Remote switching multi-point pressure measuring device

Abstract

The utility model discloses a remote switchable multi-point pressure measuring device, which relates to the field of air conditioner pressure measurement and comprises an electric cabinet, a pressure quick coupling, a pipe assembly and a pressure sensor, a central processing unit is arranged in the electric cabinet, the pressure sensor is mounted at one end of the pipe assembly, and a main path pressure quick coupling is mounted at the other end of the pipe assembly. A plurality of groups of branch assemblies are connected in series on the pipe assembly, so that a plurality of pressure measurement branches are formed; the pressure measurement branch is electrically connected with an output point of the central processing unit through a cable assembly, and a pressure sensor signal line is electrically connected with an analog quantity point of the central processing unit; a control screen is further fixedly installed on the electric control box, the central processing unit is electrically connected and communicated with the control screen, and therefore a real-time pressure value obtained through calculation of the central processing unit is displayed on the control screen. According to the utility model, the single pressure sensor can measure the pressure at different points by controlling the switch of the electric control valve.

Description

Technical Field

[0001] The utility model relates to the field of air-conditioning pressure measurement, in particular to a multi-point pressure measurement device capable of remotely switching. Background Art

[0002] Refrigerant pressure is a very important factor in the air-conditioning system. It directly affects the working efficiency and refrigeration effect of the air-conditioning system. Excessive pressure will cause the refrigeration compressor to overheat, serious wear, lubricant deterioration and cooling capacity reduction, and increase the energy consumption of the system. Excessive low pressure can easily cause the cooling capacity of the refrigeration system to decrease, and the refrigeration compressor to have difficulty in oil return. Therefore, pressure measurement becomes particularly important during the research and development and testing of air-conditioning equipment. With the diversification of different units, more and more pressure points need to be measured in the air-conditioning system, and compact measuring devices that can measure pressure at multiple points at the same time are becoming more and more popular in refrigeration equipment testing experiments.

[0003] Existing pressure measurement devices often rely on multiple pressure sensors to measure pressure at different points, which have the defects of complex test pipelines and high device costs. In addition, there are measurement errors between different pressure sensors, and the test accuracy is poor, which needs to be improved. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a remotely switchable multi-point pressure measuring device, which enables a single pressure sensor to measure pressures at different points by controlling the switch of an electric control valve.

[0005] The purpose of the utility model is achieved through the following technical solutions: this remotely switchable multi-point pressure measuring device includes an electric control box, a pressure quick connector, a pipe assembly and a pressure sensor, a central processing unit is arranged in the electric control box, the pressure sensor is installed at one end of the pipe assembly, and a main pressure quick connector is installed at the other end of the pipe assembly, thereby forming a pressure measurement main circuit, and a plurality of groups of branch circuit components are also connected in series on the pipe assembly, thereby forming a plurality of pressure measurement branches; the pressure measurement branch is electrically connected to the output point of the central processing unit through a cable assembly, and the pressure sensor signal line is electrically connected to the analog point of the central processing unit; a control panel is also fixedly installed on the electric control box, and the central processing unit is electrically connected to the control panel for communication, so that the real-time pressure value calculated by the central processing unit is displayed on the control panel.

[0006] As a further technical solution, the branch assembly includes an electric control valve, a filter and a branch pressure quick connector which are connected to the pipe assembly in sequence; the branch pressure quick connector is used to install a pressure hose and connect it to the measured point.

[0007] As a further technical solution, the branch pressure quick connectors of each pressure measurement branch are respectively connected to different points to be measured, so that real-time pressure measurement of multiple points can be achieved with a single pressure sensor.

[0008] As a further technical solution, each pressure measurement branch uses an electric control valve to control the connection and disconnection with the pipe assembly.

[0009] As a further technical solution, the pressure measurement branch circuit is connected to the pressure measurement main circuit by a Y-shaped branch pipe.

[0010] As a further technical solution, the cable assembly includes a cable quick connector A and a cable quick connector B, which are plugged into each other, the cable quick connector A is connected to the output point of the central processing unit, and the power cord of the electric control valve is connected to the cable quick connector B.

[0011] As a further technical solution, the central processing unit and the control panel are both powered by a switching power supply arranged in the electric control box, and the switching power supply is connected to an external power supply through a power plug.

[0012] As a further technical solution, the control panel is connected to the central processing unit via an RS485 communication line.

[0013] As a further technical solution, the main line pressure quick connector is used to connect a vacuum pump connector or a refrigerant tank.

[0014] As a further technical solution, the pressure sensor is used to measure the refrigerant pressure inside the device.

[0015] The beneficial effects of the utility model are:

[0016] 1. Use a single pressure sensor to measure the real-time pressure of multiple points, avoiding measurement errors and achieving higher measurement accuracy;

[0017] 2. Using dynamic control valves as valve components eliminates the need to manually switch valves, and can be operated remotely to avoid frequent entry into the test room and causing test interference;

[0018] 3. Use filters to filter system impurities to avoid blockage of the electric control valve and extend the service life of the device;

[0019] 4. Improve the efficiency of vacuuming and refrigerant filling of the unit, and facilitate refrigerant replenishment during unit operation;

[0020] 5. By expanding the number of branches, the number of test points can be increased, greatly increasing the number of test points;

[0021] 6. The main line and the branch line are connected by a Y-shaped branch pipe, which effectively reduces the pressure drop of the branch line. The measuring device is easy to connect, has strong versatility, and is easy to maintain;

[0022] 7. The CPU can be programmed to automatically and periodically record measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Explanation of the reference numerals: electric control box 1, control panel 2, central processing unit 3, switching power supply 4, cable quick connector A5, cable quick connector B6, power plug 7, pressure quick connector 8, pipe assembly 9, filter 10, electric control valve 11, pressure sensor 12. DETAILED DESCRIPTION

[0025] The utility model will be described in detail below with reference to the accompanying drawings:

[0026] Example: As attached Figure 1 As shown, this remotely switchable multi-point pressure measuring device includes an electric control box 1, a control panel 2, a central processing unit 3, a switching power supply 4, a cable quick connector A5, a cable quick connector B6, a power plug 7, a pressure quick connector 8, a pipe assembly 9, a filter 10, an electric control valve 11 and a pressure sensor 12.

[0027] Reference Figure 1 The central processing unit 3 is arranged in the box of the electric control box 1 (a circuit board for installing the central processing unit 3 is arranged synchronously), the pressure sensor 12 is installed at the lower end of the pipe assembly 9, and the main pressure quick connector 8 is installed at the upper end of the pipe assembly 9, thereby forming a pressure measurement main circuit. In addition, several groups of branch circuit components are connected in series on the pipe assembly 9, thereby forming several pressure measurement branches.

[0028] Furthermore, the branch assembly includes an electric control valve 11, a filter 10 and a branch pressure quick connector 8 which are connected to the pipe assembly 9 in sequence. The branch pressure quick connector 8 is used to install a pressure hose and connect it to the measured point. Using a filter to filter system impurities can avoid clogging of the electric control valve and extend the service life of the device. Among them, the electric control valve 11 is electrically connected to the output point of the central processor 3 through a cable assembly, and the signal line of the pressure sensor 12 is electrically connected to the analog point of the central processor 3. A control panel 2 is also fixedly installed on the box cover of the electric control box 1. The central processor 3 is electrically connected to the control panel 2 for communication, so that the real-time pressure value calculated by the central processor 3 is displayed on the control panel 2. Preferably, the branch pressure quick connectors 8 of each pressure measurement branch are respectively connected to different points to be measured, so that the real-time pressure of multiple points can be measured by a single pressure sensor 12. The real-time pressure of multiple points can be measured using a single pressure sensor, which avoids measurement errors and has higher measurement accuracy. In addition, each pressure measurement branch uses an electric control valve 11 to control the on-off connection with the pipe assembly 9. Using a dynamic control valve as a valve component eliminates the need for manual valve switching and can be remotely operated to avoid frequent entry into the test room to cause test interference.

[0029] Preferably, the pressure measurement branch and the pressure measurement main line are connected by a Y-shaped branch pipe, which effectively reduces the pressure drop of the branch pipe, makes the measuring device easy to connect, more versatile, and simple to maintain. By expanding the number of branches, the number of test points can be increased, greatly increasing the number of test points.

[0030] Furthermore, the cable assembly includes a cable quick connector A5 and a cable quick connector B6, which are plugged into each other. At the same time, the cable quick connector A5 is connected to the output point of the central processor 3, and the power line of the electric control valve 11 is connected to the cable quick connector B6.

[0031] The central processor 3 and the control panel 2 are powered by a switch power supply 4 provided in the electric control box 1, and the switch power supply 4 is connected to an external power supply via a power plug 7. The control panel 2 is connected to the central processor 3 via an RS485 communication line. A program can be set on the central processor 3 to automatically and periodically record the measurement data.

[0032] The main pressure quick connector 8 can be used to connect a vacuum pump connector or a refrigerant tank, and the pressure sensor 12 can be used to measure the refrigerant pressure inside the device.

[0033] The working process of the utility model includes four working modes: pressure measurement, unit vacuuming, refrigerant filling and refrigerant supplementation. The specific process is as follows:

[0034] Pressure measurement: The branch pressure quick connector 8 is connected to the point pressure quick connector of the unit to be measured through a refrigerant pressure hose. The branch copper tube pressure is the same as the pressure at the measured point. The control panel 2 issues an opening command for the electric control valve 11, which is processed and calculated by the central processing unit 3 to open the corresponding electric control valve 11. The pressure at the pressure sensor 12 is the same as the pressure at the measured point. The pressure sensor 12 transmits an electrical signal to the central processing unit 3. The electrical signal of the pressure sensor 12 is converted into a real-time pressure value after calculation by the central processing unit 3 and displayed on the control panel 2. The purpose of the filter 10 is to filter impurities in the pipeline system. The purpose of the power plug 7 is to provide power to the switching power supply 4. The purpose of the switching power supply 4 is to provide power to the control panel 2 and the central processing unit 3. The purpose of the cable quick connector A5 and the quick cable connector B6 is to quickly connect the electric control valve 11 to the central processing unit 3.

[0035] Vacuuming the unit: The main pressure quick connector 8 is connected to the vacuum pump connector, and the branch pressure quick connector 8 is connected to the measured point quick connector through the refrigerant pressure hose. All electric control valves 11 are opened, and the vacuum pump can vacuum the measured points at the same time to improve the vacuuming efficiency of the unit.

[0036] Filling refrigerant: The main pressure quick connector 8 is connected to the refrigerant tank through a refrigerant pressure hose, and the branch pressure quick connector 8 is connected to the measured point quick connector through a refrigerant pressure hose. Opening all the electric control valves 11 and the refrigerant tank valves can simultaneously fill the measured points with refrigerant, thereby improving the refrigerant filling efficiency.

[0037] Refilling refrigerant: The main pressure quick connector 8 is connected to the refrigerant tank through a refrigerant pressure hose, and the branch pressure quick connector 8 is connected to the measured point quick connector of the unit through a refrigerant pressure hose. Opening the corresponding electric control valve 11 and the refrigerant tank valve can replenish refrigerant to the running unit.

[0038] The utility model uses a single pressure sensor for measurement, which not only ensures the consistency of the sensor, reduces the error between different sensors, and greatly reduces the number of pressure sensors used in the test process. The use of a control panel for remote control can avoid frequent entry into the test room and reduce test interference. When the unit is vacuuming and filling refrigerant, opening all the electric control valves can improve the efficiency of vacuuming and refrigerant filling. When the unit is running, opening the corresponding electric control valve can replenish the refrigerant of the unit, which can effectively shorten the process time, reduce labor costs, and improve production efficiency.

[0039] It is understandable that, for those skilled in the art, any equivalent replacement or change to the technical solution and the concept of the utility model should fall within the protection scope of the claims attached to the utility model.

Claims

1. A remotely switchable multi-point pressure measuring device, characterized in that: The invention comprises an electric control box (1), a pressure quick connector (8), a pipe assembly (9) and a pressure sensor (12); a central processing unit (3) is arranged in the electric control box (1); the pressure sensor (12) is installed at one end of the pipe assembly (9); a main pressure quick connector (8) is installed at the other end of the pipe assembly (9), thereby forming a pressure measurement main circuit; a plurality of branch circuit assemblies are also connected in series on the pipe assembly (9), thereby forming a plurality of pressure measurement branches; the pressure measurement branches are electrically connected to the output point of the central processing unit (3) through a cable assembly, and a signal line of the pressure sensor (12) is electrically connected to an analog point of the central processing unit (3); a control panel (2) is also fixedly installed on the electric control box (1); the central processing unit (3) and the control panel (2) are electrically connected and communicated, thereby displaying a real-time pressure value calculated by the central processing unit (3) on the control panel (2).

2. The remotely switchable multi-point pressure measuring device according to claim 1 is characterized in that: The branch assembly comprises an electric control valve (11), a filter (10) and a branch pressure quick connector (8) which are sequentially connected to the pipe assembly (9); the branch pressure quick connector (8) is used to install a pressure hose and connect it to a measured point.

3. The remotely switchable multi-point pressure measuring device according to claim 2 is characterized in that: The branch pressure quick connectors (8) of each pressure measurement branch are respectively connected to different points to be measured, so that the real-time pressure of multiple points can be measured by means of a single pressure sensor (12).

4. The remotely switchable multi-point pressure measuring device according to claim 2 is characterized in that: Each pressure measurement branch uses an electric control valve (11) to control the connection and disconnection with the pipe assembly (9).

5. The remotely switchable multi-point pressure measuring device according to claim 1 is characterized in that: The pressure measurement branch circuit is connected to the pressure measurement main circuit by a Y-shaped branch pipe.

6. The remotely switchable multi-point pressure measuring device according to claim 2 is characterized in that: The cable assembly comprises a cable quick connector A (5) and a cable quick connector B (6), which are plugged into each other, the cable quick connector A (5) is connected to the output point of the central processing unit (3), and the power line of the electric control valve (11) is connected to the cable quick connector B (6).

7. The remotely switchable multi-point pressure measuring device according to claim 1 is characterized in that: The central processing unit (3) and the control panel (2) are both powered by a switching power supply (4) arranged in the electric control box (1), and the switching power supply (4) is connected to an external power supply via a power plug (7).

8. The remotely switchable multi-point pressure measuring device according to claim 1 is characterized in that: The control panel (2) is connected to the central processing unit (3) via an RS485 communication line.

9. The remotely switchable multi-point pressure measuring device according to claim 1, characterized in that: The main line pressure quick connector (8) is used to connect to a vacuum pump connector or a refrigerant tank.

10. The remotely switchable multi-point pressure measuring device according to claim 1, characterized in that: The pressure sensor (12) is used to measure the refrigerant pressure inside the device.

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