CN215638105U - Oil temperature control system and centrifugal water chilling unit - Google Patents
Oil temperature control system and centrifugal water chilling unit Download PDFInfo
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- CN215638105U CN215638105U CN202121668285.8U CN202121668285U CN215638105U CN 215638105 U CN215638105 U CN 215638105U CN 202121668285 U CN202121668285 U CN 202121668285U CN 215638105 U CN215638105 U CN 215638105U
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Abstract
The utility model provides an oil temperature control system and a centrifugal water chilling unit. The oil temperature control system is applied to a centrifugal water chilling unit. The centrifugal water chilling unit comprises a lubricating oil system connected through an oil pipeline, wherein the lubricating oil system comprises a centrifugal compressor, an oil separator, an oil tank, an oil pump and an oil-cooled plate type heat exchanger. The oil temperature control system comprises a refrigeration system connected through a first refrigerant pipeline and a controller used for controlling the refrigeration system, wherein the refrigeration system comprises a compressor, a condenser, a heating coil, an expansion valve and an oil-cooled plate type heat exchanger, the heating coil, the expansion valve and the oil-cooled plate type heat exchanger are arranged in an oil tank and used for heating the oil temperature in the oil tank, the condenser is connected with an outlet of the compressor, one end of the heating coil is connected to the condenser, the other end of the heating coil is connected to the oil-cooled plate type heat exchanger through the expansion valve, and the oil-cooled plate type heat exchanger is connected to an inlet of the compressor. The utility model can accurately control the temperature of the oil supplied by the oil tank and the compressor, thereby controlling the viscosity of the lubricating oil.
Description
Technical Field
The utility model relates to the technical field of refrigeration equipment, in particular to an oil temperature control system and a centrifugal water chilling unit.
Background
The lubricating oil system is a key subsystem of the centrifugal water chilling unit and provides guarantee for the reliable operation of the compressor. Fig. 1 discloses a schematic block diagram of a lubrication oil system 100 in a centrifugal chiller. As shown in fig. 1, the lubricating oil discharged from the bearings of the compressor 101 enters the oil separator 102, and then enters the oil tank 103 from the oil separator 102, and the lubricating oil in the oil tank 103 is pumped out by an oil pump (not shown), passes through an oil cooling coil 112 placed in the economizer 104, and then flows back to the compressor 101, thereby completing lubrication. Temperature and pressure sensors are typically provided in the oil tank 103, while an electric heater 111 is provided in the oil tank 103 for heating the oil.
Oil temperature control is critical to ensure that a suitable oil viscosity is provided. However, in actual operation, oil temperature control is difficult. The oil temperature is different because the working conditions and the load of the compressor 101 are different in different application occasions. It is currently difficult to ensure optimal oil viscosity and control the refrigerant content in the oil by means of only the electric heater 111 in the oil tank 103 and the oil cooling coil 112 in the economizer 104.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an oil temperature control system and a centrifugal water chilling unit, which can accurately control the temperature of oil supplied in an oil tank and a compressor so as to control the viscosity of lubricating oil.
One aspect of the present invention provides an oil temperature control system for use in a centrifugal chiller. The centrifugal water chilling unit comprises a lubricating oil system connected through an oil pipeline, and the lubricating oil system comprises a centrifugal compressor, an oil separator, an oil tank, an oil pump and an oil-cooled plate type heat exchanger. Oil temperature control system includes the refrigerating system who connects through first refrigerant pipe way and is used for right refrigerating system carries out the controller controlled, refrigerating system includes compressor, condenser, places in be used for the heating in the oil tank heating coil, expansion valve of the oil temperature in the oil tank with oil-cooled plate heat exchanger, wherein, the condenser with the exit linkage of compressor, heating coil's one end is connected to the condenser, heating coil's the other end passes through the expansion valve is connected to oil-cooled plate heat exchanger, oil-cooled plate heat exchanger is connected to the entry of compressor.
Further, the oil temperature control system further comprises a first oil temperature sensor arranged in the oil tank and used for detecting the oil temperature in the oil tank, and the first oil temperature sensor is connected with the controller.
Further, the oil temperature control system further comprises an auxiliary electric heating device arranged in the oil tank, the auxiliary electric heating device is connected with the controller, and when the oil temperature in the oil tank detected by the first oil temperature sensor is lower than a preset oil temperature threshold value, the controller controls the auxiliary electric heating device to heat the oil temperature in the oil tank.
Further, the condenser comprises an air-cooled condenser.
Further, the air-cooled condenser is connected with the controller, wherein when the oil temperature in the oil tank detected by the first oil temperature sensor is higher than a predetermined oil temperature threshold value, the controller controls the air-cooled condenser to dissipate a part of heat.
Further, the oil temperature control system further comprises a second oil temperature sensor which is arranged in an oil pipeline at the outlet of the oil-cooled plate type heat exchanger and used for detecting the oil temperature at the outlet of the oil-cooled plate type heat exchanger, and the second oil temperature sensor is connected with the controller.
Further, the controller controls and adjusts the load of the compressor to control the oil temperature at the outlet of the oil-cooled plate heat exchanger based on the oil temperature at the outlet of the oil-cooled plate heat exchanger detected by the second oil temperature sensor.
Further, the expansion valve is a constant pressure expansion valve.
Further, the centrifugal chiller further comprises an air extraction device, wherein the air extraction device comprises an air extraction tank, the constant-pressure expansion valve is connected in parallel to the air extraction tank through a second refrigerant pipeline, and the air extraction tank is connected to an inlet of the compressor.
Another aspect of the utility model also provides a centrifugal chiller. The centrifugal water chilling unit comprises the oil temperature control system.
The oil temperature control system and the centrifugal water chilling unit with the same provided by one or more embodiments of the utility model can accurately control the temperature of oil supplied in the oil tank and the compressor, so as to control the viscosity of lubricating oil, and further guarantee the reliable operation of the centrifugal compressor.
Drawings
FIG. 1 is a schematic block diagram of a lubrication oil system in a centrifugal chiller;
fig. 2 is a schematic block diagram of an oil temperature control system applied to a centrifugal chiller according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the utility model, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
An embodiment of the present invention provides an oil temperature control system 200. The oil temperature control system 200 of one embodiment of the present invention may be applied to a centrifugal chiller. Fig. 2 discloses a schematic block diagram of an oil temperature control system 200 applied to a centrifugal chiller according to an embodiment of the present invention. As shown in fig. 2, the centrifugal chiller of one embodiment of the present invention includes a lubricating oil system connected by an oil line 241. The lubricating oil system comprises a centrifugal compressor 201, an oil separator 202, an oil tank 203, an oil pump 204 and an oil-cooled plate heat exchanger 205. Wherein, the oil separator 202 is connected with the outlet of the centrifugal compressor 201, the oil tank 203 is connected with the oil separator 202, and the oil tank 203 is connected to the oil-cooled plate heat exchanger 205 through the oil pump 204, and the oil-cooled plate heat exchanger 205 is connected to the inlet of the centrifugal compressor 201, thereby forming the lubricating oil system of the centrifugal water chilling unit.
Continuing to refer to fig. 2, the oil temperature control system 200 according to an embodiment of the present invention includes a refrigeration system connected by a first refrigerant line 251 and a controller (not shown) for controlling the refrigeration system. The refrigeration system includes a compressor 211, a condenser 212, a heating coil 213 built in the oil tank 203 for heating the oil temperature in the oil tank 203, an expansion valve 214, and an oil-cooled plate heat exchanger 205. Wherein the condenser 212 is connected to an outlet of the compressor 211, one end of the heating coil 213 is connected to the condenser 212, the other end of the heating coil 213 is connected to the oil-cooled plate heat exchanger 205 through an expansion valve 214, and the oil-cooled plate heat exchanger 205 is connected to an inlet of the compressor 211.
In one embodiment, the oil temperature control system 200 of the present invention may further include a first oil temperature sensor 221. The first oil temperature sensor 221 is disposed in the oil tank 203 and may be used to detect the temperature of oil in the oil tank 203. The first oil temperature sensor 221 may be connected to the controller, and the first oil temperature sensor 221 may transmit the detected oil temperature in the oil tank 203 to the controller.
In one embodiment, the oil temperature control system 200 of the present invention may further include an auxiliary electric heating device 231. The auxiliary electric heating device 231 is disposed in the oil tank 203, and may be used to perform auxiliary heating on the oil in the oil tank 203. The auxiliary electric heating device 231 is connected to a controller, and the controller can control the auxiliary electric heating device 231 accordingly.
The heat in the heating coil 213 built into the oil tank 203 can be used to heat the oil in the oil tank 203 to volatilize the refrigerant in the oil to control the refrigerant content in the oil. The vaporized refrigerant is returned to the evaporator 131 through the oil separator 202. In some embodiments, when the oil temperature in the oil tank 203 detected by the first oil temperature sensor 221 is lower than the predetermined oil temperature threshold, which indicates that the heat in the heating coil 213 disposed in the oil tank 203 is not enough to heat the oil in the oil tank 203 to the predetermined oil temperature threshold, the controller may control the auxiliary electric heating device 231 to be turned on, so that the lubricating oil in the oil tank 203 is heated by the auxiliary electric heating device 231, so as to heat the oil in the oil tank 203 to the predetermined oil temperature threshold.
In one embodiment, the condenser 212 of the present invention may include, for example, but is not limited to, an air cooled condenser 212. The use of the air-cooled condenser 212 makes the operation more convenient. The air-cooled condenser 212 is connected to a controller, and the controller can control the air-cooled condenser 212 accordingly.
In some embodiments, when the oil temperature in the oil tank 203 detected by the first oil temperature sensor 221 is higher than the predetermined oil temperature threshold, which indicates that the amount of heat in the heating coil 213 built in the oil tank 203 is excessive, the controller may control the fan in the air-cooled condenser 212 to dissipate a portion of the heat so as to maintain the oil in the oil tank 203 at the predetermined oil temperature threshold.
The oil temperature control system 200 of the present invention can control the refrigerant content in the lubricating oil by controlling the oil in the oil tank 203 at a predetermined oil temperature threshold.
The lubricating oil is heated by a heating coil 213 built in the oil tank 203 and then pumped out from the oil pump 204, and the high-temperature lubricating oil enters the oil-cooled plate heat exchanger 205 to be cooled before entering the inlet of the centrifugal compressor 201. The heating coil 213 heats the lubricant oil in the oil tank 203 to volatilize the refrigerant in the lubricant oil, and the refrigerant flows through the expansion valve 214 through the first refrigerant line 251, and is expanded and throttled by the expansion valve 214 to become a low-temperature and low-pressure refrigerant. The lubricating oil of higher temperature pumped out from the oil pump 204 is subjected to heat exchange with the refrigerant of low temperature and low pressure in the oil-cooled plate heat exchanger 205, so that the temperature of the lubricating oil is lowered.
In one embodiment, the oil temperature control system 200 of the present invention may further include a second oil temperature sensor 222. The second oil temperature sensor 222 is disposed in the oil pipeline 241 at the outlet of the oil-cooled plate heat exchanger 205, and can be used to detect the oil temperature at the outlet of the oil-cooled plate heat exchanger 205, that is, the oil temperature after heat exchange by the oil-cooled plate heat exchanger 205. And, the second oil temperature sensor 222 may be connected to the controller, and the second oil temperature sensor 222 may transmit the detected oil temperature at the outlet of the oil-cooled plate heat exchanger 205 to the controller.
The controller may control the load of the compressor 211 to control the oil temperature at the outlet of the oil-cooled plate heat exchanger 205 based on the oil temperature at the outlet of the oil-cooled plate heat exchanger 205 detected by the second oil temperature sensor 222. The controller can control the loading and unloading of the compressor 211 to control the oil temperature at the outlet of the oil-cooled plate heat exchanger 205. When the oil temperature at the outlet of the oil-cooled plate heat exchanger 205 detected by the second oil temperature sensor 222 is high, the controller may control the compressor 211 to be loaded; if the oil temperature at the outlet of the oil-cooled plate heat exchanger 205 detected by the second oil temperature sensor 222 is low, the controller may control the compressor 211 to unload, so as to control the oil temperature at the outlet of the oil-cooled plate heat exchanger 205, thereby ensuring that the oil temperature and the oil viscosity are at the set values.
In one embodiment, the expansion valve 214 is a constant pressure expansion valve 214, thereby ensuring that the refrigerant throttled by the constant pressure expansion valve 214 is maintained at a constant pressure.
The centrifugal chiller further comprises an air extraction device, and the air extraction device comprises an air extraction tank 301. In other embodiments, in the oil temperature control system 200 of the present invention, the constant-pressure expansion valve 214 may be further connected in parallel to the suction tank 301 through the second refrigerant line 252, and the suction tank 301 is connected to the inlet of the compressor 211. Therefore, a cold source can be provided for the air extractor of the centrifugal water chilling unit.
Therefore, the oil temperature control system 200 of the present invention not only has the function of oil temperature control, but also has the function of cooling the air extractor of the centrifugal chiller.
The utility model further provides a centrifugal water chilling unit. The centrifugal chiller may include the oil temperature control system 200 described in the various embodiments above.
The oil temperature control system 200 and the centrifugal chiller having the same 200 according to one or more embodiments of the present invention can precisely control the temperature of the oil supplied to the oil tank 203 and the compressor 211, thereby controlling the viscosity of the lubricant oil and further ensuring the reliable operation of the centrifugal compressor 201.
The oil temperature control system and the centrifugal water chilling unit provided by the utility model are described in detail above. The oil temperature control system and the centrifugal water chiller according to the present invention are described herein by using specific examples, and the above description of the embodiments is only for assisting understanding of the core idea of the present invention and is not intended to limit the present invention. It should be noted that, for those skilled in the art, various improvements and modifications can be made without departing from the spirit and principle of the present invention, and these improvements and modifications should fall within the scope of the appended claims.
Claims (10)
1. The utility model provides an oil temperature control system, its is applied to centrifugal chiller, centrifugal chiller includes the lubricating oil system who connects through the oil pipe way, lubricating oil system includes centrifugal compressor, oil separator, oil tank, oil pump and oil-cooled plate heat exchanger, its characterized in that, oil temperature control system includes through the refrigerating system of first refrigerant tube coupling and is used for right refrigerating system carries out the controller controlled, refrigerating system includes compressor, condenser, places in the oil tank be used for heating coil, the expansion valve of the oil temperature in the oil tank and oil-cooled plate heat exchanger, wherein, the condenser with the exit linkage of compressor, the one end of heating coil is connected to the condenser, the other end of heating coil passes through the expansion valve is connected to oil-cooled plate heat exchanger, the oil-cooled plate heat exchanger is connected to an inlet of the compressor.
2. The oil temperature control system of claim 1, wherein: the oil tank is characterized by further comprising a first oil temperature sensor arranged in the oil tank and used for detecting the oil temperature in the oil tank, and the first oil temperature sensor is connected with the controller.
3. The oil temperature control system of claim 2, wherein: the oil temperature in the oil tank detected by the first oil temperature sensor is lower than a preset oil temperature threshold value, and the controller controls the auxiliary electric heating device to heat the oil temperature in the oil tank.
4. The oil temperature control system of claim 2, wherein: the condenser comprises an air-cooled condenser.
5. The oil temperature control system of claim 4, wherein: the air-cooled condenser is connected with the controller, wherein when the oil temperature in the oil tank detected by the first oil temperature sensor is higher than a preset oil temperature threshold value, the controller controls the air-cooled condenser to dissipate a part of heat.
6. The oil temperature control system of claim 1, wherein: the oil cooling system further comprises a second oil temperature sensor which is arranged in an oil pipeline at the outlet of the oil cooling plate type heat exchanger and used for detecting the oil temperature at the outlet of the oil cooling plate type heat exchanger, and the second oil temperature sensor is connected with the controller.
7. The oil temperature control system of claim 6, wherein: the controller controls and adjusts the load of the compressor to control the oil temperature at the outlet of the oil-cooled plate heat exchanger based on the oil temperature at the outlet of the oil-cooled plate heat exchanger detected by the second oil temperature sensor.
8. The oil temperature control system of claim 1, wherein: the expansion valve is a constant pressure expansion valve.
9. The oil temperature control system of claim 8, wherein: the centrifugal water chilling unit further comprises an air extraction device, the air extraction device comprises an air extraction tank, the constant-pressure expansion valve is connected to the air extraction tank in parallel through a second refrigerant pipeline, and the air extraction tank is connected to an inlet of the compressor.
10. A centrifugal chiller characterized by: comprising an oil temperature control system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121668285.8U CN215638105U (en) | 2021-07-21 | 2021-07-21 | Oil temperature control system and centrifugal water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121668285.8U CN215638105U (en) | 2021-07-21 | 2021-07-21 | Oil temperature control system and centrifugal water chilling unit |
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| Publication Number | Publication Date |
|---|---|
| CN215638105U true CN215638105U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121668285.8U Active CN215638105U (en) | 2021-07-21 | 2021-07-21 | Oil temperature control system and centrifugal water chilling unit |
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| CN (1) | CN215638105U (en) |
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2021
- 2021-07-21 CN CN202121668285.8U patent/CN215638105U/en active Active
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