CN116499534A - Automatic capillary flow matching simulation measuring device - Google Patents
Automatic capillary flow matching simulation measuring device Download PDFInfo
- Publication number
- CN116499534A CN116499534A CN202310373957.XA CN202310373957A CN116499534A CN 116499534 A CN116499534 A CN 116499534A CN 202310373957 A CN202310373957 A CN 202310373957A CN 116499534 A CN116499534 A CN 116499534A
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- Prior art keywords
- controller
- pressure
- temperature
- expansion valve
- electronic expansion
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- 238000004088 simulation Methods 0.000 title claims abstract description 9
- 230000008054 signal transmission Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004781 supercooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses an automatic matching simulation measuring device for capillary flow, which comprises a controller, a flowmeter, a first pressure sensor, a second pressure sensor, a first temperature sensor, a second temperature sensor and an electronic expansion valve for replacing a capillary, wherein the controller controls the opening of the electronic expansion valve based on data acquired by the temperature sensor and the pressure sensor, and the optimal flow of the capillary is simulated and measured through the flowmeter. The invention can automatically match and measure the optimal flow of the capillary according to the set temperature and pressure values, and has the advantages of high matching precision, high speed, short test time, high efficiency and less effort of designers.
Description
Technical Field
The invention relates to a capillary tube matching experimental device, in particular to an automatic capillary tube flow matching simulation measuring device.
Background
The traditional method for matching the capillary flow in the laboratory is to firstly manufacture a plurality of groups of capillaries with different flow according to calculation and experience for standby. In the laboratory matching process, according to the data of each temperature point of the refrigerating system, the real-time measured refrigerating capacity, consumed power and inlet and outlet air temperature are combined, whether the capillary connected to the refrigerating system is matched is comprehensively judged, and the judgment of whether the capillary is replaced is made. Until the best matching capillary is selected.
The traditional method for matching the capillary tube has higher requirements on calculation and experience, and the optimal flow range of the capillary tube must be accurately calculated. Because the capillary material is matched, a limited flow point can be selected to manufacture a capillary test piece only in the calculated optimal flow range, the coverage of the tested capillary flow is not wide, the adjustment is rough, and the precision is not high. If the calculation is wrong, experience is insufficient, the matching test is failed, so that economic loss is caused, and development progress is delayed. Meanwhile, the traditional capillary tube matching method is long in test time consumption, and the designer consumes much effort in the test process. Every time the capillary tube is replaced, the tested refrigerating system is stopped, and the test is interrupted. The operation steps for replacing the capillary tube are complicated. After the capillary tube is replaced, the tested refrigerating system is restarted, the environmental working condition of the laboratory needs to be recovered, and after the tested refrigerating system operates stably, the judgment on the matching effect of the capillary tube flow can be made, so that the time and the labor are wasted, and the efficiency is low.
Disclosure of Invention
The invention provides an automatic capillary flow matching simulation measuring device, which aims to solve the problems of low efficiency and difficulty in ensuring precision in the capillary matching method in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the automatic capillary flow matching simulation measuring device is characterized by comprising a controller, a flowmeter, a first pressure sensor, a second pressure sensor, a first temperature sensor, a second temperature sensor and an electronic expansion valve for replacing a capillary, wherein one end of the electronic expansion valve is connected with an external condenser outlet through the flowmeter, the other end of the electronic expansion valve is connected with an external evaporator inlet, the first pressure sensor collects pressure data of medium flowing out of the condenser outlet, the first temperature sensor collects temperature data of medium flowing out of the condenser outlet, the second pressure sensor collects pressure data of medium flowing out of the evaporator outlet, the second temperature sensor collects temperature data of medium flowing out of the evaporator outlet, and the flowmeter, the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor are respectively and electrically connected with a controller in a signal transmission mode, and the controller is electrically connected with the electronic expansion valve in a control mode.
Further, the controller is also electrically connected with a key.
Further, the controller is also electrically connected with the screen.
In the invention, the pressure sensor and the temperature sensor are used for collecting pressure and temperature data at the access point, converting the pressure and temperature data into electric signals and transmitting the electric signals to the controller. The electronic expansion valve is used for replacing capillary material, and the opening of the electronic expansion valve is controlled and regulated by the controller, so that the flow of the refrigerant flowing through the electronic expansion valve is regulated, and the refrigeration system is matched. The turbine flowmeter monitors the flow of the refrigerant flowing through the electronic expansion valve in real time and feeds back a flow signal to the controller. The controller adjusts the opening of the electronic expansion valve according to the set target values of the pressure and the temperature of the medium flowing out of the outlet of the evaporator or the pressure and the temperature of the medium flowing out of the outlet of the condenser, and continuously reduces the difference between the acquired pressure and the temperature value and the target values of the set pressure and the temperature value until the acquired pressure and the temperature value are consistent with the target values of the set pressure and the temperature value. When the acquired pressure and temperature values are consistent with the set pressure and temperature target values, the flow acquired by the flowmeter is the optimal capillary flow which needs to be obtained.
Compared with the prior art, the invention has the advantages that:
the device for matching the flow of the capillary tube of the refrigerating system can automatically match and measure the optimal flow of the capillary tube according to the set temperature and pressure values. The method has the advantages of high matching precision, high speed, short test time, high efficiency and less effort of designers. The flow of the capillary tube does not need to be estimated, and the calculation and experience requirements are low. The capillary flow rate can be finely adjusted within a wide range. And a capillary sample is not required to be manufactured, so that the material and labor cost is reduced. The test process does not need to stop for replacing the capillary tube and recovering the test working condition, so that the uninterrupted continuous test can be ensured, the test time is shortened, and the test cost is reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of an application of an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, the embodiment discloses an automatic capillary flow matching simulation measuring device, which comprises an electronic expansion valve 1, a turbine flowmeter 2, a first pressure sensor 3, a controller 4, a first thermocouple 5, a manual control box 6, a second thermocouple 7 and a second pressure sensor 8.
The electronic expansion valve 1 is used for replacing a capillary tube, one end of the electronic expansion valve 1 is connected with the outlet end of the turbine flowmeter 2 through a pipeline, and the inlet end of the turbine flowmeter 2 is connected with the outlet of a condenser in the compressor refrigeration cycle through a pipeline. The other end of the electronic expansion valve 1 is connected with an inlet of an evaporator in a compressor refrigeration cycle through a pipeline.
The first pressure sensor 3 is connected to the pipeline at the inlet end of the turbine flowmeter 2 in a bypass mode and used for collecting pressure data of medium flowing out of the outlet of the condenser, and the first thermocouple 5 serving as a temperature sensor is arranged on the pipeline at the inlet end of the turbine flowmeter 2 and used for collecting temperature data of medium flowing out of the outlet of the condenser.
The second pressure sensor 8 is connected to the evaporator outlet pipeline in a bypass mode and used for collecting pressure data of medium flowing out of the evaporator outlet, and the second thermocouple 7 serving as a temperature sensor is arranged on the evaporator outlet pipeline and used for collecting temperature data of medium flowing out of the evaporator outlet.
The turbine flowmeter 2, the first pressure sensor 3, the first thermocouple 5, the second pressure sensor 8 and the second thermocouple 7 are respectively and electrically connected with a signal input port of the controller 4, a signal output port of the controller 4 is electrically connected with a control end of the electronic expansion valve 1, flow, pressure and temperature data are received by the controller 1, and the opening degree of the electronic expansion valve is controlled by the controller 1.
The manual control box 6 is provided with a key and a screen, the key is electrically connected with a signal input port of the controller 4, and the screen is electrically connected with a signal output port of the controller 4.
As shown in fig. 2, the present embodiment is connected to a compressor refrigeration cycle to perform a measurement simulation experiment. The compressor refrigeration cycle loop comprises a compressor 9, a condenser 10 and an evaporator 11, wherein an outlet of the compressor 9 is connected with an inlet of the condenser 10 through a pipeline, an outlet of the condenser 10 is connected with an inlet end of the turbine flowmeter 2 in the embodiment through a pipeline, an inlet of the evaporator 11 is connected with the other end of the electronic expansion valve 1 in the embodiment through a pipeline, and an outlet of the evaporator 11 is connected with a return port of the compressor 9 through a pipeline.
The first pressure sensor 3 is used for collecting pressure data of medium flowing out of the outlet of the condenser, the second pressure sensor 8 is used for collecting pressure data of medium flowing out of the outlet of the evaporator, the first thermocouple 5 is used for collecting temperature data of medium flowing out of the outlet of the condenser, the second thermocouple 7 is used for collecting temperature data of medium flowing out of the outlet of the evaporator, and the pressure data and the temperature data are converted into electric signals and then transmitted to the controller 4. The electronic expansion valve 1 is used for replacing capillary material objects, and matching of a refrigerating system is performed under the control of the controller 4. The turbine flowmeter 2 monitors the flow rate of the refrigerant flowing through the electronic expansion valve 1 in real time, and feeds back a flow rate signal to the controller 4. After receiving the flow signal, the controller 4 sends a signal to the display screen of the manual control box 6, and the flow is displayed on the display screen of the manual control box 6.
The controller 4 controls the operation of the components. The controller 4 has two working modes, namely an automatic mode and a manual mode, and one of the two working modes can be selected to operate through the keys of the manual control box 6. In the automatic mode, the controller 4 can select the pressure and the temperature value of the outlet of the evaporator or the pressure and the temperature value of the outlet of the condenser as target values through keys of the manual control box 6, compares the pressure and the temperature values acquired by the first pressure sensor 3, the second pressure sensor 8, the first thermocouple 5 and the second thermocouple 7 with the set pressure and the set temperature target values, sends an opening signal to the electronic expansion valve 1, adjusts the opening of the electronic expansion valve 1, and continuously reduces the difference value between the acquired pressure and the acquired temperature values and the set pressure and the temperature target values until the acquired pressure and the acquired temperature values are consistent with the set pressure and the set temperature target values. The display screen of the hand control box 6 is used for displaying signals sent by the controller 4. The keys of the manual box 6 are used to input the set evaporator outlet temperature and pressure data and condenser outlet temperature and pressure data to the controller 4.
In the present invention, the automatic mode or the manual mode can be selected by the keys of the manual control box 6. The controller 4 receives a signal from the hand control box 6 to operate the selected mode.
In the automatic mode, the basis value of the opening of the expansion valve is selected and adjusted by using the key of the control box 6, and the basis value is the value of the outlet temperature of the evaporator and the pressure of the outlet of the evaporator or the value of the outlet temperature of the condenser and the pressure of the outlet of the condenser. The set evaporator outlet temperature and pressure values of the evaporator outlet, or the condenser outlet temperature and pressure values are then input to the controller 4 with the keys of the control box 6. After the refrigeration system is started, the controller 4 compares the evaporator outlet temperature and pressure data or the condenser outlet temperature and pressure values acquired by the first pressure sensor 3, the second pressure sensor 8, the first thermocouple 5 and the second thermocouple 7 with set temperature and pressure target values, sends a signal to the electronic expansion valve 1, controls the opening of the electronic expansion valve 1, and displays the evaporator outlet temperature and pressure data and the condenser outlet temperature and pressure data on a display screen of the manual control box 6 in real time. The controller 4 sends a correction signal to the electronic expansion valve 1 through continuously collecting data and comparing data, and corrects the opening degree of the expansion valve, so that the collected temperature and pressure data gradually tend to be consistent with the set temperature and pressure values.
The turbine flowmeter 2 monitors the flow rate of the refrigerant flowing through the electronic expansion valve in real time, feeds back a flow rate signal to the controller 4, and after receiving the flow rate signal, the controller 4 sends a signal to the display screen of the manual control box 6 to display the flow rate on the display screen of the manual control box 6. When the acquired evaporator outlet temperature and pressure data are consistent with the set values, the controller 4 controls the opening of the electronic expansion valve 1 to be stable, and at the moment, the flow acquired by the turbine flowmeter 2 is the optimal capillary flow, and the optimal capillary flow is displayed on the display screen of the manual control box 6.
In the whole operation process of the automatic capillary flow matching and measuring device, the controller 4 converts the superheat degree of the refrigerant at the outlet of the evaporator according to the acquired temperature and pressure data of the outlet of the evaporator, converts the supercooling degree of the refrigerant at the outlet of the condenser according to the acquired temperature and pressure data of the outlet of the condenser, displays the supercooling degree on a display screen of the manual control box 6 in real time, and continuously refreshes the display screen to provide a reference for a designer to judge the operation condition of the refrigerating system. In the matching test process, the set evaporator outlet temperature and the pressure value of the evaporator outlet or the set condenser outlet temperature and the set pressure value can be modified and reset through the keys of the manual control box 6, and the shutdown is not needed.
In the manual mode, an opening instruction is sent to the controller 4 through + -keys of the manual control box 6, and the controller 4 drives the electronic expansion valve 1 to respond to the corresponding opening after receiving the instruction. At this time, the display screen of the manual control box 6 continuously displays the data of the outlet temperature and the pressure of the evaporator and the data of the outlet temperature and the pressure of the condenser, and converts the superheat degree and the supercooling degree for reference when a designer adjusts the opening of the electronic expansion valve 1. The controller 4 receives the signal from the turbine flowmeter 2, and continuously displays the real-time flow rate of the refrigerant flowing through the electronic expansion valve 1 on the display screen of the manual control box 6. Until a satisfactory result is obtained and the optimum flow rate of the capillary is measured.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, and the examples described herein are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. The individual technical features described in the above-described embodiments may be combined in any suitable manner without contradiction, and such combination should also be regarded as the disclosure of the present disclosure as long as it does not deviate from the idea of the present invention. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
The present invention is not limited to the specific details of the above embodiments, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the scope of the technical concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (3)
1. The automatic capillary flow matching simulation measuring device is characterized by comprising a controller, a flowmeter, a first pressure sensor, a second pressure sensor, a first temperature sensor, a second temperature sensor and an electronic expansion valve for replacing a capillary, wherein one end of the electronic expansion valve is connected with an external condenser outlet through the flowmeter, the other end of the electronic expansion valve is connected with an external evaporator inlet, the first pressure sensor collects pressure data of medium flowing out of the condenser outlet, the first temperature sensor collects temperature data of medium flowing out of the condenser outlet, the second pressure sensor collects pressure data of medium flowing out of the evaporator outlet, the second temperature sensor collects temperature data of medium flowing out of the evaporator outlet, and the flowmeter, the first pressure sensor, the second pressure sensor, the first temperature sensor and the second temperature sensor are respectively and electrically connected with a controller in a signal transmission mode, and the controller is electrically connected with the electronic expansion valve in a control mode.
2. The machine filter element coding positioning device according to claim 1, wherein the controller is further electrically connected with a key.
3. The machine filter element coding positioning device according to claim 1, wherein the controller is further electrically connected with the screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310373957.XA CN116499534A (en) | 2023-04-10 | 2023-04-10 | Automatic capillary flow matching simulation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310373957.XA CN116499534A (en) | 2023-04-10 | 2023-04-10 | Automatic capillary flow matching simulation measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116499534A true CN116499534A (en) | 2023-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310373957.XA Pending CN116499534A (en) | 2023-04-10 | 2023-04-10 | Automatic capillary flow matching simulation measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116499534A (en) |
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2023
- 2023-04-10 CN CN202310373957.XA patent/CN116499534A/en active Pending
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