment according to claim 1 is characterized in that: The cooling device comprises a cooling pipe (255) arranged around the heat dissipation pipe (247) and a cooling shell (252) arranged on the inner wall of the first gear box (2); a water inlet end (254) and a water outlet end (253) of the cooling pipe (255) are respectively connected to two sides of the cooling shell (252); A second transmission assembly having the same structure as the first transmission assembly and symmetrically arranged is provided on one side of the first gear (243); a first cooling plate (2521) vertically connected to the top of the cooling shell (252) is provided in the cooling shell (252); a second cooling plate (2522) horizontally connected to the first cooling plate (2521) is provided below the first cooling plate (2521); a plurality of flow holes are provided on the second cooling plate (2522); and a second piston connected to the tooth plate (241) of the second transmission assembly is provided at the bottom of the cooling shell (252).

5. The explosion-proof centrifugal chiller with the function of timing and automatic multi-point lubricating oil replenishment according to claim 1 is characterized in that: The oil inlet hole of the third bearing is connected to a recovery box (22) arranged on the inner wall of the first gear box (2) through a second oil pump and a recovery pipe (221) in sequence; the recovery box (22) is connected to an oil storage tank (25) through a replenishing pipe (223); a liquid level sensor is provided on the side wall of the oil storage tank (25); the liquid level sensor controls the opening and closing of a valve provided in the replenishing pipe (223) through a first controller.

6. The explosion-proof centrifugal chiller with the function of timing and automatically replenishing lubricating oil at multiple points according to claim 5, characterized in that: A second spray head (222) facing the first ratchet wheel (245) is provided between the second oil pump and the recovery pipe (221).

7. The explosion-proof centrifugal chiller with the function of timing and automatic multi-point lubricating oil replenishment according to claim 1, characterized in that: The explosion-proof structure comprises a cover body (26) sleeved on the centrifugal compressor, an air bag (261) is arranged between the cover body (26) and the centrifugal compressor, a plurality of buffer springs (262) are arranged between the air bag (261) and the cover body (26), and an alarm driven by the buffer springs (262) is arranged between the buffer springs (262) and the cover body (26).

8. The explosion-proof centrifugal chiller with the function of timing and automatically replenishing lubricating oil at multiple points according to claim 7, characterized in that: Cooling water is provided in the airbag (261); a third spray head (265) connected to the airbag (261) is provided on the side wall of the first gear box (2); a third gear (263) for rotating and opening and closing the third spray head (265) is provided on the inner wall of the first gear box (2); a pressure sensor is provided on the inner wall of the first gear box (2) located on one side of the third gear (263); and a fourth gear (264) driven by a rotating motor controlled by a second controller is provided on the pressure sensor; the fourth gear (264) is meshed with the third gear (263) for transmission.

9. The explosion-proof centrifugal chiller with the function of timing and automatically replenishing lubricating oil at multiple points according to claim 7, characterized in that: The inner surface of the cover body (26) is coated with a heat absorbing coating, and the heat absorbing coating is a zirconium oxide-based ceramic material.

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