CN103822418B - Quasi-secondary compression heat pump system and control method thereof - Google Patents
Quasi-secondary compression heat pump system and control method thereof Download PDFInfo
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Abstract
The invention provides a kind of quasi-secondary compression heat pump system and control method thereof.The most quasi-secondary compression heat pump system control method comprises the following steps: obtain target superheat angle value；Obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve；Obtain the second temperature value on the connecting line between compressor and spray enthalpy valve；According to the actual super heat value of the mathematic interpolation between the first temperature value and the second temperature value；And the aperture of the first order flow regulator of quasi-secondary compression heat pump system is regulated according to target superheat angle value and actual super heat value, when making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor.The present invention is possible to prevent quasi-two-stage compression system that inverse spray occurs when spraying enthalpy valve and opening.
Description
Technical field
The present invention relates to technical field of heat pumps, in particular to a kind of quasi-secondary compression heat pump system and control method thereof.
Background technology
If heat pump uses two-stage compression, advantageously reduce the pressure ratio of system, improve systematic function.Existing quasi-two-stage compression system is usually and arranges spray enthalpy electromagnetic valve before compressor gas supplementing opening, spray enthalpy electromagnetic valve is opened under conditions of ambient temperature is relatively low, system heating capacity is improved by the approach increasing system refrigerant circulating load, but when spraying enthalpy electromagnetic valve and opening, when the pressure pressing chamber in compressor is higher than the pressure before spraying enthalpy electronic valve, compressor is pressed chamber can produce inverse spray, i.e. cold-producing medium can press chamber to spray from compressor, reduce systematic function, bring adverse influence to compressor reliability service simultaneously.The most usual settling mode is to increase a check valve before spray enthalpy valve, but this problem that can not be fully solved in compressor the inverse spray in pressure chamber.
Summary of the invention
It is desirable to provide a kind of quasi-secondary compression heat pump system control method being possible to prevent quasi-two-stage compression system that inverse spray occurs when spraying enthalpy valve and opening.
To achieve these goals, according to an aspect of the invention, it is provided a kind of quasi-secondary compression heat pump system control method, comprise the following steps: obtain target superheat angle value；Obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve；Obtain the second temperature value on the connecting line between compressor and spray enthalpy valve；According to the actual super heat value of the mathematic interpolation between the first temperature value and the second temperature value；And the aperture of the first order flow regulator of quasi-secondary compression heat pump system is regulated according to target superheat angle value and actual super heat value, when making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor.
Further, in the step obtaining target superheat angle value, the target superheat angle value obtained is determined by outdoor environment temperature, wherein: when outdoor environment temperature >=20 DEG C, target superheat angle value=1 DEG C；As 10 DEG C≤outdoor environment temperature ＜ 20 DEG C, target superheat angle value=3 DEG C；As outdoor environment temperature ＜ 10 DEG C, target superheat angle value=2 DEG C.
Further, the first temperature value obtained on the connecting line between flash vessel and spray enthalpy valve comprises the following steps: arrange the first temperature sensing device on the connecting line between flash vessel and spray enthalpy valve；And obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve according to the first temperature sensing device.
Further, the second temperature value obtained on the connecting line between compressor and spray enthalpy valve comprises the following steps: arrange the second temperature sensing device on the connecting line between compressor and spray enthalpy valve；And obtain the second temperature value on the connecting line between compressor and spray enthalpy valve according to the second temperature sensing device.
Further, the distance between the second temperature sensing device and spray enthalpy valve is equal to the distance between the first temperature sensing device and spray enthalpy valve.
Further, the distance between the second temperature sensing device and spray enthalpy valve is 10 centimetres, and the distance between the first temperature sensing device and spray enthalpy valve is 10 centimetres.
Further, determining that according to target superheat angle value and actual super heat value the aperture of the first order flow regulator of quasi-secondary compression heat pump system comprises the following steps: actual super heat value ＜ target superheat angle value, first order flow regulator aperture increases；The actual super heat value of target superheat angle value ＜, first order flow regulator aperture reduces；And target superheat angle value=actual super heat value, first order flow regulator aperture is constant.
Further, the aperture computing formula of first order flow regulator is: current aperture=original aperture+change aperture；Wherein change aperture is corresponding to the difference of actual super heat value with target superheat angle value.
According to another aspect of the present invention, it is provided that a kind of quasi-secondary compression heat pump system, including: the first acquisition module, it is used for obtaining target superheat angle value；Second acquisition module, for obtaining the first temperature value on the connecting line between flash vessel and spray enthalpy valve；3rd acquisition module, for obtaining the second temperature value on the connecting line between compressor and spray enthalpy valve；Computing module, for according to the actual super heat value of the mathematic interpolation between the first temperature value and the second temperature value；And adjustment module, for regulating the aperture of the first order flow regulator of quasi-secondary compression heat pump system according to target superheat angle value and actual super heat value, when making system open spray enthalpy valve, the intermediate pressure after one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor.
Further, the second acquisition module is included on the connecting line between flash vessel and spray enthalpy valve the first temperature sensing device arranged.
Further, the 3rd acquisition module is included on the connecting line between compressor and spray enthalpy valve the second temperature sensing device arranged.
Application technical scheme, by obtaining target superheat angle value, obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve, obtain the second temperature value on the connecting line between compressor and spray enthalpy valve, the aperture of the first order flow regulator of quasi-secondary compression heat pump system is determined according to described target superheat angle value and described actual super heat value, and then regulate the blood pressure lowering of the one-level throttling of quasi-two-stage compression system, when making system open spray enthalpy valve, intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor, thus prevent from compressor is pressed chamber contrainjection, the performance of limited raising system spray enthalpy, increase the reliability of compressor.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of the most quasi-secondary compression heat pump system；And
Fig. 2 shows the control flow chart of the most quasi-secondary compression heat pump system.
Detailed description of the invention
Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
As shown in Figure 1, according to embodiments of the invention, provide a kind of quasi-secondary compression heat pump system, including compressor 10, cross valve 20, condenser 30, first order flow regulator 40, flash vessel 50, second level flow regulator 60, vaporizer the 70, first temperature sensing device 91 and the second temperature sensing device 92.
Compressor 10 has the first air entry 10a, the second air entry 10b and air vent 10c；Flash vessel 50 has first interface 50a, the second interface 50b and the 3rd interface 50c；Condenser 30 has the first end interface 30a and the second end interface 30b；Vaporizer 70 has the first end interface 70a and the second end interface 70b.
First end interface 30a of condenser 30 is optionally connected with the second air entry 10b or air vent 10c, second end interface 30b of condenser 30 is connected with the second interface 50b of flash vessel 50, the first interface 50a of flash vessel 50 is connected with the first air entry 10a of compressor 10, the spray enthalpy pipeline of compressor 10 is defined between first interface 50a and the first air entry 10a, 3rd interface 50c of flash vessel 50 is connected with the first end interface 70a of vaporizer 70, second end interface 70b of vaporizer 70 is optionally connected with the second air entry 10b or air vent 10c of compressor 10.
Spray enthalpy valve 93 is arranged on the spray enthalpy pipeline between the first air entry 10a and first interface 50a, and this spray enthalpy valve 93 is electromagnetic valve.First temperature sensing device 91 is arranged on the connecting line between spray enthalpy valve 93 and flash vessel 50, second temperature sensing device 92 is arranged on the connecting line between spray enthalpy valve 93 and compressor 10, and the distance between the first temperature sensing device 91 and spray enthalpy valve 93 is equal with the distance between the second temperature sensing device 92 and spray enthalpy valve 93.
Preferably, the distance between the first temperature sensing device 91 and spray enthalpy valve 93 is 10 centimetres.Distance between second temperature sensing device 92 and spray enthalpy valve 93 is 10 centimetres.
First order flow regulator 40 is arranged on the connecting line between the second end interface 30b of condenser 30 and the second interface 50b of flash vessel 50, and second level flow regulator 60 is arranged on the connecting line between the 3rd interface 50c of flash vessel 50 and the first end interface 70a of vaporizer 70.
Here first order flow regulator 40 and second level flow regulator 60 are used to reducing pressure by regulating flow, can select electric expansion valve；Second level flow regulator 60 can also select capillary tube.
When heating or produce hot water, first end interface 30a of condenser 30 is connected with the air vent 10c of compressor 10,4th end interface 70b of vaporizer 70 is connected with the second air entry 10b of compressor 10 simultaneously, the high pressure gaseous coolant that now the air vent 10c of compressor 10 discharges enters condenser 30 and carries out heat exchange, and now condenser 30 plays the effect of condensation coolant.Coolant enters flash vessel 50 by the second interface 50b after first order flow regulator 40 carries out reducing pressure by regulating flow, and now first order flow regulator 40 is as the first order flow regulator of quasi-secondary compression heat pump system.Coolant is divided into two-way in flash vessel 50, a-road-through overspray enthalpy pipeline enters the first air entry 10a of compressor 10, and then enter the middle pressure chamber of compressor 10, after another road coolant continues reducing pressure by regulating flow by second level flow regulator 60, entering vaporizer 70 and carry out heat exchange, now vaporizer 70 plays and makes refrigerant evaporation effect.Then coolant enters the low pressure chamber of compressor 10 through the second air entry 10b of compressor 10, chamber is pressed in entering after completing one stage of compression inside compressor 10, the coolant entered with the first air entry 10a mixes, then two-stage compression is carried out, discharged by air vent 10c again, so move in circles, complete the process heating or producing hot water of quasi-secondary compression heat pump system.
In order to make the conversion between two duties of the quasi-secondary compression heat pump system more smooth and easy, connect between the second air entry 10b, air vent 10c, the first end interface 30a of condenser 30 and the second end interface 70b of vaporizer 70 and have cross valve 20, so that being in different connected states between the second air entry 10b, air vent 10c, condenser 30 and vaporizer 70.
In order to prevent the liquid in coolant from the performance of compressor 10 being impacted, compressor air suction pipeline is provided with gas-liquid separator 80.
Aforesaid condenser 30 can also replace with water container heat exchanger.
In conjunction with seeing Fig. 2, present invention also offers a kind of quasi-secondary compression heat pump system control method, comprise the following steps:
S100. target superheat angle value is obtained；
S200. the first temperature value T on the connecting line between flash vessel 50 and spray enthalpy valve 93 is obtained1；
S300. the second temperature value T on the connecting line between compressor 10 and spray enthalpy valve 93 is obtained2；
S400. according to the first temperature value T1With the second temperature value T2Between difference, i.e. T1-T2Calculate actual super heat value；And
S500. the aperture of the first order flow regulator of described quasi-secondary compression heat pump system is regulated according to described target superheat angle value and described actual super heat value, when making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor.
Wherein target superheat angle value is relevant from different outdoor environment temperatures, specifically:
When outdoor environment temperature >=20 DEG C, target superheat angle value=1 DEG C；
When 10 DEG C≤outdoor environment temperature ＜ 20 DEG C, target superheat angle value=3 DEG C；
When outdoor environment temperature ＜ 10 DEG C, target superheat angle value=2 DEG C.
According to a preferred embodiment of the present invention, S200. obtains the first temperature value T on the connecting line between flash vessel 50 and spray enthalpy valve 931Comprise the following steps:
S210. on the connecting line between flash vessel 50 and spray enthalpy valve 93, first temperature sensing device 91 is set；And
S220. the first temperature value T on the connecting line between flash vessel 50 and spray enthalpy valve 93 is obtained according to the first temperature sensing device 911。
Preferably, in order to obtain preferable effect, the distance between the first temperature sensing device 91 and spray enthalpy valve 93 is 10 centimetres.
According to another preferred embodiment of the present invention, S300. obtains the second temperature value T on the connecting line between compressor 10 and spray enthalpy valve 932Comprise the following steps:
S310. on the connecting line between compressor 10 and spray enthalpy valve 93, second temperature sensing device 92 is set；And
S320. the second temperature value T on the connecting line between compressor 10 and spray enthalpy valve 93 is obtained according to the second temperature sensing device 922。
Preferably, in order to obtain preferable effect, the distance between the second temperature sensing device 92 and spray enthalpy valve 93 is 10 centimetres.
Spray enthalpy valve forward and backward about the 10cm place that the core of the present invention is on spray enthalpy pipeline is respectively arranged the first temperature sensing device and the second temperature sensing device, and first order flow regulator preferably employs electric expansion valve, its aperture is that the difference of temperature T1 and the T2 experienced according to the first temperature sensing device and the second temperature sensing device is controlled.
According to another preferred embodiment of the present invention, S500. the aperture of the first order flow regulator of described quasi-secondary compression heat pump system is regulated according to described target superheat angle value and described actual super heat value, when making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or comprises the following steps equal to the pressure in the middle pressure chamber of compressor:
When actual super heat value ＜ target superheat angle value, first order flow regulator aperture increases；
When the actual super heat value of target superheat angle value ＜, first order flow regulator aperture reduces；And
When target superheat angle value=actual super heat value, first order flow regulator aperture is constant.
The input parameter controlling first order flow regulator has: the T1 of the first temperature sensing device 91 acquisition, the T2 of the second temperature sensing device 92 acquisition, ambient temperature Te, aperture Pi of previous time period first order flow regulator, and the aperture computing formula of current first order flow regulator is:
Current aperture Pi+1=original aperture Pi+ change aperture △ P1；
Wherein change aperture △ P1Difference corresponding to actual super heat value-target superheat angle value gained.
Such as: when | actual super heat value-target superheat angle value | is when=1 DEG C, and first order flow regulator step number changes 1 step.
Accordingly, present invention also offers a kind of quasi-secondary compression heat pump system, including the first acquisition module, the second acquisition module, the 3rd acquisition module, computing module and adjustment module.Wherein the first acquisition module is used for obtaining target superheat angle value；Second acquisition module is for obtaining the first temperature value on the connecting line between flash vessel 50 and spray enthalpy valve 93；3rd acquisition module is for obtaining the second temperature value on the connecting line between compressor 10 and spray enthalpy valve 93；Computing module is for according to the actual super heat value of the mathematic interpolation between the first temperature value and the second temperature value；Adjustment module for regulating the aperture of the first order flow regulator of quasi-secondary compression heat pump system according to target superheat angle value and actual super heat value, when the system of making opens spray enthalpy valve 93, the intermediate pressure after one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor 10.
Preferably, the second acquisition module is included on the connecting line between flash vessel 50 and spray enthalpy valve 93 the first temperature sensing device 91 arranged；3rd acquisition module is included on the connecting line between compressor 10 and spray enthalpy valve 93 the second temperature sensing device 92 arranged.
From above description, can be seen that, the above embodiments of the present invention achieve following technique effect: by obtaining target superheat angle value, obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve, obtain the second temperature value on the connecting line between compressor and spray enthalpy valve, the aperture of the first order flow regulator of quasi-secondary compression heat pump system is determined according to described target superheat angle value and described actual super heat value, and then regulate the blood pressure lowering of the one-level throttling of quasi-two-stage compression system, when making system open spray enthalpy valve, intermediate pressure after first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of compressor, thus prevent from compressor is pressed chamber contrainjection, the performance of limited raising system spray enthalpy, increase the reliability of compressor.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (11)
1. a quasi-secondary compression heat pump system control method, it is characterised in that comprise the following steps:
Obtain target superheat angle value；
Obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve；
Obtain the second temperature value on the connecting line between compressor and described spray enthalpy valve；
According to the actual super heat value of mathematic interpolation between described first temperature value and described second temperature value；And
The aperture of the first order flow regulator of quasi-secondary compression heat pump system is regulated according to described target superheat angle value and described actual super heat value, when making system open described spray enthalpy valve, intermediate pressure after described first order flow regulator carries out one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of described compressor, on the spray enthalpy pipeline that described spray enthalpy valve is arranged between the first air entry of described compressor and the first interface of described flash vessel, described first order flow regulator is arranged between the second end interface of condenser and the second interface of described flash vessel.
Quasi-secondary compression heat pump system control method the most according to claim 1, it is characterised in that in the step obtaining described target superheat angle value, the described target superheat angle value obtained is determined by outdoor environment temperature, wherein:
When described outdoor environment temperature >=20 DEG C, described target superheat angle value=1 DEG C；
As 10 DEG C≤described outdoor environment temperature ＜ 20 DEG C, described target superheat angle value=3 DEG C；
As described outdoor environment temperature ＜ 10 DEG C, described target superheat angle value=2 DEG C.
Quasi-secondary compression heat pump system control method the most according to claim 1, it is characterised in that described first temperature value on connecting line between the described flash vessel of described acquisition and described spray enthalpy valve comprises the following steps:
On connecting line between described flash vessel and described spray enthalpy valve, the first temperature sensing device is set；And
Described first temperature value on the connecting line between described flash vessel and described spray enthalpy valve is obtained according to described first temperature sensing device.
Quasi-secondary compression heat pump system control method the most according to claim 3, it is characterised in that described second temperature value on connecting line between the described compressor of described acquisition and described spray enthalpy valve comprises the following steps:
On connecting line between described compressor and described spray enthalpy valve, the second temperature sensing device is set；And
Described second temperature value on the connecting line between described compressor and described spray enthalpy valve is obtained according to described second temperature sensing device.
Quasi-secondary compression heat pump system control method the most according to claim 4, it is characterised in that the distance between described second temperature sensing device and described spray enthalpy valve is equal to the distance between described first temperature sensing device and described spray enthalpy valve.
Quasi-secondary compression heat pump system control method the most according to claim 5, it is characterised in that the distance between described second temperature sensing device and described spray enthalpy valve is 10 centimetres, the distance between described first temperature sensing device and described spray enthalpy valve is 10 centimetres.
Quasi-secondary compression heat pump system control method the most according to any one of claim 1 to 6, it is characterized in that, the aperture of the described described first order flow regulator determining described quasi-secondary compression heat pump system according to described target superheat angle value and described actual super heat value comprises the following steps:
Target superheat angle value described in described actual super heat value ＜, described first order flow regulator aperture increases；
Actual super heat value described in described target superheat angle value ＜, described first order flow regulator aperture reduces；And
Described target superheat angle value=described actual super heat value, described first order flow regulator aperture is constant.
Quasi-secondary compression heat pump system control method the most according to claim 7, it is characterised in that the aperture computing formula of described first order flow regulator is:
Current aperture=original aperture+change aperture；
Wherein said change aperture is corresponding to the difference of described actual super heat value with described target superheat angle value.
9. a quasi-secondary compression heat pump system, it is characterised in that including:
First acquisition module, is used for obtaining target superheat angle value；
Second acquisition module, for obtaining the first temperature value on the connecting line between flash vessel and spray enthalpy valve；
3rd acquisition module, for obtaining the second temperature value on the connecting line between compressor and described spray enthalpy valve；
Computing module, for according to the actual super heat value of mathematic interpolation between described first temperature value and described second temperature value；And
Adjustment module, for regulating the aperture of the first order flow regulator of described quasi-secondary compression heat pump system according to described target superheat angle value and described actual super heat value, when making system open described spray enthalpy valve, intermediate pressure after one-level throttling is consistently greater than or is equal to the pressure in the middle pressure chamber of described compressor, on the spray enthalpy pipeline that described spray enthalpy valve is arranged between the first air entry of described compressor and the first interface of described flash vessel, described first order flow regulator is arranged between the second end interface of condenser and the second interface of described flash vessel.
Quasi-secondary compression heat pump system the most according to claim 9, it is characterised in that described second acquisition module is included on the connecting line between described flash vessel and described spray enthalpy valve the first temperature sensing device arranged.
11. quasi-secondary compression heat pump systems according to claim 9, it is characterised in that described 3rd acquisition module is included on the connecting line between described compressor and described spray enthalpy valve the second temperature sensing device arranged.
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| CN105371548B (en) | 2015-12-11 | 2017-11-21 | 珠海格力电器股份有限公司 | Gas-supplying enthalpy-increasing control method, equipment and the device of double-stage compressor |
| CN105485989B (en) * | 2015-12-14 | 2018-03-13 | 珠海格力电器股份有限公司 | A kind of gas supply control method of Two-stage Compression air-conditioning system |
| CN106931546B (en) * | 2017-03-27 | 2023-10-31 | 广东美的制冷设备有限公司 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN106931545B (en) * | 2017-03-27 | 2023-10-27 | 广东美的制冷设备有限公司 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN107676998A (en) * | 2017-09-15 | 2018-02-09 | 广东芬尼克兹节能设备有限公司 | A kind of double degree of superheat control dehumidification systems and method |
| CN111578547B (en) * | 2020-05-28 | 2021-06-08 | 珠海格力电器股份有限公司 | Control method of double-backheating refrigerating system |
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| US7111469B2 (en) * | 2004-09-22 | 2006-09-26 | Horan Christopher J | Process for refrigerant charge level detection using a neural net |
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