CN215002391U - Rolling bearing system lubricated by refrigerant liquid - Google Patents
Rolling bearing system lubricated by refrigerant liquid Download PDFInfo
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- CN215002391U CN215002391U CN202120601521.8U CN202120601521U CN215002391U CN 215002391 U CN215002391 U CN 215002391U CN 202120601521 U CN202120601521 U CN 202120601521U CN 215002391 U CN215002391 U CN 215002391U
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Abstract
The utility model discloses a refrigerant liquid lubrication's antifriction bearing system, including motor, bearing assembly, compressor, condenser, evaporimeter and isolation liquid jar, adopted two kinds of refrigerants to supply the mode of lubricated bearing, can carry out corresponding lubrication according to the operation stage of the difference of compressor, guaranteed the effective lubrication of bearing.
Description
Technical Field
The utility model relates to a bearing lubrication technology field, concretely relates to refrigerant liquid lubrication's antifriction bearing system.
Background
The existing technology is a semi-closed centrifugal compressor adopting a rolling bearing, a sliding bearing or a magnetic suspension bearing, the technical development trend requires oil-free lubrication, maintenance of a lubrication oil circuit system, oil circuit management, oil return management and maintenance of the oil circuit system are eliminated, the oil-free lubrication also represents higher operation efficiency of the compressor and the refrigeration system, lower vibration, noise and operation stability are achieved, and customer experience is better.
The centrifugal compressor adopting the refrigerant liquid to lubricate the rolling bearing can provide bearing liquid supply with required pressure by high-pressure refrigerant liquid of a refrigerating system when the refrigerating system operates; in the starting and stopping processes, special design is needed to ensure stable bearing liquid supply and ensure that mechanical dry grinding abrasion of the rolling bearing cannot occur; in particular, in case of sudden power failure, the pressure difference of the liquid supply of the refrigerant liquid lubrication bearing is insufficient due to the sudden cut-off of the liquid supply power of the bearing, so that dry abrasion loss of parts such as the rolling bearing is caused, and a special design is required to ensure safe landing in case of sudden power failure of the rolling bearing compressor.
SUMMERY OF THE UTILITY MODEL
The technical insufficiency to the existence, the utility model aims at providing a refrigerant liquid lubrication's antifriction bearing system has adopted two kinds of refrigerants to supply liquid lubricated bearing's mode simultaneously, can carry out corresponding lubrication according to the operation stage of the difference of compressor, has guaranteed the effective lubrication of bearing.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides a rolling bearing system lubricated by refrigerant liquid, which comprises a motor, a bearing assembly, a compressor, a condenser, an evaporator and an isolation liquid tank;
the compressor is provided with an exhaust pipeline and communicated to the condenser;
an air suction pipeline is arranged on the compressor and is divided into two paths, wherein one path of the air suction pipeline is communicated with the motor to form a loop from motor cooling return air to the air suction pipeline, and the other path of the air suction pipeline is communicated to the evaporator;
a liquid phase pipeline is arranged on the condenser and divided into two paths, wherein one path is communicated with the motor to form a motor cooling liquid supply pipeline, and the other path is communicated to the evaporator to form a main evaporator liquid supply pipeline;
the motor is provided with a motor cooling return liquid to evaporator pipeline communicated with the evaporator;
the bearing assembly is provided with a bearing liquid supply pipeline communicated with the isolation liquid tank; a branch communicated with the liquid phase pipeline is arranged on the bearing liquid supply pipeline to form a condenser outlet pressure difference liquid supply pipeline;
the evaporator is communicated with the isolation liquid tank through a pipeline from the evaporator to the isolation liquid tank;
the isolation liquid tank is provided with an isolation liquid tank balance pressure pipeline which is communicated to the evaporator.
Preferably, a refrigerant liquid pump forced liquid supply pipeline is arranged on the isolation liquid tank, and the bearing liquid supply pipeline and the condenser outlet pressure difference liquid supply pipeline are communicated with the refrigerant liquid pump forced liquid supply pipeline.
Preferably, the refrigerant liquid pump I is arranged on the refrigerant liquid pump forced liquid supply pipeline and is connected with a check valve in series, and the conduction direction of the check valve is the direction from the isolation liquid tank to the bearing liquid supply pipeline.
Preferably, a one-way valve is arranged on the condenser outlet pressure difference liquid supply pipeline, and the conduction direction of the one-way valve is from the condenser to the bearing liquid supply pipeline.
Preferably, a second refrigerant liquid pump is arranged on the pipeline from the evaporator to the isolation liquid tank, and is connected in parallel with a one-way valve, and the conduction direction of the one-way valve is from the evaporator to the isolation liquid tank pipeline to the isolation liquid tank.
Preferably, a check valve is arranged on the exhaust pipeline, and the conduction direction of the check valve is from the compressor to the condenser.
Preferably, the bearing liquid supply pipeline is communicated with each bearing in the bearing assemblies through a plurality of branches respectively.
A method for lubricating a rolling bearing lubricated with a refrigerant liquid, according to the operating phase of a compressor:
the method comprises the following steps that pre-lubrication is carried out before a compressor is started, and a bearing assembly is lubricated from a forced liquid supply pipeline to a bearing liquid supply pipeline through a refrigerant liquid pump;
in the compressor operating phase, continuous lubrication is carried out:
if the differential pressure of the refrigeration system is less than the set value of the minimum differential pressure of the liquid supply of the bearing-downward offset, the bearing assembly forces the liquid supply pipeline to the liquid supply pipeline of the bearing through the refrigerant liquid pump for lubrication;
if the pressure difference of the refrigeration system is greater than the minimum pressure difference set value of the liquid supply of the bearing and the ascending offset, the bearing assembly is lubricated from a pressure difference liquid supply pipeline at the outlet of the condenser to a liquid supply pipeline of the bearing;
in the shutdown stage of the compressor, delayed lubrication is carried out, and the bearing assembly is lubricated from the liquid supply pipeline to the bearing liquid supply pipeline through the refrigerant liquid pump;
in the delayed lubrication stage of sudden power failure and shutdown of the compressor, the bearing assembly is lubricated from a condenser outlet differential pressure liquid supply pipeline to a bearing liquid supply pipeline;
the bearing liquid supply pressure difference is defined as bearing liquid supply pressure-liquid return pressure, the minimum bearing liquid supply pressure difference set value is a settable value, and the bearing liquid supply pressure difference is required to be controlled to be more than or equal to the minimum bearing liquid supply pressure difference set value; defining the differential pressure of the refrigeration system as condensation pressure-evaporation pressure; the uplink bias and the downlink bias are settable values.
The beneficial effects of the utility model reside in that:
the utility model adopts two ways of supplying liquid to lubricate the bearing by the refrigerant, which can lubricate the bearing according to different operation stages of the compressor, and ensures the effective lubrication of the bearing; the arrangement of the isolation liquid tank does not need to consider whether a refrigerant exists in the evaporator or the condenser, and the isolation liquid tank is used for storing full liquid refrigerant liquid, so that stable high-pressure liquid supply flow of the bearing can be ensured no matter before the compressor is started or during the operation of the compressor;
in addition, the isolation liquid tank is arranged in the compressor stopping process and is kept under the same pressure with the condenser and the evaporator, once the compressor stops, the refrigerant liquid in the evaporator can be quickly guided into the isolation liquid tank through the action of gravity and the electromagnetic valve, and the influence of refrigerant migration is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rolling bearing system lubricated by refrigerant liquid according to an embodiment of the present invention.
Description of reference numerals:
1-motor, 2-bearing assembly, 3-compressor, 4-susceptance cooling device, 5-evaporator, 6-isolation liquid tank, 7-refrigerant liquid pump I, 8-refrigerant liquid pump II, 9-main liquid supply electronic, 10-pressure regulating valve, 11-motor cooling liquid supply electronic expansion valve, 12-condenser liquid discharge electromagnetic valve, 13-isolation liquid tank pressure balance electromagnetic valve, 14-differential pressure liquid supply pipeline electromagnetic valve, 15-one-way valve, 16-suction stop valve, 17-filter;
101-an exhaust pipeline, 102-an air suction pipeline, 103-a liquid phase pipeline, 104-an evaporator main liquid supply pipeline, 105-a condenser outlet pressure difference liquid supply pipeline, 106-an evaporator to isolation liquid tank pipeline, 107-an isolation liquid tank balance pressure pipeline, 108-a refrigerant liquid pump forced liquid supply pipeline, 109-a bearing liquid supply pipeline, 110 motor cooling return air to an air suction pipeline loop, 111 motor cooling return liquid to an evaporator pipeline, and 112 motor cooling liquid supply pipeline;
p200-exhaust pressure sensor, P201-condensation pressure sensor, P202-evaporation pressure sensor, P203-bearing liquid supply pressure sensor, P204-liquid return pressure sensor, T200-exhaust temperature sensor, T201-liquid phase temperature sensor, T202-gas supply temperature sensor, L201-condenser liquid level sensor, L202-isolation liquid tank liquid level sensor/switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Examples
As shown in fig. 1, the present invention provides a rolling bearing system lubricated by refrigerant liquid, comprising a motor 1, a bearing assembly 2, a compressor 3, a condenser 4, an evaporator 5 and an isolating liquid tank 6, wherein the bearing assembly comprises a plurality of bearings, for example, it comprises two bearings as shown in fig. 1; in addition, corresponding valves and other components are also arranged on corresponding pipelines, and the other components include filters, various sensors and the like, wherein the valves and other components are all commercially available products, and are only illustrated by names, and specific structures of the valves and other components are not detailed, and the corresponding products can be selected according to names in the field, such as pressure sensors, which represent sensors capable of measuring pressure, and are specifically described in conjunction with fig. 1 and the description of the attached drawings.
Wherein, the compressor 3 is provided with an exhaust pipeline 101 and communicated to the condenser 4, the exhaust pipeline 101 is provided with a one-way valve 15, and the communication direction of the one-way valve 15 is from the compressor 3 to the condenser 4;
the compressor 3 is provided with an air suction pipeline 102, the air suction pipeline 102 is divided into two paths, one path is communicated with the motor 1 to form a motor cooling return air to an air suction pipeline loop 110, and the other path is communicated to the evaporator 5;
the condenser 4 is provided with a liquid phase pipeline 103, the liquid phase pipeline 103 is divided into two paths, one path is communicated with the motor 1 to form a motor cooling liquid supply pipeline 112, and the other path is communicated to the evaporator 5 to form an evaporator main liquid supply pipeline 104;
the motor 1 is provided with a motor cooling return liquid to evaporator pipeline 111 communicated with the evaporator 5;
the bearing assembly 2 is provided with a bearing liquid supply pipeline 109 communicated with the isolation liquid tank 6, and the bearing liquid supply pipeline 109 is respectively communicated with each bearing in the plurality of bearing assemblies 2 through a plurality of branches; a branch communicated with the liquid phase pipeline 103 is arranged on the bearing liquid supply pipeline 109 to form a condenser outlet pressure difference liquid supply pipeline 105, a one-way valve 15 is arranged on the condenser outlet pressure difference liquid supply pipeline 105, and the conduction direction of the one-way valve 15 is from the condenser 4 to the bearing liquid supply pipeline 109;
the evaporator 5 is communicated with the isolation liquid tank 6 through an evaporator-to-isolation liquid tank pipeline 106, a refrigerant liquid pump II 8 is arranged on the evaporator-to-isolation liquid tank pipeline 106, and is connected with a check valve 15 in parallel, and the conduction direction of the check valve 15 is from the evaporator-to-isolation liquid tank pipeline 106 to the isolation liquid tank 6;
the isolation liquid tank 6 is provided with an isolation liquid tank balance pressure pipeline 107, and the isolation liquid tank balance pressure pipeline 107 is communicated to the evaporator 5;
the isolating liquid tank 6 is provided with a refrigerant liquid pump forced liquid supply pipeline 108, and both the bearing liquid supply pipeline 109 and the condenser outlet pressure difference liquid supply pipeline 105 are communicated with the refrigerant liquid pump forced liquid supply pipeline 108; the refrigerant liquid pump forced liquid supply pipeline 108 is provided with a refrigerant liquid pump I7 and is connected with a check valve 15 in series, and the conduction direction of the check valve 15 is from the isolation liquid tank 6 to the bearing liquid supply pipeline 109;
setting of the isolation liquid tank 6:
(a) whether a refrigerant exists in the evaporator 4 or not or in the condenser 5 is not needed to be considered, only the condenser 4 is needed, when liquid in the evaporator 5 stops, before the compressor 3 starts, in the running process of the compressor 3, a part of refrigerant liquid in the evaporator is directly or indirectly discharged into the isolating liquid tank 6, and the isolating liquid tank 6 is ensured to store full liquid refrigerant liquid, so that the refrigerant liquid can be ensured to be fully filled in the suction pipeline of the refrigerant liquid pump I7 no matter before the compressor 3 starts or in the running process of the compressor 3, the continuous and reliable safe running of the liquid pump is ensured, and the high-pressure liquid supply flow of a stable bearing is ensured;
(b) when gas exists at the top of the isolation liquid tank 6, the resistance of the gas will influence the continuous filling of the liquid, so that the redundant gas needs to be emptied to the low-pressure side of the evaporator 5, and the pressure in the isolation liquid tank 6 is mainly ensured to be equal to the pressure of the evaporator 5; the top of the isolation liquid tank 6 is provided with a balance pipeline and an electromagnetic valve for balancing pressure and exhausting, which is the principle of forming a communicating vessel, and the basic physics knowledge tells us that when the tops of two containers are communicated together to form the same pressure field, the liquid levels of the two containers become flush, so that the balance pipeline and the electromagnetic valve conduct the top pipeline to form a pressure, the liquid levels of the evaporator 5 and the isolation liquid tank 6 are flush, the refrigerant liquid in the evaporator 5 and the refrigerant liquid in the isolation liquid tank 6 can be guided into the isolation liquid tank through the action of gravity, and the negative influence of the refrigerant migration on the refrigerant liquid pump I7 is avoided. Since this insulating liquid tank 6 is in communication with the evaporator 5, the pressure in the insulating liquid tank 6 and the pressure in the evaporator 5 are also the same, and the pressure in the evaporator 5 is a low pressure region in the refrigeration system, and therefore the pressure in the insulating liquid tank 6 is also a low pressure, and therefore belongs to the category of low pressure liquid storage tanks;
the purpose of isolating the liquid tank 6 is two: one is as follows: the main purpose of the isolating liquid tank 6 is that the isolating liquid tank is positioned at the upstream of the refrigerant liquid pump I7, the refrigerant liquid pump I7 is to ensure that liquid is sucked but not gas or gas-liquid two-phase mixture, if the refrigerant liquid pump I7 cannot ensure that pure liquid is sucked, the liquid pump has the risk of reliability damage, and the isolating liquid tank 6 is used for ensuring that a suction inlet of the refrigerant liquid pump I7 is pure liquid-phase refrigerant at any time, ensuring the stable long-term operation of the liquid pump, and further ensuring that liquid supply of a bearing is also pure liquid phase and stably and long-term operation. Through the effect of gravity, through the effect of the balanced solenoid valve that uses in top, can let evaporimeter 5 and isolation liquid tank 6 form a linker subassembly, so long as the liquid pump will keep apart the liquid in the liquid tank 6 and take away a bit, just can fill up isolation liquid tank 6 from evaporimeter 5 supplementary liquid through the principle that the linker liquid level is parallel and level, just that is isolation liquid tank 6 is full of liquid at any time. This is the mush of the solenoid valve which isolates the liquid tank 6 from the top equalising pressure. The second function of the isolating liquid tank 6 is: because the operation of the water circuits of the evaporator 5 and the condenser 4 (both called as heat exchangers) is not completely consistent with that of the refrigeration system, the compressor is stopped, the refrigeration system stops, but the operation of the water circuits of the evaporator 5 and the condenser 4 is possible to be always operated, so that water can absorb the heat of the pump and then the temperature is increased through the operation of the water pump, the water with the increased temperature can heat the refrigerant in the evaporator 5 or the condenser 4 to gasify the liquid refrigerant, the refrigerant forms migration, the refrigerant migration is uncertain, the refrigerant can migrate into the evaporator 5 and can migrate into the condenser 4, the suction of the refrigerant liquid pump one 7 cannot be guaranteed to be pure liquid phase due to the migration effect of the refrigerant, the damage of the refrigerant liquid pump can be caused, the bearing damage can be caused, and a small part of the refrigerant liquid in the evaporator 5 and the condenser 4 can be led into the isolating liquid tank 6, the refrigerant liquid of the part can not be transferred to other places due to the transfer action of the refrigerant, so that the isolation liquid tank 6 can be always full of liquid, and the reliable operation of the refrigerant liquid pump I7 and the reliable operation of the bearing can be ensured;
(c) for the design of multiple parallel machines, when one cold water unit stops, but the water path does not stop, the temperature of the refrigerant in the shell is lower than the water temperature, the water heats the refrigerant and flashes the refrigerant, so that the refrigerant liquid can not be led out from the container stably, and if the refrigerant liquid cannot be sucked and pressurized by the refrigerant liquid pump 7 before the compressor, the compressor 3 cannot be started and the system cannot run, at the moment, the concept of the isolating liquid tank 6 is provided, the isolating liquid tank and the heat exchanger are kept under the same pressure in the standby process, once the compressor 3 is stopped, the refrigerant liquid in the heat exchanger can be quickly led into the isolating liquid tank 6 through the action of gravity and an electromagnetic valve, and the influence of refrigerant migration is avoided; in the running process of the compressor 3, according to the liquid level detected by the liquid level sensor, refrigerant liquid is introduced into the evaporator 5 as necessary, the pressure of the refrigerant liquid in the evaporator 5 is ensured to be the same as that of the evaporator 5 by a balance pipeline at the top, and the refrigerant liquid in the evaporator 5 is pumped into the isolating liquid tank 6 by the refrigerant liquid pump II 8 as necessary under the action of gravity, so that the isolating liquid tank 6 is ensured to be full of liquid at any time; the key point of ensuring the stable operation of the refrigerant liquid pump I7 and the reliable operation of the rolling bearing is that the isolation liquid tank 6 is a liquid device isolated from a refrigeration system and is a very important design.
In the actual use process, the bearings need to be lubricated according to the operation stage of the compressor 3, and the specific lubricating method is as follows:
during the operating phase of the compressor 3, continuous lubrication is carried out:
if the pressure difference of the refrigeration system is less than the set value of the minimum pressure difference of the liquid supply of the bearing-downward offset, the bearing assembly 2 is lubricated from the liquid supply pipeline 108 to the liquid supply pipeline 109 through the refrigerant liquid pump, namely the liquid pump is adopted to supply liquid forcibly;
if the pressure difference of the refrigeration system is greater than the set value of the minimum pressure difference of the liquid supply of the bearing and the upward offset, the bearing assembly 2 is lubricated from a pressure difference liquid supply pipeline 105 at the outlet of the condenser to a bearing liquid supply pipeline 109, namely, the pressure difference liquid supply is adopted;
in the shutdown stage of the compressor, delayed lubrication is performed, and the bearing assembly 2 is lubricated from the refrigerant liquid pump forced liquid supply pipeline 108 to the bearing liquid supply pipeline 109;
in the delayed lubrication stage of sudden power-off shutdown of the compressor, the bearing assembly 2 is lubricated from the condenser outlet differential pressure liquid supply pipeline 105 to the bearing liquid supply pipeline 109;
the bearing liquid supply pressure difference is defined as bearing liquid supply pressure-liquid return pressure, the bearing liquid supply pressure is obtained through a bearing liquid supply pressure sensor P203 on a bearing liquid supply pipeline 109, the liquid return pressure is obtained through a liquid return pressure sensor P204 on an evaporator pipeline 11 cooled by a motor and returned to liquid, the minimum bearing liquid supply pressure difference set value is a settable value, and the bearing liquid supply pressure difference is required to be controlled to be more than or equal to the minimum bearing liquid supply pressure difference set value; defining the differential pressure of the refrigeration system as condensation pressure-evaporation pressure; the uplink bias and the downlink bias are set as settable values; the pressure at this point is obtained by providing a corresponding pressure sensor, as shown in fig. 1 in particular;
for example: before the compressor 3 is started, the liquid pump is adopted to forcibly supply liquid until the compressor 3 is started and gradually loaded, the differential pressure of the refrigerating system is gradually increased from 0MPa until the differential pressure of the refrigerating system is greater than the minimum differential pressure set value of the liquid supply of the bearing + the ascending offset, and the pressure is maintained for 30s, then the forced liquid supply pressurized by the refrigerant liquid pump can be closed, and only the differential pressure liquid supply of the high-pressure liquid at the outlet of the condenser is adopted; when the pressure difference of the refrigeration system is less than the set value of the minimum pressure difference of the liquid supply of the bearing-descending offset and lasts for 30s, the forced liquid supply pressurized by the refrigerant liquid pump is started; the uplink bias and the downlink bias are both used for ensuring that the influence of opening and closing the forced liquid supply on the system is smooth, large system fluctuation cannot be generated, and frequent opening and closing of a pump cannot be caused, for example, the uplink bias is set to be 0.5MPa, and the downlink bias is set to be 0.3 MPa;
meanwhile, in a bearing liquid supply pipeline, the pressure difference adjustment of the refrigerant liquid pump I7 after the valve is carried out through a pressure adjusting valve 10, and the pressure adjusting valve has the function of adjusting the outlet pressure of the liquid pump and the bearing liquid supply pressure difference to be not less than the minimum pressure difference set value of the bearing liquid supply; in addition, when the liquid pump forcibly supplies liquid to be opened and closed, the liquid supply pressure difference of the bearing can be fluctuated, for example, when the compressor runs, the pressure difference liquid supply of high-pressure liquid at the outlet of the condenser is adopted, and when the pressure difference of the refrigeration system is less than the set value of the minimum pressure difference of the liquid supply of the bearing-the downward offset, the compressor is opened: the refrigerant liquid pump is used for pressurizing forced liquid supply, the pressure regulating valve 10 is regulated, the bearing liquid supply pressure is guaranteed to be equal to the condensation pressure +/-0.15 MPa and is not lower than the minimum liquid supply pressure difference, and the impact on a refrigerating system and the large fluctuation of the bearing liquid supply pressure difference caused by the opening and closing of the liquid pump forced liquid supply are avoided;
for bearing lubrication of the system, the flow of the refrigerating liquid is specifically as follows:
(a) liquid drainage of a condenser: from the liquid phase pipeline 103 of the condenser, the main liquid supply electronic expansion valve 9 is opened, namely a part of the refrigerating liquid in the condenser 4 is led into the evaporator 5;
(b) liquid drainage of the evaporator 5: a pipe 106 from the evaporator to the insulating liquid tank passes through the second refrigerant liquid pump 8 and the check valve 15, and a part of the refrigerant in the evaporator 5 is introduced into the insulating liquid tank 6;
(c) pressure equalization of the isolated liquid tank 6: in the process of introducing the liquid from the evaporator 5, the pressure balance electromagnetic valve 13 of the isolation liquid tank needs to be opened, so that the balance pressure pipeline 107 of the isolation liquid tank is conducted, redundant gas in the isolation liquid tank 6 is discharged into the evaporator 5, and the isolation liquid tank 6 can be ensured to be filled; the pressure of the isolation liquid tank 6 and the pressure of the evaporator 5 can be balanced in the running process of the compressor 3, and the pressure of the isolation liquid tank 6 is ensured to be the same as the pressure of the evaporator 5;
(d) forced liquid supply by a liquid pump: by the suction action of the refrigerant liquid pump I7, the refrigerant liquid in the isolation liquid tank 6 flows through the refrigerant liquid pump forced liquid supply pipeline 108 and the one-way valve 15 to enter the bearing liquid supply pipeline 109, and finally high-pressure refrigerant liquid is supplied to the rolling bearing to lubricate and cool the bearing; the first refrigerant liquid pump 7 can increase the pressure of the refrigerant liquid to be about 0.15MPa to 0.50MPa higher than the pressure of the isolation liquid tank 6;
(e) pressure difference liquid supply: the electromagnetic valve 14 of the pressure difference liquid supply pipeline of the condenser 4 is opened, the high-pressure refrigerant liquid in the high-pressure liquid phase pipeline 103 of the condenser 4 enters the bearing liquid supply pipeline 109 through the pressure difference liquid supply pipeline 105 at the outlet of the condenser and the check valve 15 on the pressure difference liquid supply pipeline, and the high-pressure refrigerant liquid is supplied to the rolling bearing to provide lubrication and cooling for the bearing;
(f) stopping the compressor: the compressor is started for 30s before stopping, a liquid pump is adopted to forcibly supply liquid, the pressure regulating valve 10 is regulated, and the pressure of the outlet of the pump is regulated to be the condensing pressure plus or minus 0.15MPa and is not lower than the liquid supply pressure difference; stopping the compressor, and keeping the liquid pump to forcibly supply liquid for continuous operation for 60 s;
(g) and (3) sudden power failure and shutdown: the condenser is a huge container of high-pressure gas and high-pressure liquid, the high-pressure refrigerant liquid at the bottom of the container can supply the high-pressure refrigerant liquid for about 15-20s to the rolling bearing through a pressure difference liquid supply pipeline 105 at the outlet of the condenser and a one-way valve 15, and the delayed high-pressure liquid supply of the rolling bearing can be realized through the high-pressure liquid at the bottom of the condenser when the power is cut off suddenly; the design of the permanent magnet motor is effective, because the liquid in the container can quickly carry out high-low pressure balance through a pipeline which can be communicated, because the flow openings of the main liquid supply expansion valve 9 and the motor cooling liquid supply electronic expansion valve 11 are small, the one-way valve 15 prevents gas from reversely flowing back to the air suction port of the compressor 3, the condenser liquid discharge electromagnetic valve 12 and the isolation liquid tank pressure balance electromagnetic valve 13 are closed, most of the liquid is balanced to the low-pressure side through the condenser outlet pressure difference liquid supply pipeline 105, but the time can only last for 15-20s, the high-low pressure is balanced, the rotor of the permanent magnet motor is a permanent magnet, the power is suddenly cut off, the stator magnetic field disappears, the rotor magnetic field is equivalent to the reverse excitation braking action, the complete stop in 5-10s can be generally ensured, and the time of gas supply 15-20s can be longer than the time of 5-10s for rotating to complete stop, however, this also requires system design to ensure, but also illustrates that in the case of only permanent magnet motors, sudden power failure of the motor can be ensured, reliability can be ensured, but asynchronous induction motors cannot be used.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The rolling bearing system lubricated by refrigerant liquid is characterized by comprising a motor (1), a bearing assembly (2), a compressor (3), a condenser (4), an evaporator (5) and an isolating liquid tank (6);
wherein, the compressor (3) is provided with an exhaust pipeline (101) and communicated to the condenser (4);
an air suction pipeline (102) is arranged on the compressor (3), the air suction pipeline (102) is divided into two paths, one path of the air suction pipeline is communicated with the motor (1) to form a motor cooling return air to air suction pipeline loop (110), and the other path of the air suction pipeline loop is communicated with the evaporator (5);
a liquid phase pipeline (103) is arranged on the condenser (4), the liquid phase pipeline (103) is divided into two paths, one path of the liquid phase pipeline is communicated with the motor (1) to form a motor cooling liquid supply pipeline (112), and the other path of the liquid phase pipeline is communicated with the evaporator (5) to form an evaporator main liquid supply pipeline (104);
a motor cooling return liquid to evaporator pipeline (111) communicated with the evaporator (5) is arranged on the motor (1);
a bearing liquid supply pipeline (109) communicated with the isolation liquid tank (6) is arranged on the bearing assembly (2); a branch communicated with the liquid phase pipeline (103) is arranged on the bearing liquid supply pipeline (109) to form a condenser outlet pressure difference liquid supply pipeline (105);
the evaporator (5) is communicated with the isolation liquid tank (6) through an evaporator-to-isolation liquid tank pipeline (106);
an isolation liquid tank balance pressure pipeline (107) is arranged on the isolation liquid tank (6), and the isolation liquid tank balance pressure pipeline (107) is communicated to the evaporator (5).
2. A refrigerant liquid lubricated rolling bearing system according to claim 1, wherein said barrier liquid tank (6) is provided with a refrigerant liquid pump forced feed line (108), and said bearing feed line (109) and said condenser outlet differential pressure feed line (105) are both in communication with said refrigerant liquid pump forced feed line (108).
3. A refrigerant liquid lubricated rolling bearing system according to claim 2, wherein said refrigerant liquid pump forced feed line (108) is provided with a refrigerant liquid pump one (7) and is connected in series with a check valve (15), the check valve (15) being conducted in a direction to isolate the liquid tank (6) from the bearing feed line (109).
4. A refrigerant liquid lubricated rolling bearing system according to claim 2, wherein said condenser outlet differential pressure feed line (105) is provided with a check valve (15), said check valve (15) being in communication from said condenser (4) to said bearing feed line (109).
5. A refrigerant liquid lubricated rolling bearing system according to claim 1 wherein a second refrigerant liquid pump (8) is provided in said evaporator to barrier liquid tank line (106) and connected in parallel with a check valve (15), said check valve (15) being in communication with said evaporator to barrier liquid tank line (106) to barrier liquid tank (6).
6. Rolling bearing system for liquid lubrication with refrigerant according to claim 1, wherein said discharge line (101) is provided with a check valve (15), the check valve (15) being conducted in the direction from the compressor (3) to the condenser (4).
7. A refrigerant liquid lubricated rolling bearing system according to claim 1 wherein said bearing feed line (109) communicates with each of a plurality of bearings in a plurality of bearing assemblies (2) through a plurality of branch lines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120601521.8U CN215002391U (en) | 2021-03-24 | 2021-03-24 | Rolling bearing system lubricated by refrigerant liquid |
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| CN202120601521.8U CN215002391U (en) | 2021-03-24 | 2021-03-24 | Rolling bearing system lubricated by refrigerant liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115751661A (en) * | 2022-11-02 | 2023-03-07 | 青岛海信日立空调系统有限公司 | Oilless bearing liquid supply air conditioning system and control method thereof |
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2021
- 2021-03-24 CN CN202120601521.8U patent/CN215002391U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115751661A (en) * | 2022-11-02 | 2023-03-07 | 青岛海信日立空调系统有限公司 | Oilless bearing liquid supply air conditioning system and control method thereof |
| CN115751661B (en) * | 2022-11-02 | 2024-03-08 | 青岛海信日立空调系统有限公司 | Oilless bearing liquid supply air conditioning system and control method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221207 Address after: 266555, No. 218, Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee after: QINGDAO HISENSE HITACHI AIR-CONDITIONING SYSTEMS Co.,Ltd. Address before: 214121 No. 1600 West high wave road, Jiangsu, Wuxi Patentee before: WUXI INSTITUTE OF TECHNOLOGY |
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| TR01 | Transfer of patent right |