CN-121993844-A - Air conditioner

CN121993844ACN 121993844 ACN121993844 ACN 121993844ACN-121993844-A

Abstract

The invention discloses an air conditioner, wherein a refrigerant radiator of the air conditioner comprises a single-phase refrigerant radiating pipeline and a two-phase refrigerant radiating pipeline, an inlet of the two-phase refrigerant radiating pipeline is connected between an outdoor heat exchanger and an indoor heat exchanger through an electronic expansion valve, the controller is configured to control the electronic expansion valve to be opened when the current temperature exceeds the opening temperature, namely, when the temperature of the refrigerant radiator or a power module is higher, the two-phase refrigerant radiating pipeline is further added on the basis of radiating of the single-phase refrigerant radiating pipeline so as to radiate through the two-phase refrigerant radiating pipeline, the radiating capacity is improved, and the temperature of the power module is ensured to be within a reasonable range, otherwise, the electronic expansion valve is closed, namely, when the temperature of the refrigerant radiator or the power module is lower, the two-phase refrigerant radiating pipeline is closed, and radiating is only carried out through a one-way refrigerant radiating pipeline, so that the condensation risk is reduced, and the safety is improved.

Inventors

XIN PENGFEI
HOU ZHIHUI
WANG JIANGNAN

Assignees

青岛海信日立空调系统有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. An air conditioner, comprising: the compressor, the four-way valve, the outdoor heat exchanger, the throttling element and the indoor heat exchanger are sequentially connected; The refrigerant radiator is used for cooling the power module; the temperature detection module is used for detecting the current temperature of the refrigerant radiator or the power module and is characterized in that, The refrigerant radiator includes: the single-phase refrigerant heat dissipation pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger; the inlet of the two-phase refrigerant heat dissipation pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger through the electronic expansion valve; And a controller configured to control the electronic expansion valve to open when the current temperature exceeds the opening temperature, and to close the electronic expansion valve otherwise.
2. An air conditioner according to claim 1, wherein the air conditioner comprises: the current detection module is used for detecting the current of the power module; The controller is configured to determine an initial opening of the electronic expansion valve based on the power module current.
3. The air conditioner of claim 2, wherein the controller is configured to obtain a maximum current of the power module, and determine the initial opening of the electronic expansion valve according to a ratio of the power module current to the maximum current of the power module.
4. The air conditioner of claim 3, wherein the controller is configured to determine a correction factor based on an upper operating temperature limit of the power module and a current temperature, and to determine an initial opening of the electronic expansion valve based on a ratio of the power module current to a maximum current of the power module and the correction factor; And/or the controller is configured to determine an initial opening adjustment coefficient, and determine the initial opening of the electronic expansion valve according to the ratio of the current of the power module to the maximum current of the power module and the initial opening adjustment coefficient, wherein the initial opening adjustment coefficient is between 0.5 and 1.
5. The air conditioner of claim 1, wherein the controller is configured to control the electronic expansion valve to be closed within a compressor start-up set time, and to determine whether the electronic expansion valve is opened based on the current temperature after the compressor start-up set time.
6. An air conditioner according to claim 1, wherein the air conditioner comprises: The environment temperature detection module is used for detecting the environment temperature; the controller is configured to determine the on-temperature from the ambient temperature.
7. The air conditioner according to any one of claims 1 to 6, wherein the controller is configured with at least three temperature sections having a temperature between an ambient temperature and an upper limit temperature of the power module, a first temperature section, a second temperature section, and a third temperature section, the temperature of the first temperature section being lower than the temperature of the second temperature section, the temperature of the second temperature section being lower than the temperature of the third temperature section; The controller is configured to: When the current temperature is in a first temperature interval, reducing the opening of the electronic expansion valve; When the current temperature is in a second temperature interval, the opening of the electronic expansion valve is kept unchanged; And when the current temperature is in a third temperature interval, increasing the opening of the electronic expansion valve.
8. The air conditioner of claim 7, wherein the controller is configured with a fourth temperature interval between the first temperature interval and the second temperature interval, and a fifth temperature interval between the second temperature interval and the third temperature interval; The controller is configured to: When the current temperature is in a fourth temperature interval, reducing the opening of the electronic expansion valve when the temperature of the refrigerant radiator is reduced, otherwise, keeping the opening of the electronic expansion valve unchanged; When the current temperature is in a fifth temperature interval, increasing the opening of the electronic expansion valve when the temperature of the refrigerant radiator is increased, otherwise, keeping the opening of the electronic expansion valve unchanged; The reduction amplitude of the electronic expansion valve in the first temperature interval is larger than that of the electronic expansion valve in the fourth temperature interval, and the increase amplitude of the electronic expansion valve in the fifth temperature interval is smaller than that of the electronic expansion valve in the third temperature interval.
9. The air conditioner of claim 8, wherein the controller is configured to control the electronic expansion valve at set time intervals, and to reduce the control time intervals of the electronic expansion valve when the current temperature is within a specific range of an upper operating limit temperature of the power module or an ambient temperature.
10. The air conditioner as set forth in any one of claims 1 to 6, 8 to 9, wherein the refrigerant radiator includes a heat conductive member in contact with the power module; The single-phase refrigerant heat dissipation pipeline and the two-phase refrigerant heat dissipation pipeline are connected with the heat conduction piece; Or the single-phase refrigerant heat dissipation pipeline is connected with the heat conduction piece, and the two-phase refrigerant heat dissipation pipeline comprises a cavity arranged in the heat conduction piece.

Description

Air conditioner Technical Field The invention relates to the technical field of air conditioning systems, in particular to an air conditioner with a refrigerant heat dissipation function. Background The air conditioner comprises an electric control box, wherein a power module in the electric control box can generate heat in the operation process, and the stability of the power module is reduced along with the temperature rise of the power module, so that the power module needs to be cooled. The refrigerant heat dissipation is widely applied due to the high heat dissipation efficiency, small volume, low noise and convenient installation and manufacture. However, the existing cooling medium heat dissipation mode still has the following problems that as the temperature of the power module increases, only the main pipeline single-phase cooling medium is used for heat dissipation, the temperature of the power module cannot be guaranteed to be in a reasonable range, and if the auxiliary pipeline two-phase cooling medium is used for heat dissipation, the cooling medium temperature is too low, condensation of the power module is caused, and the safety problem is caused. The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The invention provides an air conditioner, which solves the technical problems that the existing air conditioner can not meet the heat dissipation requirement by utilizing a single-phase refrigerant and is easy to condense by utilizing a two-phase refrigerant for heat dissipation. In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme: an air conditioner, comprising: the compressor, the four-way valve, the outdoor heat exchanger, the throttling element and the indoor heat exchanger are sequentially connected; The refrigerant radiator is used for cooling the power module; the temperature detection module is used for detecting the current temperature of the refrigerant radiator or the power module; The refrigerant radiator includes: the single-phase refrigerant heat dissipation pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger; the inlet of the two-phase refrigerant heat dissipation pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger through the electronic expansion valve; And a controller configured to control the electronic expansion valve to open when the current temperature exceeds the opening temperature, and to close the electronic expansion valve otherwise. The refrigerant radiator of the air conditioner comprises a single-phase refrigerant radiating pipeline and a two-phase refrigerant radiating pipeline, wherein an inlet of the two-phase refrigerant radiating pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger through the electronic expansion valve, the controller is configured to control the electronic expansion valve to be opened when the current temperature exceeds the opening temperature, namely, when the temperature of the refrigerant radiator or the power module is higher, the two-phase refrigerant radiating pipeline is further added on the basis of radiating of the single-phase refrigerant radiating pipeline so as to radiate through the two-phase refrigerant radiating pipeline, the radiating capacity is improved, and the temperature of the power module is ensured to be within a reasonable range, otherwise, the electronic expansion valve is closed, namely, when the temperature of the refrigerant radiator or the power module is lower, the two-phase refrigerant radiating pipeline is closed, and only the one-way refrigerant radiating pipeline is used for radiating, so that the condensation risk is reduced, and the safety is improved. In some embodiments, the air conditioner includes: the current detection module is used for detecting the current of the power module; The controller is configured to determine an initial opening of the electronic expansion valve based on the power module current. The technical scheme has the advantages that the power module current can timely and accurately reflect the heat to be generated by the power module, so that the initial opening of the electronic expansion valve determined by the power module current can more timely control the temperature of the power module. In some embodiments, the controller is configured to obtain a maximum current of the power module, and determine an initial opening of the electronic expansion valve according to a ratio of the power module current to the maximum current of the power module. The technical scheme has the advantages that the power module has different requirements on temperature due to different specifications of the power module,