CN219511059U

CN219511059U - Fin coil pipe for variable-frequency air-cooled heat pump

Info

Publication number: CN219511059U
Application number: CN202320563688.9U
Authority: CN
Inventors: 经武辉; 唐进军; 章立标; 严冬君
Original assignee: Zhejiang King Co ltd
Current assignee: Zhejiang King Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-08-11
Anticipated expiration: 2033-03-21

Abstract

The utility model belongs to the technical field of air source heat pumps, and particularly relates to a fin coil for a variable-frequency air-cooled heat pump, which comprises a heat exchange tube, wherein a plurality of layers of heat exchange tubes are arranged in a shell, fins are connected to the outer walls of the heat exchange tube in an expansion mode, two ends of the heat exchange tube are respectively connected with gas collecting tubes at two sides of the shell, a higher interface of two remaining interfaces of the tee is connected with a capillary liquid-separating tube, a lower interface of the tee is connected with the liquid collecting tube, each capillary liquid-separating tube is sequentially connected with a distributor and a distributor liquid-supplying tube, and a one-way valve for controlling fluid to flow from the liquid collecting tube to the distributor liquid-supplying tube is arranged in the liquid collecting tube at a near-junction position relative to the other end of the liquid collecting tube, which is connected with the side wall of the distributor liquid-supplying tube. The finned coil is particularly suitable for the variable-frequency air-cooled heat pump unit, and when the finned coil is used as a condenser, the refrigerant can be rapidly collected and discharged through the liquid collecting pipe, so that accumulation in the coil is prevented. When the evaporator is used, the advantage of capillary liquid separation can be utilized due to the arrangement of the one-way valve, so that the gas-liquid two-phase refrigerant can be uniformly distributed.

Description

Fin coil pipe for variable-frequency air-cooled heat pump

Technical Field

The utility model belongs to the technical field of air source heat pumps, and particularly relates to a fin coil for a variable-frequency air-cooled heat pump.

Background

The fin coil of the air-cooled heat pump unit is used as an evaporator when heating in winter, and the low-temperature low-pressure gas-liquid mixed refrigerant throttled by the expansion valve enters a heat exchange loop of the fin coil after passing through the distributor and the liquid dividing pipe, absorbs heat from outdoor air and evaporates into superheated low-pressure gas. In order to realize uniform heat exchange of each heat exchange loop of the fin coil, the mass flow of the gas-liquid two-phase refrigerant entering the heat exchange loop is required to be ensured to be similar. The common practice is to arrange small holes at the inlet of the distributor to increase the pressure of the refrigerant, to fully mix the gas-liquid two-phase refrigerant after further throttling and to enter the liquid-separating capillary, and to uniformly distribute the low-pressure gas-liquid two-phase refrigerant to each heat exchange loop by utilizing the characteristic of small diameter and large pressure drop of the liquid-separating capillary. For the variable-frequency air-cooled heat pump unit, in order to improve the heat exchange efficiency of the fin coil pipes under the partial load of the unit, the loop number of the fin coil pipes is generally reduced in design so as to improve the mass flow rate of the refrigerant and the heat flow density in the pipe of each heat exchange loop of the fin coil pipes, and correspondingly, the number of the distribution capillary pipes is correspondingly reduced due to the reduction of the loop number of the fin coil pipes.

When the heat pump unit is used for refrigerating in summer, high-temperature and high-pressure refrigerant gas is condensed in the fin coil pipe and then is collected by the liquid separating capillary tube and the distributor and then is throttled by the expansion valve. Because the flow areas of the distribution capillary tubes and the distributor are small, more liquid refrigerant is accumulated in the fin coil heat exchange tubes, so that the utilization rate of the fin coil heat exchange area is reduced, the condensing temperature of the unit is increased, and the refrigerating capacity and the refrigerating energy efficiency are reduced. In particular, for variable-frequency air-cooled heat pump units, the number of liquid distribution pipes is relatively smaller, the circulation capacity of liquid refrigerant is weaker, and the negative influence on the refrigerating capacity and the refrigerating energy efficiency is larger during full-load operation.

Disclosure of Invention

Aiming at the technical problems existing in the prior art, the utility model provides a fin coil for a variable-frequency air-cooled heat pump.

The utility model provides a frequency conversion is fin coil pipe for forced air cooling heat pump includes from top to bottom evenly arranged's multilayer heat exchange tube 2 in the casing 1, heat exchange tube 2 outer wall expanded joint has fin 3, the left and right sides of casing 1 is equipped with gas collecting tube 5 and tee bend 4 respectively, and gas collecting tube 5 is connected with heat exchange tube 2 one end, and the heat exchange tube 2 other end is connected with one of the interfaces of tee bend 4, two interfaces that tee bend 4 remain, wherein higher interface is connected with capillary divides liquid tube 7, and lower interface is connected with collector tube 6, each capillary divides liquid tube 7 back to be connected with distributor 8, distributor feed tube 9 in proper order, for the other end that collector tube 6 and tee bend 4 are connected, its and distributor feed tube 9 lateral wall intercommunication are equipped with the check valve 10 of control fluid by collector tube 6 flow direction distributor feed tube 9 in the collector tube 6 of nearly junction.

Particularly, the gas collecting tube 5 is flute-shaped, and is provided with gas collecting tube 5 branches corresponding to each layer of heat exchange tube 2 from top to bottom, and the gas collecting tube 5 branches penetrate through the side wall of the shell 1 and are connected with one end of the heat exchange tube 2.

In particular, the liquid collecting pipe 6 is L-shaped, the vertical section of the L-shaped liquid collecting pipe 6 is provided with liquid collecting pipe 6 branches corresponding to each layer of heat exchange pipe 2 from top to bottom, and the liquid collecting pipe 6 branches penetrate through the side wall of the shell 1 and are connected with the other end of the heat exchange pipe 2.

In particular, the one-way valve 10 is provided in the transverse section of the L-shaped header 6.

In particular, the number of layers of the heat exchange tube 2 is 5-8.

In particular, the finned coil and the compressor, four-way valve, expansion valve and heat exchanger form a refrigerant circulation loop.

On the basis of the common sense in the art, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the utility model.

The technical scheme has the following advantages or beneficial effects: the finned coil is particularly suitable for the variable-frequency air-cooled heat pump unit, and when the finned coil is used as a condenser, the refrigerant can be rapidly collected and discharged through the liquid collecting pipe, so that the refrigerant is prevented from being accumulated in the coil. When the fin coil is used as an evaporator, the advantage of capillary liquid separation can be taken into consideration due to the arrangement of the one-way valve, and the gas-liquid two-phase refrigerant can be uniformly distributed.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be obvious to a person skilled in the art that other figures can be obtained from the figures provided without the inventive effort.

Fig. 1 is a schematic structural view of a fin coil for a variable frequency air-cooled heat pump according to the present disclosure.

Description of the embodiments

The technical solutions in the embodiments of the present utility model are clearly and completely described below with reference to the accompanying drawings. It is obvious that the described embodiments are only some of the embodiments of the present utility model and are intended to explain the inventive concept. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

The terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like as used in the description are based on the orientation or positional relationship shown in the drawings and are merely for simplicity of description and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation.

The terms "coupled," "connected," and the like as used in the description herein are to be construed broadly and may be, for example, fixedly coupled, detachably coupled, or integrally formed, unless otherwise specifically defined and limited; may be a mechanical connection, an electrical connection; can be directly connected and indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the terms in the embodiments can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, the utility model discloses a fin coil for a variable frequency air-cooled heat pump, which comprises a plurality of layers of heat exchange tubes 2 which are uniformly arranged from top to bottom and are arranged in a shell 1, wherein fins 3 are connected to the outer wall of the heat exchange tubes 2 in an expansion mode. The left and right sides of casing 1 are equipped with flute shape gas collecting tube 5 and tee bend 4 respectively, gas collecting tube 5 is connected with heat exchange tube 2 one end, heat exchange tube 2 other end is connected with one of the interface of tee bend 4. The three-way pipe 4 is provided with two remaining interfaces, wherein the higher interface is connected with the capillary liquid separating pipe 7, and the lower interface is connected with the liquid collecting pipe 6. The capillary liquid-dividing pipes 7 are sequentially connected with the distributor 8 and the distributor liquid-supplying pipe 9, the other end, which is connected with the tee joint 4 relative to the liquid-collecting pipe 6, is communicated with the side wall of the distributor liquid-supplying pipe 9, a one-way valve 10 for controlling the flow direction of fluid is arranged in the liquid-collecting pipe 6 at the near joint, and when the capillary liquid-dividing pipe is in forward direction, the one-way valve 10 guides high-pressure refrigerant liquid flowing from the liquid-collecting pipe 6 in a refrigeration mode to the distributor liquid-supplying pipe 9 and then leaves the fin coil; in the reverse direction, the check valve 10 blocks the low-pressure gas-liquid two-phase refrigerant flowing downwards from the distributor liquid supply pipe 9 in the heating mode from entering the heat exchange pipe 2 through the liquid collecting pipe 6 and the tee joint 4.

Preferably, the number of the heat exchange tubes 2 arranged in the shell 1 is 5-8. The gas collecting tube 5 is flute-shaped, and is provided with gas collecting tube 5 branches corresponding to each layer of heat exchange tube 2 from top to bottom, and the gas collecting tube 5 branches penetrate through the side wall of the shell 1 and are connected with one end of the heat exchange tube 2. The liquid collecting pipe 6 is L-shaped, a vertical section of the L-shaped liquid collecting pipe 6 is provided with liquid collecting pipe 6 branches corresponding to each layer of heat exchange pipes 2 from top to bottom, the liquid collecting pipe 6 branches penetrate through the side wall of the shell 1 and are connected with the other end of the heat exchange pipe 2, and the one-way valve 10 is arranged in a transverse section of the L-shaped liquid collecting pipe 6.

The heat exchange tubes 2 are arranged in multiple layers from top to bottom, and the heat exchange tubes 2 of the relevant layers are mutually communicated to form a plurality of independent heat exchange loops. The air side port (i.e. the air inlet of the refrigeration mode or the air outlet of the heating mode) of each heat exchange loop is communicated with each branch pipe on the gas collecting pipe 5, each liquid side port (i.e. the liquid outlet of the refrigeration mode or the liquid inlet of the heating mode) of each heat exchange loop is communicated with the total port of each tee 4, the higher branch port of the other two branch ports of each tee 4 is communicated with each capillary liquid separating pipe 7, and the lower branch port is communicated with each branch pipe of the liquid collecting pipe 6.

The heat pump unit comprises a compressor, a four-way valve, a fin coil, an expansion valve and a heat exchanger. When the heat pump unit is in different operation modes, the corresponding refrigerant in the fin coil also has the following flow.

When the heat pump unit operates in a refrigeration mode, high-temperature and high-pressure refrigerant gas exhausted by the compressor enters the heat exchange tubes 2 of each heat exchange loop through each branch pipe on the gas collecting tube 5, heat is discharged to air outside the heat exchange tubes 2 through the fin coil pipes and then condensed into high-pressure liquid, then enters the liquid collecting tube 6 with a thicker pipe diameter through the branch ports with a lower tee joint 4, and then is discharged from the fin coil pipes through the one-way valve 10 and the distributor liquid supply tube 9, so that the liquid discharge effect of condensed liquid refrigerant in the heat exchange tubes 2 in the refrigeration mode can be effectively improved, the liquid accumulation amount in the heat exchange tubes is reduced, the utilization rate of the heat exchange area of the heat exchange tubes 2 is improved, the condensation temperature can be effectively reduced, and the refrigeration energy efficiency is improved. Particularly for the variable frequency air-cooled heat pump, flash evaporation of high-pressure liquid at the inlet of the expansion valve caused by overlarge pressure drop when the condensed high-pressure liquid flows through the Mao Xifen liquid pipe 7 and the distributor 8 can be effectively avoided, so that the circulation capacity of the expansion valve and the refrigerant flow are insufficient, the evaporation temperature of a unit is excessively low, the condensation temperature is excessively high, and the refrigerating capacity and the refrigerating energy efficiency of the unit are seriously attenuated.

When the heat pump unit operates in the defrosting mode, the fan of the fin coil is closed, and the flow direction of the refrigerant is consistent with that of the refrigerating operation.

When the heat pump unit operates in a heating mode, the gas-liquid two-phase refrigerant throttled by the expansion valve can only be uniformly distributed into the heat exchange loop of the fin coil to absorb heat through the liquid pipe 7 of the distributor 8 and the Mao Xifen in sequence due to the obstruction of the one-way valve 10, and the gas-phase refrigerant evaporated into gas-phase refrigerant is collected through the gas collecting pipe 5 and then led to the four-way reversing valve. When the heating mode is operated, the fin coil is used as an evaporator, and when the gas-liquid two-phase refrigerant throttled by the expansion valve flows through the distributor liquid supply pipe 9, the gas-liquid two-phase refrigerant cannot directly enter the fin coil heat exchange loop due to the blocking of the check valve 10, and can only flow into the fin coil heat exchange loop after being uniformly distributed by the distributor 8 and the capillary liquid distribution pipe 7 in sequence, so that the uniformity of refrigerant distribution is improved, and the heat exchange efficiency of the evaporation coil is effectively ensured.

While embodiments of the present utility model have been illustrated and described above, it will be appreciated that the above described embodiments are illustrative and should not be construed as limiting the utility model. The present utility model is subject to various changes and modifications without departing from the spirit and scope thereof, and such changes and modifications fall within the scope of the utility model as hereinafter claimed.

Claims

1. The utility model provides a frequency conversion air-cooled heat pump is with fin coil pipe, includes in casing (1) from top to bottom evenly arranged's multilayer heat exchange tube (2), heat exchange tube (2) outer wall expansion joint has fin (3), its characterized in that: the utility model discloses a liquid distributor, including casing (1), tee bend (4) are equipped with gas collecting tube (5) respectively to the left and right sides of casing (1), and gas collecting tube (5) are connected with heat exchange tube (2) one end, and heat exchange tube (2) other end is connected with one of the interface of tee bend (4), two interfaces that tee bend (4) remain, wherein higher interface is connected with capillary branch liquid pipe (7), and lower interface is connected with liquid collecting tube (6), each capillary branch liquid pipe (7) are connected with distributor (8), distributor feed pipe (9) in proper order afterwards, for the other end that liquid collecting tube (6) are connected with tee bend (4), its side wall intercommunication with distributor feed pipe (9), be equipped with in liquid collecting tube (6) of nearly junction control fluid by liquid collecting tube (6) flow direction distributor feed pipe (9) check valve (10).

2. A variable frequency air cooled heat pump fin coil according to claim 1, wherein: the gas collecting tube (5) is flute-shaped, the gas collecting tube (5) corresponding to each layer of heat exchange tube (2) is arranged from top to bottom, and the gas collecting tube (5) passes through the side wall of the shell (1) in a branching way and is connected with one end of the heat exchange tube (2).

3. A variable frequency air cooled heat pump fin coil according to claim 2, wherein: the liquid collecting pipe (6) is L-shaped, a vertical section of the L-shaped liquid collecting pipe (6) is provided with liquid collecting pipe (6) branches corresponding to each layer of heat exchange pipe (2) from top to bottom, and the liquid collecting pipe (6) branches penetrate through the side wall of the shell (1) and are connected with the other end of the heat exchange pipe (2).

4. A variable frequency air cooled heat pump fin coil according to claim 3, wherein: the one-way valve (10) is arranged in the transverse section of the L-shaped liquid collecting pipe (6).

5. A variable frequency air cooled heat pump fin coil according to claim 1, wherein: the number of layers of the heat exchange tube (2) is 5-8.

6. A variable frequency air cooled heat pump fin coil according to claim 1, wherein: the fin coil, the compressor, the four-way valve, the expansion valve and the heat exchanger form a refrigerant circulation loop.