WO2016029608A1

WO2016029608A1 - Fluid equalizing device and air conditioner having same

Info

Publication number: WO2016029608A1
Application number: PCT/CN2014/095188
Authority: WO
Inventors: 杨智峰; 周伟峰; 林锐源
Original assignee: 珠海格力电器股份有限公司
Priority date: 2014-08-28
Filing date: 2014-12-26
Publication date: 2016-03-03
Also published as: CN104154685A

Abstract

A fluid equalizing device and air conditioner having the same; the fluid equalizing device comprises a pretreatment part having a tube shell (2) and a fluid equalizing part (6); the tube shell (2) is provided with a fluid inlet (21) and a fluid outlet (22) thereon, and has a receiving cavity therein; the receiving cavity is provided with a bubble breaking structure therein for breaking bubbles; the bubble breaking structure is located between the fluid inlet (21) and the fluid outlet (22); and the fluid equalizing part (6) communicates with the pretreatment part, and is located at the downstream of the pretreatment part. The fluid equalizing device realizes a better fluid equalizing effect.

Description

Current sharing device and air conditioner having the same

Technical field

The present invention relates to the field of air conditioning equipment accessories, and in particular to a current sharing device and an air conditioner having the same.

Background technique

When the existing shunting mechanism air conditioner is fully loaded, the flow rate of the refrigerant in the shunting mechanism is fast, the shunting uniformity is poor, and the current sharing effect cannot meet the use requirements. The existing current equalizer splits the refrigerant. In order to ensure uniform flow distribution, the installation angle of the flow divider is strictly required. If the installation angle is biased, the performance consistency of the product will be poor. In summary, the existing current equalizers have strict process requirements and poor current sharing effects.

Summary of the invention

The present invention aims to provide a current sharing device and an air conditioner having the same, which solves the problem of poor current sharing effect of the current equalizer in the prior art.

In order to achieve the above object, according to an aspect of the present invention, a flow equalizing device is provided, the flow sharing device comprising: a pretreatment portion having a tube casing, the tube casing being provided with a fluid inlet and a fluid outlet, and the tube The housing has a receiving cavity in which a bubble breaking structure for dispersing air bubbles is disposed, the bubble breaking structure is located between the fluid inlet and the fluid outlet; the current sharing portion, the current sharing portion is in communication with the pretreatment portion, and is located downstream of the pretreatment portion .

Further, the pretreatment portion further includes a fluid inlet pipe and a fluid outlet pipe, the fluid inlet pipe is fixedly disposed on the pipe casing, and communicates with the accommodating cavity through the fluid inlet, the fluid outlet pipe is fixedly disposed on the pipe casing, and passes through the fluid outlet The accommodating chamber is connected, and the convection portion is connected to the fluid outlet pipe.

Further, the diameter of the tube shell is larger than the diameter of the fluid inlet tube.

Further, the bubble breaking structure is a filter net, and the filter net is fixedly disposed in the accommodating cavity.

Further, a filter bracket is further fixedly disposed in the accommodating cavity, the filter net comprises a mesh surface and a skeleton, and the skeleton is fixedly connected with the filter mesh bracket, and the mesh mask is disposed outside the skeleton.

Further, the skeleton is spiral, and the cross-sectional area of the skeleton gradually increases along the flow direction of the fluid, and there is a gap between the adjacent two spirals of the skeleton.

Further, the bubble breaking structure comprises a substrate and a vent hole penetrating the substrate, and the substrate is fixedly disposed in the tube case.

Further, a finite-position protrusion is further disposed on the tube casing, and the limiting protrusion protrudes toward the axis of the tube casing, and the limiting protrusions are respectively located at two ends of the filter frame in the fluid flow direction.

According to another aspect of the present invention, an air conditioner including a first heat exchanger, a second heat exchanger, and a current equalizing device connected between the first heat exchanger and the second heat exchanger is provided The current sharing device is the above-described current sharing device.

Further, the fluid inlet of the current equalization device is in communication with the outlet of the first heat exchanger, and the liquid separation capillary of the current sharing portion of the current sharing device is in communication with the inlet of the second heat exchanger, and the fluid inlet of the pretreatment portion of the flow sharing device And the fluid outlet is straight down.

By applying the technical solution of the present invention, the large bubble trapped in the liquid refrigerant can be divided into smaller bubbles by the bubble breaking structure disposed in the envelope, and the small bubbles are more likely to flow with the liquid refrigerant, thus avoiding large The presence of bubbles prevents the stratification of the refrigerant and ensures that the refrigerant can have a good current sharing effect after entering the current sharing section.

DRAWINGS

The accompanying drawings, which are incorporated in the claims In the drawing:

1 is a schematic structural view of a current sharing device of an embodiment of the present invention;

Figure 2 is a cross-sectional view showing the envelope of the flow equalizing device of the embodiment of the present invention;

Figure 3 is a plan view showing the envelope of the current sharing device of the embodiment of the present invention;

Fig. 4 is a front elevational view showing the envelope of the current equalizing device of the embodiment of the present invention.

DESCRIPTION OF REFERENCE NUMERALS: 1, fluid inlet pipe; 2, casing; 21, fluid inlet; 22, fluid outlet; 24, limit projection; 31, sieve support; 32, mesh; 33, skeleton; Fluid outlet tube; 6, current sharing portion; 7, liquid separation capillary.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

As shown in FIGS. 1 to 4, according to an embodiment of the present invention, a current equalizing device includes a pre-processing portion and a current sharing portion 6. The pretreatment portion has a casing 2, and the casing 2 is provided with a fluid inlet 21 and a fluid outlet 22, and the casing 2 has a housing therein The cavity is provided with a bubble breaking structure in which the bubble is broken, and the bubble breaking structure is located between the fluid inlet 21 and the fluid outlet 22. The flow equalization unit 6 is in communication with the pretreatment unit and is located downstream of the pretreatment unit. The pre-processing unit processes the refrigerant entering the equalizing unit 6, and ensures the uniformity of the refrigerant entering the equalizing unit 6, thereby ensuring the current sharing effect of the current sharing unit 6. Among them, the large gaseous refrigerant bubbles in the liquid refrigerant are broken by the bubble breaking structure, so that the volume of the refrigerant bubbles is reduced, and the smaller refrigerant bubbles are more easily trapped by the liquid refrigerant, which is more favorable for distributing in the flow process. In the liquid refrigerant, the uniformity of the refrigerant entering the equalizing portion 6 can be ensured, thereby ensuring the current sharing effect of the flow equalizing portion 6.

In this embodiment, the pretreatment portion further includes a fluid inlet pipe 1 and a fluid outlet pipe 5, and the fluid inlet pipe 1 is fixedly disposed on the casing 2, and communicates with the accommodating cavity through the fluid inlet 21, and the fluid outlet pipe 5 is fixedly disposed at The tube casing 2 is connected to the accommodating chamber through the fluid outlet 22, and the convection portion 6 is connected to the fluid outlet pipe 5. The flow equalizing device communicates with the upstream component through the fluid inlet pipe 1 to ensure that the refrigerant flow path is unobstructed. The fluid outlet pipe 5 is for communicating the accommodating chambers of the flow equalizing portion 6 and the envelope 2 to ensure that the refrigerant can smoothly enter the convection portion 6. The bulb 2, the fluid inlet tube 1 and the fluid outlet tube 5 constitute a dispenser.

Preferably, in order to make the distribution of the refrigerant bubbles more uniform in the liquid refrigerant, the diameter of the envelope 2 is larger than the diameter of the fluid inlet tube 1. Thus, when the refrigerant enters the accommodating chamber of the envelope 2 from the fluid inlet pipe 1, the flow rate of the refrigerant decreases due to the larger diameter of the pipe, thereby reducing the delamination effect caused by the difference in viscosity between the gaseous refrigerant and the liquid refrigerant, and ensuring that the gaseous refrigerant is in a liquid state. The distribution in the refrigerant is uniform.

Preferably, the bubble breaking structure is a filter net, and the filter net is fixedly disposed in the accommodating cavity. The filter has a good effect as a bubble breaking structure, and the cost is low. In the embodiment, a filter holder 31 is further fixedly disposed in the accommodating cavity. The filter net includes a mesh surface 32 and a skeleton 33. The skeleton 33 is fixedly connected with the filter holder 31, and the mesh surface 32 is disposed outside the skeleton 33. The large bubble is cut by the filter to divide the large bubble into a plurality of small bubbles, the structure is simple, the parts are arranged less, the processing is convenient, and the current sharing effect is good.

In the present embodiment, the skeleton 33 is spiral, and the cross-sectional area of the skeleton 33 gradually increases in the flow direction of the fluid, and the gap between the adjacent two spirals of the skeleton 33 is provided. The spiral skeleton can form a good support for the mesh surface 32, ensuring that the filter mesh can work stably under the impact of the liquid, ensuring the structural strength of the filter mesh and improving the service life of the filter mesh. The mesh surface 32 is formed into a truncated cone shape, which can effectively disperse the impact force of the liquid, improve the service life, and optimize the force structure.

Preferably, in order to ensure that the filter holder 31 is stable, the filter holder 31 is prevented from moving under the impact of the liquid, and the limiting protrusion 24 is further disposed on the tube shell 2, and the limiting protrusion 24 is convex toward the axis of the tube casing 2, and the limit is limited. The projections 24 are respectively located at both ends of the screen holder 31 in the fluid flow direction.

In other embodiments, the bubble breaking structure includes a substrate and a vent hole penetrating the substrate, and the substrate is fixedly disposed within the bulb 2. The bubble breaking structure may be other structures as long as it is possible to ensure that large bubbles are broken.

In the present embodiment, the flow equalization portion 6 is located below the pretreatment portion, and the flow equalization portion 6 is a flow equalizer, and the inlet of the flow equalizer and the fluid outlet 22 are in communication with the pretreatment portion.

According to another aspect of the present invention, an air conditioner includes a first heat exchanger, a second heat exchanger, and a flow equalizing device, and the flow equalizing device is connected between the first heat exchanger and the second heat exchanger, and the current sharing device is The above current sharing device.

In the present embodiment, the fluid inlet 21 of the flow equalization device is in communication with the outlet of the first heat exchanger, and the liquid-collecting capillary 7 of the flow equalization portion is in communication with the inlet of the second heat exchanger, the fluid inlet 21 and the fluid of the pre-treatment portion The outlet 22 is vertically downward.

In the cooling mode, after the refrigerant is throttled by the electronic expansion valve, the refrigerant enters the tube casing 2 through the fluid inlet pipe 1, and after being buffered in the casing 2, flows through the filter mesh, and the filter mesh breaks up the large bubbles, and the small bubbles accompany The liquid refrigerant continues to flow to the fluid outlet 22, enters the fluid outlet pipe 5, and finally enters the liquid separation capillary 7 from the equalizing portion 6 to enter the second heat exchanger of the indoor unit for heat exchange.

Preferably, the angle of installation of the flow equalizing device requires the fluid inlet 21 and the fluid outlet 22 to be vertically downward.

The throttled gas-liquid two-phase refrigerant flow enters the accommodating cavity of the casing 2, and since the pipe diameter of the casing 2 is larger than the diameter of the fluid inlet pipe 1, the flow velocity of the gas-liquid two-phase refrigerant flow is reduced, and under the action of the filter mesh The large bubbles in the gas phase of the gas-liquid two-phase refrigerant flow are divided into small bubbles, which are more easily trapped by the disordered flow of the liquid phase, thereby avoiding delamination of the gas-liquid two phases in the accommodating cavity. The refrigerant does not form a distinct continuous mainstream zone during the flow of the accommodating chamber. Due to the distance between the end of the shell 2 and the fluid outlet 22, this distance creates a buffering effect, further weakening the centrifugal force formed by the sudden change of the flow direction. Only at the fluid outlet 22 due to the sudden decrease in the flow cross-sectional area, the flow rate increases. In the case where the length of the straight pipe section of the fluid outlet pipe 5 is small, it is ensured that the refrigerant is uniformly mixed before entering the flow divider.

The fluid inlet 21 and the fluid outlet 22 are vertically downward, that is, the flow equalizer is vertically downward, so that the gas-liquid two-phase refrigerant can flow through the filter screen of the accommodating chamber of the bulb 2, and the bubble is relatively distributed under the influence of gravity. On the upper side of the envelope 2, and the fluid outlet 22 on the lower side, the gas-phase refrigerant around the fluid outlet 22 can be uniformly sucked into the fluid outlet tube 5, facilitating outflow uniformity.

The diameters of the fluid inlet pipe 1 and the fluid outlet pipe 5 are both much smaller than the pipe diameter of the casing 2, for example, the diameters of the fluid inlet pipe 1 and the fluid outlet pipe 5 are φ9.52 mm, and the pipe diameter of the casing 2 is φ25 mm. .

In the conventional structure, the refrigerant passes through the L-shaped tube to cause flow segregation under the action of centrifugal force. The tube 2 of a circular cross section having a larger diameter can reduce the centrifugal force. When the refrigerant enters the accommodating chamber, the flow rate thereof is reduced, and the flow distribution of the refrigerant at the fluid outlet 22 is relatively uniform after being buffered by the stagnation region.

The refrigerant entering the accommodating chamber is a gas-liquid two-phase refrigerant flow. Due to the action of gravity and viscous force, the two-phase refrigerant flow is easy to stratify and the gas phase flow rate is fast, and the liquid phase flow rate is slow, which easily leads to uneven liquid distribution. Increasing the filter net can make the gaseous refrigerant entering the accommodating chamber not easy to stick into large bubbles, and the small bubbles are more susceptible to being trapped by the liquid fluid, so it is easier to fully mix the two-phase flow through the stagnation zone, and only the two-phase flow is fully mixed, Local segregation of the flow rate is formed.

In summary, the two-phase refrigerant flow can be sufficiently mixed and the centrifugal effect can be weakened by the flow equalizing device, and it has been experimentally confirmed that the current sharing device completely satisfies the performance requirements.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the current sharing device avoids the phenomenon that the product performance consistency is poor due to the deviation of the installation angle of the current equalizer, and the current sharing can be achieved. The distribution of the refrigerant before the device is relatively uniform, and the influence of the uneven amount of the refrigerant before the flow equalizer on the length of the liquid separation capillary is eliminated in the evaporator branch matching, and the development efficiency can be improved. The current sharing device can reduce the dependence of the heat exchange efficiency of the evaporator on the installation angle of the current equalizer. It is verified by experiments that the influence of the rotation of the current equalizer on the performance is within 3%, and the pipeline or parts before the current sharing device are changed. The influence of the heat transfer effect of the evaporator branch is reduced, the development efficiency can be improved, the filter net is arranged in the tube casing, the gas-liquid two-phase flow state is optimized, and the practical problem is solved without increasing the number of pipeline parts. The distributor with the current sharing effect can effectively ensure the consistency of product performance.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A current sharing device, comprising:

a pretreatment portion having a casing (2), the casing (2) is provided with a fluid inlet (21) and a fluid outlet (22), and the casing (2) has a receiving chamber therein a bubble breaking structure for dispersing air bubbles is disposed in the accommodating cavity, and the bubble breaking structure is located between the fluid inlet (21) and the fluid outlet (22);

a current equalizing portion (6) that communicates with the pretreatment portion and is located downstream of the pretreatment portion.
The flow equalizing device according to claim 1, wherein the pretreatment portion further comprises a fluid inlet pipe (1) and a fluid outlet pipe (5), and the fluid inlet pipe (1) is fixedly disposed on the pipe a casing (2) and communicating with the accommodating chamber through the fluid inlet (21), the fluid outlet pipe (5) being fixedly disposed on the casing (2) and passing through the fluid outlet (22) ) communicating with the receiving chamber, the flow equalizing portion (6) being connected to the fluid outlet tube (5).
A flow equalization device according to claim 2, characterized in that the tube diameter of the envelope (2) is larger than the diameter of the fluid inlet tube (1).
The flow equalizing device according to claim 1, wherein the bubble breaking structure is a filter mesh, and the filter mesh is fixedly disposed in the receiving cavity.
The flow sharing device according to claim 4, wherein a filter holder (31) is further fixedly disposed in the receiving cavity, the filter net comprising a mesh surface (32) and a skeleton (33), the skeleton (33) fixedly coupled to the screen support (31), the mesh surface (32) being disposed outside the skeleton (33).
The flow equalizing device according to claim 5, wherein the skeleton (33) is spiral, and a cross-sectional area of the skeleton (33) gradually increases in a flow direction of the fluid, the skeleton (33) There is a gap between two adjacent spirals.
The current equalizing device according to claim 1, wherein the bubble breaking structure comprises a substrate and a vent hole penetrating the substrate, and the substrate is fixedly disposed in the envelope (2).
The current sharing device according to claim 5, characterized in that the tube casing (2) is further provided with a finite position protrusion (24), the limiting protrusion (24) facing the tube casing (2) The axis protrusions are located, and the limiting protrusions (24) are respectively located at two ends of the filter holder (31) in the fluid flow direction.
An air conditioner comprising a first heat exchanger, a second heat exchanger and a current sharing device, the flow sharing device being connected between the first heat exchanger and the second heat exchanger, characterized in that The current equalizing device is the current sharing device according to any one of claims 1 to 8.
The air conditioner according to claim 9, wherein the fluid inlet (21) of the flow equalizing device is in communication with the outlet of the first heat exchanger, and the liquid sharing portion (6) of the flow sharing device is divided. A capillary tube (7) is in communication with the inlet of the second heat exchanger, and the fluid inlet (21) and the fluid outlet (22) of the pretreatment portion of the flow equalization device are vertically downward.