CN112539514A - Water resistance detection device and method for fan coil - Google Patents
Water resistance detection device and method for fan coil Download PDFInfo
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- CN112539514A CN112539514A CN202011474452.5A CN202011474452A CN112539514A CN 112539514 A CN112539514 A CN 112539514A CN 202011474452 A CN202011474452 A CN 202011474452A CN 112539514 A CN112539514 A CN 112539514A
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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Abstract
The invention provides a water resistance detection device and method for a fan coil, wherein the device comprises a water source and a pressure measurement device. The water source is respectively connected with the water inlet end and the water outlet end of the fan coil through connecting pipelines, and a water inlet valve and a water outlet valve are respectively arranged between the water source and the water inlet end and the water outlet end of the fan coil. The pressure measuring device is respectively arranged at the water inlet end and the water outlet end of the fan coil. The device and the method provided by the invention can realize direct water resistance detection of the fan coil, find and control problems at the source, and reflect the friction resistance condition of liquid flowing in the internal thread pipe through the line body water resistance of the water pressure loss values of the water inlet end and the water outlet end.
Description
Technical Field
The invention relates to the technical field of air conditioner detection, in particular to a water resistance detection device and method for a fan coil.
Background
The fan coil is an important end device in an air-conditioning heat exchange system, and the working principle of the fan coil is that the heat exchange with the outside air is realized by chilled water or hot water in a flowing state in the coil pipe, so that the effect of adjusting indoor air parameters is achieved. The performance of the fan coil is mainly embodied in three aspects of heat transfer coefficient, wind side resistance and water side resistance.
Among them, water resistance is one of the important factors affecting heat exchange efficiency. Because the chilled water or hot water flowing in the coil pipe has liquid viscosity, liquid particles are attached to the pipe wall of the copper pipe at the position of close contact with the pipe wall. Therefore, when chilled water or hot water flows in the pipe wall, the flow velocity of water flow on the same section is not completely consistent, the actual flow velocity of liquid in the pipe is increased from the zero value of the contact surface of the pipe wall to the main flow velocity value, and a certain liquid flow velocity gradient is formed locally. When the water flow and the wall of the copper pipe move relatively, the component force of the interaction force between the water flow and the contact surface along the moving direction and the friction force between adjacent liquid flow layers caused by the flow velocity gradient in the liquid caused by the component force are the water resistance. The liquid flows in the coil pipe, and the frictional resistance generated by the pipe wall to the coil pipe causes the pressure difference between the water inlet end and the water outlet end to be called the pressure loss of water.
The water resistance in the coil pipe is too large, so that the flow of frozen water or hot water in the system is too slow, the water circulation speed is lower than the wind circulation speed, and the heat exchange efficiency is reduced; the water resistance in the coil pipe is too small, the heat exchange area is small, and the heat exchange efficiency of the air conditioning system can be reduced by too fast flow of chilled water or hot water.
The magnitude of the water resistance is often influenced by a plurality of aspects, and the resistance of the water in the pipeline can be represented by the formula f ═ c ρ v2/a (c-resistance coefficient, ρ -density and a-effective cross-sectional area) by analogy with the resistance formula of 'the resistance of air proportional to the square of the velocity when the object moves' in theoretical mechanics. The effective cross-sectional area a of the copper pipe is reduced due to inner wall welding beading and unqualified bending flattening rate of the long bent pipe caused in the production and processing processes of the coil pipe and the surface cooler; the increase in helix angle and surface oxidation of the threaded pipe results in an increase in the coefficient of resistance c, which in turn results in an increase in the water resistance of the coil.
The traditional air conditioner blockage detection method adopts a flow and pressure detection method, and the friction resistance generated by the influence of the pipe wall of liquid in a threaded pipe or other factors cannot be reflected by a gas pressure and flow calculation method. In addition, the water resistance test method of the fan coil in the air conditioning industry is to test the performance of the whole fan coil together with the performance of the whole fan coil after the whole fan coil is assembled, and the hydraulic resistance test of the fan coil does not reach the standard, so that a large amount of manpower and material resources are required to be spent for rectification and modification.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a water resistance detection device and a water resistance detection method for a fan coil, which can realize direct water resistance detection of the fan coil, find and control problems at the source, reflect the friction resistance condition of liquid flowing in an inner threaded pipe through the water pressure loss value line body water resistance of a water inlet end and a water outlet end, and realize the quick assembly of the fan coil and the water resistance detection device through the arrangement of a sealing quick connector.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a water resistance detection device for a fan coil comprises a water source and a pressure measurement device. The fan coil is arranged in the water tank, the water inlet end and the water outlet end of the fan coil are connected with the water source through connecting pipelines, and a water inlet valve and a water outlet valve are arranged between the water source and the water inlet end and the water outlet end of the fan coil respectively. The pressure measuring device is respectively arranged at the water inlet end and the water outlet end of the fan coil.
According to the water resistance detection device for the fan coil, disclosed by the invention, the device can be directly butted with the fan coil, circulating water flow is formed between the detected fan coil and a water source, the water pressure drop is calculated through the pressure measurement value of the pressure measurement device at the water inlet end and the water outlet end of the fan coil, namely the water resistance value, the water resistance value is simply and quickly tested on the fan coil on site, and therefore, the condition that no quality hidden trouble exists in the fan coil is reflected, and the problem is found and controlled at a production source.
With respect to the above technical solution, further improvements as described below can be made.
According to the water resistance detection device for the fan coil, a water pump is arranged between a water source and the water inlet end of the fan coil.
Through setting up the water pump, can ensure to provide stable rivers pressure during the test, adjust operating mode discharge through water pump and the cooperation control of water intaking valve switch.
Further, in a preferred embodiment, a flow measuring device is also provided between the water source and the water inlet end of the fan coil.
Through setting up flow measuring device, can cooperate with the water pump control more accurately to adjust and detect operating mode discharge meter and fan coil intake end water pressure.
In particular, in a preferred embodiment, the water pump is a variable frequency water pump and the flow measuring means comprises a flow meter.
The frequency conversion water pump can ensure accurate regulation water flow and fan coil intake end water pressure to a great extent, and flow measuring device adopts the flowmeter, and simple structure is convenient for arrange and detect operation, and the cooperation frequency conversion water pump can realize that discharge is adjustable well and numerical value changes.
Specifically, in a preferred embodiment, the connection pipes are connected to the water inlet end and the water outlet end of the fan coil respectively through sealed quick-connect fittings.
The sealing quick connector with the proper pipe diameter is adopted to be in butt joint with the fan coil, so that the quick installation, butt joint and disassembly between the detection device and the detected fan coil are conveniently realized.
Specifically, in a preferred embodiment, the pressure measuring device comprises a digital display pressure measuring meter, and the digital display pressure measuring meter is butted with a pressure measuring port reserved on the connecting pipeline by adopting a quick plug connector.
The digital display pressure test meter can enable the detection data to be obtained visually in the detection process, and the digital display pressure test meter and the reserved pressure test buckle can be conveniently and quickly butted and disassembled through the quick plug-in connector.
Specifically, in a preferred embodiment, the pressure accuracy of the digital display pressure test meter is 1 kPa.
The digital display pressure test meter in the precision range can ensure the accuracy of pressure measurement to a great extent.
In particular, in a preferred embodiment, the water supply is stored by a water tank.
Through water tank deposit water source, can enough ensure the simple structure of device, have and can ensure to provide the water source and form stable circulating water flow in the testing process steadily.
According to the second aspect of the invention, the method for detecting the water resistance of the fan coil is implemented by using the water resistance detection device, and comprises the following steps: and S01, butting the water resistance detection device with the fan coil. And S02, after the power supply is switched on, measuring pressure test data of the water inlet end and the water outlet end of the fan coil by at least twice rising and falling water pressure, and calculating the water pressure difference of the water inlet end and the water outlet end of the fan coil. And S03, comparing the water pressure difference data obtained by calculation with preset standard data to judge whether the fan coil is qualified.
According to the water resistance detection method for the fan coil, the connecting pipeline is in butt joint with the water inlet end and the water outlet end of the fan coil through the sealing quick-connection joints with proper pipe diameters, the water inlet pressure value and the water outlet pressure value are respectively obtained through the digital display pressure test meters arranged at the water inlet end and the water outlet end, the water pressure difference data is calculated, the water resistance of the fan coil is obtained, the water resistance is compared with the preset standard data, and whether the fan coil is qualified or not is judged. The whole detection process is simple and convenient, the test result is accurate, and the quality of the fan coil can be controlled from the source.
With respect to the above technical solution, further improvements as described below can be made.
In a preferred embodiment of the method for detecting water resistance of a fan coil according to the present invention, in step S02, before the power is turned on, the water inlet valve and the water outlet valve are closed to form a closed system, and the closed system is vacuumized.
Because among the detection device, the digital display pressure test table junction copper pipe is single tube butt joint pressure test table, inserts the rivers in-process and can't guarantee that the air in the copper pipe is the evacuation completely, influences the pressure test result, consequently carries out rethread water test after the evacuation to the test circuit before logical water to invert the digital display pressure test table junction copper pipe when logical water, ensure rivers can be with the intraductal air escape.
Further, in a preferred embodiment, in step S02, the water flow rate is adjusted in the states of full opening of the water inlet valve and the water outlet valve, half opening of the water inlet valve and the water outlet valve, full opening of the water inlet valve and the water outlet valve, and half opening of both the water inlet valve and the water outlet valve, respectively, and the water flow rate and the water inlet pressure are adjusted by the variable frequency water pump.
The water pressure difference of the water inlet end and the water outlet end is measured after the system pressure is raised and lowered for multiple times, so that the detection result of the fan coil can be comprehensively reflected, and the detection accuracy is ensured.
Compared with the prior art, the invention has the advantages that: can realize directly carrying out the water resistance to fan coil and detecting, discover and control the problem at the source, through water inlet end water pressure loss value line body water resistance, and then reflect the liquid and flow the frictional resistance condition that receives in the internal thread pipe, through setting up sealed quick-operation joint, realize fan coil and water resistance detection device's rapid Assembly.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates a frame structure of a water resistance detecting device for a fan coil according to an embodiment of the present invention;
fig. 2 schematically shows the frame principle of the water resistance detecting device for a fan coil according to the embodiment of the present invention.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
Fig. 1 schematically shows a frame structure of a water resistance detecting device 10 for a fan coil according to an embodiment of the present invention. Fig. 2 schematically shows the frame principle of the water resistance detecting device 10 for a fan coil according to the embodiment of the present invention.
Example 1
As shown in fig. 1 and 2, a water resistance detection device 10 for a fan coil according to an embodiment of the present invention includes a water source 1 and a pressure measurement device 2. The water source 1 is connected with the water inlet end and the water outlet end of the fan coil 4 through the connecting pipeline 3, and a water inlet valve 5 and a water outlet valve are arranged between the water source 1 and the water inlet end and the water outlet end of the fan coil 4 respectively. The pressure measuring device 2 is respectively arranged at the water inlet end and the water outlet end of the fan coil 4.
According to the water resistance detection device for the fan coil, which is disclosed by the embodiment of the invention, the device can be directly butted with the fan coil, circulating water flow is formed between the fan coil to be detected and a water source, and the water pressure drop, namely the water resistance value, is calculated through the pressure measurement value of the pressure measurement device at the water inlet end and the water outlet end of the fan coil, so that the water resistance value can be simply and quickly tested on the fan coil on site, the condition that no quality hidden trouble exists in the fan coil is reflected, and the problem is found and controlled at a production source.
Specifically, as shown in fig. 1 and 2, in the present embodiment, a water source 1 is reserved through a water tank. Through water tank deposit water source, can enough ensure the simple structure of device, have and can ensure to provide the water source and form stable circulating water flow in the testing process steadily.
As shown in fig. 1 and 2, preferably, in this embodiment, a water pump 6 is provided between the water source 1 and the water inlet end of the fan coil 4. Through setting up the water pump, can ensure to provide stable rivers pressure during the test, adjust operating mode discharge through water pump and the cooperation control of water intaking valve switch. Further, in the present embodiment, a flow measuring device 7 is further provided between the water source 1 and the water inlet end of the fan coil 4. Through setting up flow measuring device, can cooperate with the water pump control more accurately to adjust and detect operating mode discharge meter and fan coil intake end water pressure. Specifically, in the present embodiment, the water pump 6 is a variable frequency water pump, and the flow rate measurement device 7 includes a flow meter. The frequency conversion water pump can ensure accurate regulation water flow and fan coil intake end water pressure to a great extent, and flow measuring device adopts the flowmeter, and simple structure is convenient for arrange and detect operation, and the cooperation frequency conversion water pump can realize that discharge is adjustable well and numerical value changes.
Specifically, in this embodiment, the connection pipe 3 is connected to the water inlet end and the water outlet end of the fan coil 4 through the sealed quick-connection joints, respectively. The sealing quick connector with the proper pipe diameter is adopted to be in butt joint with the fan coil, so that the quick installation, butt joint and disassembly between the detection device and the detected fan coil are conveniently realized.
Specifically, in this embodiment, the pressure measurement device 2 includes a digital display pressure measurement meter, and the digital display pressure measurement meter is butted with a pressure measurement port reserved on the connection pipeline by using a quick plug connector. The digital display pressure test meter can enable the detection data to be obtained visually in the detection process, and the digital display pressure test meter and the reserved pressure test buckle can be conveniently and quickly butted and disassembled through the quick plug-in connector. Specifically, in the present embodiment, the pressure accuracy of the digital display pressure test meter is 1 kPa. The digital display pressure test meter in the precision range can ensure the accuracy of pressure measurement to a great extent. Preferably, the pipe diameter of the connecting pipe 3 is 25D, and the pipe diameter of the connecting pipe 3 close to the water inlet end of the fan coil 4 is 10D.
Example 2
As shown in fig. 1 and fig. 2, the method for detecting water resistance of a fan coil according to an embodiment of the present invention is implemented by using the above-mentioned water resistance detection device 10, and specifically includes the following steps: and S01, butting the water resistance detection device 10 with the fan coil 4. And S02, after the power supply is switched on, measuring pressure test data of the water inlet end and the water outlet end of the fan coil 4 by at least twice increasing and decreasing the water inlet pressure, and calculating the water pressure difference of the water inlet end and the water outlet end of the fan coil 4. And S03, comparing the water pressure difference data obtained by calculation with preset standard data to judge whether the fan coil is qualified.
According to the water resistance detection method for the fan coil, disclosed by the embodiment of the invention, the connecting pipeline is butted with the water inlet end and the water outlet end of the fan coil through the sealed quick-connection joint with the proper pipe diameter, the water inlet pressure value and the water outlet pressure value are respectively obtained through the digital display pressure test meters arranged at the water inlet end and the water outlet end, and the water resistance of the fan coil is obtained by calculating water pressure difference data and is compared with the preset standard data so as to judge whether the fan coil is qualified. The whole detection process is simple and convenient, the test result is accurate, and the quality of the fan coil can be controlled from the source.
Specifically, in this embodiment, a water resistance and pressure difference change rule of the detection device is obtained by comparing test data, and a pressure loss correction coefficient and a calculation formula f ═ c ρ v are obtained by combining theoretical analysis and research2A (c-drag coefficient, rho-density, a-effective cross-sectional area). The water resistance test standard of the fan coil is corresponding standard data measured in a laboratory by each model, the data measured on site is compared with the standard data, and if the numerical value deviation is overlarge, the fan coil is unqualified.
Further, in this embodiment, in step S02, before the power is turned on, the water inlet valve and the water outlet valve are closed to form a closed system, and the closed system is vacuumized.
Because among the detection device, the digital display pressure test table junction copper pipe is single tube butt joint pressure test table, inserts the rivers in-process and can't guarantee that the air in the copper pipe is the evacuation completely, influences the pressure test result, consequently carries out rethread water test after the evacuation to the test circuit before logical water to invert the digital display pressure test table junction copper pipe when logical water, ensure rivers can be with the intraductal air escape.
Specifically, in this embodiment, in step S02, the water flow rate is adjusted in the states of full opening of the water inlet valve and the water outlet valve, half opening of the water inlet valve and the water outlet valve, full opening of the water inlet valve and the water outlet valve, and half opening of both the water inlet valve and the water outlet valve, respectively, and the water flow rate and the water inlet pressure are adjusted by the variable frequency water pump. The water pressure difference of the water inlet end and the water outlet end is measured after the system pressure is raised and lowered for multiple times, so that the detection result of the fan coil can be comprehensively reflected, and the detection accuracy is ensured.
According to the embodiment, the water resistance detection device and the water resistance detection method for the fan coil can be used for directly detecting the water resistance of the fan coil, finding and controlling problems at the source, reflecting the friction resistance condition of liquid flowing in the inner threaded pipe through the line body water resistance of the water pressure loss values of the water inlet end and the water outlet end, and realizing the quick assembly of the fan coil and the water resistance detection device by arranging the sealing quick connector.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A water resistance detection device for a fan coil is characterized by comprising a water source and a pressure measurement device; wherein the content of the first and second substances,
the water source is respectively connected with the water inlet end and the water outlet end of the fan coil through connecting pipelines, and a water inlet valve and a water outlet valve are respectively arranged between the water source and the water inlet end and the water outlet end of the fan coil;
the pressure measuring device is respectively arranged at the water inlet end and the water outlet end of the fan coil.
2. The water resistance detection device for a fan coil of claim 1, wherein a water pump is disposed between the water source and the water inlet end of the fan coil.
3. The water resistance detection device for a fan coil of claim 2, further comprising a flow measurement device between the water source and the water inlet end of the fan coil.
4. The water resistance detection device for a fan coil of claim 3, wherein the water pump is a variable frequency water pump and the flow measurement device comprises a flow meter.
5. The water resistance detection device for a fan coil as recited in any of claims 1-4, wherein the connection duct is connected to the water inlet end and the water outlet end of the fan coil by a sealed quick connect fitting, respectively.
6. The water resistance detection device for the fan coil according to any one of claims 1 to 4, wherein the pressure measurement device comprises a digital display pressure test meter, and the digital display pressure test meter is in butt joint with a pressure test port reserved on the connecting pipeline by adopting a quick plug-in connector.
7. The water resistance detection device for a fan coil of claim 6, wherein the pressure accuracy of the digital display pressure test meter is 1 kPa.
8. A water resistance detection method for a fan coil, which is implemented by using the water resistance detection device of any one of claims 1 to 7, is characterized by comprising the following steps:
s01, butting the water resistance detection device with a fan coil;
s02, after the power is switched on, the water inlet end and the water outlet end of the fan coil are measured by rising and falling the water inlet pressure for at least two times
Pressure test data of the water end is obtained, and the water pressure difference between the water inlet end and the water outlet end of the fan coil is calculated;
and S03, comparing the water pressure difference data obtained by calculation with preset standard data to judge whether the fan coil is qualified.
9. The method as claimed in claim 8, wherein in step S02, the water inlet valve and the water outlet valve are closed to form a closed system and the closed system is vacuumized before the power is turned on.
10. The method as claimed in claim 8 or 9, wherein in step S02, the water flow is adjusted in a state where the water inlet valve and the water outlet valve are fully opened, the water inlet valve is half opened and the water outlet valve is fully opened, the water inlet valve is fully opened and the water outlet valve is half opened, and the water inlet valve and the water outlet valve are both half opened, and the water flow and the water inlet pressure are adjusted by a variable frequency water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474452.5A CN112539514A (en) | 2020-12-14 | 2020-12-14 | Water resistance detection device and method for fan coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011474452.5A CN112539514A (en) | 2020-12-14 | 2020-12-14 | Water resistance detection device and method for fan coil |
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| CN112539514A true CN112539514A (en) | 2021-03-23 |
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| CN202011474452.5A Pending CN112539514A (en) | 2020-12-14 | 2020-12-14 | Water resistance detection device and method for fan coil |
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| CN (1) | CN112539514A (en) |
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2020
- 2020-12-14 CN CN202011474452.5A patent/CN112539514A/en active Pending
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