High-temperature air conditioning device

Disclosed is a high-temperature air conditioning device. By changing an arrangement mode of throttle valves, a pressure of refrigerant inside a low-pressure pipeline is made to be lower than a pressure of refrigerant inside a medium-pressure pipeline, thus ensuring that the refrigerant, used for cooling components, inside the low-pressure pipeline has a low pressure, thereby solving a problem in the prior art that a frequency converter, a motor and lubricating oil are not cooled sufficiently or cannot be cooled due to excessively high evaporation pressure.

FIELD

The present disclosure relates to the field of air-conditioning, more particularly, to a high-temperature air conditioning device.

BACKGROUND

In a conventional air conditioning device, the temperature of the outflow chilled water of the evaporator is about 7° C. The frequency converter, the motor, the lubricating oil, etc. are often cooled by refrigerant, and the technical solution is as follows: the air conditioning device includes a compressor01, a condenser02, an evaporator03, a first throttle valve04, a second throttle valve05, and components06to be cooled (such as a frequency converter, a motor, lubricating oil and so on), and its structure is shown inFIG. 1. The high-temperature and high-pressure liquid refrigerant is divided into two streams after flowing out of the condenser02. One stream of liquid refrigerant (in pipeline a) flows through the first throttle valve04and becomes low-temperature and low-pressure refrigerant to flow into the evaporator03to refrigerate; the other stream of liquid refrigerant (in pipeline b) flows through the second throttle valve05and becomes low-temperature and low-pressure refrigerant to cool the frequency converter, the motor, the lubricating oil, etc., then flows into the evaporator03; the low-temperature and low-pressure gaseous refrigerant flowing out of the outlet of the evaporator03flows into the compressor01and is compressed to be high-temperature and high-pressure gaseous refrigerant; then the high-temperature and high-pressure gaseous refrigerant flows into the condensation02; and the process above is repeated.

However, as for some air conditioning devices, such as a high-temperature refrigeration device with chilled water, a heating pump device, etc., the evaporation temperature in the evaporator03is excessively high, which will cause the pressure of the high-temperature and high-pressure liquid refrigerant in the pipeline b to be excessively high after it flows through the second throttle valve05, and cause the motor, the frequency converter and the lubricating oil not cooled sufficiently or not possible to be cooled.

At present, as for a high-temperature air conditioning device, especially for a high-temperature refrigerating device or for a high-temperature heating pump device, new refrigeration solutions need be found to cool the motor, the frequency converter, and the lubricating oil, so as to achieve a stable and reliable operation of the device.

SUMMARY OF THE DISCLOSURE

In view of this, the present disclosure provides a high-temperature air conditioning device, so as to solve the problem that the frequency converter, the motor, the lubricating oil are insufficiently cooled or not possible to be cooled due to excessively high evaporation pressure. disclosure

In some embodiments, a high-temperature air conditioning device includes a compressor, a condenser, a throttling and cooling pipeline assembly, and an evaporator, which are connected in sequence to form a cycle; the throttling and cooling pipeline assembly includes throttle valves, a medium-pressure pipeline, a low-pressure pipeline, and a booster pipeline; the throttle valves are configured to enable a pressure of refrigerant in the low-pressure pipeline to be lower than a pressure of refrigerant in the medium-pressure pipeline; the medium-pressure pipeline and the low-pressure pipeline are connected in parallel; components to be cooled are disposed in the low-pressure pipeline; an outlet of the low-pressure pipeline is connected to the booster pipeline, and an outlet of the booster pipeline is connected to the evaporator; and a boosting device is arranged in the booster pipeline.

In one embodiment, the medium-pressure pipeline and the low-pressure pipeline are connected in parallel between the condenser and the evaporator;

throttle valves include a first throttle valve disposed in the medium-pressure pipeline, and a second throttle valve disposed in the low-pressure pipeline; and a pressure regulation capacity of the second throttle valve is greater than a pressure regulation capacity of the first throttle valve.

In one embodiment, throttle valves include a first throttle valve and a second throttle valve;

the medium-pressure pipeline and the low-pressure pipeline are connected in parallel, and the first throttle valve is arranged between the condenser, and an inlet of the medium-pressure pipeline and the low-pressure pipeline;

the second throttle valve is disposed in the low-pressure pipeline.

In one embodiment, the medium-pressure pipeline and the low-pressure pipeline are connected in parallel between the condenser and the evaporator;

throttle valves include a first throttle valve disposed in the medium-pressure pipeline, and a plurality of second throttle valves connected in series in the low-pressure pipeline; a pressure regulation capacity of the plurality of second throttle valves connected in series is greater than a pressure regulation capacity of the first throttle valve; the components to be cooled are connected in series downstream of the plurality of the second throttle valves.

In one embodiment, the pressure adjustment capability of each of the second throttle valves is identical.

In one embodiment, the number of the second throttle valves is two. In one embodiment, an inlet of the booster pipeline is connected to the outlet of the low-pressure pipeline; the boosting device is a booster pump.

In one embodiment, an inlet of the booster pipeline is connected to the condenser; the boosting device is an ejector; a high-pressure end of the ejector is connected to the condenser, and a low-pressure end of the ejector is connected to the evaporator; the outlet of the low-pressure pipeline is connected to an ejecting end of the ejector.

In some embodiments, in the high-temperature air conditioning device provided by the present disclosure, by changing the arrangement mode of the throttle valves, the pressure of the refrigerant in the low-pressure pipeline can be lower than the pressure of the refrigerant in the medium-pressure line, thereby ensuring that the refrigerant in the low-pressure pipeline, which is used for cooling the components, has a low pressure, and thereby solving the problem of insufficient cooling or impossible cooling due to excessively high evaporation pressure. The schemes are particularly suitable for the high-temperature refrigerating device or the high-temperature heating pump device.

InFIGS. 2 to 5of the schemes of the present disclosure,11indicates compressor,12indicates condenser,13indicates evaporator,14indicates first throttle valve,15indicates second throttle valve,16indicates components to be cooled;17indicates booster pump,18indicates ejector.

DETAILED DESCRIPTION OF EMBODIMENTS

The present disclosure discloses a high-temperature air conditioning device, which is capable of solving the problem that the frequency converter, the motor, the lubricating oil are insufficiently cooled or not possible to be cooled due to excessively high evaporation pressure.

Embodiments of the present disclosure will be described clearly and in more details with reference to the accompanying figures. In some embodiments, what described below are several but not all embodiments of the present

As for a high-temperature refrigerating device or for a high-temperature heating pump device, the refrigerant in the evaporator is medium-temperature and medium-pressure, so it is difficult to meet the requirements of cooling the frequency converter, the motor, and the lubricating oil only by employing one-stage isobaric throttling.

In view of this, one embodiment of the present disclosure provides a high-temperature air conditioning device, including a compressor11, a condenser12, a throttling and cooling pipeline assembly, and an evaporator13, all of which are connected in sequence to form a cycle.

The main improvement is that the throttling and cooling pipeline assembly includes throttle valves, a medium-pressure pipeline, a low-pressure pipeline, and a booster pipeline;

The throttle valves are configured to enable the pressure of the refrigerant in the low-pressure pipeline to be lower than the pressure of the refrigerant in the medium-pressure pipeline. In the prior art, the refrigerant flowing out of the condenser is divided into two streams, which are throttled to have the same pressure. In the present scheme, one stream of the refrigerant in the low-pressure pipeline is throttled to have a lower pressure, so as to meet the cooling requirements of components16to be cooled (such as the motor, the frequency converter, the lubricating oil and so on).

The medium-pressure pipeline and the low-pressure pipeline are connected in parallel; components16to be cooled are disposed in the low-pressure pipeline.

The outlet the low-pressure pipeline is connected to the booster pipeline, and the outlet of the booster pipeline is connected to the evaporator13; a boosting device is arranged in the booster pipeline. The refrigerant in the low-pressure pipeline is low-pressure, and at the same time, the refrigerant in the medium-pressure pipeline is medium-pressure, and the refrigerant in the evaporator13is medium-pressure, so the low-pressure refrigerant in the low-pressure pipeline cannot enter the evaporator13normally. In view of this, a booster pipeline is arranged to boost the pressure of the low-pressure refrigerant flowing out of the low-pressure pipeline, so that the low-pressure refrigerant is boosted to be the medium-pressure refrigerant, which can enter the evaporator13smoothly to cycle.

In one embodiment, in the high-temperature air conditioning device provided by the embodiment of the present disclosure, through changing the arrangement mode of the throttle valve, the pressure of the refrigerant in the low-pressure pipeline can be lower than the pressure of the refrigerant in the medium-pressure pipeline, which ensures that the refrigerant in the low-pressure pipeline, which is used to cool the components, is low-pressure, thereby solving the problem of insufficient cooling or non-cooling due to excessively high evaporation pressure in the prior art. This scheme is particularly applicable for the high-temperature refrigerating device or the high-temperature heating pump device.

This scheme provides two arrangement modes of the throttle valves and the pipelines, so as to obtain low-temperature and low-pressure refrigerant:

First, the medium-pressure pipeline and the low-pressure pipeline are connected in parallel between the condenser12and the evaporator13.

The throttle valves include a first throttle valve14disposed in the medium-pressure pipeline, and a second throttle valve15disposed in the low-pressure pipeline. The pressure regulation capacity of the second throttle valve15is greater than the pressure regulation capacity of the first throttle valve14. The components16to be cooled are connected in series downstream of the second throttle valve15. The structures of two embodiments are shown inFIG. 2andFIG. 3. That is to say, based on the structure of the air conditioning device in the prior art, two throttle valves with the same pressure regulation capacity in the two pipelines are improved to be one throttle valve with larger pressure regulation capacity, and the other throttle valve with smaller pressure regulation capacity, thereby achieving a medium-pressure pipeline (pipeline a) and a low-pressure pipeline (pipeline b) respectively. This mode makes a small change to the existing pipelines, and it is beneficial to realize and has simple structure.

Second, the throttle valves include the first throttle valve14and the second throttle valve15.

The medium-pressure pipeline and the low-pressure pipeline are connected in parallel, and the first throttle valve14is arranged between the condenser12and an inlet of medium-pressure pipeline and the low-pressure pipeline. The structures of two embodiments are shown inFIG. 2andFIG. 3.

The second throttle valve15is disposed in the low-pressure pipeline. That is to say, the high-temperature and high-pressure liquid refrigerant flowing out of the condenser12flows through the first throttle valve14and is throttled (in pipeline a), and becomes medium-temperature and medium-pressure refrigerant, which is further divided into two streams; one stream flows through the medium-pressure pipeline (pipeline b) and enters the evaporator13to refrigerate; the other stream flows through the low-pressure pipeline (pipeline c) and is throttled secondly by the second throttle valve15, and the throttled low-temperature and low-pressure refrigerant is drawn into and cools the components16to be cooled (such as the frequency converter, the motor, the lubricating oil and so on).

In addition, a fine regulation can be made on the base of the first arrangement mode of the first throttle:

the medium-pressure pipeline and the low-pressure pipeline are connected in parallel between the condenser12and the evaporator13, and the throttle valves include the first throttle valve14disposed in the medium-pressure pipeline, and a plurality of second throttle valves15connected in series in the low-pressure pipeline. The pressure regulation capacity of the plurality of second throttle valves15connected in series is greater than the pressure regulation capacity of the first throttle valve14; the components16to be cooled are connected in series downstream of the plurality of the second throttle valves15. That is to say, the throttle valve disposed in the low-pressure pipeline is replaced by a plurality of throttle valves connected in series, thus the refrigerant is throttled for many times by the plurality of throttle valves each with smaller pressure regulation capacity, thereby achieving the anticipated effects of replacing the single throttle valve with larger pressure regulation capability, and avoiding the drawbacks caused by throttling once and at a large scale.

In some embodiments, the pressure adjustment capability of each of the second throttle valves15is identical, and the entire throttling process is evenly divided into a plurality of segments; in addition, the same components are interchangeable, which facilitates assembly and maintenance.

In one embodiment provided by the present scheme, two second throttle valves15are provided, and a relatively simple structure can satisfy the cooling requirements of the components of the high-temperature refrigerating device or the high-temperature heating pump device.

Regarding the arrangement of the booster pipeline, two schemes are provided in this embodiment:

The first scheme: the inlet of the booster pipeline is connected to the outlet of the low-pressure pipeline, and the boosting device is a booster pump17. The structures of two embodiments are shown inFIG. 2andFIG. 4. Under the action of the booster pump17, the low-temperature and low-pressure refrigerant flowing out of the components16to be cooled becomes medium-pressure, thereby smoothly entering the evaporator13to cycle.

The second scheme: the inlet of the booster pipeline is connected to the condenser12; the boosting device is an ejector18; the high-pressure end of the ejector18is connected to the condenser12, and the low-pressure end of the ejector18is connected to the evaporator13; the outlet of the low-pressure pipeline is connected to the ejecting end of the ejector18. The structures of two embodiments are shown inFIG. 3andFIG. 5. The high-temperature and high-pressure liquid refrigerant supplied by the condenser12drives the ejector18to suck the low-temperature and low-pressure refrigerant flowing out of the components16to be cooled, then together the refrigerant enters the medium-temperature and medium-pressure evaporator13.

In some embodiments, the throttle valves and the booster pipeline are not limited to the above structures, and other embodiments may be adopted according to actual requirements; the pressure parameters of the throttle valves and the booster pipeline may also be determined according to specific conditions, and the pressure parameters are not limited herein.

Take the fourth embodiment ofFIG. 5as an example to further describe the scheme:

after the high-temperature and high-pressure liquid refrigerant flows out from the condenser12, it is divided into two streams in the pipeline a and in the pipeline b respectively.

1. The high-temperature and high-pressure liquid refrigerant in the pipeline a is throttled by the first throttle valve14firstly, to become the medium-temperature and medium-pressure refrigerant, which is further divided into two streams in the pipeline c and in the pipeline d; and, the refrigerant in the pipeline c flows into the evaporator13to refrigerate; the refrigerant flowing in the pipeline d is throttled by the second throttle valve15secondly, and the throttled low-temperature and low-pressure refrigerant is drawn into the components16to be cooled (such as the frequency converter, the motor, the lubricating oil and so on) to cool.

2. The high-temperature and high-pressure liquid refrigerant in the pipeline b drives the ejector18to suck the low-temperature and low-pressure refrigerant flowing out from the components14to be cooled, then together the refrigerant flows into the medium-temperature and medium-pressure evaporator13; the low-temperature and low-pressure gaseous refrigerant at the outlet of the evaporator13flows into the compressor11and is compressed to be high-temperature and high-pressure gaseous refrigerant, which flows into the condenser12; and the cycle repeats.

In summary, the embodiments of the present disclosure provide a high-temperature air conditioning device, and more particularly, a high-temperature refrigerating device or a high-temperature heating pump device. By changing the arrangement mode of the throttle valves, the pressure of the refrigerant in the low-pressure pipeline can be lower than the pressure of the refrigerant in the medium-pressure line, thereby ensuring that the refrigerant in the low-pressure pipeline, which is used for cooling the components, is low-pressure, thereby solving the problem of insufficient cooling or non-cooling of the frequency converter, the motor, the lubricating oil, etc. caused by excessively high evaporation pressure in the high-temperature refrigerating device or in the high-temperature heating pump device in the prior art. The system has a simple structure and runs reliably. In one embodiment, by throttling the high-temperature and high-pressure liquid refrigerant flowing out of the outlet of the condenser, the low-temperature and low-pressure refrigerant is obtained to cool the frequency converter, the motor, the lubricating oil, etc.; simultaneously, the high-temperature and high-pressure liquid refrigerant drives the ejector to suck the low-temperature and low-pressure refrigerant that has cooled the frequency converter, the motor, the lubricating oil, etc., and sends the low-temperature and low-pressure refrigerant to return to the medium-temperature and medium-pressure evaporator.

The various embodiments in the present description are described one by one, and each embodiment is described focusing on its differences from other embodiments, and the same or similar parts of various embodiments may be referred one another.