Control method for starting heating by air source heat pump

Abstract

The present application relates to a kind of air source heat pump heating control method when starting, including heat pump unit, ambient temperature sensor, water inlet temperature sensor and outer coil temperature sensor, control method as follows: heat pump unit acquisition shutdown time t1 And set shutdown time judgment value Δt1;Ambient temperature sensor acquires ambient temperature T1 And heat pump unit set ambient temperature judgment value ΔT1;Water inlet temperature sensor acquires water inlet temperature T2 And heat pump unit set water inlet temperature judgment value ΔT2;Outer coil temperature sensor acquires outer coil temperature T3 And heat pump unit set outer coil temperature judgment value ΔT3;Heat pump unit records defrosting operation time t2 And set defrosting time judgment value Δt2;Control stage is divided into six steps.The advantage is that the method is first defrosting operation after unit is started to heat, depositing in evaporative side lubricating oil is quickly absorbed back to compressor, ensure that compressor starts when oil return reliable operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of air source heat pump heating control method when starting. BACKGROUND

[0002] After air source heat pump unit is stopped at low ambient temperature and higher water temperature, the mixture of refrigerant and oil usually migrates and deposits to low temperature side evaporator, when starting heating after longer shutdown time, there is usually the situation of compressor oil shortage operation in initial stage of starting, the current solution is generally to use low frequency platform operation when starting compressor, to reduce the discharge oil amount of compressor in initial stage of starting operation, although this method can reduce the discharge oil amount of compressor, but the lubricating oil returned to compressor is also less, after a period of operation, there is still the situation of compressor oil shortage. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art and provide a kind of air source heat pump heating control method when starting, which is to enter defrosting operation after starting heating of unit, to quickly suck the lubricating oil deposited in evaporating side back to compressor, to ensure reliable operation of oil return when starting compressor.

[0004] In order to achieve the above purpose, the present application is realized, which is a kind of air source heat pump heating control method when starting, including heat pump unit, environment temperature sensor, water inlet temperature sensor and outer coil temperature sensor, and the control method is as follows:

[0005] Acquisition stage

[0006] Step one, heat pump unit acquires shutdown time t1 and sets shutdown time judgment value Δt1; environment temperature sensor acquires environment temperature T1 and heat pump unit sets environment temperature judgment value ΔT1; water inlet temperature sensor acquires water inlet temperature T2 and heat pump unit sets water inlet temperature judgment value ΔT2; outer coil temperature sensor acquires outer coil temperature T3 and heat pump unit sets outer coil temperature judgment value ΔT3; heat pump unit records defrosting operation time t2 and sets defrosting time judgment value Δt2;

[0007] Control stage

[0008] Step one, heat pump unit starts;

[0009] Step two, the first power-on time of heat pump unit is t3, when t3≥△t1 or t1≥△t1, enter step three, otherwise enter step six;

[0010] Step three, when T1≤△T1 and T2≥△T2, enter step four, otherwise enter step six;

[0011] Step four, heat pump unit enters defrosting stage, enter step five;

[0012] Step five, when T3≥△T3 or t2≥△t2, it is to enter step six, otherwise enter step four;

[0013] Step six, the heat pump unit enters the heating stage.

[0014] In the technical solution, the △t1≥4h.

[0015] In the technical solution, the △T1≤3℃.

[0016] In the technical solution, the △T2≥20℃.

[0017] In the technical solution, the △T3≥17℃.

[0018] Compared with the prior art, the method is to enter defrosting operation after the unit is started to heat, to quickly suck the lubricating oil deposited on the evaporation side back to the compressor, and to ensure reliable oil return operation of the compressor when starting. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a flow chart of the control stage of the application. DETAILED DESCRIPTION

[0020] The specific embodiments of the application will be further described below with reference to the accompanying drawings. It should be noted that the description of the embodiments is used to help understand the application, but does not constitute a limitation on the application. In addition, the technical features involved in the various embodiments of the application described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of the application, the terms "upper", "lower", "top" and "bottom" indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and do not require the application to be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0022] In the application, unless otherwise explicitly specified and limited, the terms "set", "connected", "located" and the like should be understood broadly, for example, it can be fixedly connected, it can be detachably connected, it can be detachably set or integrated; it can be mechanically connected, it can be directly connected, it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, and for those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0023] As Figure 1As shown, it is a control method for starting of air source heat pump heating, characterized in that it comprises a heat pump unit, an ambient temperature sensor, a water inlet temperature sensor and an outer coil temperature sensor, and the control method is as follows:

[0024] Collection stage

[0025] Step one, the heat pump unit collects the shutdown time t1 and sets the shutdown time judgment value Δt1; the ambient temperature sensor collects the ambient temperature T1 and the heat pump unit sets the ambient temperature judgment value ΔT1; the water inlet temperature sensor collects the water inlet temperature T2 and the heat pump unit sets the water inlet temperature judgment value ΔT2; the outer coil temperature sensor collects the outer coil temperature T3 and the heat pump unit sets the outer coil temperature judgment value ΔT3; the heat pump unit records the defrosting running time t2 and sets the defrosting time judgment value Δt2;

[0026] Control stage

[0027] Step one, the heat pump unit starts;

[0028] Step two, the first power-on time of the heat pump unit is t3, when t3≥Δt1 or t1≥Δt1, it is then entered into step three, otherwise it is entered into step six;

[0029] Step three, when T1≤ΔT1 and T2≥ΔT2, it is then entered into step four, otherwise it is entered into step six;

[0030] Step four, the heat pump unit enters the defrosting stage and enters step five;

[0031] Step five, when T3≥ΔT3 or t2≥Δt2, it is entered into step six, otherwise it is entered into step four;

[0032] Step six, the heat pump unit enters the heating stage.

[0033] The oil shortage running of the compressor is effectively solved when the air source heat pump unit is started to heat after being stopped for a period of time at low ambient temperature and high water temperature, and the reliable oil return running of the compressor is ensured when starting.

[0034] In this embodiment, the Δt1≥4h.

[0035] In this embodiment, the ΔT1≤3℃.

[0036] In this embodiment, the ΔT2≥20℃.

[0037] In this embodiment, the ΔT3≥17℃.

[0038] The embodiments of the present application are described in detail with reference to the accompanying drawings, but the present application is not limited to the described embodiments. Various changes, modifications, replacements and variations of the embodiments can be made by those skilled in the art without departing from the principles and spirit of the present application, and still fall within the scope of the present application.

Claims

1. A control method for an air source heat pump at the time of heating startup, characterized by The control method is as follows: including a heat pump unit, an ambient temperature sensor, an inlet water temperature sensor and an outer coil temperature sensor. The acquisition stage Step one, the heat pump unit acquires the shutdown time t1 and sets the shutdown time judgment value Δt1; the ambient temperature sensor acquires the ambient temperature T1 and the heat pump unit sets the ambient temperature judgment value ΔT1; the inlet water temperature sensor acquires the inlet water temperature T2 and the heat pump unit sets the inlet water temperature judgment value ΔT2; the outer coil temperature sensor acquires the outer coil temperature T3 and the heat pump unit sets the outer coil temperature judgment value ΔT3; the heat pump unit records the defrosting operation time t2 and sets the defrosting time judgment value Δt2; The control stage Step one, the heat pump unit starts; Step two, the first power-on time of the heat pump unit is t3, when t3≥Δt1 or t1≥Δt1, it is then entered into step three, otherwise it is entered into step six; Step three, when T1≤ΔT1 and T2≥ΔT2, it is then entered into step four, otherwise it is entered into step six; Step four, the heat pump unit enters the defrosting stage, and enters step five; Step five, when T3≥ΔT3 or t2≥Δt2, it is entered into step six, otherwise it is entered into step four; Step six, the heat pump unit enters the heating stage.

2. The control method for starting heating of an air-source heat pump according to claim 1, characterized by The Δt1≥4h.

3. The control method for starting heating of an air-source heat pump according to claim 1, characterized by The ΔT1≤3℃.

4. The control method for starting heating of an air-source heat pump according to claim 1, characterized by The ΔT2≥20℃.

5. The control method for starting heating of an air-source heat pump according to claim 1, characterized by The ΔT3≥17℃.

Images