CN217274535U

CN217274535U - Refrigerant compression device, air conditioner outdoor unit and air conditioner

Info

Publication number: CN217274535U
Application number: CN202220076282.3U
Authority: CN
Inventors: 金子孝
Original assignee: Ningbo Aux Electric Co Ltd; Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-08-23
Anticipated expiration: 2032-01-07

Abstract

The utility model relates to a refrigerant compressor arrangement, air condensing units and air conditioner belongs to air conditioning technology field, aims at solving the technical problem that current refrigerant compressor arrangement is difficult for the oil return. The refrigerant compression device comprises a compressor and an oil separator, wherein an air outlet of the compressor is connected with an inlet of the oil separator through a first pipeline, the oil separator is provided with a first oil outlet, the first oil outlet is communicated with an air suction pipe of the compressor through a second pipeline, and the second pipeline is provided with a master control valve. The utility model discloses a refrigerant compressor arrangement, air condensing units and air conditioner when the exhaust pressure fluctuation that utilizes the compressor and spontaneously return the oil that separates to the scheme of compressor can't carry out the oil return automatically in the oil separator, open the active control valve, and make the separation oil of oil separator flow to the breathing pipe of compressor in from the second pipeline.

Description

Refrigerant compression device, air conditioner outdoor unit and air conditioner

Technical Field

The utility model relates to an air conditioning technology field particularly, relates to a refrigerant compressor arrangement, air condensing units and air conditioner.

Background

In an air conditioner, in order to prevent liquid in a refrigerant from flowing outward when an outdoor unit discharges air, an oil separator is provided in an exhaust pipe, and oil separated by the oil separator (hereinafter, referred to as separated oil) is returned to a compressor. However, when the compressor mounted on the air conditioner is a high-pressure compressor having a compressor body pressure equal to the discharge pressure, the pressure in the oil separator is lower than the compressor body pressure due to the discharge pipe pressure loss. Therefore, if only an oil return pipe is connected between the oil separator and the compressor body, the separated oil cannot be returned to the compressor.

In order to solve the above problems, the following solutions are adopted in the background art:

(1) as shown in fig. 1, in the background art 1, the oil separator and the suction pipe 80 of the compressor 10 are connected by the return oil pipe provided with the capillary 99, and for example, the capillary 99 having an inner diameter of 1.0mm and a length of 700mm can be used for the air conditioner of 10 hp. With the above configuration, the separated liquid refrigerant flows from the oil separator 20 to the suction pipe 80 of the compressor 10 having a low pressure, and then returns to the compressor 10. However, in this method, the gaseous portion of the discharge refrigerant also flows to the suction pipe 80 through the return pipe. This reduces the flow rate of the refrigerant flowing into the indoor unit, and eventually deteriorates cooling or heating capacity. Meanwhile, when a high-temperature exhaust refrigerant is mixed into the intake refrigerant, the intake temperature increases, which causes an increase in the exhaust temperature, and eventually, the reliability of the compressor 10 is also degraded.

(2) As shown in fig. 2, in the background art 2, the oil separator 20 and the compressor 10 are connected by a return pipe provided with a pump 98, and for example, for a 10hp air conditioner, a pump with a flow rate of 0.1L/min can be used. The separated separation oil is then raised by pump 98 to flow toward compressor 10. However, the above method requires an additional pump 98, which causes a problem of an increase in the cost of the air conditioner. Further, the power consumption of the pump increases, resulting in an increase in cooling power consumption and heating power consumption.

(3) As shown in fig. 3, in the prior art 3, a first check valve 51, an oil reservoir 30, and a second check valve 52 are provided in an oil return pipe connecting the oil separator 20 and the compressor 10 from the oil separator 20 side. When the air conditioner performs a cooling operation or a heating operation, the discharge pressure of the compressor 10 repeatedly varies up and down due to a change in room temperature, a change in set air volume of the indoor unit, a change in the number of operating indoor units in a multi-air scene, and the like.

At this time, when the discharge pressure rises, the first check valve 51 opens, the second check valve 52 closes, and the oil separated by the oil separator moves to the oil reservoir and is stored. When the discharge pressure is decreased, the first check valve is closed 51 and then the second check valve 52 is opened and the separated oil in the oil reservoir 30 moves toward the compressor 10.

However, in this method, the discharge pressure increases when the compressor 10 is started, and the oil in the oil reservoir 30 moves to the compressor when the discharge pressure decreases. The separated oil separated by the oil separator 20 is stored in the oil reservoir 30, and since the pressure of the oil reservoir 30 is always lower than the discharge pressure of the compressor 10 at this stage, the oil separated by the oil separator 20 cannot return to the compressor 10, which may result in an insufficient amount of oil in the compressor 10.

Further, when the indoor load fluctuation is small, for example, at noon, the exhaust pressure change becomes small. The oil in the oil separator cannot return to the compressor and may result in insufficient oil in the compressor 10.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a refrigerant compressor arrangement to solve the difficult technical problem who returns oil of current refrigerant compressor arrangement's oil separator.

The utility model provides a refrigerant compression device, including compressor and oil separator, the gas outlet of compressor is through first tube coupling the entry of oil separator, oil separator has first oil export, first oil export through the second pipeline with the breathing pipe intercommunication of compressor, be equipped with the active control valve on the second pipeline.

By providing the active control valve in the second pipe connecting the oil separator and the suction pipe of the compressor, when the oil separated in the oil separator is spontaneously returned to the compressor by the fluctuation of the discharge pressure of the compressor and the oil cannot be automatically returned, the active control valve is opened to allow the oil separated in the oil separator to flow from the second pipe to the suction pipe of the compressor. As long as the compressor is in an open state, the pressure of the air suction pipe of the compressor is certainly and obviously lower than the exhaust pressure of the compressor, so that the separated oil in the oil separator flows back to the compressor, the oil quantity in the compressor is supplemented in time, and the long-term oil shortage of the compressor is avoided.

In a preferred technical scheme, the oil separator further comprises a third pipeline, the oil separator is further provided with a second oil outlet, the second oil outlet is connected with an oil reservoir through the third pipeline, a first one-way valve is arranged on the third pipeline, the oil reservoir is connected with an oil return port of the compressor through a fourth pipeline, and the first one-way valve can only conduct the oil separator to the oil reservoir in a one-way mode.

Through setting up the third pipeline and being connected with the oil reservoir to set up first check valve on the third pipeline, can be when the pressure of the exhaust pressure of compressor appears rising, the pressure of oil separator is greater than the pressure of oil reservoir, retrieves oil to the oil reservoir. And as long as the pressure is in a corresponding relation, the separated oil can flow into the oil reservoir without detection and control links, and the action reliability is high. In addition, even if the discharge pressure of the compressor is reduced and the pressure in the oil separator is lower than the pressure in the oil reservoir, the separated oil in the oil reservoir is not returned to the oil separator due to the one-way conduction action of the first check valve.

In a preferred technical scheme, a second one-way valve is arranged on the fourth pipeline, and the second one-way valve can only conduct from the oil reservoir to the compressor in a one-way mode.

By providing the second check valve on the fourth line, when the discharge pressure of the compressor decreases, the pressure of the oil reservoir is higher than the discharge pressure of the compressor, and the separated oil in the oil reservoir spontaneously flows back to the compressor. And as long as the pressure has the corresponding relation, the separated oil can flow into the compressor without detection and control links, and the action reliability is high.

In a preferred technical scheme, a temperature sensor is arranged on the fourth pipeline and is positioned between the second one-way valve and an oil return port of the compressor.

Through setting up temperature sensor, can detect the separation oil temperature of returning oil to the compressor from the oil reservoir, can in time learn the temperature variation of oil reservoir to control the active control valve and carry out corresponding action, thereby can utilize the relative relation between the separation oil temperature of oil reservoir and the exhaust temperature of compressor, judge whether separation oil in the oil reservoir is in the flow condition.

In a preferred technical solution, the control system further comprises a controller, the active control valve is an electromagnetic valve, the active control valve is electrically connected with the controller, and the active control valve is used for disconnecting or connecting the second pipeline under the control of the controller.

The electromagnetic valve electrically connected with the controller is used for disconnecting or connecting the second pipeline under the control of the controller, so that the reaction speed is favorably improved, and more accurate control is realized.

In a preferred technical scheme, the controller with the temperature sensor electricity is connected, the controller is used for acquireing the oil return temperature that temperature sensor detected.

The controller is electrically connected with the temperature sensor to acquire the oil return temperature of the oil reservoir detected by the temperature sensor, so that the oil storage duration of the oil reservoir can be reflected, and the corresponding active control valve can be controlled to operate.

In a preferred technical scheme, the active control valve is used for conducting the second pipeline when the temperature difference between the oil return temperature and the exhaust temperature of the compressor is greater than or equal to a first preset temperature difference within a first preset time period; and/or the active control valve is used for conducting the first pipeline when the fluctuation value of the discharge pressure of the compressor is smaller than a preset fluctuation value in a first preset time period.

When the difference between the return oil temperature and the exhaust temperature of the compressor is larger in the first preset duration, it is indicated that the separated oil of the oil separator is stored in the oil reservoir for a longer time, the separated oil dissipates more heat to the environment, so that the temperature is lower, it is indicated that the compressor works for a longer time in a state with relatively less oil, and at this time, the active control valve can conduct the third pipeline under the control of the controller. Because the pressure of the suction port of the compressor is far less than the exhaust pressure of the compressor and the pressure difference between the suction port and the exhaust pressure is large, separated oil is rapidly supplemented into the compressor to ensure that the working state of the compressor is normal.

And/or, the exhaust pressure fluctuation value of the compressor can be detected, if the exhaust pressure fluctuation value of the compressor is smaller, the pressure change between the compressor and the oil reservoir is not easy to utilize, spontaneous oil separation backflow is realized through the first one-way valve and the second one-way valve, and the active control valve can be actively opened at the moment to return oil, so that the working state of the compressor is ensured to be normal.

In a preferred technical scheme, a capillary tube is further arranged on the second pipeline.

Through setting up the capillary, can play certain throttle effect to avoid the separation oil high temperature that flows back to the compressor breathing pipe and promote the exhaust temperature of compressor, the compressor reliability descends.

A second object of the present invention is to provide an outdoor unit of an air conditioner to solve the technical problem of the difficult oil return of the oil separator of the refrigerant compression device of the existing outdoor unit of an air conditioner.

The utility model provides an air condensing units, including foretell refrigerant compressor arrangement.

By arranging the refrigerant compression device in the air conditioner outdoor unit, the air conditioner outdoor unit has all the advantages of the refrigerant compression device, and the description is omitted.

A third object of the present invention is to provide an air conditioner to solve the technical problem of the difficult oil return of refrigerant compressor of the outdoor unit of the air conditioner.

The utility model provides an air conditioner, including foretell air condensing units.

By arranging the air conditioner outdoor unit in the air conditioner, the air conditioner has all the advantages of the air conditioner outdoor unit, and the description is omitted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of background art 1 in the background art of the present invention;

fig. 2 is a schematic structural diagram of background art 2 in the background art of the present invention;

fig. 3 is a schematic structural diagram of background art 3 in the background art of the present invention;

fig. 4 is a schematic structural view of a refrigerant compression device according to an embodiment of the present invention;

fig. 5 is a schematic view of the refrigerant compression device in a state where the separated oil flows from the oil separator to the oil reservoir;

fig. 6 is a schematic view of the refrigerant compression device in a state where the separated oil flows from the oil reservoir to the oil separator;

fig. 7 is a schematic view of a working process of the refrigerant compressing device;

fig. 8 is a schematic view of another operation flow of the refrigerant compression device.

Description of reference numerals:

10-a compressor; 20-an oil separator; 30-an oil reservoir; 40-an active control valve; 51-a first one-way valve; 52-a second one-way valve; 60-a temperature sensor; 71-a first conduit; 72-a second conduit; 73-a third line; 74-fourth line; 80-suction pipe; 98-a pump; 99-capillary.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 4 is a schematic structural view of a refrigerant compression device according to an embodiment of the present invention. As shown in fig. 4, the refrigerant compressing apparatus according to the present embodiment includes a compressor 10 and an oil separator 20, an air outlet of the compressor 10 is connected to an inlet of the oil separator 20 through a first pipeline 71, the oil separator 20 has a first oil outlet, the first oil outlet is communicated with a suction pipe 80 of the compressor 10 through a second pipeline 72, and the second pipeline 72 is provided with an active control valve 40.

Specifically, the active control valve 40 may include an electrically or manually or hydraulically controlled stop valve, a two-position two-way directional valve, or a valve that can be opened and closed, such as an electronic expansion valve, and although its main function is to adjust the opening degree, when the opening degree is adjusted to 0, the valve is considered to block the pipeline in which it is located. Alternatively, when the four-way valve is in a state where a certain line can be cut off or conducted without causing a change in the other lines during a state change, that is, when one four-way valve is used as a two-position two-way valve, the four-way valve may also be used as the active control valve 40. The valve, such as a check valve, in which whether the check valve conducts from the inlet end to the outlet end is determined only by the relative pressure state of the external pipe, does not belong to the above-described active control valve 40.

By providing the active control valve 40 in the second pipe line 72 connecting the oil separator 20 and the suction pipe 80 of the compressor 10, when the oil return cannot be automatically performed in a scheme of spontaneously returning the oil separated in the oil separator 20 to the compressor 10 by using the fluctuation of the discharge pressure of the compressor 10, the active control valve 40 is opened to flow the oil separated in the oil separator 20 from the second pipe line 72 into the suction pipe 80 of the compressor 10. As long as the compressor 10 is in an open state, the pressure of the suction pipe 80 of the compressor 10 is inevitably significantly lower than the discharge pressure of the compressor 10, so that the separated oil in the oil separator 20 flows back into the compressor 10, the oil quantity in the compressor 10 is supplemented in time, and the long-term oil shortage of the compressor 10 is avoided.

As shown in fig. 4, the oil separator 20 preferably further includes a third pipe 73, the oil separator 20 further includes a second oil outlet connected to the oil reservoir 30 through the third pipe 73, the third pipe 73 is provided with a first check valve 51, the oil reservoir 30 is connected to an oil return port of the compressor 10 through a fourth pipe 74, and the first check valve 51 can only be communicated in one direction from the oil separator 20 to the oil reservoir 30.

By providing the third line 73 in connection with the oil reservoir 30 and providing the first check valve 51 on the third line 73, it is possible to recover oil to the oil reservoir 30 when the pressure of the discharge gas of the compressor 10 rises, the pressure of the oil separator 20 being greater than the pressure of the oil reservoir 30. Moreover, as long as the pressure is in a corresponding relationship, the separated oil can flow into the oil reservoir 30 without detection and control links, and the action reliability is high. In this state, as shown in fig. 5, even if the discharge pressure of the compressor 10 is reduced and the pressure in the oil separator 20 is lower than the pressure in the oil reservoir 30, the separated oil in the oil reservoir 30 is not returned to the oil separator 20 by the one-way conduction action of the first check valve 51.

As shown in fig. 4, the fourth line 74 is preferably provided with the second check valve 52, and the second check valve 52 can only conduct one-way flow from the oil reservoir 30 to the compressor 10.

By providing the second check valve 52 on the fourth line 74, when the discharge pressure of the compressor 10 is decreased, the pressure of the oil reservoir 30 is higher than the discharge pressure of the compressor 10, and the separated oil in the oil reservoir 30 spontaneously flows back to the compressor 10, as shown in fig. 6. Moreover, as long as the pressure has the corresponding relationship, the separated oil can flow into the compressor 10 without passing through detection and control links, and the operation reliability is high.

With the arrangement in which the first check valve 51 and the second check valve 52 are respectively provided at both ends of the oil reservoir 30, the spontaneous return flow of the separated oil from the separator can be achieved by utilizing the discharge pressure fluctuation of the compressor 10. Compared with a scheme of offsetting pressure through height, the occupied space can be reduced; power consumption may be reduced compared to a scheme using a pump for pumping; the reliability of compressor 10 is improved over a solution in which only capillary tube 99 is used to return oil to suction pipe 80 of compressor 10.

As shown in fig. 4, a temperature sensor 60 is preferably disposed on the fourth line 74, and the temperature sensor 60 is located between the second check valve 52 and the oil return of the compressor 10.

Specifically, the temperature sensor 60 may be an electronic temperature sensor 60, and the pressure information of the fourth line 74 is transmitted to the controller as an electric signal, and the controller determines the pressure information based on the temperature signal and operates the operation mechanism. Alternatively, a non-electronic temperature gauge may be used to visually indicate the temperature level in the fourth line 74 to the operator.

By providing the temperature sensor 60, the temperature of the separated oil returning from the oil reservoir 30 to the compressor 10 can be detected, and the temperature change of the oil reservoir 30 can be known in time, so that the active control valve 40 can be controlled to perform corresponding operations, and thus, whether the separated oil in the oil reservoir 30 is in a flowing state or not can be determined by using the relative relationship between the temperature of the separated oil in the oil reservoir 30 and the discharge temperature of the compressor 10.

As shown in fig. 4, it is preferable that a controller (not shown) is further included, the active control valve 40 is a solenoid valve, the active control valve 40 is electrically connected to the controller, and the active control valve 40 is used for disconnecting or connecting the second pipeline 72 under the control of the controller.

The second pipeline 72 is disconnected or connected under the control of the controller by using the electromagnetic valve electrically connected with the controller, so that the reaction speed is improved, and more accurate control is realized.

In other implementations, no controller may be provided and, accordingly, the active control valve 40 may be a manual valve. The operator observes the temperature table, compares it with a preset value according to the indication on the temperature table, and opens the active control valve 40 when the difference from the preset value is large, thereby allowing the separated oil of the oil separator 20 to flow to the suction pipe 80 of the compressor 10 through the second pipe 72, or opens the active control valve 40 for a certain period of time at the start-up stage of the compressor 10 or at a period of time when the discharge pressure of the compressor 10 may fluctuate little. Although not as fast as electronically controlled, it is an alternative when the volume of the accumulator 30 is large and the amount of oil allowed in the compressor 10 is reduced to a large extent, without rapidly switching the communication state of the first pipe 71 in a short time.

As shown in fig. 4, preferably, the controller is electrically connected to the temperature sensor 60, and the controller is configured to obtain the oil return temperature detected by the temperature sensor 60.

By electrically connecting the controller with the temperature sensor 60 to obtain the oil return temperature of the oil reservoir 30 detected by the temperature sensor 60, the oil storage period of the oil reservoir 30 can be reflected so as to control the corresponding active control valve 40 to operate.

As shown in fig. 4, the active control valve 40 is preferably configured to conduct the second pipeline 72 when the temperature difference between the oil return temperature and the discharge temperature of the compressor 10 is greater than or equal to a first preset temperature difference within a first preset time period; and/or the active control valve 40 is used for conducting the first pipeline 71 when the fluctuation value of the discharge pressure of the compressor 10 in the first preset time period is smaller than the preset fluctuation value.

When the separated oil from the oil separator 20 is stored in the oil reservoir 30 for a longer period of time, the separated oil dissipates more heat into the environment and is therefore cooler. That is, the difference between the oil return temperature and the discharge temperature of the compressor 10 is relatively large in the first preset time period, which indicates that the compressor 10 works for a relatively long time in a state with a relatively small oil amount, and at this time, the active control valve 40 may conduct the third pipeline 73 under the control of the controller. Since the pressure at the suction port of the compressor 10 is much lower than the discharge pressure of the compressor 10 and the pressure difference between the two is large, the separated oil is rapidly supplemented to the compressor 10 to ensure that the working state of the compressor 10 is normal.

And/or, the discharge pressure fluctuation value of the compressor 10 can be detected, if the discharge pressure fluctuation value of the compressor 10 is small, it is difficult to utilize the pressure changes of the compressor 10 and the oil reservoir 30, the spontaneous separated oil backflow is realized through the first check valve 51 and the second check valve 52, and at this time, the active control valve 40 can be actively opened to return oil, so as to ensure the normal working state of the compressor 10.

As shown in fig. 4, a capillary tube 99 is preferably provided on the second pipe 72.

The capillary tube 99 is provided to perform a certain throttling function, thereby preventing the temperature of the separated oil flowing back to the suction pipe 80 of the compressor 10 from being too high to raise the discharge temperature of the compressor 10, and reducing the reliability of the compressor 10.

As shown in fig. 7, the operation principle of the embodiment in the case where no temperature sensor is provided is:

taking an outdoor unit with power of 10hp as an example, the oil separated by the oil separator is about 0.1L/min. In a scenario where the separated oil is returned only through the third and fourth pipelines, if the pressure difference between the inlet side and the outlet side of the first check valve and the second check valve is 0.01MPa, the flow coefficient of the check valve needs to be 0.02 or more.

The flow coefficient can be calculated according to the following formula:

flow coefficient is 0.022 × oil flow [ L/min ] × { oil specific gravity/pressure difference [ MPa ] } × 0.5

Assuming that the separated oil in the oil reservoir can move 1 back to the compressor body every 5min, a capacity of 0.5L or more is required.

In the scenario where the oil is separated by the return flow of the second line only, the capillary dimensions are about 1.0mm in inside diameter and 700mm in length, depending on empirical values of the test results.

The solenoid valve is opened for a second preset duration Tr from the start of the compressor. In this embodiment, generally, the duration from the start of the compressor to the discharge pressure is not longer than 20 minutes, and the second preset time period Tr may be about 20 minutes. If the opening time of the electromagnetic valve reaches 20min, the electromagnetic valve can be closed. The separated oil can flow back to the compressor through the path of the first check valve, the oil reservoir and the second check valve.

In addition, the solenoid valve may be opened for a second preset time period Tr when the compressor is stopped and then started after a certain time period. In this case, generally, the time required from the stop of the compressor to the uniform pressure of each refrigerant line is about 30 min. If the compressor is stopped and then started again, and the time is more than 30 minutes, the electromagnetic valve can be opened, so that the separation oil flows back to the suction port of the compressor from the capillary tube.

As shown in fig. 8, the operation principle of the embodiment in the case of having the temperature sensor is:

the last shutdown of the compressor is the start of the process.

After the compressor is stopped, starting timing by using a stop time Tcs, judging whether the compressor starts to operate, and starting timing the temperature measuring time Tr if the compressor starts to operate; if the compressor is not starting to operate, the shutdown duration Tcs continues to be timed.

After the temperature measuring time Tr begins to be counted, the exhaust temperature Td of the compressor is detected (detection of the exhaust temperature of the compressor, which belongs to the prior art and is not repeated in the application), the temperature Tor of the temperature sensor is detected, and whether the difference value of the temperature sensor and the temperature Tor exceeds a first preset temperature difference is judged. It should be noted that, since the separated oil in the fourth pipeline detected by the temperature sensor is the separated oil which has stayed in the oil reservoir or passed through the oil reservoir for a certain period of time from the discharge port of the compressor, the temperature Tor of the temperature sensor should be less than the discharge temperature Td of the compressor. The difference between the two is the absolute value of the difference between the two temperature values.

The first predetermined temperature difference may be set to 10 ℃. Tr may be restarted when the difference is less than the first predetermined temperature difference. If the difference between the first temperature difference and the second temperature difference is greater than the first preset temperature difference, it is determined whether Tr has reached a first preset time period, for example, the first preset time period may be 5 minutes. If Tr does not reach the first preset time, Tor and Td can be continuously detected, and the difference value of the Tor and the Td is judged. If Tr reaches a first preset time period, the solenoid valve is opened.

And then detecting the exhaust temperature Td and the separated oil temperature Tor of the fourth pipeline by using a temperature sensor, and judging whether the difference value of the exhaust temperature Td and the separated oil temperature Tor exceeds a first preset temperature difference. If so, the solenoid valve is caused to continue to maintain the open state and continue to detect. If the difference between the two is less than the first preset temperature difference, which indicates that the separated oil in the oil reservoir probably begins to flow back to the compressor through the fourth pipeline, the electromagnetic valve is closed, and the process is ended.

In addition, even if the discharge pressure of the compressor does not fluctuate so much and the oil from the oil separator to the compressor cannot be returned by the flow paths of the first check valve, the oil reservoir, and the second check valve at a time when the indoor load fluctuation is small, such as at the middle of the day, the oil separated can be returned to the suction port of the compressor by the opened electromagnetic valve and capillary tube, and the shortage of the oil amount in the compressor can be prevented.

To sum up, the utility model has the advantages of it is following:

1. the phenomenon that the exhaust refrigerant moves to the compressor suction pipe through the oil return pipe can not be caused when the separated oil of the oil separator returns to the compressor body. Therefore, the cooling capacity or the heating capacity is not reduced due to the decrease of the indoor unit refrigerant flow rate.

2. The phenomenon that the high-temperature exhaust refrigerant is mixed into the air suction refrigerant when the separated oil of the oil separator returns to the compressor body can not occur. Therefore, the exhaust temperature is not increased, and the reliability of the compressor is not reduced.

3. The increase of cooling power consumption and は heating power consumption can be prevented without increasing the manufacturing cost of the air conditioner by using a pump.

4. When the compressor is started, even if the oil can not move from the oil separator to the compressor through the oil reservoir, the oil can move from the oil separator to the compressor through the electromagnetic valve. Therefore, the problem of insufficient oil amount at the start stage of the compressor can be prevented.

5. In normal state, the pressure fluctuation of the exhaust gas of the compressor can be normally utilized, and the oil is returned to the compressor through the first check valve, the oil reservoir and the second check valve. The second oil return pipe is not used when not necessary, so that the problem of the reliability reduction of the compressor caused by the reduction of the cooling capacity or the heating capacity or the increase of the exhaust temperature can be prevented.

The utility model also provides an embodiment, the air condensing units that this embodiment provided, including foretell refrigerant compressor arrangement.

The utility model also provides an embodiment, the air conditioner that this embodiment provided, including foretell air condensing units.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The refrigerant compression device is characterized by comprising a compressor (10) and an oil separator (20), wherein an air outlet of the compressor (10) is connected with an inlet of the oil separator (20) through a first pipeline (71), the oil separator (20) is provided with a first oil outlet, the first oil outlet is communicated with an air suction pipe (80) of the compressor (10) through a second pipeline (72), and the second pipeline (72) is provided with a main control valve (40).

2. The refrigerant compression device according to claim 1, further comprising a third pipeline (73), wherein the oil separator (20) further has a second oil outlet, the second oil outlet is connected to an oil reservoir (30) through the third pipeline (73), a first check valve (51) is disposed on the third pipeline (73), the oil reservoir (30) is connected to an oil return port of the compressor (10) through a fourth pipeline (74), and the first check valve (51) can only conduct from the oil separator (20) to the oil reservoir (30) in one direction.

3. The refrigerant compression device as claimed in claim 2, wherein a second check valve (52) is provided on the fourth pipe (74), and the second check valve (52) is only capable of conducting from the oil reservoir (30) to the compressor (10) in one direction.

4. A refrigerant compression device as claimed in claim 3, wherein a temperature sensor (60) is provided on the fourth line (74), the temperature sensor (60) being located between the second check valve (52) and an oil return of the compressor (10).

5. The refrigerant compressing apparatus as claimed in claim 4, further comprising a controller, wherein the active control valve (40) is a solenoid valve, the active control valve (40) is electrically connected to the controller, and the active control valve (40) is used for disconnecting or connecting the second pipeline (72) under the control of the controller.

6. The refrigerant compressing device as claimed in claim 5, wherein the controller is electrically connected to the temperature sensor (60), and the controller is configured to obtain an oil return temperature detected by the temperature sensor (60).

7. The refrigerant compression device as claimed in claim 6, wherein the active control valve (40) is configured to conduct the second pipeline (72) when a temperature difference between the oil return temperature and the discharge temperature of the compressor (10) within a first predetermined time period is greater than or equal to a first predetermined temperature difference; and/or the active control valve (40) is used for conducting the second pipeline (72) when the fluctuation value of the discharge pressure of the compressor (10) in the first preset time period is smaller than the preset fluctuation value.

8. Refrigerant compression arrangement according to any of claims 1-7, characterised in that a capillary tube (99) is provided in the second line (72).

9. An outdoor unit of an air conditioner, comprising the refrigerant compression device as recited in any one of claims 1 to 8.

10. An air conditioner comprising the outdoor unit of claim 9.