CN218544616U - Oilless bearing liquid supply air conditioning system - Google Patents
Oilless bearing liquid supply air conditioning system Download PDFInfo
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- CN218544616U CN218544616U CN202222915789.6U CN202222915789U CN218544616U CN 218544616 U CN218544616 U CN 218544616U CN 202222915789 U CN202222915789 U CN 202222915789U CN 218544616 U CN218544616 U CN 218544616U
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Abstract
The utility model provides an oilless bearing supplies liquid air conditioning system realizes compressor bearing lubrication, motor cooling and compressor tonifying qi through setting up different refrigerant circulation routes among this air conditioning system, has simplified the structure of system, improves system work efficiency. The oilless bearing liquid supply air conditioning system comprises: a box system; a refrigeration system, the refrigeration system comprising: a compressor, a condenser, an evaporator, and an economizer; the compressor comprises a motor, a bearing and an impeller; a first liquid supply bag and a second liquid supply bag are arranged below the condenser; the first liquid supply bag is communicated with the compressor to form a first bearing lubricating liquid supply path; the second liquid supply sac is communicated with the compressor to form a motor cooling liquid supply path; the second liquid supply sac is communicated with the economizer to form a refrigerant liquid supply path; the economizer is communicated with the compressor to form an air replenishing path.
Description
Technical Field
The utility model relates to the technical field of electrical apparatus, especially, relate to an oilless bearing supplies liquid air conditioning system.
Background
With the development of scientific technology, the application of air conditioners is more and more common, and more people's daily life is closely related to the air conditioners.
At present, a compressor is mainly used in an air conditioner, a bearing is dominant in a centrifugal water chilling unit in an oil lubrication mode, but due to the existence of lubricating oil, an oil lubrication system and an oil separation system for supplying and returning oil need to be considered in the design of the water chilling unit, so that the complexity of design, manufacture, maintenance and control is increased, the huge initial cost and the operation and maintenance cost are increased, and the environmental pollution can be caused by the leakage of the lubricating oil; meanwhile, lubricating oil enters the evaporator and the condenser along with a refrigerant, so that the heat exchange effect and the system energy efficiency are influenced, and the performance of the unit is degraded after long-term operation.
Disclosure of Invention
For solving the problem of the above-mentioned prior art, the utility model provides an oilless bearing supplies liquid air conditioning system, this oilless bearing supplies liquid air conditioning system not only use refrigerant liquid to replace the bearing in the lubricated compressor of lubricating oil, still realizes the function of compressor motor cooling and compressor tonifying qi simultaneously, has simplified the structure of system, improves system work efficiency.
The oilless bearing liquid supply air conditioning system comprises: a tank system and a refrigeration system; refrigerating system is located the box system, and refrigerating system includes: a compressor, a condenser, an evaporator, a refrigeration liquid pump and an economizer;
in some embodiments, a first liquid supply bladder and a second liquid supply bladder are positioned below the condenser; the first liquid supply bag and the second liquid supply bag are respectively communicated with the condenser and used for storing refrigerant liquid in the condenser; the first liquid supply bag is communicated with the compressor to form a first bearing lubrication liquid supply path, and the first bearing lubrication liquid supply path is used for lubricating a bearing in the compressor; the second liquid supply bag is communicated with the compressor to form a motor cooling liquid supply path, and the motor cooling liquid supply path is used for cooling a motor in the compressor; a pipeline of the second liquid supply bag communicated with the economizer forms a refrigerant liquid supply path, and the refrigerant liquid supply path is used for supplying refrigerant liquid to the economizer; the economizer is communicated with the compressor to form an air supplementing path for supplementing air to the compressor.
The refrigeration system further includes a second bearing lubrication supply path from the evaporator to the compressor;
the second bearing lubrication supply path is for delivering refrigerant liquid to the compressor to lubricate a bearing in the compressor.
The first bearing lubrication liquid supply path comprises a front section path and a rear section path which are communicated; the second bearing lubricating liquid supply path comprises a front section path and a rear section path which are communicated; the rear section path of the first bearing lubrication liquid supply path and the rear section path of the second bearing lubrication liquid supply path are the same path;
in some embodiments, the forward path of the first bearing lubrication supply path includes a first check valve; the front section path of the second bearing lubricating liquid supply path comprises a first filter, a refrigerating liquid pump and a second one-way valve which are arranged in sequence; the rear section path of the first bearing lubrication liquid supply path comprises a pressure regulating valve and a second filter which are arranged in sequence.
In some embodiments, the number of cryogenic liquid pumps is at least two, at least two cryogenic liquid pumps being arranged in parallel.
In some embodiments, the refrigeration system further comprises a refrigerant liquid isolation tank in communication with the evaporator; the second bearing lubrication liquid supply path is communicated with the refrigerant liquid isolation tank.
In some embodiments, the refrigeration system further comprises: a first discharge path from the compressor to the condenser; a second exhaust path from the evaporator to the condenser; a make-up gas path from the economizer to the compressor; a liquid return path from the economizer to the evaporator; the bearings from the compressor to the evaporator lubricate the return fluid or return air path.
In some embodiments, the refrigeration system further comprises: a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor. The first pressure sensor is connected with the condenser and used for collecting the pressure value of the condenser; the second pressure sensor is connected with the evaporator and used for collecting the pressure value of the evaporator; the third pressure sensor is connected with the rear section path of the first condensing agent liquid supply path and is used for collecting the pressure value of the bearing liquid supply; and the fourth pressure sensor is connected with the bearing lubrication liquid return or air return path and is used for acquiring the pressure value of the bearing lubrication liquid return or air return.
In some embodiments, the refrigeration system further comprises: the first liquid level sensor is used for monitoring the liquid level of the condenser; the second liquid level sensor is used for monitoring the liquid level of the economizer; a third level sensor is used to monitor the level of the refrigerant liquid isolation tank.
In some embodiments, a second electrically-operated regulator valve is provided on the refrigerant supply path, the second electrically-operated regulator valve regulating the amount of refrigerant in the condenser based on the value of the first level sensor.
In some embodiments, the refrigeration system further comprises: a first temperature sensor for monitoring a temperature of the first exhaust path; and the second temperature sensor is used for monitoring the temperature of the rear section path of the first bearing lubrication liquid supply path.
Based on the technical scheme, the utility model discloses the oilless bearing supplies liquid air conditioning system that some embodiments provided has realized the structure to compressor bearing lubrication, motor cooling and compressor tonifying qi through setting up different routes, has simplified the system.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is a system block diagram of an oilless bearing liquid supply air conditioning system according to an embodiment of the present invention;
fig. 2 is a block diagram of a compressor system according to an embodiment of the present invention;
fig. 3 is a structural diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 4 is a partial block diagram of a liquid supply source according to an embodiment of the present invention;
FIG. 5 is a partial block diagram of another embodiment of a liquid supply source;
fig. 6 is a partial structure diagram of a refrigeration system according to an embodiment of the present invention;
fig. 7 is a partial path structure diagram of a refrigeration system according to an embodiment of the present invention;
fig. 8 is an overall structural diagram of a refrigeration system according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a stable start-up of a refrigeration system according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a power-off process of a refrigeration system according to an embodiment of the present invention.
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.
It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art. In addition, when describing the pipeline, the utility model discloses used "link to each other", "connect" then has the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
As described in the background art, the current bearings are mainly used in centrifugal chiller units by adopting an oil lubrication method, but due to the existence of lubricating oil, an oil lubrication system and an oil separation system for supplying and returning oil are considered in the design of the chiller units, so that the complexity of design, manufacture, maintenance and control is increased, the huge initial cost and operation and maintenance cost are increased, and the environmental pollution is caused by the leakage of the lubricating oil; meanwhile, lubricating oil enters the evaporator and the condenser along with a refrigerant, so that the heat exchange effect and the system energy efficiency are influenced, and the performance of the unit is degraded after long-term operation.
Based on this, the embodiment of the utility model provides an oilless bearing supplies liquid air conditioning system uses refrigerant liquid to replace the bearing of lubricating oil in to the compressor among this oilless bearing supplies liquid air conditioning system to according to refrigerating system running state's difference, take different refrigerant liquid to supply liquid source and route, the condenser high-pressure differential that exists when refrigerating system moves supplies liquid naturally and uses refrigeration liquid pump additionally to provide power and force and supply liquid dual mode. Through two different refrigerant liquid supply modes, the bearings can be ensured to be supplied with sufficient refrigerant liquid at each stage of the operation of the oil-free refrigeration system, and the lubricating state of the bearings can be effectively ensured so as to ensure the normal operation of the oil-free refrigeration system.
As shown in fig. 1, some embodiments of the present invention provide an oilless bearing liquid supply air conditioning system 1000 comprising: a tank system 200 and a refrigeration system 32, said refrigeration system 32 being located within the tank system 200, the refrigeration system 32 comprising: compressor 42, condenser 19, evaporator 29, refrigerant liquid pump 22, and economizer 25; the refrigeration system further includes: a first bearing lubrication liquid supply path 125 from the condenser 19 to the compressor 42 and a second bearing lubrication liquid supply path 126 from the evaporator 29 to the compressor 42 (shown in FIG. 3); and the second bearing lubrication liquid supply path of the compressor 42 further comprises a refrigeration liquid pump 22, and the refrigeration liquid pump 22 is arranged between the evaporator 29 and the compressor 42.
Wherein the pump is a machine for conveying or pressurizing fluid, which transfers mechanical energy of the prime mover or other external energy to the liquid, so that the energy of the liquid is increased. The above-described refrigerant fluid pumping action is to forcibly pump refrigerant fluid to supply to the compressor 42 via the second bearing lubrication supply path.
As shown in fig. 2, the compressor 42 includes: the device comprises a motor 4, a bearing 3, a primary impeller 1 and a secondary impeller 2; the bearing 3 is located on the motor 4. The first bearing lubrication liquid supply path and the second bearing lubrication liquid supply path are each for delivering refrigerant liquid to the compressor 42 to lubricate the bearings 3 of the motor 4 in the compressor 42.
Among them, a compressor (compressor) is a driven fluid machine that raises low-pressure gas into high-pressure gas, and is a heart of a refrigeration system. The compressor sucks low-temperature and low-pressure refrigerant gas from the air suction pipe, the motor operates to drive the impeller to rotate, so that the gas speed is increased, and the pressure of the gas is greatly increased after the gas is diffused by the diffuser, so that power is provided for the refrigeration cycle.
A condenser (condenser), which is a basic component of a refrigeration system, is a type of heat exchanger that converts a gas or vapor into a liquid and transfers the heat from the tubes to the air in the vicinity of the tubes in a rapid manner.
The evaporator (evaparator) is an important part in a refrigerating system, and low-temperature condensed liquid passes through the evaporator to exchange heat with outside air, is gasified to absorb heat, and achieves the refrigerating effect. The evaporator mainly comprises a heating chamber and an evaporation chamber. The heating chamber provides heat required by evaporation to the liquid to promote boiling and vaporization of the liquid; the evaporation chamber makes the gas phase and the liquid phase completely separated.
An economizer (economizer) is a heat exchanger that subcools another portion of refrigerant by absorbing heat through throttling evaporation of the refrigerant itself.
In some embodiments, the compressor is a two-stage centrifugal compressor.
In some embodiments, the motor is a permanent magnet motor, and the rotor of the permanent magnet motor can stop rotating in a short time after power failure and shutdown.
In some embodiments, the bearing is a ceramic bearing, which is corrosion resistant and suitable for use in a highly corrosive working environment; the influence of temperature difference change on the ceramic bearing is small, and large temperature difference change can be borne; the ceramic bearing has higher elastic modulus and is rarely deformed due to stress; the ceramic ball has lower density than steel and lighter weight, and can reduce friction generated by centrifugal force during rotation and prolong the service life of the bearing.
The above embodiments of the present disclosure provide a refrigeration system, which lubricates bearings of a motor in a compressor by refrigerant liquid, and provides two refrigerant liquid supply paths, namely, a first bearing lubrication liquid supply path 125 from a condenser 19 to the compressor 42 and a second bearing lubrication liquid supply path 126 from an evaporator 29 to the compressor 42, respectively, that is, refrigerant liquid generated by the condenser and refrigerant liquid generated by the evaporator are respectively transmitted to the compressor, and of the two liquid supply paths, the first bearing lubrication liquid supply path 125 is a path which does not need a refrigeration liquid pump, and the second bearing lubrication liquid supply path 126 needs the refrigeration liquid pump to provide power, so that different liquid supply paths can be selected at different stages according to the operation state of the refrigeration system during the whole operation process of the refrigeration system, and it is ensured that the bearings in the compressor can obtain sufficient refrigerant liquid for lubrication at each stage, thereby ensuring the safety of the system operation.
As shown in fig. 1 and 3, the first bearing lubrication liquid supply path includes a front section path 105 and a rear section path 111 which are communicated with each other; the second bearing lubrication liquid supply path comprises a front section path 103 and a rear section path 111 which are communicated with each other; the rear section path of the first bearing lubrication liquid supply path and the rear section path of the second bearing lubrication liquid supply path are the same path.
That is, as shown in fig. 1 and 3, the first bearing lubrication liquid supply path and the second bearing lubrication liquid supply path connect different sources of refrigerant liquid in the first half and join together in the second half, both of which deliver refrigerant liquid to the bearings in the compressor through the back stage path 111.
Wherein, the front section path 105 of the first bearing lubrication liquid supply path comprises a first check valve 11; the front section path 103 of the second bearing lubrication liquid supply path comprises a first filter 35, the refrigeration liquid pump 22 and a second one-way valve 21 which are sequentially arranged; the rear section 111 of the first bearing lubrication liquid supply path comprises a pressure regulating valve 10 and a second filter 9 which are arranged in sequence.
The refrigeration system includes a plurality of circulation paths, for example, a liquid circulation path and a gas circulation path, the circulation paths include a plurality of transfer members, for example, check valves, filters, pumps, and the like, and communication lines, through which liquid or gas can pass, and the communication lines communicate adjacent transfer members to allow the liquid or gas to flow.
For example, the first filter 35, the refrigerant liquid pump 22, and the second check valve 21 included in the front stage path of the second bearing lubrication liquid supply path are connected by a communication line, the refrigerant liquid pump 22 and the second check valve 21 are connected by a communication line, and the first filter is connected by a communication line to the transmission member disposed in front of the first filter.
The refrigerant liquid passes through the first check valve 11, the pressure regulating valve 10 and the second filter 9 in sequence in the process of flowing in the first bearing lubrication liquid supply path. And in the process of circulating in the second bearing lubricating liquid supply path, the refrigerant liquid sequentially passes through the first filter 35, the refrigerating liquid pump 22, the second one-way valve 21, the pressure regulating valve 10 and the second filter 9.
Wherein, each transmission part in the two liquid supply paths has the following functions: the first check valve 11 is configured to prevent reverse flow of refrigerant liquid in the forward path 105 of the first bearing lubrication liquid supply path; the second check valve 21 is configured for preventing reverse flow of refrigerant liquid in the forward path 103 of the second bearing lubrication liquid supply path; the first filter 35 is configured to filter small amounts of contaminants, such as solid particulates, in the refrigerant liquid in the front end path 103 of the second bearing lubrication liquid supply path; the second filter 9 is configured to filter small amounts of contaminants, such as solid particles, from the refrigerant liquid in the back end path 111 of the first bearing lubrication liquid supply path; the pressure regulating valve 10 is configured to regulate pressure in the back end path 111 of the first bearing lubrication supply path to fix the pressure.
In some embodiments, the number of the refrigerant liquid pumps included in the front-stage path of the second bearing lubrication liquid supply path is at least two, and at least two refrigerant liquid pumps are arranged in parallel. For example, as shown in fig. 3, the number of refrigeration liquid pumps is two, respectively a first liquid pump 221 and a second liquid pump 222 arranged in parallel.
The plurality of refrigerating liquid pumps which are connected in parallel are arranged on the second bearing lubricating liquid supply path, so that the condition that liquid cannot be supplied to the bearing when one or more refrigerating liquid pumps break down or are overloaded in the system operation process can be avoided, the path of the refrigerating liquid pump which normally runs can be rapidly switched when the condition occurs, and the normal realization of liquid supply to the bearing is ensured.
In some embodiments, the end of the rear section of the first bearing lubrication supply path is divided into two branches: a bearing lubrication liquid supply branch path 112 and a bearing lubrication liquid supply branch path 113; the two branches are configured for lubricating two oppositely arranged bearings 3 in the electric machine 4.
The refrigeration system 32 further includes a first liquid supply source and a second liquid supply source, as shown in fig. 4, the first liquid supply source is a first liquid supply bag 13 disposed below the condenser 19, and the first liquid supply bag 13 is connected to the condenser 19 and is used for storing the refrigerant liquid in the condenser 19; and the front section path 105 of the first bearing lubrication liquid supply path is communicated with the first liquid supply sac 13.
As shown in fig. 5, the second liquid supply source is a refrigerant liquid isolation tank 30, the second bearing lubrication liquid supply path further includes a primary path (120, 121, 122, 123) and the primary path is a liquid supply path from the evaporator 29 to the refrigerant liquid isolation tank 30; the front section of the second bearing lubrication liquid supply path is connected with the refrigerant liquid isolation tank 30.
The initial path of the second bearing lubrication liquid supply path comprises a third filter 40, a pump 39 and a check valve 20, the third filter 40 and the pump 39 are sequentially arranged between the evaporator 29 and the refrigerant liquid isolation tank 30, and the check valve 20 is connected with the pump 39 in parallel. Wherein, the first section route of the lubricated confession liquid route of second bearing includes: a liquid supply path 120 of the evaporator 29 to the refrigerant liquid isolation tank 30, a liquid supply branch path 122 of a one-way valve and a liquid supply branch path 121 of a pump; and the check valve supply branch path 122 and the pump supply branch path 121 merge into the evaporator 29 to supplement the refrigerant liquid path 123 to the refrigerant liquid isolation tank 30.
Wherein the third filter 40 is configured for filtering solid particles in the refrigerant liquid; the check valve 20 is configured for preventing backflow of refrigerant liquid; the above-described pump 39 is configured to: if the refrigerant liquid in the refrigerant liquid isolation tank 30 is insufficient, the pump 39 is started to forcibly extract the refrigerant liquid from the evaporator 29 to fill the refrigerant liquid isolation tank 30 with the refrigerant liquid, so that the bearing 3 is always lubricated by sufficient refrigerant liquid.
When the refrigerant liquid in the refrigerant liquid isolation tank 30 is sufficient, the refrigerant liquid flows into the refrigerant liquid isolation tank 30 from the evaporator 29 to the refrigerant liquid isolation tank 30 to form a liquid supply path 120, and then flows into a refrigerant liquid isolation tank 30 through a one-way valve liquid supply branch path 122 and a supplementary refrigerant liquid path 123 of the evaporator 29 to the refrigerant liquid isolation tank 30; if the refrigerant liquid in the refrigerant liquid isolation tank 30 is insufficient, the pump 39 is started to forcibly extract the refrigerant liquid from the evaporator 29 to fill the refrigerant liquid isolation tank 30 with the refrigerant liquid, so that the bearing 3 is always lubricated by sufficient refrigerant liquid.
The refrigeration system 32 also includes a gas balancing line 104 that communicates the evaporator 29 with the refrigerant liquid isolation tank 30, and the gas balancing line 104 includes the solenoid valve 38. The gas balance line 104 described above allows the pressure in the refrigerant liquid isolation tank 30 and the evaporator 29 to be maintained equal.
In some embodiments, as shown in fig. 6 and 7, the refrigeration system 32 further comprises: a bearing lubrication return fluid or air path 118 from the compressor 42 to the evaporator 29 and a first exhaust path 119 from the compressor 42 to the condenser 19.
Wherein, the above-mentioned refrigerating system 32 further includes: a first pressure sensor 15, a second pressure sensor 34, a third pressure sensor 8, a fourth pressure sensor 33, and a fifth pressure sensor 5; the first pressure sensor 15 is connected with the condenser 19 and is used for collecting the pressure value of the condenser 19; the second pressure sensor 34 is connected with the evaporator 29 and used for acquiring the pressure value of the evaporator 29; the third pressure sensor 8 is connected with the rear section path of the first condensing agent liquid supply path and is used for collecting the pressure value of the bearing liquid supply; the fourth pressure sensor 33 is connected with the bearing lubrication liquid return or air return path 118 and is used for acquiring the pressure value of the bearing lubrication liquid return or air return; and a fifth pressure sensor 5 connected with the exhaust port of the compressor 42 for collecting the compressor discharge pressure.
The above-mentioned refrigerating system still includes: a first level sensor 17, a second level sensor 24, a third level sensor 37, a first temperature sensor 6 and a second temperature sensor 7; the first liquid level sensor 17 is used for monitoring the liquid level of the condenser 19; the second level sensor 24 is used to monitor the level of the economizer 25; a third level sensor 37 is used to monitor the level of the refrigerant liquid isolation tank 30; the first temperature sensor 6 is used to monitor the temperature of the compressor 42 in the discharge path 119 to the condenser 19; the second temperature sensor 7 is configured to monitor a temperature of the trailing portion 111 of the first bearing lubrication supply path, i.e., the trailing portion of the first bearing lubrication supply path.
In some embodiments, the refrigeration system 32 may select one of two bearing lubrication supply paths at different stages of operation as follows:
wherein the first bearing lubrication supply path is configured to provide a pressure differential Δ P across the refrigeration system 32 that is greater than the pressure differential Δ P of the bearing supply brg While providing refrigerant liquid to the bearings of the compressor 42; a second bearing lubrication supply path for providing a pressure differential Δ P less than or equal to the pressure differential Δ P of the bearing supply at the refrigeration system 32 brg At this time, refrigerant liquid is supplied to the bearings of the compressor 42.
Wherein the pressure difference Δ P of the refrigeration system 32 is the pressure value P of the condenser 19 1 With the pressure value P of the evaporator 29 2 Difference, pressure difference Δ P of bearing feed liquid brg Pressure value P of liquid supply for bearing 3 Pressure value P of lubricating return liquid or return air of bearing 4 The difference between them.
When Δ P is less than or equal to Δ P brg When the bearing is lubricated by supplying liquid to the bearing only by the insufficient pressure difference of the refrigerating system 32, the refrigerant liquid pump 22 is kept to supply liquid to the bearing for lubrication, namely, the liquid is supplied forcibly; when Δ P is>ΔP brg At this time, the pressure difference of the refrigeration system 32 is sufficient to supply liquid for the bearings for lubrication, and at this time, the refrigerant liquid pump 22 is turned off, and only the pressure difference Δ P of the refrigeration system is used as a power source for supplying liquid for lubrication of the bearings, that is, the pressure difference naturally supplies liquid.
As shown in fig. 7, the refrigeration system 32 further includes: a first discharge path 119 from the compressor 42 to the condenser 19; a second discharge path 102 from the evaporator 29 to the compressor 42; a motor 4 cooling feed liquid path 108 from the condenser 19 to the compressor 42; a refrigerant supply path 106 from the condenser 19 to the economizer 25; a make-up air path 117 from the economizer 25 to the compressor 42; a return path 107 from the economizer 25 to the evaporator 29; the motor from the compressor 42 to the evaporator 29 cools the return air path 116.
In some embodiments, the motor-cooled return air path 116 from the compressor 42 to the evaporator 29 described above is split into two motor-cooled return air paths: a motor cooling return air branch path 114 and a motor cooling return air branch path 115.
In some embodiments, the refrigeration system 32 further comprises: a second liquid supply bag 14 arranged below the condenser 19, wherein the second liquid supply bag 14 is connected with the condenser 19 and is used for storing the refrigerant liquid in the condenser 19; the motor cooling liquid supply path 108 and the refrigerant liquid supply path 106 are both connected to the second liquid supply pocket 14.
The condenser 19 is connected to two fluid supply pockets, wherein a first fluid supply pocket is connected to the first bearing lubrication fluid supply path for providing refrigerant fluid to the bearings in the compressor as a lubricant, and the lubricated refrigerant (liquid or gas) is returned to the evaporator 29 along the bearing lubrication fluid return or gas return path 118.
The second liquid supply bladder 14 is connected to the motor cooling liquid supply path 108 and said refrigerant liquid supply path 106 for providing refrigerant liquid to the economizer which then exchanges heat from the refrigerant liquid to produce refrigerant gas which is then fed along a gas make-up path 117 to the compressor for gas make-up, while the remaining refrigerant liquid in the economizer 25 is fed along a liquid return path 107 to the evaporator 29. Meanwhile, the second liquid supply bag 14 is also used for supplying refrigerant liquid to the motor in the compressor for motor cooling, and the cooled refrigerant (liquid or gas) returns to the evaporator through the motor cooling return air path 116.
The first exhaust path 119 from the compressor 42 to the condenser 19 is communicated from the compressor 42 to the condenser 19 via the exhaust check valve 16 on the condenser 19; the second exhaust path 102 from the evaporator 29 to the compressor 42 is connected from the shutoff valve 28 of the evaporator 29 to the compressor 42 via the suction shutoff valve 31; the motor cooling liquid supply path 108 from the condenser 19 to the compressor 42 is connected from the second liquid supply bag 14 below the condenser 19 to the compressor 42 sequentially through the dry filter 18 and the first electric regulating valve 36, and the cooling liquid supply path 108 is branched at the tail end into a cooling liquid supply branch path 109 and a cooling liquid supply branch path 110; a refrigerant liquid supply path 106 from the condenser 19 to the economizer 25 is communicated from the second liquid supply bag 14 below the condenser 19 to the economizer 25 through the second electric regulating valve 41 and the first throttling orifice plate 23 in sequence; the liquid return path 107 from the economizer 25 to the evaporator 29 is connected from the economizer 25 to the evaporator 29 via the third electric control valve 26 and the second orifice 27 in this order.
The utility model discloses an including the lubricated confession liquid route of bearing of two kinds of differences among the refrigerating system that some embodiments provided, two bearing lubrication supply liquid routes are applied to in the different stages of refrigerating system operation, and the whole stage of refrigerating system operation specifically includes:
(1) Starting a refrigeration system;
(2) The refrigerating system stably operates;
(3) The refrigeration system is normally powered off and shut down;
(4) The refrigeration system is abnormally powered off and stopped (sudden power off and stop).
The stage (1) and the stage (3) adopt a refrigerating liquid pump forced liquid supply mode, the stage (2) needs to judge the pressure difference of a refrigerating system and the pressure difference of bearing liquid supply to determine two liquid supply modes of refrigerating liquid pump forced liquid supply and refrigerating system pressure difference natural liquid supply to be connected in parallel or to operate independently, and the stage (4) adopts a refrigerating system pressure difference natural liquid supply mode in advance, and if the pressure difference is insufficient, an emergency standby power supply is started, and then the refrigerating liquid pump forced liquid supply mode is adopted. The operation of each stage will be described in detail below.
1) Starting a refrigerating system:
refrigerant liquid will accumulate in large quantities in the evaporator 29 and condenser 19 of the refrigeration system before the entire refrigeration system 32 is started. The pressure equalization tube line path 104 between the evaporator 29 and the refrigerant liquid isolation tank 30 is in a conductive state so that the pressure in the refrigerant liquid isolation tank 30 and the evaporator 29 is always equal, and since the refrigerant liquid isolation tank 30 has a much smaller volume than the evaporator 29 and the refrigerant liquid isolation tank 30 is at a lower-middle position in the system, the refrigerant liquid accumulated in the evaporator 29 will pass through the filter 40 along the path 120 and fill the refrigerant liquid isolation tank 30 along the paths 122, 123 through the check valve 20, the gas in the refrigerant liquid isolation tank 30 will also be discharged into the evaporator 29 along the pressure equalization tube line path 104, and through this process, the refrigerant liquid isolation tank 30 will be filled with the refrigerant liquid. In the above process, the level sensor 37 monitors the liquid level of the refrigerant liquid isolation tank 30 in real time, even if the refrigerant liquid isolation tank 30 cannot be filled by the above path, at this time, the pump 39 is started to forcibly draw the refrigerant liquid from the evaporator 29, pass through the filter 40 along the path 120, and then pass through the pump 39 along the path 121 to be conveyed to the path 123 to enter the refrigerant liquid isolation tank 30 to fill the refrigerant liquid.
When the refrigeration system 32 starts, the refrigerant liquid pump 22 is turned on, the refrigerant liquid pump 22 pumps the refrigerant liquid from the refrigerant liquid isolation tank 30 filled with the refrigerant liquid continuously, the refrigerant liquid passes through the filter 35, the check valve 21, the pressure regulating valve 10 and the filter 9 along the liquid guiding path 103 to the path 111, then the refrigerant liquid is divided into two paths 112 and 113 to lubricate the bearings 3 on the left side and the right side of the compressor, after the bearings 3 are lubricated, the rotor gradually and stably rotates, the refrigeration system 32 is started, and the lubricated refrigerant returns to the evaporator 29 through the pressure sensor 33 and the electromagnetic valve 12 along the path 118. During the whole process, the liquid level sensor 37 monitors the liquid level of the refrigerant liquid isolation tank 30 in real time, and if the liquid level of the refrigerant liquid isolation tank 30 is monitored to be insufficient, the pump 39 is started to forcibly extract the refrigerant liquid from the evaporator 29 to fill the refrigerant liquid isolation tank 30 with the refrigerant liquid, so that the bearing 3 is always lubricated by sufficient refrigerant liquid.
2) The refrigeration system gradually and stably operates:
as shown in fig. 9, after the system is started, the refrigerant liquid in the evaporator 29 undergoes evaporation phase change, the refrigerant gas generated by phase change is conveyed to the path 101 along the gas transmission path 102, at the suction port of the compressor, the source of the refrigerant gas is continuously sucked and compressed by the first-stage impeller 1 in the compressor, and then compressed by the second-stage impeller 2, after the compression is completed, the refrigerant gas is discharged from the discharge port of the second-stage impeller 2, and enters the condenser 19 along the discharge line 119 of the compressor to undergo condensation phase change, the refrigerant liquid generated by condensation phase change enters the economizer 25 after passing through the electric regulating valve 41 and the orifice plate 23 along the path 106, the refrigerant gas generated by flash evaporation of the refrigerant liquid in the economizer 25 enters the compressor to perform air make-up along the air make-up path 117, and the remaining liquid in the economizer 25 enters the evaporator through the electric regulating valve 26 and the orifice plate 27 along the path 107 to complete a cycle. In the process, the electric control valve 41 can be correspondingly adjusted according to the liquid level of the condenser monitored by the liquid level sensor 17, and when the liquid level in the condenser 19 is too low, the opening degree of the electric control valve 41 can be reduced, so that the liquid supply amount of the condenser 19 to the economizer 25 is reduced, and the liquid level in the condenser 19 is restored to the allowable value again.
In the initial stage of the operation of the refrigeration system 32, the pressure difference between the condenser 19 and the evaporator 29 in the refrigeration system 32 is small, at this time, the refrigerant liquid pump 22 is still in an open state, the refrigerant liquid is continuously pumped by the refrigerant liquid pump 22 from the refrigerant liquid isolation tank 30 filled with the refrigerant liquid, the refrigerant liquid passes through the filter 35, the check valve 21, the pressure regulating valve 10 and the filter 9 along the liquid guiding path 103 to the path 111, then the refrigerant liquid is divided into two paths 112 and 113 to lubricate the left and right side bearings 3 in the compressor, and the lubricated refrigerant returns to the evaporator 29 through the pressure sensor 33 and the electromagnetic valve 12 along the path 118. During the whole process, the liquid level sensor 37 monitors the liquid level of the refrigerant liquid isolation tank 30 in real time, and if the liquid level of the refrigerant liquid isolation tank 30 is monitored to be insufficient, the pump 39 is started to forcibly draw the refrigerant liquid from the evaporator 29 to fill the refrigerant liquid isolation tank 30 with the refrigerant liquid. The pressure regulating valve 10 is used for regulating the pressure of the liquid pumped by the refrigerating liquid pump 22 and the pressure difference of the bearing liquid supply to be not less than the set minimum pressure difference of the bearing liquid supply, so that the pressure difference fluctuation caused by the forced liquid supply opening or closing of the refrigerating liquid pump 22 is not too large, and the impact influence on the operation of a refrigerating system is reduced.
During the gradual steady operation of the refrigeration system 32, the pressure sensor 15 and the pressure sensor 34 are required to acquire the pressure value between the condenser 19 and the evaporator 29 in real time, which is P respectively 1 、P 2 (ii) a In addition, a pressure sensor 8 and a temperature sensor are required7 real-time collecting bearing liquid supply pressure P 3 Temperature T 3 The pressure sensor 33 collects the pressure P of the liquid or gas return of the bearing in real time 4 . Setting the difference value between the data collected by the pressure sensors 15 and 34 as the differential pressure of the refrigeration system delta P = P 1 -P 2 Setting the difference between the data collected by the pressure sensors 8 and 33 as the bearing liquid supply pressure difference delta P brg =P 3 -P 4 . As the operation of the refrigeration system 32 becomes more stable, the pressure difference between the condenser 19 at the high pressure side and the evaporator 29 at the low pressure side will gradually increase, and Δ P will tend to a stable value, and Δ P will be compared in real time during the whole process brg When Δ P is less than or equal to Δ P brg When the pressure difference of the refrigerating system 32 is insufficient, the bearing is lubricated by liquid supply, and the refrigerating liquid pump 22 is kept to supply liquid for the bearing lubrication forcibly; when Δ P is measured>ΔP brg When the pressure difference of the refrigerating system 32 is enough to supply liquid for the bearings for lubrication, the refrigerating liquid pump 22 is closed, only the pressure difference deltap of the refrigerating system is used as a power source for supplying liquid for lubrication of the bearings, and at the moment, the refrigerant liquid flows from the bearing liquid supply bag 13 below the condenser 19 to the path 111 along the path 105 through the check valve 105, the pressure regulating valve 10 and the filter 9, and then is divided into two paths 112 and 113 to lubricate the bearings 3 on the left side and the right side in the compressor.
When only the differential pressure delta P of the refrigeration system is used as a bearing liquid supply lubrication power source, the liquid level of the condenser 19 is monitored by the liquid level sensor 17 in real time, and when the liquid level of the condenser 19 is too low and the bearing liquid supply bag 13 does not contain enough refrigerant liquid, the refrigeration liquid pump 22 is started again at the moment, and the pump is used for forcibly supplying liquid; in addition, when the operation of the refrigeration system 32 fluctuates, the operating pressure difference Δ P of the refrigeration system also fluctuates, and at this time, it is still necessary to compare Δ P with Δ P in real time brg Once Δ P ≦ Δ P brg The refrigerant liquid pump 22 is also turned on to supply liquid by force.
3) The normal shutdown of the refrigerating system:
as shown in fig. 10, the refrigeration liquid pump 22 needs to be started and the pump is used to forcibly supply liquid for a certain time before the refrigeration system 32 is stopped, and at this time, the pressure regulating valve 10 is regulated to regulate the liquid pressure pumped by the refrigeration liquid pump 22 and the pressure difference of the bearing liquid supply so as to be not less than the set minimum pressure difference of the bearing liquid supply, so that the pressure difference fluctuation caused by the opening or closing of the forced liquid supply of the refrigeration liquid pump 22 is not too large, and the impact influence on the operation of the refrigeration system is reduced. This condition ensures that the bearings 3 in the compressor are continuously lubricated with sufficient refrigerant liquid.
After system shutdown, refrigerant will build up in the evaporator 29 due to the reduced compressor suction but a large refrigerant system pressure differential Δ P will still exist across the refrigerant system 32. The refrigerant liquid pump 22 is maintained in operation for a period of time such that it is able to continue pumping liquid from the refrigerant liquid isolation tank 30 to the bearings 3 in the compressor, and the increasing accumulation of refrigerant liquid in the evaporator 29 also continues to replenish the refrigerant liquid isolation tank 30 with refrigerant liquid. After a period of compressor power off, the rotor stops completely and the bearings no longer require lubricating fluid, at which point the refrigeration fluid pump 22 stops working and no longer pumps fluid and the refrigeration system 32 shuts down safely.
4) Abnormal shutdown (e.g., sudden power outage) of the refrigeration system:
as shown in fig. 10, when the refrigeration system 32 is shut down due to sudden power failure, the pump 22 is not used at this time, but the exhaust check valve 16 prevents the high-pressure gas in the condenser from flowing back to the interior of the compressor, so the refrigeration system pressure difference Δ P between the condenser 19 and the evaporator 29 is still maintained at a relatively large value, and at this time, the refrigerant liquid is subjected to emergency bearing liquid supply by the refrigeration system pressure difference still existing in the system, and the refrigerant liquid passes from the bearing liquid supply bag 13 below the condenser 19 along the path 105 through the check valve 105, the pressure regulating valve 10 and the filter 9 to the path 111, and then is divided into two paths 112 and 113 to lubricate the left and right bearings 3 in the compressor. However, due to the power failure and shutdown, the system circulation stops, the high pressure of the condenser 19 and the low pressure of the evaporator 29 are gradually balanced through the pipeline communication, namely, the process of supplying liquid to the bearing 3 only by the pressure difference delta P of the refrigeration system can last about 15-20s, but the motor rotor in the permanent magnet motor can be completely stopped within 5-10s generally, so that the method of lubricating the bearing by adopting the emergency liquid supply is still reliable under the occasion of adopting the permanent magnet motorIs effective. If the refrigerating system pressure difference Δ P between the condenser 19 and the evaporator 29 is small in the original non-stop operating state, i.e. the refrigerating system pressure difference Δ P<Bearing feed liquid pressure difference delta P brg At this time, the power is suddenly cut off and the machine is stopped, the bearing can not be supplied with liquid only by the pressure difference delta P of the refrigeration system, the refrigeration liquid pump in the scheme can preferably use a UPS power supply to supply power, the refrigeration liquid pump 22 can be started to operate, so that the refrigeration liquid pump can continuously pump liquid for the bearing 3 in the compressor from the refrigerant liquid isolating tank 30, and in the gradual balancing process of high pressure and low pressure, the refrigerant liquid gradually accumulated and increased in the evaporator 29 can also continuously supplement the refrigerant liquid for the refrigerant liquid isolating tank 30, so that the refrigeration liquid pump 22 can always pump enough liquid for the bearing 3 to lubricate the bearing, and the process is continued until the rotor completely stops rotating. In the shutdown process, the electromagnetic valve 12 is switched from the original normally open state to the closed state, so that the air return path of the bearing is closed and cut off, and a certain amount of refrigerant liquid can still be stored in the bearing cavity of the bearing 3 in the compressor within a certain time, thereby improving the safety and reliability of the operation of the bearing after shutdown.
The utility model discloses applied two kinds of different bearing lubrication and supply liquid routes, realized stable and reliable's complete stage bearing and supplied liquid, set up corresponding communicating pipe way and power device (pump) in the system, according to the running state of the refrigerating system who obtains of judgement, select different liquid sources of getting in the refrigerating system, select different refrigerant liquid supply liquid routes for bearing lubrication and supply liquid; and the adopted liquid supply path switching mode ensures that the bearing in the compressor can obtain sufficient refrigerant liquid for lubrication at each stage, and the safety of system operation is ensured.
The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or replacements within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An oilless bearing feed air conditioning system, comprising:
a box system;
a refrigeration system located within the tank system, the refrigeration system comprising: a compressor, a condenser, an evaporator, and an economizer;
a first liquid supply bag and a second liquid supply bag are arranged below the condenser; the first liquid supply bag and the second liquid supply bag are respectively communicated with the condenser and used for storing refrigerant liquid in the condenser;
the first liquid supply sac is communicated with the compressor to form a first bearing lubrication liquid supply path, and the first bearing lubrication liquid supply path is used for lubricating a bearing in the compressor;
the second liquid supply sac is communicated with the compressor to form a motor cooling liquid supply path, and the motor cooling liquid supply path is used for cooling a motor in the compressor;
the second liquid supply bag is communicated with the economizer to form a refrigerant liquid supply path, and the refrigerant liquid supply path is used for supplying refrigerant liquid to the economizer;
the economizer is communicated with the compressor to form an air replenishing path, and the air replenishing path is used for replenishing air to the compressor.
2. An oilless bearing feed air conditioning system as claimed in claim 1, wherein the refrigeration system further comprises a second bearing lubrication feed path from the evaporator to the compressor;
the second bearing lubrication supply path is for delivering refrigerant liquid to the compressor to lubricate a bearing in the compressor.
3. An oilless bearing feed air conditioning system as claimed in claim 2,
the first bearing lubrication liquid supply path comprises a front section path and a rear section path which are communicated;
the second bearing lubricating liquid supply path comprises a front section path and a rear section path which are communicated with each other;
the rear section path of the first bearing lubrication liquid supply path and the rear section path of the second bearing lubrication liquid supply path are the same path.
4. An oilless bearing liquid supply air conditioning system as claimed in claim 3, wherein a forward section of the first bearing lubrication liquid supply path includes a first check valve; the front section path of the second bearing lubricating liquid supply path comprises a first filter, a refrigerating liquid pump and a second one-way valve which are sequentially arranged;
the rear section path of the first bearing lubrication liquid supply path comprises a pressure regulating valve and a second filter which are arranged in sequence.
5. An oilless bearing liquid supply air conditioning system as claimed in claim 4, wherein the number of the refrigeration liquid pumps is at least two, at least two of the refrigeration liquid pumps being arranged in parallel; the refrigeration liquid pump is powered by an uninterruptible power supply.
6. An oilless bearing liquid supply air conditioning system as claimed in any of claims 3 to 5, wherein the refrigeration system further comprises a refrigerant liquid isolation tank, the refrigerant liquid isolation tank being in communication with the evaporator; and the front section path of the second bearing lubricating liquid supply path is communicated with the refrigerant liquid isolation tank.
7. An oilless bearing liquid supply air conditioning system as claimed in claim 6, wherein the refrigeration system further comprises: a first discharge path from the compressor to the condenser;
a second exhaust path from the evaporator to the condenser;
a liquid return path from the economizer to the evaporator;
a bearing lubrication return fluid or return air path from the compressor to the evaporator.
8. An oilless bearing feed air conditioning system as claimed in claim 7, wherein the refrigeration system further comprises:
the first pressure sensor is connected with the condenser and used for collecting a pressure value of the condenser;
the second pressure sensor is connected with the evaporator and is used for collecting the pressure value of the evaporator;
the third pressure sensor is connected with the rear section path of the first bearing lubrication liquid supply path and used for acquiring the pressure value of bearing liquid supply;
the fourth pressure sensor is connected with the bearing lubrication liquid return or air return path and used for acquiring the pressure value of the bearing lubrication liquid return or air return;
a first liquid level sensor for monitoring a liquid level of the condenser;
a second level sensor for monitoring a level of the economizer;
a third level sensor for monitoring a level of the refrigerant liquid isolation tank.
9. An oilless bearing liquid supply air conditioning system as claimed in claim 8,
and a second electric regulating valve is arranged on the refrigerant liquid supply path and used for regulating the refrigerant quantity in the condenser according to the value of the first liquid level sensor.
10. An oilless bearing liquid supply air conditioning system as claimed in claim 9, wherein the refrigeration system further comprises:
a first temperature sensor for monitoring a temperature of the first exhaust path;
and the second temperature sensor is used for monitoring the temperature of the rear section path of the first bearing lubrication liquid supply path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222915789.6U CN218544616U (en) | 2022-11-02 | 2022-11-02 | Oilless bearing liquid supply air conditioning system |
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| CN202222915789.6U CN218544616U (en) | 2022-11-02 | 2022-11-02 | Oilless bearing liquid supply air conditioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024178919A1 (en) * | 2023-03-01 | 2024-09-06 | 青岛海信日立空调系统有限公司 | Air conditioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024178919A1 (en) * | 2023-03-01 | 2024-09-06 | 青岛海信日立空调系统有限公司 | Air conditioning system |
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