CN107196462B - Centrifugal water chilling unit, central air conditioner and condensation prevention method - Google Patents
Centrifugal water chilling unit, central air conditioner and condensation prevention method Download PDFInfo
- Publication number
- CN107196462B CN107196462B CN201710580088.2A CN201710580088A CN107196462B CN 107196462 B CN107196462 B CN 107196462B CN 201710580088 A CN201710580088 A CN 201710580088A CN 107196462 B CN107196462 B CN 107196462B
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- China
- Prior art keywords
- pressure
- regulating valve
- pressure regulating
- evaporator
- shell
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Links
- 238000009833 condensation Methods 0.000 title claims abstract description 23
- 230000005494 condensation Effects 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002265 prevention Effects 0.000 title abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims abstract description 68
- 239000007788 liquid Substances 0.000 abstract description 12
- 238000001704 evaporation Methods 0.000 abstract description 10
- 230000008020 evaporation Effects 0.000 abstract description 7
- 238000005507 spraying Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 9
- 239000007921 spray Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000011555 saturated liquid Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a centrifugal water chilling unit, a central air conditioner and a condensation prevention method, and relates to the field of air conditioners. The centrifugal water chilling unit comprises a motor, an evaporator and a pressure regulating valve; a pressure regulating valve is arranged between the outlet of the shell of the motor and the inlet of the evaporator. Wherein when the pressure in the housing is greater than the pressure in the evaporator, the pressure regulating valve turns on the outlet and the inlet; the pressure regulating valve disconnects the outlet from the inlet when the pressure within the housing is less than or equal to the pressure within the evaporator. According to the technical scheme provided by the embodiment of the invention, when the evaporation pressure of the liquid spraying in the shell of the motor rises to the set value, the pressure regulating valve can be opened, so that the possibility of condensation can be reduced.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a centrifugal water chilling unit, a central air conditioner and an anti-condensation method.
Background
The large central air conditioner water chiller mainly adopts a centrifugal chiller, and the centrifugal chiller mainly comprises a centrifugal compressor, a main motor, a condenser (water-cooled shell tube), an evaporator (full-liquid horizontal shell tube), a throttling device, a compressor inlet energy regulating mechanism, a lubricating oil system, a main motor spray liquid evaporative cooling system and the like.
The inventors found that at least the following problems exist in the prior art: for a unit adopting a spray evaporation cooling mode for a main motor, the temperature of the outer surface of the motor is often lower than the ambient temperature due to lower spray evaporation temperature, vapor entrained in air can condense on the surface of the motor in a low-temperature state, so that the motor is seriously condensed, the electric connection short circuit and other faults of the motor are directly caused by the condensed liquid, and the motor is damaged.
Disclosure of Invention
One of the purposes of the invention is to provide a centrifugal water chilling unit, a central air conditioner and a condensation prevention method, which are used for reducing the probability of condensation of a motor of the centrifugal water chilling unit.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a centrifugal water chilling unit, which comprises a motor, an evaporator and a pressure regulating valve; a pressure regulating valve is arranged between the shell outlet of the motor and the inlet of the evaporator;
wherein when the pressure in the housing is greater than the pressure in the evaporator, the pressure regulating valve turns on the outlet and the inlet; the pressure regulating valve disconnects the outlet from the inlet when the pressure within the housing is less than or equal to the pressure within the evaporator.
In an alternative embodiment, the pressure regulating valve is configured to open when the pressure within the housing is greater than the pressure within the evaporator such that no condensation occurs within the housing.
In an alternative embodiment, the pressure regulating valve is provided on the muffler between the outlet of the housing and the inlet of the evaporator.
In an alternative embodiment, the opening pressure of the pressure regulating valve can be continuously regulated.
In an alternative embodiment, the opening pressure of the pressure regulating valve can be regulated stepwise.
In an alternative embodiment, the centrifugal chiller further comprises a controller coupled to the pressure regulating valve, the controller configured to open the pressure regulating valve when the pressure within the housing is greater than a threshold value.
In an alternative embodiment, the pressure regulating valve comprises a solenoid valve, and the controller is electrically connected to the pressure regulating valve.
Another embodiment of the invention provides a central air conditioner, which comprises the centrifugal water chilling unit provided by any one of the technical schemes of the invention.
The invention also provides a condensation preventing method for the centrifugal compressor of the centrifugal water chilling unit, which comprises the following steps:
detecting the pressure in the motor shell of the centrifugal water chilling unit;
and when the pressure in the shell is larger than the pressure in the evaporator, opening a pressure regulating valve between the outlet of the shell and the inlet of the evaporator so as to conduct the outlet and the inlet.
In an alternative embodiment, the pressure regulating valve is opened when the pressure in the housing is greater than the pressure in the evaporator such that no condensation occurs in the housing.
Based on the technical scheme, the embodiment of the invention at least has the following technical effects:
according to the technical scheme provided by the embodiment of the invention, a pressure regulating valve is added between a shell outlet of the motor (namely a motor cooling return air port) and an outlet of the evaporator, and the pressure regulating valve has the following functions: by adjusting the opening set point of the pressure regulating valve, the pressure regulating valve is opened when the inlet pressure of the valve rises, such as when the spray evaporation pressure in the shell of the motor rises to the set point. Therefore, the evaporating pressure of the motor spray liquid is higher than the pressure in the evaporator, and the pressure and the temperature in the two-phase region have a corresponding relation, so that the evaporating temperature value of the motor spray liquid is improved, the temperature of the surface of the motor is not cooled too low, and the possibility of condensation is reduced.
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 embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic diagram of a centrifugal chiller according to an embodiment of the present invention.
Reference numerals:
1. a motor; 2. an evaporator; 3. a pressure regulating valve; 4. a compressor; 5. a condenser; 6. a throttle valve; 7. a cooling throttle valve; 8. a filter; 9. an air return pipe; 11. a housing; 12. an outlet; 21. an inlet; 41. inlet guide vanes; 42. an impeller.
Detailed Description
The technical scheme provided by the invention is described in more detail below with reference to fig. 1.
Referring to fig. 1, an embodiment of the present invention provides a centrifugal chiller, which includes a motor 1, an evaporator 2, and a pressure regulating valve 3. A pressure regulating valve 3 is provided between the outlet of the housing 11 of the motor 1 and the inlet of the evaporator 2. Wherein the pressure regulating valve 3 conducts the outlet 12 of the housing 11 with the inlet 21 of the evaporator 2 when the pressure in the housing 11 is greater than the pressure in the evaporator 2. When the pressure in the housing 11 is less than or equal to the pressure in the evaporator 2, the pressure regulating valve 3 disconnects the housing 11 outlet from the evaporator 2 inlet 21.
The pressure regulating valve 3 is a valve with adjustable self-opening pressure, and one structural form is that the opening pressure can be adjusted in the working process, for example, the valve is opened according to the needed pressure value by a controller; another way is to adjust its pressure before operation, after installation into the system, its opening pressure is determined. The former is more flexible to adjust, and the latter is simpler to control.
Further, the pressure regulating valve 3 is configured to be opened when the pressure in the housing 11 is greater than the pressure in the evaporator 2 so that the condensation phenomenon does not occur in the housing 11. The opening pressure of the pressure regulating valve 3 may be set as desired, for example, to be 50pa greater than the pressure in the evaporator 2.
Further referring to fig. 1, an air return pipe 9 is provided between the outlet 12 of the housing 11 and the inlet 21 of the evaporator 2, and the pressure regulating valve 3 is provided on the air return pipe 9 between the outlet of the housing 11 and the inlet of the evaporator 2. The pressure regulating valve 3 is opened, and then the return air pipe 9 is conducted; the pressure regulating valve 3 is closed and the return air pipe 9 is disconnected.
Alternatively, the opening pressure of the pressure regulating valve 3 can be continuously regulated, so that the control is more accurate.
Alternatively, the opening pressure of the pressure regulating valve 3 can be stepwise regulated. For example, the pressure regulating valve 3 is opened only when the pressure reaches a set threshold value.
Optionally, the centrifugal chiller further comprises a controller connected to the pressure regulating valve 3, the controller being configured to open the pressure regulating valve when the pressure within the housing 11 is greater than a threshold value. The pressure regulating valve 3 can be conveniently opened or closed through the controller, so that the automation control degree of the centrifugal water chilling unit is improved.
Alternatively, the pressure regulating valve 3 includes a solenoid valve, and the controller is electrically connected to the pressure regulating valve 3. The controller can adopt a PLC controller, and the electromagnetic valve is convenient to control.
The centrifugal chiller will be described in detail with reference to fig. 1.
Referring to fig. 1, the centrifugal chiller is a refrigeration system with a motor spray evaporative cooling system, which includes a compressor 4, a motor 1, a condenser 5, a throttle valve 6, an evaporator 2, a filter 8, a motor cooling throttle valve 7, and a pressure regulating valve 3. The motor 1 is used to drive the impeller 42 of the compressor 4, the side of the windings of the motor 1 and the side of the inlet guide vanes 41 of the compressor 4 being air-tightly separated from each other. The compressor 4, the condenser 5, the throttle valve 6 and the evaporator 2 are connected in sequence.
The circulation working principle of the refrigeration system is as follows: the high-temperature high-pressure gas discharged by the compressor 4 reaches the condenser 5 through the exhaust pipe, is condensed into low-temperature high-pressure liquid at the bottom of the condenser 5, and is throttled into low-pressure low-temperature two-phase gas-liquid through the throttle valve 6; then enters the evaporator 2 for evaporation, and the low-pressure gas returns to the compressor 4.
The working principle of the liquid spraying evaporative cooling system of the main motor is as follows: the low-temperature high-pressure refrigerant liquid at the bottom of the condenser 5 is filtered by a filter 8, throttled into low-temperature low-pressure saturated liquid by a cooling throttle valve 7 of the motor 1, sprayed onto a winding of the main motor 1, evaporated and absorbed heat in a shell 11 to take away heat, and evaporated gas enters the evaporator 2 to enable the motor 1 to achieve the effect of cooling. There is a correspondence between the temperature and pressure of the saturated liquid.
The motor spray liquid return pipe 9 is directly communicated with the evaporator 2, the spray liquid evaporation pressure in the shell 11 of the motor 1 is equal to the pressure in the evaporator 2, and the evaporation temperature in the flooded evaporator is generally 5 ℃; if the pressure regulating valve 3 is not provided, the evaporating temperature in the shell of the motor 1 is 5 ℃, and condensation is generated when the temperature is low. After the pressure regulating valve 3 is provided in the embodiment of the present invention, the housing 11 of the motor 1 can be separated from the housing of the evaporator 2 so that the pressures thereof are different. In order to reduce the occurrence probability of the condensation phenomenon, or even prevent the occurrence of the condensation phenomenon, the opening pressure of the pressure regulating valve 3 may be set sufficiently high.
Another embodiment of the invention provides a central air conditioner, which comprises the centrifugal water chilling unit provided by any one of the technical schemes of the invention.
The central air conditioner comprises a water system, a wind system and the water chilling unit, wherein the water chilling unit is used for generating a cold source.
The invention also provides a condensation preventing method for the centrifugal compressor of the centrifugal water chilling unit, which can be realized by adopting the centrifugal water chilling unit provided by any one of the embodiments. The method comprises the following steps:
step one, the pressure in the shell 11 of the centrifugal chiller motor 1 is detected to judge whether the pressure regulating valve 3 needs to be opened.
And step two, when the pressure in the shell 11 is greater than the pressure in the evaporator 2, opening a pressure regulating valve between the outlet 12 of the shell 11 and the inlet 21 of the evaporator 2 to conduct the outlet 12 of the shell 11 and the inlet 21 of the evaporator 2.
To prevent the occurrence of the condensation phenomenon, the pressure regulating valve 3 is opened when the pressure in the housing 11 is greater than the pressure in the evaporator 2 so that the condensation phenomenon is not generated in the housing 11.
For a set unit, the dew point temperature is determined, and the corresponding pressure is also known, so that the determined opening temperature of the pressure regulating valve can be set for the determined unit.
According to the technical scheme, the probability of condensation of the motor of the centrifugal compressor can be reduced, even the occurrence of the condensation of the motor of the centrifugal compressor can be prevented, the safety of the main motor is ensured, and the running reliability of the unit is improved.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The centrifugal water chilling unit is characterized by comprising a motor (1), an evaporator (2), a pressure regulating valve (3) and a controller; a pressure regulating valve (3) is arranged between an outlet (12) of a shell (11) of the motor (1) and an inlet (21) of the evaporator (2);
wherein the controller is connected with the pressure regulating valve (3), and when the pressure in the shell (11) is larger than the pressure in the evaporator (2), the controller opens the pressure regulating valve (3) to conduct the outlet (12) and the inlet (21); when the pressure in the shell (11) is less than or equal to the pressure in the evaporator (2), the controller closes the pressure regulating valve (3) to disconnect the outlet (12) from the inlet (21) so that no condensation phenomenon occurs in the shell (11);
the pressure regulating valve (3) is arranged on the air return pipe (9) between the outlet (12) of the shell (11) and the inlet (21) of the evaporator (2);
the opening pressure of the pressure regulating valve (3) can be continuously regulated.
2. Centrifugal chiller according to claim 1 wherein the opening pressure of the pressure regulating valve (3) is stepwise adjustable.
3. The centrifugal chiller according to claim 1 wherein the pressure regulating valve (3) comprises a solenoid valve and the controller is electrically connected to the pressure regulating valve (3).
4. A central air conditioner, characterized by comprising the centrifugal chiller set according to any one of claims 1-3.
5. A method for preventing condensation of a centrifugal compressor of a centrifugal chiller, wherein the centrifugal chiller is a centrifugal chiller according to any one of claims 1-3, the method comprising the steps of:
detecting the pressure in the motor shell of the centrifugal water chilling unit;
and when the pressure in the shell is larger than the pressure in the evaporator, opening a pressure regulating valve between the outlet of the shell and the inlet of the evaporator so as to conduct the outlet and the inlet.
6. The method of claim 5, wherein the pressure regulating valve is opened when the pressure in the casing is greater than the pressure in the evaporator so that no condensation occurs in the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580088.2A CN107196462B (en) | 2017-07-17 | 2017-07-17 | Centrifugal water chilling unit, central air conditioner and condensation prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710580088.2A CN107196462B (en) | 2017-07-17 | 2017-07-17 | Centrifugal water chilling unit, central air conditioner and condensation prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107196462A CN107196462A (en) | 2017-09-22 |
| CN107196462B true CN107196462B (en) | 2024-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710580088.2A Active CN107196462B (en) | 2017-07-17 | 2017-07-17 | Centrifugal water chilling unit, central air conditioner and condensation prevention method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11817761B2 (en) * | 2021-11-05 | 2023-11-14 | Hamilton Sundstrand Corporation | Aircraft electric motor |
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2017
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|---|---|---|---|---|
| US3112618A (en) * | 1960-06-15 | 1963-12-03 | American Radiator & Standard | Cooling means for refrigerant compressor motors |
| JPH0363461A (en) * | 1989-07-31 | 1991-03-19 | Hitachi Ltd | Overheat protecting method for set capacity type compressor |
| JPH10292948A (en) * | 1997-04-17 | 1998-11-04 | Mitsubishi Heavy Ind Ltd | Refrigerator |
| JP2002005024A (en) * | 2000-04-19 | 2002-01-09 | Denso Corp | Electric compressor integrated with motor driving circuit |
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| Publication number | Publication date |
|---|---|
| CN107196462A (en) | 2017-09-22 |
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