CN111365910A - Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment - Google Patents
Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment Download PDFInfo
- Publication number
- CN111365910A CN111365910A CN201811599012.5A CN201811599012A CN111365910A CN 111365910 A CN111365910 A CN 111365910A CN 201811599012 A CN201811599012 A CN 201811599012A CN 111365910 A CN111365910 A CN 111365910A
- Authority
- CN
- China
- Prior art keywords
- refrigerant
- flow path
- heat exchanger
- bearing
- circulation system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 132
- 239000003507 refrigerant Substances 0.000 title claims abstract description 128
- 238000005057 refrigeration Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 64
- 238000004781 supercooling Methods 0.000 claims description 31
- 239000002826 coolant Substances 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a refrigerant circulating system and refrigeration equipment. The refrigerant circulating system comprises a main circulating flow path and a bearing cooling flow path, the main circulating flow path comprises a compressor, a first heat exchanger, a four-way valve and a second heat exchanger which are sequentially arranged, the bearing cooling flow path comprises a first liquid taking flow channel connected with the first heat exchanger, a second liquid taking flow channel connected with the second heat exchanger, a refrigerant supply flow channel for supplying refrigerant to a bearing of the compressor and a switching valve, and the switching valve controls the refrigerant supply flow channel to be selectively communicated with at least one of the first liquid taking flow channel and the second liquid taking flow channel. The switching valve is arranged on the bearing cooling flow passage to change the liquid taking position of the refrigerant supply flow passage, so that the liquid taking position of the refrigerant circulating system can be freely switched to meet the bearing cooling requirements under the refrigeration and heating double working conditions.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigerant circulation system with switchable liquid taking positions and refrigeration equipment.
Background
At present, a new refrigerant technology and an oilless bearing technology are two new technologies in the technical field of refrigeration and gradually become a new development trend. In recent years, refrigerant R1233zd (E) has been used as a new refrigerant by various companies. Compared with the traditional oil bearing, the oilless bearing does not need to be provided with an oil circuit system, and the structure of the whole oil bearing system is greatly simplified. But like oil bearings, cooling is also required for the sustainable operation of oil-free bearings. The most direct method for a fresh refrigerant centrifuge is to cool the oilless bearing with a system refrigerant, such as refrigerant R1233zd (E). However, in the existing bearing cooling scheme, only the bearing cooling under the cooling working condition is considered, and the bearing cooling under the heating working condition is not considered, so that the application range is limited.
Disclosure of Invention
The invention aims to provide a refrigerant circulating system and refrigeration equipment so as to better meet the requirement of bearing cooling under the refrigeration and heating double working conditions.
In a first aspect, the present invention provides a refrigerant circulation system, including:
the main circulation flow path comprises a compressor, a first heat exchanger, a four-way valve and a second heat exchanger which are arranged in sequence; and
and the bearing cooling flow path comprises a first liquid taking flow channel connected with the first heat exchanger, a second liquid taking flow channel connected with the second heat exchanger, a refrigerant supply flow channel for supplying refrigerant to the bearing of the compressor and a switching valve, wherein the switching valve controls the refrigerant supply flow channel to be selectively communicated with at least one of the first liquid taking flow channel and the second liquid taking flow channel.
In some embodiments, the bearing cooling flow path further includes a first branch and a second branch disposed between the switching valve and the refrigerant supply flow channel, and a booster pump is disposed on one of the first branch and the second branch.
In some embodiments, the booster pump is a variable frequency booster pump.
In some embodiments, the bearing cooling flow path further comprises a first throttle valve disposed on the first branch and the second branch.
In some embodiments, the bearing cooling flow path further comprises a filtering device disposed on the first and second branches.
In some embodiments, the switching valve comprises a four-way switching valve, two inlets of the four-way switching valve are respectively connected with the first liquid taking flow passage and the second liquid taking flow passage, and two outlets of the four-way switching valve are respectively connected with the first branch passage and the second branch passage.
In some embodiments, the bearing cooling flow path further includes a supercooling heat exchanger for cooling the refrigerant of the refrigerant supply flow channel.
In some embodiments, a liquid taking flow channel, which is communicated with the refrigerant supply flow channel, of the first liquid taking flow channel and the second liquid taking flow channel is a condenser liquid taking flow channel, the bearing cooling flow channel further comprises a supercooling flow channel communicated with the condenser liquid taking flow channel, the supercooling flow channel is provided with a second throttle valve, and the supercooling flow channel and the refrigerant supply flow channel exchange heat inside the supercooling heat exchanger.
In some embodiments, inside the supercooling heat exchanger, the flow directions of the refrigerant on the supercooling flow channel and the refrigerant supply flow channel are opposite.
In some embodiments, the bearing cooling flow path further comprises a flow dividing valve connected with the switching valve and the supercooling flow path to divide part of the refrigerant on the condenser liquid taking flow path to the supercooling flow path.
In some embodiments, the bearing cooling flow path further includes a check valve disposed between the coolant supply channel and the bearing, wherein the check valve prevents the coolant in the bearing from flowing to the coolant supply channel.
In some embodiments, one of the first heat exchanger and the second heat exchanger is an evaporator, and the other is a condenser, and the bearing cooling flow path further includes a balance flow passage for circulating a gaseous refrigerant in the bearing to the evaporator or a suction port of the compressor.
In some embodiments, the balancing channel may be on-off.
In some embodiments, the bearing cooling flow path further comprises a flash tank, and the flash tank is in fluid communication with the bearing to separate the refrigerant after cooling the bearing into gas and liquid.
In some embodiments, one of the first heat exchanger and the second heat exchanger is an evaporator, and the other is a condenser, and the bearing cooling flow path further comprises an air make-up flow path and a throttling device arranged between the flash tank and the evaporator.
In some embodiments, the refrigerant circulation system further includes a first liquid level sensor for detecting a liquid level of the refrigerant in the first heat exchanger and a second liquid level sensor for detecting a liquid level of the refrigerant in the second heat exchanger, the switching valve is coupled to the first liquid level sensor and the second liquid level sensor, and when the main circulation flow path is in a cooling state, the switching valve controls the refrigerant supply flow path to communicate with the first liquid taking flow path or the second liquid taking flow path according to the liquid levels detected by the first liquid level sensor and the second liquid level sensor.
In some embodiments, the compressor is a centrifugal compressor.
In a second aspect, the present invention provides a refrigeration apparatus including the refrigerant circulation system provided in any one of the first aspect of the present invention.
Based on the technical scheme provided by the invention, the refrigerant circulating system comprises a main circulating flow path and a bearing cooling flow path, the main circulating flow path comprises a compressor, a first heat exchanger, a four-way valve and a second heat exchanger which are sequentially arranged, the bearing cooling flow path comprises a first liquid taking flow channel connected with the first heat exchanger, a second liquid taking flow channel connected with the second heat exchanger, a refrigerant supply flow channel for supplying refrigerant to the bearing of the compressor and a switching valve, and the switching valve controls the refrigerant supply flow channel to be selectively communicated with at least one of the first liquid taking flow channel and the second liquid taking flow channel. When the main circulation flow path is in a refrigerating state, the switching valve controls the refrigerant supply flow path to be communicated with the first liquid taking flow path, namely liquid is taken from the first heat exchanger; when the load of the bearing is overlarge, the switching valve can also control the refrigerant supply channel to be communicated with the first liquid taking channel and the second liquid taking channel, namely the first heat exchanger and the second heat exchanger take liquid dually; in summary, in the refrigerant circulation system of the present invention, the switching valve is disposed on the bearing cooling flow path to change the liquid-taking position of the refrigerant supply flow path, so that the liquid-taking position of the refrigerant circulation system can be freely switched to meet the bearing cooling requirements under the dual working conditions of cooling and heating.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic structural diagram of a refrigerant circulation system according to an embodiment of the present invention.
Each reference numeral represents:
1. a first heat exchanger; 2. a pressure gauge; 3. a compressor; 4. a second heat exchanger; 5. a first liquid level sensor; 6. a second liquid level sensor; 7. a switching valve; 8. a pressure gauge; 9. a pressure gauge; 10. a booster pump; 11. a first throttle valve; 12. a second throttle valve; 13. a filtration device; 14. an on-off control valve; 16. a subcooling heat exchanger; 17. a one-way valve; 19. a bearing; 25. a flow divider valve; 26. a flash tank; 28. a throttling device; 31. an air supplement port; A. a first liquid taking flow channel; B. a second liquid taking flow channel; C. a first branch; D. a second branch circuit; E. a refrigerant supply flow passage; F. a supercooling flow channel; G. a balance flow channel; H. the air supply flow passage.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, the refrigerant circulation system according to the embodiment of the present invention includes:
the main circulation flow path comprises a compressor 3, a first heat exchanger 1, a four-way valve and a second heat exchanger 4 which are arranged in sequence; and
and the bearing cooling flow path comprises a first liquid taking flow channel A connected with the first heat exchanger 1, a second liquid taking flow channel B connected with the second heat exchanger 4, a refrigerant supply flow channel E for supplying a refrigerant to a bearing 19 of the compressor 3 and a switching valve 7, wherein the switching valve 7 controls the refrigerant supply flow channel E to be selectively communicated with at least one of the first liquid taking flow channel A and the second liquid taking flow channel B.
When the main circulation flow path is in a refrigeration state, the switching valve 7 controls the refrigerant supply flow path E to be communicated with the first liquid taking flow path a, namely, liquid is taken from the first heat exchanger 1 (at the moment, the first heat exchanger 1 is a condenser); when the load of the bearing is too large, the switching valve 7 can also control the refrigerant supply channel to be communicated with the first liquid taking channel and the second liquid taking channel, namely the first heat exchanger and the second heat exchanger take liquid dually; in conclusion, in the refrigerant circulation system according to the embodiment of the present invention, the switching valve 7 is disposed on the bearing cooling flow path to change the liquid taking position of the refrigerant supply flow path E, so that the liquid taking position of the refrigerant circulation system can be freely switched to meet the bearing cooling requirements under the dual working conditions of cooling and heating.
One of the first heat exchanger 1 and the second heat exchanger 4 is an evaporator, and the other is a condenser. In order to uniformly explain the working process under the dual working conditions of cooling and heating, in the following description, a liquid taking flow channel, which is communicated with the refrigerant supply flow channel E, of the first liquid taking flow channel a and the second liquid taking flow channel B is referred to as a condenser liquid taking flow channel, and the other liquid taking flow channel is referred to as an evaporator liquid taking flow channel.
In order to overcome the problem that the system pressure difference is not enough to drive the refrigerant to be taken out of the condenser when the compressor is started, the bearing cooling flow path of the embodiment further includes a first branch C and a second branch D which are arranged between the switching valve 7 and the refrigerant supply flow channel E, and a booster pump 10 is arranged on one of the first branch C and the second branch D.
Specifically, in this embodiment, the second branch D is provided with a booster pump 10.
The switching valve 7 of this embodiment is a four-way switching valve, two inlets of the four-way switching valve are respectively connected to the first liquid-taking flow channel a and the second liquid-taking flow channel B, and two outlets of the four-way switching valve are respectively connected to the first branch C and the second branch D. When the pressure is not required to be increased, the four-way switching valve can control the liquid taking flow passage of the condenser to be communicated with the first branch C. Before starting the machine, the four-way switching valve 7 controls the liquid taking channel of the condenser to be communicated with the second branch D, so that the pressure of the refrigerant is increased under the action of the booster pump 10, and liquid taking is completed.
In this embodiment, the booster pump 10 needs to be operated before the compressor 3 is operated, and the booster pump 10 is generally controlled to operate before the compressor is operated for not less than 30s so that enough refrigerant enters the bearing to lubricate and cool the bearing before the rotor of the compressor 3 is operated.
In order to effectively ensure that the bearing works stably in the operation process of the compressor 3, the working capacity of the booster pump 10 needs to be adjusted according to the working condition change or the rotating speed change of the compressor to maintain the pressure difference between the refrigerant supply flow channel E and the liquid taking position to be stable. The booster pump 10 of the present embodiment is configured as a variable frequency booster pump.
Specifically, as shown in fig. 1, the refrigerant circulation system further includes a pressure gauge 8 for measuring a pressure of the first heat exchanger 1 and a pressure gauge 2 for measuring a pressure of the second heat exchanger 4, one of the first heat exchanger 1 and the second heat exchanger 4 is an evaporator, the other is a condenser, the condenser is a liquid-taking position, the pressure of the condenser is P1, a pressure gauge 9 is disposed at a position on the refrigerant supply flow channel E near the refrigerant inlet of the bearing 19 to measure a pressure P2 of the refrigerant supply flow channel E, a pressure difference △ P-P2-P1 is set for lubrication and cooling, △ P is generally 60 to 100kpa, if the refrigerant is taken from the condenser before the unit is started, the booster pump 10 needs to be started in advance to achieve the pressure difference, after the unit is started, the system pressure difference of the liquid-taking position P1 is gradually increased, and at the same time, the flow rate of the refrigerant on the bearing cooling flow path is also gradually increased due to high-speed rotation of the compressor rotor, so that the pressure difference △ P is decreased, and the booster pump 10 needs to be automatically adjusted to increase the pressure difference △ P to maintain.
The bearing cooling flow path of the present embodiment further includes a first throttle valve 11 provided on the first branch C and the second branch D. The first throttle 11 is provided to throttle the refrigerant to lower the temperature of the refrigerant, and then to flow to the refrigerant supply flow passage E to cool the bearing 19.
The first throttle valve 11 of the present embodiment is an electrically operated valve.
In order to prevent impurities from entering the bearing 19 along with the cooling medium, the bearing cooling flow path of the present embodiment further includes a filtering device 13 disposed on the first branch C and the second branch D.
In other embodiments not shown in the drawings, a filter device may be directly disposed on the refrigerant supply channel E.
In order to further enhance the cooling effect of the cooling medium on the bearing, the bearing cooling flow path of the present embodiment further includes a supercooling heat exchanger 16, and the supercooling heat exchanger 16 is configured to cool the cooling medium in the cooling medium supply flow channel E.
Specifically, as shown in fig. 1, the bearing cooling flow path further includes a supercooling flow path F connected to the liquid taking flow path of the condenser, the supercooling flow path F is provided with a second throttle valve 12, and the supercooling flow path F and the refrigerant supply flow path E exchange heat inside the supercooling heat exchanger 16. The throttling capacity of the second throttle valve 12 is stronger than that of the first throttle valve 11, so that the refrigerant on the supercooling flow passage F is lower in temperature and lower in pressure than the refrigerant on the refrigerant supply flow passage E, and a supercooled refrigerant is obtained, and the supercooled refrigerant and the refrigerant on the refrigerant supply flow passage E exchange heat in the supercooling heat exchanger 16, so that the temperature of the refrigerant on the refrigerant supply flow passage E is further reduced, and the cooling effect on the bearing 19 is improved.
In the present embodiment, the refrigerant in the supercooling flow passage F and the refrigerant supply flow passage E flow in opposite directions in the supercooling heat exchanger 16.
As shown in fig. 1, the bearing cooling flow path of the present embodiment further includes a flow dividing valve 25, and the flow dividing valve 25 is connected to the switching valve 7 and the supercooling flow path F to divide the refrigerant on the liquid taking flow path of the partial condenser to the supercooling flow path F.
Specifically, the flow dividing valve 25 is a three-way valve. When the first liquid taking flow passage a is used as a condenser liquid taking flow passage, the flow dividing valve 25 connects a part of the refrigerant on the first liquid taking flow passage a to the switching valve 7 to flow to the refrigerant supply flow passage E, and connects a part of the refrigerant on the first liquid taking flow passage a to the supercooling flow passage F.
Part of the refrigerant absorbs heat and turns into gaseous refrigerant in the process that the refrigerant enters the bearing 19 to cool the bearing. The gaseous refrigerant remaining inside the bearing 19 causes internal gas accumulation, which has poor secondary heat exchange effect and occupies heat exchange area, thereby reducing the cooling effect of the bearing. Moreover, the excessive air accumulation may increase the pressure inside the bearing 19, so that the liquid refrigerant is difficult to enter the bearing 19, and the refrigerant supply amount of the bearing is reduced. In order to improve the above problem of air accumulation, the bearing cooling flow path of the present embodiment further includes a balance flow path G. The balance flow path G is used to flow the gaseous refrigerant in the bearing 19 to the evaporator or the suction port of the compressor 3. The pressure of the evaporator is far lower than the pressure inside the bearing, so that the effect of quickly guiding away the accumulated air is achieved.
The balance flow path G of the present embodiment may be provided on and off. Specifically, the balance flow path G of the present embodiment is provided with an on-off control valve 14 to control on-off of the balance flow path G.
As shown in fig. 1, the bearing cooling flow path of the present embodiment further includes a flash tank 26, and the flash tank 26 is in fluid communication with the bearing 19 to separate the refrigerant after cooling the bearing 19 into gas and liquid. The bearing cooling flow path also includes a make-up air flow passage H and a throttle device 28 disposed between the flash tank 26 and the evaporator. The refrigerant that has cooled the bearing 19 enters the flash tank 26 to be subjected to gas-liquid separation, and the liquid refrigerant is throttled again by the throttle device 28 and flows to the evaporator. The gaseous refrigerant flows to the charge port 31 of the compressor 3 through the charge flow passage H.
Since the bearing 19 of the present embodiment is located at a high position in space, in order to prevent the refrigerant in the bearing cooling flow path from flowing backward in the shutdown state, the bearing cooling flow path of the present embodiment further includes a check valve 17 disposed between the refrigerant supply flow passage E and the bearing 19.
As shown in fig. 1, the refrigerant circulation system of this embodiment further includes a first liquid level sensor 5 for detecting a liquid level of the refrigerant in the first heat exchanger 1 and a second liquid level sensor 6 for detecting a liquid level of the refrigerant in the second heat exchanger 4, the switching valve 7 is coupled to the first liquid level sensor 5 and the second liquid level sensor 6, and when the main circulation flow path is in a cooling state, the switching valve 7 controls the refrigerant supply flow path E to communicate with the first liquid taking flow path a or the second liquid taking flow path B according to the liquid levels detected by the first liquid level sensor 5 and the second liquid level sensor 6.
The present embodiment switches and controls the liquid-taking position by providing the switching valve 7, the flow dividing valve 25, the first liquid level sensor 5, and the second liquid level sensor 6.
Specifically, before starting up, the switching valve 7 and the flow dividing valve 25 are adjusted to enable the liquid taking flow channel to flow to the second branch circuit D so as to improve the pressure of the refrigerant, and at the moment, the liquid taking flow channel of the evaporator and the first branch circuit C are closed;
when the load of the bearing is too large, the liquid is not supplied by only taking liquid from the condenser, and the liquid can be taken from the evaporator and the condenser through the switching valve 7;
when the main circulation flow path is in a heating state, liquid is taken from the condenser through the adjusting switching valve 7;
when the main circulation flow path is in a refrigeration state, liquid is taken from the condenser and the evaporator to cool the bearing, the liquid taking position is controlled by the refrigerant liquid level measured by the first liquid level sensor 5 and the second liquid level sensor 6, and the liquid taking position with high liquid level is used as the liquid taking position. If the liquid is taken from the condenser originally, when the liquid level of the refrigerant of the evaporator is higher than that of the refrigerant of the condenser, the four-way switching valve and the switching valve are controlled to close the liquid taking flow channel of the condenser, and the liquid taking flow channel of the evaporator is communicated to take the liquid from the evaporator.
The compressor of the present embodiment is a centrifugal compressor.
The present embodiment further provides a refrigeration apparatus, including the refrigerant circulation system of the above embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (18)
1. A refrigerant circulation system, comprising:
the main circulation flow path comprises a compressor (3), a first heat exchanger (1), a four-way valve and a second heat exchanger (4) which are arranged in sequence; and
the bearing cooling flow path comprises a first liquid taking flow channel (A) connected with the first heat exchanger (1), a second liquid taking flow channel (B) connected with the second heat exchanger (4), a refrigerant supply flow channel (E) for supplying a refrigerant to a bearing (19) of the compressor (3) and a switching valve (7), wherein the switching valve (7) controls the refrigerant supply flow channel (E) to be selectively communicated with at least one of the first liquid taking flow channel (A) and the second liquid taking flow channel (B).
2. The coolant circulation system according to claim 1, wherein the bearing cooling flow path further includes a first branch (C) and a second branch (D) provided between the switching valve (7) and the coolant supply flow path (E), and a booster pump (10) is provided in one of the first branch (C) and the second branch (D).
3. Refrigerant circulation system according to claim 2, characterized in that the booster pump (10) is a variable frequency booster pump.
4. The coolant circulation system according to claim 2, wherein the bearing cooling flow path further includes a first throttle (11) provided in the first branch (C) and the second branch (D).
5. The coolant circulation system according to claim 2, wherein the bearing cooling flow path further comprises a filter device (13) disposed on the first branch (C) and the second branch (D).
6. The coolant circulation system according to claim 2, wherein the switching valve (7) comprises a four-way switching valve, two inlets of the four-way switching valve are respectively connected to the first liquid taking flow passage (a) and the second liquid taking flow passage (B), and two outlets of the four-way switching valve are respectively connected to the first branch (C) and the second branch (D).
7. The coolant circulation system according to any one of claims 1 to 6, wherein the bearing cooling flow path further includes a supercooling heat exchanger (16), and the supercooling heat exchanger (16) is configured to cool the coolant of the coolant supply flow channel (E).
8. The refrigerant circulation system according to claim 7, wherein a liquid taking flow passage of the first liquid taking flow passage (a) and the second liquid taking flow passage (B) communicating with the refrigerant supply flow passage (E) is a condenser liquid taking flow passage, the bearing cooling flow path further includes a supercooling flow passage (F) communicating with the condenser liquid taking flow passage, a second throttle valve (12) is disposed on the supercooling flow passage (F), and the supercooling flow passage (F) and the refrigerant supply flow passage (E) exchange heat inside the supercooling heat exchanger (16).
9. The refrigerant circulation system according to claim 8, wherein the refrigerant flowing in the supercooling flow passage (F) and the refrigerant supplying flow passage (E) are opposite to each other in the inside of the supercooling heat exchanger (16).
10. The coolant circulation system according to claim 8, wherein the bearing cooling flow path further includes a bypass valve (25), and the bypass valve (25) is connected to the switching valve (7) and the subcooling flow path (F) to bypass a portion of the coolant in the condenser liquid-taking flow path to the subcooling flow path (F).
11. The coolant circulation system according to any one of claims 1 to 6, wherein the bearing cooling flow path further includes a check valve (17) disposed between the coolant supply flow passage (E) and the bearing (19), the check valve (17) preventing the coolant in the bearing (19) from flowing to the coolant supply flow passage (E).
12. The coolant circulation system according to any one of claims 1 to 6, wherein one of the first heat exchanger (1) and the second heat exchanger (4) is an evaporator and the other is a condenser, and the bearing cooling flow path further includes a balance flow passage (G) for circulating the gaseous coolant in the bearing (19) to the evaporator or a suction port of the compressor (3).
13. The coolant circulation system according to claim 12, wherein the balance flow path (G) is provided so as to be opened and closed.
14. The coolant circulation system according to any one of claims 1 to 6, wherein the bearing cooling flow path further includes a flash tank (26), the flash tank (26) being in fluid communication with the bearing (19) to separate the coolant after cooling the bearing (19) into gas and liquid.
15. The refrigerant circulation system according to claim 14, wherein one of the first heat exchanger (1) and the second heat exchanger (4) is an evaporator, and the other is a condenser, and the bearing cooling flow path further includes a gas supplementing flow passage (H) and a throttling device (28) disposed between the flash tank (26) and the evaporator.
16. The refrigerant cycle system according to any one of claims 1 to 6, further comprising a first liquid level sensor (5) for detecting a liquid level of the refrigerant in the first heat exchanger (1) and a second liquid level sensor (6) for detecting a liquid level of the refrigerant in the second heat exchanger (4), wherein the switching valve (7) is coupled to the first liquid level sensor (5) and the second liquid level sensor (6), and when the main cycle flow path is in a refrigeration state, the switching valve (7) controls the refrigerant supply flow path (E) to communicate with the first liquid taking flow path (A) or the second liquid taking flow path (B) according to liquid levels detected by the first liquid level sensor (5) and the second liquid level sensor (6).
17. The refrigerant circulation system according to any one of claims 1 to 6, wherein the compressor is a centrifugal compressor.
18. A refrigeration apparatus comprising a refrigerant circulation system as claimed in any one of claims 1 to 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599012.5A CN111365910A (en) | 2018-12-26 | 2018-12-26 | Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811599012.5A CN111365910A (en) | 2018-12-26 | 2018-12-26 | Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111365910A true CN111365910A (en) | 2020-07-03 |
Family
ID=71209839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811599012.5A Pending CN111365910A (en) | 2018-12-26 | 2018-12-26 | Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111365910A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023088043A1 (en) * | 2021-11-22 | 2023-05-25 | 青岛海尔空调电子有限公司 | Compressor liquid supply system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015142825A1 (en) * | 2014-03-18 | 2015-09-24 | Carrier Corporation | Refrigerant lube system |
| CN106091188A (en) * | 2016-06-12 | 2016-11-09 | 重庆美的通用制冷设备有限公司 | Refrigeration unit |
| CN106642778A (en) * | 2016-11-14 | 2017-05-10 | 重庆美的通用制冷设备有限公司 | Oilless water chilling unit and air conditioning system |
| US20170146271A1 (en) * | 2014-07-31 | 2017-05-25 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Turbo chiller |
| CN209214165U (en) * | 2018-12-26 | 2019-08-06 | 珠海格力电器股份有限公司 | Liquid level is taken to set changeable coolant circulating system and refrigeration equipment |
-
2018
- 2018-12-26 CN CN201811599012.5A patent/CN111365910A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015142825A1 (en) * | 2014-03-18 | 2015-09-24 | Carrier Corporation | Refrigerant lube system |
| US20170146271A1 (en) * | 2014-07-31 | 2017-05-25 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Turbo chiller |
| CN106091188A (en) * | 2016-06-12 | 2016-11-09 | 重庆美的通用制冷设备有限公司 | Refrigeration unit |
| CN106642778A (en) * | 2016-11-14 | 2017-05-10 | 重庆美的通用制冷设备有限公司 | Oilless water chilling unit and air conditioning system |
| CN209214165U (en) * | 2018-12-26 | 2019-08-06 | 珠海格力电器股份有限公司 | Liquid level is taken to set changeable coolant circulating system and refrigeration equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023088043A1 (en) * | 2021-11-22 | 2023-05-25 | 青岛海尔空调电子有限公司 | Compressor liquid supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10480831B2 (en) | Compressor bearing cooling | |
| CN205505260U (en) | A air conditioning equipment for computer lab | |
| AU2007241898B2 (en) | Refrigeration system | |
| WO2016201623A1 (en) | Refrigeration cycle device | |
| JP7330367B2 (en) | Heat source unit, refrigeration cycle device and refrigerator | |
| CN107024015A (en) | A kind of refrigerating method of refrigeration system, refrigerator and refrigerator | |
| JP2008014577A (en) | Bearing lubricating device for compression type refrigerating machine | |
| JP6727420B2 (en) | Air conditioner | |
| CN111365910A (en) | Refrigerant circulation system with switchable liquid taking positions and refrigeration equipment | |
| CN106461281A (en) | Chiller system | |
| CN105841374A (en) | Cooling system | |
| CN209214165U (en) | Liquid level is taken to set changeable coolant circulating system and refrigeration equipment | |
| CN111365874A (en) | Refrigerant circulating system | |
| JP4313083B2 (en) | Screw refrigeration equipment | |
| CN103079854A (en) | Updating method for vehicle air conditioning device and vehicle air conditioning device | |
| CN104422198B (en) | The control method of compressor and its oil pump | |
| CN212657900U (en) | Refrigerant circulation system and air conditioning unit | |
| CN206449925U (en) | A kind of High-precision temperature control type heat exchange system | |
| CN108603697A (en) | Refrigerating plant | |
| WO2015094465A1 (en) | Method of improving compressor bearing reliability | |
| US11892216B2 (en) | Refrigeration system with direct expansion refrigeration mode and refrigerant pumping energy-efficiency mode and control method of refrigeration system | |
| CN207600009U (en) | A kind of folding type cooling system of freezer with hot gas defrosting | |
| CN114198922B (en) | Liquid supply system of compressor | |
| CN105627613A (en) | Outdoor unit for air conditioner and air conditioner | |
| JPS6155562A (en) | Refrigerator using mixed refrigerant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |