Cascade type high-temperature air energy heat pump for low-temperature environment

Abstract

The utility model discloses a cascade type high-temperature air energy heat pump used in a low-temperature environment, which comprises a first air energy compressor and a second air energy compressor, the first air energy compressor comprises an evaporation heat exchanger, a liquid outlet of the evaporation heat exchanger is communicated with a liquid inlet of the second air energy compressor, and a liquid outlet of the evaporation heat exchanger is communicated with a liquid outlet of the second air energy compressor. And a liquid outlet of the second air energy compressor is communicated with a liquid inlet of the evaporation heat exchanger. Cascade compression is achieved through the first air energy compressor and the second air energy compressor, the evaporation heat exchanger of the first air energy compressor can ensure that the medium temperature of the second air energy compressor is kept constant, and the situation that the medium temperature of the second air energy compressor fluctuates in the low-temperature environment, and consequently energy consumption is increased is avoided; and the energy conversion value of the air energy heat pump in the low-temperature environment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air energy heat pumps, in particular to a cascade high-temperature air energy heat pump used in a low-temperature environment. Background Art

[0002] An air energy heat pump is a system that uses the heat in the air to heat or cool the indoor space. It absorbs and releases heat through the circulating refrigerant to achieve heating or cooling of the indoor air. The specific working principle is to compress the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure gas through a compressor, and then release heat to turn the refrigerant into a high-temperature and high-pressure gas. The high-temperature and high-pressure gas dissipates heat through the condenser, cools into a high-pressure liquid, and then decompresses into a low-temperature and low-pressure gas through an expansion valve to absorb the heat in the room. Through continuous reciprocating cycles, the effect of heating or cooling is achieved.

[0003] Air energy heat pump is an environmentally friendly, efficient and energy-saving heating and cooling system with high promotion value. However, the energy conversion value of existing air energy heat pumps in low temperature environments is low. Utility Model Content

[0004] The main purpose of the utility model is to provide a cascade high-temperature air energy heat pump for low-temperature environments, aiming to solve the technical problem of low energy conversion value of air energy heat pumps in low-temperature environments.

[0005] To achieve the above-mentioned objectives, the utility model proposes a cascade high-temperature air energy heat pump for use in a low-temperature environment, comprising a first air energy compressor and a second air energy compressor, wherein the first air energy compressor comprises an evaporative heat exchanger, the liquid outlet of the evaporative heat exchanger is connected to the liquid inlet of the second air energy compressor, and the liquid outlet of the second air energy compressor is connected to the liquid inlet of the evaporative heat exchanger.

[0006] In one embodiment of the utility model, the first air energy compressor also includes a first compressor, a first evaporator and a first liquid storage tank, the evaporative heat exchanger is connected to the liquid inlet of the first evaporator via the first liquid storage tank, and the liquid outlet of the evaporator is connected to the liquid inlet of the evaporative heat exchanger via the first compressor.

[0007] In an embodiment of the present utility model, the first liquid storage tank is connected to the liquid inlet of the first evaporator through an expansion valve.

[0008] In one embodiment of the utility model, the evaporative heat exchanger includes a first condenser, a second evaporator, a first heat exchange pipe and a second heat exchange pipe. The first heat exchange pipe is connected to the first condenser to realize heat exchange inside the first air energy compressor; the second heat exchange pipe is connected to the second evaporator and is connected to the second air energy compressor.

[0009] In an embodiment of the present invention, both the first condenser and the second evaporator are provided with aluminum heat conducting fins.

[0010] In an embodiment of the present invention, the power of the first compressor is 0.75KW to 1.5KW.

[0011] In one embodiment of the utility model, the second air energy compressor includes a second compressor, a second condenser and a second liquid storage tank, the liquid outlet of the second compressor is connected to the liquid inlet of the second condenser, the hot liquid outlet of the second condenser is connected to the liquid tank via a circulating pump, and the cold liquid outlet of the second condenser is connected to the evaporative heat exchanger via the second liquid storage tank.

[0012] In one embodiment of the present invention, an expansion valve is provided at the liquid outlet of the second liquid storage tank.

[0013] In an embodiment of the present invention, the power of the second compressor is 1.5KW to 2.5KW.

[0014] The technical solution of the utility model arranges a first air energy compressor and a second air energy compressor to realize cascade compression. The evaporative heat exchanger of the first air energy compressor can ensure that the medium temperature of the second air energy compressor remains constant, thereby avoiding the defect of the second air energy compressor causing medium temperature fluctuations in a low temperature environment, thereby increasing energy consumption and ultimately having a low energy conversion value, thereby improving the energy conversion value of the air energy heat pump in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 This is a principle block diagram of an embodiment of a cascade high-temperature air energy heat pump for low-temperature environments of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the evaporative heat exchanger of the utility model.

[0018] In the figure:

[0019] 100-first air energy compressor, 110-evaporative heat exchanger, 111-first condenser, 112-second evaporator, 113-first heat exchange pipe, 114-second heat exchange pipe, 120-first compressor, 130-first evaporator, 140-first liquid storage tank, 200-second air energy compressor, 210-second compressor, 220-second condenser, 230-second liquid storage tank.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0025] Figure 1 The schematic diagram of an embodiment of a cascade high-temperature air energy heat pump for low-temperature environment of the utility model is shown in FIG. Figure 1 As shown, the utility model proposes a cascade high-temperature air energy heat pump for low-temperature environment, including a first air energy compressor 100 and a second air energy compressor 200, wherein the first air energy compressor 100 includes an evaporative heat exchanger 110, the liquid outlet of the evaporative heat exchanger 110 is connected to the liquid inlet of the second air energy compressor 200, and the liquid outlet of the second air energy compressor 200 is connected to the liquid inlet of the evaporative heat exchanger 110. The first air energy compressor 100 is used to absorb heat in the air to heat the medium, and in order to ensure that the second air energy compressor 200 can work within a suitable temperature range, the temperature of the heated medium is controlled by the evaporative heat exchanger 110, and the second air energy compressor 200 is used to continue to increase the temperature of the medium.

[0026] It is understandable that the first air energy compressor 100 and the second air energy compressor 200 are provided to realize cascade compression, and the temperature can be raised to 100-120 degrees through the gradual increase and superposition of heat. The evaporative heat exchanger 110 of the first air energy compressor 100 can ensure that the medium temperature of the second air energy compressor 200 remains constant, avoiding the defect that the second air energy compressor 200 causes medium temperature fluctuations in a low temperature environment, thereby increasing energy consumption and ultimately having a low energy conversion value, thereby improving the energy conversion value of the air energy heat pump in a low temperature environment.

[0027] In one embodiment of the utility model, the first air energy compressor 100 further includes a first compressor 120, a first evaporator 130 and a first liquid storage tank 140, the evaporative heat exchanger 110 is connected to the liquid inlet of the first evaporator 130 via the first liquid storage tank 140, and the liquid outlet of the evaporator is connected to the liquid inlet of the evaporative heat exchanger 110 via the first compressor 120. Optionally, the first liquid storage tank 140 is connected to the liquid inlet of the first evaporator 130 via an expansion valve. Optionally, the first compressor 120 is a large-horsepower compressor with a power of 0.75KW to 1.5KW. The first compressor 120 can be a compressor of R410A refrigerant.

[0028] The first evaporator 130 draws in air through a fan to obtain heat from the air. The first compressor 120 can raise the temperature of the medium in the pipeline to 50-60 degrees. However, it is inconvenient for the second air energy compressor 200 to compress the medium at 50-60 degrees. Therefore, the temperature of the medium is adjusted to 35-45 degrees through the evaporative heat exchanger 110 to achieve secondary compression and increase the medium temperature.

[0029] In one embodiment of the utility model, the evaporative heat exchanger 110 includes a first condenser 111, a second evaporator 112, a first heat exchange pipe 113 and a second heat exchange pipe 114. The first heat exchange pipe 113 is connected to the first condenser 111 to achieve heat exchange inside the first air energy compressor 100. The second heat exchange pipe 114 is connected to the second evaporator 112 and communicates with the second air energy compressor 200. Optionally, the first condenser 111 and the second evaporator 112 are both provided with aluminum heat conduction fins. The first heat exchange pipe 113 and the second heat exchange pipe 114 both exchange heat through aluminum heat-conducting fins. The first heat exchange pipe 113 and the second heat exchange pipe 114 both include two groups of heat exchange pipes, which are used for heat release and heat absorption respectively. When the medium with high temperature passes through one group of pipes, the heat is released through the heat-conducting aluminum fins. At the same time, when the medium with low temperature passes through the other group of pipes, the heat is absorbed through the heat-conducting aluminum fins. Therefore, heat exchange is achieved between the two groups of pipes, and the temperature difference between the two groups of pipes is neutralized, thereby achieving the purpose of constant temperature.

[0030] In one embodiment of the utility model, the second air energy compressor 200 includes a second compressor 210, a second condenser 220 and a second liquid storage tank 230, the liquid outlet of the second compressor 210 is connected to the liquid inlet of the second condenser 220, the hot liquid outlet of the second condenser 220 is connected to the liquid tank via a circulating pump, and the cold liquid outlet of the second condenser 220 is connected to the evaporative heat exchanger 110 via the second liquid storage tank 230. Optionally, the liquid outlet of the second liquid storage tank 230 is provided with an expansion valve. Optionally, the second compressor 210 is a large two-horsepower compressor with a power of 1.5KW to 2.5KW. Specifically, the second compressor 210 can adopt a pentafluoro air energy compressor, whose medium adopts a medium with a higher boiling point, and a constant temperature is achieved through the evaporative heat exchanger 110 to ensure that the evaporation coefficient of the second compressor 210 is greater than 3, thereby reducing the pressure of the second compressor 210.

[0031] The technical solution of the utility model arranges a first air energy compressor 100 and a second air energy compressor 200 to realize cascade compression. The evaporative heat exchanger 110 of the first air energy compressor 100 can ensure that the medium temperature of the second air energy compressor 200 remains constant, thereby avoiding the defect of the second air energy compressor 200 causing medium temperature fluctuations in a low temperature environment, thereby increasing energy consumption and ultimately having a low energy conversion value, thereby improving the energy conversion value of the air energy heat pump in a low temperature environment.

[0032] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cascade high-temperature air energy heat pump for low-temperature environments, characterized in that: It comprises a first air energy compressor and a second air energy compressor, wherein the first air energy compressor comprises an evaporative heat exchanger, the liquid outlet of the evaporative heat exchanger is connected to the liquid inlet of the second air energy compressor, and the liquid outlet of the second air energy compressor is connected to the liquid inlet of the evaporative heat exchanger.

2. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 1, characterized in that: The first air energy compressor also includes a first compressor, a first evaporator and a first liquid storage tank. The evaporative heat exchanger is connected to the liquid inlet of the first evaporator through the first liquid storage tank, and the liquid outlet of the evaporator is connected to the liquid inlet of the evaporative heat exchanger through the first compressor.

3. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 2, characterized in that: The first liquid storage tank is communicated with the liquid inlet of the first evaporator via an expansion valve.

4. The cascade high-temperature air energy heat pump for low-temperature environment according to any one of claims 1 to 3, characterized in that: The evaporative heat exchanger includes a first condenser, a second evaporator, a first heat exchange pipe and a second heat exchange pipe. The first heat exchange pipe is connected to the first condenser to achieve heat exchange inside the first air energy compressor; the second heat exchange pipe is connected to the second evaporator and connected to the second air energy compressor.

5. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 4, characterized in that: The first condenser and the second evaporator are both provided with aluminum heat conducting fins.

6. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 2 or 3, characterized in that: The power of the first compressor is 0.75KW to 1.5KW.

7. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 1, characterized in that: The second air energy compressor includes a second compressor, a second condenser and a second liquid storage tank. The liquid outlet of the second compressor is connected to the liquid inlet of the second condenser. The hot liquid outlet of the second condenser is connected to the liquid tank via a circulating pump. The cold liquid outlet of the second condenser is connected to the evaporative heat exchanger via the second liquid storage tank.

8. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 7, characterized in that: The liquid outlet of the second liquid storage tank is provided with an expansion valve.

9. The cascade high-temperature air energy heat pump for low-temperature environment according to claim 7 or 8, characterized in that: The power of the second compressor is 1.5KW to 2.5KW.

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