Membrane spraying assembly and heating evaporation kettle

Abstract

The utility model discloses a membrane spraying component and heating evaporation kettle, the membrane spraying component comprises a wall scraping and liquid spraying combined pipe, the wall scraping and liquid spraying combined pipe comprises a liquid spraying pipe and a scraper arranged on the liquid spraying pipe, the wall surface of the liquid spraying pipe is provided with a narrow slit liquid spraying port arranged along the axial direction of the liquid spraying pipe, and the scraper comprises a flat plate scraper. A knife edge parallel to the axis of the liquid spraying pipe is formed at the end, away from the liquid spraying pipe, of the flat scraper, the knife edge is close to a spraying path of the narrow-slit liquid spraying opening, and the spraying path of the narrow-slit liquid spraying opening and the scraper are not intersected. The membrane spraying assembly is novel in structure, different from the prior art that feed liquid flows from top to bottom, the heating evaporation kettle adopting the membrane spraying assembly can convey the feed liquid by utilizing the pressure of a fluid pump, the flow of the feed liquid is constant, the membrane forming consistency of the feed liquid sprayed out of the narrow slit liquid spraying opening is high, and the evaporation rate of the feed liquid is consistent; particularly, the heat transfer surface of the inner wall of the kettle can be kept clean due to the wall cleaning function of the scraper, so that the heat transfer between the heat transfer surface of the inner wall of the kettle and a feed liquid film is kept stable, and the evaporation rate of feed liquid is kept consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of scraping film evaporation equipment, in particular to a film spraying component and a heating evaporation kettle. Background Art

[0002] Evaporation-condensation separation technology is widely used in fine chemicals, Chinese medicine preparations, food engineering, solvent recovery, seawater desalination and other fields.

[0003] In a scraped film heating evaporator, the feed liquid is distributed through a liquid distributor on the top of the heating evaporator. Under the action of gravity, the feed liquid flows naturally from top to bottom on the heating surface of the heating evaporator to form a liquid film. The naturally flowing liquid film evaporates by heat transfer on the heat transfer surface of the inner wall of the heating evaporator. However, the naturally flowing liquid film is random and its uniformity is difficult to control. Therefore, in a scraped film heating evaporator, the evaporation rate of the feed liquid is random. The feed liquid is prone to scaling, crystallization and burning on the heat transfer surface of the inner wall of the kettle, especially for some feed liquids with higher viscosity, which are more likely to scale and crystallize on the heat transfer surface. After scaling and crystallization form on the heat transfer surface, the heat transfer efficiency is significantly reduced, and the evaporation rate of the feed liquid is also reduced accordingly. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a film spraying component capable of keeping the evaporation rate of liquid feed constant and a heating evaporating kettle with the film spraying component.

[0005] In order to solve the above technical problems, the first technical solution adopted by the utility model is: a film spraying assembly, including a wall-scraping and liquid-spraying combination pipe, the wall-scraping and liquid-spraying combination pipe includes a liquid spraying pipe and a scraper arranged on the liquid spraying pipe, the wall surface of the liquid spraying pipe has a narrow slit liquid spraying port arranged along its axial direction, the scraper includes a flat scraper, the flat scraper forms a blade parallel to the axis of the liquid spraying pipe at one end away from the liquid spraying pipe, the blade is close to the injection path of the narrow slit liquid spraying port, and the injection path of the narrow slit liquid spraying port has no intersection area with the scraper.

[0006] In one embodiment, the scraper further comprises an arc-shaped plate connected to the flat scraper, and the arc-shaped plate is fixed on the liquid spraying pipe.

[0007] In one embodiment, the flat scraper and the arc plate are an integral structure formed by integral processing, and the wall scraper and spray combination pipe also includes an arc pressure plate, which is fixed to the spray pipe by a locking screw, and the arc plate is clamped between the spray pipe and the arc pressure plate.

[0008] In one embodiment, a sealing threaded plug is provided at one end of the liquid spray pipe.

[0009] In one embodiment, the slit width of the narrow slit liquid spraying port is 1-5 mm.

[0010] In one embodiment, it also includes a connector having a passage inside, and the wall-scraping and spraying combination pipe also includes an elbow connecting pipe connected to the spraying pipe, and the elbow connecting pipe is connected to the connector at one end away from the spraying pipe. There are multiple wall-scraping and spraying combination pipes, and the multiple wall-scraping and spraying combination pipes are evenly distributed around the connector.

[0011] In one embodiment, it further comprises a rotating shaft, one end of which is connected to the connecting body, and a central axis of the rotating shaft is coaxially arranged with a rotation axis of the connecting body.

[0012] In one embodiment, the rotating shaft is a hollow tube.

[0013] In one embodiment, a solid bridge is further included, and the solid bridge connects the rotating shaft and the liquid spraying pipe.

[0014] In order to solve the above technical problems, the second technical solution adopted by the utility model is: a heating evaporator, including the above film spraying assembly.

[0015] The beneficial effects of the utility model are: the structure of the film spraying component is novel, different from the prior art, in which the feed liquid flows from top to bottom, and the heating evaporating kettle using the film spraying component can utilize the pressure of the fluid pump to convey the feed liquid, the feed liquid flow rate is constant, the film formation consistency of the feed liquid sprayed through the narrow slit liquid spray port is high, and the evaporation rate of the feed liquid is consistent; in particular, the wall cleaning function of the scraper can keep the heat transfer surface of the inner wall of the kettle body clean, so that the heat transfer between the heat transfer surface of the inner wall of the kettle body and the feed liquid film remains stable, and the evaporation rate of the feed liquid is kept consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic structural diagram of the wall scraping and liquid spraying combined pipe according to the first embodiment of the utility model;

[0018] Figure 2 It is a top view of the wall scraping and liquid spraying combined pipe of the first embodiment of the utility model;

[0019] Figure 3 It is a cross-sectional view of the liquid spraying pipe in the wall scraping liquid spraying combined pipe of the first embodiment of the utility model;

[0020] Figure 4This is a schematic structural diagram of a film spraying assembly according to Embodiment 1 of the present utility model;

[0021] Figure 5 It is a cross-sectional view of a "cross" tee flange in a spray film assembly according to Embodiment 1 of the utility model;

[0022] Figure 6 It is a cross-sectional view of the rotating shaft in the film spraying assembly of the first embodiment of the utility model;

[0023] Figure 7 This is a cross-sectional view of the heating evaporator according to the first embodiment of the present invention.

[0024] Description of Figure Numbers:

[0025] 1115, film spraying assembly; 11151, "cross" tee flange; 11151e, sealing plug; 11152, elbow connecting pipe; 11153, scraper spray combination pipe; 111531, spray pipe; 111531a, narrow slit spray port; 111531d, sealing threaded plug; 111532, scraper; 111532a, flat scraper; 111532b, arc plate; 111533, arc pressure plate; 111534, locking screw; 11154, rotating shaft; 11154a, hollow shaft; 11154c, connecting short shaft; 11155, solid bridge; 1200, kettle body; 1206, angular contact bearing; 1207, bottom bearing seat; 1210, support beam. DETAILED DESCRIPTION

[0026] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Embodiment 1

[0033] Please refer to Figures 1 to 7 , Embodiment 1 of the present utility model is: Figure 7 As shown, the heated evaporator includes a film spraying component 1115.

[0034] Please combine Figures 1 to 4The film spraying assembly 1115 includes a wall scraping and liquid spraying combination pipe 11153, the wall scraping and liquid spraying combination pipe 11153 includes a liquid spraying pipe 111531 and a scraper 111532 arranged on the liquid spraying pipe 111531, the wall surface of the liquid spraying pipe 111531 has a narrow liquid spraying port 111531a arranged along its axial direction, the narrow liquid spraying port 111531a faces the inner wall of the heating evaporator body 1200, and the feed liquid pumped to the liquid spraying pipe 111531 by the external fluid pump passes through the narrow liquid spraying port 111531a. 1531a is sprayed out, the scraper 111532 includes a flat scraper 111532a, and the flat scraper 111532a forms a blade parallel to the axis of the spray pipe 111531 at one end away from the spray pipe 111531, the blade is close to the spray path of the narrow slit spray port 111531a, and the spray path of the narrow slit spray port 111531a has no intersection area with the scraper 111532, and the blade of the scraper 111532 is tangent to the inner wall of the heating evaporator body 1200.

[0035] Specifically, the scraper 111532 also includes a curved plate 111532b connected to the flat scraper 111532a, the curved plate 111532b is fixed on the liquid spraying pipe 111531, and the curved plate 111532b is an installation area for the scraper 111532 to be installed on the liquid spraying pipe 111531. In this embodiment, the flat scraper 111532a and the curved plate 111532b are an integrated structure formed by integral processing, which can facilitate the processing and manufacturing of the scraper 111532.

[0036] Optionally, the wall scraping and spraying combined pipe 11153 further comprises an arc-shaped pressing plate 111533, which is fixed to the spraying pipe 111531 by a locking screw 111534, and the arc-shaped plate 111532b is clamped between the spraying pipe 111531 and the arc-shaped pressing plate 111533, thereby realizing the relative fixation of the scraper 111532 and the spraying pipe 111531. The liquid pipe 111531 is provided with a tightening threaded hole threadedly matched with the locking screw 111534, the arc plate 111532b is provided with a positioning and fastening hole for the locking screw 111534 to pass through, the arc pressure plate 111533 is provided with a locking hole for the locking screw 111534 to pass through, and one end of the locking screw 111534 passes through the locking hole and the positioning and fastening hole in sequence and is threadedly connected with the tightening threaded hole. It is easy to understand that the inner wall of the arc plate 111532b fits the outer wall of the liquid spray pipe 111531, and the inner wall of the arc pressure plate 111533 fits the outer wall of the arc plate 111532b.

[0037] In this embodiment, the number of the locking screws 111534 is 20, and the 20 locking screws 111534 are evenly distributed. The number of the pressing threaded holes is 20, and the 20 pressing threaded holes are evenly distributed on the spray pipe 111531. The axis of the pressing threaded holes is arranged along the radial direction of the spray pipe 111531. The number of the positioning and fastening holes is 20, and the 20 positioning and fastening holes are evenly distributed on the arc surface of the arc plate 111532b of the scraper 111532. The number of the locking holes is 20, and the 20 locking holes are evenly distributed on the arc surface of the arc pressure plate 111533. In other embodiments, the number of the locking screws 111534 can be set according to actual needs, and it is not necessarily 20. Accordingly, the number of the locking holes, the number of the positioning and fastening holes, and the number of the pressing threaded holes correspond to the number of the locking screws 111534, respectively.

[0038] To facilitate the cleaning of the internal space of the spray pipe 111531, preferably, a sealing threaded plug 111531d is provided at one end of the spray pipe 111531, and the other end of the spray pipe 111531 is a liquid inlet. In this embodiment, the top of the spray pipe 111531 is the liquid inlet, and the bottom end of the spray pipe 111531 is connected to a sealing threaded plug 111531d. When it is necessary to clean the internal space of the spray pipe 111531, the cleaning staff can rotate and remove the sealing threaded plug 111531d, so that the spray pipe 111531 can be cleaned more thoroughly.

[0039] The slit width of the narrow slit liquid spraying port 111531a is 1-5 mm. In this embodiment, the slit width of the narrow slit liquid spraying port 111531a is 2 mm.

[0040] Please combine Figure 4 and Figure 5 The film spraying assembly 1115 also includes a connector having an internal passage, and the connector can be rotatably arranged on the kettle body 1200 of the heating evaporator. The wall-scraping and liquid-spraying combination pipe 11153 also includes an elbow connecting pipe 11152 connected to the liquid-spraying pipe 111531, and the elbow connecting pipe 11152 is connected to the connector at one end away from the liquid-spraying pipe 111531. The number of the wall-scraping and liquid-spraying combination pipes 11153 is multiple, and the multiple wall-scraping and liquid-spraying combination pipes 11153 are evenly distributed around the connector. The number of the wall-scraping and liquid-spraying combination pipes 11153 can be selected according to factors such as the size of the kettle body 1200. For example, in this embodiment, the number of the wall-scraping and liquid-spraying combination pipes 11153 is two, and the two wall-scraping and liquid-spraying combination pipes 11153 are symmetrically distributed on the left and right.

[0041] In this embodiment, a top threaded section is provided at the top of the liquid spraying pipe 111531, and the elbow connecting pipe 11152 is sealedly connected to the liquid spraying pipe 111531 via the top threaded section.

[0042] Optionally, the connector is a cross tee flange 11151, which includes a liquid inlet flange, a right-hand liquid outlet flange, a left-hand liquid outlet flange, a bottom connecting flange and a sealing plug 11151e; the elbow connecting pipe 11152 in one of the wall scraping and spraying combination pipes 11153 is connected to the right-hand liquid outlet flange of the cross tee flange 11151 to connect the cross tee flange 11151 and the spraying pipe 111531 connected thereto, and the elbow connecting pipe 11152 in another of the wall scraping and spraying combination pipes 11153 is connected to the left-hand liquid outlet flange of the cross tee flange 11151 to connect the cross tee flange 11151 and the spraying pipe 111531 connected thereto.

[0043] When the film spraying assembly 1115 rotates, the feed liquid is sprayed from the narrow slit liquid spraying port 111531a to the inner wall heat transfer surface of the kettle body 1200 of the heating evaporating kettle, and is distributed in a film-like manner on the inner wall heat transfer surface of the kettle body 1200. The film-like distributed feed liquid absorbs heat from the inner wall heat transfer surface of the kettle body 1200 of the heating evaporating kettle and evaporates under the heat. When the film spraying assembly 1115 rotates, the scraper 111532 rotates synchronously with the liquid spraying pipe 111531, and the blade continuously scrapes and cleans the inner wall heat transfer surface of the kettle body 1200 of the heating evaporating kettle, so that the feed liquid contacts the clean heat transfer surface, avoids the feed liquid remaining on the inner wall heat transfer surface of the kettle body 1200 of the heating evaporating kettle from forming a crust to form a thermal resistance, and prevents the feed liquid from being continuously heated on the heat transfer surface and coking and denaturing.

[0044] Please combine Figures 4 to 6 The film spraying assembly 1115 further includes a rotating shaft 11154, which is rotatably connected to the kettle body 1200 of the heating evaporating kettle, one end of which is connected to the connecting body, and the central axis of the rotating shaft 11154 is coaxially arranged with the rotating shaft 11154 of the connecting body, that is, in this embodiment, the film spraying assembly 1115 is in the shape of a trident as a whole. The arrangement of the rotating shaft 11154 enables the film spraying assembly 1115 to be supported by the kettle body 1200 of the heating evaporating kettle, so that the film spraying assembly 1115 can perform a rotating operation more stably.

[0045] In this embodiment, the top of the rotating shaft 11154 has an axial end flange, and the bottom end connecting flange of the "cross" three-way flange 11151 is installed in a plane-fitting manner with the axial end flange. It is easy to understand that the sealing plug 11151e is used to close the port of the "cross" three-way flange 11151 connected to one end of the rotating shaft 11154, so as to prevent the liquid from flowing out of the port. Preferably, the sealing plug 11151e has a guiding end, and the guiding end is used to guide the liquid in the "cross" three-way flange 11151 to be evenly divided into two streams and enter the two wall scraping and spraying combined pipes 11153 respectively.

[0046] In this embodiment, the rotating shaft 11154 is a hollow tube, specifically, the rotating shaft 11154 includes a hollow shaft 11154a and a connecting short shaft 11154c, wherein the upper end of the connecting short shaft 11154c is wedged into the inner hole of the bottom end of the hollow shaft 11154a with an interference tolerance. Compared with a solid shaft, the hollow shaft 11154a can reduce the driving rotation load and improve the rigidity of the rotating shaft 11154.

[0047] Please combine Figure 6 and Figure 7 In detail, a support beam 1210 is provided in the kettle body 1200 of the heating evaporating kettle, and the support beam 1210 is fixedly connected to the kettle body 1200 of the heating evaporating kettle. In this embodiment, the number of the support beams 1210 is four, and the lengths of the four support beams 1210 are equal. The four support beams 1210 are arranged in a cross shape and have an intersection position, and the intersection position is located directly below the rotating shaft 11154. A bottom bearing seat 1207 is provided at the intersection position, and an angular contact bearing 1206 is installed on the bottom bearing seat 1207. The lower end of the connecting short shaft 11154c is installed in the inner hole of the angular contact bearing 1206, so as to keep the rotating shaft 11154 of the film spraying assembly 1115 at the rotation center. The angular contact bearing 1206 has the function of being able to bear the radial load of the hollow shaft 11154a and the axial load of the hollow shaft 11154a at the same time, so that the weight load of the film spraying pipe assembly matches it.

[0048] Please combine Figure 4 and Figure 7The film spraying assembly 1115 also includes a solid bridge 11155 , and the solid bridge 11155 connects the rotating shaft 11154 and the liquid spraying pipe 111531 . Specifically, the solid bridge 11155 includes a waist plate, which is provided with a sleeve shaft hole, a right positioning hole and a left positioning hole. A sealing threaded plug 111531d on one of the spray pipes 111531 passes through the right positioning hole and is screwed into the bottom end inner hole of the spray pipe 111531, so that the solid bridge 11155 is fixed to the spray pipe 111531. Another sealing threaded plug 111531d on the spray pipe 111531 passes through the left positioning hole and is screwed into the bottom end inner hole of the spray pipe 111531, so that the solid bridge 11155 is fixed to the spray pipe 111531. The top end of the connecting short shaft 11154c passes through the sleeve shaft hole and is connected and fixed to the hollow shaft 11154a. It can be seen that the solid bridge 11155 stabilizes the rotating shaft 11154 and the two spray pipes 111531, which is beneficial to improving the structural stability of the film spraying assembly 1115.

[0049] Preferably, the solid bridge 11155 also includes two symmetrical legs arranged opposite to each other, and the two symmetrical legs are respectively connected to the two long sides of the waist plate. That is to say, at this time, the solid bridge 11155 is a groove structure. The solid bridge 11155 with a groove structure has high rigidity and strength, and can improve the structural stability of the spray film assembly 1115 to a greater extent.

[0050] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The film spraying assembly is characterized by: It comprises a wall-scraping liquid-spraying combined pipe, which comprises a liquid spraying pipe and a scraper arranged on the liquid spraying pipe, wherein the wall surface of the liquid spraying pipe is provided with a narrow liquid spraying port arranged along its axial direction, and the scraper comprises a flat scraper, wherein the flat scraper forms a blade parallel to the axis of the liquid spraying pipe at one end away from the liquid spraying pipe, the blade is close to the injection path of the narrow liquid spraying port, and the injection path of the narrow liquid spraying port has no intersection area with the scraper.

2. The film spraying assembly according to claim 1, characterized in that: The scraper also includes an arc plate connected to the flat scraper, and the arc plate is fixed on the liquid spraying pipe.

3. The film spraying assembly according to claim 2, characterized in that: The flat scraper and the arc plate are an integral structure formed by integral processing. The wall scraper and liquid spraying combination pipe also includes an arc pressure plate, which is fixed to the liquid spraying pipe by locking screws. The arc plate is clamped between the liquid spraying pipe and the arc pressure plate.

4. The film spraying assembly according to claim 1, characterized in that: A sealing thread plug is provided at one end of the liquid spray pipe.

5. The film spraying assembly according to claim 1, characterized in that: The slit width of the narrow slit liquid spraying port is 1-5 mm.

6. The film spraying assembly according to claim 1, characterized in that: It also includes a connector with a passage inside, and the wall-scraping and spraying combination pipe also includes an elbow connecting pipe connected to the spraying pipe, and the elbow connecting pipe is connected to the connector at one end away from the spraying pipe. There are multiple wall-scraping and spraying combination pipes, and the multiple wall-scraping and spraying combination pipes are evenly distributed around the connector.

7. The film spraying assembly according to claim 6, characterized in that: It also includes a rotating shaft, one end of which is connected to the connecting body, and the central axis of the rotating shaft is coaxially arranged with the rotating axis of the connecting body.

8. The film spraying assembly according to claim 7, characterized in that: The rotating shaft is a hollow tube.

9. The film spraying assembly according to claim 7, characterized in that: It also includes a solid bridge, which connects the rotating shaft and the liquid spraying pipe.

10. Heating evaporator, characterized in that: The invention comprises the spray film assembly as described in any one of claims 1 to 9.

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