CN109945694A - Anti-corrosion heat exchanger and heat pump system - Google Patents

Abstract

The invention discloses a kind of corrosion-proof heat exchanger and heat pump system, corrosion-proof heat exchanger include for refrigerant the steel wherein to circulate shell, more be intervally arranged in the shell and supply water circulate wherein with refrigerant carry out heat exchange titanium heat exchanger tube, be mounted on shell at least one end for the composite plate of shell seal；Composite plate includes by the opposite steel plate being complex as a whole of explosive welding and titanium plate；The connecting hole that heat exchanger tube is equipped with perforation to steel plate is corresponded in titanium plate；Steel plate is towards shell and is sealedly connected on the port of shell；The both ends of heat exchanger tube are a tight fit in respectively in the connecting hole of composite plate, are connect with titanium plate.Corrosion-proof heat exchanger of the invention, it is realized the composite plate made of titanium plate and steel plate and is connected to form one structure with the shell of heat exchanger and titanium heat exchanger, can used in high chloride ion environment, be suitable for the heat exchange of seawater and fresh water and refrigerant, long service life and stabilization reduce maintenance cost.

Description

Anti-corrosion heat exchanger and heat pump system

technical field

The invention relates to the technical field of heat exchange, in particular to an anticorrosion heat exchanger and a heat pump system.

Background technique

The water surface of indoor swimming pool will evaporate a lot of water vapor, which needs to be dehumidified in time, otherwise it will corrode the decoration and building structure. At present, most of them adopt the principle of compression cycle refrigeration for cooling and dehumidification. However, a lot of heat is released during the cooling and dehumidification process. How to recover the released heat to the pool water is a problem brought by dehumidification.

In the compression cycle refrigeration, the single-stage vapor compression refrigeration system is composed of four basic components: a refrigeration compressor, a condenser, an evaporator and a throttle valve, which are connected in turn by pipes to form a closed system. There is continuous circulation in the system, state changes occur, and heat is exchanged with the outside world. After the liquid refrigerant absorbs the heat of the object to be cooled in the evaporator, it is vaporized into low-temperature and low-pressure steam, sucked by the compressor, compressed into high-pressure and high-temperature steam, and then discharged into the condenser. ) to release heat, condensed into high-pressure liquid, throttled by the throttle valve to low-pressure and low-temperature refrigerant, and then entered the evaporator again to absorb heat and vaporize to achieve the purpose of circulating refrigeration. In this way, the refrigerant goes through four basic processes of evaporation, compression, condensation and throttling in the system to complete a refrigeration cycle.

In the refrigeration system, the evaporator, the condenser, the compressor and the throttle valve are the four essential parts in the refrigeration system. Among them, the evaporator is a device that conveys cold energy, and the refrigerant absorbs the heat of the object to be cooled. achieve refrigeration. The compressor is the heart and plays the role of inhaling, compressing and transporting the refrigerant vapor. The condenser is a device that emits heat, and transfers the heat absorbed in the evaporator together with the heat converted by the compressor work to the cooling medium to take away.

Condenser is a type of heat exchanger. It is a device that cools or condenses the high-temperature and high-pressure medium discharged from the process section into liquid and releases heat to the outside. It is one of the key devices in the refrigeration system. Commonly used cooling media are water and air. According to the different cooling (condensing) medium and heat exchange mechanism, it can be divided into air-cooled, water-cooled and evaporative. According to the shape and structure of the heat transfer surface, it can be divided into tube type, plate type and other structures.

The materials of the condenser (heat exchanger) are generally mainly carbon steel, stainless steel and copper. When the carbon steel tube sheet is used as a cooler, the welding seam between the tube sheet and the tube is often corroded and leaked. Entering the cooling water system will pollute the environment and waste materials. When in use, the tube sheet part is in contact with industrial cooling water, and impurities, salts, gases and microorganisms in the industrial cooling water will cause corrosion to the tube sheet and welds. Studies have shown that industrial water, whether it is fresh water or sea water, will have various ions and dissolved oxygen, among which the concentration of chloride ions and oxygen changes, which play an important role in the corrosion of metals.

Therefore, it is necessary to develop a heat exchanger suitable for seawater and freshwater, which can be used in a high chloride ion environment.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an anti-corrosion heat exchanger and a heat pump system that are suitable for seawater and fresh water and can be used in a high chloride ion environment.

The technical solution adopted by the present invention to solve the technical problem is to provide an anti-corrosion heat exchanger, which includes a steel casing for the refrigerant to circulate in it, a plurality of pipes are arranged in the casing at intervals, and the water is circulated in the casing so as to a titanium heat exchange tube for exchanging heat with the refrigerant, and a composite plate installed on at least one end of the outer shell to seal the outer shell;

The composite plate includes a steel plate and a titanium plate that are relatively integrated by explosive welding; the titanium plate is provided with a connecting hole penetrating through the steel plate corresponding to the heat exchange tube;

The steel plate faces the outer shell and is sealedly connected to the port of the outer shell; the two ends of the heat exchange tube are respectively tightly fitted in the connecting holes of the composite plate and connected to the titanium plate.

Preferably, the anti-corrosion heat exchanger further comprises a first end cover disposed at the end of the outer shell and connected with the composite plate;

The first end cover is provided with a water inlet and a water outlet; the water inlet, the heat exchange tube and the outlet are connected with each other to form a water flow channel through which the water supply circulates in and out and exchanges heat with the refrigerant.

Preferably, the anti-corrosion heat exchanger includes two of the composite plates, and the two composite plates are respectively arranged at opposite ends of the outer shell; the two ends of the heat exchange tube are tightly fitted on the two In the connecting hole of the composite plate, it is connected with the titanium plate;

The anti-corrosion heat exchanger further includes a second end cover, the first end cover and the second end cover are respectively arranged at two ends of the outer shell and are respectively connected with the corresponding composite plates;

The inner space of the second end cover is communicated with the heat exchange tube to form a water flow turning space in which the water flows out of the heat exchange tube and then flows back into the heat exchange tube.

Preferably, a first partition assembly is arranged between the first end cover and the corresponding composite plate, and the inner space of the first end cover is at least divided into a water inlet end communicating with the water inlet, and a water inlet end communicating with the water inlet port. a water outlet connected with the water outlet;

A second partition assembly is arranged between the second end cover and the corresponding composite plate, and separates the water flow turning space in the second end cover into at least two water flow turning parts.

Preferably, the first partition assembly includes a first partition plate and a second partition plate, the first partition plate and the second partition plate are arranged at intervals and the plurality of connection holes on the corresponding composite plate are divided into three groups , which are the first group of connection holes, the second group of connection holes and the third group of connection holes;

The first partition is arranged around the water inlet and the corresponding first group of connection holes, so that the water inlet and the first group of connection holes are connected to form the water inlet;

The second partition is arranged around the water outlet and the corresponding second group of connection holes, so that the water outlet and the second group of connection holes are connected to form the water outlet;

The third group of connection holes located between the first baffle and the second baffle communicate with the inner space of the corresponding first end cover to form a back-and-forth part isolated from the water inlet end and the water outlet end;

After the water enters the heat exchange tube connected with the first group of connection holes from the water inlet end, it flows into the heat exchange tube connected with the third group of connection holes through a water flow turnback part of the second end cover. In the reciprocating part, the other water flow return part that flows back to the second end cover is turned back, and then flows back from the other water flow return part and flows into the heat exchange tube connected with the second group of connection holes, and flows out of the water flow through the water outlet end. first end cap.

Preferably, the second partition assembly includes a third partition plate that divides the plurality of connection holes on the corresponding composite plate into a first group of connection holes and a second group of connection holes;

Part of the connection holes of the first group of connection holes are relatively coincident with the first group of connection holes in the water inlet, and another part of the connection holes are relatively coincident with the part of the connection holes of the third group of connection holes in the reciprocating part;

Part of the connection holes of the second group of connection holes overlap with another part of the connection holes of the third group of connection holes in the reciprocating part, and the connection holes of the other part overlap with the second group of connection holes in the water outlet.

Preferably, the third partition plate comprises a V-shaped plate and two end plates respectively connected to both ends of the V-shaped plate;

The half side of the V-shaped plate and the connected one end plate are relatively overlapped with the part of the first partition plate, and the other end plate is relatively overlapped with the part of the second partition plate.

Preferably, the anti-corrosion heat exchanger further comprises a first sealing ring sealed between the first end cap and the corresponding composite plate, a second sealing ring sealed between the second end cap and the corresponding composite plate sealing ring;

The first sealing ring is provided with a first sealing rib corresponding to the first partition component; the second sealing ring is provided with a second sealing rib corresponding to the second partition component.

Preferably, the first end cover comprises a first cylinder cover with one end closed, a first end plate connected to the open end of the first cylinder cover and matched with the corresponding composite plate; the water inlet and a water outlet is provided on the closed end of the first cylinder cover.

Preferably, the second end cover comprises a second cylinder cover with one end closed, and a second end plate connected to the open end of the second cylinder cover and matched with the corresponding composite plate.

Preferably, the side of the casing is provided with a refrigerant inlet and a refrigerant outlet respectively used for the in and out of the refrigerant.

The present invention also provides a heat pump system, including a condenser, wherein the condenser includes at least one anticorrosion heat exchanger according to any one of the above.

The anti-corrosion heat exchanger of the present invention is connected with the shell of the heat exchanger and the titanium heat exchanger to form an integrated structure through the composite plate made of titanium plate and steel plate, can be used in a high chloride ion environment, and is suitable for seawater and The heat exchange between fresh water and refrigerant has a long and stable service life, reducing maintenance costs.

The anti-corrosion heat exchanger of the present invention is applied to a heat pump system, suitable for cooling and dehumidifying an indoor swimming pool, and at the same time, the heat generated is exchanged with the pool water to realize heat recovery and utilization.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic three-dimensional structure diagram of an anti-corrosion heat exchanger according to an embodiment of the present invention;

2 is a partial cross-sectional structural schematic diagram of an anti-corrosion heat exchanger according to an embodiment of the present invention;

3 is an exploded schematic diagram of the end structure of the anti-corrosion heat exchanger according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of the anti-corrosion heat exchanger shown in FIG. 3 in another direction;

FIG. 5 is a schematic view of the cross-sectional structure of the anti-corrosion heat exchanger shown in FIG. 2 along the A-A direction;

FIG. 6 is a schematic cross-sectional structure diagram of the anti-corrosion heat exchanger shown in FIG. 2 along B-B;

7 is a schematic structural diagram of a condenser in a heat pump system according to an embodiment of the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2 , an anti-corrosion heat exchanger 100 according to an embodiment of the present invention includes a casing 10 , a plurality of heat exchange tubes 20 and at least one composite plate 30 . The composite board 30 is installed on at least one end of the casing 10 to seal the casing 10 . A plurality of heat exchange tubes 20 are arranged in the casing 10 at intervals, and the two ends of the tubes are respectively penetrated and connected to the composite plate 30 . The inside of the casing 10 is used for the refrigerant to circulate therein, and the water inside the heat exchange tube 20 circulates therein to exchange heat with the refrigerant.

Among them, the shell 10 is made of seamless welded steel pipes, which can withstand higher operating pressures than conventional PVC shells, and can be used for high water temperature heat exchange. The housing 10 is provided with a refrigerant inlet 11 and a refrigerant outlet 12, which are respectively used for the in and out of the refrigerant. Preferably, the refrigerant inlet 11 and the refrigerant outlet 12 are disposed on opposite ends of the casing 10, and face different directions, for example, one faces upwards and the other faces downwards.

The heat exchange tube 20 is made of titanium tube, which has the advantages of light weight, superior mechanical properties, and strong corrosion resistance. Therefore, the heat exchange tube 20 can be used for seawater or fresh water to circulate and conduct heat exchange.

In this embodiment, the casing 10 is a steel pipe with open ends, and the composite plate 30 is provided with two two ends which are respectively fitted at the two ends of the casing 10 to close the two ports of the casing 10 .

Each of the composite plates 30 includes a steel plate 31 and a titanium plate 32 that are relatively compositely connected as a whole. The steel plate 31 and the titanium plate 32 are welded by explosive welding to form a whole, and the structure is stable. Among them, the steel plate 31 is used for connecting with the shell 10, and the titanium plate 32 is used for connecting the heat exchange tube 20, and the same metal is used for connection, which has good compatibility and stable structure after connection.

The two composite plates 30 are respectively disposed at opposite ends of the casing 10 , and both face the casing 10 with the steel plates 31 . The steel plate 31 is sealingly connected with the port of the casing 10 , so as to close the port of the casing 10 ; the titanium plate 32 is located on the side of the steel plate 31 facing away from the casing 10 . The shape of the composite plate 30 can be various shapes such as polygon and circle, and the peripheral dimension is larger than the diameter of the port of the casing 10 , so that it can fit in the port of the casing 10 and close the port.

Referring to FIGS. 2 and 3 , the titanium plate 32 is provided with a connecting hole 33 penetrating through the steel plate 31 corresponding to the heat exchange tube 20 . The heat exchange tube 20 is passed through the casing 10 , and the two ends thereof are tightly fitted in the connecting holes 33 of the two composite plates 30 respectively, and are connected to the titanium plate 32 . Specifically, one end of the heat exchange tube 20 penetrates into the composite plate 30 through the connecting hole 33, passes through the steel plate 31 along the connecting hole 33 to reach the titanium plate 32, and is connected to the titanium plate 32 by welding or the like, so that the heat exchange tube The ends of 20 are fastened in titanium plate 32 .

The two ends of the heat exchange tube 20 may be provided with external threads, and the connection holes 33 of the composite plate 30 may be provided with internal threads, so that the ends of the heat exchange tubes 20 may be fastened in the connection holes 33 by threads. To avoid liquid leakage, the end of the heat exchange tube 20 and the connection hole 33 may be further sealed by welding.

In addition, the entire axial side surface of the heat exchange tube 20 can also be provided with external threads, which increases the heat exchange area of the heat exchange tube 20, and its heat exchange coefficient can be 1.5-2.4 times that of a heat exchange tube with a smooth surface of the same specification.

Further, as shown in FIGS. 1 and 2 , the anti-corrosion heat exchanger 100 of the present invention further includes a first end cover 40 and a second end cover 50 respectively disposed at both ends of the outer shell 10 and connected with the two composite plates 30 . The first end cap 40 and the second end cap 50 are located at the two ends of the outer casing 10, and the inner spaces are respectively connected with the heat exchange tube 20, which increases the water flow stroke, facilitates the water going back and forth multiple times, and improves the heat exchange efficiency with the refrigerant.

The inner surfaces of the first end cap 40 and the second end cap 50 may be coated with an epoxy resin anti-corrosion layer to prevent corrosion.

The first end cover 40 is provided with a water inlet 401 and a water outlet 402, which are spaced apart from each other. The water inlet 401 , the heat exchange tube 20 , the second end cover 50 and the outlet water 402 are connected to form a water flow channel through which the water supply circulates in and out and exchanges heat with the refrigerant. The water from the water source enters the heat exchange tube 20 through the water inlet 401, flows toward the second end cover 50, and exchanges heat with the refrigerant in the casing 10 during the flow; after reaching the second end cover 50, the second end cover 50 It is folded back into the heat exchange tube 20, and then flows along the heat exchange tube 20 toward the first end cover 40. During the flow, it exchanges heat with the refrigerant in the outer shell 10 again, and finally flows from the water outlet on the first end cover 40. 402 outflow.

As shown in FIG. 3 , the first end cover 40 may include a first cylinder cover 41 with one end closed, and a first end plate 42 connected to the open end of the first cylinder cover 42 . The water inlet 401 and the water outlet 402 are opened on the closed end of the first cylinder cover 41 . The first end plate 42 serves as a flange for mating connection with the corresponding composite plate 30 . When the first end plate 42 is connected to the composite plate 30 , it can be realized by fastening components 43 such as bolts.

The distribution range of the connection holes 33 on the composite plate 30 connected to the first end cover 40 is within the range covered by the outer circumference of the first cylinder cover 41 .

The inner space of the second end cover 50 is communicated with the heat exchange tube 20 to form a water flow turning space in which the water flows out of the heat exchange tube 20 and then turns back into the heat exchange tube 20 . As shown in FIG. 4 , the second end cover 50 may include a second cylinder cover 51 with one end closed, and a second end plate 52 connected to the open end of the second cylinder cover 51 . The second end plate 52 serves as a flange for mating connection with the corresponding composite plate 30 . When the second end plate 52 is connected to the composite plate 30, it can be realized by fastening components 53 such as bolts.

The distribution range of the connection holes 33 on the composite plate 30 connected to the second end cover 50 is within the range covered by the outer circumference of the second cylinder cover 51 .

3 and 4, in order to avoid liquid leakage caused by leaving gaps between the first end cover 40 and the composite plate 30 and between the second end cover 50 and the composite plate 30, the anti-corrosion heat exchanger of the present invention also includes a seal on the first end cover 40 and the composite plate 30. A first sealing ring 60 between one end cap 40 and the corresponding composite plate 30 , and a second sealing ring 70 sealed between the second end cap 50 and the corresponding composite plate 30 .

The first sealing ring 60 surrounds the periphery of the plurality of connecting holes 33 on the corresponding composite board 30 . The second sealing ring 70 surrounds the periphery of the plurality of connecting holes 33 on the corresponding composite board 30 .

In order to further improve the heat exchange efficiency between the water and the refrigerant, the water can be driven to travel back and forth in the casing 10 several times along the heat exchange tube 20 . In order to realize multiple round-trip heat exchanges of water, partition components may be provided in the first end cover 40 and the second end cover 50 to partition the water flow channel into multiple turns.

As shown in FIGS. 3-5 , a first partition assembly 80 is provided between the first end cover 40 and the corresponding composite board 30 to divide the inner space of the first end cover 40 into at least a water inlet end that communicates with the water inlet 401 . , the water outlet end communicated with the water outlet 402, so that the water inlet and outlet water at the first end cover 40 can be separated and not mixed together.

In this embodiment, the first partition assembly 80 includes a first partition plate 81 and a second partition plate 82 . The first partition plate 81 and the second partition plate 82 are arranged at intervals on the composite plate 30 connected to the first end cover 40 . The plurality of connection holes 33 are divided into three groups, which are a first group of connection holes 331 , a second group of connection holes 332 and a third group of connection holes 333 . Each group includes at least two or more connecting holes 33 .

The first partition 81 is arranged around the water inlet 401 and the periphery of the corresponding first group of connection holes 331 , so that the water inlet 401 and the first group of connection holes 331 communicate with each other to form a water inlet end. The second partition 82 is arranged around the water outlet 402 and the corresponding second group of connection holes 332 so that the water outlet 402 and the second group of connection holes 332 communicate with each other to form a water outlet. The third group of connection holes 333 are located between the first partition plate 81 and the second partition plate 82, and the third group of connection holes 333 communicate with the corresponding inner space of the first end cover 40 to form a connection with the water inlet end and the water outlet end. Isolated shuttle. Both ends of the first separator 81 may be connected to the inner wall of the first end cover 40 . Both ends of the second separator 82 may be connected to the inner wall of the first end cap 40 .

After the water enters the water inlet end from the water inlet 401 , it flows into the second end cover 50 along the heat exchange tube 20 connected with the first set of connecting holes 331 , and can be folded back along the heat exchange tube 20 connected with the third set of connecting holes 333 . The heat pipe 20 flows to the reciprocating part, and then turns back from the reciprocating part and flows into the second end cover 50, and then turns back from the second end cover 50 and flows to the first end along the heat exchange pipe 20 connected with the second set of connection holes 332. The water outlet end of the cover 40, so that the water can flow back and forth in the casing 10 to exchange heat with the refrigerant.

Corresponding to the first partition assembly 80, a second partition assembly 90 is provided between the second end cover 50 and the corresponding composite board 30, and separates the water flow return space in the second end cover 50 into at least two water flow return parts, which are respectively connected with the first partition. The water inlet end, the water outlet end and the round-trip portion at the one end cover 40 are communicated through the heat exchange tube 20 .

In this embodiment, the second partition assembly 90 includes a third partition plate 91, which divides the plurality of connection holes 33 on the composite plate 30 connected to the second end cap 50 into two groups, which are the first group of connection holes 334 and The second set of connection holes 335 . The first group of connection holes 334 and the second group of connection holes 335 are respectively located in the two water flow turning parts.

5 and 6 , part of the connection holes of the first group of connection holes 334 at the second end cover 50 are relatively overlapped with the first group of connection holes 331 in the water inlet end, and the first group of connection holes at the second end cover 50 are connected Another part of the connection holes of the holes 334 is relatively coincident with the part of the connection holes of the third group of connection holes 333 in the reciprocating part. Part of the connection holes of the second group of connection holes 335 at the second end cover 50 overlap with another part of the connection holes of the third group of connection holes 333 in the reciprocating part, and the connection holes of the other part are connected to the second group of water outlet ends The holes 332 are relatively coincident. Each pair of overlapping connection holes 33 is respectively connected to opposite ends of each corresponding heat exchange tube 20 .

Combined with the first partition assembly 80 and the second partition assembly 90, after the water enters the heat exchange tube 20 connected with the first set of connection holes 331 from the water inlet end, it flows into the third and third The heat exchange tube 20 connected with the group of connection holes 333 is folded back in the reciprocating portion and flows back to the other water flow return portion of the second end cover 50, and then returns from the other water flow return portion and flows into the water flow return portion connected to the second group of connection holes 332. The heat exchange tube 20 flows out of the first end cover 40 through the water outlet end.

Specifically, in this embodiment, as shown in FIG. 5 and FIG. 6 , the third partition plate 91 may include a V-shaped plate connected to both ends of the V-shaped plate respectively; the two end plates are respectively connected with the second end cover The inner walls of 50 meet. The half side of the third partition plate 91 and the connected end plate are relatively overlapped with the part of the first partition plate 81 , and the other end plate is relatively overlapped with the part of the second partition plate 82 .

Also as shown in FIGS. 3 and 4 , corresponding to the first partition assembly 80 , the first sealing rib 61 is provided on the first sealing ring 60 . There are two first sealing ribs 61 , and the extension shapes are set corresponding to the shapes of the first partition plate 81 and the second partition plate 82 respectively. Corresponding to the second partition assembly 90 , the second sealing ring 70 is provided with a second sealing rib 71 , and the extending shape of the second sealing rib 71 is set corresponding to the shape of the third partition plate 91 .

In the anti-corrosion heat exchanger of other embodiments, the outer shell 10 can also be a steel pipe with one end closed and the other end open. The composite plate 30 is one and closes the open end of the casing 10 . The first end cap 40 is connected to the composite board 30 . The heat exchange tube 20 may be a U-shaped titanium tube, which is arranged in the casing 10 , and the two ends of the heat exchange tube 20 are tightly fitted in the connection holes 33 of the composite plate 30 respectively. The plurality of connection holes 33 on the composite plate 30 can be divided into two groups corresponding to the water inlet 401 and the water outlet 402 respectively. in the connection hole 33 of the water outlet 402 . The water enters the heat exchange tube 20 from the water inlet 401 of the first end cover 40 , flows in the heat exchange tube 20 and exchanges heat with the refrigerant in the casing 10 , and turns along the heat exchange tube 20 in the casing 10 to the water outlet 402 flow in the direction of flow, and finally flow out from the water outlet 402 of the first end cap 40 .

As shown in FIG. 7 , a heat pump system according to an embodiment of the present invention includes a condenser 200 , and the condenser 200 includes at least one anti-corrosion heat exchanger 100 described above.

The heat pump system also includes a refrigeration compressor, an evaporator, and a throttle valve, etc., which are connected in sequence through pipes, and the condenser 200 is connected between the refrigeration compressor and the throttle valve to form a closed system.

The heat pump system of the present invention is suitable for cooling and dehumidifying an indoor swimming pool, and at the same time, the heat generated is exchanged with the pool water through the condenser 200 to realize heat recovery and utilization.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (11)

1. An anti-corrosion heat exchanger, characterized in that the anti-corrosion heat exchanger (100) comprises a steel casing (10) for circulating a refrigerant therein, a plurality of which are arranged at intervals on the casing (10) a titanium heat exchange tube (20) in which water is circulated to exchange heat with the refrigerant, and a composite plate (30) installed on at least one end of the casing (10) to seal the casing (10); The composite plate (30) includes a steel plate (31) and a titanium plate (32) that are relatively integrated by explosive welding; the titanium plate (32) is provided with a through-hole to the heat exchange tube (20) corresponding to the heat exchange tube (20). the connecting hole (33) of the steel plate (31); The steel plate faces the outer shell (10) and is sealingly connected to the port of the outer shell (10); both ends of the heat exchange tube (20) are tightly fitted in the connection holes ( 33), connected with the titanium plate (32). 2. The anti-corrosion heat exchanger according to claim 1, characterized in that, the anti-corrosion heat exchanger (100) further comprises an end portion disposed on the outer shell (10) and connected to the composite plate (30) the first end cap (40); The first end cover (40) is provided with a water inlet (401) and a water outlet (402); the water inlet (401), the heat exchange tube (20) and the outlet water (402) are connected to form a water supply circulation in and out And the water flow channel for heat exchange with the refrigerant. 3. The anti-corrosion heat exchanger according to claim 2, characterized in that, the anti-corrosion heat exchanger comprises two of the composite plates (30), and the two composite plates (30) are respectively arranged on the outer shell The opposite ends of (10); the two ends of the heat exchange tube (20) are tightly fitted in the connecting holes (33) of the two composite plates (30) respectively, and are connected to the titanium plate (32); The anti-corrosion heat exchanger (100) further comprises a second end cover (50), and the first end cover (40) and the second end cover (50) are respectively disposed at two ends of the outer shell (10). and are respectively connected with the corresponding composite boards (30); The inner space of the second end cover (50) is communicated with the heat exchange tube (20) to form a water flow turning space in which the water flows out of the heat exchange tube (20) and then flows back into the heat exchange tube (20). 4. The anti-corrosion heat exchanger according to claim 3, characterized in that, a first partition assembly (80) is provided between the first end cover (40) and the corresponding composite plate (30) to separate the The inner space of the first end cover (40) is at least divided into a water inlet end communicated with the water inlet (401) and a water outlet end communicated with the water outlet (402); A second partition assembly (90) is arranged between the second end cover (50) and the corresponding composite plate (30), and separates at least two water flow turning spaces in the second end cover (50) The water flow return part. 5. The anti-corrosion heat exchanger according to claim 4, wherein the first partition assembly (80) comprises a first partition (81) and a second partition (82), the first partition (81) and the second partition plate (82) are arranged at intervals and the plurality of connection holes on the corresponding composite plate (30) are divided into three groups, which are the first group of connection holes (331) and the second group of connection holes respectively. (332) and a third group of connecting holes (333); The first partition plate (81) is arranged around the water inlet (401) and the corresponding first group of connection holes (331), so that the water inlet (401) and the first group of connection holes (331) Connected to form the water inlet; The second partition plate (82) is arranged on the periphery of the water outlet (402) and the corresponding second group of connection holes (332), so that the water outlet (402) and the second group of connection holes (332) connected to form the water outlet; The third group of connection holes (333) located between the first partition plate (81) and the second partition plate (82) are communicated with the corresponding inner space of the first end cover (40) to form a connection with the water inlet. The back-and-forth part where the end and the water outlet are isolated; After the water enters the heat exchange tube (20) connected to the first group of connection holes (331) from the water inlet end, it flows into the third group of connection holes through a water flow turnback portion of the second end cover (50). (333) The connected heat exchange tube (20) is turned back in the reciprocating portion and flows back to another water flow turning portion of the second end cover (50), and then turns back from the other water flow turning portion and flows into the second end cap (50). The heat exchange tubes (20) connected with the two groups of connection holes (332) flow out of the first end cover (40) through the water outlet end. 6 . The anti-corrosion heat exchanger according to claim 5 , wherein the second partition assembly ( 90 ) comprises dividing a plurality of connecting holes ( 33 ) on the corresponding composite plate ( 30 ) into first a third partition plate (91) of a group of connection holes (334) and a second group of connection holes (335); Part of the connection holes of the first group of connection holes (334) are relatively coincident with the first group of connection holes (331) in the water inlet end, and the other part of the connection holes are aligned with those of the third group of connection holes (333) in the reciprocating portion. Some connection holes are relatively coincident; Part of the connection holes of the second group of connection holes (335) are relatively coincident with another part of the connection holes of the third group of connection holes (333) in the reciprocating part, and the connection holes of the other part are the same as the second group of connection holes in the water outlet. The connecting holes (332) are relatively coincident. 7 . The anti-corrosion heat exchanger according to claim 6 , wherein the third partition plate ( 91 ) comprises a V-shaped plate and two end plates respectively connected to both ends of the V-shaped plate; 7 . The half side of the V-shaped plate and the connected one end plate are relatively overlapped with the part of the first partition plate (81), and the other end plate is relatively overlapped with the part of the second partition plate (82). . 8. The anti-corrosion heat exchanger according to claim 4, characterized in that, the anti-corrosion heat exchanger (100) further comprises a seal between the first end cover (40) and the corresponding composite plate (30) the first sealing ring (60), the second sealing ring (70) sealed between the second end cover (50) and the corresponding composite plate (30); A first sealing rib (61) is provided on the first sealing ring (60) corresponding to the first partition assembly (80); the second sealing ring (70) corresponds to the second partition assembly (90) ) is provided with a second sealing rib (71). 9. The anti-corrosion heat exchanger according to claim 3, wherein the first end cover (40) comprises a first cylinder cover (41) with one end closed, and is connected to the first cylinder cover (41) a first end plate (42) with its open end and the corresponding composite plate (30); the water inlet (401) and the water outlet (402) are opened on the first cylinder cover (41) on the closed end; The second end cover (50) includes a second cylinder cover (51) with one end closed, a second cylinder cover (51) connected to the open end of the second cylinder cover (51) and in cooperation with the corresponding composite plate (30). Second end plate (52). 10. The anti-corrosion heat exchanger according to any one of claims 1-9, characterized in that, the side of the casing (10) is provided with a refrigerant inlet (11) and a refrigerant outlet (12) respectively used for refrigerant in and out . 11. A heat pump system, characterized by comprising a condenser (200), the condenser (200) comprising at least one anticorrosion heat exchanger (100) according to any one of claims 1-10.