Evaporator and heat exchange system including the evaporator

Abstract

The embodiment of the present application provides an evaporator and a heat exchange system including the evaporator, the evaporator has: an economizer arranged in a cylinder, the length direction of the economizer is parallel to the axial direction of the cylinder, the economizer has: a refrigerant input port, a gaseous refrigerant output port, and a liquid refrigerant output port, wherein 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 first refrigerant mixed with gas and liquid in the cavity of the economizer input from the refrigerant input port is separated into the first refrigerant in gaseous state and the first refrigerant in liquid state during the process of flowing to the gaseous refrigerant output port and the liquid refrigerant output port. This embodiment is conducive to uniform distribution of refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator, and has a compact structure.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning equipment, and in particular to an evaporator and a heat exchange system including the evaporator. Background Art

[0002] With the increasing demand for energy saving and environmental protection, the research on chillers has turned to high performance and low refrigerant charge. The full-liquid evaporator cannot effectively control the refrigerant charge of the unit under the premise of meeting high performance; the falling film evaporator is now widely used in central air-conditioning refrigeration units. This type of heat exchanger has the advantages of low refrigerant charge, compact structure, high heat transfer efficiency, and stable heat exchange.

[0003] Most of the existing chillers use the traditional refrigerant R134a, and the falling film evaporator is also designed based on the physical parameters of the refrigerant R134a. Negative pressure refrigerants, such as R123, R1233zd, and R1233ze, are increasingly being used in the air conditioning industry due to their environmental protection and high efficiency.

[0004] Under typical operating conditions (evaporating temperature 6°C, condensing temperature 37°C), the pressure difference between the condenser and evaporator of the negative pressure refrigerant R1233zd(e) is only 23.1% of the pressure difference between the condenser and evaporator of the refrigerant R134a.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The inventor of the present application found that negative pressure refrigerant is more prone to phase change due to the smaller pressure difference, and the dryness of the refrigerant before entering the evaporator increases, which is not conducive to the improvement of evaporator performance; in addition, when the evaporation temperature is 6°C, the gas phase density of the negative pressure refrigerant R1233zd(e) is 1 / 5 of that of R134a. Therefore, when R1233zd(e) is used as the refrigerant, the volume flow rate of the gaseous refrigerant generated by throttling from the condenser outlet to the evaporator is much larger than that of the refrigerant R134a, which will have a greater impact on the uniform distribution of the refrigerant in the falling film evaporator, thereby affecting the heat exchange effect of the refrigerant. Therefore, for the negative pressure refrigerant entering the evaporator, it is not only necessary to perform gas-liquid separation, but also the requirements for the gas-liquid separation are higher than those for traditional refrigerants.

[0007] The present application provides an evaporator and a heat exchange system including the evaporator. An economizer is arranged in the cylinder of the evaporator. The economizer separates the liquid refrigerant from the mixed gaseous and liquid refrigerant inputted during the flow along the length direction of the economizer. The liquid refrigerant is inputted into a distributor, which is beneficial to the uniform distribution of the liquid refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator. Therefore, even if negative pressure refrigerant such as R1233zd(e) is used, the heat exchange effect of the refrigerant in the evaporator will not be affected due to the large volume flow rate of the gaseous refrigerant. In addition, the economizer is arranged in the cylinder of the evaporator, which has a compact structure, occupies a small space, and is easy to process.

[0008] According to one aspect of an embodiment of the present application, an evaporator is provided, comprising: a cylinder, and a refrigerant distributor and a heat exchange tube disposed in the cylinder, wherein the refrigerant distributor distributes a first refrigerant entering the evaporator, and the first refrigerant outside the heat exchange tube performs heat exchange with a second refrigerant inside the heat exchange tube;

[0009] The evaporator further comprises an economizer disposed in the cylinder, and the length direction of the economizer is parallel to the axial direction of the cylinder.

[0010] The economizer includes a cavity enclosed by a top, a bottom, and two end plates located at two opposite ends of the economizer along the length direction.

[0011] The economizer also includes:

[0012] A refrigerant input port, used for inputting the first refrigerant mixed in gaseous and liquid states into the cavity of the economizer;

[0013] a gaseous refrigerant outlet, used to output the first refrigerant in a gaseous state from the cavity of the economizer; and

[0014] a liquid refrigerant outlet, which is connected to the refrigerant distributor and is used to input the first refrigerant in liquid form into the refrigerant distributor,

[0015] The refrigerant input port, the gaseous refrigerant output port, and the liquid refrigerant output port are distributed along the length direction of the economizer. The gaseous and liquid mixed first refrigerant input from the refrigerant input port into the cavity of the economizer is separated into the gaseous first refrigerant and the liquid first refrigerant in the process of flowing toward the gaseous refrigerant output port and the liquid refrigerant output port.

[0016] According to another aspect of the embodiment of the present application, the economizer further comprises:

[0017] A first input buffer portion is disposed in the cavity of the economizer, the refrigerant input port is disposed in the first input buffer portion, and the input buffer portion has an outflow portion for the first refrigerant in a gas state and the first refrigerant in a liquid state to flow out from the accommodating space of the first input buffer portion; and

[0018] At least two gas-liquid separation baffles are arranged in the economizer cavity, the gas-liquid separation baffles have a gas passage hole for the gaseous first refrigerant to flow through, a gap for the liquid first refrigerant to flow through is provided between the gas-liquid separation baffle and the bottom of the economizer, and the at least two gas-liquid separation baffles are arranged between the first input buffer and the gaseous refrigerant output port at intervals in the length direction of the economizer.

[0019] The first refrigerant in gaseous state and the first refrigerant in liquid state flowing out of the outflow portion flow through the at least two gas-liquid separation baffles and flow toward the gaseous refrigerant outlet and the liquid refrigerant outlet.

[0020] According to another aspect of the embodiment of the present application, for the at least two gas-liquid separation baffles, the closer to the first input buffer part in the length direction of the economizer, the larger the gap is and / or the smaller the total area of ​​the gas passage holes is.

[0021] According to another aspect of the embodiment of the present application, when observed along the length direction of the economizer, the gas passage holes of adjacent gas-liquid separation baffles do not overlap.

[0022] According to another aspect of the embodiment of the present application, the economizer further comprises:

[0023] a filter screen disposed between the gaseous refrigerant outlet and the liquid refrigerant outlet, allowing the gaseous first refrigerant to pass through the filter screen and flow toward the gaseous refrigerant outlet; and / or

[0024] The liquid blocking box is arranged between the gaseous refrigerant outlet and the filter screen to block the first refrigerant in liquid form from entering the gaseous refrigerant outlet.

[0025] According to another aspect of the embodiment of the present application, the liquid retaining box has: a bottom surface facing the filter screen, two side walls connected to the bottom surface and parallel to the length direction of the economizer, an end surface facing the refrigerant inlet side, and an open end opposite to the end surface in the length direction;

[0026] At least one of the two side walls is formed with a through hole, and the through hole is located at a position of the side wall close to the open end.

[0027] According to another aspect of the embodiment of the present application, the refrigerant inlet is formed on one of the end plates, and the outflow portion is a first porous throttling baffle facing the top; or

[0028] The refrigerant inlet is formed at the top, the outflow portion is a second multi-porous throttling baffle facing the gas-liquid separation baffle, and a portion of the second multi-porous throttling baffle close to the top has a through hole.

[0029] According to another aspect of the embodiment of the present application, when observed along the length direction, the bottom of the cavity has a pair of protrusions extending toward the top, the pair of protrusions are parallel, or the distance between the pair of protrusions decreases as the position is farther away from the top.

[0030] According to another aspect of the embodiment of the present application, the economizer further comprises:

[0031] two opposing baffles, with a gap between the two baffles and the bottom; and

[0032] A buffer plate is located between the two baffles, the buffer plate is arranged facing the refrigerant inlet, and the buffer plate has a plurality of openings.

[0033] The number of the liquid refrigerant outlets is at least 2, which are respectively located on the 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, which are respectively located on the two outer sides of the area between the two baffles in the length direction.

[0034] The first refrigerant mixed in gaseous and liquid states input from the refrigerant input port passes through the openings of the buffer plate and flows from the gap between the baffle and the bottom to the at least two liquid refrigerant output ports and the at least two gaseous refrigerant output ports.

[0035] According to another aspect of the embodiment of the present application, the economizer further comprises:

[0036] The filter screen is disposed between the gaseous refrigerant outlet and the liquid refrigerant outlet, and allows the gaseous first refrigerant to pass through the filter screen and flow toward the gaseous refrigerant outlet.

[0037] According to another aspect of the embodiment of the present application, the economizer further comprises:

[0038] The liquid blocking box is arranged between the gaseous refrigerant outlet and the filter screen to block the first refrigerant in liquid form from entering the gaseous refrigerant outlet.

[0039] According to another aspect of the embodiment of the present application, the liquid retaining box has: a bottom surface facing the filter screen, two side walls connected to the bottom surface and parallel to the 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;

[0040] At least one of the two side walls is formed with a through hole, and the through hole is located at a position of the side wall close to the open end.

[0041] According to another aspect of the embodiment of the present application, the top of the economizer is a part of the cylinder of the evaporator, and the bottom and the end plate are fixed to the cylinder by being sealed with the cylinder.

[0042] According to another aspect of the embodiment of the present application, the top of the economizer is independent of the evaporator cylinder, and the bottom is fixedly connected to the refrigerant distributor via a connecting component.

[0043] According to another aspect of the embodiments of the present application, a heat exchange system is provided, which has an evaporator as described in any one of the above embodiments.

[0044] The beneficial effects of the present application are as follows: an economizer is arranged in the evaporator cylinder to separate the liquid refrigerant, so that the liquid refrigerant exchanges heat in the evaporator, thereby enabling the liquid refrigerant to be evenly distributed, thereby improving the heat exchange effect of the evaporator, and the evaporator has a compact structure, occupies little space, and is easy to process.

[0045] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0047] Figure 1 is a three-dimensional schematic diagram of the evaporator of Example 1 of the present application;

[0048] Figure 2 is a schematic diagram of the economizer of Example 1 of the present application;

[0049] Figure 3 is another three-dimensional schematic diagram of the evaporator of Example 1 of the present application;

[0050] Figure 4 is another three-dimensional schematic diagram of the evaporator of Example 1 of the present application;

[0051] Figure 5 yes Figure 4 A schematic diagram of an economizer in an evaporator;

[0052] Figure 6 is a three-dimensional schematic diagram of the evaporator of Example 2 of the present application;

[0053] Figure 7 is a three-dimensional diagram of the economizer of Example 2 of the present application;

[0054] Figure 8 is another three-dimensional schematic diagram of the evaporator of Example 2 of the present application;

[0055] Fig. 9 This is a schematic diagram of a heat exchange system in Example 3 of the present application. DETAILED DESCRIPTION

[0056] With reference to the accompanying drawings, the above and other features of the present application will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims.

[0057] In the following description of the present application, for the convenience of explanation, the direction extending from the central axis of the evaporator cylinder is called the "axial direction", the radial direction centered on the axis is called the "radial direction", and the circumferential direction centered on the axis is called the "circumferential direction". The direction from the economizer to the distributor is called the "downward direction", and the direction opposite to the "downward direction" is called the "upward direction", and the side of the components of the evaporator and the economizer facing the "upward direction" is called the "upper side", and the side opposite to the upper side is called the "lower side". It should be noted that the above definitions of the upper direction, the lower direction, the upper side and the lower side are only for the convenience of explanation, and do not limit the direction of the evaporator when in use.

[0058] Example 1

[0059] The embodiment of the present application provides an evaporator, Figure 1 Schematic diagram of the evaporator of this embodiment.

[0060] like Figure 1As shown, the evaporator 1 includes: a cylinder 10 , and a refrigerant distributor 11 and a heat exchange tube 12 arranged in the cylinder 10 .

[0061] In this embodiment, the refrigerant distributor 11 distributes the liquid first refrigerant entering the evaporator 1, thereby evenly distributing the first refrigerant to the outside of the heat exchange tube 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, and the first refrigerant outside the heat exchange tube 12 exchanges heat with the second refrigerant inside the heat exchange tube 12. The liquid first refrigerant may become gaseous after absorbing heat and be output from the air intake port 13 of the evaporator. There may be multiple heat exchange tubes 12, forming a heat exchange tube bundle.

[0062] like Figure 1 As shown, the evaporator 1 further includes an economizer 20 disposed in the cylinder 10. The length direction L of the economizer 20 is parallel to the axis X direction of the cylinder 10.

[0063] like Figure 1 As shown, the economizer 20 may include a cavity A enclosed by a top 21, a bottom 22, and two end plates 23, 24 located at two opposite ends of the economizer 20 along the length direction.

[0064] like Figure 1 As shown, the economizer 20 may further include: a refrigerant input port 25 , a gaseous refrigerant output port 26 , and a liquid refrigerant output port 27 .

[0065] Among them, the refrigerant input port 25 is used to input a first refrigerant mixed with gas and liquid into the cavity A of the economizer 20; the gaseous refrigerant output port 26 is used to output the gaseous first refrigerant from the cavity A of the economizer 20; the liquid refrigerant output port 27 can be connected to the refrigerant distributor 11, and is used to input the liquid first refrigerant into the refrigerant distributor 11.

[0066] In the present embodiment, the refrigerant input port 25, the gaseous refrigerant output port 26, and the liquid refrigerant output port 27 are distributed along the length direction L of the economizer 20. The gaseous and liquid mixed first refrigerant input from the refrigerant input port 25 into the cavity A of the economizer 20 is separated into a gaseous first refrigerant and a liquid first refrigerant in the process of flowing toward the gaseous refrigerant output port 26 and the liquid refrigerant output port 27. Thus, the liquid first refrigerant is output from the liquid refrigerant output port 27 to the distributor 11, and the gaseous first refrigerant is output from the gaseous refrigerant output port 26 to the outside of the cavity A.

[0067] According to the present embodiment, an economizer is arranged in the cylinder of the evaporator. The economizer separates the liquid refrigerant from the input gaseous and liquid mixed refrigerant in the process of flowing along the length direction of the economizer. The liquid refrigerant is input to the distributor, which is beneficial to the uniform distribution of the liquid refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator. Therefore, even if negative pressure refrigerant such as R1233zd(e) is used, the heat exchange effect of the refrigerant in the evaporator will not be affected due to the large volume flow rate of the gaseous refrigerant; in addition, the economizer has a large size in the length direction, so the gaseous and liquid mixed refrigerant can be fully separated in the process of flowing along the length direction of the economizer; in addition, the economizer is arranged in the cylinder of the evaporator, which has a compact structure, occupies a small space, and is easy to process.

[0068] Figure 2 FIG. 1 is a schematic diagram of the economizer of this embodiment. Figure 2 In FIG. 1 , only the economizer 20 is shown, and other components of the evaporator 1 are not shown.

[0069] like Figure 2 As shown, the economizer 20 may further include a first input buffer portion 28 and at least two gas-liquid separation baffles 29 .

[0070] like Figure 2 As shown, 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 28 may have an outflow portion 281 for the gaseous first refrigerant and the liquid first refrigerant to flow out of the accommodation space of the first input buffer 28. Thus, the first input buffer 28 may produce an effect of reducing the pressure of the gaseous and liquid mixed first refrigerant input to the economizer 20.

[0071] For example, the first input buffer section 28 may be an inverted trapezoidal box-shape, wherein the cross-sectional size of the upper top of the inverted trapezoidal box-shape is, for example, larger than the cross-sectional size of the lower bottom. The inverted trapezoidal box-shape may be welded to the bottom 22 and the end plate 23 of the economizer 20. In addition, the lower bottom and the side walls of the inverted trapezoidal box-shape may also be part of the bottom 22 and the end plate 23 of the economizer 20. The upper top of the inverted trapezoidal box-shape may 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 trapezoidal box-shape may form a first porous throttling baffle, thereby playing the role of the outflow section 281.

[0072] like Figure 2As shown, the at least two gas-liquid separation baffles 29 (e.g., 29a, 29b, 29c, 29d) may be disposed in the cavity A of the economizer. Each of the gas-liquid separation baffles 29 29a, 29b, 29c, 29d may have a gas through hole 291 for the gaseous first refrigerant to flow through, and a gap 292 may be provided between the gas-liquid separation baffle 29 and the bottom 22 of the economizer 20 for the liquid first refrigerant to flow through.

[0073] like Figure 2 As shown, the at least two gas-liquid separation baffles 29 are arranged between the first input buffer portion 28 and the gaseous refrigerant output port 26 in the length direction of the economizer 20. Thus, the gaseous first refrigerant and the liquid first refrigerant flowing out of the outflow portion 281 can flow through the at least two gas-liquid separation baffles 29 and flow to the gaseous refrigerant output port 26 and the liquid refrigerant output port 27.

[0074] In this embodiment, the gas-liquid separation baffle 29 may be fixed to the inner wall of the economizer 20. For example, the contact portion between the gas-liquid separation baffle 29 and the inner wall of the economizer 20 may be fixed by welding or other sealing connection methods.

[0075] In this embodiment, if Figure 2 As shown, 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 can be. Since the closer to the first input buffer 28, the larger the amount of the liquid first refrigerant, the larger the gap 292 is, the easier it is for the liquid first refrigerant to flow through. In addition, this embodiment may not be limited to this, and the gaps 292 of each gas-liquid separation baffle 29 may also be equal.

[0076] In this embodiment, if Figure 2 As shown, 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 smaller the total area of ​​the gas passage holes 291 can be. Since the closer to the first input buffer 28, the smaller the amount of the gaseous first refrigerant, the larger the total area of ​​the gas passage holes 291 can be to match the flow rate of the gaseous first refrigerant. In addition, this embodiment may not be limited to this, and the total area of ​​the gas passage holes 291 of each gas-liquid separation baffle 29 may also be equal.

[0077] In this embodiment, if Figure 2 As shown, when observing along the length L direction of the economizer 20, the gas passage holes 291 of adjacent gas-liquid separation baffles 29 do not overlap, wherein the adjacent gas-liquid separation baffles 29 are, for example, gas-liquid separation baffles 29a and 29b, and gas-liquid separation baffles 29b and 29c. Thus, the flow of the gaseous first refrigerant in the length L direction can be hindered, thereby improving the gas-liquid separation effect.

[0078] In this embodiment, the process of the first refrigerant mixed with gas and liquid flowing through each gas-liquid separation baffle 29 is as follows: the first refrigerant mixed with gas and liquid collides with the gas-liquid separation baffle 29, and the light gaseous refrigerant flows into the next-stage separation space from the gas through hole 291 on the upper part of the baffle, and the heavy liquid refrigerant falls to the bottom of the economizer under the action of gravity, and 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. After multiple separations, the first refrigerant mixed with gas and liquid is separated into gaseous refrigerant and mixed refrigerant with lower dryness.

[0079] In this embodiment, if Figure 2 As shown, the economizer 20 may further include at least one of a filter screen 31 and a liquid blocking box 32 .

[0080] Among them, the filter 31 can be arranged between the gaseous refrigerant outlet 26 and the liquid refrigerant outlet 27. The filter 31 can 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.

[0081] like Figure 2 As shown, the liquid blocking box 32 is arranged between the gaseous refrigerant output port 26 and the filter screen 31, and is used to block the liquid first refrigerant from entering the gaseous refrigerant output port 26. Wherein, the liquid blocking box 32 may have: a bottom surface 321 facing the filter screen 31, two side walls 322 connected to the bottom surface and parallel to the length L direction of the economizer 20, an end face 323 facing one side of the refrigerant input port 25, 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 blocking box 32 can be welded to the top 21 of the economizer 20, and the gaseous refrigerant output port 26 can be surrounded by the two side walls 322 and the end face 323 of the liquid blocking box 32. In addition, the bottom surface 321 and the end face 323 may not have an opening. Thus, the gaseous first refrigerant can enter the liquid blocking box 32 from the open end 324 of the liquid blocking box 32 and flow to the gaseous refrigerant output port 26.

[0082] like Figure 2 As shown, at least one of the two side walls 322 may be formed with a through hole 3221, which may be located near the open end 324 of the side wall 322. The number of the through holes 3221 may be more than one, and their function is to reduce the pressure of the gaseous first refrigerant in the liquid retaining box 32.

[0083] In this embodiment, if Figure 2 As shown, the refrigerant inlet 25 is formed on one end plate 23 of the economizer, and, as described above, the outflow portion 281 of the first buffer portion 28 faces the top 22 ( Figure 2 A first porous throttling baffle (not shown).

[0084] Figure 3 is another three-dimensional schematic diagram of the evaporator of this embodiment, such as Figure 3 As shown, the refrigerant inlet 25 of the economizer 20 can be formed at the top 21 of the economizer 20, and the outflow portion 281 of the first buffer portion 28 can be a second porous throttling baffle 281a facing the gas-liquid separation baffle 29, and the portion of the second porous throttling baffle 281a close to the top 21 has a through hole 281a1, so that the first refrigerant mixed with gas and liquid can flow out of the first buffer portion 28 from the through hole 281a1 and flow to the gas-liquid separation baffle 29.

[0085] In this embodiment, if Figure 2 As shown, when observed along the length L direction, the bottom 22 of the cavity A may have a pair of protrusions 33 and 34 extending toward the top 21, and the distance between the pair of protrusions 33 and 34 may decrease as the position is farther away from the top 21, thereby, the bottom 22 of the cavity A may be formed into an inverted trapezoid with a wide upper portion and a narrow lower portion. Thus, the inverted trapezoidal bottom 22 may form a larger upper gas fluid space and a smaller bottom liquid refrigerant space, which may effectively reduce the flow rate of the gaseous refrigerant and form a higher liquid level, forming a liquid seal at the bottom of the gas-liquid separation plate baffle 29, which not only blocks the upper-level gaseous refrigerant from flowing away from the gap 292, but also increases the flow rate of the liquid refrigerant, prompting it to flow out from the liquid refrigerant outlet 27 into the distributor.

[0086] In addition, the present embodiment may not be limited thereto, and when viewed along the length L direction, the pair of protrusions 33 and 34 of the bottom 22 of the cavity A may be parallel to form a rectangular shape.

[0087] In addition, in this embodiment, the liquid refrigerant outlet 27 may also be provided with an anti-swirl baffle (not shown), thereby reducing the speed at which the liquid first refrigerant flows out of the outlet 27 .

[0088] In this embodiment, if Figure 1 As shown, the top 21 of the economizer 20 may be a part of the cylinder 10 of the evaporator 1, and the bottom 22 and the end plates 23, 24 of the economizer 20 may be fixed to the cylinder 10 by sealing connection with the cylinder 10. The sealing connection may be, for example, welding.

[0089] In another embodiment, the top 21 of the economizer 20 can be independent of the evaporator cylinder 10, and the bottom 22 of the economizer 20 can be fixedly connected to the refrigerant distributor 11 through a connecting component, so that the economizer 20 is fixed to the refrigerant distributor 11. In addition, the refrigerant distributor 11 can be placed on a heat exchange tube support plate and supported by the support plate. As a result, the position of the economizer 20 in the evaporator cylinder is more flexible, and the position of the evaporator air intake port is not limited by the economizer structure. For example, the air intake port can be arranged directly above the center of the evaporator cylinder, or it can be arranged at other positions of the evaporator cylinder.

[0090] Figure 4 is another three-dimensional schematic diagram of the evaporator of this embodiment, Figure 5 yes Figure 4 A schematic diagram of an economizer in an evaporator. Figure 4 and Figure 5 As shown in FIG. 1 , the top 21 of the economizer 20 is independent of the evaporator cylinder 10, so that the economizer 20 can become an independent box. The bottom 22 of the economizer 20 can be fixedly connected to the refrigerant distributor 11 through the connecting component 35, so that the economizer 20 is fixed to the refrigerant distributor 11 ( Figure 5 As shown), wherein the connecting component 35 is, for example, an angle steel, and the bottom 22 of the economizer 20 and the refrigerant distributor 11 can be welded to the angle steel.

[0091] In addition, if Figure 5 As shown, when viewed along the length L direction, the pair of protrusions 33 and 34 of the bottom 22 of the cavity A are parallel to each other, thereby forming a rectangular shape.

[0092] According to the present embodiment, an economizer is arranged in the cylinder of the evaporator. The economizer separates the liquid refrigerant from the input gaseous and liquid mixed refrigerant in the process of flowing along the length direction of the economizer. The liquid refrigerant is input to the distributor, which is beneficial to the uniform distribution of the liquid refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator. Therefore, even if negative pressure refrigerant is used, the heat exchange effect of the refrigerant in the evaporator will not be affected by the large volume flow rate of the gaseous refrigerant; in addition, the economizer has a large size in the length direction, so the gaseous and liquid mixed refrigerant can be fully separated in the process of flowing along the length direction of the economizer; in addition, the economizer is arranged in the cylinder of the evaporator, which has a compact structure, occupies a small space, and is easy to process.

[0093] Example 2

[0094] Example 2 provides an evaporator as a variation of the evaporator of Example 1.

[0095] In Example 2, the structure of the economizer in the evaporator is different from that in Example 1.

[0096] Figure 6 Schematic diagram of the evaporator of this embodiment.

[0097] like Figure 6 As shown, the evaporator 1 includes: a cylinder 10 , and a refrigerant distributor 11 and a heat exchange tube 12 arranged in the cylinder 10 .

[0098] In this embodiment, the refrigerant distributor 11 distributes the liquid first refrigerant entering the evaporator 1, so as to evenly distribute the first refrigerant to the outside of the heat exchange tube 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, and the first refrigerant outside the heat exchange tube 12 exchanges heat with the second refrigerant inside the heat exchange tube 12, and the liquid first refrigerant may become gaseous after absorbing heat, and be output from the evaporator 1 through the air intake port 13 of the evaporator. There may be multiple heat exchange tubes 12, forming a heat exchange tube bundle.

[0099] like Figure 6 As shown, the evaporator 1 further includes an economizer 20 disposed in the cylinder 10. The length direction L of the economizer 20 is parallel to the axis X direction of the cylinder 10.

[0100] like Figure 6 As shown, the economizer 20 may include a cavity A enclosed by a top 21, a bottom 22, and two end plates 23, 24 located at two opposite ends of the economizer 20 along the length direction.

[0101] like Figure 6 As shown, the economizer 20 may further include: a refrigerant input port 25 , a gaseous refrigerant output port 26 , and a liquid refrigerant output port 27 .

[0102] In the present embodiment, the refrigerant input port 25, the gaseous refrigerant output port 26, and the liquid refrigerant output port 27 are distributed along the length direction L of the economizer 20. The gaseous and liquid mixed first refrigerant input from the refrigerant input port 25 into the cavity A of the economizer 20 is separated into a gaseous first refrigerant and a liquid first refrigerant in the process of flowing toward the gaseous refrigerant output port 26 and the liquid refrigerant output port 27. Thus, the liquid first refrigerant is output from the liquid refrigerant output port 27 to the distributor 11, and the gaseous first refrigerant is output from the gaseous refrigerant output port 26 to the outside of the cavity A.

[0103] Figure 7 FIG. 2 is a three-dimensional diagram of the economizer of Example 2. Figure 7 As shown, the economizer 20 further includes: two opposing baffles 71 , 72 and a buffer plate 73 .

[0104] There is a gap between the two opposing baffles 71 and 72 and the bottom 22 of the economizer 20, so as to allow the liquid first refrigerant to flow through.

[0105] The buffer plate 73 may be located between the two baffles 71 and 72 . The buffer plate 73 is disposed facing the refrigerant inlet 25 , and the buffer plate 73 may have a plurality of openings 731 , so that the first refrigerant mixed with liquid and gas can be decelerated through the buffer plate 73 .

[0106] like Figure 7 As shown, the number of liquid refrigerant outlets 27 is at least 2, and they are respectively located on the two outer sides of the area between the two baffles 71 and 72 in the length L direction. In addition, the number of gaseous refrigerant outlets 26 can be at least 2, and they are respectively located on the two outer sides of the area between the two baffles 71 and 72 in the length L direction.

[0107] In this embodiment, the first refrigerant mixed with gas and liquid input from the refrigerant input port 25 can pass through the opening 731 of the buffer plate 73 and flow from the gap between the baffles 71, 72 and the bottom 22 to the at least two liquid refrigerant output ports 27 and at least two gaseous refrigerant output ports 26.

[0108] In this embodiment, if Figure 7 As shown, the economizer 20 further includes a filter screen 74 . The filter screen 74 may be disposed between the gaseous refrigerant outlet 26 and the liquid refrigerant outlet 27 , allowing the gaseous first refrigerant to pass through the filter screen 74 and flow toward the gaseous refrigerant outlet 26 .

[0109] exist Figure 6 In the embodiment, the economizer 20 may have a back plate 75 , so that the economizer 20 is fan-shaped when viewed along the length direction L. The air intake port 13 of the evaporator may be located outside the back plate 75 .

[0110] Figure 8 is another three-dimensional schematic diagram of the evaporator of this embodiment, such as Figure 8 As shown, the economizer 20 does not have a back plate 75, so that the economizer 20 is semicircular when viewed along the length direction L. Figure 8 In the embodiment, the air intake port 13 of the evaporator may be located outside the economizer 20 in the length direction.

[0111] like Figure 8 As shown, the economizer 20 may further include a liquid blocking box 76. The liquid blocking box 76 may be disposed between the gaseous refrigerant outlet 26 and the filter screen 74 to block the liquid first refrigerant from entering the gaseous refrigerant outlet 26.

[0112] like Figure 8As shown, the liquid blocking box 76 has: a bottom surface 761 facing the filter 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 baffles 71, 72, and an open end 765 opposite to the end surface 764 in the length direction.

[0113] like Figure 8 As shown, at least one of the two side walls 762 , 763 is formed with a through hole 762 a , and the through hole 762 a is located at a position close to the open end 765 of the side wall.

[0114] In this embodiment, the two side walls 762, 763 and the end surface 764 of the liquid retaining box 76 can be connected to the top 21 ( Figure 8 The first refrigerant of the gaseous state can be welded to the liquid retaining box 76 (not shown), and the gaseous refrigerant outlet 26 can be surrounded by the two side walls 762, 763 and the end face 764 of the liquid retaining box 76. In addition, the bottom surface 761 and the end face 764 can have no opening. Thus, the gaseous first refrigerant can enter the liquid retaining box 76 from the open end 765 of the liquid retaining box 76 and flow to the gaseous refrigerant outlet 26. In addition, the effect of the through hole 762a is to reduce the pressure of the gaseous first refrigerant in the liquid retaining box 76.

[0115] In this embodiment, if Figure 6 As shown, the top 21 of the economizer 20 may be a part of the cylinder 10 of the evaporator 1, and the bottom 22 and the end plates 23, 24 of the economizer 20 may be fixed to the cylinder 10 by sealing connection with the cylinder 10. The sealing connection may be, for example, welding.

[0116] In another embodiment, the top 21 of the economizer 20 can be independent of the evaporator cylinder 10, and the bottom 22 of the economizer 20 can be fixedly connected to the refrigerant distributor 11 through a connecting component, so that the economizer 20 is fixed to the refrigerant distributor 11. For example, the connecting component can be an angle steel, and the bottom 22 of the economizer 20 and the refrigerant distributor 11 can be welded to the angle steel. In addition, the refrigerant distributor 11 can be placed on a heat exchange tube support plate and supported by the support plate. As a result, the position of the economizer 20 in the evaporator cylinder 10 is more flexible, and the position of the evaporator air intake port 13 is not limited by the structure of the economizer 20, and can be arranged directly above the center of the evaporator cylinder, or can be arranged at other positions of the evaporator cylinder.

[0117] According to the present embodiment, an economizer is arranged in the cylinder of the evaporator. The economizer separates the liquid refrigerant from the input gaseous and liquid mixed refrigerant in the process of flowing along the length direction of the economizer. The liquid refrigerant is input to the distributor, which is beneficial to the uniform distribution of the liquid refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator. Therefore, even if negative pressure refrigerant is used, the heat exchange effect of the refrigerant in the evaporator will not be affected by the large volume flow rate of the gaseous refrigerant; in addition, the economizer has a large size in the length direction, so the gaseous and liquid mixed refrigerant can be fully separated in the process of flowing along the length direction of the economizer; in addition, the economizer is arranged in the cylinder of the evaporator, which has a compact structure, occupies a small space, and is easy to process.

[0118] Example 3

[0119] Embodiment 3 of the present application provides a heat exchange system, which includes the evaporator described in Embodiment 1 or Embodiment 2.

[0120] Fig. 9 Schematic diagram of a heat exchange system in Example 3 of the present application. Fig. 9 As shown, the heat exchange system 90 may be a two-stage compression refrigeration system.

[0121] like Fig. 9 As shown, the economizer 20 is built into the cylinder of the evaporator 1, and the evaporator 1 is a falling film evaporator. The inlet 25 of the economizer 20 is connected to the bottom liquid outlet of the condenser 91, and an orifice plate is provided on the connecting pipeline between the economizer 20 and the bottom liquid outlet of the condenser 91 to throttle the refrigerant. After the gas and liquid of the economizer 20 are separated, the gaseous refrigerant output port 26 is directly connected to the secondary air intake port of the compressor 92, and the liquid refrigerant output port 27 is connected to the distributor 11 inside the evaporator for refrigerant distribution. The evaporator air intake port 13 is connected to the primary air intake port of the compressor 92. The heat exchange system 90 has a simple and clear structure and strong practicality.

[0122] Similarly, for refrigeration systems with more than two stages of compression, multi-stage throttling dampers and multiple gas refrigerant outlets can be designed in the economizer to achieve multi-stage air replenishment of the compressor.

[0123] In addition, for a non-multi-stage compression system, the gas refrigerant outlet 26 of the economizer 20 can be directly connected to the evaporator suction port 13, and throttling and reducing the pressure can be performed through a throttling orifice plate or a throttle valve to balance the pressure between the two pipelines.

[0124] Therefore, the evaporator 1 with the built-in economizer 20 of the present application can be applied to both a multi-stage (two-stage or more than two-stage) compression refrigeration system and a non-multi-stage compression refrigeration system.

[0125] In this embodiment, due to the use of the evaporator of the present application, the heat exchange efficiency of the heat exchange system is improved, and it is beneficial to the use of negative pressure refrigerant in the heat exchange system.

[0126] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

Claims

1. An evaporator (1), comprising: A cylinder (10), and a refrigerant distributor (11) and a heat exchange tube (12) arranged in the cylinder (10), wherein the refrigerant distributor (11) distributes the first refrigerant entering the evaporator (1), and the first refrigerant outside the heat exchange tube (12) performs heat exchange with the second refrigerant in the heat exchange tube (12); The evaporator (1) is characterized in that it further comprises an economizer (20) arranged in the cylinder (10), and 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 (21), a bottom (22), and two end plates (23, 24) located at two opposite ends of the economizer (20) along the length direction. The economizer (20) further comprises: A refrigerant input port (25) for inputting a mixture of gaseous and liquid first refrigerant into the cavity of the economizer (20); a gaseous refrigerant output port (26) for outputting the first refrigerant in a gaseous state from the cavity of the economizer (20); a liquid refrigerant output port (27), which is in communication with the refrigerant distributor (11) and is used to output the first refrigerant in liquid form to the refrigerant distributor (11); and a first input buffer (28) disposed in the cavity of the economizer (20); the refrigerant input port (25) disposed in the first input buffer (28); the first input buffer (28) having an outflow portion (281) for allowing the first refrigerant in a gaseous state and the first refrigerant in a liquid state to flow out of the accommodation space of the first input buffer (28); The refrigerant input port (25), the gaseous refrigerant output port (26), and the liquid refrigerant output port (27) are distributed along the length direction of the economizer (20). The first refrigerant mixed in gaseous and liquid states input from the refrigerant input port (25) into the cavity of the economizer (20) is separated into the first refrigerant in gaseous state and the first refrigerant in liquid state during the process of flowing toward the gaseous refrigerant output port (26) and the liquid refrigerant output port (27). The economizer (20) further comprises: At least two gas-liquid separation baffles (29) are arranged in the cavity of the economizer (20), the gas-liquid separation baffles (29) have a gas passage hole (291) for the first refrigerant in gas state to flow through, and a gap (292) is provided between the gas-liquid separation baffle (29) and the bottom (22) of the economizer for the first refrigerant in liquid state to flow through. The at least two gas-liquid separation baffles (29) are arranged at intervals between the first input buffer portion (28) and the gas refrigerant output port (26) in the length direction of the economizer (20). The gaseous first refrigerant and the liquid first refrigerant flowing out of the outflow portion (281) flow through the at least two gas-liquid separation baffles (29) and flow toward the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27).

2. The evaporator according to claim 1, characterized in that 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) is and / or the smaller the total area of ​​the gas passage holes (291) is.

3. The evaporator according to claim 1, characterized in that When viewed along the length direction of the economizer (20), the gas passage holes (291) of adjacent gas-liquid separation baffles (29) do not overlap.

4. The evaporator according to claim 1, characterized in that The economizer (20) further comprises: a filter (31) disposed between the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27), allowing the gaseous first refrigerant to pass through the filter (31) and flow toward the gaseous refrigerant outlet (26); and / or A liquid blocking box (32) is arranged between the gaseous refrigerant outlet (26) and the filter (31) to block the first refrigerant in liquid form from entering the gaseous refrigerant outlet (26).

5. The evaporator according to claim 4, characterized in that 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 the length direction of the economizer (20), an end surface (323) facing the refrigerant input port (25), and an open end (324) opposite to the end surface (323) in the length direction; At least one of the two side walls (322) is formed with a through hole (3221), and the through hole (3221) is located at a position of the side wall close to the open end (324).

6. The evaporator according to claim 1, characterized in that The refrigerant input port (25) is formed on one of the end plates (23, 24), and the outflow portion (281) is a first multi-hole throttling baffle facing the top (21); or The refrigerant inlet (25) is formed at the top (21), and the outflow portion (281) is a second porous throttling baffle (281a) facing the gas-liquid separation baffle (29), and the portion of the second porous throttling baffle (281a) close to the top (21) has a through hole (281a1).

7. The evaporator according to claim 1, characterized in that When observed along the length direction, the bottom (22) of the cavity has a pair of protrusions (33, 34) extending toward the top (21), and the pair of protrusions (33, 34) are parallel, or the distance between the pair of protrusions (33, 34) decreases as the position is farther away from the top (21).

8. An evaporator (1), comprising: A cylinder (10), and a refrigerant distributor (11) and a heat exchange tube (12) arranged in the cylinder (10), wherein the refrigerant distributor (11) distributes the first refrigerant entering the evaporator (1), and the first refrigerant outside the heat exchange tube (12) performs heat exchange with the second refrigerant in the heat exchange tube (12); The evaporator (1) is characterized in that it further comprises an economizer (20) arranged in the cylinder (10), and 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 (21), a bottom (22), and two end plates (23, 24) located at two opposite ends of the economizer (20) along the length direction. The economizer (20) further comprises: A refrigerant input port (25) for inputting a mixture of gaseous and liquid first refrigerant into the cavity of the economizer (20); a gaseous refrigerant output port (26) for outputting the first refrigerant in a gaseous state from the cavity of the economizer (20); a liquid refrigerant output port (27), which is in communication with the refrigerant distributor (11) and is used to output the first refrigerant in liquid form to the refrigerant distributor (11); and The refrigerant input port (25), the gaseous refrigerant output port (26), and the liquid refrigerant output port (27) are distributed along the length direction of the economizer (20). The first refrigerant mixed in gaseous and liquid states input from the refrigerant input port (25) into the cavity of the economizer (20) is separated into the first refrigerant in gaseous state and the first refrigerant in liquid state during the process of flowing toward the gaseous refrigerant output port (26) and the liquid refrigerant output port (27). The economizer (20) further comprises: Two opposing baffles (71, 72), with a gap between the two baffles (71, 72) and the bottom (22); and A buffer plate (73) is located between the two baffles (71, 72), the buffer plate (73) is arranged facing the refrigerant input port (25), and the buffer plate (73) has a plurality of openings (731). The number of the liquid refrigerant outlets (27) is at least two, and they are respectively located on the 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 two, and they are respectively located on the 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 and is input from the refrigerant input port (25), passes through the opening (731) of the buffer plate (73) and flows from the gap between the baffles (71, 72) and the bottom (22) to the at least two liquid refrigerant output ports (27) and the at least two gaseous refrigerant output ports (26).

9. The evaporator according to claim 8, characterized in that The economizer (20) further comprises: The filter (74) is arranged between the gaseous refrigerant outlet (26) and the liquid refrigerant outlet (27), allowing the first refrigerant in a gaseous state to pass through the filter (74) and flow toward the gaseous refrigerant outlet (26).

10. The evaporator according to claim 9, characterized in that The economizer also includes: A liquid blocking box (76) is arranged between the gaseous refrigerant outlet (26) and the filter (74) to block the first refrigerant in liquid form from entering the gaseous refrigerant outlet (26).

11. The evaporator according to claim 10, characterized in that The liquid retaining box (76) comprises: a bottom surface (761) facing the filter screen (74), two side walls (762, 763) connected to the bottom surface (761) and parallel to the length direction of the economizer (20), an end surface (764) facing one side of the baffles (71, 72), and an open end (765) opposite to the end surface (764) in the length direction; At least one of the two side walls (762, 763) is formed with a through hole (762a), and the through hole (762a) is located at a position of the side wall close to the open end (765).

12. The evaporator according to any one of claims 1 to 11, characterized in that: The top (21) of the economizer (20) is a part of the cylinder (10) of the evaporator (1), and the bottom (22) and the end plates (23, 24) are fixed to the cylinder (10) by being sealed with the cylinder (10).

13. The evaporator according to any one of claims 1 to 11, characterized in that: The top (21) of the economizer (20) is independent of the cylinder (10) of the evaporator (1), and the bottom (22) is fixedly connected to the refrigerant distributor (11) via a connecting component (8).

14. A heat exchange system (90), characterized in that: The heat exchange system (90) comprises the evaporator (1) according to any one of claims 1 to 13.

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