CN214407075U - Shell and tube heat exchanger - Google Patents

Abstract

A shell-and-tube heat exchanger comprises a shell, a tube plate, heat exchange tubes and a baffle plate, wherein the shell is tubular and encloses an inner cavity, the tube plate is arranged at the end part of the shell, at least two groups of heat exchange tubes are arranged in the shell, each group of heat exchange tubes comprises at least one heat exchange tube, the tube plate is provided with through holes correspondingly communicated with the heat exchange tubes, part of the outer peripheral edge of the baffle plate is limited with the inner surface of the shell, the baffle plate is provided with through holes for the heat exchange tubes to penetrate through, the outer peripheral surface of each heat exchange tube is fixedly and hermetically arranged with the inner peripheral surface of the corresponding through hole, the side wall of the shell is provided with a first opening and a second opening, the first opening and the second opening are arranged at two sides of the baffle plate, the heat exchange tubes are horizontally arranged along the radial direction of the shell, the edge part of the baffle plate is provided with a notch, the included angle between the orientation of the notch and the radial vertical direction of the shell is larger than 0 degree, the flow bypass can be reduced and the heat exchange efficiency can be improved.

Description

Shell and tube heat exchanger

Technical Field

The utility model belongs to the technical field of refrigeration air conditioner and specifically relates to a shell and tube heat exchanger is related to.

Background

A shell-and-tube heat exchanger, as shown in fig. 1, 2 and 3, is a heat exchanger composed of a shell 1, a tube plate, a heat exchange tube 3, a baffle plate 4 and the like. Wherein, the shell 1 is connected with the tube plate; the channel in the heat exchange tube 3 and the part communicated with the channel are called tube pass; the channel between the outer surface of the heat exchange tube 3 and the shell 1 and the part communicated with the channel are called shell pass; two ends of the heat exchange tube 3 are fixed on the tube plate, the tube plate is provided with tube side fluid inlets and outlets 8-1 and 8-2, and two ends of the heat exchange tube 3 are respectively connected with the tube side fluid inlet and the fluid outlets 8-1 and 8-2; the baffle plate 4 is arranged in the shell 1 and used for fixing the heat exchange tube 3 and enabling the fluid in the shell pass to repeatedly change the direction to make cross flow or other flows; and one side of the shell 1 is provided with shell side fluid inlets and outlets 5 and 6.

When the shell-and-tube heat exchanger works, one side of the tube side and the shell side is communicated with a refrigerant pipeline of the air conditioning unit to carry refrigerant, and the other side carries a heat exchange medium (the refrigerant can carry out the heat exchange with the refrigerant) by the tube side or the shell side.

The baffles 4 in the shell and tube heat exchanger are various in form, and the commonly used baffles 4 are arch-shaped. The arched baffle plate 4 penetrates through the heat exchange tube 3 and is used for fixing the heat exchange tube 3; one side of the arch baffle plate 4 is provided with a notch 42, the direction of the notch 42 is the same as the direction of the shell side fluid inlet 5 and the fluid outlet 6, so that the shell side fluid repeatedly changes the direction to flow in a cross flow mode or other modes, and the shell side fluid inlet and outlet 5 and 6 are positioned on the upper side or the lower side of the shell 1 and are parallel to the vertical central line.

When the heat exchange tubes 3 of the shell and tube heat exchanger comprise a plurality of flow path systems, it is referred to as a multi-system shell and tube heat exchanger.

A double system shell and tube heat exchanger in which the inner heat exchange tube 3 comprises two systems is taken as an example, see fig. 3. Generally, all systems in a double-system shell and tube heat exchanger are arranged on the same horizontal line at one time; the system No. 1 is arranged from the center line to the left, and the system No. 2 is arranged from the center line to the right.

The tube side fluid inlet and outlet are positioned on the tube plate, the inlet and outlet communicated with the heat exchange tube 3 of the heat exchanger internal system II is a first tube side fluid inlet and outlet 8-1, the inlet and outlet communicated with the heat exchange tube 3 of the heat exchanger internal system II is an inlet and outlet 8-2 of a second tube side fluid, the 8-1 and 8-2 are in bilateral symmetry, and the tube side of the No. 1 and No. 2 systems can operate independently.

The shell side fluid inlet 5 and fluid outlet 6 are located on the upper or lower side of the housing 1 in a direction parallel to the vertical centerline.

At this time, if the heat exchange tube 3 is fixed by the arched baffle plate 4 and the fluid in the shell side repeatedly changes the direction to make cross flow or other forms of flow, for the design of a general heat exchanger, when only part of the system runs in the shell-and-tube heat exchanger, the fluid on the shell side flows through the heat exchange tube 3 and only exchanges heat with the fluid (tube side fluid) in the heat exchange tube 3 of the running system, but no fluid flows in the heat exchange tube 3 (in the tube side) of the non-running system and does not exchange heat with the fluid on the shell side, so that how to prevent flow bypass and improve the heat exchange effect of the multi-system shell-and-tube heat exchanger under the condition of running part of the system is a problem to be solved.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a shell and tube heat exchanger that can reduce flow bypass possibility.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a shell-and-tube heat exchanger comprises a shell, a tube plate, heat exchange tubes and a baffle plate, wherein the shell is tubular and is enclosed into an inner cavity, at least one end of the shell is open, the tube plate is positioned at the end part of the shell, the outer periphery of the tube plate and the opening of the shell are fixedly and hermetically arranged, at least two groups of heat exchange tubes are arranged in the shell, each group of heat exchange tubes comprises at least one heat exchange tube, the heat exchange tubes are arranged along the axial direction of the shell, the tube plate is provided with through holes correspondingly communicated with the heat exchange tubes, the baffle plate is arranged in the shell, part of the outer periphery of the baffle plate and the inner surface of the shell are in limiting arrangement, the baffle plate is provided with through holes for the heat exchange tubes to penetrate through, the outer periphery of each heat exchange tube and the inner periphery of the through hole are fixedly and hermetically arranged, the side wall of the shell is provided with a first opening and a second opening, one of the first opening and the second opening is an inlet, the other one is an outlet, the first opening and the second opening are communicated with the inner cavity of the shell, the first opening and the second opening are positioned on two sides of the baffle plate, the heat exchange tubes are horizontally arranged along the radial direction of the shell, the edge of the baffle plate is provided with a notch, and the included angle between the orientation of the notch and the radial vertical direction of the shell is more than 0 degree.

Preferably, the notch of the baffle plate faces to the radial horizontal direction of the shell.

Preferably, when the first opening is an inlet, the notch of the baffle plate close to the first opening faces away from the first opening; when the second opening is an inlet, the notch of the baffle plate close to the first opening faces away from the second opening.

Preferably, the heat exchanger comprises two heat exchange systems consisting of two groups of heat exchange tubes and two groups of fluid inlets and outlets, wherein the two groups of fluid inlets and outlets are respectively arranged on the left side and the right side of the tube plate along the horizontal direction, and the two groups of heat exchange tubes are correspondingly horizontally arranged along the radial direction of the shell and are respectively positioned on the left side and the right side of the shell.

Preferably, at least part of the heat exchange tubes are of a U-shaped structure, two ends of each heat exchange tube are connected with a fluid inlet and a fluid outlet of the corresponding group of fluid inlets and outlets, the heat exchange tubes of the U-shaped structure are arranged along the vertical direction, so that pipelines on two sides of the U-shaped structure are respectively positioned on the upper side and the lower side of the vertical direction, and the fluid inlets and the fluid outlets are positioned at the same end of the shell-and-tube heat exchanger;

or the heat exchange tube is a straight tube, two ends of the heat exchange tube are connected with the fluid inlet and the fluid outlet of the corresponding group of fluid inlet and outlet, and the fluid inlet and the fluid outlet are respectively positioned at two ends of the shell-tube heat exchanger.

Preferably, each group of heat exchange tubes comprises a plurality of heat exchange tube rows arranged in the vertical direction, each heat exchange tube row comprises a plurality of heat exchange tubes with different sizes, the heat exchange tube with the larger size is positioned at the outer side of the heat exchange tube with the smaller size, the distance between the two ends of the bent part of the heat exchange tube positioned at the outer side is greater than the distance between the two ends of the bent part of the heat exchange tube positioned at the inner side, and the distance between the medium inlet and the medium outlet of the heat exchange tube positioned at the outer side is greater than the distance between the medium inlet and the medium outlet of the heat exchange tube positioned at the inner side.

Preferably, the number of the baffle plates is at least two, the baffle plates are distributed at intervals along the length direction of the shell, gaps of the baffle plates are arranged in a staggered mode, and the gaps of two adjacent baffle plates face opposite directions; when the first opening is an inlet, the direction of the gap of the baffle plate close to the first opening is far away from the first opening; when the second opening is an inlet, the notch of the baffle plate close to the first opening faces away from the second opening.

Preferably, the notches of the baffle plates face to the horizontal position of the radial direction of the shell, the horizontal line and the vertical line on the baffle plates are combined to form a quadrant, the through holes have four areas in total and are respectively distributed in the four areas of the quadrant, and the notches of the baffle plates are arranged at the two-three quadrant and the one-four quadrant in a staggered manner.

Preferably, the first opening and the second opening are both disposed on the left side of the housing, or the first opening and the second opening are both disposed on the right side of the housing, or the first opening and the second opening are disposed on the left side and the right side of the housing, respectively.

Preferably, a plurality of first receiving cavities positioned at the upper part and a plurality of second receiving cavities positioned at the lower part are formed in the tube plate, each first receiving cavity is connected with the medium inlets of all the heat exchange tubes of the corresponding group of heat exchange tubes and is connected with a corresponding fluid inlet, and each second receiving cavity is connected with the medium outlets of all the heat exchange tubes of the corresponding group of heat exchange tubes and is connected with a corresponding fluid outlet; the pipe plate comprises an inner pipe plate located on the inner side, an outer pipe plate located at the middle part and an inlet and outlet flange located on the outer side, an installation cavity is formed in the inner part of the inner pipe plate, the end part of the shell is inserted into the installation cavity and connected with the inner pipe plate, a connecting groove communicated with the heat exchange pipe is formed in the outer pipe plate, the inner pipe plate is sealed and protected by the outer pipe plate, the inlet and outlet flange is connected with the inner pipe plate and the outer pipe plate through bolts, a fluid inlet and a fluid outlet are connected to the inlet and outlet flange, a storage plate is connected between the inlet and outlet flange and the outer pipe plate, and a first storage cavity and a second storage cavity are formed in the storage plate.

The utility model discloses a shell and tube heat exchanger, multiunit heat transfer system is improved level on the radial plane of casing and is arranged, first opening and second opening are located the both sides of baffling board, the limit portion of baffling board has the breach, the orientation of breach is greater than 0 with the radial vertical direction contained angle of casing, make shell side fluid flow through a plurality of heat transfer systems in proper order when the breach along adjacent baffling board flows, so relapse, shell side fluid can carry out the heat transfer to the medium in each heat transfer system ceaselessly, even still can effectively the heat transfer at partial heat transfer system during operation, air conditioning unit's performance has just also been promoted.

Drawings

FIG. 1 is a schematic diagram of a background art overall explosion configuration;

FIG. 2 is a schematic diagram of a prior art overall side view configuration;

FIG. 3 is a cross-sectional view of a baffle of the prior art;

fig. 4 is a schematic front view of the multi-system shell-and-tube heat exchanger of the present invention;

FIG. 5 is a schematic sectional view of the baffle plate according to the present invention;

fig. 6 is a schematic fluid flow diagram of the present invention;

fig. 7 is an exploded view of the multi-system shell-and-tube heat exchanger of the present invention;

fig. 8 is a partially enlarged schematic view of fig. 7.

In the figure: 1. a housing; 2. a tube sheet; 20. an inner tube sheet; 21. a mounting cavity; 22. an outer tube sheet; 221. connecting grooves; 23. an inlet flange and an outlet flange; 24. a storage plate; 241. a first receiving cavity; 242. a second receiving cavity; 25. A seal ring; 3. a heat exchange pipe; 4. a baffle plate; 41. a through hole; 42. a notch; 5. a first opening; 6. a second opening; 7. a fluid inlet; 8. a fluid outlet; 8-1, a first tube side fluid inlet and outlet; 8-2 and a second tube side fluid inlet and outlet.

Detailed Description

The following description will further describe the embodiments of the shell-and-tube heat exchanger according to the present invention with reference to the examples shown in fig. 4 to 7. The shell and tube heat exchanger of the present invention is not limited to the description of the following embodiments. The radial direction of the shell refers to the radial direction of the tube plate when the heat exchange tube is in an operating state, the left side and the right side refer to the left side and the right side when the heat exchanger is in the position of fig. 2, and the vertical direction refers to the vertical direction of the tube plate when the heat exchange tube is in an operating state.

A shell-and-tube heat exchanger, as shown in fig. 4, comprises a shell 1, a tube sheet 2, heat exchange tubes 3 and a baffle plate 4. The tube plate 2 is located at the end of the shell, the outer periphery of the tube plate 2 is fixedly and hermetically arranged with an opening of the shell 1, multiple groups of heat exchange tubes 3 are arranged in the shell 1 and are at least two groups, each group of heat exchange tubes 3 comprises at least one heat exchange tube 3, the heat exchange tubes 3 are arranged along the axial direction of the shell 1, multiple groups of fluid inlets and outlets correspondingly connected with the multiple groups of heat exchange tubes 3 are arranged on the tube plate 2, the multiple groups of heat exchange tubes 3 and the corresponding multiple groups of fluid inlets and outlets form multiple heat exchange systems, each group of fluid inlets and outlets comprises a fluid inlet 7 and a fluid outlet 8, the baffle plate 4 is arranged in the shell 1, part of the outer periphery of the baffle plate 4 is limited with the inner surface of the shell 1, the fluid inlets 7 and the fluid outlets 8 and internal channels of the heat exchange tubes 3 connected with the fluid inlets and the fluid outlets 8 form tube passes, and the fluid inlets 7 and the fluid outlets 8 of each group of fluid inlets and outlets are respectively arranged on the upper side and the lower side of the tube plate 2 in the vertical direction.

The baffle plates 4 are of a circular structure and are coaxially arranged in the shell 1 to fix the heat exchange tubes 3 and enable fluid in the shell pass to repeatedly change directions to do cross-flow movement or flow in other forms, and the baffle plates 4 are a plurality in total and are uniformly distributed at intervals along the length direction of the shell 1. A first opening 5 and a second opening 6 are arranged on the side wall of the shell 1, one of the first opening 5 and the second opening 6 is an inlet, the other one is an outlet, the first opening 5 and the second opening 6 are communicated with the inner cavity of the shell, and the communicated part of the first opening 5 and the second opening 6 and the inner part of the shell 1 forms a shell pass; offer a plurality of through-holes 41 that supply heat exchange tube 3 to run through on the baffling board 4, heat exchange tube 3 arranges along the radial direction level of casing 1, offers the through-hole 41 that supplies heat exchange tube 3 to run through on the baffling board 4, and the outer peripheral face of heat exchange tube 3 sets up with the outer peripheral face fixed seal of through-hole 41, and the orientation of breach 42 is greater than 0 with the radial contained angle of vertical direction of casing 1.

The utility model discloses a shell and tube heat exchanger, multiunit heat transfer system is improved level on the radial plane of casing and is arranged, first opening and second opening are located the both sides of baffling board, the limit portion of baffling board has the breach, the orientation of breach is greater than 0 with the radial vertical direction contained angle of casing, make shell side fluid flow through a plurality of heat transfer systems in proper order when the breach along adjacent baffling board flows, so relapse, shell side fluid can carry out the heat transfer to the medium in each heat transfer system ceaselessly, even still can effectively the heat transfer at partial heat transfer system during operation, air conditioning unit's performance has just also been promoted.

Preferably, the first opening 5 and the second opening 6 are both disposed on the left side of the casing 1, or the first opening 5 and the second opening 6 are both disposed on the right side of the casing 1, or the first opening 5 and the second opening 6 are disposed on the left side and the right side of the casing 1, respectively, when the first opening 5 is an inlet, the notch 42 of the baffle plate 4 close to the first opening faces a direction away from the first opening 5; when the second opening 6 is an inlet, the notch 42 of the baffle 4 adjacent to the second opening faces away from the second opening 6.

The heat exchange tubes 3 are in multiple groups, each group of heat exchange tubes comprises at least one heat exchange tube 3, two ends of each heat exchange tube 3 are fixed on the tube plate 2 and are respectively connected with the corresponding fluid inlet 7 and the corresponding fluid outlet 8, each heat exchange tube 3 is arranged along the axial direction of the shell 1, the multiple groups of heat exchange tubes are horizontally arranged along the radial direction of the shell 1, the fluid inlets 7 and the fluid outlets 8 of the fluid inlets and the fluid outlets are in multiple groups and are horizontally arranged along the radial direction of the shell 1, the fluid inlets 7 and the fluid outlets 8 of each group of fluid inlets and outlets are respectively arranged on the upper side and the lower side of the tube plate 2 along the vertical direction, each group of heat exchange tubes 3 comprises multiple heat exchange tubes 3 and are respectively connected with the same group of fluid inlets 7 and the same group of fluid outlets 8, and each group of heat exchange tubes 3 and the fluid inlets 7 and the fluid outlets 8 connected with the heat exchange tubes form a heat exchange system.

Two sets of heat exchange tubes 3 and two sets of fluid inlets 7 and fluid outlets 8 will now be described by way of example,

as shown in fig. 4-7, the multi-system shell-and-tube heat exchanger of the present embodiment includes two heat exchange systems formed by two sets of heat exchange tubes and two sets of fluid inlets and outlets, the two sets of fluid inlets and outlets are respectively disposed on the left side and the right side of the tube plate 2 along the horizontal direction, and the two sets of heat exchange tubes are correspondingly horizontally arranged along the radial direction of the shell 1, respectively located on the left side and the right side of the shell 1, and correspond to the two sets of fluid inlets and outlets on the tube plate 2. The first group of heat exchange tubes 3, the group of fluid inlets 7 and the group of fluid outlets 8 form a heat exchange system No. 1, the second group of heat exchange tubes 3, the group of fluid inlets 7 and the group of fluid outlets 8 form a heat exchange system No. 2, and the heat exchange system No. 1 and the heat exchange system No. 2 are horizontally arranged along the radial direction of the shell 1 and are respectively positioned on the left side and the right side of the shell 1.

As shown in fig. 5, the baffle plate 4 is an arc-shaped baffle plate 4, a plurality of through holes 41 for the heat exchange tubes 3 to penetrate through are formed on the baffle plate 4, notches 42 of the baffle plate 4 face to the horizontal position of the radial direction of the shell 1, a quadrant is formed by combining the horizontal line and the vertical line on the baffle plate 4, the through holes 4141 have four total areas and are respectively distributed in the four areas of the quadrant, the notches 42 are formed on the baffle plate 44, and the notches 42 of the baffle plates 44 are alternately arranged at two quadrants, three quadrants and one quadrant. In a preferred mode, a quadrant is formed by combining a horizontal line and a vertical line at the center and passing through the center of the baffle plate 44, it should be noted that the boundary of the quadrant is not necessarily the center line or the horizontal line passing through the center, and the quadrant can be moved left and right according to the arrangement of the heat exchange tubes 3, and the center of the heat exchange tubes 3 is not necessarily coincident with the center of the baffle plate. I.e. the notches 42 of two adjacent baffles 4 are located on the left and right side of the casing 1, respectively. As shown in fig. 7, the side walls of the casing 1 near the two ends are respectively provided with a first opening 5 and a second opening 6, the through positions of the first opening 5 and the second opening 6 and the inside of the casing 1 form a shell pass, and the first opening 5 and the second opening 6 are located on the left side wall or the right side wall of the casing 1, that is, the first opening 5 and the second opening 6 are located on the horizontal side wall corresponding to the notch 42 of the baffle plate 4.

As shown in fig. 6, when the heat exchanger of this embodiment works, a tube-side refrigerant flows in from the fluid inlet 7, passes through the heat exchange tube 3, and flows out from the fluid outlet 8, a shell-side fluid enters from the second opening 6, and flows into the first opening 5 along the gap 42 of the adjacent baffle plate 4, so as to complete a complete shell side, and achieve heat exchange between the shell-side fluid and the tube-side refrigerant; and because the gap 42 of the baffle plate 4 is arranged at the left and right sides of the baffle plate 4, a plurality of groups of heat exchange tubes are horizontally arranged along the radial direction of the shell 1, and the fluid inlet 7 and the fluid outlet 8 are respectively arranged at the upper side and the lower side of the tube plate 2 along the vertical direction, so that the direction of the shell-side fluid flowing along the gap 42 of the adjacent baffle plate 4 is approximately perpendicular to the first group of heat exchange tubes of the No. 1 heat exchange system and the second group of heat exchange tubes of the No. 2 heat exchange system, the shell-side fluid flows into the second group of heat exchange tubes at the right side from the left side of the first group of heat exchange tubes 3 arranged in the shell 1 for heat exchange, and then returns to the first group of heat exchange tubes at the left side from the left and right sides of the second group of heat exchange tubes 3 arranged in the shell 1 for heat exchange, and the process the heat exchange, even if only one group of systems in the No. 1 and No. 2 heat exchange systems works, all the shell-side fluid can continuously exchange the heat exchange the refrigerant in the heat exchange systems, every minute refrigerant can not be wasted, the effect of flow bypass can not be generated, and the performance of the air conditioning unit is improved.

For general design, when only the heat exchange system No. 1 of the double-system shell-and-tube heat exchanger operates, as shown in FIG. 4, it is assumed that the temperature of the second opening 6 at the shell side in the heat exchanger is Twi, the temperature of fluid in the heat exchange tube 3 of the operating system (the heat exchange system No. 1) is Te, and no fluid exists in the heat exchange tube 3 of the non-operating system (the heat exchange system No. 2) and does not participate in heat exchange; the temperature of the fluid corresponding to the first opening 5 of the heat exchange system No. 1 is Two _1, and the temperature of the fluid corresponding to the first opening 5 on the shell side of the system No. 2 is Two _2, and because the fluid on the shell side does not flow perpendicular to the inlet and outlet of the fluid on the shell side in the operation process, Two _2 can be regarded as Two; at this time, the heat transfer temperature difference Δ T1 of the heat exchange system is (Twi + Two _ 1)/2-Te.

For the design of the application, as shown in fig. 5, it is assumed that the temperature of the second opening 6 on the shell side in the heat exchanger is Twi, the temperature of fluid in the heat exchange tube 3 of the operating system (heat exchange system No. 1) is Te, and no fluid exists in the heat exchange tube 3 of the non-operating system (heat exchange system No. 2) and does not participate in heat exchange; as the shell-side fluid is guided by the notch 42 of the baffle plate 4 to repeatedly flow between the first group of heat exchange tubes of the heat exchange system No. 1 and the second group of heat exchange tubes of the heat exchange system No. 2, the temperature of the fluid in the first opening 5 on the shell-side is Two _1 'and Two _ 2', and at this time, Two _1 'is Two _ 2'; at the moment, the heat transfer temperature difference delta T2 of the heat exchange system is (Twi + Two _1 ')/2-Te is (Twi + Two _ 2')/2-Te.

Obviously Two _1 '═ Two _ 2' > Two _1, i.e. Δ T2> Δ T1; the heat transfer difference in temperature is big more, and the heat transfer effect is better, so this patent design can promote the heat transfer effect when two system shell and tube heat exchanger part system moves.

In a similar way, the scheme of the patent is also suitable for the shell and tube heat exchanger comprising more than 2 systems.

Preferably, the first opening 5 and the second opening 6 are located on the left and right side walls of the casing 1, so that the fluid can more rapidly flow into the gap 42 of the baffle 4 for heat exchange.

Optionally, each heat exchange tube 3 is of a linear structure, and two ends of each heat exchange tube 3 are connected to a fluid inlet 7 and a fluid outlet 8 of a corresponding group of fluid inlets and outlets, where the fluid inlet 7 and the fluid outlet 8 are respectively located at two sides of the shell 1.

Preferably, every heat exchange tube 3 all is U type or linear type structure to the both ends of heat exchange tube 3 link to each other with fluid inlet 7 and fluid outlet 8 that a set of fluid of correspondence was imported and exported, and the heat exchange tube 3 of U type structure sets up along vertical direction, makes the both sides pipeline of U type structure be located vertical direction's upside and downside respectively, and the residence time when the medium is cooled down in heat exchange tube 3 has been prolonged in the design of U type, has also improved the efficiency of heat transfer. When the heat exchange tube 3 is in a U shape, the fluid inlet 7 and the fluid outlet 8 are positioned at the same end of the shell-and-tube heat exchanger, when the heat exchange tube 3 is in a straight line shape, two ends of the heat exchange tube 3 are connected with the fluid inlet 7 and the fluid outlet 8 of the corresponding group of fluid inlets and outlets, and the fluid inlet 7 and the fluid outlet 8 are respectively positioned at two ends of the shell-and-tube heat exchanger.

Preferably, each group of heat exchange tubes comprises a plurality of heat exchange tube rows arranged in the vertical direction, each heat exchange tube row comprises a plurality of heat exchange tubes 3 with different sizes, the heat exchange tube 3 with a larger size is positioned at the outer side of the heat exchange tube 3 with a smaller size, the distance between the two ends of the bent part of the heat exchange tube 3 positioned at the outer side is greater than the distance between the two ends of the bent part of the heat exchange tube 3 positioned at the inner side, and the distance between the medium inlet and the medium outlet of the heat exchange tube 3 positioned at the outer side is greater than the distance between the medium inlet and the medium outlet of the heat exchange tube 3 positioned at the inner side.

As shown in fig. 4, 7 and 8, preferably, a plurality of first receiving cavities 241 located at the upper part and a plurality of second receiving cavities 242 located at the lower part are formed in the tube plate 2, each first receiving cavity 241 is connected with the medium inlets of all the heat exchange tubes 3 of the corresponding group of heat exchange tubes and is connected with a corresponding one of the fluid inlets 7, each second receiving cavity 242 is connected with the medium outlets of all the heat exchange tubes 3 of the corresponding group of heat exchange tubes and is connected with a corresponding one of the fluid outlets 8, a medium flows into the first receiving cavity 241 before entering the heat exchange tubes 3 from the fluid inlets 7, and the medium flows into the second receiving cavity 242 before flowing out from the fluid outlets 8 in the heat exchange tubes 3, so that all the media uniformly enter and flow out, the medium flow is more efficient, and the assembly is also convenient.

Preferably, the tube plate 2 includes an inner tube plate 20 located at the inner side, an outer tube plate 22 located at the middle part, and an access flange 23 located at the outer side, the inner tube plate 20 has a mounting cavity 21 formed therein, the end of the shell 1 is inserted into the mounting cavity 21 and connected to the inner tube plate 20, the outer tube plate 22 has a connecting groove 221 communicating with the heat exchange tube 3, the outer tube plate 22 has a sealing and protecting function on the inner tube plate 20, the access flange 23 is connected to the inner tube plate 20 and the outer tube plate 22 by bolts, the fluid inlet 7 and the fluid outlet 8 are connected to the access flange 23, the access flange 23 is connected to the outer tube plate 22 by a receiving plate 24, and the first receiving cavity 241 and the second receiving cavity 242 are formed in the receiving plate 24.

Preferably, a sealing ring 25 is connected between the inner tube plate 20 and the outer tube plate 22, and the sealing plate can seal the gap between the inner tube plate 20 and the outer tube plate 22 to prevent gas leakage.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A shell-and-tube heat exchanger comprises a shell (1), a tube plate (2), heat exchange tubes (3) and a baffle plate (4), wherein the shell (1) is tubular and is enclosed to form an inner cavity, at least one end of the shell (1) is opened, the tube plate (2) is arranged at the end part of the shell, the outer periphery of the tube plate (2) is fixedly and hermetically arranged with the opening of the shell, at least two groups of heat exchange tubes are arranged in the shell (1), each group of heat exchange tubes comprises at least one heat exchange tube (3), the heat exchange tubes (3) are arranged along the axial direction of the shell (1), through holes correspondingly communicated with the heat exchange tubes (3) are arranged on the tube plate (2), the baffle plate (4) is arranged in the shell (1), part of the outer periphery of the baffle plate is limited to the inner surface of the shell, and a through hole (41) for the heat exchange tubes (3) to penetrate through is formed in the baffle plate (4), the outer peripheral surface of the heat exchange tube and the inner peripheral surface of the through hole are fixedly and hermetically arranged, a first opening (5) and a second opening (6) are arranged on the side wall of the shell (1), one of the first opening (5) and the second opening (6) is an inlet, the other one of the first opening (5) and the second opening (6) is an outlet, the first opening (5) and the second opening (6) are communicated with the inner cavity of the shell, and the first opening (5) and the second opening (6) are positioned on two sides of the baffle plate (4), and the heat exchange tube is characterized in that:

the heat exchange tubes (3) are horizontally arranged along the radial direction of the shell (1), the edge of the baffle plate (4) is provided with a notch (42), and the included angle between the orientation of the notch (42) and the radial vertical direction of the shell (1) is greater than 0 degree.

2. The shell and tube heat exchanger as set forth in claim 1 wherein: the notch (42) of the baffle plate (4) faces to the radial horizontal direction of the shell (1).

3. The shell and tube heat exchanger as set forth in claim 1 or 2, wherein: when the first opening (5) is an inlet, the direction of the gap (42) of the baffle plate (4) close to the first opening is far away from the first opening (5); when the second opening (6) is an inlet, the notch (42) of the baffle plate (4) close to the first opening faces away from the second opening (6).

4. The shell and tube heat exchanger as set forth in claim 1 wherein: the heat exchanger comprises two groups of heat exchange tubes (3) and two groups of fluid inlet and outlet formed heat exchange systems, wherein the two groups of fluid inlet and outlet are respectively arranged on the left side and the right side of a tube plate (2) in the horizontal direction, and the two groups of heat exchange tubes are correspondingly horizontally arranged in the radial direction of a shell (1) and are respectively positioned on the left side and the right side of the shell (1).

5. The shell and tube heat exchanger as set forth in claim 1 wherein: at least part of the heat exchange tubes (3) are of a U-shaped structure, two ends of each heat exchange tube (3) are connected with a fluid inlet (7) and a fluid outlet (8) of a corresponding group of fluid inlets and outlets, the heat exchange tubes (3) of the U-shaped structure are arranged along the vertical direction, so that pipelines on two sides of the U-shaped structure are respectively positioned on the upper side and the lower side of the vertical direction, and the fluid inlets (7) and the fluid outlets (8) are positioned at the same end of the shell-and-tube heat exchanger;

or the heat exchange tube (3) is a straight tube, two ends of the heat exchange tube (3) are connected with the fluid inlet (7) and the fluid outlet (8) of the corresponding group of fluid inlet and outlet, and the fluid inlet (7) and the fluid outlet (8) are respectively positioned at two ends of the shell-and-tube heat exchanger.

6. The shell and tube heat exchanger as set forth in claim 5 wherein: every group heat exchange tube includes the heat exchange tube row that the multiseriate set up along vertical direction, every heat exchange tube row includes a plurality of heat exchange tubes (3) of size difference, the great heat exchange tube of size (3) are located the outside of the less heat exchange tube of size (3), the distance at the flexion both ends of the heat exchange tube (3) that are located the outside is greater than the distance at the flexion both ends of the heat exchange tube (3) that are located the inboard, the distance between the medium entry and the medium export of the heat exchange tube (3) that are located the outside is greater than the distance between the medium entry and the medium export of the heat exchange tube (3) that are located the inboard.

7. The shell and tube heat exchanger as set forth in claim 1 wherein: the number of the baffle plates (4) is at least two, the baffle plates (4) are distributed at intervals along the length direction of the shell (1), gaps (42) of the baffle plates (4) are arranged in a staggered mode, and the directions of the gaps (42) of two adjacent baffle plates (4) are opposite;

when the first opening (5) is an inlet, the direction of the gap (42) of the baffle plate (4) close to the first opening is far away from the first opening (5); when the second opening (6) is an inlet, the notch (42) of the baffle plate (4) close to the first opening faces away from the second opening (6).

8. The shell and tube heat exchanger as set forth in claim 7 wherein: the notches (42) of the baffle plates (4) face to the horizontal position of the radial direction of the shell (1) to form quadrants by combining horizontal lines and vertical lines on the baffle plates (4), the through holes (41) are four areas in total and are distributed in the four areas of the quadrants respectively, and the notches (42) of the baffle plates (4) are arranged at the positions of two quadrants, three quadrants and one quadrant in a staggered manner.

9. The shell and tube heat exchanger as set forth in claim 1 wherein: the first opening (5) and the second opening (6) are arranged on the left side of the shell (1), or the first opening (5) and the second opening (6) are arranged on the right side of the shell (1), or the first opening (5) and the second opening (6) are arranged on the left side and the right side of the shell (1) respectively.

10. The shell and tube heat exchanger as set forth in any one of claims 1-2 or 4-9 wherein: a plurality of first accommodating cavities (241) positioned at the upper part and a plurality of second accommodating cavities (242) positioned at the lower part are formed in the tube plate (2), each first accommodating cavity (241) is connected with the medium inlets of all the heat exchange tubes (3) of the corresponding group of heat exchange tubes and is connected with a corresponding fluid inlet (7), and each second accommodating cavity (242) is connected with the medium outlets of all the heat exchange tubes (3) of the corresponding group of heat exchange tubes and is connected with a corresponding fluid outlet (8);

the pipe plate (2) comprises an inner pipe plate (20) located on the inner side, an outer pipe plate (22) located at the middle part and an inlet and outlet flange (23) located on the outer side, a mounting cavity (21) is formed in the inner part of the inner pipe plate (20), the end part of the shell (1) is inserted into the mounting cavity (21) and connected with the inner pipe plate (20), a connecting groove (221) communicated with the heat exchange pipe (3) is formed in the outer pipe plate (22), the inner pipe plate (20) is sealed and protected by the outer pipe plate (22), the inlet and outlet flange (23) is connected with the inner pipe plate (20) and the outer pipe plate (22) through bolts, a fluid inlet (7) and a fluid outlet (8) are connected onto the inlet and outlet flange (23), a containing plate (24) is connected between the inlet and outlet flange (23) and the outer pipe plate (22), and a first containing cavity (241) and a second containing cavity (242) are formed in the containing plate (24).

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