CN218936697U - Water chilling unit and central air conditioner - Google Patents

Abstract

The application relates to the technical field of central air conditioners and discloses a water chilling unit. The water chilling unit comprises a compressor, a condenser, a throttling element and an evaporator which are sequentially arranged on a refrigerant circulation loop. The water chilling unit also comprises a bypass pipeline and a generator. The bypass pipeline is used for communicating the compressor and the evaporator, and can guide part of refrigerant discharged by the compressor to the evaporator when the compressor is in a low-load working condition. The generator is arranged in the bypass pipeline, and the generator can be driven by the refrigerant in the bypass pipeline to generate electricity. The water chilling unit can reasonably utilize the energy contained in the refrigerant separated by the bypass pipeline, and unnecessary waste is reduced. The application also discloses a central air conditioner.

Description

Water chilling unit and central air conditioner

Technical Field

The application relates to the technical field of central air conditioners, for example to a water chilling unit and a central air conditioner.

Background

The central air conditioner is generally configured with a water chiller, which can cool the circulating water and convey the cooled circulating water to a user side of the central air conditioner so as to provide cooling capacity for the user side. The operation of the compressor in the water chilling unit needs a certain rotation speed and an air suction and exhaust pressure ratio, and the alarm stop of the compressor can be caused by the mismatching of the rotation speed and the air suction and exhaust pressure ratio. For example, during low load conditions, the compressor may be at too low a rotational speed, resulting in frequent start-up and shut-down of the compressor; when the high load condition is switched to the low load condition, the rotation speed of the compressor suddenly drops, and the suction-discharge pressure ratio cannot suddenly drop, so that the compressor surge is caused.

In the related art, a water chiller is provided with a bypass line, one end of which is in communication with an exhaust end of a compressor. Part of refrigerant discharged by the compressor can be separated through the bypass pipeline, so that the compressor can be ensured to stably run.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

in the related art, energy contained in the refrigerant separated by the bypass line cannot be effectively utilized, and unnecessary waste is caused.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present application and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a water chilling unit and a central air conditioner, which can reasonably utilize energy contained in a refrigerant separated by a bypass pipeline and reduce unnecessary waste.

In some embodiments, the water chiller includes a compressor, a condenser, a throttling element, and an evaporator disposed in sequence on a refrigerant circulation loop, the water chiller further comprising: the bypass pipeline is used for communicating the compressor and the evaporator and can guide part of refrigerant discharged by the compressor to the evaporator when the compressor is in a low-load working condition; and a generator provided in the bypass line and capable of generating power driven by the refrigerant in the bypass line.

Optionally, the compressor includes a discharge port, the discharge port being in communication with the condenser through a first communication pipe; the water chiller further comprises: a check valve provided in the first communication pipe, the check valve being capable of restricting a flow direction of the refrigerant to flow from the exhaust port to the condenser; the first end of the bypass pipeline is connected with the first communication pipe, and the first end of the bypass pipeline is positioned between the one-way valve and the condenser.

Optionally, the evaporator includes: a refrigerant passage; the liquid homogenizing element is arranged at the liquid inlet end of the refrigerant passage; the refrigerant flowing out of the second end of the bypass pipeline can uniformly flow into the refrigerant passage through the liquid homogenizing element.

Optionally, the liquid-homogenizing element is a liquid-homogenizing plate; the evaporator further includes: a housing having the refrigerant passage therein; the plurality of heat exchange tubes are arranged in the shell, and circulating liquid in the plurality of heat exchange tubes can exchange heat with the refrigerant flowing through the refrigerant passage; the liquid homogenizing plate is arranged at the bottom of the inner cavity of the shell, and divides the inner cavity of the shell into a liquid inlet cavity positioned below and a refrigerant passage positioned above; the second end of the bypass pipeline is communicated with the liquid inlet cavity.

Optionally, the generator is capable of providing electrical energy to the compressor and/or to electrical components of the chiller.

Optionally, the generator is electrically connected to the compressor to provide electrical energy to the compressor using the generator.

Optionally, the water chiller further includes: the storage input end of the storage battery is electrically connected with the power supply end of the generator so as to store electric energy from the generator; the power supply output end of the storage battery is electrically connected with the compressor and/or the electric components of the water chilling unit so as to supply power to the compressor and/or the electric components of the water chilling unit.

Optionally, the water chiller further includes: the control valve is arranged on the bypass pipeline and can control the quantity of the refrigerant entering the bypass pipeline; and/or a vibration sensor, which is arranged on the compressor and is used for detecting the vibration value of the compressor.

Optionally, the water chiller further includes: the signal input end of the controller is in communication connection with the vibration sensor so as to periodically receive the vibration value of the compressor detected by the vibration sensor; the control output end is in communication connection with the control valve so as to control and conduct the control valve or adjust the opening of the control valve according to the received vibration value of the compressor.

In some embodiments, the central air conditioner comprises the water chiller set described above.

The water chilling unit and the central air conditioner provided by the embodiment of the disclosure can realize the following technical effects:

the water chilling unit provided by the embodiment of the disclosure comprises a bypass pipeline and a generator arranged on the bypass pipeline. The bypass pipeline can be communicated with the compressor and the evaporator, and the bypass pipeline can guide part of refrigerant discharged by the compressor to the evaporator when the compressor is in a low-load working condition. Therefore, the exhaust pressure of the compressor can be reduced, the suction-exhaust pressure ratio of the compressor is maintained, and the normal operation of the compressor is ensured. Meanwhile, the refrigerant discharged by the compressor is a high-temperature high-pressure gaseous refrigerant, and the high-temperature high-pressure gaseous refrigerant entering the bypass pipeline can drive the generator to generate power. Therefore, the energy contained in the refrigerant separated by the bypass pipeline can be reasonably utilized, and unnecessary waste is reduced. In addition, because the refrigerant discharged by the compressor is a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant directly enters the evaporator to influence the normal operation of the evaporator and even cause the damage of the evaporator. By arranging the generator on the bypass pipeline, the refrigerant flowing through the bypass pipeline drives the generator to generate electricity, and the energy of the refrigerant can be converted into electric energy. Therefore, the temperature, pressure and flow rate of the refrigerant can be reduced, and the influence of the refrigerant on the evaporator can be reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic structural diagram of a water chiller provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another water chiller provided in an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another water chiller provided in an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a refrigerant flow direction structure of a water chiller provided in an embodiment of the disclosure.

Reference numerals:

10. a compressor; 101. an exhaust port; 102. an air suction port; 20. a condenser; 30. a throttle element; 40. an evaporator; 401. a circulating liquid inlet; 402. a circulating liquid outlet; 50. a bypass line; 60. a generator; 70. a storage battery; 80. a vibration sensor; 01. a first communication pipe; 02. a one-way valve; 03. and a control valve.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

Central air conditioning generally refers to a large air conditioning system that includes one or more cold and heat source systems and a plurality of air conditioning systems. The central air conditioner is different from a common household air conditioner, and can be used in a large-scale building, and a plurality of air conditioning systems are arranged at a plurality of user terminals so as to provide heat/cold for the plurality of user terminals by using the plurality of air conditioning systems. The water chiller is a refrigeration source of a central air conditioner, can cool circulating water, can provide cooled circulating water for a plurality of air conditioning systems, and further utilizes the air conditioning systems to send the cooling capacity of the cooled circulating water to a user side.

The operation of the compressor in the water chilling unit needs a certain rotation speed and an air suction and exhaust pressure ratio, and the alarm stop of the compressor can be caused by the mismatching of the rotation speed and the air suction and exhaust pressure ratio. For example, during low load conditions, the compressor may be at too low a rotational speed, resulting in frequent start-up and shut-down of the compressor; when the high load condition is switched to the low load condition, the rotation speed of the compressor suddenly drops, and the suction-discharge pressure ratio cannot suddenly drop, so that the compressor surge is caused.

In the related art, a water chiller is provided with a bypass line, one end of which is in communication with an exhaust end of a compressor. The bypass pipeline is arranged to separate out part of refrigerant discharged by the compressor so as to ensure the stable operation of the compressor. However, the energy contained in the refrigerant separated by the bypass line in the related art cannot be effectively utilized, which may cause unnecessary waste.

Therefore, the embodiment of the disclosure provides a water chilling unit and a central air conditioner, which can reasonably utilize energy contained in a refrigerant separated by a bypass pipeline, and reduce unnecessary waste.

In one aspect, an embodiment of the present disclosure provides a water chiller.

Referring to fig. 1 to 4, the chiller includes a compressor 10, a condenser 20, a throttling element 30, and an evaporator 40, which are sequentially disposed on a refrigerant circulation circuit. The chiller further includes a bypass line 50 and a generator 60.

The bypass line 50 is used to communicate the compressor 10 and the evaporator 40, and the bypass line 50 is capable of guiding a portion of the refrigerant discharged from the compressor 10 to the evaporator 40 when the compressor 10 is in a low load condition. The generator 60 is provided in the bypass line 50, and can be driven by the refrigerant in the bypass line 50 to generate power.

The water chiller provided in the embodiments of the present disclosure includes a bypass line 50 and a generator 60 disposed in the bypass line 50. The bypass line 50 can communicate the compressor 10 and the evaporator 40, and the bypass line 50 can guide a part of the refrigerant discharged from the compressor 10 to the evaporator 40 when the compressor 10 is in a low load condition. In this way, the discharge pressure of the compressor 10 can be reduced, the suction-discharge pressure ratio of the compressor 10 can be maintained, and the normal operation of the compressor 10 can be ensured. Meanwhile, the refrigerant discharged from the compressor 10 is a high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant entering the bypass line 50 can drive the generator 60 to generate electricity. In this way, the energy contained in the refrigerant separated by the bypass line 50 can be reasonably utilized, and unnecessary waste can be reduced. In addition, since the refrigerant discharged from the compressor 10 is a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant directly enters the evaporator 40 to affect the normal operation of the evaporator 40, and even damage the evaporator 40. By providing the generator 60 in the bypass line 50, the refrigerant flowing through the bypass line 50 drives the generator 60 to generate electricity, and the energy of the refrigerant can be converted into electric energy. In this way, the temperature, pressure and flow rate of the refrigerant can be reduced, and the influence of the refrigerant on the evaporator 40 can be reduced.

It can be understood that the refrigerant circulation loop is circulated with refrigerant, the compressor 10 sucks in low-temperature low-pressure gaseous refrigerant and compresses the low-temperature low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant; the high-temperature high-pressure gaseous refrigerant enters the condenser 20, and is condensed to release heat and reduce the temperature in the condenser 20; then the refrigerant is throttled by the throttling element 30, and the temperature and the pressure are further reduced; the throttled refrigerant enters the evaporator 40, absorbs heat in the evaporator 40 to gasify into a low-temperature low-pressure gaseous refrigerant, and the gaseous refrigerant enters the compressor 10 to be compressed into a high-temperature high-pressure gaseous refrigerant, so that the circulation continuously works.

The bypass line 50 can guide a part of the refrigerant discharged from the compressor 10 to the evaporator 40 when the compressor 10 is in the low load condition, and another part of the refrigerant discharged from the compressor 10 enters the condenser 20.

The suction-exhaust pressure ratio generally refers to: exhaust pressure versus suction pressure.

Optionally, the compressor comprises a magnetic levitation compressor. The magnetic suspension compressor utilizes the principle that like magnetic poles repel and opposite magnetic poles attract, and adds a corresponding electromagnetic field between a rotor and a stator of a bearing, and the rotor and the stator are in a relative suspension state by controlling the electromagnetic field. In this way, the rotor and stator are not in contact, no mechanical friction is generated during rotation of the rotor relative to the stator, and mechanical bearings and the lubrication system necessary for the mechanical bearings are no longer required. The problems associated with lubricating oil in magnetic levitation compressors are no longer present.

In some embodiments, the compressor 10 includes a discharge port 101, the discharge port 101 being in communication with the condenser 20 via a first communication line 01.

The water chiller further includes a check valve 02. The check valve 02 is provided in the first communication pipe 01, and the check valve 02 can restrict the flow direction of the refrigerant to flow from the exhaust port 101 to the condenser 20. The first end of the bypass line 50 is connected to the first communication pipe 01, and the first end of the bypass line 50 is located between the check valve 02 and the condenser 20.

By the arrangement, damage to the compressor caused by refrigerant backflow can be avoided. Specifically, the compressor 10 discharges a high-temperature and high-pressure gaseous refrigerant from the discharge port 101, and the high-temperature and high-pressure gaseous refrigerant enters the condenser 20 through the first communication pipe 01. By providing the check valve 02 in the first communication pipe 01, the refrigerant in the condenser 20 can be prevented from flowing back to the compressor, and damage to the compressor caused by the refrigerant flowing back can be avoided. Accordingly, the first end of the bypass line 50 is located between the check valve 02 and the condenser 20, so that the refrigerant in the evaporator 40 can be prevented from flowing back into the compressor through the bypass line 50, and damage to the compressor caused by the backflow of the refrigerant can be avoided.

Optionally, referring to fig. 1, the compressor 10 further includes a suction port 102, the suction port 102 being in communication with the evaporator 40. The compressor 10 sucks the low-temperature low-pressure gaseous refrigerant from the evaporator 40 through the suction port 102.

In some embodiments, the evaporator 40 includes a refrigerant passage and a liquid-homogenizing element. The liquid homogenizing element is arranged at the liquid inlet end of the refrigerant passage. The refrigerant flowing out of the second end of the bypass line 50 can uniformly flow into the refrigerant passage through the liquid equalizing element.

By this arrangement, the refrigerant flowing out of the second end of the bypass line 50 can be uniformly introduced into the evaporator 40, and the refrigerant flowing out of the second end of the bypass line 50 can be prevented from flowing too much to impact the evaporator.

The refrigerant outlet of the evaporator 40 communicates with the suction port of the compressor 10 to allow the compressor 10 to suck a low-temperature low-pressure gaseous refrigerant from the evaporator 40 through the suction port 102.

In some embodiments, the liquid-homogenizing element is a liquid-homogenizing plate. The evaporator 40 further includes a housing and a plurality of heat exchange tubes. The interior of the housing is configured with a refrigerant passage. The plurality of heat exchange pipes are arranged in the shell, and circulating liquid in the plurality of heat exchange pipes can exchange heat with the refrigerant flowing through the refrigerant passage. The liquid homogenizing plate is arranged at the bottom of the inner cavity of the shell, and divides the inner cavity of the shell into a liquid inlet cavity positioned below and a refrigerant passage positioned above; a second end of the bypass line 50 communicates with the inlet chamber.

The refrigerant flowing out of the second end of the bypass pipeline 50 firstly enters the liquid inlet cavity and then flows into the refrigerant passage through the liquid homogenizing plate, so that the refrigerant entering the refrigerant passage has a proper flow velocity, and the impact on the evaporator 40 is avoided.

Alternatively, the evaporator 40 is a flooded heat exchanger.

Optionally, a circulating fluid inlet 401 and a circulating fluid outlet 402 are further disposed on the casing of the evaporator 40, and two ends of one or more heat exchange tubes are connected to the circulating fluid inlet 401 and the circulating fluid outlet 402, so as to realize the flow of the circulating fluid.

Optionally, the generator 60 includes an impeller generator, and an impeller of the impeller generator is driven by the high-temperature and high-pressure gaseous refrigerant to rotate to drive the generator to generate electricity, so as to realize energy conversion. The temperature, pressure and flow rate of the gaseous refrigerant are reduced, so that the influence of the high-pressure and high-flow rate gaseous refrigerant on the evaporator is reduced.

In some embodiments, the generator 60 is capable of providing electrical power to the compressor 10 and/or electrical components of the chiller.

The electrical energy generated by the generator 60, after being processed, may directly participate in driving the compressor 10 and/or be provided to electrical components of the chiller. In this way, the energy contained in the refrigerant separated by the bypass line 50 can be reasonably utilized, and the coefficient of performance of the air conditioner can be improved.

Optionally, the generator 60 is electrically connected to the compressor 10 to provide electrical power to the compressor 10 using the generator 60.

In this way, the energy contained in the refrigerant separated by the bypass line 50 can be reasonably utilized, and the coefficient of performance of the air conditioner can be improved.

Optionally, referring to fig. 2, the water chiller further includes a battery 70, an electrical storage input of the battery 70 being electrically connected to a power supply of the generator 60 to store electrical energy from the generator 60; the power supply output terminal of the storage battery 70 is electrically connected with the compressor 10 and/or the electric components of the water chiller so as to supply power to the compressor 10 and/or the electric components of the water chiller.

The battery 70 is capable of storing electrical energy and providing the stored electrical energy to electrical components of the compressor 10 and/or the chiller. As such, the amount of power stored in battery 70 may be utilized to facilitate smooth shut down of compressor 10 and/or electrical components of the chiller in the event of a sudden power outage.

Optionally, the electrical components of the water chiller include an electrically controlled valve, a pump, a circuit board, and the like.

Optionally, referring to fig. 2, the water chiller further includes a control valve 03. The control valve 03 is provided in the bypass line 50, and the control valve 03 can control the amount of refrigerant entering the bypass line 50.

By providing the control valve 03 in the bypass line 50, the discharge pressure of the compressor 10 can be adjusted, the suction-discharge pressure ratio of the compressor 10 can be maintained, and the normal operation of the compressor 10 can be ensured. For example, when the high load condition is switched to the low load condition, the pressure at the exhaust end of the compressor can be quickly reduced by opening the control valve 03, so that the rotation speed of the compressor is matched with the suction-exhaust pressure ratio, and the surge of the compressor is avoided.

It is understood that the larger the opening of the control valve 03 is, the larger the amount of refrigerant separated from the discharge end of the compressor 10 by the bypass line 50 is.

Alternatively, the control valve 03 is an electrically operated ball valve. The setting is so that the opening degree of the electric ball valve is convenient to be controlled remotely, thereby realizing the remote control of the refrigerant quantity entering the bypass pipeline 50.

The electric ball valve comprises a driving mechanism and a ball valve, wherein the driving mechanism can be remotely controlled to drive the ball valve to cut off or conduct media in a pipeline. The electric ball valve is divided into an electric flange ball valve, an electric butt-clamp ball valve, an electric welding ball valve, an electric screw ball valve and the like.

Optionally, referring to fig. 3, the chiller further includes a vibration sensor 80. The vibration sensor 80 is provided to the compressor 10 for detecting a vibration value of the compressor 10.

By providing the vibration sensor 80, the vibration value of the compressor 10 can be obtained, and it can be determined whether or not the compressor 10 is surging.

In some embodiments, the chiller further comprises a controller. The signal input end of the controller is in communication connection with the vibration sensor so as to periodically receive the vibration value of the compressor 10 detected by the vibration sensor; the control output end is in communication connection with the control valve 03 to control the control valve 03 or adjust the opening of the control valve 03 according to the received vibration value of the compressor 10.

When the current vibration value of the compressor 10 is greater than the preset vibration value, the control valve 03 is controlled to be conducted, part of refrigerant of the exhaust port 101 is separated, and the pressure at the exhaust port 101 is reduced. By this arrangement, the surge of the compressor can be alleviated, and the damage to the compressor 10 can be reduced.

Alternatively, in the case where the current vibration value is smaller than the preset vibration value, the control valve 03 is controlled to be closed.

In the case where the current vibration value is smaller than the preset vibration value, the surge control is not required, and the control valve 03 is maintained in a closed state.

Alternatively, controlling the opening degree of the control valve 03 or adjusting the opening degree of the control valve 03 according to the received vibration value of the compressor 10 includes:

in the case where the current vibration value of the compressor 10 is greater than or equal to the preset vibration value, the opening degree of the control valve 03 is increased to X, X > 0.

Alternatively, in the case where the current vibration value of the compressor 10 is greater than or equal to the preset vibration value, after the opening degree of the control valve 03 is increased to X, it further includes:

continuously detecting a current vibration value, and maintaining the opening degree of the control valve 03 to be X under the condition that the current vibration value is smaller than a preset vibration value; in the case where the current vibration value is greater than or equal to the preset vibration value, the opening degree of the control valve 03 is controlled to be increased by a every predetermined time period h until the current vibration value is less than the preset vibration value. At this time, the opening degree of the control valve 03 is x+ah.

Alternatively, in the case where the opening degree of the control valve 03 reaches the maximum value, and the current vibration value is greater than or equal to the preset vibration value, the alarm mechanism is controlled to alarm. When the control valve 03 is opened to the maximum opening degree, the current vibration value is still too large, and the selected opening degree of the control valve 03 is too small, so that alarm processing is performed.

When the water chiller normally operates, the vibration value of the compressor 10 is obtained, and if the current vibration value of the compressor 10 is smaller than the preset vibration value, the control valve 03 is closed. If the current vibration value of the compressor 10 is greater than or equal to the preset vibration value, the opening degree of the control valve 03 is adjusted to X. After the opening degree of the control valve 03 is increased to X, continuously detecting the current vibration value, and maintaining the opening degree of the control valve 03 to X under the condition that the current vibration value is smaller than the preset vibration value; in the case where the current vibration value is greater than or equal to the preset vibration value, the opening degree of the control valve 03 is controlled to be increased by a every predetermined time period h until the current vibration value is less than the preset vibration value.

Optionally, the preset vibration value ranges from 0.4mm/s to 0.6mm/s. For example, the preset vibration value may be 0.5mm/s.

In a second aspect, embodiments of the present disclosure provide a central air conditioner. The central air conditioner comprises the water chilling unit in any embodiment.

The water chilling unit of the central air conditioner provided by the embodiment of the disclosure comprises a bypass pipeline 50 and a generator 60 arranged on the bypass pipeline 50. The bypass line 50 can communicate the compressor 10 and the evaporator 40, and the bypass line 50 can guide a part of the refrigerant discharged from the compressor 10 to the evaporator 40 when the compressor 10 is in a low load condition. In this way, the exhaust pressure of the compressor 10 can be reduced, the suction-exhaust pressure ratio of the compressor 10 can be maintained, the normal operation of the compressor 10 can be ensured, and further the stable operation of the central air conditioner can be ensured. Meanwhile, the refrigerant discharged from the compressor 10 is a high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant entering the bypass line 50 can drive the generator 60 to generate electricity. In this way, the energy contained in the refrigerant separated by the bypass line 50 can be reasonably utilized, and unnecessary waste can be reduced. In addition, since the refrigerant discharged from the compressor 10 is a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant directly enters the evaporator 40 to affect the normal operation of the evaporator 40, and even damage the evaporator 40. By providing the generator 60 in the bypass line 50, the refrigerant flowing through the bypass line 50 drives the generator 60 to generate electricity, and the energy of the refrigerant can be converted into electric energy. In this way, the temperature, pressure and flow rate of the refrigerant can be reduced, and the influence of the refrigerant on the evaporator 40 can be reduced.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The utility model provides a cooling water set, includes compressor, condenser, throttling element and the evaporimeter that sets gradually on refrigerant circulation circuit, its characterized in that, cooling water set still includes:

a bypass line for communicating the compressor and the evaporator, the bypass line being capable of guiding a portion of refrigerant discharged from the compressor to the evaporator when the compressor is in a low load condition; and, a step of, in the first embodiment,

and the generator is arranged in the bypass pipeline and can be driven by the refrigerant in the bypass pipeline to generate power.

2. The chiller according to claim 1 wherein said compressor includes an exhaust port in communication with said condenser via a first communication line; the water chiller further comprises:

a check valve provided in the first communication pipe, the check valve being capable of restricting a flow direction of the refrigerant to flow from the exhaust port to the condenser;

the first end of the bypass pipeline is connected with the first communication pipe, and the first end of the bypass pipeline is positioned between the one-way valve and the condenser.

3. The chiller according to claim 2 wherein the evaporator comprises:

a refrigerant passage; and, a step of, in the first embodiment,

the liquid homogenizing element is arranged at the liquid inlet end of the refrigerant passage;

the refrigerant flowing out of the second end of the bypass pipeline can uniformly flow into the refrigerant passage through the liquid homogenizing element.

4. The water chiller of claim 3, wherein the liquid homogenizing element is a liquid homogenizing plate; the evaporator further includes:

a housing having the refrigerant passage therein; and, a step of, in the first embodiment,

the plurality of heat exchange tubes are arranged in the shell, and circulating liquid in the plurality of heat exchange tubes can exchange heat with the refrigerant flowing through the refrigerant passage;

the liquid homogenizing plate is arranged at the bottom of the inner cavity of the shell, and divides the inner cavity of the shell into a liquid inlet cavity positioned below and a refrigerant passage positioned above; the second end of the bypass pipeline is communicated with the liquid inlet cavity.

5. The water chiller according to claim 1 wherein,

the generator can provide electric energy for the compressor and/or the electric components of the water chilling unit.

6. The water chiller according to claim 5 wherein,

the generator is electrically connected to the compressor to provide electrical energy to the compressor using the generator.

7. The water chiller of claim 5, further comprising:

the storage input end of the storage battery is electrically connected with the power supply end of the generator so as to store electric energy from the generator; the power supply output end of the storage battery is electrically connected with the compressor and/or the electric components of the water chilling unit so as to supply power to the compressor and/or the electric components of the water chilling unit.

8. The water chiller according to any one of claims 1 to 7 wherein the water chiller further comprises:

the control valve is arranged on the bypass pipeline and can control the quantity of the refrigerant entering the bypass pipeline; and/or the number of the groups of groups,

and the vibration sensor is arranged on the compressor and used for detecting the vibration value of the compressor.

9. The water chiller of claim 8, further comprising:

the signal input end of the controller is in communication connection with the vibration sensor so as to periodically receive the vibration value of the compressor detected by the vibration sensor; the control output end is in communication connection with the control valve so as to control and conduct the control valve or adjust the opening of the control valve according to the received vibration value of the compressor.

10. A central air conditioner comprising a water chiller as claimed in any one of claims 1 to 9.

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