CN218001824U - Low-temperature air source heat pump frequency conversion hot water system - Google Patents
Low-temperature air source heat pump frequency conversion hot water system Download PDFInfo
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- CN218001824U CN218001824U CN202220400113.0U CN202220400113U CN218001824U CN 218001824 U CN218001824 U CN 218001824U CN 202220400113 U CN202220400113 U CN 202220400113U CN 218001824 U CN218001824 U CN 218001824U
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Abstract
The utility model particularly relates to a low-temperature air source heat pump variable frequency hot water system, which comprises a low-temperature variable frequency compressor, a four-way reversing valve, a first heat exchanger, a liquid storage device, a flash tank and a second heat exchanger which are connected in sequence, and a circulation closed general loop is formed; the low-temperature air source heat pump variable-frequency hot water system also comprises an air supply branch, and the output end of the air supply branch is connected between the low-temperature variable-frequency compressor and the flash tank; the gas supplementing branch comprises a gas supplementing electromagnetic valve which is used for supplementing gaseous refrigerant emitted from the flash tank into the low-temperature variable-frequency compressor; the low-temperature air source heat pump variable-frequency hot water system can respectively switch a heating circulation mode and a defrosting circulation mode; the output capacity of the whole machine is increased.
Description
Technical Field
The utility model belongs to the technical field of air source heat pump, concretely relates to low temperature air source heat pump frequency conversion hot water system.
Background
Commercial heat pump water heater in air source on the existing market, normal atmospheric temperature water heater adopt the normal atmospheric temperature compressor of deciding frequently mostly, and a small number adopts normal atmospheric temperature inverter compressor, and low temperature water heater adopts the low temperature compressor of deciding frequency band tonifying qi mostly, but both have a limitation, and low temperature product normal atmospheric temperature operation is not high-efficient, and normal atmospheric temperature product low temperature heats the problem that the ability is low.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low temperature air source heat pump frequency conversion hot-water heating system, the normal atmospheric temperature operating mode heats the high efficiency, and low temperature operating mode ability decay reduces, and the four seasons is energy-conserving not restricted (the summer in the north looks like high efficiency), and north and south is less than the environment and does not have the restriction (the same energy-conserving in winter in the south).
In order to achieve the purpose, the main technical solution of the present invention is a low-temperature air source heat pump variable-frequency hot water system, which comprises a low-temperature variable-frequency compressor, a four-way reversing valve, a first heat exchanger, a reservoir, a flash tank and a second heat exchanger, which are connected in sequence, and form a closed circulation main loop; the low-temperature air source heat pump variable-frequency hot water system also comprises an air supply branch, and the output end of the air supply branch is connected between the low-temperature variable-frequency compressor and the flash tank; the gas supplementing branch comprises a gas supplementing electromagnetic valve which is used for supplementing gaseous refrigerant emitted from the flash tank into the low-temperature variable-frequency compressor; the low-temperature air source heat pump variable-frequency hot water system can respectively switch a heating circulation mode and a defrosting circulation mode.
In some examples, a first throttling valve for controlling the air supplement amount in low-temperature operation is arranged on a pipeline between the flash tank and the reservoir; and a second throttling valve used for controlling the refrigerant quantity is arranged on a pipeline between the flash tank and the second heat exchanger.
In some examples, when the low-temperature air source heat pump variable-frequency hot water system is in a heating circulation mode, the refrigerant flow direction path of the low-temperature air source heat pump variable-frequency hot water system sequentially passes through the low-temperature variable-frequency compressor, the four-way reversing valve, the first heat exchanger, the accumulator, the first throttling valve, the flash tank, the second throttling valve, the second heat exchanger, the four-way reversing valve and returns to the low-temperature variable-frequency compressor.
In some examples, the refrigerants in a gas-liquid mixed state flow through the flash tank and are separated from each other, and the path of the gaseous refrigerants is the flash tank, the gas supplementing branch and returns to the low-temperature variable-frequency compressor; the liquid refrigerant continues to flow into the second throttle valve pipeline.
In some examples, when the low-temperature air source heat pump variable-frequency hot water system is in a defrosting cycle mode, the refrigerant flow direction path of the low-temperature air source heat pump variable-frequency hot water system sequentially passes through the low-temperature variable-frequency compressor, the four-way reversing valve, the second heat exchanger, the second throttle valve, the flash tank, the first throttle valve, the accumulator, the first heat exchanger, the four-way reversing valve and returns to the low-temperature variable-frequency compressor.
In some examples, a check valve is disposed in the conduit of the first throttling valve.
In some examples, the low-temperature air source heat pump variable-frequency hot water system further comprises a loop temperature monitoring branch, the loop temperature monitoring branch is connected with pipelines at two ends of the second throttle valve in parallel, the loop temperature monitoring branch comprises a parallel electromagnetic valve and a throttling capillary tube, and when the temperature of the circulating pipeline is too high, the parallel electromagnetic valve and the throttling capillary tube are opened to increase the amount of circulating refrigerants.
In some examples, a fan is disposed on one side of the second heat exchanger.
In some examples, the second heat exchanger is a fin heat exchanger and the first heat exchanger is a coax-jacket heat exchanger.
In some examples, the first and second throttles are both electronic expansion valves.
The utility model discloses owing to adopted above technical scheme to realize following effect:
1. the energy efficiency of the unit is mainly improved under the premise of ensuring the capacity of the unit by operating at a normal temperature (20 ℃), wherein the compressor operates at a medium frequency (about 60HZ and the compressor has the highest energy efficiency), the air supply electromagnetic valve is closed (the air supply function is closed), the parallel electromagnetic valve is closed, and the fan operates at a low rotating speed.
2. The low-temperature heating working condition (7 ℃) runs, the unit capacity is mainly improved, at the moment, the compressor runs at high frequency, the air supplementing electromagnetic valve is opened (the middle air supplementing flash tank works to increase the unit capacity), the parallel electromagnetic valve is closed, and the fan runs at high rotating speed.
3. In the defrosting working condition (refrigeration) operation, because the system is provided with the two-stage throttle valve, in order to quickly defrost, the one-way valve (only used in defrosting operation) is connected in parallel at the position of the one-stage throttle valve and is used for increasing the flow of the circulating refrigerant in defrosting and quickly defrosting.
4. When the ultra-high temperature heating working condition (more than 30 ℃) is operated, the parallel electromagnetic valve at the secondary throttle valve is opened, the refrigerant flow at the secondary throttle position is increased, and the operation requirement of the unit is met.
Drawings
Figure 1 is a schematic structural view of an embodiment of the present invention,
in the figure: the system comprises a low-temperature variable-frequency compressor 1, a fan 2, a finned heat exchanger 3, a coaxial sleeve heat exchanger 4, a four-way reversing valve 5, a first throttling valve 6, a second throttling valve 7, a flash tank 8, an air supply electromagnetic valve 9, a parallel electromagnetic valve 10, a throttling capillary tube 11, a one-way valve 12 and a liquid storage device 13.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms are not to be construed as limiting the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., the number of an element can be one in one embodiment and the number of such elements can be plural in other embodiments, and the terms "a" and "an" should not be interpreted as limiting the number.
The first embodiment is as follows:
referring to fig. 1 of the drawings of the specification, a low-temperature air source heat pump variable-frequency hot water system according to a preferred embodiment of the invention comprises a low-temperature variable-frequency compressor 1, a four-way reversing valve 5, a first heat exchanger, a reservoir 13, a flash tank 8 and a second heat exchanger which are connected in sequence, and a circulating closed total loop is formed; the low-temperature air source heat pump variable-frequency hot water system also comprises an air supply branch, and the output end of the air supply branch is connected between the low-temperature variable-frequency compressor 1 and the flash tank 8; the air supplementing branch comprises an air supplementing electromagnetic valve 9 which is used for supplementing gaseous refrigerant emitted from the flash tank 8 into the low-temperature variable-frequency compressor 1; the low-temperature air source heat pump variable-frequency hot water system can respectively switch and start a heating circulation mode and a defrosting circulation mode; the invention adopts a low-temperature frequency conversion compressor 1, the low-temperature frequency conversion compressor can run at low frequency under the normal-temperature working condition, the compressor has high efficiency and can achieve the energy-saving effect, under the normal-temperature working condition, the unit has more heat absorption capacity in the air, large refrigerant circulation capacity and high unit output capacity, but the unit output capacity is gradually reduced along with the environmental temperature, in addition, the heat absorption capacity of the unit in the air is preliminarily reduced, the refrigerant circulation capacity is reduced, the compressor output capacity is also reduced, and through the action of a flash tank 8, the continuous circulation refrigerant quantity can be effectively improved, the compressor output capacity is increased, and the whole flash tank output capacity is increased.
Specifically, in this embodiment, a first throttle valve 6 for controlling the amount of make-up air during low temperature operation is disposed on a pipeline between the flash tank 8 and the reservoir 13; and a second throttling valve 7 for controlling the refrigerant quantity is arranged on a pipeline between the flash tank 8 and the second heat exchanger, wherein the first throttling valve 6 and the second throttling valve 7 are electronic expansion valves, the control of the first throttling valve and the second throttling valve is required to ensure that the refrigerant entering the compressor is a gaseous refrigerant, and the other function of the throttling valves is also throttling and depressurizing.
When a user opens the low-temperature air source heat pump variable-frequency hot water system in a heating circulation mode, the refrigerant flow direction path sequentially passes through the low-temperature variable-frequency compressor 1, the four-way reversing valve 5, the first heat exchanger, the liquid storage device 13, the first throttling valve 6, the flash tank 8, the second throttling valve 7, the second heat exchanger, the four-way reversing valve 5 and returns to the low-temperature variable-frequency compressor 1, when gaseous refrigerant flows through the flash tank 8, the flash tank 8 can enable the gaseous refrigerant to form liquid refrigerant, the liquid refrigerant continuously flows to the pipeline of the second throttling valve 7, the gaseous refrigerant returns to the low-temperature variable-frequency compressor 1 from the air supplementing branch, and the refrigerant can be separated from gas and liquid quickly through the flash tank 8, so that the operation efficiency is improved; when a user opens the low-temperature air source heat pump variable-frequency hot water system and is in a defrosting circulation mode, the refrigerant flow direction path sequentially passes through the low-temperature variable-frequency compressor 1, the four-way reversing valve 5, the second heat exchanger, the second throttle valve 7, the flash tank 8, the first throttle valve 6, the liquid storage device 13, the first heat exchanger, the four-way reversing valve 5 and returns to the low-temperature variable-frequency compressor 1.
According to the technical scheme, under the condition that the refrigerant quantity needs to be increased in order to adapt to the working condition of rising of the loop temperature, the low-temperature air source heat pump variable-frequency hot water system further comprises a loop temperature monitoring branch, the loop temperature monitoring branch is connected with pipelines at two ends of the second throttling valve 7 in parallel, the loop temperature monitoring branch comprises a parallel electromagnetic valve 10 and a throttling capillary tube 11, and when the temperature of a circulating pipeline is too high, the parallel electromagnetic valve 10 and the throttling capillary tube 11 are opened to increase the circulating refrigerant quantity; specifically, when the loop temperature is high, the heat absorption capacity of the refrigerant in the fin heat exchanger 3 is increased, so that the required refrigerant amount is increased, the original secondary throttling valve cannot meet the circulating refrigerant amount at the moment, and at the moment, the parallel electromagnetic valve 10 is opened when the loop temperature is high, works together with the throttling capillary tube 11 connected in series, and increases the circulating refrigerant amount at the secondary throttling position.
In addition, in this embodiment, a fan 2 is disposed on one side of the second heat exchanger, and the fan 2 is used to accelerate disturbance of air around the unit and increase heat absorption capacity. The second heat exchanger is a finned heat exchanger 3, the finned heat exchanger 3 is good and stable in heat transfer performance due to the fact that the contact area between radiating fins and radiating pipes is large and tight, air passing resistance is small, steam or hot water flows through the inside of a steel pipe, heat is transferred to air passing through the fins tightly wound on the steel pipe, and the effect of heating and cooling the air is achieved; the first heat exchanger is a coaxial double-pipe heat exchanger 4, compared with other heat exchangers, the coaxial double-pipe heat exchanger 4 is pressure-resistant and shock-resistant, not prone to deformation, dirt and scale, not prone to blocking, smooth in oil return, good in safety and manufacturability, not prone to leakage, flexible in structure, convenient to arrange, low in price and capable of saving cost, and is particularly suitable for a heat pump system. In addition, the first throttle 6 and the second throttle 7 are both electronic expansion valves.
The low-temperature air source heat pump variable-frequency hot water system specifically operates as follows:
when a user opens the low-temperature air source heat pump variable-frequency hot water system in a heating circulation mode, a refrigerant applies work through a low-temperature variable-frequency compressor 1 to form a high-temperature high-pressure gaseous refrigerant, the gaseous refrigerant passes through a four-way reversing valve 5 to be heated in a coaxial sleeve heat exchanger 4, after water is heated, the gaseous refrigerant is mixed with high-pressure medium-temperature gaseous liquid, when a unit operates at a low temperature through a liquid storage device 13, the quantity of the system circulation refrigerant is reduced, at the moment, the liquid storage device 13 is used for storing the refrigerant and then is diffused into a gas-liquid two-phase refrigerant in a flash tank 8 through a first-stage throttle valve, wherein the gaseous refrigerant flows to a compressor air supplement port after being opened at a low temperature through an air supplement electromagnetic valve 9, and the flow of the system circulation refrigerant is increased, so that the capacity of the unit is increased; the liquid refrigerant is further throttled and depressurized through the second-stage throttle valve to become a liquid refrigerant with lower temperature and lower pressure, enters the finned heat exchanger 3 to absorb heat in air, returns to the compressor through the four-way reversing valve 5 to continue to do work, and completes the heating cycle.
When a user opens the low-temperature air source heat pump variable-frequency hot water system in a defrosting circulation mode, when the environment temperature is low and the air humidity is high, the finned heat exchanger 3 can frost to reduce the heat absorption capacity, at the moment, the defrosting mode needs to be entered, under the mode, the refrigerant also works in the low-temperature variable-frequency compressor 1 to become a high-temperature high-pressure gaseous refrigerant, the refrigerant passes through the four-way reversing valve 5 to reach the finned heat exchanger 3 to remove frost on fins, and then returns to the compressor through the two-stage throttling valve, the flash tank 8, the one-stage throttling valve, the liquid reservoir 13, the coaxial sleeve heat exchanger 4 and the four-way reversing valve 5 in sequence to complete a defrosting circulation.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention.
The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (10)
1. A low-temperature air source heat pump variable-frequency hot water system is characterized by comprising a low-temperature variable-frequency compressor (1), a four-way reversing valve (5), a first heat exchanger, a liquid storage device (13), a flash tank (8) and a second heat exchanger which are sequentially connected, and a circulating closed total loop is formed; the low-temperature air source heat pump variable-frequency hot water system further comprises an air supplementing branch, and the output end of the air supplementing branch is connected between the low-temperature variable-frequency compressor (1) and the flash tank (8); the air supplementing branch comprises an air supplementing electromagnetic valve (9) which is used for supplementing gaseous refrigerant emitted from the flash tank (8) into the low-temperature variable-frequency compressor (1); the low-temperature air source heat pump variable-frequency hot water system can respectively switch and start a heating circulation mode and a defrosting circulation mode.
2. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 1, wherein a first throttle valve (6) for controlling the air compensation amount during low-temperature operation is arranged on a pipeline between the flash tank (8) and the liquid reservoir (13); and a second throttling valve (7) used for controlling the refrigerant quantity is arranged on a pipeline between the flash tank (8) and the second heat exchanger.
3. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 2, wherein when the low-temperature air source heat pump variable-frequency hot water system is in a heating circulation mode, a refrigerant flow path sequentially passes through the low-temperature variable-frequency compressor (1), the four-way reversing valve (5), the first heat exchanger, the liquid reservoir (13), the first throttle valve (6), the flash tank (8), the second throttle valve (7), the second heat exchanger, the four-way reversing valve (5) and returns to the low-temperature variable-frequency compressor (1).
4. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 3, wherein the refrigerant in a gas-liquid mixed state flows through the flash tank (8) and then is separated from the refrigerant, and the path of the gaseous refrigerant is the flash tank (8), the gas supplementing branch and returns to the low-temperature variable-frequency compressor (1); and the liquid refrigerant continues to flow into the pipeline of the second throttle valve (7).
5. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 2, wherein when the low-temperature air source heat pump variable-frequency hot water system is in a defrosting circulation mode, a refrigerant flow path sequentially passes through the low-temperature variable-frequency compressor (1), the four-way reversing valve (5), the second heat exchanger, the second throttle valve (7), the flash tank (8), the first throttle valve (6), the liquid reservoir (13), the first heat exchanger, the four-way reversing valve (5) and returns to the low-temperature variable-frequency compressor (1).
6. The variable-frequency hot water system of the low-temperature air source heat pump as claimed in claim 5, characterized in that a one-way valve (12) is arranged on the pipeline of the first throttle valve (6).
7. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 2, further comprising a loop temperature monitoring branch, wherein the loop temperature monitoring branch is connected in parallel with pipelines at two ends of the second throttle valve (7), the loop temperature monitoring branch comprises a parallel electromagnetic valve (10) and a throttling capillary tube (11), and when the temperature of the circulating pipeline is too high, the parallel electromagnetic valve (10) and the throttling capillary tube (11) are opened to increase the amount of circulating refrigerant.
8. The low-temperature air source heat pump variable-frequency hot water system as claimed in claim 1, wherein a fan (2) is arranged on one side of the second heat exchanger.
9. A low-temperature air source heat pump variable-frequency hot water system as claimed in any one of claims 1 to 8, wherein the second heat exchanger is a fin heat exchanger (3) and the first heat exchanger is a coaxial double-pipe heat exchanger (4).
10. A low-temperature air source heat pump variable-frequency hot water system according to any one of claims 2 to 8, wherein the first throttling valve (6) and the second throttling valve (7) are electronic expansion valves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220400113.0U CN218001824U (en) | 2022-02-24 | 2022-02-24 | Low-temperature air source heat pump frequency conversion hot water system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220400113.0U CN218001824U (en) | 2022-02-24 | 2022-02-24 | Low-temperature air source heat pump frequency conversion hot water system |
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| CN218001824U true CN218001824U (en) | 2022-12-09 |
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| CN202220400113.0U Active CN218001824U (en) | 2022-02-24 | 2022-02-24 | Low-temperature air source heat pump frequency conversion hot water system |
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