CN210718178U

CN210718178U - Water chilling unit

Info

Publication number: CN210718178U
Application number: CN201921503801.4U
Authority: CN
Inventors: 王武超; 唐文; 芦晓明
Original assignee: Trane Air Conditioning Systems China Co Ltd
Current assignee: Trane Air Conditioning Systems China Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-06-09
Anticipated expiration: 2029-09-10

Abstract

The utility model provides a water chilling unit, which comprises a compressor, a frequency converter, an oil separator, a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, a first control valve, a second control valve, a fourth control valve, a second control valve, a third control valve, a fourth control valve, a third control valve, a fourth control valve, a fifth control valve; one end of the first pipeline is communicated with the second oil outlet, the other end of the first pipeline is respectively communicated with the second pipeline, the third pipeline and the fourth pipeline, one end of the second pipeline, far away from the first pipeline, is communicated with the rotor cavity, one end of the third pipeline, far away from the first pipeline, is communicated with the fifth pipeline, one end of the fourth pipeline, far away from the first pipeline, is communicated with the first oil inlet, one end of the fifth pipeline is communicated with the first oil outlet, and the other end of the fifth pipeline is communicated with the bearing cavity; at the same time, one of the first control valve and the second control valve is opened and the other is closed.

Description

Water chilling unit

Technical Field

The utility model relates to a refrigeration field especially relates to a water chilling unit.

Background

In the related art, when the water chilling unit operates under a small load, the viscosity of the supplied oil cannot meet the requirement of the bearing, and the oil needs to be treated to improve the viscosity of the oil. Heating the oil to allow refrigerant to dissipate may allow the oil concentration to increase, thereby increasing the oil viscosity. Since the oil temperature is already the highest temperature in the unit, reheating requires an additional heat source, i.e. electrical heating. Electrical heating, in addition to consuming power to reduce unit efficiency, requires additional containers to house the electrical heaters, adding to the difficulty of system layout.

SUMMERY OF THE UTILITY MODEL

The utility model provides a water chilling unit.

Specifically, the utility model discloses a realize through following technical scheme:

a chiller, the chiller comprising:

the compressor comprises a motor, a bearing and a compression rotor, wherein the motor is connected with the compression rotor through the bearing so as to drive the compression rotor to rotate, the compression rotor comprises a rotor cavity, and the bearing comprises a bearing cavity;

the frequency converter is used for driving the motor to work and comprises a radiator, a heat exchange pipe, a first oil inlet and a first oil outlet, the heat exchange pipe is arranged on the radiator, and the first oil inlet and the first oil outlet are respectively communicated with the heat exchange pipe;

an oil separator including a second oil outlet; and

the oil pump comprises a first pipeline, a second pipeline, a third pipeline, a fourth pipeline and a fifth pipeline, wherein one end of the first pipeline is communicated with the second oil outlet, the other end of the first pipeline is respectively communicated with the second pipeline, the third pipeline and the fourth pipeline, one end of the second pipeline, far away from the first pipeline, is communicated with the rotor cavity, one end of the third pipeline, far away from the first pipeline, is communicated with the fifth pipeline, one end of the fourth pipeline, far away from the first pipeline, is communicated with the first oil inlet, one end of the fifth pipeline is communicated with the first oil outlet, and the other end of the fifth pipeline is communicated with the bearing cavity;

and a first control valve is arranged on the third pipeline, a second control valve is arranged on the fourth pipeline, and one of the first control valve and the second control valve is opened and the other is closed at the same moment.

Optionally, a third control valve is arranged on the first pipeline.

Optionally, the second oil outlet is in communication with the third control valve via a filter.

Optionally, a first temperature sensor is arranged on the fifth pipeline;

the water chilling unit further comprises a controller, and the first control valve, the second control valve and the first temperature sensor are respectively and electrically connected with the controller;

and the controller controls the opening and closing of the first control valve and the second control valve according to the temperature value of the first temperature sensor.

Optionally, the frequency converter further comprises a fan and a second temperature sensor for detecting the internal temperature of the frequency converter;

the water chilling unit further comprises a controller, and the fan is electrically connected with the controller;

the controller also controls the rotating speed of the fan according to the temperature value of the second temperature sensor.

Optionally, the heat sink includes a substrate, a plurality of electronic devices, heat dissipation fins and a fan, the electronic devices are disposed on two sides of the substrate, the heat dissipation fins are disposed on one side of the substrate, the heat exchange tubes are disposed on the other side of the substrate, and the heat dissipation fins are arranged along an airflow direction of the fan.

Optionally, the heat exchange tube surrounds the electronic device.

Optionally, the heat exchange tube is embedded in the substrate.

Optionally, the heat exchange tube comprises a two-way tube.

Optionally, the oil separator further comprises a second oil inlet;

the water chilling unit further comprises a sixth pipeline, one end of the sixth pipeline is communicated with the rotor cavity and the bearing cavity, and the other end of the sixth pipeline is communicated with the second oil inlet.

By the above the embodiment of the utility model provides a technical scheme is visible, the utility model discloses utilize the used heat heating oil of converter, save the consumption to the life-span of unit efficiency and converter has been improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a water chiller according to an exemplary embodiment of the present invention;

fig. 2A is a schematic structural diagram of a frequency converter according to an exemplary embodiment of the present invention;

fig. 2B is a schematic structural diagram of a frequency converter according to an exemplary embodiment of the present invention;

fig. 3 is a schematic structural diagram of a water chiller according to another exemplary embodiment of the present invention;

fig. 4 is a block diagram illustrating a water chiller according to an exemplary embodiment of the present invention.

Reference numerals:

1: a compressor; 11: a motor; 12: a compression rotor; 2: a frequency converter; 21: a heat sink; 211: a substrate; 212: an electronic device; 213: a heat dissipating fin; 22: a heat exchange pipe; 23: a first oil inlet; 24: a first oil outlet; 25: a fan; 26: a second temperature sensor; 3: an oil separator; 31: a second oil outlet; 32: a second oil inlet; 4: a first conduit; 5: a second conduit; 6: a third pipeline; 7: a fourth conduit; 8: a fifth pipeline; 9: a first control valve; 10: a second control valve; 20: a third control valve; 30: a filter; 40: a first temperature sensor; 50: a controller; 60: a sixth pipeline; 70: a third temperature sensor.

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 and methods consistent with certain aspects of the invention, 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 invention. 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.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

The water chiller according to the present invention will be described in detail with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

An embodiment of the utility model provides a water chilling unit, combine fig. 1 and fig. 2A, water chilling unit can include compressor 1, converter 2, oil separator 3, first pipeline 4, second pipeline 5, third pipeline 6 way, fourth pipeline 7, fifth pipeline 8, locate the first control valve 9 on third pipeline 6 way and locate the second control valve 10 on fourth pipeline 7.

The compressor 1 includes a motor 11, a bearing (not shown), and a compression rotor 12, wherein the motor 11 is connected to the compression rotor 12 through the bearing to drive the compression rotor 12 to rotate. Further, the compression rotor 12 of the present embodiment includes a rotor chamber, and the bearing includes a bearing chamber.

In this embodiment, the frequency converter 2 is used for the work of the driving motor 11, and the work of the driving motor 11 of the frequency converter 2 is the prior art, and the utility model discloses do not specifically describe this. The frequency converter 2 of the present embodiment includes a radiator 21, a heat exchange tube 22, a first oil inlet 23 and a first oil outlet 24, the heat exchange tube 22 is disposed on the radiator 21, and the first oil inlet 23 and the first oil outlet 24 are respectively communicated with the heat exchange tube 22.

The oil separator 3 comprises a second oil outlet 31, one end of the first pipeline 4 is communicated with the second oil outlet 31, the other end of the first pipeline 4 is communicated with the second pipeline 5, the third pipeline 6 and the fourth pipeline 7 respectively, one end, far away from the first pipeline 4, of the second pipeline 5 is communicated with the rotor cavity, one end, far away from the first pipeline 4, of the third pipeline 6 is communicated with the fifth pipeline 8, one end, far away from the first pipeline 4, of the fourth pipeline 7 is communicated with the first oil inlet 23, one end of the fifth pipeline 8 is communicated with the first oil outlet 24, and the other end of the fifth pipeline 8 is communicated with the bearing cavity.

At the same time, one of the first control valve 9 and the second control valve 10 is opened and the other is closed. Specifically, when the first control valve 9 is opened and the second control valve 10 is closed, the oil path includes: the oil separator 3- > a second oil outlet 31- > a rotor cavity, and the oil separator 3- > the second oil outlet 31- > a first control valve 9- > a bearing cavity. The oil from the oil separator 3 is divided into two paths, one path directly enters the rotor cavity without any treatment, and the compression rotor 12 is lubricated and cooled; and the other path directly enters the bearing cavity without any treatment to lubricate and cool the bearing.

When the first control valve 9 is closed and the second control valve 10 is opened, the oil path includes: the oil separator 3- > a second oil outlet 31- > a rotor cavity, and the oil separator 3- > a second oil outlet 31- > a second control valve 10- > a first oil inlet 23- > a heat exchange pipe 22- > a first oil outlet 24- > a bearing cavity. The oil from the oil separator 3 is divided into two paths, one path directly enters the rotor cavity without any treatment, and the compression rotor 12 is lubricated and cooled; the other path enters a heat exchange tube 22 of the frequency converter 2 from a first oil inlet 23, heat exchange is carried out between the heat exchange tube 22 and a radiator 21 of the frequency converter 2, oil heating is achieved, the concentration and the viscosity of the oil are improved, the heated oil flows out from a first oil outlet 24 and enters a bearing cavity, and lubrication and cooling are carried out on a bearing.

The utility model discloses a water chilling unit utilizes the waste heat heating oil of converter 2, saves the consumption to the life-span of unit efficiency and converter 2 has been improved.

The first pipeline 4, the second pipeline 5, the third pipeline 6, the fourth pipeline 7 and the fifth pipeline 8 can be integrally formed or partially integrally formed; of course, the first duct 4, the second duct 5, the third duct 6, the fourth duct 7 and the fifth duct 8 may also be separate ducts.

In this embodiment, a connection port is disposed in the middle of the fifth pipeline 8, and one end of the third pipeline 6, which is far away from the first pipeline 4, is communicated with the connection port.

In some embodiments, a third control valve 20 is disposed on the first pipeline 4, and the third control valve 20 of the present embodiment is an oil main valve. When the third control valve 20 is opened, the oil path of the water chilling unit circulates, specifically, when the third control valve 20 is opened, the first control valve 9 is opened, and the second control valve 10 is closed, the oil path includes: the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a rotor cavity, and the oil separator 3- > the second oil outlet 31- > the third control valve 20- > a first control valve 9- > a bearing cavity; when the third control valve 20 is opened, the first control valve 9 is closed, and the second control valve 10 is opened, the oil path includes: the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a rotor cavity, and the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a second control valve 10- > a first oil inlet 23- > a heat exchange pipe 22- > a first oil outlet 24- > a bearing cavity. When the third control valve 20 is closed, the oil circuit of the water chilling unit is cut off.

Further, in some embodiments, the second oil outlet 31 communicates with the third control valve 20 via a filter 30, and debris in the oil is filtered by the filter 30.

Referring to fig. 3 and 4, the fifth pipeline is provided with a first temperature sensor 40, the water chilling unit further includes a controller 50, and the first control valve 9, the second control valve 10, the first temperature sensor 40 and the controller 50 are electrically connected. In this embodiment, the controller 50 controls the opening and closing of the first control valve 9 and the second control valve 10 according to the temperature value of the first temperature sensor 40. Specifically, the controller 50 calculates the minimum allowable operating frequency of the water chiller unit according to the temperature value of the first temperature sensor 40, when the actual operating frequency of the water chiller unit approaches the minimum allowable operating frequency, the second control valve 10 is opened by the control at this time, the first control valve is closed after a certain waiting time (the oil supply flow caused by the oil circuit cavitation is prevented from being unstable), after the oil is heated by the heat exchange pipe 22 of the frequency converter 2, the calculated minimum allowable operating frequency of the controller 50 is reduced, and the water chiller unit can continue to unload. It should be noted that, the existing calculation method is adopted to calculate the minimum allowable operating frequency of the water chiller unit according to the temperature value of the first temperature sensor 40, and the embodiment is not particularly limited.

The frequency converter 2 of the present embodiment is an air-cooled frequency converter.

The traditional radiator of the air-cooled frequency converter only comprises a base plate and fins at the back of the base plate, various electronic components are arranged on the base plate, and when the air-cooled frequency converter runs, a fan of the frequency converter generates air flow at the fins at the back to take away heat of the electronic components conducted by the base plate.

In this embodiment, referring to fig. 2A and fig. 2B, the heat sink 21 may include a substrate 211, a plurality of electronic devices 212 (such as processors, sensors, etc.) disposed on the substrate 211, heat dissipation fins 213, and a fan 25, wherein the electronic devices 212 are distributed on two sides of the substrate 211, the heat dissipation fins 213 are disposed on one side of the substrate 211, the heat exchange tubes 22 are disposed on the other side of the substrate 211, and the heat dissipation fins 213 are arranged along an airflow direction of the fan 25. This allows oil (oil temperature at about 20 degrees under light load) to flow through these heat exchange tubes 22, to be heated by the electronic devices 212 (temperature above 80 degrees) on the substrate 211, and to carry away power consumption of the electronic devices 212. The oil flowing in the heat exchange tube 22 is heated by the heat generated by the electronic components, so that the concentration and viscosity of the oil flowing into the bearing cavity meet the requirements of the bearing, and the oil is not required to be heated by an additional electric heating source in the water chilling unit, thereby saving the power consumption, and improving the efficiency of the water chilling unit and the service life of the frequency converter 2. At the same time, the fan 25 generates air flow at the heat dissipating fins during operation, and takes away heat of the electronic device 212 conducted through the substrate 211.

The arrangement of the heat exchange tube 22 on the substrate 211 can be designed as required, for example, in some embodiments, referring to fig. 2A, the heat exchange tube 22 surrounds the electronic device 212, and the heat exchange tube 22 of this embodiment surrounds the electronic device 212, so that the oil in the heat exchange tube 22 can absorb the heat generated by the electronic device more sufficiently. Of course, the heat exchange tubes 22 may be arranged on the substrate 211 in other arrangements.

The heat exchange tube 22 of this embodiment is fixed on the substrate 211, and the fixing manner of the heat exchange tube 22 and the substrate 211 can also be designed as required, optionally, the heat exchange tube 22 is embedded on the substrate 211, in this embodiment, the substrate 211 is provided with a groove, and the heat exchange tube 22 is embedded in the groove. It will be understood that other means for fixing the heat exchange tube 22 to the base 211 may be employed.

Further, in some embodiments, to reduce pressure drop, the heat exchange tubes 22 include a two-way conduit, i.e., a two-way oil path.

In this embodiment, the frequency converter 2 further includes a second temperature sensor 26 for detecting the internal temperature of the frequency converter 2, and the fan 25 and the second temperature sensor 26 are electrically connected to the controller 50, respectively. The controller 50 of this embodiment further controls the rotation speed of the fan 25 according to the temperature value of the second temperature sensor 26, and switches the fan 25 to maintain the frequency converter 2 at a higher temperature, but not too high, so as to heat the oil. When the oil heating function is on, the fan 25 may be throttled or turned off as required to reduce system power consumption.

Optionally, the rotation speed of the fan 25 is divided into three gears: fully off, half on, and fully on. The temperature value of the second temperature sensor 26 needs to be controlled to be 70-90 degrees, if the temperature value of the second temperature sensor 26 is within the target temperature range, the current fan 25 gear is kept, and if the temperature value of the second temperature sensor 26 is lower than 70 degrees, the fan 25 gear is reduced by one gear until the fan 25 is completely turned off. If the temperature value of the second temperature sensor 26 is higher than 90, the fan 25 is shifted up by one gear until the fan 25 is fully turned on. By adopting the control mode of the rotating speed of the fan 25, the temperature of the frequency converter 2 is ensured to be within a reasonable range, and the oil is ensured to take away the maximum waste heat.

Referring to fig. 1 and 3 again, the oil separator 3 may further include a second oil inlet 32, the water chilling unit further includes a sixth pipeline 60, one end of the sixth pipeline 60 is communicated with the rotor cavity and the bearing cavity, and the other end of the sixth pipeline 60 is communicated with the second oil inlet 32, so that oil is recycled. When the third control valve 20 is opened, the first control valve 9 is opened, and the second control valve 10 is closed, the oil path includes: the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a rotor cavity- > a second oil inlet 32- > the oil separator 3, and the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a first control valve 9- > a bearing cavity- > a second oil inlet 32- > the oil separator 3; when the third control valve 20 is opened, the first control valve 9 is closed, and the second control valve 10 is opened, the oil path includes: the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a rotor cavity- > a second oil inlet 32- > the oil separator 3, and the oil separator 3- > a second oil outlet 31- > a third control valve 20- > a second control valve 10- > a first oil inlet 23- > a heat exchange pipe 22- > a first oil outlet 24- > a bearing cavity- > a second oil inlet 32- > the oil separator 3.

Further optionally, a third temperature sensor 70 is disposed on the sixth pipeline 60, the third temperature sensor 70 is electrically connected to the controller 50, and the controller 50 further determines whether the temperature of the oil flowing into the bearing cavity is appropriate according to the temperature value of the third temperature sensor 70.

The first control valve 9, the second control valve 10, and the third control valve 20 may be solenoid valves, and the present embodiment does not limit the types of the first control valve 9, the second control valve 10, and the third control valve 20. The first temperature sensor 40, the second temperature sensor 26, and the third temperature sensor 70 may be digital temperature sensors or analog temperature sensors, and the type of the first temperature sensor 40, the second temperature sensor 26, and the third temperature sensor 70 is not limited in this embodiment.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A chiller, the chiller comprising:

an oil separator including a second oil outlet; and

2. The chiller according to claim 1 wherein a third control valve is provided on said first conduit.

3. The chiller according to claim 2, wherein said second oil outlet communicates with said third control valve through a filter.

4. The water chilling unit according to claim 1, wherein a first temperature sensor is provided on the fifth pipe;

5. The water chilling unit according to claim 1, wherein the inverter further includes a fan and a second temperature sensor for detecting an internal temperature of the inverter;

the water chilling unit further comprises a controller, and the fan and the second temperature sensor are electrically connected with the controller respectively;

6. The water chilling unit according to claim 1, wherein the heat sink includes a base plate, a plurality of electronic devices disposed on the base plate, heat dissipation fins and a fan, the electronic devices are distributed on two sides of the base plate, the heat dissipation fins are disposed on one side of the base plate, the heat exchange tubes are disposed on the other side of the base plate, and the heat dissipation fins are arranged along an airflow direction of the fan.

7. The chiller according to claim 6, wherein said heat exchange tubes surround said electronics.

8. The water chilling unit according to claim 6, wherein the heat exchange tube is embedded in the base plate.

9. The chiller according to claim 6 wherein said heat exchange tube comprises a two-way tube.

10. The water chilling unit of claim 1, wherein the oil separator further comprises a second oil inlet;