Vertical variable-pipe-diameter rotary dry-type evaporator

Abstract

The invention discloses a vertical variable-pipe-diameter rotary dry-type evaporator which is used in the refrigeration industry and comprises a vertical heat exchange unit, and the vertical heat exchange unit comprises an inner shaft and a rotary disturbance body which is driven by a motor and rotates around the inner shaft; the rotary disturbance body comprises an outer shaft and a plurality of heat exchange tubes, the outer shaft coaxially sleeves the inner shaft, and the heat exchange tubes are fixedly arranged on the outer side of the outer shaft in parallel at intervals; at least two heat exchange pipes are arranged in the same radius direction of the vertical heat exchange unit, and the pipe diameters of the heat exchange pipes are gradually increased from inside to outside; a refrigerant inlet is formed in the bottom of the inner shaft, and a refrigerant outlet is formed above the inner shaft An opening is formed between the inner shaft and the outer shaft and serves as a flowing opening of a refrigerant; the outer shaft is connected with each heat exchange tube through a liquid distribution tube and a gas collection tube; both the inner shaft and the outer shaft are provided with axial partitions; and gaps are formed between the baffle plates and the inner wall of the shell. The device is small in occupied space, and the heat exchange effect of the heat exchange pipe and chilled water is greatly improved through rotation and winding of the rotary disturbance body.

Description

Technical Field

[0001] The invention relates to the field of refrigeration heat exchangers, and in particular to a vertical variable-diameter rotary dry evaporator. Background Art

[0002] The main feature of the dry evaporator is that the refrigerant flows inside the tube, while the coolant flows outside the tube. This structure allows the refrigerant to fully vaporize inside the tube and absorb the heat of the coolant outside the tube, thereby achieving heat transfer and cooling effect.

[0003] Dry evaporators are widely used in refrigeration systems, chemical systems, metallurgical systems, food processing systems and other fields to achieve processes such as evaporation, concentration and drying of water in the gas or steam phase.

[0004] Dry evaporators have many advantages, such as simple structure, easy operation, and low maintenance cost. At the same time, since no external liquid medium is required, dry evaporators also save water resources and reduce the cost of water treatment. However, dry evaporators also have some limitations, such as relatively low heat exchange efficiency and the need for a larger floor space in some applications.

[0005] Therefore, how to solve the above-mentioned deficiencies in the prior art has become a subject to be studied and solved by the present invention. Summary of the invention

[0006] The purpose of the present invention is to provide a vertical variable-diameter rotary dry evaporator.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A vertical variable-diameter rotary dry evaporator comprises a vertical heat exchange unit, which is arranged in the inner cavity of the evaporator shell; The vertical heat exchange unit is cylindrical, and includes an inner shaft and a rotating disturbance body driven by a motor to rotate around the inner shaft; the inner shaft is vertically arranged and fixed relative to the shell, and the rotating disturbance body includes a vertically arranged outer shaft and a plurality of heat exchange tubes, the outer shaft is coaxially sleeved on the inner shaft, and each of the heat exchange tubes is fixedly arranged on the outer side of the outer shaft in parallel and at intervals; wherein at least two heat exchange tubes are arranged in the same radial direction of the vertical heat exchange unit, and the diameter of each of the heat exchange tubes increases in order from the inside to the outside; The bottom of the inner shaft is provided with a refrigerant inlet, and the top is provided with a refrigerant outlet; an opening is provided between the inner shaft and the outer shaft as a flow port for the refrigerant; The outer shaft is connected to each of the heat exchange tubes via a liquid distributor as a flow channel for the refrigerant; the outer shaft is connected to each of the heat exchange tubes via a gas collecting pipe as a flow channel for the refrigerant vapor, and the gas collecting pipe is arranged at the top of the vertical heat exchange unit; The inner shaft and the outer shaft are both provided with an axial partition, so as to separate their respective shaft bodies into upper and lower parts; the liquid dispensing tube is located below the partition; The shell is provided with a chilled water inlet on the top and a water outlet on the bottom; The rotating disturbance body also includes a plurality of horizontally arranged baffles, each of which is fixed relative to the heat exchange tube and is arranged alternately and parallelly in a vertical direction; each of the baffles has a gap with the inner wall of the shell.

[0008] In the above scheme, the refrigerant can be a commonly used refrigerant such as Freon.

[0009] In the above solution, the shell is fixed relative to the ground through a support frame and is a stationary part.

[0010] In the above scheme, the rotating disturbance body uses the axis of the inner shaft as the rotation axis, and the diameter of the heat exchange tube is inversely proportional to the distance between the heat exchange tube and the rotation axis, that is, the farther the heat exchange tube is from the rotation axis, the larger the diameter of the heat exchange tube is, thereby increasing the heat exchange surface with the chilled water by increasing the tube wall area, thereby compensating for the relatively low heat exchange efficiency of the distal heat exchange tube caused by the relatively small rotation angular velocity.

[0011] In the above scheme, the refrigerant outlet is connected to the compressor through a pipeline, and the refrigerant vapor is sent to the compressor through the refrigerant outlet. At the same time, since the lubricating oil is in the form of particles and has a light weight, it can be brought back to the compressor by the gaseous refrigerant, thereby further achieving a better oil return effect.

[0012] In the above scheme, the purpose of providing axial partitions on both the inner shaft and the outer shaft is to prevent the refrigerant from flowing directly through the inner shaft or the outer shaft to the top refrigerant outlet and then flowing out, thereby reducing the refrigerant flow rate flowing into each heat exchange tube and affecting the heat exchange performance. That is, the partition is provided to avoid refrigerant short circuit.

[0013] In a further technical solution, the number of heat pipes is greater than or equal to three. The number of heat pipes depends on the diameter of the heat pipe, the horizontal spacing between adjacent heat pipes, and the diameter of the rotating disturbance body, and the number of heat pipes is positively correlated with the heat exchange performance. When there are three heat pipes, the diameters of each heat exchange tube are 7mm, 9.52mm, and 16mm from the inside to the outside; when there are five heat pipes, the diameters of each heat exchange tube are 5mm, 7mm, 9.52mm, 16mm, and 25mm from the inside to the outside.

[0014] According to a further technical solution, a plurality of openings are provided and are arranged at intervals along the axial direction of the inner shaft.

[0015] According to a further technical solution, the gas collecting pipe is located above the partition.

[0016] In a further technical solution, the rotating disturbance body further comprises a tube sheet, which is horizontally arranged and fixed relative to the outer shaft, and a plurality of water holes for circulating chilled water are provided on the tube sheet along its thickness direction, and each of the water holes is arranged corresponding to the gap between the heat exchange tubes; The tube sheet is at least arranged above the vertical heat exchange unit, and is used to realize uniform flow of the chilled water entering the vertical heat exchange unit.

[0017] According to a further technical solution, two tube sheets are provided, the first tube sheet is provided above the vertical heat exchange unit, and the second tube sheet is provided below the vertical heat exchange unit, and the second tube sheet can realize uniform flow of the chilled water flowing out of the vertical heat exchange unit.

[0018] According to a further technical solution, the rotation speed of the motor is 300-500 r / min to ensure the rotation disturbance effect and thus ensure efficient heat exchange efficiency.

[0019] In the above solution, the inner shaft is in a tubular shape, the outer shaft is in a sleeve shape, and the tube wall of the outer shaft is hollow.

[0020] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0021] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0022] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0023] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0024] The working principle and advantages of the present invention are as follows: (1) The present invention can significantly reduce the floor space through the vertical design and improve the utilization rate of the site.

[0025] (2) The present invention provides a rotating disturbance body in the vertical heat exchange unit to achieve the effect of enhancing heat exchange through rotating disturbance; (3) The present invention sets the diameter of the heat exchange tube to gradually increase from near to far, thereby increasing the contact area between the tube wall and the chilled water, thereby effectively compensating for the low heat exchange performance of the far-end heat exchange tube caused by the low rotation angular velocity.

[0026] (4) The vertical heat exchange unit of the present invention can ensure the separation of refrigerant liquid and refrigerant vapor, and all refrigerant vapor enters the compressor, thereby effectively avoiding wet compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 It is a structural schematic diagram of a longitudinal section of an embodiment of the present invention; Attached Figure 2 for Figure 1 Schematic diagram of the cross section along the AA direction; Attached Figure 3 1 is a top view of a tube sheet according to an embodiment of the present invention.

[0028] Attached Figure 4 for Figure 1 The enlarged view of point I in the figure; Attached Figure 5 for Figure 1 Enlarged view of point II in the figure.

[0029] In the above figures: 1, vertical heat exchange unit; 2, shell; 3, inner cavity; 4, inner shaft; 5, motor; 6, rotating disturbance body; 7, outer shaft; 8, heat exchange tube; 9, refrigerant inlet; 10, refrigerant outlet; 11, opening; 12, liquid distribution pipe; 13, gas collecting pipe; 14, partition; 15, water inlet; 16, water outlet; 17, baffle; 18, tube sheet; 19, gap; 20, water hole. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Embodiment: The present invention will be clearly described below with diagrams and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0031] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0032] See attached Figure 1 As shown, a vertical variable-diameter rotary dry evaporator includes a vertical heat exchange unit 1 , which is arranged in an inner cavity 3 of an evaporator shell 2 .

[0033] The vertical heat exchange unit 1 is cylindrical, including an inner shaft 4 and a rotating disturbance body 6 driven by a motor 5 to rotate around the inner shaft 4; the inner shaft 4 is vertically arranged and fixed relative to the shell 2, and the rotating disturbance body 6 includes a vertically arranged outer shaft 7 and a plurality of heat exchange tubes 8, the outer shaft 7 is coaxially sleeved on the inner shaft 4, and each of the heat exchange tubes 8 is fixedly arranged on the outside of the outer shaft 7 in parallel and at intervals.

[0034] Among them, Figure 2 As shown, three heat exchange tubes 8 are provided in the same radial direction of the vertical heat exchange unit 1, and the diameters of the heat exchange tubes 8 increase from the inside to the outside, which are 7 mm, 9.52 mm, and 16 mm respectively.

[0035] The bottom of the inner shaft 4 is provided with a refrigerant inlet 9, through which the refrigerant (mainly liquid) from the expansion valve enters the vertical heat exchange unit 1. The top of the inner shaft 4 is provided with a refrigerant outlet 10, which is connected to the compressor through a pipeline, and the refrigerant vapor is sent to the compressor through the refrigerant outlet 10. An opening 11 is provided between the inner shaft 4 and the outer shaft 7 as a flow port for the refrigerant (see Figure 5 ). Preferably, the openings 11 are provided in plurality and are arranged at intervals along the axial direction of the inner shaft 4 .

[0036] The outer shaft 7 and each of the heat exchange tubes 8 are connected via a liquid distributor 12 as a flow channel for the refrigerant; the outer shaft 7 and each of the heat exchange tubes 8 are connected via a gas collecting pipe 13 as a flow channel for the refrigerant vapor, and the gas collecting pipe 13 is disposed at the top of the vertical heat exchange unit 1.

[0037] The inner shaft 4 and the outer shaft 7 are both provided with an axial partition 14 , thereby dividing their respective shaft bodies into two upper and lower parts, and the liquid dispensing tube 12 is located below the partition 14 .

[0038] The housing 2 has a water inlet 15 for chilled water on the top and a water outlet 16 on the bottom.

[0039] The rotating disturbance body 6 also includes a plurality of baffles 17 arranged horizontally, each of which is fixed relative to the heat exchange tube 8 and arranged alternately and parallelly in a vertical direction. Figure 4 As shown, each baffle 17 is provided with a gap 19 with the inner wall of the shell 2 to avoid touching the shell 2 during rotation.

[0040] Preferably, the gas collecting pipe 13 is located above the partition 14 .

[0041] Preferably, Figure 3As shown, the rotating disturbance body 6 also includes a tube sheet 18, which is horizontally arranged and fixed relative to the outer shaft 7, and a plurality of water holes 20 for circulating chilled water are opened on the tube sheet 18 along its thickness direction, and each of the water holes 20 is arranged corresponding to the gap between the heat exchange tubes 8.

[0042] The tube sheets 18 are provided with two, the first tube sheet is provided above the vertical heat exchange unit 1 , and the second tube sheet is provided below the vertical heat exchange unit 1 .

[0043] Preferably, the rotation speed of the motor 5 is 300-500 r / min to ensure the rotation disturbance effect and thus ensure high heat exchange efficiency.

[0044] Now the working principle of the present invention is described as follows: The present invention discloses a vertical variable-diameter rotary dry evaporator, in which the outer shaft 7 is driven to rotate by the motor 5, and the outer shaft 7 drives the heat exchange tube 8 to rotate, thereby enhancing the heat exchange effect by disturbing the chilled water in the inner cavity 3 of the shell 2. The farther the diameter of the heat exchange tube 8 is from the inner shaft 4, the larger the diameter is, which in turn compensates for the problem of low angular velocity of rotation of the far-end heat exchange tube 8. The refrigerant enters the inner shaft 4 from the refrigerant inlet 9 at the bottom, enters the outer shaft 7 through the opening 11, and then is divided into each heat exchange tube 8, and the chilled water runs outside the heat exchange tube 8. The lubricating oil can return to the compressor with the refrigerant vapor, which is convenient for oil return. A plurality of baffles 17 are arranged on the outside of the heat exchange tube 8, so that the chilled water can flow vertically through the tube cluster multiple times when flowing from top to bottom under the action of gravity, thereby increasing the time it stays in the vertical heat exchange unit 1, thereby improving the heat exchange efficiency. When the low-temperature and low-pressure liquid refrigerant contacts the heat exchange tube 8 with a higher temperature, it begins to absorb heat from the chilled water outside the tube and gradually evaporates into a gaseous state. The evaporated refrigerant vapor rises to the top of the vertical heat exchange unit 1 and returns to the compressor.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical variable diameter rotary dry evaporator, characterized in that: It comprises a vertical heat exchange unit (1), which is arranged in an inner cavity (3) of an evaporator shell (2); The vertical heat exchange unit (1) is cylindrical, and comprises an inner shaft (4) and a rotating disturbance body (6) driven by a motor (5) to rotate around the inner shaft (4); the inner shaft (4) is vertically arranged and fixed relative to the shell (2); the rotating disturbance body (6) comprises a vertically arranged outer shaft (7) and a plurality of heat exchange tubes (8); the outer shaft (7) is coaxially sleeved on the inner shaft (4); and each of the heat exchange tubes (8) is fixedly arranged on the outer side of the outer shaft (7) in parallel and at intervals; wherein at least two heat exchange tubes (8) are arranged in the same radial direction of the vertical heat exchange unit (1), and the diameter of each of the heat exchange tubes (8) increases in order from the inside to the outside; The bottom of the inner shaft (4) is provided with a refrigerant inlet (9), and the top is provided with a refrigerant outlet (10); an opening (11) is provided between the inner shaft (4) and the outer shaft (7) as a refrigerant flow port; The outer shaft (7) and each of the heat exchange tubes (8) are connected via a liquid distributor (12) as a flow channel for the refrigerant; the outer shaft (7) and each of the heat exchange tubes (8) are connected via a gas collecting pipe (13) as a flow channel for the refrigerant vapor, and the gas collecting pipe (13) is arranged at the top of the vertical heat exchange unit (1); The inner shaft (4) and the outer shaft (7) are both provided with an axial partition (14), thereby dividing their respective shaft bodies into upper and lower parts; the liquid dispensing tube (12) is located below the partition (14); The housing (2) is provided with a chilled water inlet (15) on the top and a water outlet (16) on the bottom; The rotating disturbance body (6) further comprises a plurality of horizontally arranged baffles (17), each of the baffles (17) being fixed relative to the heat exchange tube (8) and being arranged alternately and parallelly in a vertical direction and spaced apart from each other; each of the baffles (17) being provided with a gap (19) with the inner wall of the shell (2).

2. A vertical variable diameter rotary dry evaporator according to claim 1, characterized in that: The number of the heat pipes is greater than or equal to three.

3. A vertical variable diameter rotary dry evaporator according to claim 2, characterized in that: A plurality of openings (11) are provided and are arranged at intervals along the axial direction of the inner shaft (4).

4. A vertical variable diameter rotary dry evaporator according to claim 1, characterized in that: The gas collecting pipe (13) is located above the partition (14).

5. The vertical variable diameter rotary dry evaporator according to claim 1, characterized in that: The rotating disturbance body (6) further comprises a tube sheet (18), the tube sheet (18) being arranged horizontally and fixed relative to the outer shaft (7), and a plurality of water holes (20) for circulating chilled water are provided on the tube sheet (18) along its thickness direction, and each of the water holes (20) is arranged corresponding to the gap between the heat exchange tubes (8); The tube sheet (18) is at least arranged above the vertical heat exchange unit (1).

6. A vertical variable diameter rotary dry evaporator according to claim 5, characterized in that: The tube sheets (18) are provided with two, the first tube sheet is provided above the vertical heat exchange unit (1), and the second tube sheet is provided below the vertical heat exchange unit (1).

7. A vertical variable diameter rotary dry evaporator according to claim 1, characterized in that: The rotation speed of the motor (5) is 300-500 r / min.

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