Technical realization elements of air source heat pump system

Technical realization elements:

5. The purpose of this utility model is to provide an air source heat pump system, and to provide a new air source heat pump system that can slow down the frosting of the heat exchanger. The many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are described in detail below.

6. In order to achieve the above purpose, the present utility model provides the following technical solutions:

7. An air source heat pump system provided by the present utility model includes two or more outdoor heat exchangers, wherein the outdoor heat exchangers are divided into preheating heat exchangers and ordinary heat exchangers. The preheating heat exchange One side of the heat exchanger is connected to the indoor heat exchanger and the refrigerant discharged from the indoor heat exchanger can flow directly to the preheating heat exchanger without throttling, and the other side of the preheating heat exchanger is connected to the The ordinary heat exchanger is connected with a throttling device between the two, the preheating heat exchanger can heat the air passing through it, and the heated air can flow to the ordinary heat exchanger.

8. Further, the outdoor heat exchanger is divided into a windward side heat exchanger, an intermediate heat exchanger and a leeward side heat exchanger, and the intermediate heat exchanger is located at the windward side heat exchanger and the leeward side heat exchanger. Between the heat exchangers, the windward side heat exchanger and the leeward side heat exchanger are the ordinary heat exchangers, and the preheating heat exchanger is an intermediate heat exchanger.

9. Further, the number of the intermediate heat exchanger is one, and the intermediate heat exchanger, the windward side heat exchanger, and the leeward side heat exchanger are connected in sequence.

10. Further, the number of the intermediate heat exchanger is one, and the intermediate heat exchanger, the leeward side heat exchanger, and the windward side heat exchanger are connected in sequence.

11. Further, the number of the intermediate heat exchangers is more than two, each of the outdoor heat exchangers is connected in series, and the refrigerant discharged from the preheating heat exchanger is throttled and finally flows to the The common heat exchanger is the windward side heat exchanger or the leeward side heat exchanger or the intermediate heat exchanger.

12. Further, the number of the intermediate heat exchanger is one; or, the number of the intermediate heat exchanger is two or less

The upper air can pass through the windward side heat exchanger, each of the intermediate heat exchangers, and the leeward side heat exchanger in sequence.

13. Further, the throttling device is an expansion valve.

14. Further, a throttling device is provided between the indoor heat exchanger and the preheating heat exchanger.

15. Further, a fan is provided on one side of the leeward side heat exchanger or a fan is provided on one side of the windward side heat exchanger.

16. Further, the air source heat pump system further includes a compressor, a gas-liquid separator and a four-way valve.

17. In the air source heat pump system provided by the present invention, the heat pump system operates in a frost suppression heating mode, and the low-temperature and high-pressure refrigerant discharged from the indoor heat exchanger flows to the preheating heat exchanger (the preheating heat exchanger can be equivalent to " Condenser”). At the same time, a throttling device is added to the preheating heat exchanger and the ordinary heat exchanger. The throttling device can be an expansion valve. The refrigerant discharged from the preheating heat exchanger is throttled by the throttling device to form a low temperature The low-pressure refrigerant flows to the ordinary heat exchanger (the ordinary heat exchanger at this time is the evaporator). When the air passes through the preheating heat exchanger, the preheating heat exchanger can heat the air passing through it, and the heated air can flow to the ordinary Heat exchanger (the ordinary heat exchanger here can be the heat exchanger that is relatively easy to frost among all outdoor heat exchangers). In this way, because the temperature of the air blown through the ordinary heat exchanger increases, the relative humidity decreases, which can be It is beneficial to slow down the rate of frosting of the heat exchanger.

18. The preferred technical solution of the present invention can at least produce the following technical effects:

19. Because when the outdoor heat exchanger has three rows, the frosting rate of the outdoor heat exchangers of different rows is different. Usually, the leeward side heat exchanger is frosted first, followed by the middle part of the heat exchanger, facing the wind. The side heat exchanger is frosted last. Therefore, the present invention sets the preheating heat exchanger as an intermediate heat exchanger, which is beneficial to blow air to the leeward side heat exchanger when passing through the preheating heat exchanger, so as to slow down the frosting rate of the leeward side heat exchanger to reduce the overall The frosting rate of the heat exchanger;

20. The general heat exchanger to which the refrigerant discharged from the preheating heat exchanger flows last is the leeward side heat exchanger. Since the temperature of the refrigerant at the outlet of the leeward side heat exchanger is relatively high, it is beneficial to slow down the leeward side heat exchanger. Frosting rate.

Description of the drawings

21. In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appendix in the following description The drawings are merely some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

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