A distribution plate for a distributor, a liquid storage type distributor, and a falling film type evaporator

Abstract

The present invention relates to the technical field of evaporators, and particularly relates to a distribution plate for a distributor, a liquid storage type distributor, and a falling film evaporator. It includes a plate body, on which a plurality of liquid distribution ports are arranged at equal intervals along a first direction. The width of the liquid distribution port in the first direction gradually increases from the middle to both ends along a second direction. When the liquid flows from the middle to both ends, the gradually increasing width can increase the liquid flow rate, thereby realizing uniform liquid distribution in the second direction. The opposite ends of the plate body in the first direction are bent in a direction perpendicular to the plate body to form a first bending portion. The two first bending portions are located on the same side of the plate body, so that the liquid can flow down along the first bending portion, preventing the liquid from accumulating at the middle position, thereby realizing uniform liquid distribution in the first direction, and further realizing uniform liquid distribution on the entire surface. Applying the distribution plate designed in this solution to the distributor can solve the problem of uneven distribution of the refrigerant during the falling film process.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporators, and particularly to a distribution plate for a distributor, a liquid storage type distributor, and a falling film evaporator. Background Art

[0002] With the increasing requirements for the energy efficiency of chillers, falling film evaporators have gradually been widely used in chillers. The falling film evaporator evenly distributes the liquid refrigerant on the surface of the heat exchange tubes through a distributor, forms a liquid film and evaporates by heating, and the unevaporated refrigerant deposits at the bottom of the evaporator for boiling heat exchange. Compared with the flooded evaporator, the falling film evaporator has better heat transfer performance. Under the same heat exchange requirements, it reduces the heat exchange tubes, reduces the heat exchange area, and saves the heat exchange cost. The bottom liquid level of the falling film evaporator is relatively low, and the required refrigerant charge is less. Relevant research shows that under the condition of the same cooling capacity, the refrigerant charge can be reduced by 25%. Therefore, the falling film evaporator is widely used in the fields of chemical industry, petroleum refining, building air conditioning, etc.

[0003] In practical applications, the falling film evaporator may have the situation of uneven refrigerant distribution. The liquid film thickness of different heat exchange tubes is too thin or too thick. The too thin position is prone to the "dry-out" phenomenon, reducing the heat exchange effect and seriously affecting the performance of the whole machine. How to ensure that the refrigerant is evenly distributed onto the heat exchange tubes and achieve continuous and stable flow is crucial for ensuring good heat transfer performance; the distributor, as the core component of the falling film evaporator, is the key factor affecting the heat exchange performance of the system; the existing distributors generally spray the heat exchange tubes in the falling film evaporator by direct spraying, and under different load conditions and different refrigerant charges, different pressures will be generated on the heat exchange tubes, and an optimal falling film effect cannot be guaranteed. Summary of the Invention

[0004] In order to overcome the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide a distribution plate for a distributor, a liquid storage type distributor, and a falling film evaporator, to solve the problems of uneven distribution and large impact pressure of the refrigerant during the falling film process, so as to improve the heat exchange effect.

[0005] In order to solve the above technical problem, the first technical solution adopted by the present invention is:

[0006] A distribution plate for a distributor, including a plate body. The plate body is provided with a first direction and a second direction perpendicular to the first direction. A plurality of liquid distribution ports are arranged at equal intervals along the first direction on the plate body. The width of the liquid distribution port in the first direction gradually increases from the middle to both ends along the second direction. The opposite ends of the plate body in the first direction are bent in a direction perpendicular to the plate body to form first bending portions, and the two first bending portions are located on the same side of the plate body;

[0007] The relative two ends of the liquid distribution port corresponding to the first direction are bent in a direction perpendicular to the plate body to form a second bending part, and both of the two second bending parts are located on the same side as the first bending part.

[0008] Furthermore, the shape of the plate body is rectangular, the first direction is the width direction of the plate body, and the second direction is the length direction of the plate body.

[0009] Furthermore, the shape of the liquid distribution port is strip-shaped.

[0010] Furthermore, the bending degree range of the first bending part is 30° - 60°.

[0011] The second technical solution adopted by the present invention is:

[0012] A liquid storage type distributor includes a cover body, a liquid storage tray, and the above-mentioned distribution plate for the distributor. The interior of the cover body is hollow, and one end face of the cover body has an opening. The distribution plate is located in the inner cavity of the cover body. The liquid storage tray is covered on the opening of the cover body and closes the opening of the cover body. A plurality of liquid storage members are provided on the side surface of the liquid storage tray close to the distribution plate. The liquid distribution port is arranged corresponding to the gap between two adjacent liquid storage members, and the width of the liquid distribution port in the first direction is less than or equal to the distance between the two adjacent liquid storage members corresponding to it. The liquid storage member is provided with an overflow hole in a penetrating manner. An inlet is penetrated through the other end face opposite to one end face of the cover body, and the inlet is located directly above the distribution plate.

[0013] Furthermore, the liquid storage member includes a plurality of liquid storage protrusions arranged at equal intervals along the second direction.

[0014] Furthermore, an anti-vortex structure is provided on the inner wall of the overflow hole, and the anti-vortex structure is a partition plate crossed in a cross shape.

[0015] Furthermore, air suction baffles are symmetrically provided at the relative two ends of the opening of the cover body corresponding to the first direction. The two air suction baffles are inclined in a direction away from each other, and a plurality of exhaust through grooves are provided on the air suction baffles.

[0016] The third technical solution adopted by the present invention is:

[0017] A falling film evaporator includes an evaporator cylinder body and the above-mentioned liquid storage type distributor. The liquid storage type distributor is located in the inner cavity of the evaporator cylinder body. A plurality of heat exchange components distributed in layers are further provided in the inner cavity of the evaporator cylinder body. The heat exchange component includes a plurality of heat exchange tubes arranged along the first direction.

[0018] Furthermore, the central position of the overflow hole is directly opposite to the axial center of the heat exchange tube in the first layer.

[0019] The beneficial effects of the present invention are as follows:

[0020] In this solution, a plurality of liquid distribution ports are arranged at equal intervals along the first direction on the plate body. The width of the liquid distribution port in the first direction gradually increases from the middle to both ends along the second direction. When the liquid flows from the middle to both ends, the gradually increasing width can increase the flow rate of the liquid, thereby realizing uniform liquid distribution in the second direction. The opposite ends of the plate body corresponding to the first direction are bent in a direction perpendicular to the plate body to form a first bending portion. The two first bending portions are located on the same side of the plate body, so that the liquid can flow down along the first bending portion, preventing the liquid from accumulating at the middle position, thereby realizing uniform liquid distribution in the first direction, and further realizing uniform liquid distribution on the entire surface. Moreover, the opposite ends of the liquid distribution port corresponding to the first direction are bent in a direction perpendicular to the plate body to form a second bending portion. Both of the two second bending portions are located on the same side as the first bending portion. The setting of the second bending portion can play a guiding role in the liquid, which can further improve the uniformity of liquid distribution. Applying the distribution plate designed in this solution to the distributor can solve the problem of uneven distribution of the refrigerant during the falling film process. Description of the Drawings

[0021] Figure 1 Shown is a schematic structural diagram of a distribution plate for a distributor according to the present invention;

[0022] Figure 2 Shown is a distribution plate for a distributor according to the present invention Figure 1 The enlarged structural diagram at A in;

[0023] Figure 3 Shown is a schematic structural diagram of a liquid distribution port for a distributor according to the present invention;

[0024] Figure 4 Shown is a schematic structural diagram of a liquid storage type distributor according to the present invention;

[0025] Figure 5 Shown is a liquid storage type distributor according to the present invention Figure 3 The front view structural diagram of;

[0026] Figure 6 Shown is a schematic structural diagram of a liquid storage tray of a liquid storage type distributor according to the present invention;

[0027] Figure 7 Shown is a schematic structural diagram of a falling film evaporator according to the present invention;

[0028] Figure 8 Shown is a falling film evaporator according to the present invention Figure 6 The front view structural diagram of;

[0029] Label Description:

[0030] 1. Cover body; 101. Liquid inlet; 102. First flow port; 103. Arc-shaped liquid baffle; 104. Second flow port; 2. Plate body; 201. Liquid distribution port; 202. Second bending part; 203. First bending part; 3. Liquid storage tray; 301. Liquid storage protrusion; 3011. Overflow hole; 302. Anti-vortex structure; 4. Suction baffle; 401. Exhaust through groove; 5. Evaporator cylinder; 6. Heat exchange tube; 7. Liquid inlet pipe; 8. Connecting flange. Specific embodiments

[0031] To describe in detail the technical content, achieved purpose and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the drawings.

[0032] Please refer to Figure 1 As shown, the first technical solution provided by the present invention:

[0033] A distribution plate for a distributor, comprising a plate body, the plate body is provided with a first direction and a second direction perpendicular to the first direction, a plurality of equally spaced liquid distribution ports are sequentially arranged on the plate body along the first direction, the width of the liquid distribution port in the first direction gradually increases from the middle to both ends along the second direction, and the opposite ends of the plate body in the first direction are bent in a direction perpendicular to the plate body to form a first bending part, and the two first bending parts are located on the same side of the plate body;

[0034] The opposite ends of the liquid distribution port in the first direction are bent in a direction perpendicular to the plate body to form a second bending part, and both of the two second bending parts are located on the same side as the first bending part.

[0035] From the above description, it can be seen that the beneficial effects of the present invention are as follows:

[0036] In this solution, a number of liquid distribution ports are arranged at equal intervals along the first direction on the plate body. The width of the liquid distribution port in the first direction gradually increases from the middle to both ends along the second direction. When the liquid flows from the middle to both ends, the gradually increasing width can increase the liquid flow rate, thereby realizing uniform liquid distribution in the second direction. The opposite ends of the plate body in the first direction are bent in a direction perpendicular to the plate body to form a first bending portion. The two first bending portions are located on the same side of the plate body, enabling the liquid to flow down along the first bending portion and preventing the liquid from accumulating in the middle position, thereby realizing uniform liquid distribution in the first direction and further realizing uniform liquid distribution over the entire surface. Moreover, the opposite ends of the liquid distribution port in the first direction are bent in a direction perpendicular to the plate body to form a second bending portion. The two second bending portions are both located on the same side as the first bending portion. The setting of the second bending portion can guide the liquid, further improving the uniformity of liquid distribution. Applying the distribution plate designed in this solution to a distributor can solve the problem of uneven distribution of refrigerant during the falling film process.

[0037] Further, the shape of the plate body is rectangular, the first direction is the width direction of the plate body, and the second direction is the length direction of the plate body.

[0038] Further, the shape of the liquid distribution port is strip-shaped.

[0039] Further, the bending degree range of the first bending portion is 30° - 60°.

[0040] As can be seen from the above description, setting the bending degree range of the first bending portion to 30° - 60° can further improve the uniformity of liquid distribution.

[0041] Please refer to Figure 4 As shown in the figure, the second technical solution adopted by the present invention is as follows:

[0042] A liquid storage type distributor includes a cover body, a liquid storage tray, and the above-mentioned distribution plate for the distributor. The interior of the cover body is hollow, and one end face of the cover body has an opening. The distribution plate is located in the inner cavity of the cover body. The liquid storage tray is covered on the opening of the cover body and closes the opening of the cover body. A number of liquid storage members are provided on the side of the liquid storage tray close to the distribution plate. The liquid distribution port is arranged corresponding to the gap between two adjacent liquid storage members, and the width of the liquid distribution port in the first direction is less than or equal to the distance between the two adjacent liquid storage members corresponding to it. The liquid storage member is provided with an overflow hole penetrating through it. An inlet port is penetrated through the other end face opposite to one end face of the cover body, and the inlet port is located directly above the distribution plate.

[0043] As can be seen from the above description, the beneficial effects of the present invention are as follows:

[0044] By providing a cover body, a distribution plate and a liquid storage tray, a number of liquid storage components are provided on one side of the liquid storage tray close to the distribution plate. The liquid distribution openings are arranged corresponding to the gaps between adjacent two liquid storage members, and the width of the liquid distribution openings in the first direction is less than or equal to the distance between the corresponding adjacent two liquid storage members. The liquid storage members are penetrated with overflow holes. On the other end surface opposite to one end surface of the cover body, a liquid inlet is penetrated. The liquid inlet is located directly above the distribution plate. In this way, when the liquid refrigerant enters the cover body through the liquid inlet, the liquid refrigerant falls from the liquid distribution openings on the distribution plate into the gaps between adjacent two liquid storage members. The liquid refrigerant forms a certain liquid level height on the liquid storage tray. When the liquid level height exceeds the height of the liquid storage members, the liquid refrigerant overflows from the overflow holes, and thus can be evenly sprayed on the surface of the heat exchange tubes below the liquid storage tray. Compared with the existing technology of direct spraying without liquid storage, after the liquid storage type distributor accumulates the same amount of liquid refrigerant in the flow channels between the liquid storage members, the refrigerant is then sprayed downward to form a uniform liquid film on the surface of the heat exchange tube bundle, avoiding the "dry-out" phenomenon between the heat exchange tubes and improving the heat exchange effect. The liquid storage type distributor designed in this solution can realize the uniform film-like distribution of the refrigerant liquid on the heat exchange tubes, thereby improving the heat exchange efficiency between the refrigerant and the heat exchange tubes; on the other hand, since it is not direct spraying, the pressure of the refrigerant liquid impacting on the surface of the heat exchange tubes can be reduced, and the risk of damage to the heat exchange tubes caused by long-term spraying of the refrigerant can be reduced, extending the service life of the heat exchange tubes.

[0045] Further, the liquid storage members include a number of liquid storage protrusions arranged at equal intervals in the second direction.

[0046] Further, an anti-vortex structure is provided on the inner wall of the overflow hole, and the anti-vortex structure is a partition plate cross-shaped in a cross.

[0047] As can be seen from the above description, by providing the above structure, vortex generation can be prevented, and under the action of the anti-vortex structure disturbing the flow, the distribution area of the refrigerant on the surface of the heat exchange tubes is increased.

[0048] Further, at opposite ends of the opening of the cover body corresponding to the first direction, suction baffles are symmetrically provided. The two suction baffles are inclined in directions away from each other, and a number of exhaust through slots are provided on the suction baffles.

[0049] As can be seen from the above description, by providing the suction baffles, the refrigerant liquid in the evaporator can be prevented from entering the suction port, avoiding liquid entrainment during suction; and a number of exhaust through slots are provided on the suction baffles, so that the evaporated refrigerant gas enters the suction port through the exhaust through slots.

[0050] Please refer to Figure 7 As shown, the third technical solution adopted by the present invention is:

[0051] A falling film evaporator, comprising an evaporator cylinder body and the above-mentioned liquid storage distributor, wherein the liquid storage distributor is located in the inner cavity of the evaporator cylinder body, and a plurality of heat exchange components arranged in layers are further provided in the inner cavity of the evaporator cylinder body. The heat exchange components include a plurality of heat exchange tubes arranged along a first direction.

[0052] As can be seen from the above description, the beneficial effects of the present invention are as follows:

[0053] Through the reasonable structural design of the distributor, on the one hand, the refrigerant is reasonably distributed, so that the refrigerant liquid forms a uniform film-like distribution on the heat exchange tubes in the evaporator, improving the heat exchange efficiency between the refrigerant and the heat exchange tubes; on the other hand, the pressure of the refrigerant liquid impact on the surface of the heat exchange tubes is reduced, and the risk of damage to the heat exchange tubes caused by the long-term spraying of the refrigerant is reduced, and the service life of the heat exchange tubes is prolonged.

[0054] Furthermore, the central position of the overflow hole is directly opposite to the axial center of the heat exchange tubes in the first layer.

[0055] As can be seen from the above description, by making the central position of the overflow hole directly opposite to the central position of the heat exchange tubes in the first layer, the refrigerant can be more evenly distributed on the surface of the heat exchange tubes.

[0056] Please refer to Figures 1 to 3 and Figure 5 As shown, Embodiment 1 of the present invention is:

[0057] Please refer to Figures 1 to 3 and Figure 5 , a distribution plate for a distributor, comprising a plate body 2. The plate body 2 is provided with a first direction and a second direction perpendicular to the first direction. A plurality of liquid distribution ports 201 arranged at equal intervals are successively formed on the plate body 2 along the first direction. The width of the liquid distribution port 201 in the first direction gradually increases from the middle to both ends along the second direction. The opposite ends of the plate body 2 in the first direction are bent in a direction perpendicular to the plate body 2 to form a first bending portion 203, and the two first bending portions 203 are located on the same side of the plate body 2;

[0058] Please refer to Figure 5 , the opposite ends of the liquid distribution port 201 in the first direction are bent in a direction perpendicular to the plate body 2 to form a second bending portion 202, and the two second bending portions 202 are both located on the same side as the first bending portion 203.

[0059] In this embodiment, the shape of the plate body 2 is rectangular, the first direction is the width direction of the rectangular plate body 2, and the second direction is the length direction of the rectangular plate body 2.

[0060] The shape of the liquid distribution port 201 is strip-shaped.

[0061] The bending degree range of the first bending part 203 is 30° - 60°, preferably 45°.

[0062] Please refer to Figures 1 to 6 As shown in the figure, the second embodiment of the present invention is as follows:

[0063] Please refer to Figures 1 to 5 , a liquid storage type distributor, including a cover body 1, a liquid storage tray 3 and the above-mentioned distribution plate. The inside of the cover body 1 is hollow, and one end face of the cover body 1 has an opening. The distribution plate is located in the inner cavity of the cover body 1. The liquid storage tray 3 is covered on the opening of the cover body 1 and closes the opening of the cover body 1. A plurality of liquid storage members are provided on the side surface of the liquid storage tray 3 close to the distribution plate. The liquid distribution port 201 is arranged corresponding to the gap between two adjacent liquid storage members, and the width of the liquid distribution port 201 in the first direction is less than or equal to the distance between its corresponding two adjacent liquid storage members. The liquid storage member is provided with an overflow hole 3011 in a penetrating manner. An inlet port 101 is penetrated through the other end face of the cover body 1 opposite to one end face. The inlet port 101 is located directly above the distribution plate.

[0064] The liquid storage member includes a plurality of liquid storage protrusions 301 arranged at equal intervals in the second direction. The shape of the liquid storage includes but is not limited to a circle, a triangle, a quadrilateral, a polygon, etc. The height range of the liquid storage protrusion 301 is 3mm - 10mm, preferably 7.5mm.

[0065] Please refer to Figure 4 , a plurality of first flow ports 102 are symmetrically penetrated through the opposite side surfaces of the cover body 1 in the second direction. A plurality of second flow ports 104 are symmetrically penetrated through the opposite ends of the end face of the cover body 1 provided with the inlet port 101 in the second direction. The second flow ports 104 are arranged in one-to-one correspondence with the first flow ports 102. By providing the first flow ports 102 and the second flow ports 104, part of the refrigerant entering the cover body 1 evaporates into gas and can be discharged from the flow ports on both sides and directly enter the suction port.

[0066] Please refer to Figure 4 and Figure 5 , the second flow port 104 is bent in a direction perpendicular to the cover body 1 to form an arc-shaped liquid baffle 103. By bending the second flow port 104 in a direction perpendicular to the cover body to form an arc-shaped liquid baffle, the refrigerant liquid flowing out from the gas flow channel falls onto the surface of the heat exchange tube bundle at the bottom from both sides of the cover body 1 under the action of the arc-shaped liquid baffle and gravity for heat exchange and evaporation. The setting of the arc-shaped liquid baffle 103 can also prevent the refrigerant flowing out from the gas flow channel from carrying liquid and causing liquid suction.

[0067] The opposite ends of the plate body 2 in the first direction are bent in a direction perpendicular to the plate body 2 to form first bending portions 203. The two first bending portions 203 are located on the same side of the plate body 2, so that the refrigerant can flow better along the first bending portions 203 to both sides of the liquid storage tray 3, and more gas overflow space is reserved on both sides of the cover body 1 to prevent liquid entrainment during suction.

[0068] Please refer to Figure 6 , in order to prevent the refrigerant flowing down from the overflow hole 3011 from generating vortices, an anti-vortex structure 302 is provided on the inner wall of the hole of the overflow hole 3011. The anti-vortex structure 302 is a partition plate that crosses in a cross shape, and can increase the distribution area of the refrigerant on the surface of the heat exchange tube under the action of disturbing the flow of the anti-vortex structure 302.

[0069] Please refer to Figure 5 , at the opposite ends of the opening of the cover body 1 in the first direction, suction baffles 4 are symmetrically provided. The suction baffles 4 are inclined outward, so as to prevent the refrigerant liquid in the evaporator from entering the suction port and avoid liquid entrainment during suction; a plurality of exhaust through grooves 401 are formed on the suction baffles 4, so that the evaporated refrigerant gas enters the suction port through the exhaust through grooves 401.

[0070] When the liquid refrigerant enters the cover body 1 through the liquid inlet 101, the liquid refrigerant forms a certain liquid level height on the liquid storage tray 3. When the liquid level height exceeds the height of the liquid storage protrusion 301, the liquid refrigerant overflows from the overflow hole 3011, so that it can be evenly sprayed on the heat exchange surface below the liquid storage tray 3. Compared with the existing technology of direct spraying without liquid storage, after the liquid refrigerant accumulates in the flow channels between the liquid storage protrusions 301 of the liquid storage type distributor, the refrigerant is then sprayed downward to form a uniform liquid film on the surface of the heat exchange tube, avoiding the "dry-out" phenomenon between the heat exchange tubes and improving the heat exchange effect.

[0071] After the gas-liquid two-phase refrigerant enters the cover body 1, the liquid-phase refrigerant falls onto the liquid storage tray 3 through the liquid distribution openings 201 on the distribution plate. By setting the positional correspondence relationship between the liquid distribution openings 201 and the liquid storage protrusions 301, and under the action of the second bending portion 202, the liquid refrigerant can more accurately drop onto the gap between two adjacent liquid storage protrusions 301.

[0072] The gas refrigerant falling from the liquid inlet 101 overflows from the first flow port 102 and the second flow port 104. In order to prevent the refrigerant discharged from the first flow port 102 and the second flow port 104 from entraining liquid, the second flow port 104 is bent in a direction perpendicular to the cover body 1 to form an arc-shaped liquid baffle 103. The entrained liquid refrigerant falls onto the surface of the heat exchange tube and evaporates under the action of the arc-shaped liquid baffle 103 and gravity.

[0073] The liquid refrigerant falling from the liquid distribution port 201 flows in the gap between two adjacent liquid storage protrusions 301 to complete the uniform liquid distribution process. When the liquid level height on the liquid storage tray 3 exceeds the height of the liquid storage protrusion 301, the liquid refrigerant descends in a film along the overflow hole 3011 to the surface of the heat exchange tube and exchanges heat with the heat exchange tube for evaporation; under the action of the anti-vortex structure 302, the refrigerant flowing down from the overflow hole 3011 is prevented from generating vortices and reducing the heat exchange effect.

[0074] Please refer to Figures 1 to 8 As shown in the figure, Embodiment 3 of the present invention is as follows:

[0075] Please refer to Figures 1 to 8 , a falling film evaporator, comprising an evaporator cylinder 5 and the above-mentioned liquid storage distributor, the liquid storage distributor is located in the inner cavity of the evaporator cylinder 5, and a plurality of heat exchange components arranged in layers are further provided in the inner cavity of the evaporator cylinder 5, and the heat exchange components include a plurality of heat exchange tubes 6 arranged along the first direction.

[0076] Please refer to Figure 7 and Figure 8 , the central position of the overflow hole 3011 is directly opposite to the axial center of the heat exchange tube 6 located in the first layer, so that a uniform liquid film thickness can be formed around the heat exchange tube 6 for the liquid refrigerant.

[0077] The axial hole pitch range of the overflow hole 3011 along the heat exchange tube 6 is 20 mm - 60 mm, preferably 30 mm. To avoid excessive pressure drop caused by too high a refrigerant flow rate at the position directly opposite to the liquid inlet 101, the aperture of the overflow hole 3011 at the position on the liquid storage tray 3 directly opposite to the liquid inlet 101 is larger than the apertures of the overflow holes 3011 on both sides.

[0078] Please refer to Figure 7 and Figure 8 , an inlet pipe 7 is connected to the evaporator cylinder 5, the inlet pipe 7 is communicated with the liquid inlet 101 of the cover body 1, and a connecting flange 8 is provided at the inlet of the inlet pipe 7 for connecting the inlet pipe 7 outside the evaporator.

[0079] When the liquid refrigerant enters the cover body 1 through the liquid inlet 101, the liquid refrigerant forms a certain liquid level height on the liquid storage tray 3. When the liquid level height exceeds the height of the liquid storage protrusion 301, the liquid refrigerant overflows from the overflow hole 3011, so that it can be evenly sprayed on the heat exchange surface below the liquid storage tray 3. Compared with the existing technology of direct spraying without liquid storage, after the liquid storage distributor accumulates the same amount of liquid refrigerant in the flow channels between the liquid storage protrusions 301, the refrigerant is then sprayed downward to form a uniform liquid film on the surface of the heat exchange tube 6, avoiding the "dry" phenomenon between the heat exchange tubes 6 and improving the heat exchange effect.

[0080] After the refrigerant in the gas-liquid two-phase state enters the cover body 1, the liquid-phase refrigerant drops onto the liquid storage tray 3 through the liquid distribution openings 201 on the distribution plate. By setting the corresponding relationship between the positions of the liquid distribution openings 201 and the liquid storage protrusions 301, and under the action of the second bending portion 202, the liquid refrigerant can more accurately drop onto the gap between two adjacent liquid storage protrusions 301.

[0081] The gaseous refrigerant dropping from the liquid inlet 101 overflows from the first flow port 102 and the second flow port 104. In order to prevent the refrigerant discharged from the first flow port 102 and the second flow port 104 from carrying liquid, the second flow port 104 is bent in a direction perpendicular to the cover body 1 to form an arc-shaped liquid baffle 103. The entrained liquid refrigerant drops onto the surface of the heat exchange tube 6 and evaporates under the action of the arc-shaped liquid baffle 103 and gravity.

[0082] The liquid refrigerant dropping from the liquid distribution openings 201 flows in the gap between two adjacent liquid storage protrusions 301 to complete the process of uniform liquid distribution. When the liquid level height on the liquid storage tray 3 exceeds the height of the liquid storage protrusions 301, the liquid refrigerant descends in a film along the overflow holes 3011 to the surface of the heat exchange tube 6 and exchanges heat with the heat exchange tube 6 for evaporation; under the action of the anti-vortex structure 302, the refrigerant flowing down from the overflow holes 3011 is prevented from generating vortices and reducing the heat exchange effect.

[0083] In summary, a liquid distribution plate, a liquid storage type distributor and a falling film type evaporator for a distributor provided by the present invention, by setting a cover body, a distribution plate and a liquid storage tray, a plurality of liquid storage components are provided on one side surface of the liquid storage tray close to the distribution plate, the liquid distribution openings are arranged corresponding to the gaps between two adjacent liquid storage members, and the width of the liquid distribution openings in the first direction is less than or equal to the distance between two adjacent liquid storage members corresponding thereto. The liquid storage members are provided with overflow holes penetrating therethrough, and an inlet is penetrated through the other end surface opposite to one end surface of the cover body, and the inlet is located directly above the distribution plate. In this way, when the liquid refrigerant enters the cover body through the inlet, the liquid refrigerant drops from the liquid distribution openings on the distribution plate into the gap between two adjacent liquid storage members, and the liquid refrigerant forms a certain liquid level height on the liquid storage tray. When the liquid level height exceeds the height of the liquid storage members, the liquid refrigerant overflows from the overflow holes, so that it can be evenly sprayed on the surface of the heat exchange tube below the liquid storage tray. Compared with the prior art of directly spraying without liquid storage, after the liquid storage type distributor accumulates the same amount of liquid refrigerant in the flow channels between the liquid storage members, the refrigerant is then sprayed downward to form a uniform liquid film on the surface of the heat exchange tube bundle, avoiding the "dry-out" phenomenon between the heat exchange tubes and improving the heat exchange effect. The designed liquid storage type distributor of the present solution can realize the uniform film-like distribution of the refrigerant liquid on the heat exchange tube, thereby improving the heat exchange efficiency between the refrigerant and the heat exchange tube; on the other hand, since it is not directly sprayed, the pressure of the refrigerant liquid impacting on the surface of the heat exchange tube can be reduced, and the risk of damage to the heat exchange tube caused by long-term spraying of the refrigerant can be reduced, and the service life of the heat exchange tube can be extended.

[0084] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A liquid storage type distributor, characterized in that, It includes a cover body, a liquid storage tray and a distribution plate. The distribution plate includes a plate body. The plate body is provided with a first direction and a second direction perpendicular to the first direction. A plurality of liquid distribution openings are arranged at equal intervals along the first direction on the plate body. The width of the liquid distribution opening in the first direction gradually increases from the middle to both ends along the second direction. The opposite ends of the plate body in the first direction are bent in a direction perpendicular to the plate body to form a first bending part, and the two first bending parts are located on the same side of the plate body; The opposite ends of the liquid distribution opening in the first direction are bent in a direction perpendicular to the plate body to form a second bending part, and the two second bending parts are both located on the same side as the first bending part; The interior of the cover body is hollow, and one end surface of the cover body has an opening. The distribution plate is located in the inner cavity of the cover body. The liquid storage tray is covered on the opening of the cover body and closes the opening of the cover body. A plurality of liquid storage members are arranged on the side surface of the liquid storage tray close to the distribution plate. The liquid distribution opening is arranged corresponding to the gap between two adjacent liquid storage members, and the width of the liquid distribution opening in the first direction is less than or equal to the distance between two adjacent corresponding liquid storage members. The liquid storage member is provided with an overflow hole penetrating through it. An inlet is penetrated through the other end surface opposite to one end surface of the cover body, and the inlet is located directly above the distribution plate.

2. The liquid storage type distributor according to claim 1, wherein The shape of the plate body is rectangular, the first direction is the width direction of the plate body, and the second direction is the length direction of the plate body.

3. The liquid storage type distributor according to claim 1, characterized in that, The shape of the liquid distribution opening is strip-shaped.

4. The liquid storage type distributor according to claim 1, wherein The bending degree range of the first bending part is 30°-60°.

5. The liquid storage type distributor according to claim 1, characterized in that, The liquid storage member includes a plurality of liquid storage protrusions arranged at equal intervals along the second direction.

6. The liquid storage type distributor according to claim 1, characterized in that, The inner wall of the overflow hole is provided with an anti-vortex structure, and the anti-vortex structure is a partition plate crossed in a cross shape.

7. The liquid storage type distributor according to claim 1, characterized in that, At the opening of the cover body, suction baffles are symmetrically arranged at the opposite ends in the first direction. The two suction baffles are inclined in a direction away from each other, and a plurality of exhaust through grooves are arranged on the suction baffles.

8. A falling film evaporator, characterized in that, It includes an evaporator cylinder body and the liquid storage type distributor according to claim 1. The liquid storage type distributor is located in the inner cavity of the evaporator cylinder body. A plurality of heat exchange components distributed in layers are further arranged in the inner cavity of the evaporator cylinder body, and the heat exchange components include a plurality of heat exchange tubes arranged along the first direction.

9. The falling film evaporator according to claim 8, characterized in that, The central position of the overflow hole is directly opposite to the axial center of the heat exchange tube in the first layer.

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