CN218821117U - Flooded evaporator - Google Patents

Abstract

The utility model provides a flooded evaporator, which comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the shell, and an inner cavity which is positioned in the shell and is filled with a refrigerant is formed by the shell, the first end cover and the second end cover; a plurality of heat exchange tubes for connecting the first end cover and the second end cover are arranged in the inner cavity; the first end cover and the second end cover are respectively provided with two separated mixed flow chambers; one mixing chamber on the first end cover is communicated with one mixing chamber on the second end cover through a plurality of heat exchange tubes for a first heat exchange medium to flow, and the rest mixing chambers on the first end cover are communicated with the rest mixing chambers on the second end cover through other heat exchange tubes for a second heat exchange medium to flow. The flooded evaporator is provided with two groups of mutually independent heat exchange medium passages in the same heat exchange cavity, so that the integrated heat exchange from two paths of heat source loops can be realized simultaneously, and the flooded evaporator is particularly suitable for an integrated heat supply system of a large project adopting various heat sources for heat supply.

Description

Flooded evaporator

Technical Field

The utility model relates to a heat exchanger technical field, concretely relates to flooded evaporator.

Background

Flooded evaporators are widely used in refrigeration systems because of their high heat transfer efficiency. However, the existing flooded evaporator adopts two media for heat exchange, and mostly only adopts one heat exchange medium and one refrigerant. The refrigerant is evaporated in the shell pass of the evaporator, and the tube pass is communicated with another heat exchange medium. I.e. only for one circulation circuit of the heat exchange medium, and thus it can only be used for heat exchange of a single heat exchange system. When the system is applied to a combined heat and power heat pump system for central heating, the tube pass heat exchange medium is power plant heat source water, and heat of the power plant heat source water is extracted to a heat supply end through refrigeration cycle, so that the use requirement can be met only by a circulation loop of one heat exchange medium.

In order to achieve the effects of energy conservation and emission reduction, the existing heating system adopts a large number of multi-heat-source heating system designs under the condition of permission, so that heat exchange needs to be carried out among a plurality of heat sources. Aiming at double-heat-source heat supply, particularly cogeneration and urban waste heat double-heat-source heat supply scenes, the flooded evaporator for the single heat exchange medium loop cannot meet the use requirement because two groups of independent heat exchange loops are involved and isolated from each other.

SUMMERY OF THE UTILITY MODEL

To the problem that current flooded evaporator can not directly be arranged in the heat transfer system of a plurality of heat source heats, the utility model provides a flooded evaporator.

The technical scheme of the utility model provides a flooded evaporator, which comprises a shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the shell;

a plurality of heat exchange tubes for connecting the first end cover and the second end cover are arranged in the inner cavity;

the first end cover and the second end cover are respectively provided with two flow mixing chambers which are isolated from each other; one mixing chamber on the first end cover is communicated with one mixing chamber on the second end cover through a plurality of heat exchange tubes for a first heat exchange medium to flow, and the rest mixing chambers on the first end cover are communicated with the rest mixing chambers on the second end cover through other heat exchange tubes for a second heat exchange medium to flow.

Preferably, the first end cover is provided with a first mixed flow chamber and a second mixed flow chamber, the second end cover is provided with a third mixed flow chamber and a fourth mixed flow chamber, and the third mixed flow chamber is communicated with the first mixed flow chamber through a heat exchange pipe and used for heat exchange of a loop where the first heat exchange medium is located; the second mixed flow chamber and the fourth mixed flow chamber are communicated through other heat exchange pipes and are used for heat exchange of a loop where the second heat exchange medium is located.

Preferably, a first medium inlet is arranged on the first mixing chamber, a first medium outlet is arranged on the third mixing chamber, a second medium inlet is arranged on the second mixing chamber, and a second medium outlet is arranged on the fourth mixing chamber.

Preferably, a first medium inlet mixed flow region and a first medium outlet mixed flow region are isolated from one of the first mixed flow chamber and the third mixed flow chamber, a first medium inlet is formed in the first medium inlet mixed flow region, and a first medium outlet is formed in the first medium outlet mixed flow region;

and a second medium inlet mixed flow region and a second medium outlet mixed flow region are isolated from one of the second mixed flow chamber or the fourth mixed flow chamber, a second medium inlet is formed in the second medium inlet mixed flow region, and a second medium outlet is formed in the second medium outlet mixed flow region.

Preferably, the first mixing chamber and the second mixing chamber are separated by a first partition plate, and the third mixing chamber and the fourth mixing chamber are separated by a second partition plate; the first partition plate and the second partition plate are arranged along the vertical direction.

Preferably, the first partition and the second partition have the same position in the horizontal direction on a projection plane perpendicular to the axial direction of the housing.

Preferably, the bottom of the shell is provided with a refrigerant inlet, the upper part of the shell is provided with a refrigerant outlet, and an axially extending uniform flow pore plate is laid above the refrigerant inlet in the inner cavity to ensure that the refrigerant flowing out of the refrigerant inlet is uniformly distributed.

The utility model discloses a flooded evaporator has set up two sets of independent heat transfer medium passageways each other in same heat transfer intracavity, consequently can realize simultaneously from two way heat source return circuits integrated heat transfer, is particularly useful for in the integrated heating system of the big project that has adopted multiple heat source heat supply. The use of the flooded evaporator can avoid the problems of occupation of the field, increase of equipment and increase of system complexity caused by the design of the independent evaporator for each heat exchange loop in the integrated heat supply system.

Drawings

Fig. 1 is a schematic view of a flooded evaporator of the present invention;

fig. 2 is a schematic structural view of embodiment 1 of a flooded evaporator of the present invention;

fig. 3 is a schematic flow diagram of embodiment 1 of a flooded evaporator of the present invention;

fig. 4 is a schematic structural view of embodiment 2 of the flooded evaporator of the present invention;

fig. 5 is a schematic flow diagram of embodiment 2 of a flooded evaporator of the present invention;

fig. 6 is a schematic layout view of the first partition plate of the flooded evaporator of the present invention.

In the figure, the position of the upper end of the main shaft,

1: a shell 11, an inner cavity 12, a refrigerant inlet 13, a uniform flow pore plate 14, a refrigerant outlet 2, a first end cover 3, a second end cover 21, a first mixed flow chamber 22, a second mixed flow chamber 31, a third mixed flow chamber 32, a fourth mixed flow chamber A, a first heat exchange medium B, a second heat exchange medium C, a refrigerant 23, a first medium inlet 24, a second medium inlet 33, a first medium outlet 34, a second medium outlet 88, a first medium inlet mixed flow area 89, a first medium outlet mixed flow area 98, a second medium inlet mixed flow area 99, a second medium outlet mixed flow area 25, a first partition plate 35, a second partition plate 4, a heat exchange tube

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, wherein the dimensional ratios in the drawings do not represent actual dimensional ratios, and are only used for representing relative positional relationships and connection relationships between components, and the components with the same names or the same reference numbers represent similar or identical structures and are only used for illustrative purposes.

Fig. 1 is a schematic structural view of a flooded evaporator of the present invention. The flooded evaporator comprises a shell 1, and a first end cover 2 and a second end cover 3 which are respectively arranged at two ends of the shell 1, wherein an inner cavity 11 which is positioned in the shell 1 and contains refrigerant C is formed by the shell 1, the first end cover 2 and the second end cover 3. A plurality of heat exchange tubes 4 connecting the first end cap 2 and the second end cap 3 are arranged in the inner cavity 11. The first end cap 2 and the second end cap 3 are respectively provided with two separated mixing chambers. One mixing chamber on the first end cover 2 is communicated with one mixing chamber on the second end cover 3 through a plurality of heat exchange tubes 4, the mixing chambers are connected into a loop where a first heat exchange medium A is located, the first heat exchange medium A flows through the loop, and the first heat exchange medium A exchanges heat in the heat exchange tubes 4. The rest mixing chamber on the first end cover 2 is communicated with the rest mixing chamber on the second end cover 3 through another heat exchange tube 4, the mixing chamber is connected to a loop where a second heat exchange medium B is located, the second heat exchange medium B flows through the loop, and the second heat exchange medium B exchanges heat in the heat exchange tube 4. . Specifically, as shown in the schematic diagram of fig. 2, the first end cap 2 is provided with a first mixing chamber 21 and a second mixing chamber 22, the second end cap 3 is provided with a third mixing chamber 31 and a fourth mixing chamber 32, the third mixing chamber 31 is communicated with the first mixing chamber 21 through a heat exchange tube 4 for heat exchange of a loop in which the first heat exchange medium a is located, and the second mixing chamber 22 is communicated with the fourth mixing chamber 32 through another heat exchange tube 4 for heat exchange of a loop in which the second heat exchange medium B is located. It should be noted that the first heat exchange medium a and the second heat exchange medium B belong to different heat exchange loops, and are not related to their components, so that the first heat exchange medium a and the second heat exchange medium B may be the same material.

When in use, in the loop of the first heat exchange medium A, the first heat exchange medium A flows in the heat exchange tube 4 through the first mixed flow chamber 21 and the third mixed flow chamber 31; similarly, in the loop of the second heat exchange medium B, the second heat exchange medium B flows in the heat exchange tubes 4 through the second mixed flow chamber 22 and the fourth mixed flow chamber 32. The refrigerant C absorbs the heat of the medium in the heat exchange tubes 4 in the shell 1 and evaporates, so that the heat is transferred from the first heat exchange medium A and the second heat exchange medium B to the refrigerant C. The heat transfer from the two heat exchange circuits to the same refrigerant circuit is integrated. In practical application, in an application scenario of dual-heat-source integrated heat supply, the first mixing chamber 21 and the third mixing chamber 31 are connected to a heat exchange loop of a first heat source, the second mixing chamber 22 and the fourth mixing chamber 32 are connected to a heat exchange loop of a second heat source, the inner cavity 11 is connected to a heat collection loop using a refrigerant, and heat is conveyed to a heat supply end after other processing. In practical cases, the heat exchange loop of the first heat source and the heat exchange loop of the second heat source are independent of each other, so that the first heat exchange medium a and the second heat exchange medium B are used for distinguishing the heat exchange media therein. However, the same material, usually water, can be used for the first heat exchange medium a and the second heat exchange medium B.

There are many arrangements of flooded evaporators. One such configuration is shown in figure 2. The first medium inlet 23 is arranged on the first mixing chamber 21, the first medium outlet 33 is arranged on the third mixing chamber 31, and the heat exchange tube 4 is connected into the heat exchange loop in which the first heat exchange medium A is arranged through the first medium inlet 23 and the first medium outlet 33. As shown by the solid flow in the schematic diagram of fig. 3, the first media inlet 23 and the second media outlet 34 are respectively blocked in the front view, and therefore placed in brackets, and thebase:Sub>A-base:Sub>A view and the B-B view show the details of the first end cap 2 and the second end cap 3. The first heat exchange medium A flows into the third mixed flow chamber 31 from the first mixed flow chamber 21 through the heat exchange tube 4, and heat is transferred to the inner cavity 11 in the heat exchange tube 4 to realize heat exchange of the heat exchange loop in which the first heat exchange medium A is positioned. Similarly, a second medium inlet 24 is arranged on the second mixing chamber 22, a second medium outlet 34 is arranged on the fourth mixing chamber 32, and the heat exchange tube 4 is connected into a heat exchange loop in which a second heat exchange medium B is located through the second medium inlet 24 and the second medium outlet 34, wherein the flow direction of the second heat exchange medium B is shown by a dotted line in fig. 3.

Fig. 4 shows a flooded evaporator of another arrangement. A first medium inlet mixed flow area 88 and a first medium outlet mixed flow area 89 are separated from one of the first mixed flow chamber 21 or the third mixed flow chamber 31, a first medium inlet 23 is formed in the first medium inlet mixed flow area 88, a first medium outlet 33 is formed in the first medium outlet mixed flow area 89, and the first heat exchange medium A flows back to the first medium outlet mixed flow area 89 from the first medium inlet mixed flow area 88 in a reciprocating mode through the heat exchange tubes 4. A second medium inlet mixed flow region 98 and a second medium outlet mixed flow region 99 are separated from one of the second mixed flow chamber 22 and the fourth mixed flow chamber 32, a second medium inlet 24 is formed on the second medium inlet mixed flow region 98, a second medium outlet 34 is formed on the second medium outlet mixed flow region 99, and then the second heat exchange medium B flows back to the second medium outlet mixed flow region 99 from the second medium inlet mixed flow region 98 through the heat exchange tubes 4. Fig. 5 shows a schematic flow direction diagram of a flooded evaporator in this arrangement, wherein the solid line is the flow direction of the first heat exchange medium a and the dashed line is the flow direction of the second heat exchange medium B. In contrast to the above arrangement, in which the first medium inlet 23, the second medium inlet 24, the first medium outlet 33 and the second medium outlet 34 are all arranged at one end of the housing 1, it is more advantageous in terms of piping arrangement, i.e. a flooded evaporator can be arranged in a specific working space, while the lines of the two heat exchange circuits are arranged centrally through a single area. It should be noted that there is no difference in the flow of the heat exchange medium between the second medium inlet mixed flow region 98 and the second medium outlet mixed flow region 99, and between the first medium inlet mixed flow region 88 and the first medium outlet mixed flow region 89, and therefore the above flow direction is also the reverse. This means that the solution is not strictly limited by the reference signs "inlet" or "outlet", and the solution of the inlet and outlet exchange design is also within the scope of the present application, both from the point of view of symmetry of the solution design and from the point of view of the fact that the above-mentioned flow process can be reversed for the skilled person.

In particular to the structure of the first end cap 2 and the second end cap 3, in the case of a single heat exchange circuit, the first end cap 2 and the second end cap 3 pass through a mixed flow chamber having a single circular cross section connecting the heat exchange tubes 4, and on the basis of this, a first mixed flow chamber 21 and a second mixed flow chamber 22 on the first end cap 2 of the flooded evaporator can be divided by a first partition plate 25. Similarly, the third mixing chamber 31 and the fourth mixing chamber 32 are partitioned by a second partition 35. The first partition plate 25 and the second partition plate 35 can be welded in the original mixing chamber when the first end cap 2 and the second end cap 3 are welded. It will be appreciated that the first media inlet flow mixing region 88 may be separated from the first media outlet flow mixing region 89, and the second media inlet flow mixing region 98 may be separated from the second media outlet flow mixing region 99 in a similar manner.

Since the refrigerant C in the casing 1 is not completely filled, it is necessary to leave a suitable evaporation space above the liquid surface. And all the heat exchange tubes 4 should be immersed in the refrigerant C for the best heat exchange effect, so the heat exchange tubes 4 are not generally disposed vertically symmetrically in the shell 1, but are not disposed above the liquid surface. Correspondingly, in order to facilitate the separation and control of the heat exchange effect of the two heat exchange circuits, the first partition plate 25 and the second partition plate 35 are preferably arranged along the vertical direction, as shown in fig. 6, so that the expectation of the heat exchange effect of the heat exchange tubes 4 belonging to different heat exchange circuits can be ensured. And obviously, since the heat exchange tubes 4 are installed along the axial direction of the shell 1, in order to ensure the correspondence of the communication between the first mixing chamber 21 and the third mixing chamber 31, and the communication between the second mixing chamber 22 and the fourth mixing chamber 32, on the projection plane perpendicular to the axial direction of the shell 1, the positions of the first partition plate 25 and the second partition plate 35 in the horizontal direction should be the same. At the beginning of the design of the flooded evaporator, the power of the heat source used by different heat exchange loops can be surveyed and evaluated to determine the horizontal positions of the first partition plate 25 and the second partition plate 35 on the first end cover 2 and the second end cover 3 so as to obtain the quantity proportion of the heat exchange tubes 4 connected into different heat exchange loops, thereby balancing the heat exchange effect of different heat exchange loops according to the power of the heat source.

The bottom of the shell 1 is provided with a refrigerant inlet 12, an axially extending uniform flow pore plate 13 is laid above the refrigerant inlet 12 in the inner cavity 11, the liquid level of the refrigerant C in the inner cavity 11 is maintained at a certain height, an evaporation space of the refrigerant C is reserved above the liquid level, a refrigerant outlet 14 is arranged above the shell 1, and the evaporated refrigerant C flows out from the refrigerant outlet 14. All the heat exchange tubes 4 are immersed in the liquid refrigerant, and the heat exchange efficiency is fully improved. The uniform flow pore plate 13 is a plate-shaped object which is provided with a large number of through holes and extends at the bottom of the inner cavity 11, after the refrigerant C enters the inner cavity 11 through the refrigerant inlet 12, the refrigerant C is equalized through the uniform flow pore plate 13, the local flow velocity is reduced, and the refrigerant C uniformly flows into all axial parts of the inner cavity 11, so that the temperature of the refrigerant C in the inner cavity 11 is prevented from being uneven, and the heat exchange effect is prevented from being influenced.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (7)

1. A flooded evaporator is characterized by comprising a shell (1), a first end cover (2) and a second end cover (3) which are respectively arranged at two ends of the shell (1), wherein an inner cavity (11) which is positioned in the shell (1) and is filled with a refrigerant (C) is formed by the shell (1), the first end cover (2) and the second end cover (3);

a plurality of heat exchange tubes (4) for connecting the first end cover (2) and the second end cover (3) are arranged in the inner cavity (11);

the first end cover (2) and the second end cover (3) are respectively provided with two separated mixed flow chambers; one mixing chamber on the first end cover (2) is communicated with one mixing chamber on the second end cover (3) through a plurality of heat exchange tubes (4) for a first heat exchange medium (A) to flow, and the rest mixing chambers on the first end cover (2) are communicated with the rest mixing chambers on the second end cover (3) through other heat exchange tubes (4) for a second heat exchange medium (B) to flow.

2. The flooded-type evaporator of claim 1, characterized in that the first end cover (2) is provided with a first mixing chamber (21) and a second mixing chamber (22), the second end cover (3) is provided with a third mixing chamber (31) and a fourth mixing chamber (32), and the third mixing chamber (31) is communicated with the first mixing chamber (21) through a heat exchange tube (4) for heat exchange of a loop in which the first heat exchange medium (A) is located; the second mixed flow chamber (22) is communicated with the fourth mixed flow chamber (32) through another heat exchange pipe (4) and is used for heat exchange of a loop where the second heat exchange medium (B) is located.

3. A flooded-type evaporator as claimed in claim 2, characterized in that a first medium inlet (23) is provided in the first mixing chamber (21), a first medium outlet (33) is provided in the third mixing chamber (31), a second medium inlet (24) is provided in the second mixing chamber (22), and a second medium outlet (34) is provided in the fourth mixing chamber (32).

4. A flooded-type evaporator as claimed in claim 2, characterized in that a first medium inlet mixed flow region (88) and a first medium outlet mixed flow region (89) are isolated in one of the first mixed flow chamber (21) or the third mixed flow chamber (31), a first medium inlet (23) is provided in the first medium inlet mixed flow region (88), and a first medium outlet (33) is provided in the first medium outlet mixed flow region (89);

a second medium inlet mixed flow area (98) and a second medium outlet mixed flow area (99) are separated from one of the second mixed flow chamber (22) or the fourth mixed flow chamber (32), a second medium inlet (24) is formed in the second medium inlet mixed flow area (98), and a second medium outlet (34) is formed in the second medium outlet mixed flow area (99).

5. A flooded-type evaporator as claimed in claim 2, characterized in that the first (21) and the second (22) mixing chamber are separated by a first partition (25), and the third (31) and the fourth (32) mixing chamber are separated by a second partition (35); the first partition plate (25) and the second partition plate (35) are arranged along the vertical direction.

6. A flooded-type evaporator as claimed in claim 5, characterised in that the first partition (25) and the second partition (35) have the same position in the horizontal direction on a projection plane perpendicular to the axial direction of the shell (1).

7. The flooded evaporator of claim 1, wherein a refrigerant inlet (12) is formed in the bottom of the shell (1), a refrigerant outlet (14) is formed above the shell (1), and an axially extending uniform flow orifice plate (13) is laid above the refrigerant inlet (12) in the inner cavity (11) to uniformly distribute the refrigerant (C) flowing out from the refrigerant inlet (12).

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