CN1325858C - Defroasting method of air cooling heat pump system and its defroasting device - Google Patents

Defroasting method of air cooling heat pump system and its defroasting device Download PDF

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CN1325858C
CN1325858C CN 03150609 CN03150609A CN1325858C CN 1325858 C CN1325858 C CN 1325858C CN 03150609 CN03150609 CN 03150609 CN 03150609 A CN03150609 A CN 03150609A CN 1325858 C CN1325858 C CN 1325858C
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pressure control
air
defrosting
pressure
valve
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CN 03150609
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CN1590930A (en )
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蒋建平
董志明
吕久国
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浙江盾安人工环境设备股份有限公司
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Abstract

本发明公开了一种风冷热泵系统的除霜方法,它是在除霜过程中对冷凝压力进行控制,冷凝压力的控制既可以采用压差控制阀和冷凝压力调节阀联合作用,也可以单独采用冷凝压力控制阀进行控制。 The present invention discloses a method for defrosting air heat pump system, which is controlling the condensing pressure during defrosting, the condensation pressure control differential pressure control valve may be employed and combined action of the condensing pressure regulating valve may also be provided separately using condensation pressure control valve is controlled. 其除霜装置它包括空气换热器和储液器,在空气换热器进出口与储液器进口之间设有压力控制装置。 Means comprising defroster air heat exchanger and the accumulator, the pressure control means is provided in the heat exchanger between the air reservoir and the inlet and export. 所述的压力控制装置可以是包括压差控制器和冷凝压力控制阀,在空气侧换热器出口、冷凝压力调节阀与储液器进口的通路上还可设有单向阀。 Said pressure control means may be a differential pressure controller and a condensation pressure control valve, the air outlet side of the heat exchanger, condensation pressure regulating valve may be provided with a check valve and the accumulator inlet passage. 这种风冷热泵高效除霜方法,能对冷凝压力进行控制,使系统高低压能很快恢复正常状态,从而达到快速、彻底除霜目的的一种风冷热泵高效除霜方法。 This air-cooled heat pump defrosting efficient method capable of condensation pressure control, high and low pressure of the system can quickly return to normal state, so as to achieve rapid, complete air-cooled heat pump defrosting one kind of efficient method of defrosting purposes.

Description

一种风冷热泵系统的除霜方法及其除霜装置 Defrost Defrost method and apparatus for air-cooled heat pump system

技术领域 FIELD

本发明涉及一种用于制冷系统的除霜方法,特别是一种风冷热泵系统的除霜方法及其除霜装置。 The present invention relates to a method for defrosting a refrigeration system, particularly to a method of defrosting air-cooled heat pump system and a defrosting means.

技术背景现有风冷热泵系统装置一般如图1所示。 BACKGROUND OF THE INVENTION Existing devices typically air pump system shown in Fig. 风冷热泵机组在制热运行时,由于室外温度低,空气侧换热器3表面会逐渐结霜,随着霜层的加厚,机内换热器9的出风温度和制热能力逐渐降低,此时应进行除霜。 Air source heat pump in the heating operation, since the outdoor temperature is low, the air-side heat exchanger surface 3 will gradually frost with the frost layer is thickened, the air temperature and the heating capacity of the heat exchanger 9 of the machine gradually reduced, at this time should be defrosted. 除霜是否彻底是必须要关注的问题,如果除霜不彻底,进入制热后,未除掉的霜层和除霜水将会冻结成密度较大的霜或冰,很难再在下一次化掉,影响制热效果,造成低压保护,排气温度过高,甚至导致压缩机1损坏。 Defrost thoroughly whether the problem is necessary to pay attention to, if not completely defrost, after entering the heating, not get rid of frost and defrost water will freeze into ice cream or greater density, hard to the next of off effect heating effect, resulting in low voltage protection, the exhaust gas temperature is too high, and even lead to damage to the compressor 1.

风冷热泵机组目前大多采用反循环除霜装置,即除霜时四通阀2动作,将空气侧换热器3作为冷凝器,向其输送能量进行除霜。 Most currently used air source heat pump reverse cycle defrosting means, i.e. four-way valve 2 during the defrosting operation, the air-side heat exchanger as the condenser 3, the defrosting energy conveyed thereto. 这种除霜装置存在除霜能力不足,化霜时间比较长的缺点,根本原因在于除霜过程中系统高低压在较长的时间内不能恢复正常,压缩机工作不正常,表现如下:1)除霜开始后,制冷系统中的高、低压偏低,制冷剂循环量小,压缩机吸气少,容易产生低压保护。 Such deficiencies defrosting capacity defrosting apparatus, defrosting time is longer drawback is that the root cause can not return to normal within a defrosting system high and low pressure in a long time, the compressor is not working properly, as following: 1) after defrosting start, high cooling system, a low pressure is low, a small amount of the circulating refrigerant, compressor suction less prone to low voltage protection. 系统的高低压往往在除霜快要结束时才恢复正常,有效化霜时间较短。 High and low pressure systems tend to return to normal only when defrosting is about to end, effective defrosting time is shorter.

2)除霜开始后一段较长时间内,由于制冷系统中的高、低压偏低,压缩机输入功率和制冷量远远低于额定制冷工况相应值,压缩机能力不能发挥,除霜能力弱。 2) after the defrosting start over an extended period, due to the high cooling system, a low pressure is low, the compressor input power and cooling capacity is far lower than the corresponding values ​​of the rated cooling conditions, the compressor capacity can not play defrosting capacity weak.

发明内容 SUMMARY

本发明的目的是为了解决上述技术的不足而提供一种能对制冷系统中冷凝高低压在工作过程中能快速恢复正常状态,从而达到快速、彻底除霜目的的一种风冷热泵系统的除霜方法及其除霜装置。 Object of the present invention is to solve the problem of the above-described techniques and to provide an air-cooled heat pump system in addition to one condensate refrigeration system high and low pressure during operation can be quickly restored to normal state, so as to achieve rapid, complete defrosting purposes Cream defrosting method and apparatus.

为了达到上述目的,本发明所设计的一种风冷热泵系统的除霜方法,是在除霜过程中对冷凝压力进行控制,冷凝压力的控制既可以采用压差控制阀和冷凝压力调节阀联合作用。 To achieve the above object, a method of defrosting air heat pump system designed according to this invention, the condensing pressure is controlled during defrosting, the condensation pressure control differential pressure control valve may be employed and combined condensing pressure regulating valve effect. 这种风冷热泵系统的除霜方法其实现的除霜装置,它包括空气换热器和储液器,在空气换热器进出口与储液器进口之间设有压力控制装置,所述的压力控制装置包括压差控制器和冷凝压力调节阀,在空气侧换热器进口与储液器进口之间连接一个压差控制器,在空气侧换热器出口与储液器进口之间连接一个冷凝压力调节阀,在空气侧换热器出口、冷凝压力调节阀与储液器进口的通路上还设有单向阀,压差控制器出口位置或是位于单向阀和储液器之间;或是位于冷凝压力调节阀和单向阀之间;或是位于冷凝压力调节阀和储液器进口之间。 This method of defrosting a heat pump system air defroster its implementation, which includes an air heat exchanger and the accumulator, the pressure control means is provided in the heat exchanger between the air reservoir and the inlet Importers, the pressure control means comprises a pressure controller and a condensing pressure control valve, a differential pressure controller is connected between the air inlet side of the heat exchanger and the reservoir inlet, the reservoir outlet of the heat exchanger on the air side between the inlet connecting a condensing pressure regulating valve, the air outlet side of the heat exchanger, condensation pressure regulating valve also has a check valve and the accumulator inlet passage, the outlet pressure controller or a position located one-way valve and the accumulator between; or positioned between the condensing pressure regulating valve and the check valve; or condensing pressure regulating valve is located and between the reservoir inlet. 为了提高风冷热泵系统的除霜能力,必须尽量缩短系统高低压恢复正常状态的时间,提高除霜时的制冷剂循环量。 In order to increase the defrosting capacity of the heat pump system air-cooled, high and low pressure systems must minimize time to restore the normal state, the amount of the refrigerant to improve the cycle time of defrosting. 现有的除霜装置往往只注重于提高除霜时的制冷剂循环量,却没有意识到提高除霜时的冷凝压力,使系统的高低压维持正常才是解决除霜问题的根本所在。 Existing defroster tend to focus only on the amount of refrigerant circulation improves when defrosting, not realizing that the condensing pressure to improve defrosting, the high and low pressure systems to maintain normal defrosting is fundamental to solving the problem. 为此,本发明提供的一种风冷热泵高效除霜方法及其所得到的除霜装置,与一般的风冷热泵系统相比,具有以下特点:1)除霜开始后,在较短的时间内(半分钟左右),冷凝压力恢复正常(大于冷凝压力调节阀12的设定压力10bar),无效化霜时间短。 For this purpose, air-cooled heat pump defrosting apparatus for efficiently defrosting method and obtained by the present invention, compared with the general air-cooled heat pump system has the following characteristics: 1 after defrosting start), the shorter time (about half a minute), the condensing pressure returned to normal (the set pressure is greater than the condensing pressure regulating valve 12 10bar), invalid defrost time is short.

2)冷凝压力恢复正常后,制冷剂循环量和压缩机输入功率接近额定制冷工况相应值,除霜能力强,所需除霜时间短,除霜彻底。 After 2) condensing pressure returned to normal, and the amount of circulating refrigerant compressor input power close to the rated value corresponding cooling condition, strong ability defrosting, the defrosting time required is short, complete defrosting.

3)必须在系统中设置单独的储液器,并且要有足够的制冷剂充注量,以保证除霜过程储液器中仍有一定的液位;否则,高压气体旁通,制冷剂循环量不足,系统会产生低压保护。 3) must be provided in a separate reservoir system, and have a sufficient amount of refrigerant charge to ensure that the defrosting process in the reservoir is still a certain level; otherwise, bypass the high pressure gas, the refrigerant cycle an insufficient amount, the system will generate low voltage protection.

4)由于除霜能力很强,制冷剂液体需要从机内换热器吸收大量的热量。 4) Due to strong defrosting capacity, it requires a large amount of the liquid refrigerant heat absorption heat exchanger from the machine. 对于风冷冷热风热泵机组,为了防止“吹冷风”现象,需要的辅助电加热功率较大。 For the wind cold hot air heat pump, in order to prevent the "cold wind" phenomenon, auxiliary heating power needs of larger. 对于风冷冷热水热泵机组,由于可以直接从循环水中吸收热量,可以关闭用户侧风扇,避免“吹冷风”;同时由于除霜时间短,对水温的波动影响较小。 Cold water heat pump units to the wind, since it is possible to absorb heat from the circulating water, the user can turn off the side of the fan, to avoid "cold blow"; and because the defrosting time is short, less impact on the water temperature fluctuations.

附图说明 BRIEF DESCRIPTION

图1是现有技术的风冷热泵机组结构示意图;图2是本发明采用冷凝压力控制的风冷热泵机组实施例结构示意图;图3是单阀件冷凝压力控制风冷热泵机组实施例结构示意图;图4是实施例3的风冷热泵机组结构示意图; 1 is a schematic structure of a conventional heat pump air art; FIG. 2 is an air-cooled heat pump according to the present invention, condensation pressure control is a schematic structural embodiment; FIG. 3 is a single condensation pressure control valve member air source heat pump schematic structural embodiment ; FIG. 4 is a schematic diagram of the air source heat pump structure 3 embodiment;

具体实施方式 detailed description

下面通过实施例结合附图对本发明作进一步的描述,但下述实施例并不限制本发明的内容。 The following figures present invention will be further described by way of embodiments in conjunction with embodiments, but the following embodiments do not limit the present invention.

实施例1:如图2所示。 Example 1: 2 as shown in FIG. 本实施例描述的一种风冷热泵高效除霜方法,是在除霜过程中对冷凝压力进行控制,冷凝压力的控制采用压差控制阀和冷凝压力调节阀联合作用,其实施的除霜装置它包括空气侧换热器3和储液器4,在空气侧换热器3进出口与储液器4进口之间设有压力控制装置,所述的压力控制装置包括压差控制器11和冷凝压力控制阀12,在空气侧换热器3进口与储液器4进口之间连接一个压差控制器11,在空气侧换热器3出口与储液器4进口之间连接一个冷凝压力控制阀12。 One kind of air-cooled heat pump defrosting efficiency of the method described in the present embodiment, is performed during defrosting of the condensation pressure control, condensation pressure control valve differential pressure control and the condensing effect of the pressure regulating valve joint, which is implemented defroster it includes an air-side heat exchanger 3 and the accumulator 4, the air-side heat exchanger between the third port and the reservoir inlet 4 is provided with pressure control means, said pressure control means includes a controller 11 and condensation pressure control valve 12, between the air inlet side of the heat exchanger 3 and the accumulator 4 is connected an inlet pressure controller 11, connected between a condensing pressure air outlet side heat exchanger 3 and the accumulator inlet 4 control valve 12. 与一般的风冷热泵系统相比,该系统增加了两个阀件用于控制冷凝压力——压差控制阀11和冷凝压力调节阀12(目前市场上都可以买到)。 Compared with the general air-cooled heat pump system, the system adds two valve member for controlling the condensation pressure - differential pressure control valve 11 and the condensing pressure control valve 12 (currently on the market are available). 当冷凝压力调节阀12的进口压力大于设定压力(一般可设定为10bar)时全开,低于设定值则部分开启。 When the condensing pressure regulating valve 12 is greater than the inlet pressure set pressure (typically be set to 10bar) fully open, partially open below the set value. 压差控制阀11的开启压力差一般设定为1.4bar,全开压力差为3bar。 Differential pressure control valve opening pressure difference is generally set to 11 1.4bar, full pressure difference 3bar. 冷凝压力调节阀12和压差控制阀11联合作用,可以保证系统除霜循环时有足够高的冷凝压力。 Condensing pressure control valve 12 and the combined action of the differential pressure control valve 11, ensures a sufficiently high condensing pressure during a defrost cycle the system.

在进行正常的制热循环时,制冷剂不经过压差控制阀11和冷凝压力调节阀12。 During the normal heating cycle, the refrigerant does not pass through the condensing pressure control valve 11 and pressure control valve 12. 夏季制冷运行时,冷凝压力调节阀12完全开启、压差控制阀11全关,对正常的制冷循环影响很小,只是稍微增加了液体管路的压降(冷凝压力调节阀12压降很小)。 Summer cooling operation, condensation pressure control valve 12 fully open, the differential pressure control valve 11 is fully closed, has little effect on the normal refrigeration cycle, only slightly increases the pressure drop in the liquid line (condensing pressure regulating valve 12 is a small pressure drop ).

当系统需要除霜时,四通阀2动作,制冷剂气体经压缩机1流过四通阀2,进入空气侧换热器3。 When the system requires defrosting, the operation of the four-way valve 2, the refrigerant gas flows through the compressor 1 through the four-way valve 2, into the air-side heat exchanger 3. 除霜刚开始时由于空气侧换热器3内压力较低,因而冷凝压力调节阀12全关,压差控制阀11开启。 Due to the low pressure of the air within the 3-side heat exchanger, thus condensing pressure regulating valve 12 is fully closed when the defrost beginning, the differential pressure control valve 11 is opened. 随着制冷剂液体在空气侧换热器3内越积越多,冷凝压力逐渐升高;同时,因为热蒸汽的不断进入,储液器4中的温度、压力上升。 As the liquid refrigerant within the air-side heat exchanger 3 piled up, the condensing pressure is gradually increased; Meanwhile, since the hot steam continue to enter the temperature in the reservoir 4, the pressure rises. 在这个过程中,冷凝压力调节阀12逐渐开启、压差控制阀11逐渐关小。 In this process, the condensation pressure control valve 12 is gradually opened, pressure control valve 11 is gradually closed small. 随着除霜过程的持续进行,霜层不断减少,到除霜结束时,冷凝压力调节阀12完全开启、压差控制阀11全关,随后机组再进入下一个制热循环。 With the continued defrosting process, decreasing frost layer, to the end of the defrosting, the condensing pressure control valve 12 fully open, the differential pressure control valve 11 is fully closed, then a unit before the next heating cycle.

实施例2:根据控制冷凝压力的阀件结构和性能的不同,采用冷凝压力控制的风冷热泵系统可单独采用冷凝压力控制阀进行控制,如图3所示,本实施例所述的压力控制装置是冷凝压力控制阀13,空气侧换热器3的进出口为冷凝压力控制阀13的两个输入口,冷凝压力控制阀13的输出口通过单向阀5与储液器4连接。 Example 2: Pressure valve member depending on the structure and properties of the condensation pressure control, condensation pressure control using the air pump system may be employed alone condensation pressure control valve is controlled, as shown in FIG. 3, the embodiment of the present embodiment controls condensing means is a pressure control valve 13, the air-side heat exchanger 3 to export two input ports condensation pressure control valve 13, condensation pressure control valve output port 13 is connected through a check valve 5 and the accumulator 4. 它的特点是采用单一的阀件冷凝压力控制阀13代替压差控制阀11和冷凝压力调节阀12。 It is characterized by using a single valve member 13 instead of the condensation pressure control valve differential pressure control valve 11 and the condensing pressure control valve 12. 冷凝压力控制阀13只对出口压力的变化起反应,并在出口压力上升时打开。 Condensation pressure control valve outlet pressure 13 pairs variation reacts and opens the outlet when the pressure rises. 除了控制出口压力外,冷凝压力控制阀13的工作方式与采用压差控制阀11和冷凝压力调节阀12的系统完全相同,同样可以达到控制除霜过程中冷凝压力的目的。 In addition to controlling the outlet pressure, the condensation pressure control valve 13 works with differential pressure control valve 11 and the condensing pressure regulating valve 12 identical to the system, can also achieve the purpose of controlling the condensing pressure during defrosting. 为了防止制热循环时制冷剂液体不经过储液器4和空气侧换热器3而直接回到压缩机1造成液击,冷凝压力控制阀13置于单向阀5的前面。 In order to prevent the heating cycle of the refrigerant liquid does not pass through the reservoir 4 and the air-side heat exchanger 3 is directly returned to the compressor 1 caused by slugging, condensation pressure control valve 13 is disposed in front of the check valve 5.

实施例3:本实施例描述的一种风冷热泵系统的除霜方法及其除霜装置,是在空气侧换热器3出口、冷凝压力调节阀12与储液器4进口的通路上还设有单向阀5,单向阀5可以如图2所示,设在冷凝压力调节阀12的进口,也可以如图4所示,设在冷凝压力调节阀12的出口,压差控制阀11的出口位置既可以位于单向阀5和储液器4之间,也可以位于冷凝压力调节阀12和单向阀5之间,还可以是位于冷凝压力调节阀12和储液器4进口之间。 Example 3: A method for defrosting air heat pump system of the present embodiment described and defrosting means, is in the air outlet side of the heat exchanger 3, the condensing pressure regulating inlet valve 4 and the accumulator passage 12 is also 5 is provided with a check valve, the check valve 5 may be 2, provided in the condensation pressure regulating inlet valve 12, as shown in FIG. 4 may be provided at the outlet condensing pressure regulating valve 12, the differential pressure control valve the position of the outlet 11 of the check valve may be positioned between the accumulator 5 and 4, it may be positioned between the condensing pressure regulating valve 12 and the check valve 5 may also be located in the condensing pressure control valve 12 and the accumulator inlet 4 between.

Claims (1)

  1. 1.一种风冷热泵系统的除霜装置,它包括空气侧换热器(3)和储液器(4),其特征是在空气侧换热器(3)进出口与储液器(4)进口之间设有压力控制装置,所述的压力控制装置包括压差控制器(11)和冷凝压力调节阀(12),在空气侧换热器(3)进口与储液器(4)进口之间连接一个压差控制器(11),在空气侧换热器(3)出口与储液器(4)进口之间连接一个冷凝压力调节阀(12),在空气侧换热器(3)出口、冷凝压力调节阀(12)与储液器(4)进口的通路上还设有单向阀(5),压差控制器(11)出口位置或是位于单向阀(5)和储液器(4)之间;或是位于冷凝压力调节阀(12)和单向阀(5)之间;或是位于冷凝压力调节阀(12)和储液器(4)进口之间。 An air-cooled heat pump system defrosting means, which comprises an air-side heat exchanger (3) and the reservoir (4), characterized in that (3) Importers and accumulator in an air-side heat exchanger ( 4) is provided with pressure control means, said pressure control means comprises a pressure controller (11) and the condensing pressure control valve (12), (3) and accumulator inlet-side heat exchanger in the air (between the inlet 4 ) connected to a pressure controller (11) between the inlet, the air-side heat exchanger (3) and the reservoir outlet (4) connected to a pressure regulating valve between the condensate inlet (12), the air-side heat exchanger (3) outlet, the condensing pressure control valve (12) and the accumulator (4) is also provided with a check valve (5) on the inlet passage (11) located at the outlet position of the check valve or pressure controller (5 ) and the reservoir (4); or a condensing pressure control valve located between (12) and the check valve (5); condensing pressure control valve is located or (12) and the accumulator (4) importing of between.
CN 03150609 2003-08-28 2003-08-28 Defroasting method of air cooling heat pump system and its defroasting device CN1325858C (en)

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CN101865552A (en) * 2010-06-22 2010-10-20 合肥天鹅制冷科技有限公司 Air conditioning equipment
CN103292530A (en) * 2013-04-17 2013-09-11 张小明 Pressure difference switch pulse heating-up defrosting design for compression refrigeration systems
WO2014169703A3 (en) * 2013-04-17 2014-12-11 Zhang Xiaoming Pulse temperature increase energy-saving device for use with compression-type cooling or heating system
CN103292533A (en) * 2013-04-17 2013-09-11 张小明 Temperature difference switch pulse heating-up defrosting design for compression refrigeration systems
CN103322738A (en) * 2013-04-17 2013-09-25 张小明 Temperature difference switch heating and defrosting design applied to compression type heating system
CN103292531A (en) * 2013-04-17 2013-09-11 张小明 Pressure difference switch heating-up defrosting design for compression heating systems
CN103575006A (en) * 2013-11-25 2014-02-12 广东申菱空调设备有限公司 Low-temperature refrigeration type air-cooling water chilling unit and control method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949554A (en) * 1989-09-08 1990-08-21 Specialty Equipment Companies, Inc. Single pane, curved glass lid, frozen food merchandiser
JPH04356667A (en) * 1991-05-31 1992-12-10 Daikin Ind Ltd Heat pump type refrigerating apparatus
US6272870B1 (en) * 1999-10-27 2001-08-14 Emerson Electric Co. Refrigeration system having a pressure regulating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949554A (en) * 1989-09-08 1990-08-21 Specialty Equipment Companies, Inc. Single pane, curved glass lid, frozen food merchandiser
JPH04356667A (en) * 1991-05-31 1992-12-10 Daikin Ind Ltd Heat pump type refrigerating apparatus
US6272870B1 (en) * 1999-10-27 2001-08-14 Emerson Electric Co. Refrigeration system having a pressure regulating device

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