CN110715566A - Shell-and-tube heat exchanger, air conditioning unit and descaling method - Google Patents
Shell-and-tube heat exchanger, air conditioning unit and descaling method Download PDFInfo
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- CN110715566A CN110715566A CN201911030929.8A CN201911030929A CN110715566A CN 110715566 A CN110715566 A CN 110715566A CN 201911030929 A CN201911030929 A CN 201911030929A CN 110715566 A CN110715566 A CN 110715566A
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- shell
- pipeline
- heat exchanger
- tube heat
- descaling
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Abstract
The invention relates to a shell and tube heat exchanger, an air conditioning unit and a descaling method, wherein the shell and tube heat exchanger comprises: the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline; the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline; and the controller is used for controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted under a descaling mode so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger. The technical scheme provided by the invention can realize physical descaling, avoid the corrosion problem of chemical descaling on the shell-and-tube heat exchanger, prolong the service life of the shell-and-tube heat exchanger, reduce the maintenance cost and improve the customer experience.
Description
Technical Field
The invention relates to the technical field of air conditioning units, in particular to a shell-and-tube heat exchanger, an air conditioning unit and a descaling method.
Background
At present, a shell-and-tube heat exchanger is adopted as a mainstream evaporator of a module machine, and the shell-and-tube heat exchanger has the advantages of high stability, good anti-freezing effect, high heat exchange efficiency, mature and relatively simple manufacturing process, small refrigerant amount and low cost. But shell and tube heat exchanger is in the use, and the incrustation scale that long-time operation produced is attached to on the pipeline easily, and the heat transfer effect of evaporimeter can greatly reduce, causes the water route resistance to increase simultaneously, and user water pump energy consumption increases.
At present, the method for solving the scale generated by the shell-tube evaporator is mainly to add a scale remover in a water path to regularly remove the scale of the shell tube, but the scale remover has a corrosion effect on a copper tube, can corrode the copper tube for a long time, reduces the service life of a unit and also increases the maintenance cost.
Disclosure of Invention
In view of the above, the present invention provides a shell-and-tube heat exchanger, an air conditioning unit and a descaling method, so as to solve the problems of large energy consumption and reduced unit life caused by chemical descaling of the shell-and-tube heat exchanger in the prior art.
According to a first aspect of embodiments of the present invention, there is provided a shell and tube heat exchanger comprising:
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline;
and the controller is used for controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted under a descaling mode so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger.
Preferably, the descaling pipeline comprises:
the first pipeline is provided with a first electromagnetic valve and a first one-way valve which are connected in series;
the second pipeline is provided with a second electromagnetic valve and a second one-way valve which are connected in series;
the third pipeline is provided with a third electromagnetic valve, one end of the third pipeline is communicated with the water inlet of the shell and tube heat exchanger, and the other end of the third pipeline is communicated with the second pipeline;
and the fourth pipeline is provided with a fourth electromagnetic valve, one end of the fourth pipeline is communicated with an external refrigerant supply end through the first pipeline, and the other end of the fourth pipeline is communicated with a water outlet of the shell-and-tube heat exchanger.
Preferably, the water inlet and outlet circulation pipeline is provided with:
the fifth electromagnetic valve is used for controlling whether the refrigerant flows into the water inlet of the shell and tube heat exchanger or not;
and the sixth electromagnetic valve is used for controlling whether the refrigerant flows out of the water outlet of the shell and tube heat exchanger or not.
Preferably, the first check valve and the second check valve are both spring-type check valves.
According to a second aspect of the embodiments of the present invention, there is provided an air conditioning unit, including:
the shell and tube heat exchanger described above.
According to a third aspect of the embodiments of the present invention, there is provided a descaling method for a shell-and-tube heat exchanger, including:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
Preferably, the method further comprises:
and in a non-descaling mode, only the water inlet and outlet circulation pipeline is controlled to be communicated.
Preferably, the controlling the water inlet and outlet circulation pipeline and the descaling pipeline to be alternately conducted comprises:
and after the water inlet and outlet circulation pipeline is controlled to be conducted for a first preset time, the water inlet and outlet circulation pipeline is controlled to be closed, and the descaling pipeline is controlled to be conducted.
Preferably, the control of closing the water inlet and outlet circulation pipeline and the control of conducting the descaling pipeline specifically comprise:
and controlling the water inlet and outlet circulation pipeline to be closed and controlling the descaling pipeline to be conducted within a time period less than a second preset time period.
According to a fourth aspect of the embodiments of the present invention, there is provided a shell-and-tube heat exchanger including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn to make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside obtain cleaing away, reach the effect that just can disassemble the scale removal. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic structural view of a shell and tube heat exchanger in accordance with an exemplary embodiment;
fig. 2 is a schematic diagram illustrating a configuration of an air conditioning unit according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic structural view of a shell and tube heat exchanger according to an exemplary embodiment, which, as shown in fig. 1, includes:
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline;
and the controller is used for controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted under a descaling mode so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger.
It should be noted that the technical solution provided in this embodiment is applicable to electrical equipment that needs to use a shell and tube heat exchanger, for example, an air conditioning unit.
The second direction is opposite to the first direction, and may be a clockwise direction of the first direction and a counterclockwise direction of the second direction.
It can be understood that, the technical scheme that this embodiment provided, through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn, thereby make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside clear away, reach the effect that just can the scale removal without disassembling. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
Referring to fig. 1, preferably, the descaling line includes:
the first pipeline is provided with a first electromagnetic valve 9 and a first one-way valve 11 which are connected in series;
the second pipeline is provided with a second electromagnetic valve 10 and a second one-way valve 12 which are connected in series;
a third pipeline, on which a third electromagnetic valve 8 is arranged, one end of which is communicated with the water inlet of the shell and tube heat exchanger and the other end of which is communicated with the second pipeline;
and a fourth pipeline, on which a fourth electromagnetic valve 13 is arranged, one end of which is communicated with an external refrigerant supply end through the first pipeline, and the other end of which is communicated with a water outlet of the shell-and-tube heat exchanger.
Referring to fig. 1, preferably, the water inlet and outlet circulation pipeline is provided with:
the fifth electromagnetic valve 7 is used for controlling whether the refrigerant flows into a water inlet of the shell and tube heat exchanger or not;
and the sixth electromagnetic valve 14 is used for controlling whether the refrigerant flows out of a water outlet of the shell and tube heat exchanger.
Preferably, the first check valve 11 and the second check valve 12 are both spring-type check valves.
Referring to fig. 1, in the non-descaling mode, the electromagnetic valves 7 and 14 are opened, the electromagnetic valves 8, 9, 10 and 13 are closed, that is, the water inlet and outlet circulation pipelines are connected, the descaling pipelines are closed and not connected, at this time, the refrigerant in the shell and tube heat exchanger flows clockwise, the refrigerant enters from the water inlet of the shell and tube heat exchanger through the electromagnetic valve 7, then exits from the water outlet of the shell and tube heat exchanger through the electromagnetic valve 14, and the operation is repeated.
After the operation is carried out for the first preset time, the descaling mode is started, the electromagnetic valves 8, 9, 10 and 13 are adjusted from the closed state to the open state, the electromagnetic valves 7 and 14 are changed from the open state to the closed state, namely, the water inlet and outlet circulation pipelines are closed and not conducted, the descaling pipelines are conducted, at the moment, the refrigerant in the shell and tube heat exchanger flows anticlockwise, and after entering from the water outlet of the shell and tube heat exchanger along the electromagnetic valves 9, the one-way valve 11 and the electromagnetic valves 13, the refrigerant flows out of the shell and tube heat exchanger through the electromagnetic valves 8 and 10 and the one-way valve 12, and is circulated in a reciprocating manner.
It can be understood that, since the refrigerant flow direction of the whole system is rapidly changed from clockwise to counterclockwise, a recoiling fluid force is formed, and the impact force is large. Because the process takes place very fast and can take place always in the operation process, then entire system can produce the fluid force (bionical pulsation power) of recoil always, and the strength of this bionical pulsation power is used in the pipeline, can make the scale of dry-type shell and tube wall the inside clear away, reaches the effect that just can the scale removal need not disassemble the unit.
Referring to fig. 2, an air conditioning unit according to an exemplary embodiment of the present invention is shown, including:
the shell and tube heat exchanger described above.
In fig. 2, 1 represents a compressor; 2 represents a condenser; 3 represents an electronic expansion valve; 4 represents a shell-and-tube heat exchanger; 5 represents a four-way valve; and 6 represents a gas-liquid separator.
Since the components represented by 1 to 6 belong to the existing components of the air conditioning unit, the technical solution provided in this embodiment does not improve the existing components, and therefore the working principle of the components represented by 1 to 6 is not described herein again.
It can be understood that, the technical scheme that this embodiment provided, through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn, thereby make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside clear away, reach the effect that just can the scale removal without disassembling. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
A method of descaling a shell and tube heat exchanger according to an exemplary embodiment of the present invention includes:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
It should be noted that the technical solution provided in this embodiment is applicable to electrical equipment that needs to use a shell and tube heat exchanger, for example, an air conditioning unit.
The second direction is opposite to the first direction, and may be a clockwise direction of the first direction and a counterclockwise direction of the second direction.
It can be understood that, the technical scheme that this embodiment provided, through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn, thereby make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside clear away, reach the effect that just can the scale removal without disassembling. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
Preferably, the method further comprises:
and in a non-descaling mode, only the water inlet and outlet circulation pipeline is controlled to be communicated.
Preferably, the controlling the water inlet and outlet circulation pipeline and the descaling pipeline to be alternately conducted comprises:
and after the water inlet and outlet circulation pipeline is controlled to be conducted for a first preset time, the water inlet and outlet circulation pipeline is controlled to be closed, and the descaling pipeline is controlled to be conducted.
Preferably, the control of closing the water inlet and outlet circulation pipeline and the control of conducting the descaling pipeline specifically comprise:
and controlling the water inlet and outlet circulation pipeline to be closed and controlling the descaling pipeline to be conducted within a time period less than a second preset time period.
It should be noted that the first preset time period and the second preset time period are set according to historical experience values or experimental data. The first preset time is as long as possible so as to ensure that the unit enters a descaling mode after normal operation is stable, and the second preset time is as short as possible so as to ensure that the backflushing fluid force generated in the unit is as large as possible so as to flush scale on the pipe wall of the shell-and-tube heat exchanger.
Preferably, the second preset time period is less than the first preset time period.
It can be understood that, the technical scheme that this embodiment provided, through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn, thereby make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside clear away, reach the effect that just can the scale removal without disassembling. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
A shell and tube heat exchanger is shown according to an exemplary embodiment of the invention, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
It can be understood that, the technical scheme that this embodiment provided, through under the scale removal mode, control business turn over water circulation pipeline and scale removal pipeline switch on in turn, thereby make the flow direction of refrigerant change rapidly in the entire system, form the fluid power of a recoil, and this impact force can be very big, because above-mentioned process takes place very fast and can take place always, then entire system can produce the water wave of pulsation form always, the strength of this bionical pulsation power is used in the pipeline, can make the scale of shell and tube heat exchanger pipe wall the inside clear away, reach the effect that just can the scale removal without disassembling. In addition, the technical scheme provided by the invention is physical descaling, so that the problem of corrosion of the shell-tube heat exchanger caused by chemical descaling is avoided, the service life of the shell-tube heat exchanger is prolonged, the maintenance cost is reduced, and the customer experience is improved.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A shell and tube heat exchanger, comprising:
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline;
and the controller is used for controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted under a descaling mode so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger.
2. The descaling line according to claim 1, wherein the descaling line comprises:
the first pipeline is provided with a first electromagnetic valve and a first one-way valve which are connected in series;
the second pipeline is provided with a second electromagnetic valve and a second one-way valve which are connected in series;
the third pipeline is provided with a third electromagnetic valve, one end of the third pipeline is communicated with the water inlet of the shell and tube heat exchanger, and the other end of the third pipeline is communicated with the second pipeline;
and the fourth pipeline is provided with a fourth electromagnetic valve, one end of the fourth pipeline is communicated with an external refrigerant supply end through the first pipeline, and the other end of the fourth pipeline is communicated with a water outlet of the shell-and-tube heat exchanger.
3. The descaling pipeline according to claim 1, wherein the water inlet and outlet circulation pipeline is provided with:
the fifth electromagnetic valve is used for controlling whether the refrigerant flows into the water inlet of the shell and tube heat exchanger or not;
and the sixth electromagnetic valve is used for controlling whether the refrigerant flows out of the water outlet of the shell and tube heat exchanger or not.
4. The descaling line of claim 2,
the first one-way valve and the second one-way valve are spring-type one-way valves.
5. An air conditioning assembly, comprising:
the shell and tube heat exchanger of any one of claims 1 to 4.
6. A descaling method for a shell-and-tube heat exchanger is characterized by comprising the following steps:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
7. The method of claim 6, further comprising:
and in a non-descaling mode, only the water inlet and outlet circulation pipeline is controlled to be communicated.
8. The method as claimed in claim 6, wherein the controlling the water inlet and outlet circulation lines and the descaling lines to be alternately conducted comprises:
and after the water inlet and outlet circulation pipeline is controlled to be conducted for a first preset time, the water inlet and outlet circulation pipeline is controlled to be closed, and the descaling pipeline is controlled to be conducted.
9. The method as claimed in claim 8, wherein the controlling of the water inlet and outlet circulation pipeline to be closed and the controlling of the descaling pipeline to be conducted are specifically:
and controlling the water inlet and outlet circulation pipeline to be closed and controlling the descaling pipeline to be conducted within a time period less than a second preset time period.
10. A shell and tube heat exchanger, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in a descaling mode, controlling the water inlet and outlet circulation pipelines and the descaling pipelines to be alternately conducted so as to generate water waves in a pulsating mode capable of cleaning scale on the pipe wall in the shell-and-tube heat exchanger;
the water inlet and outlet circulation pipeline is used for controlling the refrigerant in the shell and tube heat exchanger to flow in a first direction through the on-off of the water inlet and outlet circulation pipeline;
the descaling pipeline is connected between a water inlet and a water outlet of the shell and tube heat exchanger and used for controlling the refrigerant in the shell and tube heat exchanger to flow in a second direction opposite to the first direction through the on-off of the descaling pipeline.
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| CN201911030929.8A CN110715566A (en) | 2019-10-28 | 2019-10-28 | Shell-and-tube heat exchanger, air conditioning unit and descaling method |
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| CN201911030929.8A CN110715566A (en) | 2019-10-28 | 2019-10-28 | Shell-and-tube heat exchanger, air conditioning unit and descaling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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