Online backwashing device for circulating water plate heat exchanger
Through the design of the filter and backwash pipeline of the online backwash device, the problems of water quality deterioration and pipeline scale blockage in the circulating water plate heat exchanger are solved, and efficient cleaning and resource saving are achieved.
Patent Information
- Application Number
- CN202323619565.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-27
AI Technical Summary
In the existing circulating water plate heat exchanger, due to the deterioration of water quality and pipeline scaling and blockage caused by long-term use and separation components, the existing filters cannot effectively solve the problems of smaller particle size impurities and blockage cleaning.
An online backwashing device was designed, adopting a dual design of filter and backwashing pipeline. The filter initially filters large impurities. The backwashing structure can independently select the flushing direction, and use the cold source outlet low-temperature medium to reverse impact scale and clean. The path coincides with the heat exchange path, improving cleaning efficiency and reducing resource waste.
Effectively improve pipeline scaling, eliminate blockage problems, use flexible and thoroughly clean, and reduce resource waste.
Smart Images
Figure CN222231426U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchange, in particular to an online backwashing device for a circulating water plate heat exchanger. Background Art
[0002] Plate heat exchangers are an important part of cooling equipment. They usually use water or oil flow to exchange heat with the heat medium in the heat exchanger for cooling. The specific process is: first, the refrigerant enters the manifold, and then enters the cold source channel from the manifold. Then, the refrigerant exchanges heat with the heat source medium in the heat source channel during the flow process, thereby achieving cooling or heating. Usually there are multiple cold source channels, and ideally, the refrigerant should be evenly distributed to each cold source channel to ensure the best heat exchange efficiency of the heat exchanger. However, in actual use, the cold source channel is mostly slender and tubular. During the flow of the refrigerant, it is affected by the resistance in the cold source channel, making the refrigerant flow uneven, resulting in a large difference in the refrigerant flow at the inlet and outlet of the cold source channel. To this end, the patent announcement number "WO2015027783A1" "Microchannel heat exchanger and its manufacturing method" discloses a heat exchanger, which uses a Y-shaped partition component extending axially in the manifold to evenly distribute the refrigerant to multiple relatively independent circulation chambers, and the refrigerant in each circulation chamber circulates relatively independently, so that the influence of the internal resistance of the manifold on the flow of the refrigerant can be greatly reduced. However, although this type of heat exchanger can solve the problem of more uniform distribution, the original refrigerant (i.e., circulating water) is used repeatedly for a long time in the manifold and the cold source channel, which is easy to cause the deterioration of the circulating water quality, not to mention that a partition component is set in the pipeline, the flow port is narrowed, and dirt is more likely to accumulate at the corners. In addition, these dirts are continuously compacted when the liquid flows through, which will further induce the problem of scaling and blockage of the circulation pipeline; the heat source channel will obviously also have the same problem. People have considered arranging filters to solve the above problems, but on the one hand, the filter has a limited pore size and cannot filter impurities with smaller particle sizes; on the other hand, when the filter itself is clogged, it is impossible to clean it or it must be disassembled for cleaning, which is time-consuming and laborious. Therefore, it is urgent to solve this problem. Summary of the invention
[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide an online backwashing device for a circulating water plate heat exchanger, which can effectively improve the scaling phenomenon of the pipeline until the pipeline is blocked and has the advantages of being easy and flexible to use.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] An online backwashing device for a circulating water plate heat exchanger comprises a main pipeline flowing through a heat exchange chamber, wherein the main pipeline is divided into a heat source pipeline connected to a heat medium source and a cold source pipeline connected to a cold medium source; the device is characterized in that:
[0006] Along the flow direction, inlet pipelines and outlet pipelines are formed at both ends of the main pipeline, and the first valve is provided at the inlet pipeline and the outlet pipeline; the interface between the main pipeline and the heat exchange dish is divided into an inlet point and an outlet point, an inlet node is arranged on the pipeline between the inlet pipeline and the inlet point, and an outlet node is arranged on the pipeline between the outlet pipeline and the outlet point; it also includes a backwash pipeline, and the backwash pipeline includes a cleaning main channel, one end of the cleaning main channel is connected to the cold medium source through a filter, and the other end is connected to two cleaning branches, the two cleaning branches are respectively connected to the corresponding outlet nodes, the inlet nodes are connected to the sewage branch channels, the cleaning branches are provided with a third valve, and the sewage branch channels are provided with a fourth valve.
[0007] Preferably, the cold medium source is a water tank, a connection node is arranged on the pipeline between the inlet pipeline and the first valve, the connection node is connected to the cleaning main channel, and the filter is located between the connection node and the cold medium source.
[0008] Preferably, a main cleaning valve is provided on the main cleaning channel.
[0009] Preferably, the filter includes a quadrilateral outer shell, the inner cavity of the outer shell constitutes a filter cavity for the medium to pass through; a filter plate is arranged in the filter cavity to divide the filter cavity into an inlet cavity and an outlet cavity, the filter plate surface is in an inclined plate shape and the angle formed with the bottom wall of the inlet cavity points in the direction of the outlet cavity; an opening is provided on the outer shell to accommodate a slag collecting drawer, which is inserted into the inlet cavity along the bottom of the inlet cavity to receive the filter residue dropped from the filter plate surface.
[0010] Preferably, a vertical wall is arranged between the bottom of the filter plate and the bottom wall of the inlet cavity, and the vertical wall forms a guide wall for the slag collecting drawer to perform a reciprocating pulling action.
[0011] Preferably, the slag collecting drawer forms a sealed fitting relationship with the vertical wall and the opening of the outer shell.
[0012] Preferably, thermometers are installed at the inlet and outlet of the heat source pipeline.
[0013] Preferably, the outlet end of the sewage branch channel is connected to the ditch manhole in the factory area.
[0014] The beneficial effects of the utility model are:
[0015] Through the above scheme, the utility model adopts a dual design structure of filter plus backwash. During actual work, on the one hand, the filtering structure of the filter is used to preliminarily filter impurities with larger particle sizes in the pipeline to achieve a coarse filtration effect. On the other hand, the backwash structure is set up, which can not only independently choose to flush any pipeline according to needs, but also has high practicality; at the same time, because the flushing direction is opposite to the heat exchange flow direction, the reverse cleaning can change the direction to impact the weak adhesion position of the scale, so that the scale is loosened and the cleaning efficiency is high. In addition, the backwash structure directly uses the cold source outlet as the flushing inlet and is connected to the supply source for providing low-temperature medium; in this way, the cleaning path completely overlaps with the heat exchange path, which is very flexible to use, and the cleaning is more thorough, and the existing cooling medium is directly used for flushing, which reduces the problem of resource waste.
[0016] Thus, the utility model can effectively improve the scaling phenomenon of the pipeline, until the pipeline blockage problem is eliminated, and has the advantages of being convenient and flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the pipeline arrangement of the utility model;
[0018] Figure 2 A partial working state diagram of one of the usage scenarios of the utility model;
[0019] Figure 3 It is a schematic diagram of the structure of the filter of the utility model.
[0020] The actual correspondence between the reference numbers and component names of the utility model is as follows:
[0021] A-inlet pipeline; a1-inlet node; a2-connection node; B-outlet pipeline; b1-outlet node;
[0022] 10-heat exchange dish;
[0023] 21-heat source pipeline; 22-cold source pipeline; 23-first valve;
[0024] 31-cleaning main channel; 32-cleaning branch channel; 33-main cleaning valve; 34-third valve; 35-fourth valve; 36-sewage branch channel;
[0025] 40-filter; 41-outer shell; 42-filter plate; 42a-vertical wall; 43-slag collecting drawer;
[0026] 50-Cold medium source. DETAILED DESCRIPTION
[0027] For ease of understanding, here we combine Figure 1-3 The specific structure and working mode of the utility model are further described as follows:
[0028] The specific implementation structure of the utility model refers to Figure 1 As shown, it is designed around the heat exchange dish 10 and is laid out based on the existing main pipeline.
[0029] The main pipeline includes a heat source pipeline 21 and a cold source pipeline 22. The heat source pipeline 21 is connected to the hot medium source, and the cold source pipeline 22 is connected to the cold medium source 50. When the main pipeline is connected to the heat exchange dish 10, the pipe body exposed at both ends of the heat exchange dish 10 is naturally divided into an inlet pipeline A and an outlet pipeline B.
[0030] When designing, refer to Figure 1 As shown, the utility model arranges nodes between the heat exchange dish 10 and the first valve 23, that is, an inlet node a1 is arranged between the heat exchange dish 10 and the first valve 23 of the inlet pipeline A, and an outlet node b1 is arranged between the heat exchange dish 10 and the first valve 23 of the outlet pipeline B. Subsequently, relying on the connection node a2 located at the outlet of the cold medium source 50, a cleaning main channel 31 is formed for the medium to pass through the connection node a2 to the backwash pipeline, and then divided into two and respectively pass through the cleaning branch channel 32 with the third valve 34, and finally enter the corresponding inlet backwashing structure of the outlet node b1. Subsequently, since the sewage branch channel 36 with the fourth valve 35 is arranged at the inlet node a1, the purpose of outlet backwashing is achieved. Of course, the main cleaning valve 33 is arranged on the cleaning main channel 31, which plays the role of a main valve.
[0031] Furthermore, a filter 40 is provided at the outlet of the cold medium source 50. The specific installation position and structure refer to Figure 1 and Figure 3 The outer shell 41 of the filter 40 is in the shape of a square box, and an opening is arranged on it so as to facilitate the quick extraction of the slag collecting drawer 43. Figure 3 The filter plates 42 are obliquely distributed as shown, and the front side of the filter plates 42, i.e., the side facing the cold medium source 50, must face downward, and finally point to the opening of the slag collecting drawer 43, so that the slag collecting drawer 43 can receive the filter residue conveniently, and the purpose of the filter plates 42 falling off by themselves due to gravity and liquid flow can be ensured. Figure 3 In the figure, the distribution position of the vertical wall 42a can be seen, so that the slag collecting drawer 43 can be quickly pulled out; considering the sealing effect, a sealing ring or a sealing strip etc. needs to be arranged between the slag collecting drawer 43 and the vertical wall 42a or even the opening.
[0032] The actual workflow of this utility model refers to Figure 1-3 As shown, the details are as follows:
[0033] When the utility model is actually working, it is divided into two states: first, the heat exchange state, the first valve 23 is opened, and the third valve 34 is closed, so that the medium in the two main pipes can flow normally, and heat exchange is performed in the heat exchange dish 10. Second, the backwash state, at this time, the first valve 23 is closed, and the backwash state is divided into the following situations: Situation 1, only flushing the heat source pipe 21 or only flushing the cold source pipe 22, the principle is the same, so taking only flushing the heat source pipe 21 as an example, Figure 2 As shown: Here, the cleaning branch 32 is divided into a cold washing branch connected to the cold source pipe 22, and a hot washing branch connected to the heat source pipe 21; the sewage branch 36 is divided into a cold sewage channel connected to the cold source pipe 22, and a hot sewage channel connected to the heat source pipe 21. Open the valves on the hot washing branch and the hot sewage channel, and close the valves on the cold washing branch and the cold sewage channel. At this time, the cold medium source 50 connects the cleaning main channel 31, the hot washing branch, the heat source pipe 21 and the hot sewage channel to form a passage for flushing. In the second case, the heat source pipe 21 and the cold source pipe 22 are cleaned at the same time, then all the third valves 34 and the fourth valves 35 can be opened. Through the above cleaning, first, the flushing state can be selected independently according to needs, which is highly practical. Second, the flushing direction is opposite to the heat exchange flow direction. Reverse cleaning can change the direction to impact the weak adhesion position of the scale, so that the scale is loosened, and the cleaning efficiency is high. Third, the cold source outlet is directly used as the flushing inlet and connected to the supply source for providing the low-temperature medium. In this way, the cleaning path and the heat exchange path completely overlap, the cleaning is more thorough, and the existing cooling medium is directly used for flushing, reducing the problem of resource waste.
[0034] On the basis of the above, the filter 40 always bears the function of coarse filtering of the medium; when it is used for a period of time or when it is shut down for maintenance periodically, the slag collecting drawer 43 can be pulled out to quickly clean the filter residue after coarse filtering; and the slag collecting drawer 43 can be reset later. Figure 3 The inclined layout shown in the figure enables the filter residue to naturally fall into the residue collecting drawer 43 under its own weight and the impact of the liquid flow during operation, thereby achieving convenient residue collection and subsequent cleaning effects, and is very flexible and convenient to use.
[0035] Of course, for those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, but also includes the same or similar methods that can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the attached claims rather than the above description.
[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
[0037] The technical parts not described in detail in the present invention are all known technologies.
Claims
1. An online backwashing device for a circulating water plate heat exchanger, comprising a main pipeline flowing through a heat exchange dish (10) cavity, wherein the main pipeline is divided into a heat source pipeline (21) connected to a heat medium source, and a cold source pipeline (22) connected to a cold medium source (50); characterized in that: Along the flow direction, the two ends of the main pipeline form an inlet pipeline (A) and an outlet pipeline (B), and the inlet pipeline (A) and the outlet pipeline (B) are both provided with a first valve (23); the interface between the main pipeline and the heat exchange dish (10) is divided into an inlet point and an outlet point, an inlet node (a1) is arranged on the pipeline between the inlet pipeline (A) and the inlet point, and an outlet node (b1) is arranged on the pipeline between the outlet pipeline (B) and the outlet point; and a backwash pipeline is also included, the backwash pipeline The flushing pipeline comprises a main cleaning channel (31), one end of which is connected to a cold medium source (50) via a filter (40), and the other end of which is connected in parallel to two branch cleaning channels (32), the two branch cleaning channels (32) being connected to corresponding outlet nodes (b1) respectively, and the inlet nodes (a1) being connected to sewage branch channels (36), the cleaning branch channels (32) being provided with a third valve (34), and the sewage branch channels (36) being provided with a fourth valve (35).
2. The online backwashing device for a circulating water plate heat exchanger according to claim 1, characterized in that: The cold medium source (50) is a water tank, a connection node (a2) is arranged on the pipeline between the inlet pipeline (A) and the first valve (23), the connection node (a2) is connected to the cleaning main channel (31), and the filter (40) is located between the connection node (a2) and the cold medium source (50).
3. The online backwashing device for a circulating water plate heat exchanger according to claim 2, characterized in that: The main cleaning channel (31) is provided with a main cleaning valve (33).
4. An online backwashing device for a circulating water plate heat exchanger according to any one of claims 1 to 3, characterized in that: The filter (40) comprises a square-shaped outer shell (41), the inner cavity of the outer shell (41) constituting a filter cavity through which a medium can pass; a filter plate (42) is arranged in the filter cavity so as to divide the filter cavity into an inlet cavity and an outlet cavity; the plate surface of the filter plate (42) is in an inclined plate shape and the angle formed with the bottom wall of the inlet cavity points in the direction of the outlet cavity; an opening is provided on the outer shell (41) so as to accommodate a slag collecting drawer (43); the slag collecting drawer (43) is inserted into the inlet cavity along the bottom of the inlet cavity and is used to receive filter residue dropped from the plate surface of the filter plate (42).
5. The online backwashing device for a circulating water plate heat exchanger according to claim 4, characterized in that: A vertical wall (42a) is arranged between the bottom of the filter plate (42) and the bottom wall of the inlet cavity, and the vertical wall (42a) forms a guide wall for the slag collecting drawer (43) to perform reciprocating pulling and pulling movements.
6. The online backwashing device for circulating water plate heat exchanger according to claim 5, characterized in that: The slag collecting drawer (43) forms a sealed matching relationship with the vertical wall (42a) and the opening of the outer shell (41).
7. An online backwashing device for a circulating water plate heat exchanger according to any one of claims 1 to 3, characterized in that: Thermometers are installed at the inlet and outlet of the heat source pipeline (21).
8. An online backwashing device for a circulating water plate heat exchanger according to any one of claims 1 to 3, characterized in that: The outlet end of the sewage branch channel (36) is connected to the factory area ditch manhole.