CN116951827A - Flooded heat exchanger and marine lithium bromide refrigerating unit comprising same - Google Patents

Abstract

A flooded heat exchanger comprising: a housing having a first media inlet, a first media outlet, a second media inlet, a second media outlet, the housing defining a first volume and a second volume in fluid communication with the second media inlet and the second media outlet, the first volume for containing a second media, the first volume being below a level of the second media, the second volume being above the level of the second media; the heat exchange tubes are arranged in the shell along the length direction of the shell, the heat exchange tubes are arranged in the first containing cavity, and two ends of each heat exchange tube are respectively in fluid communication with the first medium inlet and the first medium outlet; a plurality of water conservancy diversion units that set up along the length direction of casing in the casing, wherein every water conservancy diversion unit includes: a wave blocking structure having a plurality of enclosures through a portion of which heat exchange tubes pass, the enclosures being arranged to confine the second medium contained in the first chamber between the housing and the enclosures of the respective flow directing units.

Description

Flooded heat exchanger and marine lithium bromide refrigerating unit comprising same

Technical Field

The present application generally relates to a flooded heat exchanger and a marine lithium bromide refrigeration unit comprising the flooded heat exchanger.

Background

In the flooded heat exchanger of the prior art, a heat exchange tube is arranged, the heat exchange tube is internally used for flowing a first medium, the heat exchange tube is externally used for accommodating a second medium, and the heat exchange tube needs to be immersed below the liquid level of the second medium so that the first medium in the heat exchange tube can exchange heat with the second medium through the tube wall of the heat exchange tube. However, when the flooded heat exchanger is used in some oscillation environments, such as marine environments, the oscillation environment may cause fluctuation of the liquid level of the second medium, and it is difficult to ensure that the heat exchange tube is completely immersed, thereby affecting the heat exchange efficiency of the heat exchanger. Specifically, when the flooded heat exchanger is used as a generator of a lithium bromide refrigeration unit for a ship, jolt and slosh are generated when the ship runs, thereby causing flow of the second medium in the flooded heat exchanger in the length, width directions and oscillation in the height direction of the flooded heat exchanger. Such flow and oscillations can cause maldistribution of the second medium within the flooded heat exchanger, thereby causing a portion of the heat exchange tubes to be exposed above the liquid level of the second medium, thereby reducing heat exchange efficiency.

Disclosure of Invention

In view of this, the present application provides a flooded heat exchanger comprising: a housing having a first media inlet, a first media outlet, a second media inlet, a second media outlet thereon, the housing defining first and second plenums in fluid communication with the second media inlet and the second media outlet, wherein the first plenums are configured to contain the second media, the first plenums are configured to be below a liquid level formed by the second media, and the second plenums are configured to be above a liquid level formed by the second media; a plurality of heat exchange tubes disposed within the housing along a length direction of the housing, the heat exchange tubes being disposed within the first volume, wherein both ends of the heat exchange tubes are in fluid communication with the first medium inlet and the first medium outlet, respectively, such that the heat exchange tubes are configured to receive a first medium; a plurality of flow guiding units arranged in the shell along the length direction of the shell; wherein each of the flow directing units comprises: a wave blocking structure comprising at least one shroud through at least a portion of which the heat exchange tubes pass, the at least one shroud being arranged to confine the second medium contained in the first plenum between the housing and the shroud of each flow directing unit to at least partially restrict the flow of the second medium in the length and width directions of the flooded heat exchanger.

According to one aspect of the aforementioned flooded heat exchanger, each of the flow-guiding units further comprises: a pressure wave structure disposed on a top side of at least a portion of the at least one shroud, the pressure wave structure being configured to at least partially restrict flow of the second medium in a height direction of the flooded heat exchanger.

According to one aspect of the aforementioned flooded heat exchanger, the at least one shroud comprises a top plate, a pair of wings connected on opposite sides of the top plate, and a pair of side plates connected between the outer sides of the side plates and the side walls of the housing, such that a defined area for accommodating the second medium can be formed between the shroud of an adjacent wave blocking structure or between the housing and the shroud of the wave blocking structure; and a plurality of holes are formed in the top plate and the wing plates for the heat exchange tubes to pass through.

According to one aspect of the flooded heat exchanger, a plurality of the flow guiding units are arranged in a plurality of layers on the height of the shell, wherein the flow guiding units in the odd layers are staggered with the flow guiding units in the even layers.

According to one aspect of the aforementioned flooded heat exchanger, the wave blocking structure of each flow guiding unit comprises a front side connecting portion and a rear side connecting portion, the front side connecting portion is located on the side plate near the connection of the side plate and the top plate, and the rear side connecting portion is located on the side plate near the connection of the side plate and the wing plate; the front side connecting part of each flow guiding unit is combined or suspended with the rear side connecting part of the adjacent flow guiding unit in the adjacent layer, and the rear side connecting part of each flow guiding unit is combined or suspended with the front side connecting part of the adjacent flow guiding unit in the adjacent layer, so that the staggered layer structure is formed repeatedly.

According to one aspect of the aforementioned flooded heat exchanger, the pressure wave structure is integrally formed with the wave blocking structure or welded together with the wave blocking structure.

According to one aspect of the aforementioned flooded heat exchanger, the pressure wave structure includes a pressure plate, a lower surface of which is connected to a top of the shroud and extends to both inside and outside of the corresponding shroud to block a flow of the second medium in the defined area in a height direction.

According to one aspect of the aforementioned flooded heat exchanger, the pressure wave structure comprises pressure plates, the sides of which are connected to both sides of the top of the shroud and extend from one side of the respective shroud to the other side to block the flow of the second medium in the defined area in the height direction.

According to one aspect of the flooded heat exchanger, the pressure plate is in a planar structure, an arc structure, a wavy structure or a zigzag structure.

According to one aspect of the flooded heat exchanger, the flow guiding unit of the lowest one of the plurality of layers is provided with a flow channel for the second medium to flow through at the bottom thereof.

The application also provides a marine lithium bromide refrigerating unit, which is characterized in that: comprising the following steps: an evaporator, an absorber, a condenser, a heat exchanger, a solution circulation pump and a generator; wherein the generator comprises a flooded heat exchanger of any of the preceding claims.

Drawings

Fig. 1 is a system diagram of a marine lithium bromide refrigeration unit comprising a flooded heat exchanger in accordance with the application.

Fig. 2A is a perspective view of the flooded heat exchanger of fig. 1 from one angle.

Fig. 2B is a perspective view of the flooded heat exchanger of fig. 1 from another angle.

Fig. 3A is a top view of the flooded heat exchanger shown in fig. 2A.

Fig. 3B is a sectional view of the flooded heat exchanger shown in fig. 2A taken along section line A-A in fig. 3A.

Fig. 3C is a sectional view of the flooded heat exchanger shown in fig. 2A taken along section line B-B in fig. 3A.

Fig. 3D is a sectional view of the flooded heat exchanger shown in fig. 2A taken along section line C-C in fig. 3A.

Fig. 4 is a perspective view of a flow guide unit and a heat exchange tube in the flooded heat exchanger of fig. 2A.

Fig. 5A is a perspective view of a structure of the plurality of flow guiding units in fig. 4.

Fig. 5B is a side view of the plurality of deflector units of fig. 4.

Fig. 6 is a perspective view of one embodiment of the single deflector unit of fig. 5A.

Fig. 7 is a perspective view of another embodiment of the single deflector unit of fig. 5A.

Fig. 8 is a perspective view of still another embodiment of the single deflector unit of fig. 5A.

Detailed Description

Various embodiments of the present application are described below with reference to the accompanying drawings, which form a part hereof. It is to be understood that, although various terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "top", "bottom", etc., may be used herein to describe various exemplary structural portions and components of the present application, these terms are used herein for convenience of description and are determined based on the exemplary orientations shown in the drawings. Since embodiments of the present application may be arranged in different orientations, these directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is a system diagram of a marine lithium bromide refrigeration unit 100 comprising a flooded heat exchanger 101 of the application. As shown in fig. 1, the marine lithium bromide refrigeration unit 100 includes an evaporator 102, an absorber 103, a condenser 104, and a generator 101. In the present embodiment, the generator 101 is a flooded heat exchanger 101. In the marine lithium bromide refrigeration unit 100 of the present application, water is used as a refrigerant, lithium bromide is used as an absorbent, and the change in concentration of the aqueous solution of lithium bromide and the phase change of water are used to externally cool. The flooded heat exchanger 101 comprises two working mediums, in this embodiment, the flooded heat exchanger 101 is used as a generator in the marine lithium bromide refrigeration system 100, the first medium of the flooded heat exchanger 101 is driving heat source water, and the second medium is lithium bromide solution. Specifically, the lithium bromide concentrated solution gives a lithium bromide dilute solution after absorbing the coolant water vapor in the absorber 103, and releases heat from the cooling water inlet 1042. The dilute lithium bromide solution then enters the heat exchanger 105 via the solution circulation pump 106, absorbs heat in the heat exchanger 105 and enters the generator 101. The dilute lithium bromide solution absorbs heat from the first medium at the first medium inlet 1011 in the generator 101, such that water in the dilute lithium bromide solution is evaporated to obtain a concentrated lithium bromide solution. The concentrated lithium bromide solution is then discharged from the generator 101 to the heat exchanger 105, where heat is released in the heat exchanger 105 and returned to the absorber 103, thereby completing the cycle of the lithium bromide solution.

In the generator 101, the lithium bromide dilute solution is heated by the driving heat source water and evaporates to produce water vapor; the evaporated water vapor is first condensed into liquid water by releasing heat from the refrigerant from the absorber 103 in the condenser 104. Since the internal pressure of the condenser 104 is higher than that of the evaporator 102, the liquid water discharged from the condenser 104 is flashed and enters the bottom of the evaporator 102, then is delivered to the top of the evaporator 102 through the refrigerant pump 107, is distributed by the drip box 1021, absorbs the heat of the chilled water from the chilled water inlet 1043, evaporates into the refrigerant vapor, and enters the absorber 103, and the refrigerant vapor is absorbed by the lithium bromide concentrated solution distributed by the spray box 1031 of the absorber 103 to obtain the lithium bromide dilute solution. The dilute lithium bromide solution enters the generator 101 as described above and evaporates to obtain water vapor. Thereby completing the circulation of the coolant water.

The chilled water inlet 1043 and the chilled water outlet 1044 are in fluid communication such that chilled water flows through heat exchange tubes within the evaporator 102, providing heat to the chilled water in the evaporator 102, and thereby providing refrigeration to the outside, i.e., refrigeration to the outside.

The first medium inlet 1011 and the first medium outlet 1012 are for fluid communication with a first medium. When the flooded heat exchanger is used as a generator, the first medium typically has a relatively high temperature and the first medium can enter the heat exchange tubes within the generator 101 to provide heat to the lithium bromide solution in the generator 101. In other examples, the first medium may also be hot water, steam, flue gas, or the like.

The cooling water inlet 1042 and the cooling water outlet 1041 are for fluid communication with the cooling water. The cooling water typically has a lower temperature to provide refrigeration to the lithium bromide solution in the absorber 103 and to the refrigerant water in the condenser 104. The cooling water firstly enters the heat exchange tube in the absorber 103 from the cooling water inlet 1042, absorbs heat released when the lithium bromide concentrated solution absorbs the refrigerant steam through the heat exchange tube and heats up, then enters the heat exchange tube in the condenser 104 to condense the refrigerant steam in the condenser 104, and finally is discharged out of the condenser 104 through the cooling water outlet 1041.

The operation of the marine lithium bromide refrigeration unit 100 is described in detail below in conjunction with fig. 1: the refrigerant is delivered to the drip box 1021 in the evaporator 102 through the refrigerant pump 107 and drips on the heat exchange tube in the evaporator 102, the heat exchange tube is connected with the chilled water inlet 1043 and the chilled water outlet 1044, the liquid refrigerant water drips on the heat exchange tube exchanges heat with the chilled water in the heat exchange tube to generate refrigerant water vapor, the refrigerant water vapor enters the absorber 103, and the chilled water in the heat exchange tube is cooled and then is output to external equipment to provide a cold source. After entering the absorber 103, the refrigerant vapor is absorbed by the lithium bromide concentrated solution dripped from the spray box 1031 at the top of the absorber 103, the generated dilution heat is taken away by cooling water in the heat exchange tube connected with the cooling water inlet 1042 in the absorber 103, and the cooling water enters the heat exchange tube of the condenser 104 after being heated. The lithium bromide dilute solution in the absorber 103 is pumped out by the solution circulating pump 106 and enters the heat exchanger 105, after heat exchange is performed between the lithium bromide dilute solution in the heat exchanger 105 and the lithium bromide concentrated solution coming out of the generator 101, the lithium bromide dilute solution enters the generator 101 through the second medium inlet 1013, a heat exchange tube is arranged in the generator, the heat exchange tube is in fluid communication with the first medium inlet 1011 and the first medium outlet 1012 of the generator 101, a driving heat source flows through the inside of the heat exchange tube, the heat exchange tube is immersed by the lithium bromide dilute solution entering the generator 101, the lithium bromide dilute solution is subjected to heat exchange with the driving heat source in the heat exchange tube through the heat exchange tube, the lithium bromide dilute solution is evaporated into the lithium bromide concentrated solution, meanwhile, the refrigerant vapor is generated, the lithium bromide concentrated solution enters the heat exchanger 105 through the second medium outlet 1014 and is subjected to heat exchange with the lithium bromide dilute solution coming out of the absorber 103, then enters the top of the absorber 103 for drip, and the refrigerant vapor enters the condenser 104 through the vapor outlet 251 (shown in fig. 2A). In the condenser 104, the refrigerant vapor exchanges heat with the cooling water in the heat exchange tube, the refrigerant vapor condenses into liquid and enters the evaporator 102, and due to the pressure difference between the condenser 104 and the evaporator 102, part of the liquid water changes phase in the evaporator 102, and the other part of the liquid refrigerant water becomes lower-temperature refrigerant water and circulates into the drip box 1021 of the evaporator 102 to drip, and the cooling water in the heat exchange tube flows out of the condenser 104 through the cooling water outlet 1041. Cooling water in the heat exchange tube of the condenser 104 is heated continuously, enters an external cooling tower for heat exchange, and then circularly enters the heat exchange tube of the absorber 103. Thus forming a refrigeration circuit.

It should be noted that although the flooded heat exchanger 101 is used in the marine lithium bromide refrigeration unit 100 herein, it should be appreciated that the flooded heat exchanger 101 is not limited to marine applications, but may be used in refrigeration units for other applications, particularly in applications where jolting or jolting may occur, such as in high-altitude towers, in aircraft, and in refrigeration applications. The flooded heat exchanger 101 of the present application is not limited to a lithium bromide refrigeration system, and may be used in other suitable systems, and only a flooded heat exchanger is required.

Fig. 2A and 2B show perspective structural views of the flooded heat exchanger 101 according to the application from two different angles for illustrating an external structure of the flooded heat exchanger 101, wherein fig. 2A shows a perspective structural view of the flooded heat exchanger 101 from front to back, and fig. 2B shows a perspective structural view of the flooded heat exchanger 101 from back to front. As shown in fig. 2A and 2B, the flooded heat exchanger 101 includes a housing 201, the housing 201 having a first medium inlet 1011, a first medium outlet 1012, a second medium inlet 1013, a second medium outlet 1014, a vapor outlet 251, and an optional second medium drain 252. The housing 201 defines a cavity 320 therein, and a plurality of heat exchange tubes 311 are disposed in the cavity 320 (see fig. 3B). The first medium inlet 1011, the first medium outlet 1012 are in fluid communication with the heat exchange tubes 311 within the housing 201 to flow the first medium through each heat exchange tube 311. The first medium serves as a heat source to provide heat, and may be a liquid or a fluid such as a gas. The second medium inlet 1013, the second medium outlet 1014 are in fluid communication with the chamber 320 within the housing 201 to move the second medium into/out of the chamber 320. In this embodiment, the flooded heat exchanger 101 acts as a generator, so the first medium is the driving heat source water and the second medium is the lithium bromide solution. Specifically, the lithium bromide dilute solution enters the accommodating cavity 320 from the second medium inlet 1013, and exchanges heat with the first medium in each heat exchange tube 311 in the accommodating cavity 320, so that water in the lithium bromide dilute solution is evaporated into water vapor, and the lithium bromide dilute solution is converted into a lithium bromide concentrated solution. The steam outlet 251 is connected to the condenser 104 shown in fig. 1 to deliver the generated steam to the condenser 104.

In the embodiment shown in fig. 2A and 2B, the housing 201 is substantially rectangular box-shaped, a pair of tube plates 202, 203 are respectively provided on opposite sides in the length direction thereof, tube holes 205, 206 are respectively provided on the pair of tube plates 202, 203, both ends of the heat exchange tube 311 pass through the tube holes 205, 206 on the pair of tube plates 202, 203 and are supported by the tube plates 202, 203, respectively, and a first medium can flow into the heat exchange tube from one end of the heat exchange tube 311 and flow out from the other end of the heat exchange tube 311, so that one end of the heat exchange tube 311 constitutes a first medium inlet 1011, and the other end of the heat exchange tube 311 constitutes a first medium outlet 1012.

As shown in fig. 2A and 2B, a box-shaped valve body 204 protruding outward is provided on one side surface in the width direction of the housing 201, the box-shaped valve body 204 being located at the right end of the housing 201. The bottom of the box-shaped valve body 204 is provided with a second medium inlet 1013 and a second medium outlet 1014 in fluid communication with the chamber 320, such that the second medium can enter the chamber 320 from the second medium inlet 1013 and can flow out of the chamber 320 from the second medium outlet 1014. The specific structure of the inside of the case 201 will be described in detail with reference to fig. 3A to 3D.

As shown in fig. 2A, the top of the right side of the case 201 protrudes upward to divide the case 201 into a first case 281 and a second case 282 in the length direction thereof, wherein the first case 281 is lower in height than the second case 282. Several heat exchange tubes 311 are provided in the housing 201 in the same length direction. And the height of the plurality of heat exchange tubes 311 is limited to the height range of the first housing 281. The steam outlet 251 is provided at the top of the second housing 282 to discharge steam, for example, to the condenser 104. In the case where the number of heat exchange tubes 311 is fixed, the height of the first housing 281 and the height of the second housing 282 are set according to the arrangement height of the heat exchange tubes 311, and a space for the flow of steam outside the heat exchange tubes 311 may be left in the second housing 282, or a second medium for immersing the heat exchange tubes 311 may be set within the height range of the first housing 281. The case 201 of the present embodiment can facilitate steam generation and discharge, compared to a square case having the same height as the first case 281. Compared to a square housing having the same height as the second housing 282, the housing 201 of the present embodiment saves the amount of the second medium for immersing the heat exchange tube 311. As will be appreciated by those skilled in the art, the steam outlet 251 may be connected to the condenser 104 by a pipe to discharge the refrigerant water vapor generated by the flooded heat exchanger 101 from the steam outlet 251 to the condenser 104.

In this embodiment, an optional second medium drain 252 is provided at the bottom of the housing 201. The second medium drain 252 is a valve that can be opened or closed. During operation of the generator, the second medium drain 252 is normally closed. If it is desired to drain the second medium from the chamber 320 after the generator is deactivated, the second medium from the chamber 320 may be drained by opening the second medium drain 252.

It should be noted that while fig. 2A and 2B illustrate specific configurations and locations of the first medium inlet 1011, the first medium outlet 1012, the second medium inlet 1013, the second medium outlet 1014, the vapor outlet 251, and the optional second medium evacuation device 252, these configurations and locations are in no way limiting, and in other embodiments, their configurations and locations may vary accordingly.

Fig. 3A to 3D show an internal structure of the flooded heat exchanger, in which fig. 3A is a plan view of the flooded heat exchanger, fig. 3B is a sectional view of the flooded heat exchanger shown in fig. 2A taken along a sectional line A-A in fig. 3A, fig. 3C is a sectional view of the flooded heat exchanger shown in fig. 2A taken along a sectional line B-B in fig. 3A, and fig. 3D is a sectional view of the flooded heat exchanger shown in fig. 2A taken along a sectional line C-C in fig. 3A. Fig. 3B and 3C are used to more clearly show the connection relationship of the second medium inlet 1013, the second medium outlet 1014, and the second medium internal pipe 353. As shown in fig. 3B and 3C, second medium inlet 1013 is in fluid communication with second medium internal line 353 via coupling 352, and second medium internal line 353 is in fluid communication with chamber 320 such that second medium inlet 1013 is in fluid communication with chamber 320. Specifically, the interior of the box-shaped valve body 204 is a hollow structure that is in fluid communication with a cavity 320 in the housing 201. A tube fitting 352 is provided within the box valve body 204, the tube fitting 352 being generally hollow, right angle elbow shaped. In the direction shown in fig. 3C, the bottom end of the pipe joint 352 in the vertical direction is connected to the second medium inlet 1013, and the right end of the pipe joint 352 in the horizontal direction is connected to the second medium inner pipe 353. The second media outlet 1014 is directly connected to the bottom end of the box-shaped valve body 204 and is in fluid communication with the interior of the box-shaped valve body 204.

The second medium internal pipe 353 has a hollow long pipe shape, and is provided in the cavity 320 of the housing 201, and has one end connected to the pipe joint 352 and the other end opened to the cavity 320. For example, in the embodiment of fig. 3B, the left end of second media interior line 353 is connected to adapter 352 and the right end thereof is open to vessel 320 to fluidly connect second media interior line 353 to vessel 320. Of course, the configuration of second medium internal pipe 353 is not limited thereto. In the orientation shown in fig. 3B, second media internal conduit 353 extends generally horizontally from left to right at left-hand end fitting 352 to the right-hand end of housing 201. Accordingly, the second medium can enter the pipe joint 352 from the second medium inlet 1013, then be discharged into the cavity 320 along the second medium internal pipeline 353, after being accumulated to a certain height, the second medium submerges the plurality of heat exchange pipes 311 and exchanges heat with the first medium in the heat exchange pipes 311, and after the heat exchange is completed, the second medium leaves the cavity 320 through the second medium outlet 1014.

It will be appreciated by those skilled in the art that although the present embodiment includes one tube connector 352 and one second medium internal tube 353 connected to the second medium inlet 1013, in other embodiments, the tube connector 352 may be provided in plurality, or have a plurality of outlets, and the corresponding second medium internal tube 353 may be provided in plurality.

Fig. 3C and 3D show a more specific internal structure of the flooded heat exchanger 101. As shown in fig. 3C and 3D, the housing 201 defines a cavity 320, the cavity 320 including a first cavity 325 located below and a second cavity 326 located above. In an embodiment of the application, the first chamber 325 and the second chamber 326 are not fixed interfaces, but are defined by a liquid surface 327 of the second medium, the first chamber 325 being located below the liquid surface 327 of the second medium for containing the second medium; the second chamber 326 is located above the liquid level 327 of the second medium for containing water vapor.

As further shown in fig. 3B to 3D, the heat exchanging pipe 311 is disposed in the first receiving chamber 325 and passes through a plurality of flow guiding units 342, and the plurality of flow guiding units 342 are disposed at intervals along the length direction of the housing 201 and connected to the inner wall of the housing 201. Thereby, the plurality of flow guiding units 342 can support the heat exchanging pipe 311 in the length direction and restrict the flow of the second medium in the first receiving chamber 325. It will be appreciated by those skilled in the art that in the present embodiment, the plurality of flow guiding units 342 are each independently connected to the inner wall of the housing 201, and in other embodiments, the plurality of flow guiding units may be constructed as one integral piece to be integrally connected to the inner wall of the housing 201.

In the present embodiment, each flow guiding unit includes a wave blocking structure for at least partially restricting the flow of the second medium in the first receiving cavity 325 in the length direction and the width direction of the flooded heat exchanger 101, and a wave pressing structure. The pressure wave structure serves to at least partially restrict the flow of the second medium in the first cavity 325 in the height direction of the flooded heat exchanger 101. Therefore, even in an oscillation environment such as a ship, the flooded heat exchanger 101 can keep the second medium in the first cavity 325 in the limited area of the shell 201, the wave blocking structure and the wave pressing structure, thereby ensuring that each heat exchange tube 311 can be kept immersed in the second medium and avoiding maldistribution of the second medium. Those skilled in the art will appreciate that in some embodiments, if the environmental oscillations are less pronounced or the housing has a limited height, only the wave blocking structure may be included, and not the pressure wave structure, the flow directing unit may not be completely immersed in the second medium.

Specifically, the wave blocking structure includes at least one shroud 328, and the heat exchange tubes 311 pass through at least a portion of the at least one shroud 328. In the present embodiment, the wave blocking structure includes a plurality of coamings 328, each coaming 328 including a portion extending in the length direction of the housing 201 and a portion extending in the width direction of the housing 201. The heat exchange tube 311 passes through a portion of the plurality of shroud plates 328 extending in the width direction of the casing 201. And a plurality of coamings 328 are connected to the inner sides of a pair of side walls 322 of the housing 201 at the outermost edges in the width direction of the housing 201 so that each of the flow guiding units 342 is fixedly connected to the housing 201. In the present embodiment, the plurality of coamings 328 are connected by welding to the inner sides of the pair of side walls 322 of the case 201 at the outermost edges in the width direction of the case 201. In other embodiments, the flow directing unit may be connected to the housing 201 in other ways; the deflector unit may also be connected to other parts of the housing 201, for example the deflector unit shroud 328 is connected to the bottom wall 323 of the housing 201. Thereby, the second medium accommodated in the first accommodation chamber 325 can be confined between the front wall of the housing 201 and the coaming 328 of each flow guiding unit 342, between the rear wall of the housing 201 and the coaming 328 of each flow guiding unit 342, or between the coaming 328 of each adjacent flow guiding unit 342 in the length direction of the housing 201. The second medium accommodated in the first accommodation chamber 325 can be confined between the pair of side walls 322 of the case 201 in the width direction of the case 201. Even if the unit is applied in an oscillating environment such that shaking of the flooded heat exchanger 101 in the length or width direction occurs, the second medium contained in the first containing chamber 325 is held between the housing 201 and the shroud 328 of each flow guiding unit 342 to at least partially restrict the flow of the second medium in the length and width directions of the flooded heat exchanger 101.

As further shown in fig. 3C and 3D, the shroud 328 of the bottommost flow guiding unit is recessed upward relative to the bottom wall 323 of the housing 201 to form a flow channel 324 for the second medium, and the flow channel 324 may allow the second medium to smoothly flow at least at the bottom of the first cavity 325. That is, although the second medium contained in the first chamber 325 is held in the defined area between the housing 201 and the shroud 328 of each flow directing unit 342, each defined area is in fluid communication with each other. This will help to form a liquid level 327 as the second medium flows into first chamber 325 or to drain from first chamber 325 as soon as possible.

Fig. 4 shows a perspective structural view of the plurality of flow guide units 342 and the heat exchange tube 311. As shown in fig. 4, a plurality of flow guiding units 342 are arranged in layers. In the present embodiment, the plurality of flow guiding units 342 are arranged in three layers, and in other embodiments, the plurality of flow guiding units 342 may be arranged in one layer, two layers or more layers. The bottom of each of the flow guiding units 342 of the lowermost layer is provided with a flow channel 324. The layered arrangement of the flow cells 342 helps to keep the second medium in a smaller area. The flow directing units 342 in each layer are disposed side by side substantially parallel in the length direction, and the flow directing units 342 in adjacent layers are disposed offset. Each heat exchange tube 311 passes through the respective flow directing units 342 in a layer in turn such that a length of each heat exchange tube 311 is located within a defined area of the flow directing unit 342 between the housing 201 and the shroud 328 of one flow directing unit 342 and in some cases between a number of the shroud 328.

Fig. 5A and 5B show the positional relationship of the plurality of flow guiding units 342. Wherein fig. 5A illustrates a layered, three-dimensional configuration of the plurality of flow directing units 342 and fig. 5B illustrates a side view of the plurality of flow directing units 342 illustrated in fig. 5A. As shown in fig. 5A and 5B, the plurality of flow guiding units 342 are arranged in three layers at the height of the housing 201, wherein the flow guiding units 342 in the odd layers are staggered from the flow guiding units 342 in the even layers. Specifically, each of the flow guiding units 342 includes a front side connection portion 463 and a rear side connection portion 464 in the length direction. In the present embodiment, each flow guiding unit 342 is approximatelyIn the zigzag structure, the middle portion of the flow guiding unit 342 in the width direction protrudes forward with respect to both sides. The front side connection portion 463 is located on the front side of the middle portion of the flow guiding unit 342 in the width direction, and the rear side connection portion 464 is located on the rear side of the middle portion of the flow guiding unit 342 in the width direction. A front connection 463 is formed at a front corner, and a rear connection 464 is formed at a rear corner. In the length direction, the flow guiding units 342 of two adjacent layers are not completely staggered, but partially overlapped, so as to facilitate connection between the flow guiding units 342. More specifically, the front connection portion 463 of each flow guiding unit 342 overlaps with the rear connection portion 464 of the adjacent flow guiding unit 342 in the adjacent layer to be combined or suspended, and the rear connection portion 464 overlaps with the front connection portion 463 of the adjacent flow guiding unit 342 in the adjacent layer to be combined or suspended, so that the staggered layer structure is formed. In the present embodiment, the combination of the front side connecting portion 463 and the rear side connecting portion 464 is achieved by means of welding. At the front side connection part 463 and the rear side connection part 464 of the corner part, the welding mode is combined, so that the combination of the flow guiding units 342 is more stable under the condition that the welding area of the flow guiding units 342 is limited. The suspension is due to the above-described offset arrangement, and the front side connecting portion 463 or the rear side connecting portion 464 of the front-most and rear-most flow guiding units 342 are suspended. For example, in the embodiment shown in FIGS. 5A and 5B,among the flow guiding units 342 of the second layer, the front side connecting portion 463 of the front-most flow guiding unit 342 is suspended, and among the flow guiding units 342 of the first and third layers, the rear side connecting portion 464 of the rear-most flow guiding unit 342 is suspended.

Fig. 6 is a perspective view of one embodiment of the flow guiding unit in fig. 5A, for illustrating a specific structure of the flow guiding unit 342. As shown in fig. 6, the plurality of coamings 328 of the deflector unit 342 includes a top plate 3021, a pair of wings 3023, and a pair of side plates 646. The top plate 3021 is located at the forefront side of the flow guiding unit 342 and extends in the width direction. A pair of side plates 646 are connected in parallel on opposite sides of the top plate 3021 and extend in the length direction. A pair of wings 3023 are connected side by side between the outside of the respective side plates 646 and the side wall 322 of the case 201, and extend in a direction parallel to the top plate 3021. That is, a pair of side plates 646 are formed extending rearward in the longitudinal direction from both side edges of the top plate 3021, and a pair of wing plates 3023 are formed extending widthwise from the rear side edges of the respective side plates 646. Accordingly, the corners of the junction of the top plate 3021 and the pair of side plates 646 are substantially rectangular, and the corners of the junction of the side plates 646 and the wing plates 3023 are substantially rectangular. Thus, five coamings 328 of the deflector unit 342 are generally formedA shape structure.

In this embodiment, the outer edge of each wing 3023 is attached to the side wall 322 of the housing 201 by a welding process. The top plate 3021 and the wing plate 3023 are provided with a plurality of holes 644 for the heat exchange tube 311 to pass through. Of course, the shroud 328 is not limited to this configuration, and for example, the deflector unit 342 may be configured to include only a top plate and a pair of side plates extending obliquely from the top plate for connection to the side walls of the housing, the top plate and side plates being perforated for passage of heat exchange tubes therethrough and the pair of side plates being connected to the side walls of the housing, etc., as appropriate. In this embodiment, the front side connection 463 is located on the top and bottom edges of the side panel 646 near the junction of the side panel 646 with the top panel 3021, and the rear side connection 464 is located on the top and bottom edges of the side panel 646 near the junction of the side panel 646 with the wing panel 3023. As will be appreciated by those skilled in the art, proximal herein means that the front side attachment 463 and the rear side attachment 464 are located on one side of the respective attachment points of the side panels 646 and have a length so as to have a range of overlap when joined with adjacent attachment points. Accordingly, the coaming 328 structure of the deflector unit 342 of the present application can facilitate the welding process.

As also shown in fig. 6, each flow directing unit 342 further includes a pressure wave structure disposed on a top side of at least one shroud 328 of each flow directing unit 342 and extending outwardly from a top edge of the corresponding shroud 328 at an angle oblique to the height direction to block flow of the second medium in the height direction that is confined within the defined area, thereby at least partially restricting flow of the second medium in the height direction of the flooded heat exchanger 101. In some embodiments, the wave pressing structure and the wave blocking structure may be integrally formed, or the wave pressing structure and the wave blocking structure may be fixedly connected together by welding or the like.

Specifically, the wave structure includes a plurality of platens 643. A plurality of pressure plates 643 are provided on top of all of the coamings 328 including a top plate 3021, a pair of side plates 646 and a pair of wings 3023. In other embodiments, however, a plurality of platens 643 may be provided on top of only one or more of the plurality of enclosures 328, as desired. In the embodiment shown in fig. 6, each of the pressing plates 643 is a planar structure extending in the horizontal direction, that is, each of the pressing plates 643 is perpendicular to the height direction. The lower surfaces of the pressing plates 643 are connected at intermediate positions of the top surfaces of the respective coamings 328 to give off corner portions at the junctions of the top plate 3021, the pair of side plates 646 and the pair of wing plates 3023, for example, the front side connecting portion 463 and the rear side connecting portion 464 are left free on the pair of side plates 646. And the pressing plates 643 horizontally extend to a certain width to both inner and outer sides of the corresponding shroud 328. The width is set so as to be able to block the flow of the second medium in the height direction within the defined area, but not to affect the flow of the steam.

In this embodiment, each of the flow guiding units 342 includes a pressure wave structure, and the flow guiding units 342 arranged in multiple layers can have better pressure wave effect than the flow guiding units 342 arranged in a single layer, so that the splashing height of the second medium is lower, and the amount of the splashed second medium is smaller. Even if the unit is applied in an oscillating environment such that shaking of the flooded heat exchanger 101 in the height direction occurs, the second medium in the defined area can be held between the housing 201 and the shroud 328 of each flow guiding unit 342 to restrict the flow of the second medium in the height direction.

Fig. 7 shows a perspective view of a second embodiment of the deflector unit. As shown in fig. 7, the structure of the flow guiding unit 742 is substantially the same as that of the flow guiding unit 342 of fig. 6, except that the structure of the pressure wave in the flow guiding unit 742 is different from that of the flow guiding unit 342. Specifically, in the present embodiment, the wave pressing structure includes a plurality of pressing plates 743. A plurality of pressure plates 743 are provided on top of all of the enclosures 328. Similarly, but in other embodiments, a plurality of platens 743 may be provided on top of only one or more of the plurality of enclosures 328, as the case may be, to yield a corner location where the enclosures 328 join. In the embodiment shown in fig. 7, each of the pressing plates 743 has a fold line-shaped structure. In this embodiment, the pressing plate 743 no longer extends in the horizontal direction, but extends slightly obliquely to the horizontal plane to form a fold line shape. And the pressure plate 743 is no longer attached to the top surface of each of the coamings 328, but extends from the side surface of the top of each of the coamings 328 to the opposite side. Thereby, the pressing plate 743 can also block the flow of the second medium in the height direction in the defined area.

Fig. 8 shows a perspective view of a third embodiment of the deflector unit. As shown in fig. 8, the structure of the flow guiding unit 842 is substantially the same as that of the flow guiding unit 742, except that the shape of the pressing plate 843 in the flow guiding unit 842 is different from that of the pressing plate 743 in the flow guiding unit 742. Specifically, in the present embodiment, each of the pressing plates 843 has a circular arc structure with a central portion arched to block the flow of the second medium in the height direction within the defined area.

It will be appreciated by those skilled in the art that the shape of the pressure plate is not limited to the several embodiments described above, as long as it can be conveniently attached to the top of the shroud 328 and extend from the top of the shroud 328 generally to both sides, for example, the pressure plate may be in a wave-like configuration.

In summary, since the wave blocking structure is provided in the flooded heat exchanger of the application, the second medium in the flooded heat exchanger can be limited in a smaller limited area range surrounded by the flow guiding unit and the shell, thereby limiting the flow of the second medium in the length direction and the width direction of the flooded heat exchanger. The pressure wave structure is further arranged in the flooded heat exchanger, so that the second medium in the flooded heat exchanger can be limited in a certain height range, and the flow of the second medium in the height direction of the flooded heat exchanger is limited.

Therefore, even if the unit using the flooded heat exchanger of the application is used in an oscillation environment such as a ship, the second medium can be kept immersed in each heat exchange tube, so that the second medium is not unevenly distributed in the flooded heat exchanger and a part of the heat exchange tubes are not exposed above the liquid level of the second medium, and the heat exchange efficiency is improved.

While the application has been disclosed in conjunction with the embodiments described above, various alternatives, modifications, variations, improvements, and/or substantial equivalents, whether known or that may be presently or later to be considered, will be apparent to those of ordinary skill in the art. In addition, technical effects and/or technical problems described in the present specification are exemplary and not limiting, so the disclosure of the present specification may be used to solve other technical problems and have other technical effects. Accordingly, the foregoing description of the embodiments of the application is intended to be illustrative rather than limiting. Various changes may be made without departing from the spirit or scope of the application. Accordingly, the present application is intended to embrace all known or earlier developed alternatives, modifications, variations, improvements and/or substantial equivalents.

Claims (11)

1. A flooded heat exchanger (101), comprising:

-a housing (201) having a first medium inlet (1011), a first medium outlet (1012), a second medium inlet (1013), a second medium outlet (1014), the housing (201) defining a first volume (325) and a second volume (326), the first volume (325) and the second volume (326) being in fluid communication with the second medium inlet (1013) and the second medium outlet (1014), wherein the first volume (325) is adapted to contain the second medium, the first volume (325) is arranged to be located below a liquid level (327) formed by the second medium, and the second volume (326) is arranged to be located above a liquid level (327) formed by the second medium;

-a plurality of heat exchange tubes (311), the heat exchange tubes (311) being arranged within the housing (201) in a length direction of the housing (201), the heat exchange tubes (311) being arranged within the first cavity (325), wherein both ends of the heat exchange tubes (311) are in fluid communication with the first medium inlet (1011) and the first medium outlet (1012), respectively, such that the heat exchange tubes (311) are adapted to accommodate the first medium;

a plurality of flow guiding units (342), wherein the plurality of flow guiding units (342) are arranged in the shell (201), and the plurality of flow guiding units (342) are arranged along the length direction of the shell (201);

wherein each of the flow directing units (342) comprises:

a wave blocking structure comprising at least one shroud (328), through at least a portion of which at least one shroud (328) the heat exchange tubes (311) pass, the at least one shroud (328) being arranged to confine the second medium contained in the first cavity (325) between the housing (201) and the shroud (328) of each flow guiding unit (342) to at least partially restrict the flow of the second medium in the length and width directions of the flooded heat exchanger (101).

2. The flooded heat exchanger (101) of claim 1, wherein:

each of the flow directing units (342) further comprises:

a pressure wave structure arranged on a top side of at least a part of the at least one shroud (328), the pressure wave structure being arranged to at least partially restrict a flow of the second medium in a height direction of the flooded heat exchanger (101).

3. The flooded heat exchanger (101) of claim 1, wherein:

the at least one shroud (328) comprises a top plate (3021), a pair of wings (3023) and a pair of side plates (646), the pair of side plates (646) being connected on opposite sides of the top plate (3021), the pair of wings (3023) being connected between the outside of the side plates (646) and the side walls (322) of the housing (201) such that a defined area for accommodating the second medium can be formed between the shroud (328) of adjacent wave-blocking structures or between the housing (201) and the shroud (328) of the wave-blocking structures;

a plurality of holes (644) are formed in the top plate (3021) and the wing plates (3023) for the heat exchange tube (311) to pass through.

4. The flooded heat exchanger (101) of claim 2, wherein:

the plurality of flow guiding units (342) are arranged in a plurality of layers on the height of the shell (201), wherein the flow guiding units (342) in the odd layers are staggered with the flow guiding units (342) in the even layers.

5. The flooded heat exchanger (101) of claim 4, wherein:

the wave blocking structure of each flow guiding unit (342) comprises a front side connecting part (463) and a rear side connecting part (464), wherein the front side connecting part (463) is positioned on the side plate (646) close to the joint of the side plate (646) and the top plate (3021), and the rear side connecting part (464) is positioned on the side plate (646) close to the joint of the side plate (646) and the wing plate (3023);

wherein the front side connecting part (463) of each flow guiding unit (342) is combined or suspended with the rear side connecting part (464) of the adjacent flow guiding unit (342) in the adjacent layer, and the rear side connecting part (464) thereof is combined or suspended with the front side connecting part (463) of the adjacent flow guiding unit (342) in the adjacent layer,

this is repeated to form a staggered layer structure.

6. The flooded heat exchanger (101) of claim 2, wherein:

the wave pressing structure and the wave blocking structure are integrally formed or welded together.

7. The flooded heat exchanger (101) of claim 2, wherein:

the wave pressing structure comprises pressing plates (643, 743, 843), wherein the lower surfaces of the pressing plates (643, 743, 843) are connected to the top of the coaming (328) and extend to the inner side and the outer side of the corresponding coaming (328) to block the flow of the second medium in the limited area in the height direction.

8. The flooded heat exchanger (101) of claim 2, wherein:

the wave pressing structure comprises pressing plates (643, 743, 843), the sides of the pressing plates (643, 743, 843) being connected to both sides of the top of the shroud (328) and extending from one side of the respective shroud (328) to the other side to block the flow of the second medium in the height direction within the defined area.

9. The flooded heat exchanger (101) of claim 7 or 8, wherein:

the pressing plates (643, 743, 843) are in a plane structure, a circular arc structure, a wave structure or a fold line structure.

10. The flooded heat exchanger (101) of claim 4, wherein,

the flow guiding unit (342) of the lowermost one of the plurality of layers is provided at the bottom thereof with a flow channel (324) through which the second medium flows.

11. The utility model provides a marine lithium bromide refrigerating unit which characterized in that: comprising the following steps: an evaporator (102), an absorber (103), a condenser (104), a heat exchanger (105), a solution circulation pump (106), and a generator;

wherein the generator comprises a flooded heat exchanger (101) according to any of claims 1-10.