Automatic lubrication maintenance device for frozen water pump bearing

Abstract

The utility model provides a kind of automatic lubrication maintenance device of refrigerated water pump bearing, it is related to lubrication maintenance technical field, including lubrication filling nozzle, the lubrication filling nozzle is selected according to the bearing of refrigerated water pump, so that it is adapted to the lubricating grease filling port of refrigerated water pump bearing end cover.The utility model has the advantages that: the inside of lubrication filling nozzle that lubricating grease is discharged at the end of lubrication maintenance device is provided with liquid level meter, the effective delivery of lubricating grease is detected, according to the data of detection and the data of preset distribution of lubricating grease are compared, according to the feedback of comparison result, when the inside of lubrication filling nozzle is insufficient, control miniature air pump is pumped into high pressure gas in the inside of corresponding lubricating pipeline by air guide sealing seat and open-close sealing sheet, high pressure environment is formed in the inside of corresponding lubricating pipeline using high pressure gas, residual or sticky lubricating grease in the inside of lubricating pipeline is cleaned and driven, while ensuring the effective export of lubricating grease, avoid sticking, ensure the stability of lubrication.

Description

Technical Field

[0001] This utility model relates to the field of lubrication and maintenance technology, and in particular to an automatic lubrication and maintenance device for chilled water pump bearings. Background Technology

[0002] In HVAC systems of various industrial production facilities and commercial and residential buildings, chilled water pumps play a crucial role, driving the circulation of chilled water within the system to achieve cooling or heating functions. The bearings of these pumps are key components, directly affecting their operational stability and lifespan. Regular lubrication is essential to ensure the proper functioning of the chilled water pump bearings. Good lubrication reduces friction between bearing components, lowers wear, effectively extends bearing life, and thus ensures the stable operation of the chilled water pump and the entire system. Traditional lubrication maintenance largely relies on manual operation; however, with the development of automation technology, some chilled water pumps are beginning to be equipped with automatic lubrication devices.

[0003] However, in existing automatic lubrication and maintenance devices for chilled water pump bearings, grease is prone to remain in the pipeline or stick to the inner wall of the pipeline during the grease delivery process, which affects the accuracy of grease distribution and the stability of subsequent lubrication. Utility Model Content

[0004] Therefore, the purpose of this utility model is to propose an automatic lubrication and maintenance device for chilled water pump bearings, so as to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0005] To achieve the above objectives, one embodiment of this utility model provides an automatic lubrication and maintenance device for chilled water pump bearings, including a grease storage tank for storing grease. A metering dispenser for distributing grease is fixedly installed at one end of the grease storage tank via a sealing joint. A lubrication pipeline for conveying grease is fixedly installed around the circumference of the metering dispenser via a one-way valve. A lubrication nozzle for discharging grease is fixedly installed at one end of the lubrication pipeline. The lubrication nozzle is selected according to the bearing of the chilled water pump to fit the grease filling port of the chilled water pump bearing end cap. A level gauge for detecting the added grease is fixedly installed inside the lubrication nozzle. The level gauge is signal-connected to a PLC controller. The PLC controller is signal-connected to a miniature air pump that pressurizes the grease delivery pressure. A gas guide sealing seat for distributing pressurized gas is fixedly installed at the output end of the miniature air pump. An opening and closing sealing plate for sealing the gas guide sealing seat is fixedly installed inside the gas guide sealing seat. A filling sealing cap for opening and closing control is fixedly installed at the bottom of the lubrication nozzle.

[0006] Preferably, as described in any of the above embodiments, a stainless steel filter screen for filtering impurities in the grease is installed at the outlet of the grease tank, and a pneumatic piston driven by a PLC controller is installed inside the metering dispenser.

[0007] The above technical solution is as follows: a stainless steel filter screen is installed at the outlet of the grease tank (made of stainless steel), and a pneumatic piston is built into the metering dispenser (made of aluminum alloy) and driven by a PLC controller. The stainless steel filter screen efficiently filters impurities in the grease, preventing impurities from entering the bearings and causing wear. The pneumatic piston accurately pushes the grease to achieve metered distribution, adapting to the lubrication needs of different models of chilled water pump bearings. The aluminum alloy dispenser is lightweight and corrosion-resistant, adapting to the chemical properties of the grease. The PLC drive realizes automated metered control without manual intervention, improving lubrication efficiency.

[0008] Preferably, in any of the above embodiments, the lubrication nozzle is provided with a one-way valve to prevent the backflow of grease in the bearing, the lubrication nozzle is provided with a mounting groove for fixing the liquid level gauge, and the bottom of the lubrication nozzle is provided with a closed storage groove located below the one-way valve.

[0009] The above technical solution is adopted as follows: the lubrication nozzle (made of brass) is equipped with a one-way valve (fluororubber valve core), and an internal mounting groove is opened to fix the level gauge (capacitive type). A closed storage groove is opened at the bottom, located below the one-way valve. The one-way valve prevents the backflow of lubricating grease in the bearing and ensures the lubrication effect. The level gauge detects the amount of lubricating grease in the nozzle in real time and provides accurate feedback to the PLC to determine whether pressure replenishment is needed to push out residual lubricating grease. The mounting groove provides a stable mounting base for the level gauge to ensure detection accuracy. The closed storage groove provides storage space for the barrier plate of the filling sealing cap and avoids blocking the lubricating grease outlet channel. The brass material is wear-resistant, has good sealing performance, and is suitable for long-term lubrication conditions.

[0010] Preferably, in any of the above embodiments, the gas guide sealing seat includes a gas distribution seat for connection and fixation and a sealing pipe joint for connecting and guiding gas. The gas distribution seat is fixedly installed at one end of the metering dispenser. Gas distribution pipes for conveying gas are provided at both ends of the gas distribution seat. A sealing pipe joint that is fixedly installed with a lubrication pipeline is fixedly installed at one end of the gas distribution pipe. One end of the sealing pipe joint is fixedly installed with the metering dispenser.

[0011] The above technical solution is adopted: the gas distribution seat (aluminum alloy material) of the gas guide sealing seat is fixed to one end of the metering distributor. The gas distribution seat is equipped with gas distribution tubes (PU material) at both ends. One end of the gas distribution tube is fixed with a sealing pipe joint (brass material, threaded connection), which is fixed to the lubrication pipeline and the metering distributor. The gas distribution seat evenly distributes the high-pressure gas of the micro air pump to each lubrication pipeline. The PU gas distribution tube has good flexibility and can adapt to the pipeline layout requirements. The sealing pipe joint ensures that there is no gas leakage and guarantees the pressure replenishment effect. The overall structure realizes the precise distribution and sealed delivery of high-pressure gas, providing power for cleaning residual grease in the pipeline.

[0012] Preferably, in any of the above embodiments, the micro air pump is fixedly installed at one end of the air distribution seat, and the micro air pump is located on one side of the metering dispenser.

[0013] The above technical solution is adopted as follows: a miniature air pump (oil-free silent type) is fixed at one end of the air distributor base and horizontally arranged on one side of the metering dispenser. It is connected to the PLC signal. The miniature air pump provides high-pressure gas to the lubrication pipeline to push out residual grease and avoid grease sticking to the inner wall, which would affect the subsequent dispensing accuracy. The oil-free design prevents gas from contaminating the grease. It operates silently and is suitable for industrial environments. The horizontal arrangement saves installation space and facilitates heat dissipation. It is directly fixed to the air distributor base to reduce gas transmission loss.

[0014] Preferably, in any of the above embodiments, the opening and closing sealing plate includes an electric sealing rod connected to a PLC controller signal and a sealing plate for sealing the gas distribution seat. The electric sealing rod is fixedly installed inside the gas distribution seat, and the output end of the electric sealing rod is fixedly installed with a sealing plate that moves inside the gas distribution seat.

[0015] The above technical solution is adopted as follows: the electric sealing rod (miniature electric push rod) for opening and closing the sealing plate is fixed inside the gas distribution seat, and the sealing plate (fluororubber material) is fixed at the output end of the sealing rod, which can fit the internal flow channel of the gas distribution seat. The PLC controls the electric sealing rod to drive the sealing plate to open and close precisely, realizing the gas on / off control of the corresponding gas distribution pipe. Gas is supplied only to the pipeline that needs pressure replenishment, saving energy. The fluororubber sealing plate is resistant to high pressure and has good sealing performance to prevent gas leakage. Precise positioning ensures that the sealing plate fits completely with the flow channel to avoid gas cross-contamination. The overall structure realizes selective control of gas distribution and adapts to the differentiated pressure replenishment needs of multiple pipelines and multiple bearings lubricated at the same time.

[0016] Preferably, in any of the above embodiments, the filling sealing cover includes an electric drive rod connected to a PLC controller signal and a baffle plate that seals the lubrication filling nozzle. The electric drive rod is fixedly installed inside the lubrication filling seat, and the output end of the electric drive rod is fixedly installed with a baffle plate that moves inside the lubrication filling seat.

[0017] The above technical solution involves: an electric drive rod (miniature electric push rod) for adding a sealing cap is fixed inside the lubrication nozzle; a baffle plate (made of fluororubber) is fixed to the output end of the drive rod and can be embedded in a closed storage groove. Before lubrication, the PLC controls the electric drive rod to retract, and the baffle plate is stored in the closed storage groove, without affecting the grease discharge. After lubrication, the drive rod extends, and the baffle plate blocks the lubrication nozzle outlet, forming a closed cavity. This allows the miniature air pump to generate sufficient pressure to push out residual grease during pressurization. The fluororubber baffle plate has good elasticity, adapts to the nozzle outlet profile, and provides a reliable seal. The electric drive enables automated control, eliminating the need for manual operation and improving maintenance convenience.

[0018] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows: 1. A level gauge is installed inside the grease filling nozzle at the end of the lubrication and maintenance device to detect the effective delivery amount of grease. The detected data is compared with the preset grease distribution data. Based on the feedback of the comparison results, when there is insufficient grease in the grease filling nozzle, a micro air pump is controlled to pump high-pressure gas into the corresponding lubrication pipeline through the air guide sealing seat and the opening and closing sealing plate. The high-pressure gas creates a high-pressure environment inside the corresponding lubrication pipeline to clean and drive the grease that is residual or stuck inside the lubrication pipeline. This ensures that the grease is effectively discharged while avoiding sticking, thus ensuring the stability of lubrication.

[0019] 2. A sealing cap is installed at the bottom of the lubrication nozzle to seal it. This effectively creates a sealed cavity inside the lubrication nozzle for storing and testing the grease. It also facilitates the use of high-pressure gas generated by the micro air pump to clean and drive the grease, thus improving the stability of grease cleaning.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure according to an embodiment of the present utility model; Figure 2 This is a cross-sectional fracture structure diagram of the lubrication nozzle according to an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the air-guiding sealing seat according to an embodiment of the present utility model; Figure 4 According to the embodiments of this utility model Figure 3 Enlarged structural diagram at point A; Among them: 1-grease storage tank, 2-quantitative dispenser, 3-lubrication pipeline, 4-lubrication filling nozzle, 5-level gauge, 6-mini air pump, 7-air guide sealing seat, 71-air distributor seat, 72-sealing pipe joint, 8-opening and closing sealing plate, 81-electric sealing rod, 82-sealing plate, 9-filling sealing cap, 91-electric drive rod, 92-barrier plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0023] like Figure 1-4 As shown in the figure, an automatic lubrication and maintenance device for a chilled water pump bearing according to an embodiment of the present invention includes a grease storage tank 1 for storing grease. A metering dispenser 2 for distributing grease is fixedly installed at one end of the grease storage tank 1 through a sealing joint. A lubrication pipeline 3 for conveying grease is fixedly installed on the circumference of the metering dispenser 2 through a one-way valve. A lubrication filling nozzle 4 for discharging grease is fixedly installed at one end of the lubrication pipeline 3. The lubrication filling nozzle 4 is selected according to the bearing of the chilled water pump to fit the grease filling port of the bearing end cap of the chilled water pump. A level gauge 5 for detecting the added grease is fixedly installed inside the lubrication filling nozzle 4. The level gauge 5 is connected to a PLC controller. The PLC controller is connected to a miniature air pump 6 for pressurizing the grease delivery pressure. A gas guide sealing seat 7 for distributing pressurized gas is fixedly installed at the output end of the miniature air pump 6. An opening and closing sealing plate 8 for sealing the gas guide sealing seat 7 is fixedly installed inside the gas guide sealing seat 7. A filling sealing cap 9 for opening and closing control is fixedly installed at the bottom of the lubrication filling nozzle 4.

[0024] Preferably, of any of the above schemes, a stainless steel filter screen for filtering impurities in the grease is installed at the outlet of the grease tank 1, and a pneumatic piston driven by a PLC controller is installed inside the metering dispenser 2.

[0025] The above technical solution is adopted as follows: a stainless steel filter screen is installed at the outlet of the grease tank 1 (stainless steel material), and a pneumatic piston is built into the metering dispenser 2 (aluminum alloy material), which is driven by a PLC controller. The stainless steel filter screen efficiently filters impurities in the grease, preventing impurities from entering the bearings and causing wear. The pneumatic piston accurately pushes the grease to achieve metered distribution, which can meet the lubrication requirements of different models of chilled water pump bearings. The aluminum alloy dispenser is lightweight and corrosion resistant, and can be adapted to the chemical properties of the grease. The PLC drive realizes automated metered control without manual intervention, thereby improving lubrication efficiency.

[0026] The filter screen filters and intercepts impurities through its pore size. The quantitative delivery principle is based on the stroke control of a pneumatic piston, with the delivery amount proportional to the stroke. The automatic control principle is based on the pulse signals of the PLC to drive the piston to move precisely. The corrosion resistance principle is based on the chemical stability of aluminum alloy and stainless steel to avoid reaction with the grease. The grease stored in the grease tank 1 enters the quantitative distributor 2 after being filtered by the filter screen. The PLC controls the pneumatic piston to move according to the preset amount, pushing a quantitative amount of grease to the lubrication pipeline 3. After lubrication is completed, the piston resets and waits for the next cycle. The filter screen is cleaned regularly (to prevent impurities from clogging it), and the piston positioning accuracy and the accuracy of the delivery amount are tested regularly.

[0027] Preferably, the lubrication nozzle 4 is provided with a one-way valve to prevent the grease in the bearing from flowing back, the lubrication nozzle 4 is provided with a mounting groove for fixing the liquid level gauge 5, and the bottom of the lubrication nozzle 4 is provided with a closed storage groove located below the one-way valve.

[0028] The above technical solution is adopted as follows: the lubrication nozzle 4 (made of brass) is equipped with a one-way valve (fluororubber valve core), and an internal mounting groove is opened to fix the level gauge 5 (capacitive type). A closed storage groove is opened at the bottom and located below the one-way valve. The one-way valve prevents the backflow of lubricating grease in the bearing and ensures the lubrication effect. The level gauge 5 detects the amount of lubricating grease in the nozzle in real time and provides accurate feedback to the PLC to determine whether pressure replenishment is needed to push out residual lubricating grease. The mounting groove provides a stable installation benchmark for the level gauge to ensure detection accuracy. The closed storage groove provides storage space for the barrier plate 92 of the filling sealing cover 9 and avoids blocking the lubricating grease outlet channel. The brass material is wear-resistant and has good sealing performance, which is suitable for long-term lubrication conditions.

[0029] The one-way valve core opens under the pressure of lubricating grease and closes when there is no pressure. The liquid level detection principle is based on the change of dielectric constant of the capacitive sensor to deduce the amount of lubricating grease. The precise installation principle is based on the size positioning of the mounting groove to ensure full contact between the sensor detection end face and the lubricating grease. The space storage principle is based on the structural design of the closed storage groove to achieve non-interference between the sealing cover and the outlet channel. The lubricating grease enters the lubrication filling nozzle 4 through the lubrication pipeline 3, opens the one-way valve and injects into the bearing. The liquid level gauge 5 detects the amount of remaining lubricating grease in the filling nozzle in real time. After lubrication is completed, the one-way valve closes. If the liquid level gauge detects that the residual amount exceeds the set value, it triggers the pressure replenishment program. The filling nozzle and one-way valve should be cleaned regularly (to prevent lubricating grease adhesion). The detection accuracy of the liquid level gauge and the sealing performance of the one-way valve should be tested regularly.

[0030] Preferably, in any of the above embodiments, the gas-guiding sealing seat 7 includes a gas distribution seat 71 for connection and fixation and a sealing pipe joint 72 for connecting and guiding gas. The gas distribution seat 71 is fixedly installed at one end of the metering distributor 2. Gas distribution pipes for conveying gas are provided at both ends of the gas distribution seat 71. A sealing pipe joint 72 that is fixedly installed with the lubrication pipeline 3 is fixedly installed at one end of the gas distribution pipe. One end of the sealing pipe joint 72 is fixedly installed with the metering distributor 2.

[0031] The above technical solution is adopted: the gas distribution seat 71 (aluminum alloy material) of the gas guide sealing seat 7 is fixed to one end of the metering distributor 2. The gas distribution seat is provided with gas distribution pipes (PU material) at both ends. One end of the gas distribution pipe is fixed with a sealing pipe joint 72 (brass material, threaded connection), which is fixed to the lubrication pipeline 3 and the metering distributor 2. The gas distribution seat 71 evenly distributes the high-pressure gas of the micro air pump 6 to each lubrication pipeline 3. The PU gas distribution pipe has good flexibility and can adapt to the pipeline layout requirements. The sealing pipe joint 72 ensures that there is no gas leakage and guarantees the pressure replenishment effect. The overall structure realizes the accurate distribution and sealed delivery of high-pressure gas, providing power for cleaning residual grease in the pipeline.

[0032] The internal flow channel design of the gas distributor seat ensures uniform gas distribution. The sealing connection principle is based on the threaded fastening of the pipe joint and the fit of the sealing ring to prevent gas leakage. The flexible delivery principle is based on the elastic properties of the PU tube, adapting to complex installation environments. The power transmission principle is based on the pressure potential energy of high-pressure gas, pushing the residual grease in the pipeline. When the pressure replenishment program is started, the micro air pump 6 generates high-pressure gas, and the gas distributor seat 71 distributes the gas to the corresponding gas distribution pipe. The gas enters the lubrication pipeline 3 through the sealed pipe joint 72, pushing the residual grease to the filling nozzle. After the pressure replenishment is completed, the air pump stops, and the pipeline is depressurized. Regularly check the sealing performance of the pipe joint (no gas leakage), and regularly test the uniformity of gas distribution and the pressure resistance of the pipeline.

[0033] Preferably, of any of the above schemes, the micro air pump 6 is fixedly installed at one end of the air distribution seat 71, and the micro air pump 8 is located on one side of the metering dispenser 2.

[0034] The above technical solution is adopted: the micro air pump 6 (oil-free silent type) is fixed at one end of the air distribution seat 71 and horizontally arranged on one side of the metering dispenser 2. It is connected to the PLC signal. The micro air pump provides high-pressure gas to the lubrication pipeline 3 to push the residual grease and avoid the grease from sticking to the inner wall and affecting the subsequent distribution accuracy. The oil-free design prevents gas from contaminating the grease. It operates silently and is suitable for industrial environments. The horizontal arrangement saves installation space and facilitates heat dissipation. It is directly fixed to the air distribution seat to reduce gas transmission loss.

[0035] The air pump compresses air to a set pressure through piston movement. The clean delivery principle is based on oil-free lubrication technology, ensuring that the output gas is free of oil contaminants. The efficient pressure replenishment principle is based on the matching of gas pressure and pipeline resistance, quickly pushing out residual grease. The space optimization principle is based on horizontal layout, making reasonable use of the space around the equipment. When the level gauge 5 detects that the residual grease in the lubrication nozzle 4 exceeds the threshold, the PLC starts the micro air pump 6. The air pump outputs high-pressure gas, which is distributed to the corresponding lubrication pipeline 3 through the air distributor 71. The gas pushes the residual grease into the bearing. After the pressure replenishment is completed, the air pump stops, and the pipeline is depressurized through the pressure relief valve. The air pump inlet filter element should be cleaned regularly (to prevent dust blockage), and the stability of the air pump output pressure and flow rate should be tested regularly.

[0036] Preferably, in any of the above embodiments, the opening and closing sealing plate 8 includes an electric sealing rod 81 connected to the PLC controller signal and a sealing plate 82 for sealing the air distribution seat 71. The electric sealing rod 81 is fixedly installed inside the air distribution seat 71, and the output end of the electric sealing rod 81 is fixedly installed with the sealing plate 82 that moves inside the air distribution seat 71.

[0037] The above technical solution is adopted: the electric sealing rod 81 (miniature electric push rod) of the opening and closing sealing plate 8 is fixed inside the gas distribution seat 71, and the sealing plate 82 (fluororubber material) is fixed at the output end of the sealing rod, which can fit the internal flow channel of the gas distribution seat. The PLC controls the electric sealing rod 81 to drive the sealing plate 82 to open and close precisely, realizing the gas on / off control of the corresponding gas distribution pipe. Gas is supplied only to the pipeline that needs pressure replenishment, saving energy. The fluororubber sealing plate is resistant to high pressure and has good sealing performance, preventing gas leakage. Precise positioning ensures that the sealing plate fits completely with the flow channel, avoiding gas cross-contamination. The overall structure realizes selective control of gas distribution and adapts to the differentiated pressure replenishment needs of multiple pipelines and multiple bearings lubricated at the same time.

[0038] The sealing rod achieves precise displacement of the sealing plate through linear drive. The sealing and blocking principle is based on the elastic fit between the sealing plate and the flow channel, blocking gas flow. The selective control principle is based on the independent signal output of the PLC to realize the individual on / off of each gas pipe. The weather resistance and adaptability principle is based on the temperature and corrosion resistance of fluororubber to adapt to the working environment of the lubrication system. After lubrication, the level gauge 5 reports that the residual amount exceeds the threshold. The PLC identifies the corresponding pipeline, the electric sealing rod 81 retracts, driving the sealing plate 82 to open the gas passage of the pipeline. The micro air pump 6 starts to replenish pressure. After the pressure replenishment is completed, the sealing rod extends, and the sealing plate closes the channel. The sealing plate is cleaned regularly (to prevent grease adhesion), and the positioning accuracy of the sealing rod and the sealing performance of the sealing plate are tested regularly.

[0039] Preferably, the filling sealing cap 9 includes an electric drive rod 91 connected to a PLC controller signal and a baffle plate 92 that seals the lubrication filling nozzle 4. The electric drive rod 91 is fixedly installed inside the lubrication filling seat 4, and the output end of the electric drive rod 91 is fixedly installed with the baffle plate 92 that moves inside the lubrication filling seat 4.

[0040] The above technical solution is adopted as follows: the electric drive rod 91 (miniature electric push rod) of the sealing cap 9 is fixed inside the lubrication nozzle 4, and the baffle plate 92 (fluororubber material) is fixed at the output end of the drive rod and can be embedded in the closed storage groove. Before lubrication, the PLC controls the electric drive rod 91 to retract, and the baffle plate 92 is stored in the closed storage groove, which does not affect the output of grease. After lubrication, the drive rod extends, and the baffle plate 92 blocks the outlet of the lubrication nozzle 4, forming a closed cavity. This allows the miniature air pump 6 to generate sufficient pressure to push the residual grease when replenishing pressure. The fluororubber baffle plate has good elasticity, adapts to the outlet profile of the nozzle, and has reliable sealing. The electric drive realizes automatic control, eliminating the need for manual operation and improving the convenience of maintenance.

[0041] The drive rod enables precise extension and retraction of the baffle plate. The sealing principle is based on the elastic deformation of the baffle plate to fill the outlet gap. The space storage principle is based on the structural design of the closed storage groove to ensure that the baffle plate and the outlet channel do not interfere with each other. The pressure building principle is based on the sealed cavity after sealing to ensure that the gas pressure effectively acts on the residual grease during pressure replenishment. When the lubrication program is started, the electric drive rod 91 retracts, and the baffle plate 92 is put into the closed storage groove. After the grease is injected into the bearing, the drive rod extends, and the baffle plate 92 seals the filling nozzle outlet. If pressure replenishment is required, the micro air pump 6 is started to form high pressure in the closed cavity to push the residual grease. After pressure replenishment is completed, the baffle plate resets and opens. The baffle plate should be cleaned regularly (to prevent grease adhesion), and the positioning accuracy of the drive rod and the sealing performance of the baffle plate should be tested regularly.

[0042] The working principle of this utility model for an automatic lubrication and maintenance device for chilled water pump bearings is as follows: The grease stored in grease tank 1, after being filtered for impurities by the outlet stainless steel filter screen, enters the metering dispenser 2. The PLC controller drives the dispenser's built-in pneumatic piston to precisely dispense a metered amount of grease. The grease then enters the lubrication pipeline 3 through a one-way valve and finally flows into the chilled water pump bearing through the lubrication filling nozzle 4. Before lubrication, the PLC controls the electric drive rod 91 of the filling sealing cap 9 to retract, and the baffle plate 92 retracts into the bottom of the filling nozzle to seal the storage groove, preventing obstruction of the lubrication channel. During lubrication, the one-way valve inside the filling nozzle prevents the bearing grease from flowing back. The level gauge 5 (capacitive type) monitors the grease level in the filling nozzle in real time and sends feedback to the PLC. After completion, if the level gauge detects that the residual amount exceeds the threshold, the PLC starts the micro air pump 6 and simultaneously controls the electric sealing rod 81 corresponding to the opening and closing sealing plate 8 in the air guide sealing seat 7 to retract. The sealing plate 82 opens the gas passage of the air distribution seat 71, and the high-pressure gas enters the target lubrication pipeline 3 through the air distribution pipe and the sealing pipe joint 72, pushing the residual grease to the filling nozzle. During this period, the baffle plate of the filling sealing cap 9 remains in a blocked state, forming a closed cavity in the filling nozzle to ensure that the gas pressure effectively acts on the residual grease. After the pressure is replenished, the air pump stops, the sealing plate resets to close the gas passage, and the baffle plate opens, completing one lubrication maintenance.

[0043] Compared with the prior art, the present invention has the following advantages: 1. A level gauge 5 is installed inside the lubrication nozzle 4 at the end of the lubrication and maintenance device to detect the effective delivery amount of lubricating grease. The detected data is compared with the preset lubricating grease data. Based on the comparison results, when the lubricating grease inside the lubrication nozzle 4 is insufficient, a micro air pump 6 is controlled to pump high-pressure gas into the corresponding lubrication pipeline 3 through the air guide sealing seat 7 and the opening and closing sealing plate 8. The high-pressure gas creates a high-pressure environment inside the corresponding lubrication pipeline 3 to clean the lubricating grease that is residual or stuck inside the lubrication pipeline 3. This ensures that the lubricating grease is effectively delivered while avoiding sticking, thus ensuring the stability of lubrication.

[0044] 2. A sealing cap 9 is provided at the bottom of the lubrication filling nozzle 4 to seal the lubrication filling nozzle 4. This can effectively form a sealed cavity inside the lubrication filling nozzle 4 for storing and testing the grease. It also facilitates the use of high-pressure gas generated by the micro air pump 6 to clean and drive the grease, thereby improving the stability of grease cleaning.

Claims

1. An automatic lubrication and maintenance device for a chilled water pump bearing, comprising a grease storage tank (1) for storing grease, wherein a metering dispenser (2) for distributing grease is fixedly installed at one end of the grease storage tank (1) via a sealing joint, and a lubrication pipeline (3) for conveying grease is fixedly installed around the circumference of the metering dispenser (2) via a one-way valve, characterized in that: One end of the lubrication pipeline (3) is fixedly installed with a lubrication filling nozzle (4) for discharging lubricating grease. The lubrication filling nozzle (4) is selected according to the bearing of the chilled water pump so that it is compatible with the lubricating grease filling port of the chilled water pump bearing end cover. The lubrication filling nozzle (4) is fixedly installed with a level gauge (5) for detecting the lubricating grease. The level gauge (5) is connected to a PLC controller. The PLC controller is connected to a miniature air pump (6) for pressurizing the lubricating grease delivery pressure. The output end of the miniature air pump (6) is fixedly installed with a gas guide sealing seat (7) for distributing pressurized gas. The gas guide sealing seat (7) is fixedly installed with an opening and closing sealing plate (8) for sealing it. The bottom of the lubrication filling nozzle (4) is fixedly installed with a filling sealing cap (9) that can be opened and closed.

2. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 1, characterized in that: The outlet of the grease tank (1) is equipped with a stainless steel filter screen to filter impurities in the grease, and the inside of the metering dispenser (2) is equipped with a pneumatic piston driven by a PLC controller.

3. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 2, characterized in that: The lubrication nozzle (4) is equipped with a one-way valve to prevent the grease in the bearing from flowing back. The lubrication nozzle (4) is provided with a mounting groove for a fixed liquid level gauge (5). The bottom of the lubrication nozzle (4) is provided with a closed storage groove located below the one-way valve.

4. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 3, characterized in that: The gas guide sealing seat (7) includes a gas distributor seat (71) for connection and fixation and a sealing pipe joint (72) for connecting and guiding gas. The gas distributor seat (71) is fixedly installed at one end of the metering distributor (2). Gas distribution pipes for conveying gas are provided at both ends of the gas distributor seat (71). A sealing pipe joint (72) that is fixedly installed with the lubrication pipeline (3) is fixedly installed at one end of the gas distribution pipe. One end of the sealing pipe joint (72) is fixedly installed with the metering distributor (2).

5. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 4, characterized in that: The micro air pump (6) is fixedly installed at one end of the air distribution seat (71), and the micro air pump (6) is located on one side of the metering dispenser (2).

6. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 5, characterized in that: The opening and closing sealing plate (8) includes an electric sealing rod (81) connected to the PLC controller signal and a sealing plate (82) for sealing the gas distribution seat (71). The electric sealing rod (81) is fixedly installed inside the gas distribution seat (71), and the output end of the electric sealing rod (81) is fixedly installed with a sealing plate (82) that moves inside the gas distribution seat (71).

7. The automatic lubrication and maintenance device for chilled water pump bearings as described in claim 6, characterized in that: The filling sealing cap (9) includes an electric drive rod (91) connected to the PLC controller signal and a baffle plate (92) that seals the lubrication filling nozzle (4). The electric drive rod (91) is fixedly installed inside the lubrication filling nozzle (4), and the output end of the electric drive rod (91) is fixedly installed with a baffle plate (92) that moves inside the lubrication filling nozzle (4).

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