[0038] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not used to limit the present invention.
[0039] Such as figure 1 The outdoor unit shown includes an outdoor heat exchanger, the outdoor heat exchanger includes at least two heat exchange parts 1 arranged in parallel, and a flow adjustment mechanism is arranged between each heat exchange part 1 and the compressor 2, and the opening degree of the flow adjustment mechanism 2 is proportional to the degree of frosting on the heat exchange part, and the degree of frosting is used to adjust the opening degree of the flow adjustment mechanism 2 so that the high temperature and high pressure refrigerant entering the corresponding heat exchange part 1 Control the flow rate of the refrigerant so that the flow rate of the refrigerant matches the degree of frosting of the corresponding heat exchange unit 1, and performs precise defrosting, thereby reducing the defrosting time, improving the reliability of defrosting, reducing the defrosting time, and effectively reducing the heat pump The energy consumption of the system during defrosting.
[0040] The outdoor unit further includes a frosting degree detecting mechanism, the frosting degree detecting mechanism is arranged on the surfaces of at least two of the heat exchange parts, and the frosting degree detecting mechanism is electrically connected with the flow regulating mechanism, The frosting degree detection mechanism is used to detect the frosting degree, thereby adjusting the opening degree of the flow regulating mechanism.
[0041] The frosting degree detection mechanism includes a pressure sensor for detecting the airflow pressure drop of the heat exchange part.
[0042] The number of N pressure sensors set on each heat exchange part is N, and it is obtained according to the formula:
[0043]
[0044] Among them: B1 is the heat exchange area of the heat exchange part;
[0045] B is the set value.
[0046] The frosting degree detection mechanism includes a plurality of pressure sensors 3 for detecting the airflow pressure drop of the heat exchange part 1, and all the pressure sensors 3 are arranged on the corresponding outer windward surface of the heat exchange part 1.
[0047] All the pressure sensors 3 are evenly distributed, that is, all the pressure sensors 3 included in each frost degree detection mechanism are arranged on the heat exchange part of the frost degree detection mechanism, and the air flows through the outdoor heat exchanger The pressure drop at time is related to the degree of frosting. The pressure sensor 3 on the heat exchanger judges the degree of frosting by sensing the pressure. There is a relationship between the degree of frosting (D) and the pressure drop (P): D = y*P, (y≠0 is the correlation coefficient).
[0048] The outdoor unit also includes a control mechanism that extracts data from the frost degree detection mechanism and uses the data to control the opening degree of the corresponding flow adjustment mechanism 2, the data including the degree of frost , Pressure drop and other data, between opening (X) and frosting degree (D): X=q1*D (D1≤D 0), X=q2*D(D>D2).
[0049] Because the outdoor heat exchanger is frosted gradually from bottom to top when frosting, that is, the frosting degree of the lower part is greater than or far greater than the frosting degree of the upper part, so the two heat exchange parts are arranged in the vertical direction. Distributed up and down.
[0050] A heat pump system includes the above outdoor unit.
[0051] An air conditioner includes the above-mentioned outdoor unit.
[0052] A control method of the above outdoor unit includes:
[0053] S1, detecting the degree of frosting of each of the heat exchange parts 1, wherein the result of detecting the degree of frosting can be obtained by conversion according to the pressure drop detected by the pressure sensor 3;
[0054] S2. Adjust the opening degree of the flow adjustment mechanism in real time according to the degree of frosting.
[0055] The frost degree detection mechanism includes a plurality of pressure sensors 3, all the pressure sensors 3 are evenly distributed on the outer surface of the corresponding heat exchange part 1, and in step S1, the same heat exchange part 1 is detected The pressure drop data of all the pressure sensors 3 above obtains the degree of frosting, which may be the average value of the pressure drop data of all the pressure sensors 3 or the maximum value of all the pressure drop data.
[0056] Step S1 also includes that the detection period of the frost degree detection mechanism is T.
[0057] Step S1 also includes setting the frost temperature t0, detecting the ambient temperature t1 where the outdoor unit is located, comparing t1 and t0, and correcting the detection period according to the comparison result of t1 and t0.
[0058] Correcting the detection period of the frost degree detection mechanism according to the comparison result of t1 and t0 includes:
[0059] If t1>t0, the detection period T=k1t1;
[0060] If t1≤t0, the detection period T=k2t1;
[0061] Both k1 and k2 are constant values, and k1≠k2, which can reduce the time of defrosting, and can reduce the energy consumption of the compressor, and realize segmented precise defrosting.
[0062] The corresponding current of the pressure sensor 3 is extracted, the current is converted into an opening signal of the flow adjustment mechanism 2, and the opening signal is used to adjust the opening of the corresponding flow adjustment mechanism 2.
[0063] Set the basic heat exchange area B, determine the heat exchange area B1 of each heat exchange part, and determine the number N of pressure sensors according to the ratio of B and B1.
[0064] In determining the number of pressure sensors based on the ratio of B and B1, it also includes:
[0065] If B1≥B, then N=(B1/B)+2;
[0066] If B1
[0067] In step S2, it also includes setting the first frosting degree value D1 and the second frosting degree value D2, D2>D1>0, comparing D with D1 and D2, and adjusting the flow rate adjustment mechanism according to the comparison result 2 of the opening X.
[0068] In comparing D with D1 and D2, and adjusting the opening X of the flow adjustment mechanism 2 according to the comparison result, it also includes:
[0069] When D
[0070] When D1≤D
[0071] When D>D2, X=q2*D;
[0072] Where q1 and q2 are constants, and q1≠q2.
[0073] The above-mentioned embodiments only express several implementation modes of the present invention, and their description is more specific and detailed, but they should not be understood as a limitation to the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.
