CN207540181U - A kind of Gas-supplying enthalpy-increasing system of economizer - Google Patents
A kind of Gas-supplying enthalpy-increasing system of economizer Download PDFInfo
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- CN207540181U CN207540181U CN201721089004.7U CN201721089004U CN207540181U CN 207540181 U CN207540181 U CN 207540181U CN 201721089004 U CN201721089004 U CN 201721089004U CN 207540181 U CN207540181 U CN 207540181U
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Abstract
The utility model is related to heat pump air conditioner technical fields, specifically be a kind of economizer Gas-supplying enthalpy-increasing system and its control method, Gas-supplying enthalpy-increasing system include Gas-supplying enthalpy-increasing compressor (1), four-way valve (2), water-side heat (3), air-side heat exchanger (4), economizer (5), solenoid valve (6), the first electric expansion valve (7) and the second electric expansion valve (8)；The first outlet (14) of economizer (5) is connect by the first electric expansion valve (7) with the one end of air-side heat exchanger (4) far from four-way valve (2), and the second outlet (15) of economizer (5) is connect by the pipeline between the second electric expansion valve (8) and the first outlet (14) of economizer (5) and the first electric expansion valve (7).A kind of flow of convenient, the reasonable control economizer heat exchange medium of energy is provided so as to ensure the Gas-supplying enthalpy-increasing system of the economizer of reliable operation.
Description
Technical field
The utility model is related to heat pump air conditioner technical field, specifically be a kind of economizer Gas-supplying enthalpy-increasing system.
Background technology
As northern coal changes the progress of electricity, the usage amount of the air source heat pump water dispenser of low form is increasing, northern area
Since winter area surroundings temperature is relatively low, air source heat pump producer uses the compressor of low form, in the pressure of low form
What use was most wide inside contracting machine is exactly Gas-supplying enthalpy-increasing compressor, and such compressor adds the mode of second vapor injection by using economizer
The problem of high heat exchange amount of heat pump unit delivery temperature is low under low circumstance temperature is overcome well.
But the Gas-supplying enthalpy-increasing system of economizer of the prior art is unreasonable due to designing Gas-supplying enthalpy-increasing system, causes
Occurs the situation of a large amount of compressor damage in the market, the heating for having seriously affected user uses.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of energy and conveniently, rationally economizer heat exchange is controlled to be situated between
The flow of matter is so as to ensure the Gas-supplying enthalpy-increasing system of the economizer of reliable operation.
In order to solve the above technical problems, a kind of Gas-supplying enthalpy-increasing system of economizer of the utility model, including Gas-supplying enthalpy-increasing
Compressor, four-way valve, water-side heat, air-side heat exchanger, economizer, solenoid valve, the first electric expansion valve and the second electronics
Expansion valve；It is characterized in that, the exhaust outlet of the Gas-supplying enthalpy-increasing compressor connect with four-way valve after respectively with water-side heat, sky
The air entry of gas side heat exchanger and Gas-supplying enthalpy-increasing compressor connects, the first import of the other end and economizer of water-side heat
Connection, the second import of economizer are connect by solenoid valve with the gas supplementing opening of Gas-supplying enthalpy-increasing compressor, the first outlet of economizer
It is connect by the first electric expansion valve with the one end of air-side heat exchanger far from four-way valve, the second outlet of economizer passes through second
Pipeline connection between the first outlet and the first electric expansion valve of electric expansion valve and economizer.
Preferably, a kind of Gas-supplying enthalpy-increasing system of economizer further includes
First temperature sensor, for detecting the temperature in the pipeline between the exhaust outlet of Gas-supplying enthalpy-increasing compressor and four-way valve
Angle value T1 simultaneously forms temperature signal；
Second temperature sensor, for detecting the temperature in the pipeline between solenoid valve and the gas supplementing opening of Gas-supplying enthalpy-increasing compressor
Angle value T2 simultaneously forms temperature signal；
Third temperature sensor, for detecting in the pipeline between the second outlet of economizer and the second electric expansion valve
Temperature value T3 simultaneously forms temperature signal；
Signal receives processing and control module, for receiving the first temperature sensor, second temperature sensor and third
The temperature signal of temperature sensor, and according to the first temperature sensor, second temperature sensor and third temperature sensor
Temperature signal judge whether to meet the condition of the first electric expansion valve of regulation and control, the second electric expansion valve and solenoid valve, if meeting
Regulate and control the first electric expansion valve, the second electric expansion valve and solenoid valve condition, then signal receives processing and control module to first
Electric expansion valve, the second electric expansion valve and solenoid valve send out corresponding control signal；
Signal receives processing and control module and is passed respectively with the first temperature sensor, second temperature sensor, third temperature
Sensor, solenoid valve, the first electric expansion valve and the electrical connection of the second electric expansion valve.
Preferably, the temperature according to the first temperature sensor, second temperature sensor and third temperature sensor
Signal judges whether to meet the condition of the first electric expansion valve of regulation and control, the second electric expansion valve and solenoid valve, if meeting regulation and control the
One electric expansion valve, the second electric expansion valve and solenoid valve condition, then signal receives processing and control module is swollen to the second electronics
Swollen valve and solenoid valve send out corresponding control signal and refer to：
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve and closing the second electronic expansion
Valve；
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to close solenoid valve and closing the second electronic expansion
Valve；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve and opening the second electronics
Expansion valve to X walk aperture；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve and opening the second electronics
Expansion valve is to X-5- (T2-T3) step aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 20 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve and opening the second electronics
Expansion valve is to -20 step apertures of X+ (T2-T3)；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of 20 DEG C of ＜ T2-T3 ＜, then signal is controlled to open solenoid valve and opening the
Two electric expansion valves to X walk aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve and opening the second electronics
Expansion valve is to X-5- (T2-T3) step aperture；
As 105 DEG C of T1 ＞, and 5 DEG C of T2-T3 ＜, then signal is controlled to open the first electric expansion valve of solenoid valve and increase
Aperture (T1-105) step, open the second electric expansion valve 8 to X walk aperture；
Wherein, the value of X is the integer between 55 to 65.For example, the value of X can be 55, can also be 65, can also be 56
Or 57 or 58 or 59 or 60 or 61 or 62 or 63 or 64.
With the above structure, it has the following advantages that：
1. the first outlet due to economizer passes through one of the first electric expansion valve and air-side heat exchanger far from four-way valve
End connection, the second outlet of economizer by the first outlet and the first electric expansion valve of the second electric expansion valve and economizer it
Between pipeline connection, in this way, the first electric expansion valve, the second electric expansion valve mating reaction under, can facilitate control heat
Exchange media enters the flow of economizer, so as to ensure that the flow of heat exchange medium is reasonable, so as to ensure Gas-supplying enthalpy-increasing compressor
Reliability.Heat exchange medium can be refrigerant.
2. solenoid valve has the function of flow break-make, ensure to be not in back the situation of liquid during compressor operating, so as to ensure
The reliability of Gas-supplying enthalpy-increasing compressor.
3. in the temperature detection effect of the first temperature sensor, second temperature sensor, third temperature sensor and signal
Receive processing and control module signal processing and control under the action of so that the first electric expansion valve, the second electric expansion valve,
The control of solenoid valve is reasonable, is further ensured that the reliability of Gas-supplying enthalpy-increasing compressor.
Description of the drawings
Fig. 1 is a kind of structure diagram of the Gas-supplying enthalpy-increasing system of economizer of the utility model.
Fig. 2 is a kind of electrical connection schematic diagram of the Gas-supplying enthalpy-increasing system of economizer of the utility model.
Fig. 3 is a kind of flow diagram of the control method of the Gas-supplying enthalpy-increasing system of economizer of the utility model.
Wherein：
1st, Gas-supplying enthalpy-increasing compressor；2nd, four-way valve；3rd, water-side heat；4th, air-side heat exchanger；5th, economizer；6th, electromagnetism
Valve；7th, the first electric expansion valve；8th, the second electric expansion valve；9th, exhaust outlet；10th, air entry；11st, the first import；12nd, second into
Mouthful；13rd, gas supplementing opening；14th, first outlet；15th, second outlet；16th, the first temperature sensor；17th, second temperature sensor；18、
Third temperature sensor.
Specific embodiment
The essence that those skilled in the art convey them to work to others skilled in the art is will hereinafter use to lead to
The term often used describes the utility model concept of the disclosure.However, these utility model concepts can be presented as many differences
Form, thus should not be considered limited to embodiments described herein.These embodiments are provided so that present disclosure more
It is detailed and complete, and its range included is completely conveyed to those skilled in the art.It must also be noted that these embodiments not phase
Mutually repel.Component, step or element from one embodiment may be assumed that into may be present or uses in another embodiment.Not
In the case of the range for being detached from embodiment of the disclosure, institute can be substituted with diversified alternative and/or equivalent implementations
The specific embodiment for showing and describing.The application is intended to any modification or modification of covering embodiments discussed herein.For this
Significantly alternative embodiment can be put into practice for the technical staff in field using only some aspects in described aspect.Herein
For purposes of illustration, specific number, material and configuration are described in embodiment, however, the technical staff in field is not having
In the case of there are these specific details, alternative embodiment can also be put into practice.In other cases, crowd may be omitted or simplified
Well known feature, so as not to which illustrative embodiment is made to be difficult to understand.
In addition, term " first ", " second ", " third " are only used for description purpose, and it is not intended that instruction or implying phase
To importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is set
Have ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected,
Or it is integrally connected；Can be mechanical connection or electrical connection；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, it can be managed with concrete condition
Solve concrete meaning of the above-mentioned term in the utility model.
Such as Fig. 1-3, in one embodiment, a kind of Gas-supplying enthalpy-increasing system of economizer, including Gas-supplying enthalpy-increasing compressor 1,
Four-way valve 2, water-side heat 3, air-side heat exchanger 4, economizer 5, solenoid valve 6, the first electric expansion valve 7 and the second electronics are swollen
Swollen valve 8；It is characterized in that, the exhaust outlet 9 of the Gas-supplying enthalpy-increasing compressor 1 connect with four-way valve 2 after respectively with water-side heat
3rd, the air entry 10 of air-side heat exchanger 4 and Gas-supplying enthalpy-increasing compressor 1 connects, the other end and the economizer 5 of water-side heat 3
The first import 11 connect, the second import 12 of economizer 5 is connected by solenoid valve 6 and the gas supplementing opening 13 of Gas-supplying enthalpy-increasing compressor 1
It connects, the first outlet 14 of economizer 5 is connected by the first electric expansion valve 7 and the one end of air-side heat exchanger 4 far from four-way valve 2
It connects, the second outlet 15 of economizer 5 passes through 14 and first electronic expansion of first outlet of the second electric expansion valve 8 and economizer 5
Pipeline connection between valve 7.
A kind of Gas-supplying enthalpy-increasing system of economizer further includes
First temperature sensor 16, for detecting the pipeline between the exhaust outlet 9 of Gas-supplying enthalpy-increasing compressor 1 and four-way valve 2
Interior temperature value T1 simultaneously forms temperature signal；
Second temperature sensor 17, for detecting the pipeline between solenoid valve 6 and the gas supplementing opening 13 of Gas-supplying enthalpy-increasing compressor 1
Interior temperature value T2 simultaneously forms temperature signal；
Third temperature sensor 18, for detecting the pipe between 15 and second electric expansion valve 8 of second outlet of economizer 5
Temperature value T3 in road simultaneously forms temperature signal；
Signal receive processing and control module, for receive the first temperature sensor 16, second temperature sensor 17 and
The temperature signal of third temperature sensor 18, and according to the first temperature sensor 16, second temperature sensor 17 and third
The temperature signal of temperature sensor 18 judges whether to meet the first electric expansion valve 7 of regulation and control, the second electric expansion valve 8 and solenoid valve
6 condition, if meeting regulation and control 6 condition of the first electric expansion valve 7, the second electric expansion valve 8 and solenoid valve, signal reception processing
With control module corresponding control signal is sent out to the first electric expansion valve 7, the second electric expansion valve 8 and solenoid valve 6；
Signal receive processing and control module respectively with the first temperature sensor 16, second temperature sensor 17, third temperature
Degree sensor 18, solenoid valve 6, the first electric expansion valve 7 and the second electric expansion valve 8 are electrically connected.
It is described to be believed according to the temperature of the first temperature sensor 16, second temperature sensor 17 and third temperature sensor 18
Number judge whether the condition for meeting the first electric expansion valve 7 of regulation and control, the second electric expansion valve 8 and solenoid valve 6, if meeting regulation and control the
6 condition of one electric expansion valve 7, the second electric expansion valve 8 and solenoid valve, then signal receive processing and control module to the second electronics
Expansion valve 8 and solenoid valve 6 send out corresponding control signal and refer to：
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and closing the second electronic expansion
Valve 8；
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to close solenoid valve 6 and closing the second electronic expansion
Valve 8；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 to X walk aperture；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 is to X-5- (T2-T3) step aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 20 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 is to -20 step apertures of X+ (T2-T3)；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of 20 DEG C of ＜ T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the
Two electric expansion valves 8 to X walk aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the second electronics
Expansion valve 8 is to X-5- (T2-T3) step aperture；
As 105 DEG C of T1 ＞, and 5 DEG C of T2-T3 ＜, then signal is controlled to open the first electric expansion valve of solenoid valve 6 and increase
7 aperture (T1-105) step opens the second electric expansion valve 8 to X step apertures；
Wherein, the value of X is the integer between 55 to 65.For example, the value of X can be 55, can also be 65, can also be 56
Or 57 or 58 or 59 or 60 or 61 or 62 or 63 or 64.
In addition, a kind of control method of the Gas-supplying enthalpy-increasing system the invention also discloses economizer, it includes as follows
Step：
S1：In pipeline between the exhaust outlet 9 of first temperature sensor 16 detection Gas-supplying enthalpy-increasing compressor 1 and four-way valve 2
Temperature value T1 and form temperature signal；Second temperature sensor 17 detects the gas supplementing opening of solenoid valve 6 and Gas-supplying enthalpy-increasing compressor 1
Temperature value T2 in pipeline between 13 simultaneously forms temperature signal；Third temperature sensor 18 detects the second outlet of economizer 5
The 15 and temperature value T3 in the second pipeline between electric expansion valve 8 simultaneously forms temperature signal；
S2：Signal receives processing and control module receives the first temperature sensor 16, second temperature sensor 17 and the
The temperature signal of three-temperature sensor 18, and according to the first temperature sensor 16, second temperature sensor 17 and third temperature
The temperature signal of degree sensor 18 judges whether to meet the first electric expansion valve 7 of regulation and control, the second electric expansion valve 8 and solenoid valve 6
Condition, if meet regulation and control 6 condition of the first electric expansion valve 7, the second electric expansion valve 8 and solenoid valve, signal reception processing
With control module corresponding control signal is sent out to the first electric expansion valve 7, the second electric expansion valve 8 and solenoid valve 6；
S3：First electric expansion valve 7, the second electric expansion valve 8 and solenoid valve 6 receive signal and receive processing and control module
Control signal and make respective action.
It is described to be believed according to the temperature of the first temperature sensor 16, second temperature sensor 17 and third temperature sensor 18
Number judge whether the condition for meeting the first electric expansion valve 7 of regulation and control, the second electric expansion valve 8 and solenoid valve 6, if meeting regulation and control the
6 condition of one electric expansion valve 7, the second electric expansion valve 8 and solenoid valve, then signal receive processing and control module to the first electronics
Expansion valve 7, the second electric expansion valve 8 and solenoid valve 6 send out corresponding control signal and refer to：
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and closing the second electronic expansion
Valve 8；
As 85 DEG C of T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to close solenoid valve 6 and closing the second electronic expansion
Valve 8；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 to X walk aperture；
As 85 DEG C of 95 DEG C of ＜ T1 ＜, and during 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 is to X-5- (T2-T3) step aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 20 DEG C of T2-T3 ＞, then signal is controlled to open solenoid valve 6 and opening the second electricity
Sub- expansion valve 8 is to -20 step apertures of X+ (T2-T3)；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of 20 DEG C of ＜ T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the
Two electric expansion valves 8 to X walk aperture；
As 95 DEG C of 105 DEG C of ＜ T1 ＜, and 5 DEG C of T2-T3 ＜, then signal is controlled to open solenoid valve 6 and opening the second electronics
Expansion valve 8 is to X-5- (T2-T3) step aperture；
As 105 DEG C of T1 ＞, and 5 DEG C of T2-T3 ＜, then signal is controlled to open the first electric expansion valve of solenoid valve 6 and increase
7 (T1-105) step apertures open the second electric expansion valve 8 to X step apertures；
Wherein, the value of X is the integer between 55 to 65, for example, the value of X can be 55, can also be 65, can also be 56
Or 57 or 58 or 59 or 60 or 61 or 62 or 63 or 64.
Preferably, judge whether to meet the first electric expansion valve 7 of regulation and control, the second electric expansion valve 8 and electromagnetism in step S2
The period of the condition of valve 6 is 50~70 seconds.For example, the period can be either 70 seconds or 60 seconds 50 seconds.
By the above method, in the first temperature sensor, second temperature sensor, the temperature detection of third temperature sensor
Under the action of effect receives signal processing and the control of processing and control module with signal, in different temperature sections, the first electricity
Sub- expansion valve, the second electric expansion valve, solenoid valve make corresponding action according to the variation of temperature so that the first electronic expansion
Valve, the second electric expansion valve, the control of solenoid valve are reasonable, so as to ensure that the flow of heat exchange medium is reasonable, so as to further protect
Demonstrate,prove the reliability of Gas-supplying enthalpy-increasing compressor.
The above is only the preferably feasible implementation example of the utility model, it is impossible to therefore limit to the utility model
Interest field, it is for those skilled in the art, all to be made with the technical solution of the utility model and technical concept
Other it is various it is corresponding change should all belong within the protection domain of the utility model claims.
Claims (2)
1. a kind of Gas-supplying enthalpy-increasing system of economizer, including Gas-supplying enthalpy-increasing compressor (1), four-way valve (2), water-side heat (3),
Air-side heat exchanger (4), economizer (5), solenoid valve (6), the first electric expansion valve (7) and the second electric expansion valve (8)；It is special
Sign is, the exhaust outlet (9) of the Gas-supplying enthalpy-increasing compressor (1) connect with four-way valve (2) after respectively with water-side heat (3),
The air entry (10) of air-side heat exchanger (4) and Gas-supplying enthalpy-increasing compressor (1) connect, the other end of water-side heat (3) with
The first import (11) connection of economizer (5), the second import (12) of economizer (5) pass through solenoid valve (6) and Gas-supplying enthalpy-increasing pressure
Gas supplementing opening (13) connection of contracting machine (1), the first outlet (14) of economizer (5) pass through the first electric expansion valve (7) and air side
The one end of heat exchanger (4) far from four-way valve (2) connects, and the second outlet (15) of economizer (5) passes through the second electric expansion valve (8)
Pipeline between the first outlet (14) of economizer (5) and the first electric expansion valve (7) is connect.
2. the Gas-supplying enthalpy-increasing system of a kind of economizer described in accordance with the claim 1, which is characterized in that a kind of economizer
Gas-supplying enthalpy-increasing system further includes
First temperature sensor (16), for detecting between the exhaust outlet of Gas-supplying enthalpy-increasing compressor (1) (9) and four-way valve (2)
Temperature value T1 in pipeline simultaneously forms temperature signal；
Second temperature sensor (17), for detecting between solenoid valve (6) and the gas supplementing opening (13) of Gas-supplying enthalpy-increasing compressor (1)
Temperature value T2 in pipeline simultaneously forms temperature signal；
Third temperature sensor (18), for detecting between the second outlet of economizer (5) (15) and the second electric expansion valve (8)
Pipeline in temperature value T3 and form temperature signal；
Signal receive processing and control module, for receive the first temperature sensor (16), second temperature sensor (17) and
The temperature signal of third temperature sensor (18), and according to the first temperature sensor (16), second temperature sensor (17) with
And the temperature signal of third temperature sensor (18) judges whether to meet the first electric expansion valve of regulation and control (7), the second electronic expansion
The condition of valve (8) and solenoid valve (6), if meeting the first electric expansion valve of regulation and control (7), the second electric expansion valve (8) and solenoid valve
(6) condition, then signal receives processing and control module sends out corresponding control to the second electric expansion valve (8) and solenoid valve (6)
Signal；
Signal receive processing and control module respectively with the first temperature sensor (16), second temperature sensor (17), third temperature
Spend sensor (18), solenoid valve (6), the first electric expansion valve (7) and the second electric expansion valve (8) electrical connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721089004.7U CN207540181U (en) | 2017-08-29 | 2017-08-29 | A kind of Gas-supplying enthalpy-increasing system of economizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721089004.7U CN207540181U (en) | 2017-08-29 | 2017-08-29 | A kind of Gas-supplying enthalpy-increasing system of economizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645736A (en) * | 2019-06-28 | 2020-01-03 | 江苏雪龙新能源科技有限公司 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
| CN115307352A (en) * | 2022-08-16 | 2022-11-08 | 四川长虹空调有限公司 | Double electronic expansion valve control method of air-supplementing enthalpy-increasing heat pump system |
-
2017
- 2017-08-29 CN CN201721089004.7U patent/CN207540181U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645736A (en) * | 2019-06-28 | 2020-01-03 | 江苏雪龙新能源科技有限公司 | Direct-current variable-frequency carbon dioxide heat pump cold and hot unit |
| CN115307352A (en) * | 2022-08-16 | 2022-11-08 | 四川长虹空调有限公司 | Double electronic expansion valve control method of air-supplementing enthalpy-increasing heat pump system |
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