KR100562837B1 - Heat pump system having heat exchanger - Google Patents

Abstract

The present invention forms an expansion tube in any one of the refrigerant pipes formed on the refrigerant outlet side of the indoor heat exchanger, the outdoor heat exchanger and the four-way valve during heating, and is connected to the outlet side of the compressor around the expansion tube. The heat exchange structure of the heat pump system to fix the heat exchange area to increase the heat exchange area by fixedly attaching the refrigerant pipe flowing high temperature refrigerant to the heat exchange system, the tube fixedly attached to the expansion tube in a coil or zigzag shape will be.

    Heat pump, heat exchanger, expansion tube, ring tube, heat exchanger tube

Description

   Refrigerant heat exchange structure of heat pump system {heat pump system having heat exchanger}

1 is a schematic diagram of a conventional heat pump cycle.

2A and 2B are refrigerant flow diagrams of a conventional heat pump cycle.

Figure 3 is a flow chart showing the flow of refrigerant during heating of the heat pump system according to an embodiment of the present invention.

Figure 4 is a flow chart showing the flow of the refrigerant during cooling of the heat pump system according to an embodiment of the present invention.

Figure 5 is a perspective view showing a heat exchanger provided on the heat pump system according to an embodiment of the present invention.

Figure 6 is a perspective view showing a heat exchanger provided on a heat pump system according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

1: compressor 3: indoor heat exchanger

4: four-way valve 5: refrigerant pipe

20: liquid separator 40: outdoor heat exchanger

60: heat exchanger 62a, 62b: expansion tube

63, 65: 1st and 2nd ring 66: heat exchanger tube

The present invention relates to a refrigerant heat exchange structure of a heat pump system, and more particularly, an expansion tube is attached to one of the refrigerant tubes formed at the refrigerant outlet side of each of the indoor heat exchanger, the outdoor heat exchanger, and the four-way valve during heating. And a heat exchange area connected to the outlet side of the compressor and fixedly attached to each other so as to exchange heat with each other, and the tube fixedly attached to the expansion tube has a coil or zigzag shape. The refrigerant heat exchange structure of the heat pump system to increase the.

The heat pump is one of the air conditioners that can serve both cooling and heating by reversing the flow of refrigerant in the cooling cycle of the air conditioner. Increasingly, the area of use is gradually expanding.

As shown in FIG. 1, a heat pump cycle generally includes a compressor 11 for compressing a refrigerant and an outdoor heat exchanger connected to the compressor 11 through a pipe to act as a condenser during cooling and an evaporator for heating. And a heat exchanger (13), which is connected to the compressor (12) and the pipe by the pipe and acts as an evaporator when cooling, and as a condenser when heating, and a high temperature and high pressure refrigerant from the compressor (11). Is provided to the outdoor heat exchanger 12 for cooling and the four-way valve 14 for supplying to the indoor heat exchanger 13 for heating, and installed below the outdoor heat exchanger 12 for heating. 12 and a subcooler 16 for preventing freezing of the condensed water, and an expansion valve 15 made of a two-phase refrigerant by expanding the condensed refrigerant installed on the outdoor side.

Here, the expansion valve 15 is installed in a pipe connecting the outdoor heat exchanger 12 and the subcooler 16, and a super cooler 16 in the pipe connecting the subcooler 16 and the indoor heat exchanger 13. A check valve 17 is provided to block the flow of refrigerant from the filter.

Therefore, a bypass pipe is connected between the two pipes so that the refrigerant passing through the expansion valve 15 can be supplied to the indoor heat exchanger 13 without passing through the check valve 17.

In the conventional heat pump cycle configured as described above, the four-way valve 14 sends the high temperature and high pressure refrigerant from the compressor 11 to the indoor heat exchanger 13 or the outdoor heat exchanger 12 according to the cooling or heating selection. This will cool or heat the room.

That is, the refrigerant at the time of cooling, the compressor 11 → four-way valve 14 → outdoor heat exchanger 12 → expansion valve 15 → indoor heat exchanger 13 → compressor 11 as shown in Fig. 2A. Cooling is achieved through the circulation path of).

 Then, the refrigerant during heating is, as shown in Figure 2b, the compressor 11 → four-way valve 14 → indoor heat exchanger 13 → check valve 17 → supercooler 16, expansion valve 15 ) → The outdoor heat exchanger (12) → The heating path is achieved through the circulation path of the compressor (11).

However, the conventional heat pump cycle configured as described above has a problem in that when the outside temperature is gradually lowered during heating, the heating load is increased to overload the compressor and noise is generated due to the overload operation of the compressor.

The present invention has been proposed to solve the above problems of the prior art, by contacting the tube connected to the discharge side refrigerant pipe of the compressor for guiding the high temperature refrigerant to the expansion tube formed in the refrigerant tube flowing a refrigerant of lower temperature It is an object of the present invention to provide a refrigerant heat exchange structure of a heat pump system capable of preventing an overload of a compressor by increasing a temperature of a refrigerant whose temperature is lowered by an external cold temperature during the heating and entering the compressor.

The refrigerant heat exchange structure of the heat pump system according to the present invention for achieving the above object is a compressor, a four-way valve, an indoor heat exchanger, a cooling expansion tube, a liquid separator, a heating expansion tube, an outdoor heat exchanger, the outdoor The indoor heat exchanger, the outdoor heat exchanger and the like when the heat is exchanged with a double pipe which is connected to the heat exchanger and passes through the refrigerant and heat exchanges with the heating expansion tube, The four-way valve is provided in any one of the refrigerant pipes formed on the refrigerant outlet side is characterized by consisting of a heat exchange unit for heat exchange the refrigerant.

In addition, the heat exchange part according to an embodiment of the present invention is formed in the refrigerant pipes required among the refrigerant pipes connected to the refrigerant outlets of the indoor heat exchanger, the outdoor heat exchanger, and the four-way valve, and expands the storage capacity of the flowing refrigerant. A first ring pipe wound around the upper part of the expansion pipe and introducing a refrigerant in a high temperature state generated in a circulation cycle to exchange heat with the refrigerant inside the expansion pipe; Branched pipes extending in contact with each other to increase the contact area with the extension pipes and increasing the heat exchange rate between the refrigerants, and a refrigerant heat exchanged around the lower end of the extension pipes and connected to the ends of the branch pipes. And a second ring tube guiding to be circulated on the circulation cycle.

In addition, the heat exchanger according to another embodiment of the present invention, the expansion tube formed in the required refrigerant tube of the refrigerant pipe connected to the refrigerant outlet side of each of the indoor heat exchanger, the outdoor heat exchanger and the four-way valve, and along the circumference of the expansion tube By expanding the contact area by winding in coil shape or zigzag shape, inflow of high temperature refrigerant generated in circulation cycle increases the heat exchange rate with the refrigerant inside the expansion tube, and heat exchanger tube which guides the heat exchanged refrigerant onto the circulation cycle. Characterized in that the configuration.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

3 is a flow chart showing the flow of the refrigerant during the heating of the heat pump system according to an embodiment of the present invention, Figure 4 is a flow chart showing the flow of refrigerant during cooling of the heat pump system according to an embodiment of the present invention. .

And, Figure 5 is a perspective view showing a heat exchanger provided on the heat pump system according to an embodiment of the present invention, Figure 6 is a perspective view showing a heat exchanger provided on the heat pump system according to another embodiment of the present invention.

As shown in Figure 3 and 4, the refrigerant heat exchange structure of the heat pump system according to an embodiment of the present invention is a compressor (1), four-way valve (4), indoor heat exchanger (3), cooling expansion tube (10) ), A liquid separator 20, a heating expansion tube 30, an outdoor heat exchanger 40, a double pipe 50 and a heat exchanger (60).

At this time, the compressor (1), four-way valve (4), indoor heat exchanger (3), cooling expansion tube (10), liquid separator (20), heating expansion tube (30), outdoor heat exchanger (40), double pipe ( 50 and each of the heat exchanger 60 are connected to the refrigerant pipe 5 to guide the flow of the refrigerant.

The compressor 1 performs a function of compressing a refrigerant and converting the refrigerant into a high temperature and high pressure state.

In addition, the four-way valve (4) is formed on the outlet side of the compressor (1) to switch the flow of the refrigerant in the direction of the indoor heat exchanger (3) when heating, the direction of the double pipe (50) when cooling.

The indoor heat exchanger (3) serves as a condenser to condense the refrigerant during the heating operation, serves as an evaporator to evaporate the refrigerant during the cooling operation, and performs heat exchange by release or absorption.

In addition, the cooling expansion tube 10 is expanded to the heat exchanged refrigerant during cooling and guides to the indoor heat exchanger (3).

At this time, the cooling expansion tube 10 is connected in parallel with the check valve (80).

Thus, during heating, the refrigerant moves from the indoor heat exchanger 3 to the liquid separator 20 through the check valve 80, and during cooling, the refrigerant moves from the liquid separator 20 to the indoor heat exchanger through the cooling expansion tube 10. Guided to (3) and inflated.

In addition, the liquid separator 20 is connected to the cooling expansion tube 10 and filters the refrigerant in the liquid phase of the refrigerant flowing into the compressor 1 during heating, so that only the refrigerant in the gas phase compressor 1 By increasing the durability of the compressor (1).

On the other hand, the heating expansion pipe 30 is connected to the liquid separator 20 to expand the refrigerant passing through the liquid separator 20 during heating.

In addition, the outdoor heat exchanger 40 prevents freezing by the external cold at the time of converting the refrigerant into a low temperature low pressure gas refrigerant during the heating operation, and condenses the refrigerant during the cooling operation.

Meanwhile, as illustrated in FIGS. 3 and 4, the double pipe 50 includes the heating expansion pipe 30, and guides the refrigerant in the low temperature and low pressure state during heating to pass through the heating expansion pipe 30. Heat exchange with.

The reason why the double tube 50 contains the heating expansion tube 30 is to allow mutual heat exchange while being installed in a simple structure for the flow of the refrigerant.
In addition, during heating, the flow direction of the refrigerant flowing through the double tube 50 and the flow direction of the refrigerant flowing through the heating expansion tube 30 built in the double tube 50 are different from each other.
Of course, when cooling, the refrigerant flow direction of the double pipe 50 and the refrigerant flow direction of the heating expansion pipe 30 is the same.

In addition, as an embodiment, the refrigerant in the low temperature low pressure state transferred through the double pipe 50 during heating is diverted through the four-way valve 4 and guided to the heat exchange unit 60.
That is, the heat exchanger 60 is one end is connected to the refrigerant outlet side of the four-way valve 4 when heating, and the other end is provided in the refrigerant pipe (5) connected to the refrigerant inlet side of the liquid separator 20. do.
At this time, the liquid separator 20 is connected to the indoor heat exchanger (3), the cooling expansion tube (10) and the heating expansion tube (30) continuously and in sequence to the refrigerant tube (5) for guiding the refrigerant in the above order; In addition, the double pipe 50, the four-way valve 4, the heat exchanger 60 and the compressor 1 are continuously and sequentially connected to insert the refrigerant pipe 5 for guiding the refrigerant in the above order.
Thus, the pair of refrigerant pipes 5 simultaneously inserted into the liquid separator 20 guide the refrigerant in the same direction when heating, and guide the refrigerant in different directions when cooling.
In particular, the heat exchanger 60 is formed on the refrigerant pipe 5 that connects the double pipe 50, the four-way valve 4, and the compressor 1 continuously and sequentially.
Of course, the heat exchanger 60 may be formed in the refrigerant pipe 5 corresponding to the refrigerant outlet side of the indoor heat exchanger 3 or the outdoor heat exchanger 40, but is not illustrated.

As shown in FIG. 5, the heat exchanger 60 is a refrigerant required among the refrigerant pipes 5 connected to the refrigerant outlets of the indoor heat exchanger 3, the outdoor heat exchanger 40, and the four-way valve 4, respectively. The expansion pipe (62a) formed in the tube (5), the storage capacity of the flowing refrigerant is increased, and the expansion pipe by introducing a high-temperature refrigerant generated in the circulation cycle wound around the upper portion of the expansion pipe (62a) (62a) extends in contact with the expansion pipe (62a) around the lower portion of the first ring pipe 63 and the lower portion of the first ring pipe (63a) to increase the contact area with the expansion pipe (62a) As a result, the branch pipe 64 having increased heat exchange rate between the refrigerant and the branch pipe 64 is wound around the lower portion of the expansion pipe 62a and connected to the ends of the branch pipe 64 to guide the heat exchanged refrigerant to be circulated in the circulation cycle. It consists of a second ring tube (65).

In particular, the heat exchange part 60 is extended on the refrigerant pipe (5) formed to pass through the four-way valve (4) for the refrigerant of the low temperature and low pressure state passing through the double pipe (50) temporarily larger than the refrigerant pipe (5) The tube 62a is formed.

That is, the expansion pipe 62a is preferably formed on the refrigerant pipe 5 connecting the double pipe 50 and the liquid separator 20.

This is because the refrigerant flowing through the double pipe 50, the four-way valve 4, and the liquid separator 20 continuously and sequentially during heating is a low-temperature, low-pressure state, and is a mixed refrigerant of the gas phase and the liquid phase. By contacting the refrigerant tube 5 between the compressor 1 and the indoor heat exchanger 3, which flows a high temperature refrigerant during heating around the expansion tube 62a of the low temperature, the low temperature refrigerant exchanges heat with the high temperature refrigerant and expands. This is because the liquid refrigerant phase changes into the gas phase inside the tube.

In addition, the expansion pipe 62a forms a first ring pipe 63 around the upper portion, and the first ring pipe 63 introduces a high-temperature refrigerant flowing out of the compressor 1 during heating.

In addition, the first ring tube 63 integrally forms a plurality of branch pipes 64 spaced apart from each other around the lower portion to guide the introduced refrigerant downward.

The second ring tube (65) is formed around the lower portion of the expansion tube (62a) serves to guide the refrigerant to the indoor heat exchanger (3) by collecting the refrigerant passing through each branch pipe (64) when heating.

At this time, since the refrigerant passing through the first ring tube 63, the branch pipe 64, and the second ring tube 65 is in a high temperature state, the refrigerant is exchanged with the low temperature refrigerant inside the expansion tube 62a.

The first ring tube 63, the branch tube 64, and the second ring tube 65 are firmly attached by welding to the expansion tube 62a to improve the heat exchange rate.

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On the other hand, as shown in Figure 6, the heat exchange unit 60 of the refrigerant pipes 5 connected to the refrigerant outlet side of each of the indoor heat exchanger 3, the outdoor heat exchanger 40 and the four-way valve (4). Expansion tube 62b formed in the refrigerant tube 5 required and coils or zigzag coils are wound along the circumference of the expansion tube 62b to expand the contact area, thereby introducing and expanding a high-temperature refrigerant generated in a circulation cycle. It consists of a heat exchanger tube 66 which increases the heat exchange rate with the refrigerant in the tube 62b and guides the heat exchanged refrigerant onto the circulation cycle.

In particular, as described above, the heat exchanger 60 is an expansion pipe (5) on the refrigerant pipe 5 directly connecting the refrigerant outlet side of the four-way valve 4 and the refrigerant inlet side of the liquid separator 20 during heating. 62b) to temporarily store and flow the refrigerant in a low-temperature two-phase state, and on the refrigerant pipe 5 connecting the compressor 1 and the indoor heat exchanger 3 to the expansion pipe 62b. By winding the provided heat exchange tube 66 in a coil shape or a zigzag shape, it is possible to exchange heat between the refrigerant inside the expansion tube 62b and the refrigerant inside the heat exchange tube 66.

In addition, the expansion tube 62b may be a refrigerant tube 5 between the compressor 1 and the indoor heat exchanger 3, or may be a separate tube connecting the refrigerant tubes.

At this time, the heat exchange tube 66 is fixed to the welded expansion tube 62b.

Referring to the refrigerant flow of the heat pump system according to the present invention described above are as follows.

First, as shown in Figure 3, in the heating mode, the refrigerant is a compressor (1) → four-way valve (4) → indoor heat exchanger (3) → cooling expansion tube (10) and check valve (80) → liquid separator ( 20) → heating expansion tube (30) → outdoor heat exchanger (40) → double tube (50) → four-way valve (4) → heat exchanger (60) → liquid separator (20) → compressor (1) .

And, as shown in Figure 4, in the cooling mode, the refrigerant is a compressor (1) → four-way valve (4) → double tube (50) → outdoor heat exchanger (40) → heating expansion tube (30) → liquid separator (20) Cooling is achieved by passing through the circulation path of the cooling expansion tube (10), an indoor heat exchanger (3), a four-way valve (4), a heat exchanger (60), a liquid separator (20), and a compressor (1).

As described above, according to the refrigerant heat exchange structure of the heat pump system according to the present invention, a larger diameter is temporarily formed on the refrigerant pipe for flowing the refrigerant in a low temperature state to increase the flow amount of the refrigerant flowing therein, By contacting the refrigerant pipe for flowing the refrigerant in a high temperature state around the expansion pipe has an effect of preventing the overload of the compressor by raising the temperature of the refrigerant flowing into the compressor during heating.

Claims (5)

A compressor for compressing the refrigerant; A four-way valve connected to the refrigerant discharge side of the compressor to switch the flow of the refrigerant; An indoor heat exchanger configured to condense the refrigerant transferred from the compressor during the heating operation to discharge high temperature heat and to discharge the cold air as the refrigerant evaporates during the cooling operation to perform heat exchange; A cooling expansion tube connected to the indoor heat exchanger to compensate for the lowered refrigerant temperature while passing through the indoor heat exchanger and to expand the heat exchanged refrigerant during cooling; A liquid separator connected to the cooling expansion tube and separating a liquid refrigerant from the refrigerant flowing into the compressor during heating; A heating expansion tube connected to the liquid separator to expand the delivered refrigerant; An outdoor heat exchanger connected to the heating expansion tube to condense the refrigerant and discharge heat during the cooling operation, and evaporate the refrigerant and absorb the heat during the heating operation; A double pipe connected to the outdoor heat exchanger and passing through a refrigerant, and including the heating expansion pipe to exchange heat with each other; It is provided in any one of the refrigerant pipes formed on the refrigerant outlet side of each of the indoor heat exchanger, the outdoor heat exchanger and the four-way valve during heat exchange with the refrigerant pipe for guiding the refrigerant in a high temperature state on the refrigerant discharge side of the compressor. Refrigerant heat exchange structure of the heat pump system, characterized in that it comprises a heat exchange unit for heat exchange the refrigerant. The method of claim 1, The heat exchange part is formed in a refrigerant pipe required among refrigerant pipes connected to the refrigerant outlets of the indoor heat exchanger, the outdoor heat exchanger, and the four-way valve, and the expansion pipe increases the storage capacity of the flowing refrigerant; A first ring pipe wound around an upper portion of the expansion pipe and introducing a high temperature refrigerant generated in a circulation cycle to exchange heat with the refrigerant inside the expansion pipe; A branch pipe extending in contact with the expansion pipe around the lower portion of the first ring pipe to increase a contact area with the expansion pipe, thereby increasing heat exchange rate between the refrigerants; Refrigerant heat exchange structure of the heat pump system, characterized in that it is wound around the lower portion of the expansion pipe is connected to the end of each of the branch pipes to collect the heat exchanged refrigerant to be circulated in the circulation cycle. The method of claim 2, Refrigerant heat exchange structure of the heat pump system, characterized in that the first ring pipe, branch pipe and the second ring pipe is fixed to the welded expansion pipe. The method of claim 1, The heat exchange part includes an expansion pipe formed in a refrigerant pipe required among refrigerant pipes connected to the refrigerant outlets of the indoor heat exchanger, the outdoor heat exchanger, and the four-way valve; A coil or zigzag is wound along the circumference of the expansion tube to widen the contact area, thereby introducing a high temperature refrigerant generated in a circulation cycle to increase the heat exchange rate with the refrigerant inside the expansion tube, and circulating the heat exchanged refrigerant. Refrigerant heat exchange structure of the heat pump system, characterized in that consisting of a heat exchange tube to guide the cycle. The method of claim 4, wherein The heat exchange tube is a refrigerant heat exchange structure of the heat pump system, characterized in that fixed to the welded expansion tube.

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