Control method for heat pump air conditioner valve cut-off protection

Abstract

The invention discloses a control method for cut-off protection of a valve of a heat pump air conditioner, which comprises the following steps: after the heat pump air conditioner is started, refrigerant circulation abnormity judgment is respectively carried out according to electrification of the heat pump air conditioner in different modes, and refrigerant circulation cut-off protection treatment is carried out when the refrigerant circulation is abnormal. According to the method, comprehensive judgment is carried out by collecting the outdoor environment temperature, the indoor environment temperature, the inner pipe temperature and the compressor torque value, so that whether refrigerant circulation in the unit is abnormal or not is accurately judged, refrigerant circulation cut-off protection processing is carried out when the refrigerant circulation is abnormal, and damage, explosion and other hazards caused by the abnormal refrigerant circulation are avoided.

Description

Technical Field

[0001] The invention relates to a control method for cut-off protection of a heat pump air-conditioning valve. Background Art

[0002] During the after-sales installation process or after maintenance of the air conditioner, the large and small valves of the outdoor unit may not be closed and opened. Once the system is running without opening the valves, the refrigerant cannot circulate normally, which will cause the compressor to idle or be overloaded, which may cause the compressor to explode or burn due to excessive temperature, affecting the system and personal safety and leading to after-sales complaints. However, there is no logic for judging and controlling this situation in the existing air conditioning program, and there is no component in the heat pump air conditioning structure design to prevent this phenomenon. Summary of the invention

[0003] In view of the above problems, the present invention provides a control method for heat pump air conditioning valve cut-off protection, which effectively solves the problems pointed out in the background technology.

[0004] The technical solution adopted by the present invention is:

[0005] A control method for heat pump air conditioner valve cut-off protection, after the heat pump air conditioner is turned on, refrigerant circulation abnormality is judged according to the heat pump air conditioner being powered on in different modes, and refrigerant circulation cut-off protection processing is performed when the refrigerant circulation is abnormal;

[0006] The method for judging abnormality of refrigerant circulation is as follows:

[0007] 1) When the power is turned on for the first time in cooling or dehumidification mode, the compressor is turned on and runs continuously until A minutes. If the following conditions are met at the same time, it is judged as a refrigerant circulation abnormality and enters the refrigerant circulation cutoff protection process:

[0008] 11) Outdoor ambient temperature range at startup: 10℃≤T 外环 ≤43℃;

[0009] 12) Indoor ambient temperature range at startup: 10℃≤T 内环 ≤43℃;

[0010] 13) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃;

[0011] 14) Compressor operating frequency: The frequency at the A minute is ≥40Hz;

[0012] 15) Inner tube temperature change: T 内管 -minT 内管 ≤2℃;

[0013] 16) The temperature difference between the indoor ambient temperature and the inner tube temperature at minute A: T 内环A -T 内管A ≤3℃;

[0014] 17) The compressor starts with a continuous torque value Te>Z for A minutes;

[0015] Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at the start-up time, minT 内管 T is the minimum value of the inner tube temperature during the continuous operation for A minutes. 内环A is the indoor ambient temperature at minute A, T 内管A is the internal tube temperature at minute A, Te is the compressor torque value, A and Z are constants;

[0016] 2) When the power is turned on for the first time in heating mode, the compressor is turned on and runs continuously until C minutes. If the following conditions are met at the same time, it is determined that the refrigerant circulation is abnormal and the refrigerant circulation cut-off protection process is entered:

[0017] 21) Outdoor ambient temperature range at startup: 4℃≤T 外环 ≤24℃;

[0018] 22) Indoor ambient temperature range at startup: 4℃≤T 内环 ≤24℃;

[0019] 23) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃;

[0020] 24) Compressor operating frequency: The frequency at the C minute is ≥50Hz;

[0021] 25) Temperature change of inner tube: maxT 内管 -T 内管 ≤2℃;

[0022] 26) The temperature difference between the indoor ambient temperature and the inner tube temperature at C minute: T 内管C -T 内环C ≤3℃;

[0023] 27) The compressor starts for C minutes continuously and the torque value Te>Y;

[0024] Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at startup, maxT 内管T is the maximum value of the inner tube temperature during the continuous operation for C minutes. 内环C is the indoor ambient temperature at minute A, T 内管C is the internal tube temperature at C minute, Te is the compressor torque value, C and Y are constants;

[0025] The refrigerant cycle cut-off protection process is as follows:

[0026] 1) Control the compressor to shut down and increase the number of refrigerant circulation cut-off protection times in the system by 1. The compressor will automatically resume normal operation after being shut down for 3 minutes, clear the fault information, and re-enter the refrigerant circulation abnormality judgment, and will no longer judge the "temperature difference range between the internal pipe temperature and the indoor ambient temperature at the time of startup".

[0027] 2) When the refrigerant cycle cut-off protection times reaches 3 times, the compressor cannot automatically resume operation, and the fault continues to be sent and displayed.

[0028] The present invention makes a comprehensive judgment by collecting the outdoor ambient temperature, indoor ambient temperature, inner tube temperature and compressor torque value, so as to accurately judge whether the refrigerant circulation in the unit is abnormal, and performs refrigerant circulation cutoff protection processing when it is abnormal, so as to avoid damage to the compressor, explosion and other hazards caused by the abnormal refrigerant circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a working principle diagram of the present invention. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Example 1

[0038] like Figure 1As shown, a control method for heat pump air conditioner valve cut-off protection, after the heat pump air conditioner is turned on, if the protection function flag is 0, the heat pump air conditioner operates normally and does not perform refrigerant circulation abnormality judgment, if the protection function flag is 1, the refrigerant circulation abnormality judgment is performed according to the heat pump air conditioner being powered on in different modes, and the refrigerant circulation cut-off protection processing is performed when the refrigerant circulation is abnormal;

[0039] The method for judging abnormality of refrigerant circulation is as follows:

[0040] 1) When the power is turned on for the first time in cooling or dehumidification mode, the compressor is turned on and runs continuously until A minutes. If the following conditions are met at the same time, it is judged as a refrigerant circulation abnormality and enters the refrigerant circulation cutoff protection process:

[0041] 11) Outdoor ambient temperature range at startup: 10℃≤T 外环 ≤43℃;

[0042] 12) Indoor ambient temperature range at startup: 10℃≤T 内环 ≤43℃;

[0043] 13) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃;

[0044] 14) Compressor operating frequency: The frequency at the A minute is ≥40Hz;

[0045] 15) Inner tube temperature change: T 内管 -minT 内管 ≤2℃;

[0046] 16) The temperature difference between the indoor ambient temperature and the inner tube temperature at minute A: T 内环A -T 内管A ≤3℃;

[0047] 17) The compressor starts with a continuous torque value Te>Z for A minutes;

[0048] Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at the start-up time, minT 内管 T is the minimum value of the inner tube temperature during the continuous operation for A minutes. 内环A is the indoor ambient temperature at minute A, T 内管A is the internal pipe temperature at minute A, Te is the compressor torque value, A and Z are constants. In cooling and dehumidification modes, Te≤Z when the compressor is operating normally;

[0049] 2) When the power is turned on for the first time in heating mode, the compressor is turned on and runs continuously until C minutes. If the following conditions are met at the same time, it is determined that the refrigerant circulation is abnormal and the refrigerant circulation cut-off protection process is entered:

[0050] 21) Outdoor ambient temperature range at startup: 4℃≤T 外环 ≤24℃;

[0051] 22) Indoor ambient temperature range at startup: 4℃≤T 内环 ≤24℃;

[0052] 23) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃;

[0053] 24) Compressor operating frequency: The frequency at the C minute is ≥50Hz;

[0054] 25) Temperature change of inner tube: maxT 内管 -T 内管 ≤2℃;

[0055] 26) The temperature difference between the indoor ambient temperature and the inner tube temperature at C minute: T 内管C -T 内环C ≤3℃;

[0056] 27) The compressor starts for C minutes continuously and the torque value Te>Y;

[0057] Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at startup, maxT 内管 T is the maximum value of the inner tube temperature during the continuous operation for C minutes. 内环C is the indoor ambient temperature at minute A, T 内管C is the internal pipe temperature at C minute, Te is the compressor torque value, C and Y are constants, and in heating mode, when the compressor operates normally, Te≤Y;

[0058] The refrigerant cycle cut-off protection process is as follows:

[0059] 1) Control the compressor to shut down and increase the number of refrigerant circulation cut-off protection times in the system by 1. The compressor will automatically resume normal operation after being shut down for 3 minutes, clear the fault information, and re-enter the refrigerant circulation abnormality judgment, and will no longer judge the "temperature difference range between the internal pipe temperature and the indoor ambient temperature at the time of startup".

[0060] 2) When the refrigerant cycle cut-off protection times reaches 3 times, the compressor cannot automatically resume operation, and the fault continues to be sent and displayed.

[0061] After the heat pump air conditioner is powered on again, the refrigerant circulation cut-off protection times stored in the system will be cleared, and the refrigerant circulation abnormality judgment will be re-performed.

[0062] The heat pump air conditioner must complete a complete test cycle after being powered on for the first time.

[0063] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A control method for heat pump air conditioning valve cut-off protection, characterized in that: After the heat pump air conditioner is turned on, the refrigerant circulation abnormality is judged according to the heat pump air conditioner being powered on in different modes, and the refrigerant circulation cut-off protection processing is performed when the refrigerant circulation is abnormal; The method for judging abnormality of refrigerant circulation is as follows: 1) When the power is turned on for the first time in cooling or dehumidification mode, the compressor is turned on and runs continuously until A minutes. If the following conditions are met at the same time, it is judged as a refrigerant circulation abnormality and enters the refrigerant circulation cutoff protection process: 11) Outdoor ambient temperature range at startup: 10℃≤T 外环 ≤43℃; 12) Indoor ambient temperature range at startup: 10℃≤T 内环 ≤43℃; 13) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃; 14) Compressor operating frequency: The frequency at the A minute is ≥40Hz; 15) Temperature change of inner tube: T 内管 -minT 内管 ≤2℃; 16) The temperature difference between the indoor ambient temperature and the inner tube temperature at minute A: T 内环A -T 内管A ≤3℃; 17) The compressor starts with a continuous torque value Te>Z for A minutes; Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at the start-up time, minT 内管 T is the minimum value of the inner tube temperature during the continuous operation for A minutes. 内环A is the indoor ambient temperature at minute A, T 内管A is the internal tube temperature at minute A, Te is the compressor torque value, A and Z are constants; 2) When the power is turned on for the first time in heating mode, the compressor is turned on and runs continuously until C minutes. If the following conditions are met at the same time, it is determined that the refrigerant circulation is abnormal and the refrigerant circulation cut-off protection process is entered: 21) Outdoor ambient temperature range at startup: 4℃≤T 外环 ≤24℃; 22) Indoor ambient temperature range at startup: 4℃≤T 内环 ≤24℃; 23) The temperature difference between the inner tube temperature and the indoor ambient temperature at the time of startup: T 内管 -T 内环 ≤2℃; 24) Compressor operating frequency: The frequency at the C minute is ≥50Hz; 25) Temperature change of inner tube: maxT 内管 -T 内管 ≤2℃; 26) The temperature difference between the indoor ambient temperature and the inner tube temperature at C minute: T 内管C -T 内环C ≤3℃; 27) The compressor starts for C minutes continuously and the torque value Te>Y; Among them, T 外环 is the outdoor ambient temperature at the time of startup, T 内环 is the indoor ambient temperature at the time of startup, T 内管 is the internal tube temperature at startup, maxT 内管 T is the maximum value of the inner tube temperature during the continuous operation for C minutes. 内环C is the indoor ambient temperature at minute A, T 内管C is the internal tube temperature at C minute, Te is the compressor torque value, C and Y are constants; The refrigerant cycle cut-off protection process is as follows: 1) Control the compressor to shut down and increase the number of refrigerant circulation cut-off protection times in the system by 1. The compressor will automatically resume normal operation after being shut down for 3 minutes, clear the fault information, and re-enter the refrigerant circulation abnormality judgment, and will no longer judge the "temperature difference range between the internal pipe temperature and the indoor ambient temperature at the time of startup". 2) When the refrigerant cycle cut-off protection times reaches 3 times, the compressor cannot automatically resume operation, and the fault continues to be sent and displayed.

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