Air conditioning systems and air conditioners

Abstract

The present invention discloses an air conditioning system and an air conditioner. The air conditioning system includes: an indoor heat exchanger; an outdoor heat exchanger connected to the indoor heat exchanger via a refrigerant pipe to form a refrigerant circuit; and a vibration exciter disposed within the refrigerant pipe. When the air conditioning system enters defrost mode, the vibration exciter generates vibration excitation in the refrigerant circuit to offset refrigerant pulsation. The air conditioning system of the present invention connects the vibration exciter in series with the refrigerant circuit. When the air conditioning system enters defrost mode from heating mode, the vibration exciter generates vibration excitation in a phase opposite to that of the refrigerant pulsation. This vibration excitation eliminates refrigerant pulsation, reduces noise generated when the refrigerant switches flow direction, and thus reduces noise when the air conditioning system enters defrost mode.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system and an air conditioner. Background Art

[0002] When an air conditioner is heating, the indoor temperature is high and the outdoor temperature is low. As the temperature of the outdoor heat exchanger drops, condensation forms on the fins. Furthermore, when the outdoor heat exchanger temperature drops below a certain level, frost and even ice will begin to form on the fins, blocking the heat exchange channels and resulting in poor or even no heating. Therefore, conventional air conditioners typically utilize the compressor's exhaust temperature for defrosting. When defrosting begins, the air conditioner's four-way valve reverses direction, allowing the outdoor heat exchanger to release heat, thereby defrosting the outdoor heat exchanger.

[0003] However, in existing air conditioners, when the outdoor unit of the air conditioner is in heating and defrosting mode, the refrigerant pulsates and impacts the refrigerant pipe wall when the four-way valve is switched, resulting in very loud noise from the outdoor unit. Summary of the Invention

[0004] The main purpose of the present invention is to provide an air-conditioning system, aiming to solve the technical problem of how to reduce the noise generated when the air-conditioning system enters the defrost mode.

[0005] To achieve the above-mentioned object, the air conditioning system proposed by the present invention comprises:

[0006] Indoor heat exchanger;

[0007] an outdoor heat exchanger connected to the indoor heat exchanger via a refrigerant pipe to form a refrigerant circuit;

[0008] The vibration exciter is arranged in the refrigerant pipe, so that when the air-conditioning system enters the defrost mode, the vibration exciter generates vibration excitation to offset the refrigerant pulsation.

[0009] Optionally, the refrigerant pipe includes a main pipe connecting the indoor heat exchanger and the outdoor heat exchanger, and a branch pipe connected in parallel with the main pipe, and the vibration exciter is provided on the branch pipe.

[0010] Optionally, the air-conditioning system further includes a control valve provided on the diversion pipe.

[0011] Optionally, when the air-conditioning system enters the defrost mode, the control valve is located upstream of the vibration exciter.

[0012] Optionally, the air-conditioning system further comprises a pressure pulsation sensor provided on the refrigerant pipe, and the pressure pulsation sensor is linked with the vibration exciter to trigger the vibration exciter to generate vibration excitation when refrigerant pulsation is detected.

[0013] Optionally, the pressure pulsation sensor and the vibration exciter are linked through a controller, the pressure pulsation sensor is used to detect the frequency of refrigerant pulsation, and the controller is used to control the vibration exciter to generate vibration excitation with opposite phase and corresponding frequency according to the refrigerant pulsation frequency.

[0014] Optionally, when the air-conditioning system enters the defrost mode, the pressure pulsation sensor is located upstream of the vibration exciter.

[0015] Optionally, the air-conditioning system further includes an electronic expansion valve provided on the refrigerant pipe, and the vibration exciter is provided adjacent to the electronic expansion valve.

[0016] Optionally, when the air-conditioning system enters the defrost mode, the vibration exciter is located upstream of the electronic expansion valve.

[0017] The present invention also proposes an air conditioner, including an air conditioning system, which includes: an indoor heat exchanger; an outdoor heat exchanger connected to the indoor heat exchanger through a refrigerant pipe to form a refrigerant circuit; a vibration exciter, arranged in the refrigerant pipe, so that when the air conditioning system enters the defrost mode, the vibration exciter generates vibration excitation to offset the refrigerant pulsation.

[0018] The air-conditioning system of the present invention connects a vibration exciter in series on the refrigerant circuit so that when the air-conditioning system enters the defrost mode from the heating mode, the vibration exciter generates vibration excitation in the opposite phase to the refrigerant pulsation. The vibration excitation can eliminate the refrigerant pulsation to reduce the noise generated when the refrigerant flow direction is switched, thereby reducing the noise when the air-conditioning system enters the defrost mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the refrigerant flow direction of a conventional air-conditioning system in heating mode;

[0021] Figure 2 Schematic diagram of the refrigerant flow direction of the air-conditioning system of the present invention in the defrost mode;

[0022] Figure 3 Schematic diagram of the sound pressure level curve when the air-conditioning system enters the defrost mode in the prior art;

[0023] Figure 4Schematic diagram of the sound pressure level curve when the air-conditioning system of the present invention enters the defrost mode.

[0024] Description of Figure Numbers:

[0025] Label name Label name Label name 10 Indoor heat exchanger 20 Outdoor heat exchanger 30 Refrigerant pipe 40 Vibration exciter 31 Shunt pipe 50 control valves 60 Pressure pulsation sensor 70 Controller 80 Electronic expansion valve 90 compressor

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present invention provides an air conditioning system.

[0030] In the embodiment of the present invention, Figure 2 As shown, the air-conditioning system includes: an indoor heat exchanger 10; an outdoor heat exchanger 20, which is connected to the indoor heat exchanger 10 through a refrigerant pipe 30 to form a refrigerant circuit; a vibration exciter 40, which is arranged in the refrigerant pipe 30, so that when the air-conditioning system enters the defrost mode, the vibration exciter 40 generates vibration excitation to offset the refrigerant pulsation.

[0031] In this embodiment, the air conditioner includes an indoor air conditioner and an outdoor air conditioner, an indoor heat exchanger 10 is provided in the indoor air conditioner, an outdoor heat exchanger 20 and a vibration exciter 40 are provided in the outdoor air conditioner, and the air conditioning system may further include a compressor 90 and a four-way valve (not shown) provided in the outdoor air conditioner, wherein the compressor 90 is used to increase the low-pressure refrigerant to a high-pressure refrigerant, and the four-way valve is used to adjust the flow direction of the refrigerant. The air conditioning system has a heating mode and a defrosting mode. In the heating mode, Figure 1As shown, the exhaust port of compressor 90 is connected to the indoor heat exchanger 10 via a four-way valve, and the return air port of compressor 90 is connected to the outdoor heat exchanger 20 via a four-way valve. The indoor heat exchanger 10 and the outdoor heat exchanger 20 are connected, thus forming a refrigerant heating circuit. In heating mode, the high-temperature refrigerant flowing out of compressor 90 flows along the refrigerant pipe 30 to the indoor heat exchanger 10. The refrigerant flowing through the indoor unit heat exchanger exchanges heat with the indoor environment to achieve heating of the indoor environment. After heating, the low-temperature refrigerant flows to the outdoor heat exchanger 20 and then flows through the outdoor heat exchanger 20 to the return air port of compressor 90.

[0032] In defrost mode, Figure 2 As shown, the four-way valve switches the exhaust port of compressor 90 to connect with the outdoor heat exchanger 20 and the return port of compressor 90 to connect with the indoor heat exchanger 10, thereby forming a defrost circuit for the refrigerant. The high-temperature refrigerant flowing out of compressor 90 flows along the refrigerant pipe 30 to the outdoor heat exchanger 20, where its high temperature melts the frost on the outdoor heat exchanger 20. After defrosting, the refrigerant flows along the defrost circuit to the return port of compressor 90. The vibration exciter 40 is a device that generates mechanical vibration using electric, electro-hydraulic, piezoelectric, or other principles. Its principle is to input an excitation signal into a coil placed in a magnetic field to drive the workbench connected to the coil. The refrigerant pulsates during the flow switching process. The vibration exciter 40 generates vibration excitation in phase opposite to the refrigerant pulsation, thereby offsetting the refrigerant pulsation and reducing the noise caused by the refrigerant pulsation impacting the refrigerant pipe 30. The vibration exciter 40 can be connected in series or in parallel with the defrost circuit, without limitation. The only requirement is that the refrigerant can flow through the vibration exciter 40 even in defrost mode. The vibration excitation frequency generated by the vibration exciter 40 can be the same as or different from the refrigerant pulsation frequency, without limitation. The only requirement is that the phases are opposite.

[0033] like Figure 3 and Figure 4 As shown, Figure 3 This is a curve diagram of sound pressure changes when the air-conditioning system enters the defrost mode in the prior art. Figure 4 This is a graph showing the sound pressure changes when the air conditioning system of the present invention enters defrost mode. It can be seen that within 5 seconds of entering defrost mode, the noise level of the prior art air conditioning system reaches a maximum of 68 decibels, while the noise level of the air conditioning system of the present invention reaches a maximum of only 53 decibels. This comparison shows that the air conditioning system of the present invention can effectively reduce the noise level when entering defrost mode.

[0034] The air-conditioning system of the present invention connects a vibration exciter 40 in series on the refrigerant circuit so that when the air-conditioning system enters the defrost mode from the heating mode, the vibration exciter 40 generates vibration excitation in the opposite phase to the refrigerant pulsation. The vibration excitation can eliminate the refrigerant pulsation to reduce the noise generated when the refrigerant flow direction is switched, thereby reducing the noise when the air-conditioning system enters the defrost mode.

[0035] like Figure 2 As shown, the refrigerant pipe 30 includes a main flow pipe connecting the indoor heat exchanger 10 and the outdoor heat exchanger 20, and a branch pipe 31 connected in parallel with the main flow pipe, and the vibration exciter 40 is provided in the branch pipe 31. In this embodiment, the vibration exciter 40 is connected in parallel to the refrigerant circuit through the branch pipe 31. Of course, the refrigerant will continue to flow to the main flow pipe after flowing through the vibration exciter 40 along the branch pipe 31. The vibration exciter 40 will cause a certain obstruction to the flow of the refrigerant. Therefore, connecting the vibration exciter 40 in parallel with the refrigerant circuit can enable the refrigerant to flow mainly through the main flow pipe in the heating mode or the cooling mode, so as to reduce the influence of the vibration exciter 40 on the refrigerant in the heating mode or the cooling mode.

[0036] The vibration excitation generated by the vibration actuator 40 is transmitted to the main flow pipe along the refrigerant flow direction. This counteracts the refrigerant pulsation within the main flow pipe at the intersection of the main flow pipe and the branch pipe 31, effectively reducing noise generated by the main flow pipe. It should be understood that the vibration actuator 40 does not activate in heating or cooling mode and only activates when switching from heating mode to defrost mode to minimize the impact on normal temperature control mode.

[0037] like Figure 2 As shown, the air conditioning system further includes a control valve 50 disposed on the shunt pipe 31. In this embodiment, the control valve 50 is used to control the on / off state of the shunt pipe 31. In heating mode or cooling mode, the control valve 50 blocks the shunt pipe 31. In defrost mode, the control valve 50 opens the shunt pipe 31. This prevents the refrigerant from flowing through the shunt pipe 31 in heating mode or cooling mode, thereby reducing the impact of the shunt pipe 31 on the air conditioning system in normal temperature control mode. The control valve 50 can be configured as a solenoid valve and linked to a four-way valve. When the air conditioning system switches from heating mode to defrost mode via the four-way valve, the control valve 50 is linked to open the shunt pipe 31, allowing the vibration exciter 40 to more promptly eliminate refrigerant pulsation. Specifically, when the air-conditioning system enters the defrost mode, the control valve 50 is located upstream of the vibration exciter 40; that is, the control valve 50 is located upstream of the vibration exciter 40 in the defrost mode. Since the vibration excitation generated by the vibration exciter 40 is transmitted along the flow direction of the refrigerant, the control valve 50 is arranged upstream of the vibration exciter 40. This can avoid the control valve 50 affecting the vibration excitation in transmission, resulting in the timing of the vibration excitation being transmitted to the main pipe being delayed, thereby further improving the timeliness of noise reduction.

[0038] like Figure 2As shown, the air-conditioning system further includes a pressure pulsation sensor 60 provided on the refrigerant pipe 30, and the pressure pulsation sensor is linked to the vibration exciter 40 so as to trigger the vibration exciter 40 to vibrate when refrigerant pulsation is detected. In this embodiment, the pressure pulsation sensor 60 is used to detect refrigerant pulsation and trigger the vibration exciter 40 in a timely manner. The pressure pulsation sensor 60 and the vibration exciter 40 can be directly electrically connected and linked, or can be linked through the controller 70, which is not limited here. The vibration exciter 40 stops running in the temperature control mode of the air-conditioning system and will only start running when triggered by the pressure pulsation sensor 60. This can improve the effective utilization rate of the vibration exciter 40 and improve the accuracy of the noise reduction timing.

[0039] like Figure 2 As shown, the pressure pulsation sensor 60 and the vibration exciter 40 are linked via the controller 70. The pressure pulsation sensor 60 is used to detect the frequency of the refrigerant pulsation, and the controller 70 is used to control the vibration exciter 40 to generate vibration excitation with a phase opposite and a corresponding frequency according to the refrigerant pulsation frequency. In this embodiment, after detecting the refrigerant pulsation, the pressure pulsation sensor 60 outputs a frequency signal of the refrigerant pulsation to the controller 70. The controller 70 outputs an operating signal of a corresponding frequency to the vibration exciter 40 according to the frequency signal of the refrigerant pulsation. As a result, the vibration exciter 40 can generate vibration excitation with a phase opposite to the refrigerant pulsation and a frequency identical to the refrigerant pulsation, thereby accurately offsetting the refrigerant pulsation, thereby ensuring both noise reduction and preventing its own vibration frequency from being too high.

[0040] Specifically, when the air-conditioning system enters the defrost mode, the pressure pulsation sensor 60 is located upstream of the vibration exciter 40; that is, the pressure pulsation sensor 60 is located upstream of the vibration exciter 40 in the defrost mode, so that the refrigerant pulsation can be detected by the pressure pulsation sensor 60 before the refrigerant flows through the vibration exciter 40, and the vibration exciter 40 is triggered to run in advance, avoiding the operation lag of the vibration exciter 40, so as to improve the accuracy of the timing of eliminating the refrigerant pulsation. Combined with the above-mentioned embodiment in which the vibration exciter 40 is connected in parallel to the main pipe, the pressure pulsation sensor 60 can be connected in series to the main pipe, so that the refrigerant pulsation can be detected before the refrigerant flows through the main pipe part in parallel with the branch pipe 31, so that the vibration exciter 40 can be turned on in advance and the vibration excitation is transmitted to the intersection of the branch pipe 31 and the main pipe in time.

[0041] like Figure 2As shown, the air conditioning system further includes an electronic expansion valve 80 disposed on the refrigerant pipe 30, and the vibration exciter 40 is disposed adjacent to the electronic expansion valve 80. In this embodiment, the electronic expansion valve 80 is used to regulate the refrigerant flow rate. Testing and comparison have shown that when the air conditioning system switches from heating mode to defrost mode, refrigerant pulsation has a significant impact on the electronic expansion valve 80, resulting in a relatively high noise level at the electronic expansion valve 80. Therefore, locating the vibration exciter 40 adjacent to the electronic expansion valve 80 allows the vibration excitation generated by the vibration exciter 40 to be transmitted more quickly and completely to the electronic expansion valve 80, thereby quickly and effectively reducing the noise level at the electronic expansion valve 80. Specifically, when the air-conditioning system enters the defrost mode, the vibration exciter 40 is located upstream of the electronic expansion valve 80; that is, the vibration exciter 40 is located upstream of the electronic expansion valve 80 in the defrost mode. Thus, the vibration excitation generated by the vibration exciter 40 can be effectively transmitted to the electronic expansion valve 80, or before the refrigerant flows through the electronic expansion valve 80, the refrigerant pulsation has been offset by the vibration excitation, thereby effectively applying the vibration excitation to the noise source of the air-conditioning system in the defrost mode, thereby improving the accuracy of noise reduction.

[0042] The present invention also proposes an air conditioner, which includes an air conditioning system. The specific structure of the air conditioning system refers to the above-mentioned embodiment. Since this air conditioner adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0043] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Indoor heat exchanger; an outdoor heat exchanger connected to the indoor heat exchanger via a refrigerant pipe to form a refrigerant circuit; a vibration exciter disposed in the refrigerant pipe, so that when the air-conditioning system enters the defrost mode, the vibration exciter generates vibration excitation to offset refrigerant pulsation; the refrigerant pipe includes a main flow pipe connecting the indoor heat exchanger and the outdoor heat exchanger, and a branch pipe connected in parallel with the main flow pipe, the vibration exciter is disposed in the branch pipe and connected in parallel with the refrigerant circuit; A control valve is provided on the diversion pipe, and the control valve is a solenoid valve.

2. The air conditioning system according to claim 1, wherein: When the air-conditioning system enters the defrost mode, the control valve is located upstream of the vibration exciter.

3. The air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system further includes a pressure pulsation sensor provided on the refrigerant pipe, and the pressure pulsation sensor is linked to the vibration exciter to trigger the vibration exciter to generate vibration excitation when refrigerant pulsation is detected.

4. The air conditioning system according to claim 3, wherein: The pressure pulsation sensor is linked to the vibration exciter through a controller. The pressure pulsation sensor is used to detect the frequency of refrigerant pulsation, and the controller is used to control the vibration exciter to generate vibration excitation with opposite phase and corresponding frequency according to the refrigerant pulsation frequency.

5. The air conditioning system according to claim 3, wherein: When the air-conditioning system enters the defrost mode, the pressure pulsation sensor is located upstream of the vibration exciter.

6. The air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system further includes an electronic expansion valve provided on the refrigerant pipe, and the vibration exciter is provided adjacent to the electronic expansion valve.

7. The air conditioning system according to claim 6, wherein: When the air-conditioning system enters the defrost mode, the vibration exciter is located upstream of the electronic expansion valve.

8. An air conditioner, characterized in that: Comprising the air conditioning system according to any one of claims 1 to 7.

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