Evaporator suitable for cooling-water machine

Abstract

The evaporator suitable for the water chiller comprises a first shell and a second shell, the first shell is suitable for forming a refrigeration cavity in an enclosing mode, and the inner side and the outer side of at least part of the first shell are suitable for forming an inner heat exchange face and an outer heat exchange face respectively. The second shell is suitable for being matched with the inner heat exchange face or the outer heat exchange face in a butt joint mode to define an evaporation flow channel, and at least one of the first shell and the second shell is provided with a flow groove suitable for guiding refrigerants to flow. The first shell and the second shell are in butt joint and matched to form the evaporation flow channel for flowing evaporation of refrigerants, water storage space is not occupied, the heat exchange area is large, the first shell directly participates in forming the evaporation flow channel, the heat exchange efficiency is high, the structure is compact, the material cost is reduced, heat exchange efficiency reduction caused by multiple layers of heat-conducting media is avoided, and the service life of the heat exchanger is prolonged. The cold cavity is simple in structure, and water scale is more convenient to clean.

Description

Technical Field

[0001] The utility model belongs to the technical field of water chillers, and in particular relates to an evaporator suitable for water chillers. Background Art

[0002] A chiller is a device used for cooling that transfers heat from one place to another through a refrigeration cycle process, thereby lowering the temperature of a specific area or equipment. It can be used in scenes such as ice bath machines and aquariums. The existing Chinese patent with application number CN202220168340.5 discloses an evaporator assembly of a chiller, including a water tank, which is provided with a water inlet and a water outlet, and a large spiral tube and a small spiral tube are placed in the water tank, and the small spiral tube is placed in the hollow of the large spiral tube, and the bottom of the large spiral tube and the small spiral tube are connected by a pipe, the upper end of the large spiral tube is connected to the water inlet pipe, and the upper end of the small spiral tube is connected to the water outlet pipe, and a bracket is provided on the upper end surface of the water tank, and the ends of the water inlet pipe and the water outlet pipe extend from the bracket respectively, and a positioning bracket is installed at the bottom of the water tank, the positioning bracket includes a support plate and an arc-shaped plug rod, the plug rod is vertically arranged on the support plate, the bottom surfaces of the large spiral tube and the small spiral tube are respectively placed on the end surfaces of the support plate, and the plug rods are symmetrically arranged, and the plug rods are inserted in the gap between the large spiral tube and the small spiral tube. In the prior art such as the above-mentioned scheme: the large spiral tube and the small spiral tube are arranged in the water tank as the flow channel for the flow of refrigerant and the medium for realizing the heat exchange between water and refrigerant. The gaps or angles of the stainless steel coil itself and the gaps between the stainless steel coil and the inner tank are prone to scale deposition, which reduces the heat exchange efficiency and is not easy to clean. If the flow channel size is increased in order to ensure the heat exchange area, a certain water storage space will be occupied, and the material cost will increase. Otherwise, there will be problems of small heat exchange area and low heat exchange efficiency. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide an evaporator suitable for a chiller to meet the needs of users.

[0004] To achieve the above object, the utility model provides an evaporator suitable for a chiller, comprising

[0005] A first shell is adapted to enclose and form a refrigeration cavity, and at least a portion of the first shell has inner and outer sides adapted to form an inner heat exchange surface and an outer heat exchange surface, respectively.

[0006] The second shell is adapted to be docked with the inner heat exchange surface or the outer heat exchange surface to enclose an evaporation flow channel, and at least one of the first shell and the second shell has a flow groove adapted to guide the flow of the refrigerant.

[0007] Preferably, the refrigeration cavity is a columnar structure, the cross-section of the refrigeration cavity is circular, elliptical or runway-shaped, the columnar structure includes annular circumferential walls suitable for respectively constituting the inner heat exchange surface and the outer heat exchange surface, the structure is compact, the heat exchange area is uniformly increased, and the temperature difference of the drinkable water in the water storage cavity is reduced; the evaporation flow channel is a spiral structure, which can provide a continuous flow path, facilitate uniform evaporation of the refrigerant, and achieve a more uniform cooling effect.

[0008] Preferably: the flow groove includes an inner flow groove that bulges radially inward along the refrigeration cavity and / or an outer flow groove that bulges radially outward along the refrigeration cavity, and the evaporation flow channel includes an inner evaporation flow channel having the inner flow groove and / or an outer evaporation flow channel having the outer flow groove, wherein: the cross-section of the inner evaporation flow channel is semicircular, and the cross-section of the outer evaporation flow channel is semicircular. This structure enables the refrigerant to fully contact with the first shell, thereby improving the heat exchange efficiency. At the same time, the structure is smooth and stable, with good pressure-bearing capacity, which can alleviate the stress concentration problem and is more suitable for high-pressure environments caused by refrigerant evaporation.

[0009] As a preferred embodiment, the inner evaporation flow channel and the outer evaporation flow channel are not connected, and at least one of the inner evaporation flow channel and the outer evaporation flow channel can allow the refrigerant to flow at the same time.

[0010] Preferably: the annular circumferential wall is a smooth curved surface, the second shell includes the outer flow groove, and the second shell and the outer heat exchange surface are combined to form the outer evaporation flow channel; or, the annular circumferential wall includes the outer flow groove, the second shell is a smooth curved surface, and the second shell and the inner heat exchange surface are combined to form the outer evaporation flow channel.

[0011] Preferably: the annular circumferential wall is a smooth curved surface, the second shell includes the inner flow groove, and the second shell and the inner heat exchange surface are combined to form the inner evaporation flow channel; or, the annular circumferential wall includes the inner flow groove, the second shell is a smooth curved surface, and the second shell and the outer heat exchange surface are combined to form the inner evaporation flow channel.

[0012] Preferably, the second shell includes the flow groove, the center of the annular circumferential wall coincides with the center of the second shell, the axial dimension of the annular circumferential wall is defined as the first height, the axial dimension of the second shell is defined as the second height, and the ratio of the second height to the first height is in the range of 0.5 to 0.8.

[0013] Preferably: the minimum circulation unit of the flow groove is a spiral flow groove, the width of the spiral flow groove is defined as the groove width, the distance between two adjacent spiral flow grooves is defined as the pitch, and the ratio between the groove width and the pitch ranges from 1 to 5; the second shell includes fixed areas arranged at both axial ends of the flow groove, the axial dimension of the fixed area is defined as a fixed height, and the ratio of the fixed height to the groove width is 1.5 to 3.

[0014] Preferably, the first shell and / or the second shell is made of one of copper, aluminum, aluminum alloy or stainless steel, the first shell and the second shell are connected by welding, the area between two adjacent spiral flow grooves is in close contact with the first shell and a welding point is optionally provided, this design can increase the connection strength between the first shell and the second shell, and avoid overflow of refrigerant between adjacent flow channels.

[0015] As a preferred embodiment: it also includes a water inlet pipe and a water outlet pipe suitable for connecting to the refrigeration cavity, a liquid inlet pipe and an air return pipe suitable for connecting to the evaporation flow channel, the water inlet pipe and the water outlet pipe are arranged in parallel and the water outlet pipe is below the water inlet pipe, the liquid inlet pipe and the air return pipe are arranged in parallel and the liquid inlet pipe is below the air return pipe, and the liquid inlet pipe and the water outlet pipe are perpendicular to each other.

[0016] As a preferred embodiment, it also includes a heat-insulating shell suitable for wrapping the first shell and the second shell, and the interior of the heat-insulating shell has a plurality of independently closed air holes.

[0017] The beneficial effects of the utility model are:

[0018] By docking the first shell and the second shell to form an evaporation flow channel for the refrigerant to flow and evaporate, no water storage space is occupied and the heat exchange area is large. The first shell directly participates in the formation of the evaporation flow channel, the heat exchange efficiency is high, the structure is compact, the material cost is reduced, and the heat exchange efficiency is reduced due to multiple layers of heat conductive media. The cold cavity structure is simple and it is more convenient to clean scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of an evaporator suitable for a chiller provided in Example 1.

[0020] Figure 2 This is a schematic diagram of an explosion of an evaporator suitable for a chiller provided in Example 1.

[0021] Figure 3 A cross-sectional schematic diagram of an evaporator suitable for a chiller provided in Example 1.

[0022] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0023] Figure 5 A schematic diagram of the structure of an evaporator suitable for a chiller provided in Example 2.

[0024] Figure 6 A cross-sectional schematic diagram of an evaporator suitable for a chiller provided in Example 2.

[0025] In the figure, a first shell 101, a second shell 102, an insulation shell 103, a refrigeration cavity 104, a water inlet pipe 105, a water outlet pipe 106, a liquid inlet pipe 107, an air return pipe 108, an annular peripheral wall 109, an inner flow groove 110, an inner evaporation flow channel 111, a fixed area 112, an outer flow groove 113, and an outer evaporation flow channel 114. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0028] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0029] A chiller generally includes a refrigeration chamber, a refrigerant circulation system, a water circulation system and an electrical automatic control system. The water circulation system includes a water pump and a pipeline. The water pump extracts cold water from the refrigeration chamber in the chiller and transports it to the equipment or space that needs to be cooled through a pipeline. The water absorbs heat and returns to the refrigeration chamber to be cooled again, forming a closed-loop cycle. The refrigerant circulation system includes an evaporator, a compressor and a condenser. The liquid refrigerant absorbs heat in the evaporator and evaporates into a low-temperature and low-pressure gaseous refrigerant, while cooling the water in the refrigeration chamber. The gaseous refrigerant is then sucked in by the compressor and compressed into a high-temperature and high-pressure gaseous refrigerant. These gaseous refrigerants then enter the condenser and release heat to the external environment, thereby condensing into a high-pressure liquid refrigerant. The liquid refrigerant is throttled into a low-temperature and low-pressure liquid or gas-liquid mixture through a throttling device (such as a thermal expansion valve or a capillary tube), enters the evaporator again, absorbs heat and turns back into a gaseous state, completing a cycle. The electrical automatic control system is responsible for monitoring and controlling the operating status of the chiller, including several sensors for real-time monitoring of parameters such as temperature and pressure, and controllers suitable for adjusting the operation of equipment such as compressors and water pumps as needed.

[0030] Example 1

[0031] An evaporator suitable for a chiller, such as Figure 1-4 As shown, it includes a first shell 101 suitable for enclosing a refrigeration cavity 104, a second shell 102 suitable for docking with the first shell 101 to form an evaporation flow channel, a water inlet pipe 105 and a water outlet pipe 106 suitable for connecting the refrigeration cavity 104, and a liquid inlet pipe 107 and a gas return pipe 108 suitable for connecting the evaporation flow channel. The refrigeration cavity 104 is a columnar structure, and the refrigeration cavity 104 includes an annular peripheral wall 109 suitable for forming an inner heat exchange surface and an outer heat exchange surface respectively, and the cross section of the refrigeration cavity 104 is circular. The second shell 102 has a flow groove suitable for guiding the flow of refrigerant, and the second shell 102 is suitable for docking with the inner heat exchange surface to enclose an evaporation flow channel with a spiral structure.

[0032] Specifically, the flow groove is an inner flow groove 110 that bulges inward along the radial direction of the refrigeration cavity 104, and the annular peripheral wall 109 is a smooth curved surface, thereby forming an inner evaporation flow channel 111 with a semicircular cross section. This structure enables the refrigerant to fully contact the first shell 101, thereby improving the heat exchange efficiency. At the same time, the structure is smooth and stable, and the pressure bearing capacity is good, which can alleviate the stress concentration problem and is more suitable for high-pressure environments caused by refrigerant evaporation. The water inlet pipe 105 and the water outlet pipe 106 are arranged in parallel, and the water outlet pipe 106 is below the water inlet pipe 105. The liquid inlet pipe 107 and the return air pipe 108 are arranged in parallel, and the liquid inlet pipe 107 is below the return air pipe 108. The liquid inlet pipe 107 and the water outlet pipe 106 are perpendicular to each other.

[0033] In this embodiment, the center of the annular peripheral wall 109 coincides with the center of the second shell 102, the axial dimension of the annular peripheral wall 109 is defined as the first height, the axial dimension of the second shell 102 is defined as the second height, and the ratio of the second height to the first height is in the range of 0.7. The structure is compact, the heat exchange area is uniformly increased, and the temperature difference of the potable water in the water storage cavity is reduced. The evaporation flow channel can provide a continuous flow path, which is conducive to the uniform evaporation of the refrigerant and achieves a more uniform cooling effect.

[0034] In this embodiment, the minimum circulation unit of the flow channel is a spiral flow channel, the width of the spiral flow channel is defined as the channel width, the distance between two adjacent spiral flow channels is defined as the pitch, the ratio range between the channel width and the pitch is 5, and the spiral flow channels are arranged closely.

[0035] In this embodiment, the first shell 101 and the second shell 102 are made of stainless steel, and the first shell 101 and the second shell 102 are connected by welding. Specifically, the second shell 102 includes a fixing area 112 arranged at both axial ends of the flow slot, and the fixing area 112 is fixed by welding to the annular peripheral wall 109, and the axial dimension of the fixing area 112 is defined as a fixed height, and the ratio of the fixed height to the slot width is 2.

[0036] Example 2

[0037] An evaporator suitable for a chiller, such as Figure 5-6 As shown, compared with Example 1, the difference is that it also includes and is suitable for wrapping the first shell 101 and the second shell 102. The interior of the insulation shell 103 has a plurality of independent closed air holes. Preferably, the insulation shell 103 is made of polystyrene foam. The cross section of the refrigeration cavity 104 is a runway shape, the second shell 102 has a flow groove suitable for guiding the flow of the refrigerant, and the second shell 102 is suitable for docking with the external heat exchange surface to enclose an evaporation flow channel with a spiral structure. Specifically, the flow groove is an outer flow groove 113 that bulges inwardly along the radial direction of the refrigeration cavity 104, and the annular peripheral wall 109 is a smooth curved surface, thereby forming an outer evaporation flow channel 114 with a semicircular cross section.

[0038] In this embodiment, the minimum circulation unit of the flow groove is a spiral flow groove, the width of the spiral flow groove is defined as the groove width, the distance between two adjacent spiral flow grooves is defined as the pitch, the ratio range between the groove width and the pitch is 1, and the area between two adjacent spiral flow grooves is tightly attached to the first shell 101 and is provided with a welding point. This design can increase the connection strength between the first shell 101 and the second shell 102 and avoid overflow of the refrigerant between adjacent flow channels.

[0039] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. An evaporator suitable for a chiller, characterized in that: include A first shell is adapted to enclose and form a refrigeration cavity, and at least a portion of the first shell has inner and outer sides adapted to form an inner heat exchange surface and an outer heat exchange surface, respectively. The second shell is adapted to be docked with the inner heat exchange surface or the outer heat exchange surface to enclose an evaporation flow channel, and at least one of the first shell and the second shell has a flow groove adapted to guide the flow of the refrigerant.

2. The evaporator suitable for a chiller according to claim 1, characterized in that: The refrigeration cavity is a columnar structure, the columnar structure includes an annular peripheral wall suitable for respectively constituting the inner heat exchange surface and the outer heat exchange surface, and the evaporation flow channel is a spiral structure.

3. The evaporator suitable for a chiller according to claim 2, characterized in that: The flow groove includes an inner flow groove that bulges radially inward along the refrigeration cavity and / or an outer flow groove that bulges radially outward along the refrigeration cavity, and the evaporation flow channel includes an inner evaporation flow channel having the inner flow groove and / or an outer evaporation flow channel having the outer flow groove, wherein: the cross-section of the inner evaporation flow channel is semicircular, and the cross-section of the outer evaporation flow channel is semicircular.

4. The evaporator suitable for a chiller according to claim 3, characterized in that: The inner evaporation flow channel is not connected to the outer evaporation flow channel, and at least one of the inner evaporation flow channel and the outer evaporation flow channel can allow the refrigerant to flow at the same time.

5. The evaporator suitable for a chiller according to claim 3, characterized in that: The annular circumferential wall is a smooth curved surface, the second shell includes the outer flow groove, and the second shell and the outer heat exchange surface are combined to form the outer evaporation flow channel; or, the annular circumferential wall includes the outer flow groove, the second shell is a smooth curved surface, and the second shell and the inner heat exchange surface are combined to form the outer evaporation flow channel.

6. The evaporator suitable for a chiller according to claim 3, characterized in that: The annular circumferential wall is a smooth curved surface, the second shell includes the inner flow groove, and the second shell and the inner heat exchange surface are enclosed to form the inner evaporation flow channel; or, the annular circumferential wall includes the inner flow groove, the second shell is a smooth curved surface, and the second shell and the outer heat exchange surface are enclosed to form the inner evaporation flow channel.

7. An evaporator suitable for a chiller according to any one of claims 2 to 6, characterized in that: The second shell includes the flow groove, the center of the annular circumferential wall coincides with the center of the second shell, the axial dimension of the annular circumferential wall is defined as the first height, the axial dimension of the second shell is defined as the second height, and the ratio of the second height to the first height is in the range of 0.5 to 0.

8.

8. The evaporator suitable for a chiller according to claim 7, characterized in that: The minimum circulation unit of the flow groove is a spiral flow groove, the width of the spiral flow groove is defined as the groove width, the distance between two adjacent spiral flow grooves is defined as the pitch, and the ratio between the groove width and the pitch ranges from 1 to 5; the second shell includes fixed areas arranged at both axial ends of the flow groove, the axial dimension of the fixed area is defined as a fixed height, and the ratio of the fixed height to the groove width is 1.5 to 3.

9. The evaporator suitable for a chiller according to claim 8, characterized in that: The material of the first shell and / or the second shell is one of copper, aluminum, aluminum alloy or stainless steel. The first shell and the second shell are connected by welding. The area between two adjacent spiral flow grooves is tightly attached to the first shell and a welding point is optionally provided.

10. The evaporator suitable for a chiller according to claim 9, characterized in that: It also includes a water inlet pipe and a water outlet pipe suitable for connecting to the refrigeration cavity, and a liquid inlet pipe and an air return pipe suitable for connecting to the evaporation flow channel, wherein the water inlet pipe and the water outlet pipe are arranged in parallel and the water outlet pipe is located below the water inlet pipe, the liquid inlet pipe and the air return pipe are arranged in parallel and the liquid inlet pipe is located below the air return pipe, and the liquid inlet pipe and the water outlet pipe are perpendicular to each other; And / or, it also includes a heat-insulating shell suitable for wrapping the first shell and the second shell, and the interior of the heat-insulating shell has a plurality of independently closed air holes.

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