External liquid storage heat exchanger

Abstract

The invention provides an external liquid storage heat exchanger which comprises a heat exchange shell and a heat exchange pipe, the heat exchange shell is provided with a heat exchange inner cavity, the heat exchange shell is provided with an external refrigerant liquid storage device, the external refrigerant liquid storage device is connected with a refrigerant supply source through a refrigerant input liquid pipe, and the heat exchange pipe is installed in the heat exchange inner cavity and wound around the heat exchange inner cavity. The heat exchange cavity is provided with a refrigerant connecting pipe communicated with an external refrigerant liquid storage device, the refrigerant connecting pipe is provided with an extension pipe part, the extension pipe part is provided with at least one evaporation oil return hole, and the evaporation oil return hole is formed in the extension pipe part corresponding to the heat exchange pipe distribution section position. The heat exchanger is simple in structure, mutual interference of refrigerant heat of the heat exchange inner cavity and the external refrigerant liquid storage device is effectively avoided, the effective heat exchange space in the heat exchanger is enlarged, and the heat exchange effect is improved; and meanwhile, the problem of oil return under the condition of low frequency or less refrigerant is effectively solved, and the problem of oil shortage of the compressor is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, in particular to an external liquid storage heat exchanger. Background Art

[0002] As living standards continue to improve, existing heating and cooling heat pumps are widely used. They utilize the heat absorption and release phenomenon generated by the change of refrigerant between liquid and gas phases. For example, during the cooling process of air conditioning, the refrigerant is sucked in and compressed by the compressor, releases heat in the condenser and condenses into a liquid, then passes through a throttle to reduce the pressure, then enters the heat exchanger to absorb heat and evaporate, returning the vapor to the compressor, thus completing the refrigeration cycle and regulating the temperature of the medium or the outside world. During the heating process of air conditioning, the refrigerant is sucked in and compressed by the compressor, releases heat and condenses in the heat exchanger, then passes through a throttle to reduce the pressure, then enters the evaporator to absorb heat and evaporate into a gas that flows back to the compressor.

[0003] Most of the above-mentioned evaporators adopt a flooded heat exchanger. The flooded heat exchanger is the most common heat exchange component, which mainly includes a heat exchange shell for storing refrigerant and heat exchange tubes for medium circulation and heat exchange. The heat exchange shell has a heat exchange inner cavity, and the heat exchange tubes are installed in the heat exchange inner cavity. The liquid inlet and liquid outlet ends of the heat exchange tubes are respectively connected to the working medium input pipe and the working medium output pipe. At the same time, the heat exchange inner cavity is connected to the refrigerant input pipe and the refrigerant output pipe.

[0004] During operation, the refrigerant and refrigeration oil boil in a large space inside the heat exchanger shell, resulting in higher energy efficiency.

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

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

[0007] 2) The heat exchanger of the above structure has a built-in liquid reservoir. Due to volume restrictions, the liquid storage space available in the heat exchanger is limited. If the liquid storage volume is too high, the heat exchange performance of the heat exchanger will be reduced.

[0008] 3) If a heat exchanger with a built-in liquid reservoir stores a certain amount of oil, the compressor will be short of oil, affecting the normal use of the product. Summary of the Invention

[0009] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an external liquid storage heat exchanger.

[0010] The object of the present invention is achieved as follows: an external liquid storage heat exchanger, comprising a heat exchange shell for storing refrigerant and a heat exchange tube for circulating and exchanging working medium, the heat exchange shell having a heat exchange inner cavity, wherein the heat exchange shell is provided with an external refrigerant liquid reservoir, the external refrigerant liquid reservoir is connected to a refrigerant supply source through a refrigerant input liquid pipe, the heat exchange tube is installed in the heat exchange inner cavity and coiled in the heat exchange inner cavity, the heat exchange inner cavity is provided with a refrigerant connecting pipe connected to the external refrigerant liquid reservoir, the refrigerant connecting pipe has an extended pipe portion, the extended pipe portion is provided with at least one evaporation oil return hole, and the evaporation oil return hole is provided on the extended pipe portion corresponding to the distribution section of the heat exchange tube.

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

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

[0013] According to the above optimization, the liquid inlet of the refrigerant input liquid pipe is located above the refrigerant connecting pipe, and the top end of the extended pipe portion of the refrigerant connecting pipe is located below the external refrigerant liquid reservoir.

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

[0015] According to the above optimization, the heat exchange tube is coiled from top to bottom in the heat exchange inner cavity so that the heat exchange tube forms a sensible heat exchange tube section and a subcooling heat exchange tube section with equal pitch. The connection port of the refrigerant connecting tube is below the subcooling heat exchange tube section and is connected to the heat exchange inner cavity. The evaporation oil return hole and the connection ports of the subcooling heat exchange tube section and the refrigerant connecting tube are correspondingly distributed on the extended pipe portion.

[0016] According to the above optimization, the heat exchange shell is provided with a refrigerant outlet pipe, a medium inlet pipe and a medium outlet pipe. The medium inlet pipe and the medium outlet pipe are distributed diagonally on the medium inlet pipe and the medium outlet pipe of the heat exchange shell and are connected with 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 with the heat exchange inner cavity.

[0017] According to the above optimization, at least one heat exchange tube is coiled around the heat exchange inner cavity.

[0018] The advantages of the present invention are:

[0019] 1) By adding an external refrigerant reservoir, the heat interference between the refrigerant in the heat exchange cavity and the external refrigerant reservoir can be effectively avoided, thereby reducing the heat loss of the heat exchanger.

[0020] 2) The external refrigerant liquid reservoir of this structure is coordinated with the refrigerant connecting pipe and the structure of the heat exchange cavity. Under the influence of the exhaust pressure, the external refrigerant liquid reservoir of this structure can be completely filled with liquid, thereby increasing the effective heat exchange space in the heat exchanger and improving the heat exchange effect.

[0021] 3) Since the refrigerant connecting pipe is provided with an evaporation oil return hole, it effectively solves the oil return problem under low frequency or less refrigerant conditions, avoiding the problem of oil shortage in the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 Schematic diagram of the structure of a preferred embodiment of the present invention.

[0023] Attachment Figure 2 It is a cross-sectional view of a preferred embodiment of the present invention. DETAILED DESCRIPTION

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

[0025] According to the attached Figures 1 to 2 As shown, the external liquid storage heat exchanger of the present invention includes a heat exchange shell 1 for storing refrigerant and a heat exchange tube 2 for circulating the working medium for heat exchange. The heat exchange shell 1 has a heat exchange inner cavity 11. The heat exchange shell 1 is provided with an external refrigerant liquid reservoir 3, which is connected to a refrigerant supply source via a refrigerant input liquid pipe 10. The heat exchange tube 2 is installed in the heat exchange inner cavity 11 and coiled in the heat exchange inner cavity 11. The heat exchange inner cavity 11 is provided with a refrigerant connecting pipe 4 that is connected to the external refrigerant liquid reservoir 3. The refrigerant connecting pipe 4 has an extended pipe portion 41. The extended pipe portion 41 is provided with at least one evaporation oil return hole 5. The evaporation oil return hole 5 is provided on the extended pipe portion 41 corresponding to the distribution section of the heat exchange tube 2.

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

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

[0028] Moreover, the heat exchange shell 1 is provided with a heat insulation layer 6 , and the heat insulation layer 6 is fixedly connected between the heat exchange shell 1 and the external refrigerant liquid storage tank 3 .

[0029] Under the action of the heat insulation layer 6, the external liquid storage device and the heat exchange cavity 11 are further isolated, thereby avoiding automatic exchange of refrigerant heat and greatly reducing heat loss.

[0030] Reference Figures 1 to 2 As shown, in further detail, 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 medium inlet pipe 8 and the medium outlet pipe 9 of the heat exchange shell 1 and are connected with 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 with the heat exchange inner cavity 11.

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

[0032] In this way, the external refrigerant liquid storage device 3 of the present structure is coordinated with the refrigerant connecting pipe 4 and the heat exchange inner cavity 11, and is affected by the exhaust pressure, so that the external refrigerant liquid storage device 3 of the present structure can be completely filled with liquid, 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, the evaporation oil return holes 5 are further refined and are evenly distributed on the extension tube portion 41 from top to bottom, so that the evaporation oil return holes 5 are formed into multi-stage oil return holes that can be used for oil return when the frequency is low or the refrigerant is less.

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

[0035] The specific shape and connection method of the refrigerant connecting pipe 4 are shown in the figure. During operation, refrigerant enters the external refrigerant reservoir 3 through the refrigerant inlet pipe 10. Then, due to the air pressure within the refrigerant reservoir, the refrigerant flows along the refrigerant connecting pipe 4 into the heat exchange chamber 11. Simultaneously, medium enters the heat exchange tube 2 through the medium inlet pipe 8, exchanging heat with the refrigerant in the heat exchange chamber 11, causing the refrigerant to release heat during evaporation and condensation. At this point, the medium is heated by fully utilizing the refrigerant's sensible and latent heat. The heated medium is then discharged through the medium outlet pipe 9. During this time, the vaporized refrigerant can be discharged from the refrigerant outlet pipe 7 to the compressor. Furthermore, because the refrigerant connecting pipe 4 is equipped with multiple oil return holes, in the event of low frequency or insufficient refrigerant supply, the refrigerant flows back to the heat exchange chamber 11 through these multiple oil return holes, thereby replenishing the compressor and ensuring normal operation.

[0036] It is worth noting that the number of the evaporation oil return holes 5 is one, two or more than three, and the heat exchange inner cavity 11 is wound with at least one heat exchange tube 2. The attached figure of this structure shows the assembly status, that is, the heat exchange inner cavity 11 is wound with two heat exchange tubes 2 wound in parallel, thereby improving the heat exchange efficiency.

[0037] The above specific embodiments are only specific implementation methods with better effects of the present invention. Any structure that is the same or equivalent to the external liquid storage heat exchanger of the present invention is within the protection scope of the present invention.

Claims

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

2. The external liquid storage heat exchanger according to claim 1, characterized in that: The heat exchange shell (1) is provided with a heat insulation layer (6), and the heat insulation layer (6) is fixedly connected between the heat exchange shell (1) and the external refrigerant liquid storage container (3).

3. The external liquid storage heat exchanger according to claim 1, characterized in that: The heat exchange shell (1) is provided with a central assembly cavity (12) adapted for installation of an external refrigerant liquid reservoir (3); the refrigerant liquid input pipe (10) is installed on the external refrigerant liquid reservoir (3) and passes through the upper portion of the external refrigerant liquid reservoir (3).

4. The external liquid storage heat exchanger according to claim 1, characterized in that: The liquid inlet of the refrigerant input liquid pipe (10) is located above the refrigerant connecting pipe (4), and the top end of the extension pipe portion (41) of the refrigerant connecting pipe (4) is located below the external refrigerant liquid reservoir (3).

5. The external liquid storage heat exchanger according to claim 1, characterized in that: The evaporation oil return holes (5) are evenly distributed on the extension pipe portion (41) from top to bottom, so that the evaporation oil return holes (5) are formed into multi-stage oil return holes for oil return when the frequency is low or the refrigerant is less.

6. The external liquid storage heat exchanger according to claim 1, characterized in that: The heat exchange tube (2) is wound from top to bottom in the heat exchange inner cavity (11) so that the heat exchange tube (2) forms a sensible heat exchange tube section (21) and a subcooling heat exchange tube section (22) with equal pitch. The connection port of the refrigerant connecting tube (4) is located below the subcooling heat exchange tube section (22) and is connected to the heat exchange inner cavity (11). The evaporation oil return hole (5) and the connection ports of the subcooling heat exchange tube section (22) and the refrigerant connecting tube (4) are correspondingly distributed on the extension tube portion (41).

7. The external liquid storage heat exchanger according to claim 1, characterized in that: 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 medium inlet pipe (8) and the medium outlet pipe (9) of the heat exchange shell (1) and are connected to the liquid inlet and the 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 storage heat exchanger according to claim 1, characterized in that: At least one heat exchange tube (2) is wound around the heat exchange inner cavity (11).

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