CN117588972A - Shell-and-tube heat exchanger - Google Patents

Abstract

The application relates to a shell-and-tube heat exchanger, wherein, including the casing, fixed subassembly, a plurality of heat transfer unit, and be located the first pipe case of casing both sides respectively, the second pipe case, fixed subassembly is located inside the casing and periphery fixed connection in shells inner wall, a plurality of heat transfer unit is located inside the casing and runs through fixed subassembly, heat transfer unit includes heat exchange tube and the sleeve pipe of coaxial setting, the sleeve pipe cover is located the heat exchange tube periphery, the inside first liquid that flows of heat exchange tube, the clearance between heat exchange tube and the sleeve pipe and the clearance between the sleeve pipe flow second liquid, in order to realize the heat exchange of first liquid and second liquid. The heat exchange unit in this application is including coaxial heat exchange tube and the sleeve pipe that sets up, and has the clearance between heat exchange tube and the sleeve pipe, and the second liquid can flow in the clearance between heat exchange tube and sleeve pipe and the clearance between the sleeve pipe simultaneously, has improved heat transfer efficiency, can realize good heat transfer effect.

Description

Shell-and-tube heat exchanger

Technical Field

The invention relates to the field of heat exchangers, in particular to a shell-and-tube heat exchanger.

Background

The heat exchanger is an energy-saving device for realizing heat transfer between two or more fluids with different temperatures, and is one of main devices for transferring heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the temperature of the fluid reaches the index specified by a flow, thereby meeting the requirements of process conditions and improving the utilization rate of energy. The heat exchanger industry relates to more than 30 industries such as heating ventilation, pressure vessels, reclaimed water treatment equipment, chemical industry, petroleum and the like, and has wide application.

Currently, plate heat exchangers are relatively common heat exchangers. The plate heat exchanger is formed by overlapping a series of heat transfer plates which are parallel to each other in a certain order, namely flow passages among the plates, cold fluid and hot fluid flow in the flow passages at two sides of the plates respectively, but the prior plate heat exchanger has the following problems: the gaps between the heat transfer surfaces are smaller, so that the pressure loss is larger; the channels between the plates are narrow, which is easy to cause the blockage of the heat exchange tube; in addition, all heat exchange plates need to be removed during maintenance, and the problem of inconvenient removal during maintenance exists.

Therefore, there is a need for a heat exchanger that has high heat transfer efficiency and is convenient to disassemble when maintenance is required, so as to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims at providing a heat transfer efficiency is high and dismantle easy maintenance's shell-and-tube heat exchanger.

The embodiment of the application can be realized through the following technical scheme:

the shell-and-tube heat exchanger comprises a shell, a fixing assembly positioned in the shell, a first tube box and a second tube box positioned on two sides of the shell respectively, wherein the fixing assembly is fixedly connected to the inner wall of the shell, a first liquid inlet tube is arranged at one end of the first tube box, a first liquid outlet tube is arranged at one end of the second tube box, and first liquid enters the first tube box from the first liquid inlet tube, enters the second tube box through a heat exchange unit and finally flows out from the first liquid outlet tube; a second liquid outlet pipe is arranged below the shell and close to the first pipe box end, a second liquid inlet pipe is arranged close to the second pipe box end, and second liquid enters from the second liquid inlet pipe, flows through the cavity of the shell and flows out from the second liquid outlet pipe.

Further, the shell-and-tube heat exchanger further comprises a plurality of heat exchange units which are located inside the shell and penetrate through the fixing assembly, the heat exchange units comprise heat exchange tubes and sleeves which are coaxially arranged, the sleeves are sleeved on the periphery of the heat exchange tubes, first liquid flows inside the heat exchange tubes, and second liquid flows in gaps between the heat exchange tubes and the sleeves and between the sleeves, so that heat exchange between the first liquid and the second liquid is achieved.

Further, the heat exchange tube comprises a heat exchange tube main body and a plurality of first protrusions, the heat exchange tube main body is of a hollow tubular structure, the outer wall of the heat exchange tube main body is uniformly provided with the plurality of first protrusions along the circumferential direction, the first protrusions extend along the axial direction of the heat exchange tube, and first liquid flows in the heat exchange tube main body.

Further, the heat exchange tube further comprises a plurality of second protrusions, the inner wall of the heat exchange tube main body is uniformly provided with the plurality of second protrusions along the circumferential direction, and the second protrusions extend along the axial direction of the heat exchange tube.

Preferably, the heat exchange tube is made of an aluminum alloy material.

Further, the fixing component comprises a plurality of tube plates which are parallel to each other, a plurality of holes which are uniformly distributed are formed in the tube plates, the inner diameter of each hole is the same as the outer diameter of the sleeve, and the fixing component is used for fixing the heat exchange unit in the shell.

Further, the shell is detachably connected with the first pipe box and the second pipe box through a first flange part and a second flange part;

further, the shell-and-tube heat exchanger further comprises a first flange part, a first sealing structure and a second sealing structure, wherein the two axial ends of the heat exchange tube are detachably connected with the first flange part through the first sealing structure and the second sealing structure respectively;

further, the first flange part comprises a first flange plate positioned on the end of the shell close to the first liquid inlet pipe and a second flange plate positioned on the other end of the shell, and a plurality of holes are formed in the first flange plate and the second flange plate.

Further, the first sealing structure is hollow and tubular and acts on between the first flange plate and the heat exchange tube, and a third protrusion is arranged at the end part of the heat exchange tube, which is close to the first sealing structure.

Further, the third protrusion is inserted into the first sealing structure, the periphery of the third protrusion is detachably connected with the inner wall of the first sealing structure in a matched mode, the first sealing structure is inserted into the hole of the first flange, and the periphery of the first sealing structure is in interference connection with the inner wall of the hole of the first flange.

Further, the second sealing structure acts on between the second ring flange with the heat exchange tube, the second sealing structure inserts realize spacing effect among the hole of second ring flange, the heat exchange tube is close to the inner wall of first liquid outlet pipe end is smooth and the cover is located in predetermineeing length the second sealing structure is close to the heat exchange pipe end, its smooth inner wall with second sealing structure periphery contact realizes interference connection, through with the second sealing structure realizes the heat exchange tube can dismantle with the second ring flange is connected.

The embodiment of the application provides a shell-and-tube heat exchanger which has the following beneficial effects:

1. the heat exchange unit comprises the heat exchange tube and the sleeve which are coaxially arranged, a gap exists between the heat exchange tube and the sleeve, and the second liquid can flow in the gap between the heat exchange tube and the sleeve and the gap between the sleeve at the same time, so that the heat transfer efficiency is improved, and a good heat exchange effect can be realized;

2. the periphery of the heat exchange tube is provided with the first bulge, and the second liquid can be simultaneously contacted with the side wall of the first bulge and the outer wall of the heat exchange tube main body, so that the contact area between the second liquid and the heat exchange tube is increased, and the heat exchange efficiency is improved;

3. the heat exchange tube is characterized in that the inner periphery of the heat exchange tube is provided with the second bulge, the first liquid can be simultaneously contacted with the side wall of the second bulge and the inner wall of the heat exchange tube main body, so that the contact area of the first liquid and the heat exchange tube is further increased, the heat exchange efficiency is further improved, and the cross section area of the second bulge is reduced compared with the cross section area of the straight tube of the light wall, and under the condition of the same flow, the cross section area is inversely proportional to the flow velocity, so that the flow velocity of the first liquid is increased, and the heat exchange efficiency is further increased;

4. the second bulge comprises a sixth bulge and a seventh bulge, the radial length of the sixth bulge is larger than that of the seventh bulge, and the arrangement mode enables the flow velocity of water close to the axis of the heat exchange tube to be further reduced, so that more heat is transferred to the second liquid through the tube wall of the heat exchange tube;

5. the heat exchange tube is made of the aluminum alloy material, can be integrally formed by adopting a cold drawing processing mode, is low in cost, soft in texture and free to cut, and meanwhile, the heat conductivity coefficient of the aluminum alloy is far greater than that of stainless steel, and the heat exchange effect can be enhanced while the cost is saved by adopting the aluminum alloy material;

6. according to the heat exchange tube and the heat exchange tube connecting structure, the first sealing structure and the second sealing structure are arranged, the heat exchange tube is connected with the first flange part, the waterproof performance and the sealing effect are good, meanwhile, when maintenance is needed, the heat exchange tube which needs to be maintained can be independently dismantled, all the heat exchange tubes are not required to be completely dismantled, and the heat exchange tube connecting structure has the advantages of simplicity in disassembly and convenience in maintenance;

7. the position of the first liquid inlet pipe and the first liquid outlet pipe in the first pipe box and the second pipe box can be changed according to actual conditions, so that the installation position is more flexible, and the first liquid inlet pipe and the first liquid outlet pipe are conveniently connected with other equipment through the flange plate.

Drawings

FIG. 1 is a cross-sectional view of a shell and tube heat exchanger of the present application;

FIG. 2 is an overall block diagram of a shell and tube heat exchanger of the present application;

FIG. 3 is an exploded view of a shell and tube heat exchanger of the present application;

FIG. 4 is a cross-sectional view of the heat exchange tube and sleeve of the present application in a radial direction thereof;

FIG. 5 is a cross-sectional view of the heat exchange tube of the present application along its radial direction;

FIG. 6 is a side view of a tube sheet of the present application;

FIG. 7 is an exploded view of the heat exchange unit, first seal structure and second seal structure of the present application;

FIG. 8 is an enlarged view of a portion of area A of FIG. 7;

FIG. 9 is a cross-sectional view of the heat exchange tube of the present application along the axial direction of the heat exchange tube after the heat exchange tube is connected to the first sealing structure and the flange;

FIG. 10 is an enlarged view of a portion of area B of FIG. 7;

FIG. 11 is a cross-sectional view of the flange, heat exchange tube and second seal structure of the present application, taken along the axial direction of the heat exchange tube after the flange is connected;

FIG. 12 is an overall construction view of a shell-and-tube heat exchanger of the present application with a first liquid inlet tube and a first liquid outlet tube disposed in a second direction;

FIG. 13 is an overall construction view of a shell-and-tube heat exchanger in which a first liquid inlet tube and a first liquid outlet tube are disposed in a third direction;

FIG. 14 is an overall construction view of a shell-and-tube heat exchanger in which a first liquid inlet tube and a first liquid outlet tube are disposed in a fourth direction;

the reference numerals in the figures are: 1-shell, 11-second liquid outlet tube, 12-second liquid inlet tube, 13-first flange portion, 131-first flange, 132-second flange, 14-platen, 2-first tube box, 21-first liquid inlet tube, 22-second flange portion, 221-third flange, 222-fourth flange, 3-second tube box, 31-first liquid outlet tube, 4-heat exchange unit, 41-heat exchange tube, 411-heat exchange tube main body, 412-first protrusion, 413-second protrusion, 4131-sixth protrusion, 4131-seventh protrusion, 414-third protrusion, 42-sleeve, 5-securing assembly, 51-tube sheet, 6-first sealing structure, 61-first sealing sleeve, 611-third groove, 612-fifth protrusion, 62-gasket, 7-second sealing structure, 71-second sealing sleeve, 711-left sealing sleeve, 712-right sealing sleeve, 7111-first groove, 7121-fourth protrusion, 7122-second groove, 7123-fourth groove, 72-clip.

Detailed Description

The present application will be further described below based on preferred embodiments with reference to the accompanying drawings.

In addition, various components on the drawings have been enlarged (thick) or reduced (thin) for ease of understanding, but this is not intended to limit the scope of the present application.

The singular forms also include the plural and vice versa.

In the description of the embodiments of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship that a product of the embodiments of the present application conventionally puts in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, in the description of the present application, the terms first, second, etc. are used herein for distinguishing between different elements, but not necessarily for describing a sequential or chronological order of manufacture, and may not be construed to indicate or imply a relative importance, and their names may be different in the detailed description of the present application and the claims.

The terminology used in this description is for the purpose of describing the embodiments of the present application and is not intended to be limiting of the present application. It should also be noted that unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be connected mechanically, directly or indirectly through an intermediate medium, and can be communicated internally. The specific meaning of the terms in this application will be specifically understood by those skilled in the art.

The application provides a shell-and-tube heat exchanger, and fig. 1 and 2 show the cross section and the whole structure diagram of the shell-and-tube heat exchanger in this application respectively, and as shown in fig. 1 and 2, this heat exchanger includes casing 1, fixed subassembly 5, a plurality of heat transfer unit 4 and is located the first pipe case 2, the second pipe case 3 of casing 1 axial both sides, fixed subassembly 5 circumference with casing 1 inner wall fixed connection, heat transfer unit 4 runs through along the axial direction of casing 1 and passes through fixed subassembly 5 and install inside the casing 1.

As shown in fig. 3, the first tube box 2 is provided with a first liquid inlet tube 21, the second tube box 3 is provided with a first liquid outlet tube 31, and the first liquid enters the first tube box 2 from the first liquid inlet tube 21, enters the second tube box 3 through the heat exchange unit 4, and finally flows out from the first liquid outlet tube 31; a second liquid outlet pipe 11 is arranged at one end, close to the first pipe box 2, below the shell 1, a second liquid inlet pipe 12 is arranged at one end, close to the second pipe box 3, of the shell 1, second liquid enters from the second liquid inlet pipe 12, flows through the shell 1 from a gap of the heat exchange unit 4, and then flows out from the second liquid outlet pipe 11.

The first liquid flows in the heat exchange units 4, the second liquid flows in gaps among the heat exchange units 4, the first liquid and the second liquid are two fluids with different temperatures, and due to the existence of the temperature difference, the first liquid and the second liquid exchange heat through the pipe walls of the heat exchange units 4.

In some preferred embodiments of the present application, the housing 1 is cylindrical.

In some preferred embodiments of the present application, the first liquid and the second liquid are water.

As shown in fig. 4 and 7, the heat exchange unit 4 includes a heat exchange tube 41 and a sleeve 42 coaxially disposed, the sleeve 42 is sleeved on the outer periphery of the heat exchange tube 41, the inner diameter of the sleeve 42 is larger than the maximum outer diameter of the heat exchange tube 41, a first liquid flows in the heat exchange tube 41, and a second liquid flows in a gap between the heat exchange tube 41 and the sleeve 42 and a gap between the sleeve 42, so as to realize heat exchange between the first liquid and the second liquid.

Specifically, as shown in fig. 5, the heat exchange tube 41 is in a hollow tubular structure, and includes a heat exchange tube main body 411 and a plurality of first protrusions 412, the outer wall of the heat exchange tube main body 411 is uniformly provided with a plurality of first protrusions 412 protruding outwards along the circumferential direction thereof, the first protrusions 412 extend along the axial direction of the heat exchange tube main body 411, and due to the arrangement of the first protrusions 412, the second liquid can simultaneously contact with the side wall of the first protrusions 412 and the outer wall of the heat exchange tube main body 411, so that the contact area of the second liquid with the heat exchange tube 41 is increased, and the heat exchange efficiency is improved.

Further, the inner wall of the heat exchange tube main body 411 is uniformly provided with a plurality of second protrusions 413 protruding inwards along the circumferential direction thereof, the second protrusions 413 extend along the axial direction of the heat exchange tube main body 411, and the first liquid can contact with the side wall of the second protrusions 413 and the inner wall of the heat exchange tube main body 411 at the same time, so that the contact area between the first liquid and the heat exchange tube 41 is further increased, and the heat exchange efficiency is further improved. The first liquid flows inside the heat exchange tube 41 and contacts the second protrusion 413. Meanwhile, due to the arrangement of the second protrusion 413, the cross-sectional area of the second protrusion is reduced compared with that of the straight tube of the optical wall, and under the condition of the same flow rate, the cross-sectional area is inversely proportional to the flow rate, so that the flow rate of the first liquid is increased, and the heat exchange efficiency is further increased.

Further, as shown in fig. 4 and 5, the plurality of second protrusions 413 include at least one sixth protrusion 4131 and a plurality of seventh protrusions 4132, and the radial length of the sixth protrusion 4131 is greater than the radial length of the seventh protrusion 4132.

In some preferred embodiments of the present application, the sixth protrusions 4131 are uniformly and symmetrically disposed and each adjacent extension line radially inward thereof has an included angle of 90 °, and the number of the sixth protrusions is 4. By the arrangement of the sixth protrusion 4131, the flow velocity of the water flowing near the center of the heat exchange tube 41 is reduced, so that more heat can be transferred to the second liquid through the wall of the heat exchange tube 41, and the heat transfer effect is enhanced.

In some preferred embodiments of the present application, the first protrusion 412 and the second protrusion 413 are inverted V-shaped or inverted U-shaped.

In some preferred embodiments of the present application, the heat exchange tube 41 is made of an aluminum alloy material, which has a higher thermal conductivity than stainless steel. Meanwhile, compared with a plate heat exchanger, the defect of insufficient contact area is overcome by the higher heat conductivity coefficient, but under the condition that the caliber and the length of the tube body are the same, the heat exchange contact area of the heat exchange tube 41 is larger than that of a straight tube with a light wall by arranging the first bulge 412 and the second bulge 413, so that better heat exchange is realized, and the heat exchange efficiency is improved. Moreover, the aluminum alloy has the advantages of soft texture, easy maintenance and convenient processing.

Further, the heat exchange tube 41 is integrally formed by using a special die in a cold drawing processing mode, and the processing mode is used, so that the secondary processing is avoided to generate stress, the processing flow is simplified, the mechanical property of the heat exchange tube 41 is improved, and meanwhile, the surface of the heat exchange tube 41 is treated, so that the surface of the heat exchange tube 41 is converted into a state not easy to oxidize, and the corrosion speed of aluminum alloy is delayed.

In some preferred embodiments of the present application, the sleeve 42 is made of a ferrous material.

Further, as shown in fig. 6, the fixing assembly 5 includes a plurality of tube plates 51 fixedly connected to the inside of the casing 1, while the outer diameter of the tube plates 51 is matched with the inner diameter of the casing 1, and is fixedly connected to the inner wall of the casing 1 by welding, and a plurality of holes are uniformly distributed in the tube plates 51, the inner diameters of the holes are matched with the outer diameter of the sleeve 42, and the sleeve 42 penetrates through the tube plates 51 and is fixedly connected with the tube plates 51. Because the tube plates 51 are placed in parallel, a plurality of cavities with larger volumes are formed between the shell 1 and the tube plates 51, after the second liquid enters the shell 1 from the second liquid inlet pipe 12, a part of the second liquid is positioned in the cavities, the second liquid is filled in the cavities of the shell 1, at the moment, the pressure on two sides of the tube plates 51 is the same, the tube plates 51 can be effectively prevented from being damaged in a high-pressure environment, and meanwhile, due to the blocking effect of the tube plates 51, only a small amount of water flows from a gap at the joint of the tube plates 51, the shell 1 and the sleeve 42. And a part of the liquid is positioned in the gap between the heat exchange tube 41 and the sleeve 42, and the second liquid positioned in the gap has a temperature difference with the first liquid inside the heat exchange tube 41, so that heat transfer can be performed. Meanwhile, the flow rate of the second liquid in the gap between the heat exchange tube 41 and the sleeve 42 is greater than the flow rate of the second liquid in the cavity, so that efficient energy transfer can be further realized.

Further, as shown in fig. 7, the shell-and-tube heat exchanger further comprises a first sealing structure 6, a second sealing structure 7 and a first flange portion 13, wherein the first flange portion 13 is mounted at two ends of the shell 1 in the axial direction, and two axial ends of the heat exchange tube 41 are respectively in sealing and detachable connection with the first flange portion 13 through the first sealing structure 6 and the second sealing structure 7.

Specifically, as shown in fig. 3, the first flange 13 includes a first flange 131 and a second flange 132, and the first flange 131 is adjacent to the first liquid inlet pipe 21, and the second flange 132 is at the other end.

Specifically, as shown in fig. 8 and 9, the first sealing structure 6 is located between the heat exchange tube 41 and the first flange 131, the first sealing structure 6 includes a first sealing sleeve 61, the first sealing sleeve 61 is hollow and rotationally symmetric around an axis thereof, a fifth protrusion 612 is disposed at an end of the first sealing sleeve 61 away from the heat exchange tube 41, and the fifth protrusion 612 is disposed along a circumferential direction of the heat exchange tube 41 and is matched with a groove on the first flange 131, so that it can be ensured that the first sealing sleeve 61 is accurately positioned in the first flange 131 during installation. The outer wall of the first sealing sleeve 61 is provided with a plurality of annular third grooves 611 parallel to each other along the circumferential direction, and the sealing effect is achieved by the interference connection of the elasticity of plastic and the heat exchange tube 41 through the cooperation of the sealing ring, and along with the flow of the first liquid, the pressure increase at the third grooves 611 can further improve the sealing effect.

The first sealing sleeve 61 is provided with threads near the inner wall of the end of the heat exchange tube 41, the heat exchange tube 41 is provided with a third protrusion 414 near the end of the first sealing structure 6, the outer wall of the third protrusion 414 is provided with external threads, the length of the external threads is the same as that of the internal threads of the first sealing sleeve 61, the first sealing sleeve 61 is sleeved at the third protrusion 414, and the inner wall of the first sealing sleeve 61 is in contact with the outer wall of the third protrusion 414 to realize threaded connection.

Specifically, the outer diameter of the third protrusion 414 matches the inner diameter of the heat exchange tube main body 411, and at the same time, the plurality of second protrusions 413 are axially stretched into the third protrusion 414 along the heat exchange tube 41.

Further, as shown in fig. 9, two bolt holes are symmetrically arranged at the end of the first sealing sleeve 61 away from the heat exchange tube main body 411 along the axial direction thereof, and when the heat exchange tube is disassembled and maintained, the first sealing sleeve 61 and the heat exchange tube are axially pulled to the outside of the heat exchanger for maintenance by the cooperation of the bolt holes and the bolts by means of external force.

Further, the first sealing structure 6 further includes a gasket 62, where the gasket 62 has a circular ring shape, and the maximum inner diameter of the gasket is the same as the outer diameter of the third protrusion 414, and is installed at the top end of the third protrusion 414, and then is screwed with the first sealing sleeve 61. By using the washer 62, the surface pressure borne by the third projection 414 can be dispersed, and loosening of the bolt caused by collapse of the third projection 414 can be prevented to some extent.

The first flange 131 is a circular plate with a certain thickness, and the inner diameter of the circular plate is larger than that of the casing 1, so that the inner side of the first flange 131 is abutted against the outer side of the casing 1, as shown in fig. 3, the first flange 131 comprises a plurality of bolt holes which are annularly arranged, uniformly distributed and matched with bolts, and meanwhile, the first flange 131 further comprises a plurality of holes, the arrangement of the holes corresponds to the holes of the tube plate 51 one by one, the shape of the holes of the first flange are matched with the shape of the first sealing structure 6, so that the first sealing structure 6 is installed, and the effect of sealing connection of the heat exchange tube 41 and the first flange 131 is realized.

Further, the end of the heat exchange tube 41 near the first liquid outlet tube 31 is in sealing detachable connection with the second flange 132 through the second sealing structure 7.

Specifically, as shown in fig. 10 and 11, the second sealing structure 7 includes a second sealing sleeve 71 and a clamping band 72, where the second sealing sleeve 71 includes a left sealing sleeve 711 and a right sealing sleeve 712, which are coaxially arranged hollow tubular structures and are integrally formed. The end of the second sealing sleeve 71 close to the heat exchange tube 41 is the left sealing sleeve 711, and the end far away from the heat exchange tube 41 is the right sealing sleeve 712. The inner diameter of the left sealing sleeve 711 is smaller than that of the right sealing sleeve 712, the outer diameter of the left sealing sleeve 711 is the same as that of the heat exchange tube 41, the length of the right sealing sleeve 712 is slightly larger than the thickness of the second flange 132, and the exceeding part cooperates with the clamping hoop 72 to achieve the limiting effect.

The outer wall of the left sealing sleeve 711 is provided with at least one annular first groove 7111 along the circumferential direction, when in connection, the left sealing sleeve 711 fully stretches into the heat exchange tube 41, the outer wall of the left sealing sleeve 711 contacts with the inner wall of the heat exchange tube 41, and is in interference connection with the heat exchange tube 41 by utilizing the elasticity of plastics through the cooperation of the sealing ring. Moreover, at the portion where the left sealing sleeve 711 contacts the inner wall of the heat exchange tube 41, the inner wall of the heat exchange tube 41 is smooth and is not provided with the plurality of second protrusions 413, but the plurality of first protrusions 412 are still stretched to the end along the heat exchange tube 41.

In some preferred embodiments of the present application, as shown in fig. 11, the inner diameter of the heat exchange tube main body 411 near the end of the second sealing structure 7 is greater than the outer diameter of the left sealing sleeve 711 within a preset length of the opening, and at the same time, the left sealing sleeve 711 is chamfered near the end of the heat exchange tube main body 411, so that the second sealing structure 7 can be smoothly inserted into the end of the heat exchange tube main body 411 and is in interference fit with the heat exchange tube main body 411.

Further, a plurality of annular fourth grooves 7123 are formed in the outer wall of the right sealing sleeve 712 along the circumferential direction thereof, the right sealing sleeve 712 extends into the second flange 132, and the sealing sleeve is sleeved on the outer periphery of the fourth grooves 7123, so that interference fit between the right sealing sleeve 712 and the second flange 132 is achieved.

The right sealing sleeve 712 is provided with a fourth protrusion 7121 which is outward along the circumferential direction thereof near the end of the heat exchange tube 41, and the outer diameter of the fourth protrusion 7121 is larger than the outer diameter of the right sealing sleeve 712. Meanwhile, a second groove 7122 is provided at the end of the right sealing sleeve 712 away from the heat exchange tube 41, the second groove 7122 may accommodate the clip 72, and the clip 72 is integrally in a non-closed annular structure. When in installation, the right sealing sleeve 712 enters the hole of the second flange 132, and the clamp 72 matches with the second groove 7122 on the side of the second flange 132 away from the heat exchange tube 41 to achieve a limit effect. The fixing of the heat exchange tube 41 and the second flange 132 can be realized through the limiting of the two structures of the clamp 72 and the fourth protrusion 7121, so that the sealing performance is further improved, and the sealing effect is improved.

The second flange 132 has the same shape, size and structure as the first flange 131, except that the hole inside diameter of the second flange 132 is the same as the outside diameter of the right sealing sleeve 712.

The shell 1 with first pipe case 2 the second pipe case 3 passes through first flange portion 13 with second flange portion 22 can dismantle the connection, second flange portion 22 includes third ring flange 221, fourth ring flange 222, third ring flange 221 is for having certain thickness and the cross section is hollow annular ring, includes a plurality of bolt holes of evenly arranging on the ring, the bolt hole with the bolt hole one-to-one in first flange portion 13, fourth ring flange 222 also.

Further, the first flange portion 13, the second flange portion 22 and the fixing member 5 are disposed in parallel to each other.

The center of the first pipe box 2, which is far away from the end of the shell 1, is fixedly connected with the first liquid inlet pipe 21, and the other end of the first liquid inlet pipe 21 is fixedly connected with a flange plate for being connected with other equipment. The center of the second pipe box 3 far away from the end of the shell 1 is fixedly connected with the first liquid outlet pipe 31, and the other end of the second pipe box is fixedly connected with a flange plate for being connected with other equipment.

In some preferred embodiments of the present application, fig. 12, 13 and 14 show overall structural diagrams of a shell-and-tube heat exchanger in which the first liquid inlet tube 21 and the first liquid outlet tube 31 are arranged in the second direction, the third direction and the fourth direction, respectively. As shown in fig. 12, 13 and 14, the second direction is a direction below the shell-and-tube heat exchanger and parallel to the second liquid outlet pipe 11, the third direction is a direction on both sides of the shell-and-tube heat exchanger in the axial direction and perpendicular to the second liquid outlet pipe 11, and the fourth direction is a direction above the shell-and-tube heat exchanger and parallel to the second liquid outlet pipe 11. The positions of the first liquid inlet pipe 21 and the first liquid outlet pipe 31 in the first pipe box 2 and the second pipe box 3 can be changed according to specific conditions, so that detachable connection with other devices can be realized conveniently through flanges.

In some preferred embodiments of the present application, as shown in fig. 3, the shell-and-tube heat exchanger further includes a pressure plate 14, where the pressure plate 14 is located between the first flange 131 and the third flange 221, and the three are disposed in parallel. The shape and size of the pressing plate 14 are the same as those of any tube plate 51, and the difference is that the pressing plate 14 further comprises a plurality of bolt holes matched with the bolts, the pressing plate 14 is fixed on the first flange 131 by the bolts, and the heat exchange tube 41 can penetrate through the pressing plate 14 along the axial direction of the shell 1, so that the sealing effect is improved while the heat exchange tube 41 is further fixed.

In some preferred embodiments of the present application, the platen 14 is made of a stainless steel material.

When maintenance and disassembly are needed, firstly, the bolts at the joint of the pressing plate 14 and the first flange plate 131 are screwed, the pressing plate 14 is disassembled, then the bolts are inserted into the bolt holes in the first sealing sleeve 61, the first sealing sleeve 61 and the heat exchange tube are axially pulled to the outside of the heat exchange tube by external force, meanwhile, the heat exchange tube is separated from the second sealing structure 7, the second sealing structure 7 is kept motionless in the second flange plate 132, and then the threaded structure between the first sealing sleeve 61 and the heat exchange tube is screwed, so that the separation of the heat exchange tube and the first sealing sleeve 61 can be realized. The disassembly method of the utility model saves the disassembly step, facilitates maintenance and reduces labor cost.

While the foregoing is directed to embodiments of the present application, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (8)

1. The utility model provides a shell-and-tube heat exchanger, includes casing (1), is located the inside fixed subassembly (5) of casing (1) and is located first pipe case (2), second pipe case (3) of casing (1) both sides respectively, fixed subassembly (5) fixed connection in casing (1) inner wall first pipe case (2) one end sets up first liquid inlet tube (21) second pipe case (3) one end sets up first liquid outlet tube (31), and first liquid is followed first liquid inlet tube (21) get into first pipe case (2) get into second pipe case (3) through heat transfer unit (4) again, follow at last first liquid outlet tube (31) flows out; a second liquid outlet pipe (11) is arranged below the shell (1) and close to the end of the first pipe box (2), a second liquid inlet pipe (12) is arranged close to the end of the second pipe box (3), second liquid enters from the second liquid inlet pipe (12), flows through the cavity of the shell (1) and flows out from the second liquid outlet pipe (11), and the device is characterized in that:

still including being located inside of casing (1) and run through a plurality of heat transfer unit (4) of fixed subassembly (5), heat transfer unit (4) are including coaxial heat exchange tube (41) and sleeve pipe (42) that set up, sleeve pipe (42) cover is located heat exchange tube (41) periphery, the inside first liquid that flows of heat exchange tube (41), heat exchange tube (41) with clearance between sleeve pipe (42) and the clearance between sleeve pipe (42) flows the second liquid to realize the heat exchange of first liquid and second liquid.

2. The shell and tube heat exchanger according to claim 1, wherein:

the heat exchange tube (41) comprises a heat exchange tube main body (411) and a plurality of first protrusions (412), the heat exchange tube main body (411) is of a hollow tubular structure, the outer wall of the heat exchange tube main body (411) is uniformly provided with the plurality of first protrusions (412) along the circumferential direction, the first protrusions (412) extend along the axial direction of the heat exchange tube (41), and first liquid flows in the heat exchange tube main body (411).

3. The shell and tube heat exchanger according to claim 2, wherein:

the heat exchange tube (41) further comprises a plurality of second bulges (413), the second bulges (413) are uniformly arranged on the inner wall of the heat exchange tube main body (411) along the circumferential direction, and the second bulges (413) extend along the axial direction of the heat exchange tube (41).

4. The shell and tube heat exchanger according to claim 1, wherein:

the heat exchange tube (41) is made of an aluminum alloy material.

5. The shell and tube heat exchanger according to claim 1, wherein:

the fixing assembly (5) comprises a plurality of tube plates (51) which are parallel to each other, a plurality of holes which are uniformly distributed are formed in the tube plates (51), the inner diameter of each hole is the same as the outer diameter of the sleeve (42), and the fixing assembly is used for fixing the heat exchange unit (4) in the shell (1).

6. The shell and tube heat exchanger according to claim 1, wherein:

the heat exchange tube further comprises a first flange part (13), a first sealing structure (6) and a second sealing structure (7), wherein the two axial ends of the heat exchange tube (41) are detachably connected with the first flange part (13) through the first sealing structure (6) and the second sealing structure (7) respectively;

the first flange part (13) comprises a first flange plate (131) positioned at the end, close to the first liquid inlet pipe (21), of the shell (1) and a second flange plate (132) positioned at the other end of the shell (1), and a plurality of holes are formed in the first flange plate (131) and the second flange plate (132).

7. The shell and tube heat exchanger as set forth in claim 6, wherein:

the first sealing structure (6) is hollow and tubular and acts between the first flange plate (131) and the heat exchange tube (41), and a third protrusion (414) is arranged at the end part of the heat exchange tube (41) close to the first sealing structure (6);

the third bulge (414) is inserted into the first sealing structure (6), the periphery of the third bulge (414) is matched with the inner wall of the first sealing structure (6) to realize detachable connection, the first sealing structure (6) is inserted into the hole of the first flange plate (131), and the periphery of the first sealing structure (6) is in interference connection with the inner wall of the hole of the first flange plate (131).

8. The shell and tube heat exchanger as set forth in claim 6, wherein:

the second sealing structure (7) acts between the second flange plate (132) and the heat exchange tube (41), and the second sealing structure (7) is inserted into the hole of the second flange plate (132) away from the end of the heat exchange tube (41) to achieve a limiting effect; the inner wall of the heat exchange tube (41) close to the end of the first liquid outlet tube (31) is smooth in a preset length and sleeved on the second sealing structure (7) and close to the end of the heat exchange tube (41), the smooth inner wall of the heat exchange tube is in contact with the periphery of the second sealing structure (7) to realize interference connection, and the heat exchange tube (41) and the second flange plate (132) are detachably connected through the second sealing structure (7).