CN111174465A

CN111174465A - Evaporator and heat exchange system comprising same

Info

Publication number: CN111174465A
Application number: CN201811339080.8A
Authority: CN
Inventors: 程嫚; 马新; 周杰; 罗雄
Original assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Current assignee: Mcquay Air Conditioning and Refrigeration Wuhan Co Ltd
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2020-05-19

Abstract

The embodiment of the application provides an evaporimeter and contain heat transfer system of this evaporimeter, this evaporimeter has: an economizer disposed in the barrel, the economizer having a length direction parallel to an axial direction of the barrel, the economizer comprising: the refrigerant inlet, the gaseous refrigerant outlet and the liquid refrigerant outlet are distributed along the length direction of the economizer, and the gaseous refrigerant and the liquid refrigerant which are mixed are input into the cavity of the economizer from the refrigerant inlet and are separated into gaseous refrigerant and liquid refrigerant in the flowing process of the gaseous refrigerant outlet and the liquid refrigerant outlet. The embodiment is favorable for uniformly distributing the refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator and having compact structure.

Description

Evaporator and heat exchange system comprising same

Technical Field

The application relates to the technical field of air conditioning equipment, in particular to an evaporator and a heat exchange system comprising the same.

Background

With the increasing demands for energy conservation and environmental protection, research on water chilling units has been moving to the direction of high performance and low refrigerant charge. The flooded evaporator cannot effectively control the refrigerant filling amount of the unit on the premise of meeting the requirement of high performance; the falling film evaporator is widely applied to a central air-conditioning refrigerating unit, and the heat exchanger has the advantages of small refrigerant filling amount, compact structure, high heat transfer efficiency, stable heat exchange and the like.

Most of the traditional refrigerants used in the existing water chilling units are R134a, and the falling film evaporator is also designed based on the physical parameters of the refrigerant R134 a. Negative pressure refrigerants, such as R123, R1233zd, R1233ze, are increasingly used in the air conditioning industry due to their environmental protection and high efficiency.

Under typical working conditions (evaporation temperature 6 ℃, condensation temperature 37 ℃), the pressure difference between the condenser and the evaporator of the negative pressure refrigerant R1233zd (e) is only 23.1% of the pressure difference between the condenser and the evaporator of the refrigerant R134 a.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.

Disclosure of Invention

The inventor of the application finds that the negative pressure refrigerant is more prone to phase change due to smaller pressure difference, and the dryness of the refrigerant before entering the evaporator is increased, so that the performance of the evaporator is not improved; in addition, when the evaporation temperature is 6 ℃, the gas-phase density of the negative pressure refrigerant R1233zd (e) is 1/5 of that of R134a, so that when R1233zd (e) is used as the refrigerant, the volume flow rate of the gaseous refrigerant generated by throttling from the outlet of the condenser to the evaporator is far greater than that of the refrigerant R134a, which has a great influence on the uniform distribution of the refrigerant in the falling film evaporator, thereby influencing the heat exchange effect of the refrigerant. Therefore, not only is it necessary to perform gas-liquid separation for the negative pressure refrigerant entering the evaporator, but the gas-liquid separation is required to be higher than that of the conventional refrigerant.

The application provides an evaporator, and contain heat transfer system of this evaporator, set up the economic ware in the barrel of evaporator, this economic ware makes the gaseous state of input and the liquid refrigerant of liquid mixture separate liquid refrigerant at the in-process that flows along the length direction of economic ware, this liquid refrigerant is imported the distributor, be favorable to liquid refrigerant evenly distributed in the evaporator, thereby improve the heat transfer effect of evaporator, consequently, even adopt negative pressure refrigerants such as R1233zd (e), can not influence the heat transfer effect of refrigerant in the evaporator because gaseous refrigerant's volumetric flow is great yet, and, set up the economic ware in the barrel of evaporator, compact structure, occupation space is little, and convenient processing.

According to an aspect of an embodiment of the present application, there is provided an evaporator including: the evaporator comprises a cylinder, a refrigerant distributor and a heat exchange pipe, wherein the refrigerant distributor and the heat exchange pipe are arranged in the cylinder, the refrigerant distributor distributes a first refrigerant entering the evaporator, and the first refrigerant outside the heat exchange pipe exchanges heat with a second refrigerant inside the heat exchange pipe;

it is characterized in that the evaporator also comprises an economizer arranged in the cylinder body, the length direction of the economizer is parallel to the axial direction of the cylinder body,

the economizer comprises a cavity enclosed by a top part, a bottom part and two end plates positioned at two opposite end parts of the economizer along the length direction,

the economizer further comprises:

the refrigerant input port is used for inputting the first refrigerant mixed with gas and liquid into the cavity of the economizer;

a gaseous refrigerant outlet for outputting the gaseous first refrigerant from the economizer chamber; and

a liquid refrigerant outlet communicated with the refrigerant distributor for inputting the first refrigerant in liquid state to the refrigerant distributor,

the refrigerant input port, the gaseous refrigerant output port and the liquid refrigerant output port are distributed along the length direction of the economizer, and the gaseous and liquid mixed first refrigerant input into the cavity of the economizer from the refrigerant input port is separated into gaseous first refrigerant and liquid first refrigerant in the process of flowing to the gaseous refrigerant output port and the liquid refrigerant output port.

According to another aspect of an embodiment of the present application, wherein the economizer further comprises:

the first input buffer part is arranged in a cavity of the economizer, the refrigerant input port is arranged in the first input buffer part, and the input buffer part is provided with an outflow part for allowing the gaseous first refrigerant and the liquid first refrigerant to flow out of the accommodating space of the first input buffer part; and

at least two gas-liquid separation baffles arranged in the economizer cavity, wherein the gas-liquid separation baffles are provided with gas through holes for the gaseous first refrigerant to flow through, a gap for the liquid first refrigerant to flow through is arranged between the gas-liquid separation baffles and the bottom of the economizer, the at least two gas-liquid separation baffles are arranged between the first input buffer part and the gaseous refrigerant output port at intervals in the length direction of the economizer,

the gaseous first refrigerant and the liquid first refrigerant flowing out of the outflow portion flow through the at least two gas-liquid separation baffles and flow to the gaseous refrigerant outlet and the liquid refrigerant outlet.

According to another aspect of an embodiment of the present application, wherein, for the at least two gas-liquid separation baffles, the closer to the first input buffer in the length direction of the economizer, the larger the gap and/or the smaller the total area of the gas passing holes.

According to another aspect of an embodiment of the present application, wherein the gas passing holes of adjacent gas-liquid separating baffles do not coincide when viewed in a length direction of the economizer.

the filter screen is arranged between the gaseous refrigerant output port and the liquid refrigerant output port, and the gaseous first refrigerant is allowed to pass through the filter screen and flow to the gaseous refrigerant output port; and/or

And the liquid blocking box is arranged between the gaseous refrigerant output port and the filter screen and used for blocking the liquid first refrigerant from entering the gaseous refrigerant output port.

According to another aspect of the embodiments of the present application, wherein the liquid blocking tank has: the filter screen comprises a bottom surface facing the filter screen, two side walls which are connected with the bottom surface and parallel to the length direction of the economizer, an end surface facing one side of the refrigerant input port, and an open end part opposite to the end surface in the length direction;

wherein at least one of the two sidewalls is formed with a through-hole located at a position of the sidewall near the open end.

According to another aspect of the embodiment of the present application, the refrigerant inlet is formed in one of the end plates, and the outflow portion is a first multi-hole throttling baffle facing the top portion; or

The refrigerant input port is formed in the top, the outflow part is a second multi-hole throttling baffle facing the gas-liquid separation baffle, and a through hole is formed in the part, close to the top, of the second multi-hole throttling baffle.

According to another aspect of the embodiments of the present application, wherein the bottom of the cavity has a pair of protrusions extending toward the top when viewed in the length direction, the pair of protrusions are parallel, or a distance between the pair of protrusions decreases with a position farther from the top.

two opposing baffles having a gap between the two baffles and the bottom; and

a buffer plate located between the two baffles, the buffer plate being disposed facing the refrigerant inlet, the buffer plate having a plurality of openings,

wherein the number of the liquid refrigerant outlets is at least 2, the liquid refrigerant outlets are respectively positioned at two outer sides of the area between the two baffles in the length direction, the number of the gaseous refrigerant outlets is at least 2, the gaseous refrigerant outlets are respectively positioned at two outer sides of the area between the two baffles in the length direction,

the first refrigerant which is input from the refrigerant input port and is mixed in gas state and liquid state penetrates through the opening of the buffer plate and flows to the at least 2 liquid refrigerant output ports and the at least 2 gas refrigerant output ports from the gap between the baffle plate and the bottom.

and the filter screen is arranged between the gaseous refrigerant output port and the liquid refrigerant output port and allows the gaseous first refrigerant to pass through the filter screen and flow to the gaseous refrigerant output port.

According to another aspect of the embodiments of the present application, wherein the liquid blocking tank has: a bottom surface facing the strainer, two side walls connected to the bottom surface and parallel to a length direction of the economizer, an end surface facing one side of the baffle, and an open end opposite to the end surface in the length direction;

According to another aspect of an embodiment of the present application, wherein the top of the economizer is a portion of the barrel of the evaporator, and the bottom and the end plate are secured to the barrel by a sealed connection therewith.

According to another aspect of the embodiments of the present application, the top of the economizer is independent of the evaporator cylinder, and the bottom of the economizer is fixedly connected to the refrigerant distributor through a connecting member.

According to yet another aspect of an embodiment of the present application, there is provided a heat exchange system having an evaporator as described in any of the above embodiments.

The beneficial effect of this application lies in: the economizer is arranged in the evaporator barrel to separate liquid refrigerant, so that the liquid refrigerant exchanges heat in the evaporator, the liquid refrigerant is uniformly distributed, the heat exchange effect of the evaporator is improved, and the evaporator is compact in structure, small in occupied space and convenient to process.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic perspective view of an evaporator according to embodiment 1 of the present application;

FIG. 2 is a schematic view of an economizer of embodiment 1 of the present application;

FIG. 3 is another perspective view of the evaporator according to embodiment 1 of the present application;

FIG. 4 is another perspective view of the evaporator according to embodiment 1 of the present application;

FIG. 5 is a schematic view of an economizer in the evaporator of FIG. 4;

FIG. 6 is a schematic perspective view of an evaporator according to embodiment 2 of the present application;

FIG. 7 is a perspective view of the economizer of embodiment 2 of the present application;

FIG. 8 is another perspective view of the evaporator according to embodiment 2 of the present application;

FIG. 9 is a schematic view of a heat exchange system of example 3 of the present application.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In the following description of the present application, for the sake of convenience of description, a direction extending about a central axis of the evaporator tube is referred to as an "axial direction", a radial direction about the axis is referred to as a "radial direction", and a circumferential direction about the axis is referred to as a "circumferential direction". A direction directed from the economizer to the distributor is referred to as a "lower direction", a direction opposite to the "lower direction" is an "upper direction", and a side of each component of the evaporator and the economizer facing the "upper direction" is referred to as an "upper side", and a side opposite to the upper side is referred to as a "lower side". The above definitions of the upper direction, the lower direction, the upper side and the lower side are only for convenience of description, and do not limit the orientation of the evaporator in use.

Example 1

The embodiment of the application provides an evaporator, and fig. 1 is a schematic perspective view of the evaporator of the embodiment.

As shown in fig. 1, the evaporator 1 includes: the heat exchanger comprises a cylinder 10, a refrigerant distributor 11 and a heat exchange tube 12, wherein the refrigerant distributor 11 and the heat exchange tube 12 are arranged in the cylinder 10.

In the present embodiment, the refrigerant distributor 11 distributes the liquid first refrigerant entering the evaporator 1, so as to uniformly distribute the first refrigerant to the outside of the heat exchange tubes 12, wherein the refrigerant distributor 11 may be a gravity distributor or a pressure distributor. The heat exchange tube 12 may be located below the refrigerant distributor 11, a first refrigerant outside the heat exchange tube 12 exchanges heat with a second refrigerant inside the heat exchange tube 12, and the liquid first refrigerant absorbs heat and becomes a gas, and is output from the suction port 13 of the evaporator. The heat exchange tubes 12 may be provided in plural numbers and formed as a heat exchange tube bundle.

As shown in fig. 1, the evaporator 1 further includes an economizer 20 disposed within the drum 10. The economizer 20 has a longitudinal direction L parallel to the axis X of the barrel 10.

As shown in fig. 1, the economizer 20 can include a chamber a bounded by a top 21, a bottom 22, and two

end plates

23,24 located at opposite ends of the economizer 20 along its length.

As shown in fig. 1, the economizer 20 may further include: a refrigerant inlet 25, a gaseous refrigerant outlet 26, and a liquid refrigerant outlet 27.

The refrigerant inlet 25 is used for inputting a first refrigerant mixed with gas and liquid into the cavity a of the economizer 20; the gaseous refrigerant outlet 26 is used for outputting a gaseous first refrigerant from the cavity a of the economizer 20; the liquid refrigerant outlet 27 may be in communication with the refrigerant distributor 11, and is configured to input the liquid first refrigerant to the refrigerant distributor 11.

In the present embodiment, the refrigerant inlet 25, the gaseous refrigerant outlet 26, and the liquid refrigerant outlet 27 are distributed along the length direction L of the economizer 20, and the first refrigerant, which is a mixture of a gaseous refrigerant and a liquid refrigerant and is input from the refrigerant inlet 25 into the cavity a of the economizer 20, is separated into the first refrigerant in a gaseous state and the first refrigerant in a liquid state while flowing to the gaseous refrigerant outlet 26 and the liquid refrigerant outlet 27, so that the first refrigerant in a liquid state is output from the liquid refrigerant outlet 27 to the distributor 11, and the first refrigerant in a gaseous state is output from the gaseous refrigerant outlet 26 to the outside of the cavity a.

According to the embodiment, the economizer is arranged in the barrel of the evaporator, the economizer enables the input gas-state and liquid-state mixed refrigerant to separate the liquid-state refrigerant in the process of flowing along the length direction of the economizer, the liquid-state refrigerant is input into the distributor, and the uniform distribution of the liquid-state refrigerant in the evaporator is facilitated, so that the heat exchange effect of the evaporator is improved, and therefore, even if negative-pressure refrigerants such as R1233zd (e) and the like are adopted, the heat exchange effect of the refrigerant in the evaporator cannot be influenced due to the large volume flow rate of the gas-state refrigerant; in addition, the length direction of the economizer is large, so that the refrigerant mixed with gas and liquid can be fully separated in the process of flowing along the length direction of the economizer; in addition, an economizer is arranged in the barrel of the evaporator, so that the evaporator is compact in structure, small in occupied space and convenient to process.

Fig. 2 is a schematic view of the economizer of this embodiment. In fig. 2, only the economizer 20 is shown, and other components of the evaporator 1 are not shown.

As shown in fig. 2, the economizer 20 may further include a first input buffer 28 and at least two gas-liquid separation baffles 29.

As shown in fig. 2, the first input buffer 28 may be disposed in the cavity a of the economizer, and the refrigerant input port 25 may be disposed in the first input buffer 28. The first input buffer portion 28 may have an outflow portion 281 for allowing the gaseous first refrigerant and the liquid first refrigerant to flow out of the receiving space of the first input buffer portion 28. Thus, the first input buffer 28 may generate an effect of depressurizing the first refrigerant of the gas and liquid mixture input to the economizer 20.

For example, the first input buffer 28 may be an inverted trapezoidal box shape, for example, having an upper top cross-sectional dimension greater than a lower bottom cross-sectional dimension, which may be welded to the bottom 22 and the end plate 23 of the economizer 1, and further, having a lower bottom and side walls that may be part of the bottom 22 and the end plate 23 of the economizer 1; the upper top of the inverted trapezoid box-shaped box can be formed with a plurality of openings for the outflow of the first refrigerant mixed with gas and liquid, so that the upper top of the inverted trapezoid box-shaped box can be formed with a first porous throttling baffle, thereby exerting the function of the outflow portion 281.

As shown in fig. 2, the at least two gas-liquid separation baffles 29 (e.g., 29a, 29b, 29c, 29d) may be disposed within the cavity a of the economizer. Each of the gas-

liquid separation baffles

29a, 29b, 29c, and 29d may have a gas passing hole 291 through which the gaseous first refrigerant flows, and a gap 292 through which the liquid first refrigerant flows may be provided between the gas-liquid separation baffle 29 and the bottom 22 of the economizer 20.

As shown in fig. 2, the at least two gas-liquid separation baffles 29 are disposed between the first input buffer portion 28 and the gaseous refrigerant output port 26 at intervals in the longitudinal direction of the economizer 20. Accordingly, the first refrigerant in the gas state and the first refrigerant in the liquid state flowing out of the outflow portion 281 may flow through the at least two gas-liquid separation baffles 29 and flow to the gas refrigerant outlet 26 and the liquid refrigerant outlet 27.

In the present embodiment, the gas-liquid separation baffle 29 may be fixed to the inner wall of the economizer 20, for example, a portion of the gas-liquid separation baffle 29 contacting the inner wall of the economizer 20 may be fixed by welding or other sealing connection.

In the present embodiment, as shown in fig. 2, the gap 292 may be larger for the at least two gas-liquid separation baffles 29 as closer to the first input buffer portion 28 in the lengthwise direction of the economizer 20. Since the amount of the liquid first refrigerant increases as the first input buffer portion 28 is closer, the larger the gap 292 is, the flow of the liquid first refrigerant can be facilitated. In addition, the present embodiment is not limited to this, and the gaps 292 of the gas-liquid separation baffles 29 may be equal.

In the present embodiment, as shown in fig. 2, with the at least two gas-liquid separation baffles 29, the total area of the gas passing holes 291 may be smaller the closer to the first input buffer portion 28 in the length direction of the economizer 20. Since the amount of the gaseous first refrigerant is smaller as the first input buffer 28 is closer, the total area of the gas passage holes 291 is larger, and the flow rate of the gaseous first refrigerant can be matched. In addition, the present embodiment is not limited to this, and the total area of the gas passing holes 291 of the gas-liquid separation baffles 29 may be equal.

In the present embodiment, as shown in fig. 2, the gas passing holes 291 of the adjacent gas-liquid separation baffles 29, such as the gas-liquid separation baffles 29a and 29b, the gas-liquid separation baffles 29b and 29c, do not overlap when viewed in the length L direction of the economizer 20. This can prevent the gaseous first refrigerant from flowing in the longitudinal direction L, thereby improving the gas-liquid separation effect.

In the present embodiment, the process of the first refrigerant in the gas-liquid mixture flowing through each gas-liquid separation baffle 29 is as follows: the gas-liquid separation baffle 29 collides with the first refrigerant mixed in gas state and liquid state, the gas refrigerant with light mass flows into the next-stage separation space from the gas through hole 291 on the upper part of the baffle, the liquid refrigerant with heavy mass falls to the bottom of the economizer under the action of gravity, flows into the next-stage separation space from the gap 292 between the gas-liquid separation baffle 29 and the bottom 22 of the economizer, and the first refrigerant mixed in gas state and liquid state is separated into the gas refrigerant and the mixed refrigerant with lower dryness after multiple times of separation.

In this embodiment, as shown in fig. 2, the economizer 20 may further have at least one of a strainer 31 and a liquid-blocking box 32.

The filter screen 31 may be disposed between the gaseous refrigerant outlet 26 and the liquid refrigerant outlet 27, and the filter screen 31 may allow the gaseous first refrigerant to pass through and flow to the gaseous refrigerant outlet 26, and prevent the gaseous first refrigerant from bringing the liquid first refrigerant with a smaller diameter to the gaseous refrigerant outlet 26.

As shown in fig. 2, the liquid blocking box 32 is disposed between the gaseous refrigerant outlet 26 and the filter screen 31, and is used for blocking the liquid first refrigerant from entering the gaseous refrigerant outlet 26. Among them, the liquid blocking box 32 may have: a bottom 321 facing the screen 31, two side walls 322 connected to the bottom and parallel to the length L direction of the economizer 20, an end face 323 facing the refrigerant inlet 25 side, and an open end 324 opposite to the end face 323 in the length L direction. The two side walls 322 and the end face 323 of the liquid trap 32 may be welded to the ceiling 21 of the economizer 20, and the gaseous refrigerant outlet 26 may be surrounded by the two side walls 322 and the end face 323 of the liquid trap 32. Further, the bottom surface 321 and the end surface 323 may not have openings. Thus, the gaseous first refrigerant can enter the liquid baffle 32 from the open end 324 of the liquid baffle 32 and flow to the gaseous refrigerant outlet 26.

As shown in fig. 2, at least one of the two sidewalls 322 may be formed with a through hole 3221, the through hole 3221 may be located near the open end 324 of the sidewall 322, and the number of the through holes 3221 may be more than one, and the through holes function to reduce the pressure of the gaseous first cooling medium in the liquid blocking box 32.

In the present embodiment, as shown in fig. 2, the refrigerant inlet 25 is formed in one end plate 23 of the economizer, and as described above, the outflow portion 281 of the first buffer portion 28 is a first porous throttle flapper facing the top portion 22 (not shown in fig. 2).

Fig. 3 is another perspective view of the evaporator according to the embodiment, and as shown in fig. 3, the refrigerant inlet 25 of the economizer 20 may be formed at the top 21 of the economizer 20, and the outflow portion 281 of the first buffer portion 28 may be a second porous throttling baffle 281a facing the gas-liquid separating baffle 29, and a portion of the second porous throttling baffle 281a near the top 21 may have a through hole 281a1, so that the first refrigerant mixed with gas and liquid may flow out of the first buffer portion 28 from the through hole 281a1 and flow to the gas-liquid separating baffle 29.

In the present embodiment, as shown in fig. 2, the bottom 22 of the cavity a may have a pair of

protrusions

33 and 34 extending toward the top 21 when viewed in the length L direction, and the distance between the pair of

protrusions

33 and 34 may decrease as the position is farther from the top 21, whereby the bottom 22 of the cavity a may be formed in an inverted trapezoid shape having a wide upper portion and a narrow lower portion. Therefore, the inverted trapezoidal bottom 22 can form a larger upper gas fluid space and a smaller bottom liquid refrigerant space, the flow rate of the gaseous refrigerant can be effectively reduced, a higher liquid level is formed, and a liquid seal is formed at the bottom of the gas-liquid separation plate baffle 29, so that the gaseous refrigerant of the previous stage is prevented from flowing away from the gap 292, the flow rate of the liquid refrigerant is improved, and the gaseous refrigerant flows out from the liquid refrigerant outlet 27 and enters the distributor.

Further, the present embodiment may not be limited thereto, and the pair of

protrusions

33 and 34 of the bottom 22 of the cavity a may be parallel when viewed in the length L direction, thereby being formed in a rectangular shape.

In addition, in the present embodiment, the liquid refrigerant outlet 27 may further be provided with a swirl baffle (not shown), so as to reduce the speed of the liquid first refrigerant flowing out of the outlet 27.

In the present embodiment, as shown in fig. 1, the top 21 of the economizer 20 may be a part of the drum 10 of the evaporator 1, and the bottom 22 and the

end plates

23,24 of the economizer 20 may be fixed to the drum 10 by a sealing connection with the drum 10. The sealing connection may be, for example, a weld or the like.

In another embodiment, the top 21 of the economizer 20 may be independent of the evaporator cylinder 10, and the bottom 22 of the economizer 20 may be fixedly coupled to the refrigerant distributor 12 by a coupling member, thereby securing the economizer 20 to the refrigerant distributor 12. In addition, the refrigerant distributor 12 may be placed on the heat exchange tube supporting plate, and supported by the supporting plate. Therefore, the position of the economizer 20 in the evaporator cylinder is flexible, and the position of the air inlet of the evaporator is not limited by the structure of the economizer, for example, the air inlet can be arranged right above the center of the evaporator cylinder, and can also be arranged at other positions of the evaporator cylinder.

Fig. 4 is another perspective view of the evaporator of the present embodiment, and fig. 5 is a schematic view of an economizer in the evaporator of fig. 4. As shown in fig. 4 and 5, the top 21 of the economizer 20 is independent of the evaporator barrel 10, whereby the economizer 20 can be a stand-alone cartridge. The bottom 22 of the economizer 20 may be fixedly coupled to the refrigerant distributor 12 by a coupling member 35 (shown in fig. 5), and the economizer 20 may be fixed to the refrigerant distributor 11, wherein the coupling member 35 may be, for example, an angle steel to which both the bottom 22 of the economizer 20 and the refrigerant distributor 11 may be welded.

Further, as shown in fig. 5, the pair of

projections

33 and 34 of the bottom 22 of the cavity a are parallel when viewed in the length L direction, thereby being formed in a rectangular shape.

According to the embodiment, the economizer is arranged in the barrel of the evaporator, the economizer enables the input gas-state and liquid-state mixed refrigerant to separate the liquid-state refrigerant in the process of flowing along the length direction of the economizer, the liquid-state refrigerant is input into the distributor, and the liquid-state refrigerant is favorably and uniformly distributed in the evaporator, so that the heat exchange effect of the evaporator is improved, and therefore, even if the negative-pressure refrigerant is adopted, the heat exchange effect of the refrigerant in the evaporator cannot be influenced due to the large volume flow of the gas-state refrigerant; in addition, the length direction of the economizer is large, so that the refrigerant mixed with gas and liquid can be fully separated in the process of flowing along the length direction of the economizer; in addition, an economizer is arranged in the barrel of the evaporator, so that the evaporator is compact in structure, small in occupied space and convenient to process.

Example 2

Example 2 provides an evaporator as a modification of the evaporator of example 1.

In embodiment 2, the structure of the evaporator is different from that of embodiment 1.

Fig. 6 is a schematic perspective view of the evaporator of the present embodiment.

As shown in fig. 6, the evaporator 1 includes: the heat exchanger comprises a cylinder 10, a refrigerant distributor 11 and a heat exchange tube 12, wherein the refrigerant distributor 11 and the heat exchange tube 12 are arranged in the cylinder 10.

In the present embodiment, the refrigerant distributor 11 distributes the liquid first refrigerant entering the evaporator 1, so as to uniformly distribute the first refrigerant to the outside of the heat exchange tubes 12, wherein the refrigerant distributor 11 may be a gravity distributor or a pressure distributor. The heat exchange tube 12 may be located below the refrigerant distributor 11, a first refrigerant outside the heat exchange tube 12 exchanges heat with a second refrigerant inside the heat exchange tube 12, and the liquid first refrigerant absorbs heat and becomes a gas, and is output from the suction port 13 of the evaporator 1. The heat exchange tubes 12 may be provided in plural numbers and formed as a heat exchange tube bundle.

As shown in fig. 6, the evaporator 1 further includes an economizer 20 disposed in the drum 10. The economizer 20 has a longitudinal direction L parallel to the axis X of the barrel 10.

As shown in fig. 6, the economizer 20 can include a chamber a bounded by a top 21, a bottom 22, and two

end plates

23,24 located at opposite ends of the economizer 20 along its length.

As shown in fig. 6, the economizer 20 may further include: a refrigerant inlet 25, a gaseous refrigerant outlet 26, and a liquid refrigerant outlet 27.

Fig. 7 is a perspective view of the economizer of embodiment 2. As shown in fig. 7, the economizer 20 further includes: two opposing

baffle plates

71,72 and a buffer plate 73.

Wherein, the two

baffles

71 and 72 are spaced from the bottom 22 of the economizer 20 to allow the liquid first refrigerant to flow therethrough.

A buffer plate 73 may be positioned between the two

baffles

71 and 72, the buffer plate 73 being disposed to face the refrigerant inlet 25, and the buffer plate 73 may have a plurality of openings 731, whereby the first refrigerant of a mixture of liquid and gas may be decelerated by passing through the buffer plate 73.

As shown in fig. 7, the number of the liquid refrigerant discharge ports 27 is at least 2, and the liquid refrigerant discharge ports are located on both outer sides of the region between the two

baffles

71 and 72 in the length L direction. Further, the number of the gaseous refrigerant outlet ports 26 may be at least 2, and the gaseous refrigerant outlet ports are located on both outer sides of the region between the two

baffle plates

71 and 72 in the length L direction, respectively.

In this embodiment, the first refrigerant of the mixture of gas and liquid inputted from the refrigerant input port 25 may pass through the opening 731 of the buffer plate 73 and flow from the gap between the

baffle plates

71 and 72 and the bottom 22 to the at least 2 liquid refrigerant output ports 27 and the at least 2 gaseous refrigerant output ports 26.

In the present embodiment, as shown in fig. 7, the economizer 20 further includes: a screen 74. The filter 74 may be disposed between the gaseous refrigerant outlet 26 and the liquid refrigerant outlet 27, allowing the gaseous first refrigerant to flow through the filter 74 to the gaseous refrigerant outlet 26.

In fig. 6, the economizer 20 can have a back plate 75, whereby the economizer 20 has a fan shape when viewed along the length direction L. The suction port 13 of the evaporator may be located outside the back plate 75.

Fig. 8 is another perspective view of the evaporator of the present embodiment, and as shown in fig. 8, the economizer 20 does not have the back plate 75, and thus, the economizer 20 has a semicircular shape when viewed in the length direction L. In fig. 8, the inlet 13 of the evaporator may be located outside the economizer 20 in the longitudinal direction.

As shown in fig. 8, the economizer 20 may also have a liquid trap 76. The liquid blocking box 76 may be disposed between the gaseous refrigerant outlet 26 and the filter 74 to block the liquid first refrigerant from entering the gaseous refrigerant outlet 26.

As shown in fig. 8, the liquid blocking tank 76 includes: a bottom surface 761 facing the screen 74, two side walls 762,763 connected to the bottom surface 761 and parallel to the length direction of the economizer, an end surface 764 facing one side of the

baffle

71,72, and an open end 765 opposite to the end surface 764 in the length direction.

As shown in fig. 8, at least one of the two sidewalls 762,763 is formed with a through-hole 762a, the through-hole 762a being located at a position of the sidewall near the open end 765.

In this embodiment, the two sidewalls 762,763 and the end face 764 of the baffle box 76 may be welded to the top 21 (not shown in fig. 8) of the economizer 20, and the gaseous refrigerant outlet 26 may be surrounded by the two sidewalls 762,763 and the end face 764 of the baffle box 76. In addition, bottom surface 761 and end surface 764 may be devoid of openings. Thus, the gaseous first refrigerant may enter the liquid baffle 76 from the open end 765 of the liquid baffle 76 and flow to the gaseous refrigerant outlet 26. The through holes 762a also function to reduce the pressure of the gaseous first refrigerant in the liquid blocking box 76.

In the present embodiment, as shown in fig. 6, the top 21 of the economizer 20 may be a part of the drum 10 of the evaporator 1, and the bottom 22 and the

end plates

In another embodiment, the top 21 of the economizer 20 may be independent of the evaporator cylinder 10, and the bottom 22 of the economizer 20 may be fixedly connected to the refrigerant distributor 12 by a connecting member, such as an angle steel, to which both the bottom 22 of the economizer 20 and the refrigerant distributor 12 may be welded, to thereby fix the economizer 20 to the refrigerant distributor 12. In addition, the refrigerant distributor 12 may be placed on the heat exchange tube supporting plate, and supported by the supporting plate. Therefore, the position of the economizer 20 in the evaporator cylinder 10 is flexible, and the position of the evaporator air inlet 13 is not limited by the structure of the economizer 20, and the economizer can be arranged right above the center of the evaporator cylinder or at other positions of the evaporator cylinder.

Example 3

Embodiment 3 of the present application provides a heat exchange system including the evaporator described in embodiment 1 or embodiment 2.

FIG. 9 is a schematic view of a heat exchange system of example 3 of the present application. As shown in fig. 9, the heat exchange system 90 may be a two-stage compression refrigeration system.

As shown in fig. 9, the economizer 20 is built in the barrel of the evaporator 1, and the evaporator 1 is a falling film evaporator. An inlet 25 of the economizer 20 is connected with a liquid outlet at the bottom of the condenser 91, and a pore plate is arranged on a connecting pipeline between the economizer 20 and the liquid outlet at the bottom of the condenser 91 so as to throttle the refrigerant. After the gas-liquid separation in the economizer 20, the gaseous refrigerant outlet 26 is directly connected to the secondary suction port of the compressor 92, and the liquid refrigerant outlet 27 is connected to the distributor 12 inside the evaporator for refrigerant distribution. The evaporator suction port 13 is connected to the primary suction port of the compressor 92. The heat exchange system 90 has a simple and clear structure and strong practicability.

Similarly, for a refrigeration system with more than two-stage compression, a multi-stage throttle baffle and a plurality of gaseous refrigerant outlets can be designed in the economizer to realize multi-stage air supplement of the compressor.

In addition, for non-multi-stage compression systems, the gaseous refrigerant outlet 26 of the economizer 20 may be connected directly to the evaporator suction port 13 and throttled down by a throttle orifice or throttle valve to equalize the pressure between the two circuits.

Thus, the evaporator 1 of the present application with the built-in economizer 20 can be applied to both a refrigeration system of multi-stage (two-stage or more than two-stage) compression and a refrigeration system of non-multi-stage compression.

In this embodiment, owing to adopted the evaporimeter of this application, this heat exchange system's heat exchange efficiency improves to, be favorable to the use of negative pressure refrigerant in heat exchange system.

The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.

Claims

1. An evaporator (1) comprising: the evaporator comprises a cylinder (10), and a refrigerant distributor (11) and a heat exchange tube (12) which are arranged in the cylinder (10), wherein the refrigerant distributor (11) distributes a first refrigerant entering the evaporator (1), and the first refrigerant outside the heat exchange tube (12) exchanges heat with a second refrigerant in the heat exchange tube (12);

characterized in that the evaporator (1) also comprises an economizer (20) arranged in the cylinder (10), the length direction of the economizer (20) is parallel to the axial direction of the cylinder (10),

the economizer (20) comprises a cavity enclosed by a top part (21), a bottom part (22) and two end plates (23,24) positioned at two opposite ends of the economizer (20) along the length direction,

the economizer (20) further comprising:

a refrigerant inlet (25) for inputting the first refrigerant in a mixture of gaseous and liquid states into the cavity of the economizer (20);

a gaseous refrigerant outlet (26) for outputting the first refrigerant in a gaseous state from a cavity of the economizer (20); and

a liquid refrigerant outlet (27) communicated with the refrigerant distributor (11) for outputting the first refrigerant in a liquid state to the refrigerant distributor (11),

the refrigerant inlet (25), the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27) are distributed along the length direction of the economizer (20), and the gaseous refrigerant and the liquid refrigerant which are mixed in the cavity of the economizer (20) are input from the refrigerant inlet (25) and are separated into the gaseous refrigerant and the liquid refrigerant in the flowing process of the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27).

2. The evaporator as recited in claim 1, wherein said economizer (20) further comprises:

a first input buffer portion (28) disposed in the cavity of the economizer (20), wherein the refrigerant input port (25) is disposed in the first input buffer portion (28), and the first input buffer portion (28) has an outflow portion (281) through which the gaseous first refrigerant and the liquid first refrigerant flow out of the accommodating space of the first input buffer portion (28); and

at least two gas-liquid separation baffles (29) arranged in the cavity of the economizer (20), wherein the gas-liquid separation baffles (29) are provided with gas passing holes (291) for the gaseous first refrigerant to flow through, a gap (292) for the liquid first refrigerant to flow through is arranged between the gas-liquid separation baffles (29) and the bottom (22) of the economizer, the at least two gas-liquid separation baffles (29) are arranged between the first input buffer part (28) and the gaseous refrigerant output port (26) at intervals in the length direction of the economizer (20),

wherein the first refrigerant in a gas state and the first refrigerant in a liquid state flowing out of the outflow portion 281 flow through the at least two gas-liquid separation baffles 29 and flow to the gas refrigerant outlet 26 and the liquid refrigerant outlet 27.

3. The evaporator of claim 2,

for the at least two gas-liquid separation baffles (29), the closer to the first input buffer (28) in the length direction of the economizer (20), the larger the gap (292) and/or the smaller the total area of the gas passing holes (291).

4. The evaporator of claim 2,

the gas passing holes (291) of adjacent gas-liquid separation baffles (29) do not coincide when viewed in the longitudinal direction of the economizer (20).

5. The evaporator as recited in claim 2, wherein said economizer (20) further comprises:

a filter screen (31) disposed between the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27) for allowing the gaseous first refrigerant to flow to the gaseous refrigerant outlet (26) through the filter screen (31); and/or

And the liquid blocking box (32) is arranged between the gaseous refrigerant output port (26) and the filter screen (31) and is used for blocking the liquid first refrigerant from entering the gaseous refrigerant output port (26).

6. The evaporator of claim 5,

the liquid blocking box (32) comprises: a bottom surface (321) facing the filter screen (31), two side walls (322) connected to the bottom surface (321) and parallel to a longitudinal direction of the economizer (20), an end surface (323) facing one side of the refrigerant inlet port (25), and an open end portion (324) opposite to the end surface (323) in the longitudinal direction;

wherein at least one of the two sidewalls (322) is formed with a through hole (3221), the through hole (3221) being located at a position of the sidewall near the open end (324).

7. The evaporator of claim 2,

the refrigerant inlet (25) is formed in one of the end plates (23,24), and the outflow portion (281) is a first multi-hole throttling baffle plate facing the top portion (21); or

The refrigerant inlet (25) is formed in the ceiling portion (21), the outflow portion (281) is a second multi-hole throttle screen (281a) facing the gas-liquid separation screen (29), and a portion of the second multi-hole throttle screen (281a) near the ceiling portion (21) has a through hole (281a 1).

8. The evaporator of claim 2,

the bottom (22) of the cavity has a pair of protrusions (33,34) extending toward the top (21) when viewed in the length direction, the pair of protrusions (33,34) being parallel, or the distance between the pair of protrusions (33,34) is smaller as the distance from the top (21) is farther.

9. The evaporator as recited in claim 1, wherein said economizer (20) further comprises:

two opposing baffles (71,72), the two baffles (71,72) having a gap with the bottom (22); and

a buffer plate (73) located between the two baffles (71,72), the buffer plate (73) being disposed facing the refrigerant inlet port (25), the buffer plate (73) having a plurality of openings (731),

wherein the number of the liquid refrigerant outlets (27) is at least 2, the liquid refrigerant outlets are respectively positioned at two outer sides of the area between the two baffles (71,72) in the length direction, the number of the gaseous refrigerant outlets (26) is at least 2, the gaseous refrigerant outlets are respectively positioned at two outer sides of the area between the two baffles (71,72) in the length direction,

the first refrigerant, which is a mixture of gas and liquid, input from the refrigerant input port (25) passes through the opening (731) of the buffer plate (73) and flows from a gap between the baffle plate (71,72) and the bottom (22) to the at least 2 liquid refrigerant output ports (27) and the at least 2 gaseous refrigerant output ports (26).

10. The evaporator as recited in claim 9, wherein said economizer (20) further comprises:

a filter (74) disposed between the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27) to allow the gaseous first refrigerant to flow through the filter (74) to the gaseous refrigerant outlet (26).

11. The evaporator of claim 10, wherein the economizer further comprises:

and the liquid blocking box (76) is arranged between the gaseous refrigerant output port (26) and the filter screen (74) and is used for blocking the liquid first refrigerant from entering the gaseous refrigerant output port (26).

12. The evaporator of claim 11,

the liquid blocking box (76) has: a bottom surface (761) facing the screen (74), two side walls (762,763) connected to the bottom surface (761) and parallel to a length direction of the economizer (20), an end surface (764) facing a side of the baffle (71,72), and an open end (765) opposite the end surface (764) in the length direction;

wherein at least one of the two side walls (762,763) is formed with a through-hole (762a), the through-hole (762a) being located at a position of the side wall near the open end (765).

13. An evaporator according to any one of claim 1 to claim 12,

the top (21) of the economizer (20) is part of the barrel (10) of the evaporator (1), and the bottom (22) and the end plates (23,24) are fixed to the barrel (10) by a sealed connection with the barrel (10).

14. An evaporator according to any one of claim 1 to claim 12,

the top (21) of the economizer (20) is independent of the barrel (10) of the evaporator (1), and the bottom (22) is fixedly connected with the refrigerant distributor (11) through a connecting part (8).

15. A heat exchange system (90), characterized in that the heat exchange system (90) has an evaporator (1) according to any of claims 1-14.