CN211146866U

CN211146866U - Tube shell dry-type evaporator and water chilling unit

Info

Publication number: CN211146866U
Application number: CN201922028916.9U
Authority: CN
Inventors: 陈勇浩; 李炎生
Original assignee: Daikin Air Conditioning Shanghai Co Ltd
Current assignee: Daikin Air Conditioning Shanghai Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-07-31
Anticipated expiration: 2029-11-21

Abstract

The utility model relates to an air conditioning technology field discloses a tube shell dry-type evaporator, include: the heat exchange unit is composed of a plurality of heat exchange tubes arranged in parallel; the tube plate is arranged at the end part of the heat exchange unit; the outer edge part of the rear cover is fixedly connected with the tube plate, and the central part of the rear cover protrudes in the direction far away from the tube plate, so that a chamber communicated with the heat exchange tube is formed between the rear cover and the tube plate; the tube and shell dry-type evaporator further comprises: and the liquid baffle is positioned in the cavity. When the unit is started again, the liquid refrigerant flowing out of the heat exchange tube enters the cavity of the rear cover and is intercepted by the liquid baffle plate, then falls into the bottom area of the rear cover from the liquid baffle plate, and the gaseous refrigerant bypasses the liquid baffle plate and then reaches the leeward surface of the liquid baffle plate and flows into the air suction tube, so that the gas-liquid separation of the refrigerant is completed, the liquid impact of the compressor caused by the fact that a large amount of liquid refrigerant enters the air suction tube during the starting is effectively relieved or avoided, and the compressor is protected.

Description

Tube shell dry-type evaporator and water chilling unit

Technical Field

The utility model relates to an air conditioning technology field, in particular to shell of pipe dry-type evaporator and cooling water set.

Background

With social development, more and more buildings use water chilling units, and dry water chilling units occupy a large share in the water chilling market due to the advantages of mature technology, low cost, small volume and the like. In the existing dry water-cooling water chilling unit, an air suction port of an air suction pipe is arranged opposite to a pipe plate, and the flow of a refrigerant in an evaporator is regulated within a proper range through an electronic expansion valve, so that the refrigerant is in an overheated state at an outlet of the evaporator, and the liquid refrigerant is prevented from being brought into a compressor to cause liquid impact on the compressor.

The control is feasible during normal operation, but the liquid impact phenomenon can still be generated under abnormal operation conditions such as machine halt and restart. Because the compressor stops when the unit stops, the refrigerant system loses power, and the refrigerant is condensed into liquid in the evaporator under the action of pressure difference and is gathered in the heat exchange tube and the front cover and the rear cover of the evaporator. When the unit is started again, the refrigerant condensed into liquid in the evaporator is directly sucked into the compressor by the air suction pipe opposite to the heat exchange pipe, so that the liquid impact of the compressor is caused, and the service life of the compressor is shortened and even the compressor fails.

SUMMERY OF THE UTILITY MODEL

The present invention is provided to solve the above technical problems, and an object of the present invention is to provide a tube shell dry evaporator. The utility model discloses a tube dry evaporator, when the unit is started once more, the cavity of lid and by the fender liquid board interception after the liquid refrigerant that flows from the heat exchange tube gets into, then fall into the bottom region of back lid from the fender liquid board, and the leeward side that the liquid board was reachd behind the fender liquid board is then walked around to the gaseous state refrigerant, and the inflow breathing pipe, accomplish the gas-liquid separation of refrigerant, a large amount of liquid refrigerants are wrapped up in by the air current and get into the breathing pipe and cause the compressor liquid to hit when effectively lightening or avoiding the start, protect the compressor.

Particularly, the utility model provides a shell and tube dry evaporator, include:

the heat exchange unit is composed of a plurality of heat exchange tubes arranged in parallel;

the tube plate is arranged at the end part of the heat exchange unit;

the outer edge part of the rear cover is fixedly connected with the tube plate, and the central part of the rear cover protrudes in the direction far away from the tube plate, so that a chamber communicated with the heat exchange tube is formed between the rear cover and the tube plate;

an air intake duct communicating with the chamber;

the tube and shell dry-type evaporator further comprises:

and the liquid baffle is positioned in the cavity and arranged on the air suction flow path of the air suction pipe in a mode of facing the heat exchange pipe.

Compared with the prior art, the utility model provides a tube shell dry evaporator, through setting up the fender liquid board, shut down the liquid refrigerant of back in the heat exchange tube condensation formation, in the route towards the breathing pipe motion, can at first receive the interception effect of fender liquid board, and avoid in the compressor by direct suction, and the gaseous state refrigerant that flows from the heat exchange tube then can walk around behind the fender liquid board in getting into the breathing pipe from the through-hole, the gas-liquid separation of refrigerant has been realized, reduce or avoid liquid refrigerant to be sent into in the breathing pipe, thereby compressor liquid attack when lightening or avoiding the start, the protection compressor.

Preferably, the suction pipe is connected to the chamber from the side of the liquid guard facing the heat exchange tube through a through hole in the liquid guard.

The suction pipe is communicated with the cavity through the through hole from one side of the windward side, so that the suction pipe does not directly suck air towards the heat exchange pipe, a bent air suction flow path is formed, the liquid baffle plate arranged at the bent position is used for intercepting liquid refrigerants in air flow, and the liquid refrigerants discharged from the heat exchange pipe are further prevented from being directly wrapped by air flow and sucked into the suction pipe.

In addition, preferably, the liquid baffle plate and the tube plate are obliquely arranged at a certain included angle.

According to the preferred scheme, the inclined liquid baffle plate can generate a certain inclined guiding effect on the air flow, so that the air flow is favorably guided to enter the air suction pipe from the leeward side by bypassing the windward side of the liquid baffle plate.

Further, preferably, the included angle is 25 ° to 45 °.

Preferably, one end of the liquid barrier is fixed to the top of the rear cover.

According to the preferred embodiment, the liquid refrigerant discharged from the heat exchange tubes located at the upper portion can be brought into effective contact with the liquid baffle and efficiently intercepted. Due to the arrangement of the liquid baffle plate, the port of the air suction pipe is also arranged at the upper part, one part of liquid refrigerant discharged from the heat exchange pipe at the lower part is retained below the chamber under the action of gravity, and the other part of liquid refrigerant moves upwards along with the gaseous refrigerant and is still intercepted after contacting the leeward surface of the liquid baffle plate. Therefore, the liquid baffle is arranged, so that the liquid refrigerant flowing out of the heat exchange tube in a large range can be intercepted, and the gas-liquid separation effect of the refrigerant is improved. In addition, during the shutdown, part of the refrigerant condenses and accumulates in the front and rear covers. By fixing the end of the liquid baffle plate and the top of the rear cover, the refrigerant accumulated at the bottom of the rear cover in a shutdown state is not easy to be sucked into the suction pipe after the compressor is started.

Further, as preferred, keep away from on the fender liquid board with back lid fixed connection's one end is provided with the drainage plate, drainage plate and tube sheet parallel arrangement.

According to the preferred scheme, the intercepted liquid refrigerant can be converged and drained at the drainage plate by using the drainage plate, and the liquid refrigerant is helped to fall to the bottom of the rear cover at a specified position.

Preferably, the contour of the liquid baffle is matched with the shape of the inner wall of the rear cover.

According to the preferred scheme, the liquid baffle has larger area, and can effectively intercept the liquid refrigerant flowing out of the heat exchange tube right opposite to the liquid baffle, so that the gas-liquid separation capacity of the liquid baffle is improved.

Preferably, the suction pipe is provided so as to penetrate through one end of the liquid blocking plate and be parallel to the plate surface of the liquid blocking plate or protrude from the liquid blocking plate.

The utility model also provides a water chilling unit, include as in aforementioned arbitrary technical scheme shell dry evaporator.

Drawings

FIG. 1 is a schematic structural view of a tube and shell dry evaporator according to a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the rear cover portion structure of FIG. 1;

fig. 3 is a schematic structural view (as viewed from the windward side) of the rear cover portion in the first embodiment of the present invention;

FIG. 4 is a schematic structural view of a liquid baffle according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a water chiller according to a second embodiment of the present invention.

Description of reference numerals:

1. a barrel; 2. a heat exchange pipe; 3. a heat exchange unit; 4. a tube sheet; 5. a front cover; 6. a rear cover; 7. a liquid inlet; 8. a liquid baffle; 9. a through hole; 10. the windward side; 11. a leeward side; 12. an air intake duct; 13. a drainage plate; 14. a chilled water inlet pipe; 15. a chilled water outlet pipe; 16. a baffle plate; 17. a compressor; 18. a condenser; 19. an expansion valve; 20. a tube and shell dry evaporator; A. a refrigerant; B. freezing water; C. a chamber.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. The structures of the tube-shell dry-type evaporator, the water chilling unit and the like are schematically and simply shown in the drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Implementation mode one

The utility model discloses a first embodiment provides a tube shell dry evaporator, see that fig. 1 shows, including the barrel 1 that is the cavity tube-shape, be provided with many parallel heat exchange tubes 2 in barrel 1, many heat exchange tubes 2 constitute the heat transfer unit 3 of tube shell dry evaporator, and refrigerant A circulates in heat exchange tube 2. Tube plates 4 are arranged at two ends of the cylinder body 1, and the tube plates 4 are arranged at two ends of the cylinder body 1. The outer sides of the two tube plates 4 are respectively provided with a front cover 5 and a rear cover 6, the front cover 5 is provided with a liquid inlet 7, and the front cover 5 and the rear cover 6 are matched with the two tube plates 4, so that the inside of the barrel body 1 is isolated from the inside of the front cover 5 and the inside of the rear cover 6. The two ends of the heat exchange tubes 2 penetrate through the two tube plates 4 and then extend into the front cover 5 and the rear cover 6, and the inside of the front cover 5, the inside of the barrel body 1 and the inside of the rear cover 6 are communicated by the heat exchange tubes 2. The outer edge portion of the rear cover 6 is fixedly connected to the tube sheet 4, and the central portion of the rear cover 6 projects in a direction away from the tube sheet 4, thereby forming a chamber C communicating with the heat exchange tubes 2 between the rear cover 6 and the tube sheet 4.

As shown in fig. 2 and 3, a liquid baffle plate 8 is disposed in the chamber C, and the liquid baffle plate 8 is provided with a through hole 9 (see fig. 4) and has a windward surface 10 facing the heat exchange tube 2 and a leeward surface 11 facing away from the heat exchange tube 2. The tube shell dry-type evaporator further comprises an air suction pipe 12, one end of the air suction pipe 12 extends out of the rear cover 6, the other end of the air suction pipe is located in the cavity C, and the air suction pipe is communicated with the cavity C from the windward side 10 side of the liquid baffle plate 8 through the through hole 9.

Refrigerant A passes through the tube pass, and chilled water B passes through the shell pass. The liquid refrigerant A flows through the liquid inlet 7 in the heat exchange tube 2, exchanges heat with the chilled water B on the surface of the heat exchange tube 2, is evaporated to form superheated gaseous refrigerant A, and is discharged out of the tube-shell dry evaporator through the air suction tube 12 and then enters the compressor. Under the abnormal operation working conditions of the stop and restart of the water chilling unit and the like, the compressor stops, the refrigerant A system loses power, and under the action of pressure difference, the gaseous refrigerant A is condensed into liquid in the tube-shell dry evaporator and is gathered in the heat exchange tube 2 and at the bottoms of the front cover 5 and the rear cover 6.

In the embodiment, because the liquid baffle plate 8 is additionally arranged, when the water chiller is started again, the liquid refrigerant a flowing out of the heat exchange tube 2 cannot directly enter the air suction tube 12 from the side of the windward side 10, but is intercepted by the liquid baffle plate 8 firstly, then is attached to the liquid baffle plate 8 for condensation, and finally falls into the bottom of the chamber C under the action of gravity. The gaseous refrigerant a flowing out of the heat exchange tube 2 can bypass the liquid baffle 8 to the leeward side 11 and then be discharged from the suction tube 12. The liquid baffle plate 8 is utilized to separate the gas and the liquid of the refrigerant A flowing out of the heat exchange tube 2, the liquid refrigerant A which enters the air suction pipe 12 and reaches the compressor under the abnormal operation working condition is reduced, the liquid impact of the compressor is avoided, the fault of the compressor is reduced, and the service life of the compressor is prolonged.

The liquid baffle plate 8 and the tube plate 4 are arranged in an inclined mode at a certain included angle, and the included angle is formed by inclining the liquid baffle plate 8 relative to the surface where the end opening of the barrel body 1 is located. The included angle formed by the liquid baffle plate 8 and the tube plate 4 is 25-45 degrees, and preferably 30 degrees. The inclined liquid baffle 8 can increase the intercepting area of the liquid baffle 8, thereby intercepting more liquid refrigerant a and simultaneously, also giving a guiding effect to the flowing gaseous refrigerant a.

The liquid barrier 8 is connected to the top of the rear cover 6, which is the top of the tube and shell dry evaporator in the direction of gravity during operation. The liquid refrigerant A flowing into the chamber C from the upper heat exchange tube 2 is directly intercepted by the liquid baffle plate 8 on the windward side 10 and falls into the bottom of the barrel 1 along the windward side 10. And a part of the liquid refrigerant A flowing into the chamber C from the lower heat exchange tube 2 is directly retained at the bottom of the chamber C, and the other part of the liquid refrigerant A flows upwards to the leeward surface 11 of the liquid baffle plate 8 along with the gaseous refrigerant A, is intercepted by the liquid baffle plate 8 at the leeward surface 11, and finally falls into the bottom of the barrel 1 along the leeward surface 11. The liquid baffle plate 8 intercepts the liquid refrigerant A by utilizing the structure and the position relation of the liquid baffle plate, so that the gas-liquid separation of the refrigerant A on the outlet side of the shell-and-tube dry evaporator is realized when the water chilling unit is started, and the liquid impact of the compressor is reduced or avoided when the water chilling unit is started. In addition, during shutdown, part of the refrigerant a condenses and accumulates at the bottoms of the front and

rear covers

5 and 6. By fixing the end of the liquid baffle 8 to the top of the back cover 6, it is possible to make the refrigerant a accumulated at the bottom of the back cover 6 in a shutdown state less likely to be sucked into the suction pipe 12 after the compressor is started.

And a drainage plate 13 is arranged at one end of the liquid baffle plate 8, which is far away from the end fixedly connected with the rear cover 6, and the drainage plate 13 is arranged in parallel with the tube plate 4. In the present embodiment, the drainage plate 13 is disposed at the bottom of the liquid baffle 8, and the liquid refrigerant a intercepted by the liquid baffle 8 slides down to the drainage plate 13 along the liquid baffle 8 in an inclined manner, at this time, the component of gravity of the liquid refrigerant a is the largest, which helps the liquid refrigerant a slide down to the bottom of the chamber C from a specified position or range on the liquid baffle 8.

The liquid baffle plate 8 is in an irregular plate shape, the peripheral outline of the liquid baffle plate 8 is matched with the shape of the inner wall of the rear cover 6, so that liquid refrigerant A flowing out of the heat exchange tube 2 opposite to the liquid baffle plate 8 can be effectively intercepted, and the gas-liquid separation capacity of the liquid baffle plate 8 is improved.

One end of the air suction pipe 12 penetrating through the liquid baffle plate 8 is parallel to the plate surface of the liquid baffle plate 8, that is, one end of the air suction pipe 12 is on the same plane with the lee side 11 of the liquid baffle plate 8. Of course, in other embodiments, one end of the air suction pipe 12 may also protrude from the liquid baffle 8, that is, the air suction pipe may be disposed to protrude from the lee side 11 of the liquid baffle 8. Regardless of the form, as long as one end of the air suction pipe 12 is located on one side of the leeward surface 11 of the liquid baffle plate 8, the liquid baffle plate 8 can intercept the liquid refrigerant a, and the air suction pipe 12 can enter the liquid refrigerant a from the leeward surface 11 of the liquid baffle plate 8.

The tube shell dry-type evaporator is horizontal, the barrel 1 is horizontally placed, a chilled water inlet pipe 14 and a chilled water outlet pipe 15 are arranged on the side wall of the barrel 1, the chilled water inlet pipe 14 is arranged at the top and is close to the rear cover 6, and the chilled water outlet pipe 15 is arranged at the bottom and is close to the front cover 5. A plurality of baffles 16 are arranged in the cylinder 1 at intervals at the upper and lower parts of the cylinder 1. The chilled water B enters the interior of the cylinder body 1 from the chilled water inlet pipe 14 and moves along the baffle plate 16 in the interior of the cylinder body 1, exchanges heat with the refrigerant A in the heat exchange pipe 2 on the surface of the heat exchange pipe 2, and then is discharged from the chilled water outlet pipe 15.

Second embodiment

The second embodiment of the present invention provides a water chiller, which comprises a dry-type evaporator, wherein the part of the dry-type evaporator not specifically illustrated includes the same reference numerals and characters as the first embodiment, and the description thereof is omitted.

In a second embodiment of the present invention, as seen in fig. 5, the water chiller includes a compressor 17, a condenser 18, an expansion valve 19, and an evaporator 20, which are connected in this order and form a circulation circuit, and the evaporator 20 is a tube-in-tube dry evaporator 20 in the first embodiment. The refrigerant a circulates through the compressor 17, the condenser 18, the expansion valve 19, and the evaporator 20 in this order, and the chilled water B flows through the evaporator 20 and exchanges heat with the refrigerant a in the evaporator 20. As described above, in the evaporator 20 of the first embodiment, the liquid baffle 8 is used to intercept the liquid refrigerant a discharged from the heat exchange tube 2 into the chamber C, so as to effectively separate the liquid refrigerant a from the gas, thereby reducing or avoiding liquid impact of the compressor 17 when the compressor is started, preventing the compressor 17 from being easily broken down, and prolonging the service life of the compressor 17.

It will be appreciated by those of ordinary skill in the art that in the embodiments described above, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the invention.

Claims

1. A shell and tube dry evaporator comprising:

the tube plate is arranged at the end part of the heat exchange unit;

the outer edge part of the rear cover is fixedly connected with the tube plate, and the central part of the rear cover protrudes in the direction away from the tube plate, so that a chamber communicated with the heat exchange tube is formed between the rear cover and the tube plate;

an air intake duct communicating with the chamber;

it is characterized in that the tube and shell dry evaporator further comprises:

and the liquid baffle is positioned in the cavity and is arranged on the air suction path of the air suction pipe in a manner of facing the heat exchange pipe.

2. A shell and tube dry evaporator as set forth in claim 1 wherein said suction duct communicates with said chamber from a side of said liquid baffle facing said heat exchange tubes through holes in said liquid baffle.

3. A shell and tube dry evaporator according to claim 1, wherein the liquid baffle is inclined at an angle to the tube sheet.

4. A shell and tube dry evaporator as in claim 3, wherein the included angle is 25 ° to 45 °.

5. A shell and tube dry evaporator as in any one of claims 1-4, wherein one end of the liquid barrier is secured to the top of the back cover.

6. A shell and tube dry evaporator according to claim 5, wherein a flow guiding plate is arranged on the liquid baffle at the end remote from the end fixedly connected with the back cover, the flow guiding plate being arranged parallel to the tube sheet.

7. A shell and tube dry evaporator as in any one of claims 1-4 or 6, wherein the liquid baffle is contoured to match the shape of the inner wall of the back cover.

8. A shell and tube dry evaporator as set forth in claim 2 wherein said air suction tube extends through said liquid barrier at an end thereof parallel to or protruding from the surface of said liquid barrier.

9. A water chiller comprising a shell and tube dry evaporator according to any one of claims 1 to 8.