CN207963012U - A kind of novel year round cooling handpiece Water Chilling Units - Google Patents
A kind of novel year round cooling handpiece Water Chilling Units Download PDFInfo
- Publication number
- CN207963012U CN207963012U CN201820397032.3U CN201820397032U CN207963012U CN 207963012 U CN207963012 U CN 207963012U CN 201820397032 U CN201820397032 U CN 201820397032U CN 207963012 U CN207963012 U CN 207963012U
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- pressure
- cooling
- cooling water
- ratio adjusting
- adjusting valve
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000001816 cooling Methods 0.000 title claims abstract description 41
- 239000000498 cooling water Substances 0.000 claims abstract description 77
- 238000012423 maintenance Methods 0.000 claims abstract description 25
- 239000003507 refrigerant Substances 0.000 claims abstract description 20
- 239000000446 fuel Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000005494 condensation Effects 0.000 abstract description 4
- 238000009833 condensation Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a kind of novel year round cooling handpiece Water Chilling Units, belong to Refrigeration Technique, enough height pressure differences are difficult to set up when winter northern area cooling water temperature is relatively low in compressor short time startup stage, the utility model installs pressure maintenance valve in the exhaust outlet of compressor, the external pressure Balanced interface of pressure maintenance valve is connected to the low-pressure side of refrigerant circuit, and sets ratio adjusting valve on the cooling water channel of condenser.After compressor start, pressure maintenance valve closes exhaust passage, and pressure at expulsion rises quickly, and when the Opening pressure that system height pressure difference reaches setting maintains the pressure difference of valve, pressure maintenance valve is opened, and compressor air-discharging can smoothly enter into condensation in condenser.Simultaneously the aperture of ratio adjusting valve is controlled in conjunction with the height of cooling water leaving water temperature in this start-up course, cooling water leaving water temperature is set to be promoted, to set up high pressure and enough height pressure differences rapidly in a short time, reach the requirement of the most safe fuel feeding pressure difference of compressor.
Description
Technical field
The utility model belongs to Refrigeration Technique, and in particular to a kind of novel year round cooling handpiece Water Chilling Units.
Background technology
With the fast development of China's economy in recent years, the living standard of the people increasingly improves, and the use of air-conditioning is increasingly
Generally.Water cooled chiller is widely used in the air-conditionings such as hotel, restaurant, school, theater, market, office building, residential building, hospital
Place, it can also be used to the technical coolings process such as nuclear power, plastics chemical industry, precision instrument.It can be seen that its reliability seems very heavy
It wants and crucial.It is intended to the water cooled chiller of operation throughout the year, often because the factors such as weather conditions cause cooling water
Temperature is low, and the pressure at system high pressure end does not increase when unit cold start-up, and compressor high and low pressure side can not establish enough height pressure differences,
Can not be loaded so as to cause compressor, the appearance for situations such as compressor oil-supplying is insufficient, be easy to cause compressor because of lubrication, it is cooling not
It is sufficient and seriously damaged.
Existing technical solution one：Year round cooling handpiece Water Chilling Units are maintained by installing pressure in exhaust outlet of compressor
Valve can set up enough height pressure differences, reach wanting for compressor minimum safe fuel feeding pressure difference in a short time after a cold start
It asks, and then ensures that compressor displacement regulating load is smooth, ensure that compressor will not generate catastrophe failure because mistake oil or fuel feeding are bad.But
Be when northern area environment temperature is relatively low, but still can be because of high-pressure although enough height pressure differences can be set up
It does not increase and causes the too low frequent protection failure of low pressure.
Existing technical solution two：Increase water regulating valve on year round cooling handpiece Water Chilling Units cooling water channel, passes through
It adjusts the cooling water inflow into condenser and is gradually increased under conditions of shielding height differential pressure security during compressor start
Unit high pressure avoids causing fault alarm or shutdown because fuel feeding is bad.But this adjustment capability is suitable in cold winter
It is limited, especially in the cold-start phase of unit, in fact it could happen that chilled water temperature is higher than the case where cooling water temperature, though have cold
High pressure can be gradually increased by water flow regulative mode, but still compressor can occur and open by but water flow ratio adjusting valve
Occurs the possibility that low pressure is higher than high pressure during dynamic, height pressure difference cannot be set up and cause compressor injury and shadow immediately
Ring its service life.
Utility model content
The technical problems to be solved in the utility model and the technical assignment of proposition are to overcome winter northern area coolant water temperature
It is difficult to set up that enough height pressure differences, low pressure is too low, high the problem of forcing down when spending relatively low in compressor short time startup stage, carries
For a kind of novel year round cooling handpiece Water Chilling Units reliable and can steadily producing chilled water under the premise of coolant water temperature is lower.
In order to achieve the above objectives, the novel year round cooling handpiece Water Chilling Units of the utility model, include the flow direction according to refrigerant
The Ya Suo Ji ﹑ Leng Ning Qi ﹑ Jie stream Zhuan Zhi ﹑ evaporators being connected in refrigerant circuit, the condenser are connected through cooling water channel
Cooling tower, it is characterized in that：The exhaust outlet of the compressor installs a pressure maintenance valve, and the pressure maintenance valve is connected to the compression
The exhaust outlet of machine and the condenser, the pressure maintenance valve have external pressure Balanced interface, the external pressure flat
Weighing apparatus interface is connected to the low-pressure side of refrigerant circuit, is set on the cooling water channel and adjusts condenser cooling by adjusting aperture
The ratio adjusting valve of water leaving water temperature.
As optimization technique means：The condenser is through cooling water channel outlet pipe, the connection cooling of cooling water channel water inlet pipe
Tower, the ratio adjusting valve are connected between the cooling water channel outlet pipe, cooling water channel water inlet pipe.
As optimization technique means：The water outlet of the condenser be equipped with temperature sensor, the ratio adjusting valve by
It controls in the temperature sensor.
As optimization technique means：The ratio adjusting valve is threeway ratio adjusting valve, the threeway ratio adjusting valve
Two interface tandems are cold described in another interface connection of the threeway ratio adjusting valve in the cooling water channel outlet pipe
But water route water inlet pipe.
As optimization technique means：Cooling water channel water inlet pipe between the condenser and the threeway ratio adjusting valve
It is equipped with cooling water pump.
As optimization technique means：The ratio adjusting valve is two-way ratio adjusting valve, the two-way ratio adjusting valve
Two interfaces are separately connected the cooling water channel outlet pipe, cooling water channel water inlet pipe.
As optimization technique means：Cooling water channel water inlet between the cooling tower and the two-way ratio adjusting valve
Pipe is equipped with cooling water pump.
As optimization technique means：The external pressure Balanced interface is connected to the low-pressure side of the compressor.
The utility model installs pressure maintenance valve by the exhaust outlet in compressor, enables the external pressure of pressure maintenance valve flat
Weighing apparatus interface is connected to the low-pressure side of refrigerant circuit, and is set on cooling water channel and adjust condenser cooling water by adjusting aperture
The ratio adjusting valve of leaving water temperature.
After compressor start, pressure maintenance valve closes exhaust passage, and pressure at expulsion rises quickly, when system height pressure difference
When reaching the pressure difference of Opening pressure maintenance valve of setting, pressure maintenance valve is opened, and compressor air-discharging can smoothly enter into cold in condenser
It is solidifying.The aperture of ratio adjusting valve is controlled in conjunction with the height of cooling water leaving water temperature in this start-up course simultaneously, makes cooling water
Leaving water temperature is promoted, and to set up high pressure and enough height pressure differences rapidly in a short time, reaches the most safe confession of compressor
The requirement of oil pressure difference, so ensure compressor displacement regulating load it is smooth, ensure compressor will not because fuel feeding is bad generates seriously therefore
Barrier, while the too low error protection phenomenon of unit starting stage frequent low pressure will not occur, improve the reliability of machine set system.
Description of the drawings
Fig. 1 is a kind of schematic diagram of the novel year round cooling handpiece Water Chilling Units of the utility model；
Fig. 2 is another schematic diagram of the novel year round cooling handpiece Water Chilling Units of the utility model；
Fig. 3 is the structural schematic diagram of the pressure maintenance valve of the utility model；
Figure label explanation：
1- compressors, 2- pressure maintenance valves, 3- external pressure Balanced interfaces, 4- condensers, 5- temperature sensors, 6a- tri-
Logical ratio adjusting valve, 6b- two-way ratio adjusting valves, 7- cooling towers, 8- cooling water pumps, 9- throttling sets, 10- evaporators.
51- balance pipes, 52- valve bodies, 53- spools, 54- spring assemblies, 55- intake interfaces, 56- outlet interfaces are detectd before 57-
Interface is surveyed, interface is detected after 58-.
Specific implementation mode
The utility model is described further below in conjunction with Figure of description.
As shown in Figure 1 and Figure 2, the common ground of this two kinds novel year round cooling handpiece Water Chilling Units is：Include the stream according to refrigerant
To 1 ﹑ condensers of compressor, 4 ﹑ throttling sets, the 9 ﹑ evaporators 10 being connected in refrigerant circuit, condenser 4 connects through cooling water channel
Connect cooling tower 7, the exhaust outlet of compressor 1 installs a pressure maintenance valve 2, pressure maintenance valve 2 be connected to the exhaust outlet of compressor 1 with it is cold
There is external pressure Balanced interface 3, external pressure Balanced interface 3 to be connected to the low of refrigerant circuit for condenser 4, pressure maintenance valve 2
Side is pressed, is set on cooling water channel and adjusts the ratio adjusting valve of condenser cooling water leaving water temperature by adjusting aperture.
Further, condenser 4 connects cooling tower 7, ratio adjusting valve through cooling water channel outlet pipe, cooling water channel water inlet pipe
It is connected between cooling water channel outlet pipe, cooling water channel water inlet pipe.The water outlet of condenser is equipped with temperature sensor 5, ratio tune
Section valve is controlled by temperature sensor.External pressure Balanced interface is connected to the low-pressure side of compressor（Air entry side）.
As shown in figure 3, pressure maintenance valve 2 is made of components such as valve body 52, spool 53, spring assembly 54, balance pipes 51.
When unit works, 55 connect compressor of intake interface outlet, outlet interface 56 connects condenser inlet, and preceding detecting interface 57 is used for
Pressure before sensing valve, the rear pressure for detecting interface 58 for after sensing valve can be maintained certain by the setting of spring force
Pressure difference before and after valve.
In addition to above-mentioned common ground, novel year round cooling handpiece Water Chilling Units shown in Fig. 1 and novel year round cooling cooling-water machine shown in Fig. 2
There are following differences for group：
In novel year round cooling handpiece Water Chilling Units shown in FIG. 1, ratio adjusting valve is threeway ratio adjusting valve 6a, the threeway ratio
Two interface tandems of example regulating valve are in cooling water channel outlet pipe, another interface connection cooling of the threeway ratio adjusting valve
Water route water inlet pipe.Cooling water channel water inlet pipe between condenser and threeway ratio adjusting valve is equipped with cooling water pump 8.
In novel year round cooling handpiece Water Chilling Units shown in Fig. 2, ratio adjusting valve is two-way ratio adjusting valve 6b, the two-way ratio
Two interfaces of example regulating valve are separately connected cooling water channel outlet pipe, cooling water channel water inlet pipe.Cooling tower and two-way proportion adjustment
Cooling water channel water inlet pipe between valve is equipped with cooling water pump.
The operation principle of novel year round cooling handpiece Water Chilling Units shown in Fig. 1, Fig. 2 is：The sucking of compressor 1 carrys out flash-pot 10
Low-temperature low-pressure refrigerant steam, to becoming the superheated steam of high temperature and pressure after the refrigerant vapor compression work done of low-temp low-pressure.Pressure
Power maintain valve 2 be installed on exhaust outlet of compressor and at the top of pressure maintenance valve by balance pipe 3 by compressor air suction lateral pressure
Signal is directed into pressure maintenance valve.The superheated steam of high temperature and pressure is by pressure maintenance valve 2 into condenser 4 and in condenser
Heat exchange is carried out by cooling tower 7 and the lower surrounding air of temperature in 4, by the heat transfer discharged in condensation process to sky
Gas makes gaseous refrigerant be condensed into highly pressurised liquid.The water temperature for monitoring cooling water water outlet by temperature sensor 5 in the process is high
It is low to control ratio adjusting valve（It is threeway ratio adjusting valve in Fig. 1, is two-way ratio adjusting valve in Fig. 2）Opening size, from
And condensation temperature is controlled on lowest range.High-pressure refrigerant becomes low-temp low-pressure and liquid after 9 reducing pressure by regulating flow of throttling set
The refrigerant of the higher gas-fluid two-phase mixture of body content, these gas-liquid two-phases enters evaporator 10, in evaporator 10, low pressure
With temperature relatively high chilled water heat exchange occurs for the refrigerant of low temperature, and refrigerant liquid will gasify, absorption refrigerating
Become low-temperature low-pressure refrigerant steam after the heat of water, the temperature to reduce chilled water reaches refrigeration purpose.After gasification
Refrigerant vapour will be inhaled into compressor, so on circulate.
When in Fig. 1 by the adjusting water temperature of threeway ratio adjusting valve：Cooling water pump entrance is returned all the way, removes cooling tower all the way
7.The cooling water outlet temperature t that the initial opening of ratio adjusting valve is detected according to temperature sensor is determined, as 10 DEG C of ＜ t ＜ 30
DEG C when, threeway proportion adjustment valve opening changes linearly.If detecting cooling water outlet temperature t≤30 DEG C in normal course of operation, open
The big roads A flow（The flow of cooling water channel water inlet pipe is flowed to from cooling water channel outlet pipe）, part cooling water is made to bypass back cooling water
8 imports are pumped, the water flow into cooling tower is reduced, reduces heat dissipation, so that coolant water temperature rises because of the heat dissipation of condenser, makes machine
The high pressure of group being capable of fast lifting.If 32 DEG C of cooling water outlet temperature t ＞, turn down the roads A flow（It is flowed to from cooling water channel outlet pipe
The flow of cooling water channel water inlet pipe）, when leaving water temperature is up to 35 DEG C, A bypass flows are completely closed, all cooling waters are through supercooling
But tower is cooled down.
When in Fig. 2 by the adjusting water temperature of two-way ratio adjusting valve：The initial opening of two-way ratio adjusting valve is according to being examined
The cooling water outlet temperature t of survey determines, as 30 DEG C of 10 DEG C of ＜ t ＜, the aperture of two-way ratio adjusting valve changes linearly.Normally
If detecting cooling water outlet temperature t≤30 DEG C in operational process, the flow of big two-way ratio adjusting valve is opened, is reduced into condenser
Water flow, the leaving water temperature into the smaller cooling water of water flow of condenser is higher, can quickly be carried to the high pressure of unit
It rises.If 32 DEG C of cooling water outlet temperature t ＞, the flow of two-way ratio adjusting valve is gradually turned down, increases the cooling water inflow for removing condenser,
Prevent cooling water water outlet excessively high.
The utility model overcome winter northern area cooling water temperature it is relatively low when compressor short time startup stage in it is difficult
Enough height pressure differences, low pressure is too low, high the problem of forcing down to establish, after compressor start, because exhaust passage is closed, and exhaust pressure
Power rises quickly, and when system height pressure difference reaches the valve opening pressure difference of setting, pressure maintenance valve spool 53 moves up, and valve is opened,
Compressor air-discharging can smoothly enter into condensation in condenser.It is controlled simultaneously in conjunction with the height of cooling water leaving water temperature in this start-up course
The aperture of ratio adjusting valve processed makes cooling water leaving water temperature be promoted, to set up high pressure and enough rapidly in a short time
Height pressure difference reaches the requirement of the most safe fuel feeding pressure difference of compressor, and then ensures that compressor displacement regulating load is smooth, ensures compressor
Catastrophe failure will not be generated because fuel feeding is bad, while it is existing that the unit starting stage too low error protection of frequent low pressure will not occur
As improving the reliability of machine set system.
Claims (8)
1. novel year round cooling handpiece Water Chilling Units include the compressor being connected to according to the flow direction of refrigerant in refrigerant circuit（1）﹑
Condenser（4）﹑ throttling sets（9）﹑ evaporators（10）, the condenser（4）Cooling tower is connected through cooling water channel（7）, special
Sign is：The compressor（1）Exhaust outlet install a pressure maintenance valve（2）, the pressure maintenance valve（2）It is connected to the compressor
Exhaust outlet and the condenser（4）, the pressure maintenance valve（2）With external pressure Balanced interface（3）, the outside
Pressure balance interface（3）It is connected to the low-pressure side of refrigerant circuit, sets on the cooling water channel and is adjusted by adjusting aperture
The ratio adjusting valve of condenser cooling water leaving water temperature.
2. novel year round cooling handpiece Water Chilling Units according to claim 1, it is characterized in that：The condenser（4）Through cooling
Water route outlet pipe, cooling water channel water inlet pipe connect cooling tower（7）, the ratio adjusting valve is connected to the cooling water channel and goes out
Between water pipe, cooling water channel water inlet pipe.
3. novel year round cooling handpiece Water Chilling Units according to claim 2, it is characterized in that：The condenser（4）Water outlet
Equipped with temperature sensor（5）, the ratio adjusting valve is controlled by the temperature sensor.
4. novel year round cooling handpiece Water Chilling Units according to claim 2, it is characterized in that：The ratio adjusting valve is threeway
Ratio adjusting valve（6a）, the threeway ratio adjusting valve（6a）Two interface tandems in the cooling water channel outlet pipe, should
Threeway ratio adjusting valve（6a）Another interface connection cooling water channel water inlet pipe.
5. novel year round cooling handpiece Water Chilling Units according to claim 4, it is characterized in that：The condenser and the threeway
Cooling water channel water inlet pipe between ratio adjusting valve is equipped with cooling water pump（8）.
6. novel year round cooling handpiece Water Chilling Units according to claim 2, it is characterized in that：The ratio adjusting valve is two-way
Ratio adjusting valve（6b）, two interfaces of the two-way ratio adjusting valve are separately connected the cooling water channel outlet pipe, cooling water
Road water inlet pipe.
7. novel year round cooling handpiece Water Chilling Units according to claim 6, it is characterized in that：The cooling tower and described two
Cooling water channel water inlet pipe between logical ratio adjusting valve is equipped with cooling water pump（8）.
8. novel year round cooling handpiece Water Chilling Units according to claim 1, it is characterized in that：The external pressure Balanced interface
（3）It is connected to the compressor（1）Low-pressure side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820397032.3U CN207963012U (en) | 2018-03-22 | 2018-03-22 | A kind of novel year round cooling handpiece Water Chilling Units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820397032.3U CN207963012U (en) | 2018-03-22 | 2018-03-22 | A kind of novel year round cooling handpiece Water Chilling Units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207963012U true CN207963012U (en) | 2018-10-12 |
Family
ID=63725879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820397032.3U Expired - Fee Related CN207963012U (en) | 2018-03-22 | 2018-03-22 | A kind of novel year round cooling handpiece Water Chilling Units |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207963012U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110671768A (en) * | 2019-10-23 | 2020-01-10 | 深圳市俊安环境科技有限公司 | Control system of cold accumulation central air conditioner |
| CN111059661A (en) * | 2019-12-23 | 2020-04-24 | 青岛海尔空调电子有限公司 | Water chilling unit and control method thereof |
| CN111637611A (en) * | 2020-05-18 | 2020-09-08 | 珠海格力电器股份有限公司 | Water chilling unit control method and device, storage medium and water chilling unit |
| CN112797607A (en) * | 2021-01-04 | 2021-05-14 | 珠海格力电器股份有限公司 | Heat recovery system, control method and air conditioning unit |
| CN113137713A (en) * | 2021-03-10 | 2021-07-20 | 青岛海尔空调电子有限公司 | Control method of air conditioning system and air conditioning system |
| CN113865004A (en) * | 2021-09-30 | 2021-12-31 | 珠海格力电器股份有限公司 | Cooling water anti-freezing control method, cooling water anti-freezing system and air conditioning system |
| CN114353382A (en) * | 2021-11-30 | 2022-04-15 | 青岛海尔空调电子有限公司 | Starting control method and device of air source heat pump unit and storage medium |
-
2018
- 2018-03-22 CN CN201820397032.3U patent/CN207963012U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110671768A (en) * | 2019-10-23 | 2020-01-10 | 深圳市俊安环境科技有限公司 | Control system of cold accumulation central air conditioner |
| CN111059661A (en) * | 2019-12-23 | 2020-04-24 | 青岛海尔空调电子有限公司 | Water chilling unit and control method thereof |
| CN111059661B (en) * | 2019-12-23 | 2022-06-24 | 青岛海尔空调电子有限公司 | Water chilling unit and control method thereof |
| CN111637611A (en) * | 2020-05-18 | 2020-09-08 | 珠海格力电器股份有限公司 | Water chilling unit control method and device, storage medium and water chilling unit |
| CN111637611B (en) * | 2020-05-18 | 2021-12-07 | 珠海格力电器股份有限公司 | Water chilling unit control method and device, storage medium and water chilling unit |
| CN112797607A (en) * | 2021-01-04 | 2021-05-14 | 珠海格力电器股份有限公司 | Heat recovery system, control method and air conditioning unit |
| CN112797607B (en) * | 2021-01-04 | 2023-02-24 | 珠海格力电器股份有限公司 | Heat recovery system, control method and air conditioning unit |
| CN113137713A (en) * | 2021-03-10 | 2021-07-20 | 青岛海尔空调电子有限公司 | Control method of air conditioning system and air conditioning system |
| CN113865004A (en) * | 2021-09-30 | 2021-12-31 | 珠海格力电器股份有限公司 | Cooling water anti-freezing control method, cooling water anti-freezing system and air conditioning system |
| CN114353382A (en) * | 2021-11-30 | 2022-04-15 | 青岛海尔空调电子有限公司 | Starting control method and device of air source heat pump unit and storage medium |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181012 |