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 having: a cylinder, a refrigerant distributor, a heat exchange tube, and a separator, the separator comprising: a separator cylinder; a refrigerant input pipe, which is arranged in the separator cylinder, and a first refrigerant mixed with gas and liquid flows into the separator cylinder along the tangential direction of the inner wall of the separator cylinder through the refrigerant input pipe; a gaseous refrigerant output pipe, which is arranged at the axial upper end of the separator cylinder, and is used to output the gaseous first refrigerant; and a liquid refrigerant output port, which is arranged at the axial lower end of the separator cylinder, and the liquid refrigerant output port is connected with the refrigerant distributor, and is used to make the liquid first refrigerant flow to the refrigerant distributor. This embodiment is conducive to uniform distribution of the refrigerant in the evaporator, thereby improving the heat exchange effect of the evaporator.

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] In the heat exchange system, the evaporator is a commonly used device. The falling film evaporator is widely used due to its high heat exchange efficiency and small refrigerant charge.

[0003] Most of the existing chillers use R134a as the refrigerant, and the falling film evaporator is also designed based on the physical parameters of R134a. However, R134a has the disadvantages of high GWP (Global Warming Potential) and environmental pollution. Negative pressure refrigerants, such as R1233zd(E), are favored by people because of their environmental protection and high efficiency. Under typical working conditions (evaporation temperature 6℃, condensation temperature 37℃), the pressure difference between the condenser and evaporator of R134a is 575.3KPa. The pressure difference of R1233zd(E) is 134KPa, which is only 23.3% of R134a.

[0004] 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

[0005] The inventors of the present application discovered that when the evaporation temperature is 6°C, the gas phase density of the refrigerant R134a is 4.93 times that of R1233zd(E). 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.

[0006] The present application provides an evaporator and a heat exchange system including the evaporator. A separator is arranged in the evaporator, and the separator causes the input gaseous and liquid mixed refrigerant to rotate, thereby separating the liquid refrigerant. The liquid refrigerant is input into the evaporator for heat exchange, 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.

[0007] According to a first 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;

[0008] Wherein, the evaporator further comprises a separator, and the separator comprises:

[0009] A separator cylinder; a refrigerant inlet pipe, which is arranged in the separator cylinder, and the first refrigerant mixed in gaseous and liquid states flows into the separator cylinder along the tangential direction of the inner wall of the separator cylinder through the refrigerant inlet pipe; a gaseous refrigerant output pipe, which is arranged at the axial upper end of the separator cylinder and is used to output the gaseous first refrigerant; and a liquid refrigerant output port, which is arranged at the axial lower end of the separator cylinder, and the liquid refrigerant output port is connected to the refrigerant distributor, and is used to make the liquid first refrigerant flow to the refrigerant distributor.

[0010] According to a second aspect of the embodiment of the present application, the separator further includes:

[0011] A rectifying plate is disposed at the liquid refrigerant outlet and is used for rectifying the liquid first refrigerant flowing out of the liquid refrigerant outlet.

[0012] According to a third aspect of the embodiment of the present application, the separator further includes:

[0013] A throttle plate is disposed below the rectifying plate and is used for throttling the liquid first refrigerant flowing out of the liquid refrigerant outlet.

[0014] According to a fourth aspect of the embodiment of the present application, the separator further includes:

[0015] a first end plate, which is located at the upper end of the separator cylinder,

[0016] The gaseous refrigerant output pipe is arranged on the first end plate.

[0017] According to a fifth aspect of the embodiment of the present application, the separator further includes:

[0018] A liquid baffle, which is arranged below the first end plate and above the refrigerant inlet pipe, and is provided with an opening on the liquid baffle; a gas channel, which is arranged below the liquid baffle and is connected to the opening of the liquid baffle, wherein the gaseous first refrigerant separated from the gaseous and liquid mixed first refrigerant flowing into the separator cylinder from the refrigerant inlet pipe flows to the opening of the liquid baffle and the gaseous refrigerant outlet pipe through the gas channel; a flow equalizing plate, which is arranged below the gas channel and has a flow equalizing hole; and a rectifying grid, which is arranged below the flow equalizing plate and above the liquid refrigerant outlet and has crossed grid bars, wherein the liquid first refrigerant flows through the flow equalizing plate and the rectifying grid and enters the buffer zone between the rectifying grid and the liquid refrigerant outlet, and the liquid first refrigerant in the buffer zone flows into the refrigerant distributor from the liquid refrigerant outlet.

[0019] According to a sixth aspect of the embodiment of the present application, the separator further includes:

[0020] A valve device is arranged on the refrigerant input pipe and is used to control the amount of the first refrigerant flowing into the separator cylinder.

[0021] According to a seventh aspect of the embodiment of the present application, the separator further includes:

[0022] a liquid level measuring device, which is used to measure the liquid level of the first refrigerant in the separator cylinder,

[0023] The measurement result of the level measuring device is used to control the valve device.

[0024] According to an eighth aspect of the embodiment of the present application, the separator further includes:

[0025] The gas equalizing plate is located between the liquid baffle plate and the first end plate. The gas equalizing plate includes a gas equalizing area and a gas baffle area. The gas equalizing area is provided with gas equalizing holes, and the gas baffle area is not provided with gas equalizing holes.

[0026] According to a ninth aspect of the embodiment of the present application, the evaporator further comprises:

[0027] A gas inlet is arranged on the cylinder, and the gas inlet is connected to the gaseous refrigerant output pipe.

[0028] According to a tenth aspect of an embodiment of the present application, a heat exchange system is provided, which has an evaporator as described in any one of the first to ninth aspects of the above embodiments.

[0029] The beneficial effect of the present application is that a separator is provided in the evaporator to separate the liquid refrigerant, so that the liquid refrigerant is subjected to heat exchange in the evaporator, thereby enabling the liquid refrigerant to be evenly distributed, thereby improving the heat exchange effect of the evaporator.

[0030] 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

[0031] 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:

[0032] Figure 1 is a schematic axial cross-sectional view of the evaporator of Example 1 of the present application;

[0033] Figure 2 is a schematic cross-sectional view perpendicular to the axial direction of the evaporator of Example 1 of the present application;

[0034] Figure 3 is another schematic cross-sectional view perpendicular to the axial direction of the evaporator of Example 1 of the present application;

[0035] Figure 4 is a schematic diagram of the connection between the separator and the refrigerant distributor of Example 1 of the present application;

[0036] Figure 5 is a discrete structural schematic diagram of the separator of Example 1 of the present application;

[0037] Figure 6 is a schematic diagram of an implementation of the opening of the refrigerant input pipe of Example 1 of the present application;

[0038] Figure 7 It is a schematic diagram of another implementation of the opening of the refrigerant input pipe of Example 1 of the present application. DETAILED DESCRIPTION

[0039] 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.

[0040] In the following description of the present application, for the convenience of explanation, the direction extending from the central axis of the separator cylinder of the separator is referred to as the "axial direction", the radial direction centered on the axis is referred to as the "radial direction", and the circumferential direction centered on the axis is referred to as the "circumferential direction". In the axial direction, the direction of the gaseous refrigerant output is referred to as the "upper direction", and the direction opposite to the "upper direction" is referred to as the "lower direction", and the side of the evaporator and its components facing the "upper direction" is referred to as the "upper side" or "upper end", and the side opposite to the upper side is referred to as the "lower side" or "lower end". 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. Example

[0041] The embodiment of the present application provides an evaporator, Figure 1 is an axial cross-sectional schematic diagram of the evaporator of this embodiment, Figure 2 It is a cross-sectional schematic diagram of the evaporator of this embodiment perpendicular to the axial direction. Here, the axial direction of the evaporator refers to the direction in which the central axis of the cylinder of the evaporator extends, which is different from the axial direction of the separator cylinder.

[0042] like Figure 1 and Figure 2 As shown, the evaporator 100 may include: a cylinder 101, a refrigerant distributor 102, a heat exchange tube 103 ( Figure 1 Not shown, Figure 2 shown), and a separator 104.

[0043] In this embodiment, the barrel 101 may be, for example, a cylindrical barrel, and both ends of the axial direction thereof may be closed. The refrigerant distributor 102 and the heat exchange tube 103 may be disposed in the barrel 101, wherein the refrigerant distributor 102 may distribute the first refrigerant entering the barrel 101 of the evaporator; the first refrigerant distributed by the refrigerant distributor 102 may contact the heat exchange tube 103 and perform heat exchange with the second refrigerant flowing in the heat exchange tube 103.

[0044] In this embodiment, if Figure 1 and Figure 2 As shown, the separator 104 may include: a separator cylinder 41, a refrigerant input pipe 42 ( Figure 2 (not shown), a gaseous refrigerant output pipe 43, and a liquid refrigerant output port 44.

[0045] In this embodiment, the separator cylinder 41 may be, for example, a cylindrical cylinder. In addition, this embodiment is not limited thereto. For example, the separator cylinder 41 may also be a cylinder with a polygonal cross-section.

[0046] The refrigerant input pipe 42 can be arranged in the separator cylinder 41, and the first refrigerant mixed in gaseous and liquid states can flow into the interior of the separator cylinder 41 from the refrigerant input pipe 42 along the tangent direction of the inner wall of the separator cylinder 41. As a result, the first refrigerant in liquid state is thrown toward the inner wall of the separator cylinder 41 under the action of a large centrifugal force due to its large density, and the first refrigerant in liquid state is decelerated by contact with the inner wall, and falls along the inner wall into the bottom of the separator cylinder 41; the first refrigerant in gaseous state forms a rotating and descending external swirling airflow in the separator cylinder 41, and continuously flows into the radial center part of the separator cylinder 41 during the descending process, forming a centripetal radial airflow. Therefore, the first refrigerant mixed in gaseous and liquid states realizes the separation of gaseous and liquid states through the rotating motion in the separator cylinder 41 and the contact with the inner wall.

[0047] In this embodiment, the gaseous refrigerant output pipe 43 is disposed at the axial upper end of the separator cylinder 41 for outputting the separated gaseous first refrigerant.

[0048] In this embodiment, the liquid refrigerant outlet 44 is disposed at the axial lower end of the separator cylinder 41 , and the liquid refrigerant outlet 44 is connected to the refrigerant distributor 102 , so that the separated liquid first refrigerant can flow into the refrigerant distributor 102 .

[0049] According to this embodiment, a separator for separating gaseous refrigerant and liquid refrigerant is provided in the evaporator, and liquid refrigerant can be separated. The liquid refrigerant is input into the refrigerant distributor of the evaporator, which can make the refrigerant distribution more uniform and improve the heat exchange effect of the evaporator. In particular, 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 of the gaseous refrigerant, and therefore, it is conducive to the use of negative pressure refrigerant in the evaporator.

[0050] In this embodiment, the cylinder 101, the refrigerant distributor 102, and the heat exchange tube 103 of the evaporator 100 may constitute the structure of an evaporator in the prior art, and the structure of the evaporator in the prior art may be, for example, the structure of a falling film evaporator.

[0051] like Figure 1 , Figure 2 As shown, the refrigerant distributor 102 may extend along the axial direction of the cylinder 101, and the refrigerant distributor 102 may include a primary distributor 1021 and a secondary distributor 1022, wherein the primary distributor 1021 may be located above the secondary distributor 1022. The primary distributor 1021 may be connected to the liquid refrigerant output port 44 to receive the liquid first refrigerant from the separator 104.

[0052] In this embodiment, the primary distributor 1021 can be used to evenly distribute the liquid first refrigerant along the axial direction of the cylinder 101 under the action of liquid pressure, and the secondary distributor 1022 can be used to evenly distribute the liquid first refrigerant distributed by the primary distributor 1021 along the radial direction of the cylinder 101 under the action of gravity. In addition, this embodiment may not be limited to this, for example, the primary distributor 1021 may evenly distribute the refrigerant along the radial direction of the cylinder 101, and the secondary distributor 1022 may evenly distribute the refrigerant along the axial direction of the cylinder 101.

[0053] In this embodiment, the cylinder 101 may be provided with an opening (not shown), which may be used to accommodate the separator cylinder 41. In addition, the inner periphery of the opening and the separator cylinder 41 may be sealed to prevent the first refrigerant in the cylinder 101 from leaking.

[0054] In this embodiment, if Figure 2 As shown, the evaporator 100 may also have a gas inlet 1011, which may be arranged on the cylinder 101, and the gas inlet 1011 may be connected to the gaseous refrigerant output pipe 43. Thus, when the evaporator 100 is used in a single-stage compression refrigeration system, the gaseous refrigerant separated by the separator 104 may be input into the cylinder 101 via the gaseous refrigerant output pipe 43 and the gas inlet 1011.

[0055] For example, the gas inlet 1011 can be located in the middle and upper part of the cylinder 101 and below the distributor 102, so that the gaseous refrigerant separated by the separator 104 can enter the middle and upper part of the cylinder 101. When the second refrigerant of the evaporator flows in the heat exchange tube 103 in a bottom-in and top-out manner, the temperature difference between the first refrigerant and the second refrigerant at the bottom of the cylinder 101 is large, the heat exchange is very intense, and the heat transfer coefficient is large; in the middle and upper part of the evaporator cylinder 101, the second refrigerant has been cooled down, the temperature difference between the second refrigerant and the first refrigerant is very small, and the heat transfer coefficient is not very large. Therefore, the gaseous first refrigerant separated from the separator 104 is input into the cylinder 101 from the middle and upper part of the cylinder 101, which can increase the disturbance between the first refrigerant and the second refrigerant, intensify the heat exchange, and further improve the efficiency of the heat exchange between the first refrigerant and the second refrigerant.

[0056] Figure 3 1 is another cross-sectional schematic diagram of the evaporator of this embodiment perpendicular to the axial direction. In this embodiment, when the evaporator 100 is used in a two-stage compression or multi-stage compression refrigeration system, the evaporator 100 may not have a gas inlet 1011, and, as Figure 3 As shown, the gaseous refrigerant output pipe 43 can input the gaseous first refrigerant separated by the separator 104 into the air supply port of the compressor for mixing with the first refrigerant discharged after the first-stage compression and then performing the second-stage compression.

[0057] In this embodiment, the first refrigerant mixed with liquid and gaseous state input from the refrigerant input pipe 42 of the separator 104 may come from the condenser, wherein, in one embodiment, the first refrigerant output from the condenser is throttled to form the first refrigerant mixed with liquid and gaseous state. Figure 1 As shown, a valve device 421 can be provided on the refrigerant input pipe 42, and the valve device 421 can control the amount of the first refrigerant flowing into the separator cylinder 41, wherein the valve device 421 can be a throttle valve. For example, when the throttle valve is closed, the first refrigerant is stopped from being input into the separator cylinder 41. When the throttle valve is opened, the first refrigerant flowing through the throttle valve can be throttled, so that the first refrigerant mixed with liquid and gas is input into the separator cylinder 41. When the opening degree of the throttle valve is adjusted, the flow rate of the first refrigerant flowing through can be controlled.

[0058] Next, combine Figure 4 and Figure 5 The structure of the separator 104 will be described in detail.

[0059] Figure 4 is a schematic diagram of the connection between the separator and the refrigerant distributor of this embodiment, Figure 5 It is a schematic diagram of a discrete structure of the separator of this embodiment.

[0060] like Figure 4 and Figure 5 As shown, the separator 104 has a rectifying plate 45 in addition to the separator cylinder 41, the refrigerant input pipe 42, the gaseous refrigerant output pipe 43 and the liquid refrigerant output port 44. The description of the separator cylinder 41, the refrigerant input pipe 42, the gaseous refrigerant output pipe 43 and the liquid refrigerant output port 44 is the same as above.

[0061] In this embodiment, the rectifying plate 45 may be disposed at the liquid refrigerant outlet 44 to rectify the liquid first refrigerant flowing out of the liquid refrigerant outlet 44. The rectifying plate 45 may have crossed grid bars, which may be arranged crosswise at an angle of 90°, or may be arranged crosswise at other angles. A grid opening may be formed between the crossed grid bars, and the grid bars may have a certain height in the axial direction of the separator cylinder 41, so that when the liquid first refrigerant passes through the rectifying plate 45, its axial and radial disturbances will be limited by the grid opening, so that the liquid first refrigerant that is about to enter the refrigerant distributor 102 flows smoothly, achieving a rectifying effect.

[0062] In this embodiment, the area of ​​the rectifying plate 45 may be equal to or larger than the receiving opening 1020 (eg, Figure 4The area of ​​the receiving opening 1020 may be smaller than the cross-sectional area of ​​the separator cylinder 41 perpendicular to the axial direction. The lower end of the separator cylinder 41 may be sealed with the upper surface 102a of the refrigerant distributor 102, thereby preventing the first refrigerant in the separator cylinder 41 from leaking to the upper surface 102a of the refrigerant distributor 102.

[0063] In this embodiment, if Figure 4 and Figure 5 As shown, the separator 104 may further include a first end plate 46. The first end plate 46 may be located at the upper end of the separator cylinder 41, and the gaseous refrigerant output pipe 43 is disposed on the first end plate 46, for example, Figure 5 As shown, the first end plate 46 may be provided with a gas outlet opening 461 , and the gas refrigerant output pipe 43 is disposed in the gas outlet opening 461 .

[0064] In this embodiment, if Figure 4 and Figure 5 As shown, the separator 104 may further include: a liquid baffle 47 , a gas channel 48 , a flow equalizing plate 49 , and a rectifying grid 50 .

[0065] In this embodiment, the liquid baffle 47 is arranged below the first end plate 46 and above the refrigerant inlet pipe 42 , so that the liquid baffle 47 can prevent the liquid first refrigerant flowing into the cylinder from the refrigerant inlet pipe 42 from splashing to the area above the liquid baffle 47 .

[0066] In the present embodiment, the liquid baffle plate 47 may be provided with an opening 471. In one embodiment, the liquid baffle plate 47 may be formed in an annular shape, and the outer periphery of the annular shape may be sealed and connected to the inner periphery of the inner wall of the cylinder 41. For example, the outer periphery radius of the annular shape may be equal to the radius of the cylinder, and when the liquid baffle plate 47 is assembled to the inner wall of the cylinder 41, the two may be fully welded, thereby preventing the gas and liquid in the cylinder from leaking from the gap between the liquid baffle plate 47 and the inner wall of the cylinder 41. In the present embodiment, the annular liquid baffle plate 47 is only an example, and the present embodiment is not limited thereto. For example, the liquid baffle plate 47 may also be provided with a plurality of openings with smaller areas to replace the opening 471.

[0067] The gas channel 48 is disposed below the liquid baffle plate 47 and communicates with the opening 471 of the liquid baffle plate 47, wherein the gaseous first refrigerant separated from the gaseous and liquid mixed first refrigerant flowing into the separator cylinder 41 from the refrigerant input pipe 42 flows to the opening 471 of the liquid baffle plate 47 and the gaseous refrigerant output pipe 43 through the gas channel 48. Figure 5As shown, the gas channel 48 can be, for example, cylindrical, and the cylindrical gas channel 48 is open at both ends of the axial direction, and the upper end of the cylindrical gas channel 48 is connected to the liquid baffle plate 47, whereby the gaseous first refrigerant rotates between the radial outer side of the gas channel 48 and the separator cylinder 41, and when it reaches the lower end of the gas channel 48, it enters the gas channel 48 through the lower end of the gas channel 48 and flows to the opening 471 of the liquid baffle plate 47.

[0068] In this embodiment, the ratio of the radial dimension of the gas channel 48 to the radial dimension of the cylinder 41 may be 0.35-0.55, thereby allowing the gas to have sufficient flow space in the gas channel 48 .

[0069] In this embodiment, the structure of the gas channel 48 is not limited to the cylindrical shape, and the gas channel 48 may also have other structures capable of guiding the gaseous first refrigerant in the cylinder to the opening 471 of the liquid baffle 47 .

[0070] In this embodiment, the flow equalizing plate 49 may be disposed below the gas channel 48 . In one implementation, the flow equalizing plate 49 may be fixed to the inner wall of the cylinder 41 , for example, the two may be welded.

[0071] In this embodiment, a flow balancing hole 491 may be opened on the flow balancing plate 49 . The hole diameter of the flow balancing hole 491 may be 20 mm-50 mm. The flow balancing hole 491 allows the liquid first refrigerant reaching the flow balancing plate 49 to flow to the area below the flow balancing plate 49 .

[0072] In this embodiment, the flow equalizing plate 49 can block the liquid reaching the flow equalizing plate 49, thereby reducing the flow velocity of the liquid, changing the flow direction of the liquid, and reducing the rotational speed component of the liquid, thereby preventing the rotating flowing liquid from directly entering the area below the flow equalizing plate 49.

[0073] In this embodiment, the portion of the flow equalizing plate 49 opposite to the lower end of the gas channel 48 may not be provided with the flow equalizing hole 491, and the diameter of the portion without the flow equalizing hole 491 may be 40mm-80mm. This can prevent the liquid below the flow equalizing plate 49 from entering the lower end of the gas channel 48, and can also prevent the liquid first refrigerant attached to the outer wall of the gas channel 48 from directly falling into the area below the flow equalizing plate 49.

[0074] In this embodiment, the axial distance between the flow equalizing plate 49 and the lower end of the gas channel 48 can be 50mm-150mm, so that there is enough space between the flow equalizing plate 49 and the lower end of the gas channel 48 to allow the gaseous first refrigerant to enter the gas channel 48 from the lower end of the gas channel 48.

[0075] In this embodiment, the height difference between the flow equalizing plate 49 and the liquid baffle plate 47 can be, for example, 200mm-300mm. As a result, the flow velocity of the liquid first refrigerant is reduced in the area between the flow equalizing plate 49 and the liquid baffle plate 47. Therefore, this area becomes the main area for separating the gaseous first refrigerant and the liquid first refrigerant.

[0076] In this embodiment, the rectifying grid 50 is arranged below the flow equalizing plate 49 and above the liquid refrigerant outlet 44. The rectifying grid 50 may have crossed grid bars, which may be arranged at an angle of 90°, or may be arranged at other angles. A grid opening may be formed between the crossed grid bars, and the side length of the grid opening may be 25-45 mm. In addition, the height of the grid bars along the axial direction of the cylinder 41 may be 30-60 mm.

[0077] In this embodiment, the rectifying grid 50 may be fixed to the lower side of the current balancing plate 49 , but this embodiment is not limited thereto, and the rectifying grid 50 may also be fixed to the inner wall of the separator cylinder 41 .

[0078] In this embodiment, the rectifying grid 50 blocks the flow of liquid, which can further reduce the rotational flow velocity component of the liquid, effectively preventing the impact of the rotational flow velocity on the liquid below the rectifying grid 50 and preventing the liquid level from fluctuating.

[0079] In this embodiment, the liquid first refrigerant in the separator cylinder 41 enters the buffer zone between the rectifying grid 50 and the liquid refrigerant outlet 44 through the flow equalizing plate 49 and the rectifying grid 50, and the liquid first refrigerant in the buffer zone can flow from the liquid refrigerant outlet 44 into the refrigerant distributor 102. The gaseous first refrigerant in the separator cylinder 41 can reach the gaseous refrigerant outlet pipe 43 through the gas channel 48 and the opening 471 of the liquid baffle plate 47, and be discharged from the separator 104 from the gaseous refrigerant outlet pipe 43.

[0080] In this embodiment, the separator 104 may further include an air equalizing plate 51, which is located between the liquid baffle plate 47 and the first end plate 46. The air equalizing plate 51 may include an air equalizing zone and an air baffle zone, wherein the position of the air baffle zone may correspond to the opening 471 and / or the air outlet opening 461 of the liquid baffle plate 47, and the air baffle zone may not be provided with an air equalizing hole, the air equalizing zone may be located outside the air baffle zone, and the air equalizing zone may be provided with an air equalizing hole.

[0081] In this embodiment, the axial distance between the air equalizing plate 51 and the first end plate 46 may be, for example, 40 mm-80 mm, and the diameter of the air equalizing hole may be, for example, 20 mm-50 mm.

[0082] In this embodiment, the gaseous first refrigerant flowing out from the opening 471 of the liquid baffle plate 47 is blocked by the gas baffle area, and the flow direction is changed to flow to the gas outlet opening 461 through the gas equalizing port. This can prevent the gaseous first refrigerant from impacting the internal area of ​​the cylinder above the gas equalizing plate 51 at high speed.

[0083] In this embodiment, the separator 104 may further include a filter 52, which may be located between the air equalizing plate 51 and the first end plate 46, and the filter 52 may be provided with filter holes. For example, the filter 52 may be a filter net, which may cover the cross section of the separator cylinder 41 perpendicular to the axial direction, and the thickness of the filter net along the axial direction may be 25 mm-40 mm.

[0084] In this embodiment, the filter 52 can separate the liquid droplets of the gaseous first refrigerant flowing through the gas equalizing plate 51 , so that the separated gaseous first refrigerant is discharged from the gas outlet opening 461 .

[0085] In this embodiment, if Figure 5 As shown, the separator cylinder 41 may have an opening 411, and the opening 411 is used to set the refrigerant input pipe 42. The refrigerant input pipe 42 has an opening tangential to the inner wall of the cylinder 41, so that the gas-liquid mixed first refrigerant can flow into the cylinder 41 tangentially along the inner wall of the cylinder 41, thereby, the liquid first refrigerant rotates along the inner wall surface of the cylinder 41 and is subjected to centrifugal force, and at the same time, a speed component of downward movement is generated under the action of gravity, so that the liquid first refrigerant rotates downward along the inner wall surface of the cylinder 41 and is decelerated while flowing, while the gaseous first refrigerant is subjected to less centrifugal force and is easily separated from the liquid first refrigerant.

[0086] In this embodiment, the axial distance from the opening 411 of the separator cylinder 41 to the first end plate 46 accounts for 1 / 4-1 / 3 of the axial height of the separator cylinder 41. Therefore, the liquid first refrigerant has sufficient flow distance on the inner wall surface of the cylinder 41, so that the separation effect of the gaseous and liquid first refrigerant is better.

[0087] In this embodiment, if Figure 1 and Figure 4 As shown, the separator 104 may further include: a liquid level measuring device 53. The liquid level measuring device 53 is used to measure the liquid level of the liquid first refrigerant in the separator cylinder 41.

[0088] For example, Figure 4 As shown, the liquid level measuring device 53 may have two measuring ends 531 and 532 , wherein the measuring end 531 is located at a lower position and the measuring end 532 is located at a higher position.

[0089] In this embodiment, the measurement result of the liquid level measuring device 53 can be used to control the valve device 421. For example, when the liquid level of the first refrigerant in the liquid state reaches or is higher than the position of the measuring end 532, the opening degree of the valve device 421 can be reduced or even closed, thereby reducing the amount of the first refrigerant entering the separator cylinder 41; when the liquid level of the first refrigerant in the liquid state reaches or is lower than the position of the measuring end 532, the valve device 421 can be opened or the opening degree of the valve device 421 can be increased, thereby increasing the amount of the first refrigerant entering the separator cylinder 41, so that the liquid first refrigerant in the separator cylinder 41 can maintain a certain liquid level, thereby forming a liquid seal between the liquid refrigerant output port 44 and the refrigerant distributor 102, and the liquid first refrigerant is evenly distributed in the refrigerant distributor 102 under the action of a certain pressure difference.

[0090] In this embodiment, if Figure 4 As shown, the separator 104 may also include: a throttle plate 54 ( Figure 5 (not shown). The throttle plate 54 may be disposed below the rectifying plate 45 to throttle the liquid first refrigerant flowing out of the liquid refrigerant outlet 44 .

[0091] In this embodiment, when the throttle plate 54 is provided, the throttle plate 54 may cover the upper portion of the receiving opening 1020 of the refrigerant distributor 102 , and the rectifying plate 45 is disposed above the throttle plate 54 .

[0092] In this embodiment, when the evaporator is used in a two-stage compression and multi-stage compression refrigeration system, the separator 104 can function as an economizer of the refrigeration system. In the presence of a throttle plate 54, the refrigerant throttled by the throttle plate 54 is input into the refrigerant distributor 102.

[0093] Furthermore, in this embodiment, the opening of the refrigerant input pipe 42 may be set so that the first refrigerant mixed with liquid and gas enters the separator cylinder 41 tangentially along the cylinder wall of the separator cylinder 41 through the refrigerant input pipe 42 .

[0094] Figure 6 FIG. 4 is a schematic diagram of an embodiment of the opening of the refrigerant input pipe 42. Figure 6 As shown, the end face of the opening 422 of the refrigerant inlet pipe 42 can be perpendicular to the length direction of the portion 42a of the refrigerant inlet pipe 42 entering the separator cylinder 41, and the length direction of the portion 42a does not point to the central axis C of the separator cylinder 41.

[0095] Figure 7 FIG. 4 is a schematic diagram of another embodiment of the opening of the refrigerant input pipe 42. Figure 7As shown, the end surface of the opening 422 of the refrigerant input pipe 42 can be arranged along the inner wall of the separator cylinder 41 .

[0096] It should be noted that Figure 6 and Figure 7 This is just an example, and the present embodiment is not limited thereto. The opening 422 may also have other shapes as long as the first refrigerant mixed with liquid and gas can enter the separator cylinder 41 tangentially along the cylinder wall of the separator cylinder 41 through the refrigerant inlet pipe 42 .

[0097] The flow process of the first refrigerant in the evaporator in this embodiment is described below:

[0098] The liquid first refrigerant output by the condenser is throttled by the valve device 421 to form a first refrigerant mixed with liquid and gas. The first refrigerant mixed with liquid and gas enters the separator cylinder 41 tangentially along the cylinder wall of the separator cylinder 41 through the refrigerant inlet pipe 42. The liquid first refrigerant is subjected to a large centrifugal force and gravity, and rotates and flows downward along the inner wall surface of the cylinder 41, and is decelerated while flowing. The gaseous first refrigerant is subjected to a smaller centrifugal force. Therefore, in the area between the liquid baffle plate 47 and the flow equalizing plate 49, the gaseous first refrigerant and the liquid first refrigerant are separated.

[0099] On the one hand, the separated liquid first refrigerant flows downward to the flow equalizing plate 49, continues to flow downward through the flow equalizing holes 491 set in the flow equalizing plate 49 to reach the rectifying grid 50, and the rotation speed of the liquid first refrigerant is reduced again by the rectifying grid 50. Subsequently, the liquid first refrigerant flows through the rectifying grid 50, and when passing through the rectifying plate 45 below the rectifying grid 50, the rotation speed of the liquid first refrigerant is reduced again. The liquid first refrigerant passing through the rectifying plate 45 can directly enter the refrigerant distributor 102. In addition, when there is a throttle plate 54 below the rectifying plate 45, the liquid first refrigerant passing through the rectifying plate 45 can be throttled by the throttle plate 54 and then enter the refrigerant distributor 102.

[0100] On the other hand, the separated gaseous first refrigerant can flow upward along the gas channel 48 , be blocked by the gas equalizing plate 51 , change the flow direction, and then be filtered by the filter 52 to be discharged from the gas outlet 461 .

[0101] When the evaporator is used in a one-stage compression refrigeration system, the gaseous first refrigerant discharged from the gas outlet opening 461 can be guided into the cylinder 101 of the evaporator by the gaseous refrigerant output pipe 43, for example, input into the middle and upper part of the cylinder 101 of the evaporator. When the evaporator is used in a two-stage compression or multi-stage compression refrigeration system, the gaseous first refrigerant discharged from the gas outlet opening 461 can be guided to the air supply port of the compressor by the gaseous refrigerant output pipe 43.

[0102] In this embodiment, the first refrigerant may be a negative pressure refrigerant, such as R1233zd(E), etc. The greater the density difference between the gaseous and liquid states of the first refrigerant, the better the separation effect of the gaseous and liquid first refrigerant in the separator 104 .

[0103] According to this embodiment, a separator for separating gaseous refrigerant and liquid refrigerant is provided in the evaporator, so that liquid refrigerant can be separated. The liquid refrigerant is input into the refrigerant distributor of the evaporator, so that the refrigerant distribution can be more uniform, thereby improving the heat exchange effect of the evaporator. In particular, even if negative pressure refrigerants such as R1233zd (E) are used, the heat exchange effect of the refrigerant in the evaporator will not be affected due to the large volume flow of the gaseous refrigerant, so it is beneficial to use negative pressure refrigerants in the evaporator. In addition, in this embodiment, by providing a rectifier plate, the liquid first refrigerant flowing out of the liquid refrigerant outlet can be rectified, so that the liquid first refrigerant is evenly distributed in the refrigerant distributor; the liquid level measuring device measures the liquid level of the liquid refrigerant in the separator, controls the amount of refrigerant input into the separator, and can form a liquid seal with the liquid refrigerant in the separator. Example

[0104] Embodiment 2 of the present application provides a heat exchange system, which includes the evaporator described in Embodiment 1.

[0105] In one embodiment, the heat exchange system can be, for example, a single-stage compression refrigeration system, wherein the gaseous first refrigerant discharged from the gas outlet opening 461 of the separator 104 can be guided into the barrel 101 of the evaporator 100 by the gaseous refrigerant output pipe 43, for example, input into the middle and upper part of the barrel 101 of the evaporator.

[0106] In another embodiment, the heat exchange system may be, for example, a two-stage compression or multi-stage compression refrigeration system, wherein the gaseous first refrigerant discharged from the gas outlet opening 461 of the separator 104 may be guided to the air inlet of the compressor by the gaseous refrigerant output pipe 43 for mixing with the first refrigerant discharged after the first-stage compression and then performing the second-stage compression.

[0107] 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.

[0108] 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, comprising: A cylinder, and a refrigerant distributor and a heat exchange tube disposed in the cylinder, wherein the refrigerant distributor distributes the first refrigerant entering the evaporator, and the first refrigerant outside the heat exchange tube performs heat exchange with the second refrigerant inside the heat exchange tube; Characterized in that the evaporator further comprises a separator, and the separator comprises: Separator cylinder; A refrigerant input pipe is provided in the separator cylinder, and the first refrigerant mixed in gaseous and liquid states flows into the separator cylinder from the refrigerant input pipe along the tangential direction of the inner wall of the separator cylinder; a gaseous refrigerant output pipe, which is disposed at the axial upper end of the separator cylinder and is used to output the first refrigerant in a gaseous state; and a liquid refrigerant outlet, which is arranged at the axial lower end of the separator cylinder, the liquid refrigerant outlet being in communication with the refrigerant distributor, and is used to allow the first refrigerant in liquid state to flow to the refrigerant distributor; The evaporator also has: A gas inlet is arranged on the cylinder, the gas inlet is connected to the gaseous refrigerant output pipe, the gas inlet is located in the upper middle part of the cylinder and below the distributor.

2. The evaporator according to claim 1, characterized in that The separator also includes: A rectifying plate is disposed at the liquid refrigerant outlet and is used for rectifying the liquid first refrigerant flowing out of the liquid refrigerant outlet.

3. The evaporator according to claim 2, characterized in that The separator also includes: A throttle plate is disposed below the rectifying plate and is used for throttling the liquid first refrigerant flowing out of the liquid refrigerant outlet.

4. The evaporator according to claim 1, characterized in that The separator also includes: a first end plate, which is located at the upper end of the separator cylinder, The gaseous refrigerant output pipe is arranged on the first end plate.

5. The evaporator according to claim 4, characterized in that The separator also includes: A liquid baffle plate, which is arranged below the first end plate and above the refrigerant input pipe, and the liquid baffle plate is provided with an opening; A gas channel, which is arranged below the liquid baffle plate and communicated with the opening of the liquid baffle plate, wherein the gaseous first refrigerant separated from the gaseous and liquid mixed first refrigerant flowing into the separator cylinder from the refrigerant input pipe flows to the opening of the liquid baffle plate and the gaseous refrigerant output pipe through the gas channel; a flow balancing plate, which is disposed below the gas channel and has flow balancing holes; and A rectifying grid is arranged below the flow equalizing plate and above the liquid refrigerant outlet, and has crossed grid bars, wherein the liquid first refrigerant flows through the flow equalizing plate and the rectifying grid, and enters a buffer zone between the rectifying grid and the liquid refrigerant outlet, and the liquid first refrigerant in the buffer zone flows from the liquid refrigerant outlet into the refrigerant distributor through the rectifying plate.

6. The evaporator according to claim 1, characterized in that The separator also includes: A valve device is arranged on the refrigerant input pipe and is used to control the amount of the first refrigerant flowing into the separator cylinder.

7. The evaporator according to claim 6, characterized in that The separator also includes: a liquid level measuring device, which is used to measure the liquid level of the first refrigerant in the separator cylinder, The measurement result of the level measuring device is used to control the valve device.

8. The evaporator according to claim 5, characterized in that The separator also includes: The gas equalizing plate is located between the liquid baffle plate and the first end plate. The gas equalizing plate includes a gas equalizing area and a gas baffle area. The gas equalizing area is provided with gas equalizing holes, and the gas baffle area is not provided with gas equalizing holes.

9. A heat exchange system comprising the evaporator according to any one of claims 1 to 8.

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