CN217274969U - High-efficiency condenser - Google Patents

Abstract

The utility model discloses a high-efficiency condenser, which is applied to the field of high-efficiency condensation and solves the technical problem that the condensation efficiency of the existing equipment is lowered because the speed of the liquid refrigerant flowing out of the equipment is too slow; the key points of the technical scheme are as follows: the heat exchange tube group is arranged in a cavity formed by the shell; the drainage component comprises an air inlet drainage plate group and a liquid outlet drainage plate, the air inlet drainage plate group is fixed between the joints of the inner walls of the two circular tubes of the shell, the air inlet drainage plate group divides the cavity in the shell into an air inlet cavity and a liquid outlet cavity, and the liquid outlet drainage plate is fixed at the position, opposite to the air inlet drainage plate, of the inner wall of the shell where the liquid outlet cavity is located; has the technical effects that: the liquid refrigerant in the equipment is quickly discharged through the action of the drainage assembly, so that the condensation efficiency is improved.

Description

High-efficiency condenser

Technical Field

The utility model relates to a condensation field, in particular to high-efficient condensation.

Background

In industrial production and daily life, refrigeration equipment is often needed, a condenser is a part of a refrigeration system, heat in a pipe fitting is quickly conducted to ambient air in a mode of converting gas into liquid, the condenser plays a vital role in ensuring normal operation of the equipment, and along with gradual development of the refrigeration equipment, the improvement of the working efficiency of the condenser is particularly important.

At present, the chinese patent application with publication number CN112033053A discloses a high-efficiency condenser, which comprises a shell, the left end cover and the right end cover are fixedly installed at two ends of the shell, a left cavity is formed between the end portions of the left end cover and the shell, a baffle is arranged in the right end cover, the end portion of the right end cover is respectively connected with a water inlet pipe and a water outlet pipe, an air inlet pipe is installed at the top of the shell, a liquid outlet pipe is installed at the bottom of the shell, a water inlet heat exchange pipe is connected between the left cavity and the water inlet cavity, a water outlet heat exchange pipe is connected between the left cavity and the water outlet cavity, a partition plate is installed in the shell and divides the shell into an upper cavity and a lower cavity, flow guide structures are installed in the upper cavity and the lower cavity respectively and comprise flow guide plates and fixing screw rods, one ends of the fixing screw rods are arranged on the end face of the shell, and the flow guide plates are sequentially and alternately and fixedly installed on the fixing screw rods.

Although the existing high-efficiency condenser improves the condensation quality by increasing the length of the gas to pass through, the improvement of the outflow speed of the condensed liquid refrigerant is still greatly influenced by the structure, and the condensation efficiency is influenced by the slow outflow speed of the liquid refrigerant.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high-efficient condenser, its advantage is can improve condensation efficiency through the method with the liquid refrigerant quick exhaust after the condensation.

The above technical purpose of the present invention can be achieved by the following technical solutions: the shell is formed by splicing and communicating two circular tubes; the front cover and the tail cover are respectively covered at openings at two ends of the shell;

a condensation cavity is arranged in the shell, a heat exchange tube group and a drainage component are arranged in the condensation cavity,

the drainage assembly comprises an air inlet drainage plate group and a liquid outlet drainage plate;

the air inlet guide plate group is fixed between the joints of the inner walls of the two circular tubes of the shell;

the air inlet guide plate group divides the condensation cavity into an air inlet cavity and a liquid outlet cavity;

the liquid outlet drainage plate is fixed at the position, opposite to the air inlet drainage plate, of the inner wall of the shell where the liquid outlet cavity is located.

Through the technical scheme, the shell, the front cover and the tail cover form the integral shell of the equipment; the heat exchange tube set is arranged in a condensation cavity formed by the shell, is a carrier through which the secondary refrigerant passes, and realizes a condensation effect by heat exchange with the gaseous refrigerant passing through the shell; the air inlet drainage plate group is fixed between the joints of the inner walls of the two circular tubes of the shell, the cavity in the shell can be divided into two parts, the drainage effect of liquid refrigerants in one part of the cavity is enhanced, the drainage effect of liquid refrigerants in the other part of the cavity can be enhanced through the liquid outlet drainage plate, the drainage speed is accelerated, and the condensation efficiency is improved.

The utility model discloses further set up to: the air inlet and flow guide plate group comprises an inclined plate body and a flow guide U-shaped plate;

the cross section of the drainage U-shaped plate is a U-shaped bent wide plate;

one side of the drainage U-shaped plate opposite to the bending direction is provided with a sunken drainage groove;

the middle part of the drainage U-shaped plate is fixedly connected with one end of the inclined plate body;

and an air inlet drainage groove is formed in the inclined plate body and is communicated with the drainage groove in the drainage U-shaped plate.

Through the technical scheme, the inclined plate body can accelerate the liquid refrigerant to flow along the inclined direction of the inclined plate body, and the air inlet drainage groove can also accelerate the drainage speed of the liquid refrigerant through the flow gathering function of the liquid refrigerant; the air inlet drainage groove is communicated with the drainage groove on the drainage U-shaped plate, so that the liquid refrigerant can flow into the drainage U-shaped plate from the inclined plate body and flow into the bottom of the cavity in the shell through the drainage U-shaped plate; the U-shaped design of the drainage U-shaped plate can guide the liquid refrigerant to directly flow into the bottom of the cavity, so that the liquid refrigerant is prevented from contacting the heat exchange tube group; the condensation effect is enhanced.

The utility model discloses further set up to: a sealed second partition wall is arranged between the front cover and the shell;

the front cover comprises a front cover wall with a 8-shaped cross section and a front cover plate;

the second partition wall, the front cover wall and the front cover plate divide the cavity in the front cover into a water inlet cavity and a water outlet cavity;

the water inlet cavity is opposite to the liquid outlet cavity, and the water outlet cavity is opposite to the air inlet cavity;

a sealed first partition wall is arranged between the tail cover and the shell;

a tail cavity is formed between the tail cap and the first partition wall.

Through the technical scheme, the first partition wall and the second partition wall can separate the chambers from each other to prevent gas-liquid exchange between the chambers; the water inlet cavity is used for enabling secondary refrigerant to enter the heat exchange tube group, the water outlet cavity is used for enabling the secondary refrigerant to flow out of the heat exchange tube group, and the tail cavity enables the secondary refrigerant to flow into the water outlet cavity from the water inlet cavity, so that the secondary refrigerant can smoothly circulate in the equipment, and the condensation efficiency is guaranteed.

The utility model discloses further set up to: the front cover is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is communicated with the water inlet cavity, and the water outlet pipe is communicated with the water outlet cavity.

Through the technical scheme, the water inlet pipe is used for enabling the secondary refrigerant to flow into the water inlet cavity, and the water outlet pipe enables the secondary refrigerant to flow out of the water outlet cavity, so that the secondary refrigerant is enabled to smoothly circulate in the equipment, and the condensation efficiency is guaranteed.

The utility model discloses further set up to: the heat exchange tube group comprises a plurality of water inlet heat exchange tubes and a plurality of water outlet heat exchange tubes, the cross sections of the water inlet heat exchange tubes and the water outlet heat exchange tubes are rhombic;

the plurality of water inlet heat exchange pipes penetrate between the first partition wall and the second partition wall, and two ends of the water inlet heat exchange pipes extend into the tail cavity and the water inlet cavity respectively;

the water outlet heat exchange tubes penetrate between the first partition wall and the second partition wall, and two ends of the water outlet heat exchange tubes respectively extend into the tail cavity and the water outlet cavity.

Through the technical scheme, the plurality of water inlet heat exchange tubes and the plurality of water outlet heat exchange tubes with rhombic cross sections can enable the liquid refrigerant to flow down from the outer walls of the heat exchange tubes quickly so as to enter the drainage assembly, so that the drainage effect is accelerated; the water inlet heat exchange tube penetrates between the first partition wall and the second partition wall, two ends of the water inlet heat exchange tube respectively extend into the tail cavity and the water inlet cavity, the water outlet heat exchange tube penetrates between the first partition wall and the second partition wall, two ends of the water outlet heat exchange tube respectively extend into the tail cavity and the water outlet cavity, so that the secondary refrigerant can enter the water inlet heat exchange tube from the water inlet cavity, then enters the tail cavity from the water inlet heat exchange tube, then enters the water outlet heat exchange tube through the tail cavity, and then flows into the water outlet cavity, and the condensation effect is ensured.

The utility model discloses further set up to: an opening for communicating the air inlet cavity and the liquid outlet cavity is formed between the air inlet drainage plate group and the first partition plate.

Through the technical scheme, the opening can enable the gaseous refrigerant which is not condensed in the air inlet chamber to enter the liquid outlet chamber to be condensed continuously, and the quality of condensation is guaranteed.

The utility model discloses further set up to: an air inlet and a liquid outlet are formed in one end, close to the second partition wall, of the shell, the air inlet is communicated with the air inlet cavity, and the liquid outlet is communicated with the liquid outlet cavity

The liquid outlet is formed in the bottom of the shell;

the air inlet is arranged at the top of the shell.

Through the technical scheme, the gas inlet is used for allowing the gaseous refrigerant to enter the gas inlet chamber for condensation, and the liquid outlet is used for discharging the condensed liquid refrigerant and residual gas; the air inlet and the liquid outlet are arranged at one end close to the second partition wall and can be far away from an opening formed between the air inlet guide plate group and the first partition wall, so that the flowing length of the gaseous secondary refrigerant is the largest, and the condensing quality is ensured.

The utility model discloses further set up to: the liquid outlet drainage plate is an inclined plate attached to the inner wall of the shell, the liquid outlet drainage plate is fixed to one end, close to the first partition wall, of the inner wall of the shell, and the inclined lower side of the liquid outlet drainage plate faces the liquid outlet.

Through above-mentioned technical scheme, go out the liquid drainage plate and can make the liquid secondary refrigerant after the condensation directly flow in the liquid outlet through going out the liquid drainage plate, improved the efficiency of condensation.

The utility model discloses further set up to: the tail cover is also provided with an exhaust pipe for discharging waste gas in the tail cavity and a drain pipe for discharging residual secondary refrigerant in the tail cavity;

the exhaust pipe is arranged at the top end of the tail cavity, and the drain pipe is arranged at the bottom end of the tail cavity.

Through the technical scheme, the exhaust pipe can timely exhaust air in the tail cavity when the secondary refrigerant enters the tail cavity, so that the air pressure balance in the tail cavity is ensured; the drain pipe can discharge the residual refrigerating medium in the tail cavity when the equipment is not used, thereby being beneficial to the maintenance of the equipment.

To sum up, the utility model discloses following beneficial effect has:

1. the liquid refrigerant condensed by the outer walls of the water inlet heat exchange tube and the water outlet heat exchange tube can flow down rapidly, so that the contact time of the outer walls of the water inlet heat exchange tube and the water outlet heat exchange tube and the gaseous secondary refrigerant is prolonged, and the condensing efficiency is improved;

2. the liquid refrigerant can be quickly discharged through the action of the drainage assembly, and the discharge efficiency of the liquid refrigerant is improved.

Drawings

FIG. 1 is an overall configuration diagram of the present embodiment;

FIG. 2 is a cross-sectional view of the intermediate position of the present embodiment;

FIG. 3 is a cross-sectional view of the drainage U-shaped plate of the present embodiment in a vertical plane;

FIG. 4 is a schematic structural view of an intake baffle group of the present embodiment;

FIG. 5 is a schematic structural view of the liquid outlet flow guide plate of the present embodiment;

reference numerals: 1. a housing; 11. a safety valve interface; 12. a pressure gauge interface; 13. an air inlet; 14. a liquid outlet; 15. an air intake chamber; 16. a liquid outlet chamber; 2. a front cover; 21. a water inlet pipe; 22. a water outlet pipe; 23. a water inlet cavity; 24. a water outlet cavity; 25. a front cover wall; 26. a front cover plate; 3. a tail cover; 31. an exhaust pipe; 32. a drain pipe; 33. a tail cavity; 4. a heat exchange tube set; 41. a water inlet heat exchange pipe; 42. a water outlet heat exchange pipe; 5. a drainage assembly; 51. an air inlet guide plate group; 511. inclining the plate body; 512. an air inlet drainage groove; 513. draining a U-shaped plate; 52. liquid discharging drainage plates; 521. liquid discharging drainage grooves; 6. a first partition wall; 7. a second partition wall.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

referring to fig. 1, the high-efficiency condenser comprises a shell 1, a front cover 2, a tail cover 3, a flow guide assembly 5 and a heat exchange tube group 4; the shell 1 is formed by splicing two circular tubes, the splicing position is an opening, and the splicing position forms a linear side wall; the front cover 2 and the tail cover 3 are fixedly connected with two ends of the shell 1 through threads; the heat exchange tube set 4 is arranged in a condensation chamber formed by the housing 1.

Referring to fig. 3 and 4, the drainage assembly 5 comprises an inlet drainage plate set 51 and an outlet drainage plate 52; the air inlet guide plate group 51 comprises an inclined plate body 511 and a guide U-shaped plate, wherein the inclined plate body 511 is formed by splicing a rectangular short plate and a long plate with a trapezoidal cross section, and four air inlet guide grooves 512 are formed by inwards recessing the inclined side wall on the long plate and are used for gathering liquid refrigerants and accelerating the flowing speed of the liquid refrigerants.

Referring to fig. 3 and 4, the drainage U-shaped plate 513 is formed by integrally injection molding a straight plate and two arc-shaped bent plates, and the straight plate and the two arc-shaped bent plates have the same U-shaped cross section and are recessed toward the bent side of the arc-shaped bent plate; the straight plate of the flow guiding U-shaped plate 513 is welded and fixed with the end, with smaller thickness, of the inclined plate body 511, and the groove of the flow guiding U-shaped plate 513 is communicated with the air inlet flow guiding groove 512 and used for guiding liquid refrigerant to directly flow into the bottom of the condensation cavity from the flow guiding U-shaped plate 513.

The inclined plate body 511 of the air inlet guide plate group 51 is welded between two linear side walls at the splicing position of the shell 1, the lower end of the inclined plate body 511 exceeds the bottom end of the linear side walls, and the guide U-shaped plate 513 is positioned inside the shell 1 and is spaced from the circular side walls.

Referring to fig. 1 and fig. 2, the air inlet guide plate group 51 divides the condensation cavity in the shell 1 into an air inlet cavity 15 and a liquid outlet cavity 16, and the air inlet cavity 15 is located at the top end of the liquid outlet cavity 16; the front cover 2 comprises a front cover 2 wall with a 8-shaped cross section and a front cover plate 26 welded and fixed with the front cover wall 25, a second partition wall 7 is fixed at the joint part of the front cover 2 and the shell 1, the second partition wall 7 is fixed with the end part of the shell 1 in a gluing and sealing manner, the second partition wall 7 and the front cover 2 divide the inner cavity of the front cover 2 into a water inlet cavity 23 and a water outlet cavity 24, and the water inlet cavity 23 is positioned at the bottom of the water outlet cavity 24.

A water inlet pipe 21 and a water outlet pipe 22 are connected on the front cover 2 in a penetrating way, the water inlet pipe 21 is communicated with the water inlet cavity 23 and is welded at the middle position of a front cover plate 26 and a semi-circular plate; the water outlet pipe 22 is communicated with the water outlet cavity 24 and welded at the top end of the front cover wall 25, so that the heat exchange tube set 4 can be fully filled with the secondary refrigerant, and the condensation efficiency can be ensured.

Referring to fig. 1 and 2, the tail cover 3 is formed by splicing two circular covers, and the joint is an opening, a first partition wall 6 is arranged at the joint part of the tail cover 3 and the shell 1, the first partition wall 6 is fixed at one end of the shell 1 far away from the second partition wall 7 by gluing, and a tail cavity 33 is formed between the first partition wall 6 and the tail cover 3; an opening for communicating the air inlet chamber 15 and the liquid outlet chamber 16 is formed between the first partition wall 6 and the air inlet guide plate group 51 for the gaseous refrigerant to pass through.

Referring to fig. 2 and 3, the heat exchange tube set 4 includes a plurality of water inlet heat exchange tubes 41 and a plurality of water outlet heat exchange tubes 42, the cross sections of the water inlet heat exchange tubes 41 and the water outlet heat exchange tubes 42 are rhombus, and four corners of the rhombus are fillets; the plurality of water inlet heat exchange tubes 41 are horizontally distributed in the liquid outlet cavity 16 along the length direction, the plurality of water outlet heat exchange tubes 42 are horizontally distributed in the air inlet cavity 15 along the length direction, and the rhombic vertexes of the plurality of water inlet heat exchange tubes 41 and the plurality of water outlet heat exchange tubes 42 are distributed in a staggered manner, so that condensed liquid refrigerant can flow down quickly; two ends of the plurality of water inlet heat exchange tubes 41 and two ends of the plurality of water outlet heat exchange tubes 42 are respectively glued on the first partition wall 6 and the second partition wall 7, two ends of the water inlet heat exchange tubes 41 respectively extend into the water inlet cavity 23 and the tail cavity 33, and two ends of the water outlet heat exchange tubes 42 respectively extend into the water outlet cavity 24 and the tail cavity 33.

Referring to fig. 2, an exhaust pipe 31 and a drain pipe 32 are welded on the tail cover 3, the exhaust pipe 31 is welded at the top end of the side wall of the tail cover 3, the drain pipe 32 is welded at the bottom end of the side wall of the tail cover 3, and the exhaust pipe 31 is used for exhausting air in the tail cavity 33 when secondary refrigerant enters the tail cavity 33, so as to ensure the air pressure balance in the tail cavity 33; the drain pipe 32 is used for draining the coolant remained in the tail cavity 33 when the equipment is not used, so that the maintenance of the equipment is convenient.

Referring to fig. 2 and 5, a gas inlet 13 and a liquid outlet 14 are welded on the shell 1, and the gas inlet 13 is welded at the top end position of the shell 1 close to the first partition wall 6 and used for gaseous condensing agent to enter the equipment; the liquid outlet 14 is welded at the bottom end position of the shell 1 close to the first partition wall 6 and is used for discharging liquid refrigerant and residual gas out of the equipment; the liquid outlet flow guiding plate 52 is an inclined plate integrally formed with the inner wall of the housing 1, and the inclined side is disposed toward the liquid outlet 14 and has two liquid outlet flow guiding grooves 521 for guiding the liquid refrigerant to flow into the liquid outlet 14.

Referring to fig. 1, a safety valve interface 11 and a pressure gauge interface 12 are welded on a shell 1 and are used for connecting a safety valve and a pressure gauge to ensure the safety of a condensation process.

The using process is briefly described as follows: the secondary refrigerant enters the water inlet cavity 23 through the water inlet pipe 21, then flows into the water inlet heat exchange pipes 41 from the water inlet cavity 23 and then flows into the tail cavity 33, after the secondary refrigerant in the tail cavity 33 reaches a certain depth, the secondary refrigerant starts to flow into the water outlet heat exchange pipes 42 and then flows into the water outlet cavity 24, after the water outlet cavity 24 is filled with the secondary refrigerant, the secondary refrigerant starts to flow out of the equipment through the water outlet pipe 22, and at the moment, all the water outlet heat exchange pipes 42 and the water inlet heat exchange pipes 41 are filled with the secondary refrigerant.

Gaseous refrigerant to be condensed enters the air inlet chamber 15 through the air inlet 13 and is condensed through the plurality of water outlet heat exchange tubes 42 in the air inlet chamber 15, and the condensed liquid refrigerant is gathered on the outer walls of the water outlet heat exchange tubes 42, then directly flows into the air inlet flow guide groove 512 or flows into the air inlet flow guide groove 512 through the inner wall of the shell 1, then flows into the flow guide U-shaped plate 513 through the air inlet flow guide groove 512, and then flows into the liquid outlet flow guide groove 521 of the liquid outlet flow guide plate 52 through the flow guide U-shaped groove;

the gas refrigerant which is not completely condensed in the air inlet chamber 15 enters the liquid outlet chamber 16 through the opening between the first partition plate and the air inlet drainage plate group 51, the condensation is continued in the liquid outlet chamber 16, the liquid refrigerant condensed from the gas refrigerant flows into the liquid outlet drainage groove 521 of the liquid outlet drainage plate 52 through the outer wall of the water inlet heat exchange tube 41, and the liquid refrigerant in the liquid outlet drainage groove 521 jointly flows into the liquid outlet 14 and flows out of the device.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims (9)

1. A high-efficiency condenser comprises a shell (1), a front cover (2) and a tail cover (3), wherein the shell (1) is formed by communicating two circular tubes; the front cover (2) and the tail cover (3) are respectively covered on openings at two ends of the shell (1);

it is characterized in that a condensation cavity is arranged in the shell (1), a heat exchange tube group (4) and a drainage component (5) are arranged in the condensation cavity,

the drainage assembly (5) comprises an air inlet drainage plate group (51) and an liquid outlet drainage plate (52);

the air inlet guide plate group (51) is fixed between the joints of the inner walls of the two circular tubes of the shell (1);

the air inlet guide plate group (51) divides the condensation cavity into an air inlet cavity (15) and a liquid outlet cavity (16);

the liquid outlet and drainage plate (52) is fixed at the position, opposite to the air inlet and drainage plate, of the inner wall of the shell (1) where the liquid outlet chamber (16) is located.

2. A condenser as claimed in claim 1, wherein the set of inlet baffles (51) comprises inclined plates (511) and baffles (513);

the cross section of the drainage U-shaped plate (513) is a U-shaped bent wide plate;

one side of the drainage U-shaped plate (513), which is opposite to the bending direction, is provided with a sunken drainage groove;

the middle part of the drainage U-shaped plate (513) is fixedly connected with one end of the inclined plate body (511);

an air inlet drainage groove (512) is formed in the inclined plate body (511), and the air inlet drainage groove (512) is communicated with a drainage groove in the drainage U-shaped plate (513).

3. A condenser as claimed in claim 1, wherein a second sealed partition (7) is provided between the front cover (2) and the casing (1);

the front cover (2) comprises a front cover wall (25) with an 8-shaped cross section and a front cover plate (26);

the second partition wall (7), the front cover wall (25) and the front cover plate (26) divide the cavity in the front cover (2) into a water inlet cavity (23) and a water outlet cavity (24);

the water inlet cavity (23) is opposite to the liquid outlet cavity (16), and the water outlet cavity (24) is opposite to the air inlet cavity (15);

a sealed first partition wall (6) is arranged between the tail cover (3) and the shell (1);

a tail cavity (33) is formed between the tail cover (3) and the first partition wall (6).

4. A high-efficiency condenser as claimed in claim 3, characterized in that the front cover (2) is provided with a water inlet pipe (21) and a water outlet pipe (22), the water inlet pipe (21) is communicated with the water inlet cavity (23), and the water outlet pipe (22) is communicated with the water outlet cavity (24).

5. A high-efficiency condenser as claimed in claim 3, characterized in that the heat exchange tube set (4) comprises a plurality of water inlet heat exchange tubes (41) and a plurality of water outlet heat exchange tubes (42) with rhombic cross sections;

the plurality of water inlet heat exchange tubes (41) penetrate between the first partition wall (6) and the second partition wall (7), and two ends of the water inlet heat exchange tubes respectively extend into the tail cavity (33) and the water inlet cavity (23);

the water outlet heat exchange tubes (42) penetrate through the first partition wall (6) and the second partition wall (7), and two ends of the water outlet heat exchange tubes respectively extend into the tail cavity (33) and the water outlet cavity (24).

6. A condenser according to claim 3, characterised in that the inlet guide plate set (51) is separated from the first partition by an opening communicating between the inlet chamber (15) and the outlet chamber (16).

7. The condenser of claim 1, wherein the casing (1) has an inlet (13) and an outlet (14) at an end thereof adjacent to the second partition wall (7), the inlet (13) is communicated with the inlet chamber (15), and the outlet (14) is communicated with the outlet chamber (16)

The liquid outlet (14) is formed in the bottom of the shell (1);

the air inlet (13) is formed in the top of the shell (1).

8. The condenser of claim 7, wherein the liquid outlet and flow guiding plate (52) is an inclined plate attached to the inner wall of the casing (1), and the liquid outlet and flow guiding plate (52) is fixed at one end of the inner wall of the casing (1) close to the first partition wall (6) and faces the liquid outlet (14) at the inclined lower side.

9. A condenser as claimed in claim 3, wherein the tail cover (3) is further provided with an exhaust pipe (31) for exhausting the waste gas in the tail cavity (33) and a drain pipe (32) for exhausting the residual coolant in the tail cavity (33);

the exhaust pipe (31) is arranged at the top end of the tail cavity (33), and the drain pipe (32) is arranged at the bottom end of the tail cavity (33).

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