Defrosting device and air source heat pump device

Abstract

The utility model belongs to the technical field of heating ventilation air conditioners, and particularly relates to a defrosting device and an air source heat pump device. The defrosting device comprises a hot air pipe, the hot air pipe is arranged around the fin type heat exchanger, and air holes facing one side of the fin type heat exchanger are formed in the hot air pipe. The vortex tube comprises a vortex chamber, an air inlet, a cold air section and a hot air section, the air inlet, the cold air section and the hot air section are communicated with the vortex chamber, the air inlet is used for introducing compressed air, the hot air section is connected with the hot air pipe, and the air outlet direction of the cold air section faces the outer side of the fin heat exchanger. According to the defrosting device, compressed air is used for defrosting, so that the air source heat pump device can stably heat and supply heat for a long time in a low-temperature environment, sufficient compressed air resources of a plant are reasonably utilized to be matched with the defrosting device, non-stop defrosting of a heat pump unit can be achieved, and the heat exchange performance of the heat pump unit is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heating ventilation air conditioning, especially relates to a defrosting device and air source heat pump device. BACKGROUND

[0002] With the scientific development and the concept of green and sustainable development being deeply rooted in people's hearts, and the orderly promotion of the double-carbon target of carbon peak and carbon neutralization, clean and green energy technology has been vigorously developed. As an important energy-saving and emission-reducing technology, air source heat pump technology has made an important contribution in emission reduction and consumption reduction. When working in winter, the fin heat exchanger absorbs heat from the air, and the compressor does work to lift the heat in the condenser, heating the water to 45 DEG C or above to provide indoor heating. Because the COP (energy efficiency ratio) of the heat pump is always greater than 1, the heating efficiency of the conventional air source heat pump can reach more than 3, so the air source heat pump heating technology is widely promoted.

[0003] However, due to the low outdoor air temperature in winter, the evaporation temperature of the heat pump is also lower, and the heating efficiency is also lower. Especially when the evaporator fins of the heat pump are covered with frost and ice, the heat transfer resistance increases, the heat transfer effect deteriorates, and the heat pump heating performance further decreases. Therefore, air source heat pump products will be equipped with some defrosting measures to improve the frost and ice conditions. The common measure is to start the defrosting mode to defrost, during which the equipment suspends heating. The so-called defrosting mode is to switch the four-way valve of the heat pump system to make the heat pump dissipate heat at the fin heat exchanger to melt the ice and frost, and at the same time absorb heat from the water loop. This results in a decrease in heating effect in winter. Chinese patent No. CN221944531U discloses a finned heat exchanger with automatic defrosting function. The technical scheme switches the circulating loop of the finned evaporator between the circulating main loop and the defrosting loop through the electromagnetic valve to automatically defrost when switched to the defrosting loop. This defrosting method still uses the circulating loop of the finned heat exchanger itself, which will affect the heating effect and is difficult to defrost continuously. If defrosting can be done without changing the heating mode, the winter heating effect of the air source heat pump can be improved more effectively. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a defrosting device and air source heat pump device, the utility model arranges hot gas pipe around fin heat exchanger, utilizes the sufficient compressed air resources in warehouse to cooperate with the hot gas pipe of vortex tube unceasingly conveying hot gas flow, defrosts fin heat exchanger through hot gas pipe, this defrosting mode can achieve the purpose of ensuring the heating effect while effectively defrosting.

[0005] The utility model adopts the following technical scheme to solve the problem:

[0006] In a first aspect, the utility model provides a defrosting device, which comprises:

[0007] A hot gas pipe is arranged around the fin heat exchanger, and the hot gas pipe is provided with air holes facing the side of the fin heat exchanger.

[0008] The vortex pipe comprises a vortex chamber, an air inlet, a cold gas section and a hot gas section, the air inlet is used for introducing compressed air, and the hot gas section is connected to the hot gas pipe.

[0009] The utility model discloses a reasonable utilization of the sufficient compressed air resource of factory building, and the compressed air forms hot air flow and cold air flow after entering the vortex chamber through the air inlet of the vortex pipe, and the hot air flow and the cold air flow are discharged through the hot gas section and the cold gas section respectively, so that the hot gas pipe can continuously provide hot air flow, thereby realizing the defrosting of the heat pump unit without stopping, improving the heat exchange performance of the heat pump unit, and improving the heating efficiency and operation stability of the heat pump unit.

[0010] Optionally, the air inlet of the vortex pipe is provided with a control valve.

[0011] The utility model discloses a control valve can control the start and stop of defrosting operation as required to avoid compressed air waste.

[0012] Optionally, the control valve comprises an electromagnetic valve.

[0013] The utility model discloses a control valve is set as electromagnetic valve and can be controlled by the PLC control program of heat pump unit, and automatic control is convenient and response speed is fast.

[0014] Optionally, the vortex chamber is provided with a boss structure protruding towards the hot gas section, and a vortex cavity is formed in the vortex chamber.

[0015] The vortex cavity of the utility model can promote the rotation of compressed air and improve the separation efficiency of cold and hot air flow, and the heating effect can also be improved to strengthen the defrosting capacity.

[0016] Optionally, the hot gas section outlet of the vortex pipe is provided with a tapered plug.

[0017] The utility model discloses a tapered plug position can be adjusted to adjust the proportion of hot air and cold air, to adjust the defrosting effect adaptively.

[0018] Optionally, it also comprises a water collecting tank arranged around the fin heat exchanger.

[0019] The water collecting tank of the utility model can hold the water and ice frost melted and fallen on the fin heat exchanger, avoid the melted water and ice frost from contacting the hot gas pipe to cause heat waste, and prevent water stains from remaining to cause secondary icing.

[0020] Optionally, the pipe openings of the hot gas pipe are connected to the hot gas section of the vortex pipe.

[0021] The hot gas pipe can be provided with a plurality of pipe openings, and the plurality of pipe openings can be connected to the hot gas section of the vortex pipe to avoid the situation of insufficient heat of the hot gas pipe.

[0022] Optionally, the air hole on the hot gas pipe comprises a strip-shaped hole and is arranged to be inclined towards the fin heat exchanger.

[0023] The hot gas pipe can blow the strip-shaped hole towards the fin to melt the ice and frost in the fin to improve the heat exchange effect.

[0024] In the second aspect, the utility model provides a kind of air source heat pump device, it includes the defrosting device, still include:

[0025] Fin heat exchanger,

[0026] Unit outer frame, cover is arranged outside the fin heat exchanger, and the top of the unit outer frame is equipped with fan.

[0027] The defrosting device is arranged around the fin heat exchanger to continuously heat the fin heat exchanger, and in addition, the fan at the top of the unit outer frame can drive the air around the unit to pass through the fin heat exchanger and be discharged upwards when normally operating.

[0028] Optionally, the hot gas pipe and the vortex pipe are both installed on the unit outer frame.

[0029] The hot gas pipe and the vortex pipe can be directly installed on the unit outer frame, which is convenient for disassembly, installation and inspection, and has low maintenance cost.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] 1, the hot gas pipe is arranged around the fin heat exchanger, compressed air enters vortex chamber from air inlet to form hot gas flow and cold gas flow, cold gas flow is discharged from cold gas section, hot gas flow enters hot gas pipe from hot gas section, and is blown to the fin heat exchanger from air hole, so as to utilize the sufficient compressed air resources of workshop to cooperate with vortex pipe to continuously provide hot gas flow for hot gas pipe, can continuously defrost the fin heat exchanger without affecting the circulating loop of fin heat exchanger itself, so that air source heat pump device can be long-term stable heating in low temperature environment, effectively improve the heat exchange performance of heat pump unit, improve the heating efficiency and operating stability of heat pump unit, reduce equipment power consumption, and have positive significance to energy saving and emission reduction strategy target.

[0032] 2, The defrosting device of the utility model has simple structure, stable operation and no need of extra power consumption, effectively ensuring the stability and energy saving of the air source heat pump unit. The defrosting device can be directly fixed on the unit outer frame, facilitating dismounting, installation and inspection, and reducing maintenance cost. The control valve can effectively control the closing and starting of compressed air, which not only can make full use of the plant resources but also can avoid waste, realizing system energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structural schematic view of the defrosting device in embodiment 1.

[0034] Figure 2 It is a sectional view of the vortex tube. Figure 1

[0035] Mark No. in the drawing: 1, unit outer frame; 2, fin heat exchanger; 3, fan; 4, water collecting tank; 5, vortex tube; 6, control valve; 7, hot gas pipe; 501, cold gas section; 502, air inlet; 503, vortex chamber; 504, hot gas section; 505, conical plug; 506, vortex cavity. DETAILED DESCRIPTION

[0036] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawing, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0037] ​The utility model will be described further below in conjunction with the drawings. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model. Example 1

[0038] In combination Figures 1-2 , the present embodiment provides a defrosting device, which comprises a fin heat exchanger 2, a hot gas pipe 7 and a vortex tube 5, the hot gas pipe 7 is arranged around the fin heat exchanger 2, the shape and extension path of the hot gas pipe 7 are consistent with the fin heat exchanger 2, so as to facilitate the flow of air flow and the full use of heat energy. In addition, the hot gas pipe 7 is provided with air holes on the side facing the fin heat exchanger 2; the air holes are strip-shaped holes and are arranged uniformly, each air hole is arranged towards the fin heat exchanger 2, and hot gas can blow towards the fin to melt frost, thereby improving the heat exchange effect. The vortex tube 5 comprises a vortex chamber 503, an air inlet 502, a cold gas section 501 and a hot gas section 504 in communication with the vortex chamber 503, when frost is formed on the fin heat exchanger 2, compressed air enters the vortex chamber 503 from the air inlet 502 to form hot gas flow and cold gas flow, the hot gas flow and the cold gas flow are discharged from the hot gas section 504 and the cold gas section 501 respectively, the hot gas section 504 is connected to the pipe opening of the hot gas pipe 7, and the hot gas flow can blow towards the fin heat exchanger 2 from the air holes after entering the hot gas pipe 7, so that the sufficient compressed air resources of the factory building are used to cooperate with the vortex tube to provide hot gas flow for the hot gas pipe without interruption, frost on the fin heat exchanger 2 can be melted directionally without affecting the circulating loop of the fin heat exchanger itself, and the defrosting operation can be carried out simultaneously with the heating process to maintain the heat pump efficiency. In addition, the gas outlet direction of the cold gas section 501 is towards the outside of the fin heat exchanger 2 to avoid the influence of the cold gas flow on the defrosting operation. In a specific embodiment, the defrosting device comprises two vortex tubes 5, the two vortex tubes 5 are located at the two ends of the hot gas pipe 7 respectively, and the two pipe openings of the hot gas pipe 7 are connected to the hot gas sections 504 of the two vortex tubes 5 respectively, so as to eliminate the problem of insufficient gas and heat at the end of the hot gas pipe 7 existing in a single vortex tube 5. Of course, the hot gas pipe 7 can be provided with more than two pipe openings and corresponding multiple vortex tubes 5, so as to ensure sufficient heat of the hot gas pipe 7.

[0039] In actual arrangement, the vortex tube 5 can be arranged along the unit outer frame 1 of the heat pump unit, and almost no influence will be generated on the overall appearance of the entire heat pump unit. The hot gas pipe 7 can be fixed on the unit outer frame 1 to prevent displacement of the device caused by vibration of the heat pump unit, in combination Figure 1In a specific embodiment, the hot gas pipe 7 is arranged in a C shape around the fin heat exchanger 2 to provide sufficient heat and ensure defrosting effect. In addition, a water collecting tank 4 is arranged below the fin heat exchanger 2 to collect the water and ice melt from the fin heat exchanger 2, avoid the waste of heat caused by the contact between the water melt and the hot gas pipe 7, and prevent the secondary ice formation caused by the water stain. The defrosting device in this embodiment can realize non-stop defrosting to ensure the stable heating of the heat pump unit and improve the efficiency and stability.

[0040] In a specific embodiment, the control valve 6 is arranged at the air inlet 502 of the vortex tube 5, which is an electromagnetic valve and is controlled by the PLC control program of the heat pump unit. When the heat pump unit detects the frost on the heat exchanger, the control valve 6 is opened to allow the compressed air to enter the air inlet 502 of the vortex tube 5 for defrosting. The control valve 6 can control the start and stop of the defrosting operation as needed to avoid waste of compressed air.

[0041] In a specific embodiment, the air inlet pipe of the air inlet 502 of the vortex tube 5 is tangent to the inner wall of the vortex chamber 503, and the vortex chamber 503 has a boss structure protruding towards the hot gas section 504 to form a vortex cavity 506 in the vortex chamber 503, thereby promoting the rotation of the compressed air and improving the cold and hot gas separation efficiency, thereby providing sufficient heat for the hot gas pipe 7 to enhance the defrosting capacity. In addition, the hot gas section 504 of the vortex tube 5 is provided with a tapered plug 505, and the proportion of hot gas and cold gas can be adjusted by adjusting the position of the tapered plug 505.

[0042] The defrosting device of this embodiment uses compressed air for defrosting, which enables the air source heat pump device to provide stable heating in low temperature environment for a long time. In addition, there is sufficient compressed air resource in the factory, and this embodiment can realize non-stop defrosting of the heat pump unit by reasonably utilizing the sufficient compressed air resource in the factory and combining the vortex tube 5 device, thereby effectively improving the heat exchange performance of the heat pump unit, improving the heating efficiency and operation stability of the heat pump unit, reducing the power consumption of the equipment, and having positive significance for the energy saving and emission reduction strategy. At the same time, the defrosting device of this embodiment does not need to arrange many additional components, has a simple structure, stable operation, and does not need to consume additional electric energy, thereby effectively ensuring the stability and energy saving of the air source heat pump unit. In addition, the defrosting device can be directly fixed on the unit frame 1, which is convenient for disassembly, installation and inspection, and has low maintenance cost. The control valve 6 on the air inlet pipe of the vortex tube 5 can effectively control the closing and starting of the compressed air, which not only makes full use of the factory resources but also avoids waste, thereby realizing system energy saving. Embodiment 2

[0043] The embodiment provides an air source heat pump device, which comprises the defrosting device described in the embodiment 1, further comprises a fin heat exchanger 2 and a unit outer frame 1, the unit outer frame 1 is covered outside the fin heat exchanger 2, the hot gas pipe 7 and the vortex pipe 5 are all installed on the unit outer frame 1. The top of the unit outer frame 1 is provided with a fan 3, the fan 3 is located at the top of the unit outer frame 1, and can drive air around the unit to pass through the fin heat exchanger 2 and be discharged upwards in normal operation.

[0044] The above merely describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A defrosting device, characterized in that, The application relates to a defrosting device for a heat exchanger. The defrosting device comprises a hot air pipe (7) arranged around a fin heat exchanger (2), wherein the hot air pipe (7) is provided with air holes facing the fin heat exchanger (2); and a vortex pipe (5) comprising a vortex chamber (503), an air inlet (502) in communication with the vortex chamber (503), a cold air section (501) and a hot air section (504), wherein the air inlet (502) is used for introducing compressed air, the hot air section (504) is connected with the hot air pipe (7), and the air outlet direction of the cold air section (501) faces the outside of the fin heat exchanger (2). The air inlet (502) of the vortex pipe (5) is provided with a control valve (6).

2. The defrosting device according to claim 1, characterized in that The control valve (6) comprises an electromagnetic valve.

3. The defrosting device according to claim 2, characterized in that The vortex chamber (503) is provided with a boss structure protruding towards the hot air section (504) and forms a vortex cavity (506) in the vortex chamber (503).

4. The defrosting device according to claim 1, characterized in that The hot air section (504) of the vortex pipe (5) is provided with a conical plug (505).

5. The defrosting device according to claim 1, characterized in that The application further relates to a defrosting device.

6. The defrosting device according to claim 1, characterized in that The defrosting device further comprises a water collecting tank (4) arranged below the fin heat exchanger (2). The air holes of the hot air pipe (7) comprise strip-shaped holes and are arranged to be inclined towards the fin heat exchanger (2).

7. The defrosting device according to claim 1, characterized in that The defrosting device further comprises a fin heat exchanger (2), a unit outer frame (1) covering the outside of the fin heat exchanger (2), and a fan (3) arranged on the top of the unit outer frame (1).

8. The defrosting device according to claim 1, characterized in that The hot air pipe (7) and the vortex pipe (5) are both mounted on the unit outer frame (1).

9. An air source heat pump apparatus, characterised in that, ​ ​ ​ 10. The air source heat pump apparatus of claim 9, wherein, ​

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