External liquid storage heat exchanger

Abstract

The utility model provides a kind of external liquid storage heat exchanger, including heat exchange shell and heat exchange tube, the heat exchange shell has heat exchange inner chamber, heat exchange shell is equipped with external refrigerant liquid reservoir, external refrigerant liquid reservoir is connected with refrigerant supply source by refrigerant input liquid pipe, heat exchange tube is installed in heat exchange inner chamber and is coiled in heat exchange inner chamber, heat exchange chamber is equipped with the refrigerant connecting pipe being communicated with external refrigerant liquid reservoir, refrigerant connecting pipe has extension pipe part, at least one evaporative oil return hole is opened in extension pipe part, evaporative oil return hole is arranged on the extension pipe part corresponding with heat exchange tube distribution section position. Simple structure, effectively avoid the mutual interference of heat exchange inner chamber and the refrigerant heat of external refrigerant liquid reservoir, and improve the effective heat exchange space in heat exchanger, improve heat exchange effect;While effectively solve the oil return problem under the condition of low frequency or less refrigerant, avoid the problem of compressor oil shortage.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchangers, specifically an external liquid storage heat exchanger. Background Technology

[0002] With the continuous improvement of living standards, existing heat pump systems are widely used, utilizing the heat absorption and release phenomena generated by the liquid and gas phase changes of the refrigerant. For example, in the air conditioning cooling process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses into a liquid in the condenser. It then passes through a throttling device to reduce its pressure, and finally enters the heat exchanger to absorb heat and evaporate, returning to the compressor as vapor, thus realizing the refrigeration cycle and regulating the temperature of the medium or the surrounding environment. In the air conditioning heating process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses in the heat exchanger. It then passes through a throttling device to reduce its pressure, and finally enters the evaporator to absorb heat and evaporate into a gas, flowing back to the compressor.

[0003] Most of the evaporators mentioned above use flooded heat exchangers. Flooded heat exchangers are the most common heat exchange components. They mainly consist of a heat exchange shell for storing refrigerant and heat exchange tubes for the flow of the medium. The heat exchange shell has a heat exchange cavity, and the heat exchange tubes are installed in the heat exchange cavity. The inlet and outlet ends of the heat exchange tubes are respectively connected to a working fluid inlet pipe and a working fluid outlet pipe. At the same time, the heat exchange cavity is connected to a refrigerant inlet pipe and a refrigerant outlet pipe.

[0004] During operation, the refrigerant and refrigeration oil undergo large-space boiling within the heat exchanger shell, resulting in high energy efficiency.

[0005] However, the heat exchanger with the above structure has the following shortcomings during use:

[0006] 1) The heat exchanger with the above structure has a built-in liquid reservoir. The working fluid temperature of the built-in liquid reservoir and the heat exchanger will interfere with each other, resulting in a large heat loss.

[0007] 2) The heat exchanger with the above structure has a built-in liquid reservoir. Due to the size limitation, the liquid storage space that the heat exchanger can use is limited. If the liquid storage volume is too high, it will reduce the heat exchange performance of the heat exchanger.

[0008] 3) Heat exchangers with built-in liquid receivers may cause compressor oil shortage if a certain amount of oil is stored, affecting the normal use of the product. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by proposing an external liquid storage heat exchanger.

[0010] The objective of this invention is achieved as follows: An external liquid storage heat exchanger includes a heat exchange shell for storing refrigerant and a heat exchange tube for supplying heat exchange to the working fluid. The heat exchange shell has a heat exchange inner cavity, wherein the heat exchange shell is provided with an external refrigerant reservoir. The external refrigerant reservoir is connected to a refrigerant supply source through a refrigerant inlet pipe. The heat exchange tube is installed in the heat exchange inner cavity and coiled around the heat exchange inner cavity. The heat exchange inner cavity is provided with a refrigerant connecting pipe communicating with the external refrigerant reservoir. The refrigerant connecting pipe has an extension section, and the extension section has at least one evaporation return oil hole, which is located on the extension section corresponding to the distribution segment of the heat exchange tube.

[0011] Based on the above optimization, the heat exchange shell is provided with a heat insulation layer, which is fixedly connected between the heat exchange shell and the external refrigerant reservoir.

[0012] Based on the above optimization, the heat exchange shell is provided with a central assembly cavity adapted to the installation of an external refrigerant reservoir, and the refrigerant input pipe is installed on the external refrigerant reservoir and extends to the upper part of the external refrigerant reservoir.

[0013] Based on the above optimization, the inlet of the refrigerant input pipe is located above the refrigerant connection pipe, and the top end of the extension section of the refrigerant connection pipe is located below the external refrigerant reservoir.

[0014] Based on the above optimization, the evaporator oil return holes are evenly distributed from top to bottom on the extension pipe, so that the evaporator oil return holes are formed into multi-segment oil return holes that can be used for oil return when the frequency is low or the refrigerant is low.

[0015] Based on the above optimization, the heat exchange tube is coiled from top to bottom inside the heat exchange cavity, so that the heat exchange tube forms sensible heat exchange tube sections and subcooled heat exchange tube sections with equal pitch. The connection port of the refrigerant connection pipe is located below the subcooled heat exchange tube section and communicates with the heat exchange cavity. The evaporation oil return hole is distributed on the extension tube section corresponding to the connection port of the subcooled heat exchange tube section and the refrigerant connection pipe.

[0016] Based on the above optimization, the heat exchange shell is provided with a refrigerant outlet pipe, a medium inlet pipe and a working medium outlet pipe. The medium inlet pipe and the working medium outlet pipe are diagonally distributed on the medium inlet pipe and the working medium outlet pipe of the heat exchange shell and are connected to the liquid inlet and liquid outlet of the heat exchange tube. The refrigerant outlet pipe is installed on the upper part of the heat exchange shell and is connected to the heat exchange inner cavity.

[0017] Based on the above optimization, the heat exchange inner cavity is coiled with at least one heat exchange tube.

[0018] The advantages of this utility model are:

[0019] 1) By adding an external refrigerant receiver, the heat of the refrigerant in the heat exchange chamber and the external refrigerant receiver can be effectively prevented from interfering with each other, thus reducing the heat loss of the heat exchanger.

[0020] 2) The external refrigerant receiver with this structure, in conjunction with the refrigerant connection pipe and the heat exchange cavity, can achieve complete filling of the external refrigerant receiver due to the influence of exhaust pressure, thereby increasing the effective heat exchange space within the heat exchanger and improving the heat exchange effect.

[0021] 3) Because the refrigerant connection pipe is equipped with an evaporator oil return hole, it effectively solves the oil return problem in low-frequency or low refrigerant conditions, and avoids problems caused by compressor oil shortage. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0023] Appendix Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] According to the appendix Figures 1 to 2 As shown, the external liquid storage heat exchanger of this utility model includes a heat exchange shell 1 for storing refrigerant and a heat exchange tube 2 for supplying heat exchange of the working fluid. The heat exchange shell 1 has a heat exchange inner cavity 11. The heat exchange shell 1 is equipped with an external refrigerant reservoir 3, which is connected to a refrigerant supply source via a refrigerant inlet pipe 10. The heat exchange tube 2 is installed in and coiled around the heat exchange inner cavity 11. The heat exchange inner cavity 11 is provided with a refrigerant connecting pipe 4 communicating with the external refrigerant reservoir 3. The refrigerant connecting pipe 4 has an extension section 41, and the extension section 41 has at least one evaporation return oil hole 5 located on the extension section 41 corresponding to the distribution segment of the heat exchange tube 2.

[0026] In actual operation, the heat exchange shell 1 is provided with a central assembly cavity 12 adapted to the installation of the external refrigerant reservoir 3, and the refrigerant input pipe 10 is installed on the external refrigerant reservoir 3 and extends to the upper part of the external refrigerant reservoir 3.

[0027] By installing the external refrigerant reservoir 3 in the central assembly cavity 12 of the heat exchange shell 1, and adopting an external assembly method, the heat exchange inner cavity 11 and the refrigerant heat of the external refrigerant reservoir 3 interfere with each other.

[0028] Furthermore, the heat exchange shell 1 is provided with a heat insulation layer 6, which is fixedly connected between the heat exchange shell 1 and the external refrigerant reservoir 3.

[0029] The insulation layer 6 further isolates the external liquid reservoir from the heat exchange cavity 11, preventing automatic heat exchange of the refrigerant and greatly reducing heat loss.

[0030] Reference Figures 1 to 2 As shown, further detailed, the heat exchange shell 1 is provided with a refrigerant outlet pipe 7, a medium inlet pipe 8, and a working medium outlet pipe 9. The medium inlet pipe 8 and the working medium outlet pipe 9 are diagonally distributed on the heat exchange shell 1 and are connected to the liquid inlet and liquid outlet of the heat exchange tube 2. The refrigerant outlet pipe 7 is installed on the upper part of the heat exchange shell 1 and is connected to the heat exchange inner cavity 11.

[0031] The inlet of the refrigerant input pipe 10 is located above the refrigerant connection pipe 4, and the top end of the extension pipe 41 of the refrigerant connection pipe 4 is located below the external refrigerant reservoir 3.

[0032] In this way, the external refrigerant reservoir 3 with this structure, together with the refrigerant connecting pipe 4 and the heat exchange inner cavity 11, can be fully filled with liquid due to the influence of the exhaust pressure, thereby increasing the effective heat exchange space in the heat exchanger and improving the heat exchange effect.

[0033] Reference Figures 1 to 2 As shown, further refined, the evaporator oil return holes 5 are evenly distributed from top to bottom on the extension pipe section 41, so that the evaporator oil return holes 5 are formed as multi-segment oil return holes that can be used for oil return when the frequency is low or the refrigerant is low.

[0034] In the optimized scheme, the heat exchange tube 2 is coiled from top to bottom inside the heat exchange inner cavity 11, so that the heat exchange tube 2 forms a sensible heat exchange tube section 21 and a subcooled heat exchange tube section 22 with equal pitch. The connection port of the refrigerant connection pipe 4 is located below the subcooled heat exchange tube section 22 and communicates with the heat exchange inner cavity 11. The evaporation oil return hole 5 is distributed on the extension pipe section 41 corresponding to the connection ports of the subcooled heat exchange tube section 22 and the refrigerant connection pipe 4.

[0035] The shape and connection method of the refrigerant connection pipe 4 are shown in the figure. During operation, the refrigerant enters the external refrigerant receiver 3 from the refrigerant inlet pipe 10. Then, due to the gas pressure inside the refrigerant receiver, the refrigerant enters the heat exchange chamber 11 along the refrigerant connection pipe 4. At the same time, the medium enters the heat exchange tube 2 from the medium inlet pipe 8, allowing the medium in the heat exchange tube 2 to exchange heat with the refrigerant in the heat exchange chamber 11, causing the refrigerant to release heat during evaporation and condensation. At this time, the medium is heated by fully utilizing the sensible heat and latent heat of the refrigerant, and the heated medium is output through the medium outlet pipe 9. During this period, the vaporized refrigerant can be discharged to the compressor from the refrigerant outlet pipe 7. Meanwhile, since the refrigerant connection pipe 4 is equipped with multiple oil return holes, when low frequency or insufficient refrigerant supply occurs, the refrigerant flows back to the heat exchange chamber 11 through the multiple oil return holes, thereby compensating the compressor and ensuring the normal operation of the compressor.

[0036] It is worth noting that the number of the evaporation return oil holes 5 is one, two, or more than three, and the heat exchange inner cavity 11 is coiled with at least one heat exchange tube 2. The attached drawings of this structure show the assembly situation, that is, the heat exchange inner cavity 11 is coiled with two heat exchange tubes 2 coiled in parallel, which improves the heat exchange efficiency.

[0037] The above specific embodiments are only specific implementations of the present utility model with better effects. All structures that are the same as or equivalent to the external liquid storage heat exchanger of the present utility model are within the protection scope of the present utility model.

Claims

1. An external liquid storage heat exchanger, comprising a heat exchange shell (1) for storing refrigerant and a heat exchange tube (2) for heat exchange of the medium, wherein the heat exchange shell (1) has a heat exchange cavity (11), characterized in that: The heat exchange shell (1) is provided with an external refrigerant reservoir (3). The external refrigerant reservoir (3) is connected to a refrigerant supply source through a refrigerant inlet pipe (10). The heat exchange tube (2) is installed in the heat exchange inner cavity (11) and coiled around the heat exchange inner cavity (11). The heat exchange inner cavity (11) is provided with a refrigerant connecting pipe (4) that communicates with the external refrigerant reservoir (3). The refrigerant connecting pipe (4) has an extension pipe section (41). The extension pipe section (41) has at least one evaporation oil return hole (5). The evaporation oil return hole (5) is located on the extension pipe section (41) corresponding to the distribution section of the heat exchange tube (2).

2. The external liquid storage heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with a heat insulation layer (6), which is fixedly connected between the heat exchange shell (1) and the external refrigerant reservoir (3).

3. The external liquid reservoir heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with a central assembly cavity (12) adapted to the installation of the external refrigerant reservoir (3), and the refrigerant inlet pipe (10) is installed on the external refrigerant reservoir (3) and extends to the upper part of the external refrigerant reservoir (3).

4. The external liquid reservoir heat exchanger of claim 1, wherein: The inlet of the refrigerant input pipe (10) is located above the refrigerant connection pipe (4), and the top end of the extension pipe (41) of the refrigerant connection pipe (4) is located below the external refrigerant reservoir (3).

5. The external liquid reservoir heat exchanger of claim 1, wherein: The evaporation oil return holes (5) are evenly distributed from top to bottom on the extension pipe (41) so that the evaporation oil return holes (5) are formed as multi-segment oil return holes that can be used for oil return when the frequency is low or the refrigerant is less.

6. The external liquid reservoir heat exchanger of claim 1, wherein: The heat exchange tube (2) is coiled from top to bottom inside the heat exchange cavity (11) so that the heat exchange tube (2) forms a sensible heat exchange tube section (21) and a subcooled heat exchange tube section (22) with equal pitch. The connection port of the refrigerant connection pipe (4) is located below the subcooled heat exchange tube section (22) and communicates with the heat exchange cavity (11). The evaporation oil return hole (5) is distributed on the extension tube section (41) corresponding to the connection port of the subcooled heat exchange tube section (22) and the refrigerant connection pipe (4).

7. The external liquid reservoir heat exchanger of claim 1, wherein: The heat exchange shell (1) is provided with a refrigerant outlet pipe (7), a medium inlet pipe (8) and a medium outlet pipe (9). The medium inlet pipe (8) and the medium outlet pipe (9) are diagonally distributed on the heat exchange shell (1) and are connected to the liquid inlet and liquid outlet of the heat exchange tube (2). The refrigerant outlet pipe (7) is installed on the upper part of the heat exchange shell (1) and is connected to the heat exchange inner cavity (11).

8. The external liquid reservoir heat exchanger of claim 1, wherein: The heat exchange cavity (11) is coiled with at least one heat exchange tube (2).

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