Current signal generator and water chilling unit energy level display test simulation device

Abstract

The utility model discloses a current signal generator and a water chilling unit energy level display test simulation device, the current signal generator comprises a main controller, a touch screen connected with the main controller, and an analog quantity output module connected with the main controller, the main controller and the analog quantity output module are packaged in a housing, and the housing is provided with a power supply. The touch screen is arranged on the surface of the shell, and the main controller is provided with an RS-485 communication port. The water chilling unit energy level display test simulation device comprises a unit controller, an electromagnetic valve assembly connected with and controlled by the unit controller, an analog quantity acquisition module connected with the unit controller, and a current signal generator connected with the analog quantity acquisition module. The utility model provides a portable current signal generator tool which is matched with a unit controller and an electromagnetic valve assembly to improve a unit energy level display test scheme and improve test efficiency.

Description

Technical Field

[0001] The utility model relates to the field of chillers, in particular to a current signal generator and a chiller energy level display test simulation device. Background Art

[0002] At present, chiller manufacturers generally use compressors with stepless adjustment. The energy level of the chiller is generally reflected by testing the ratio between the unit's operating current and the rated current through a current transformer to achieve energy level display. However, when the energy level display test is performed before the equipment leaves the factory, in order to reduce costs, the unit program simulation is generally performed without starting the compressor. At this time, the compressor is not running, and no current passes, so the stepless energy level display cannot be performed. The solenoid valve control action that needs to be used in conjunction with the stepless energy level display in the system will also be affected. In addition, the existing current and voltage signal generators cannot simulate the current changes when the chiller is running or require manual coordination simulation, which is inefficient and has poor results. Utility Model Content

[0003] Purpose of the utility model: In view of the problems existing in the prior art, the utility model provides a current signal generator for generating analog current.

[0004] The utility model also provides a chiller energy level display test simulation device, which includes the current signal generator and is used to intelligently synchronize the chiller control logic in the simulation stage before the energy level test to improve the energy level test efficiency.

[0005] Technical solution: A current signal generator includes a main controller, a touch screen connected to the main controller, and an analog output module connected to the main controller. The main controller and the analog output module are encapsulated in a shell, the touch screen is arranged on the surface of the shell, and the main controller is provided with an RS-485 communication port.

[0006] The main controller adopts Siemens S7-200-SMART series SR60 module, and the analog output module adopts Siemens EM-AQ04 module.

[0007] A chiller energy level display test simulation device comprises a unit controller, a solenoid valve assembly connected to and controlled by the unit controller, an analog quantity acquisition module connected to the unit controller, an analog quantity output module connected to the analog quantity acquisition module, a main controller connected to the analog quantity output module, and a touch screen connected to the main controller. The main controller is connected to the unit controller via respective RS-485 ports, and the main controller outputs analog current signals corresponding to each energy level to the analog quantity acquisition module via the analog quantity output module, and displays the corresponding energy level on the touch screen.

[0008] The solenoid valve assembly includes an SV0 solenoid valve corresponding to the loading state, an SV1 solenoid valve corresponding to the first energy level, and an SV3 solenoid valve corresponding to the second energy level. Each solenoid valve is started and closed in sequence under the control of the unit controller.

[0009] Furthermore, the device also includes a unit touch screen, and the unit touch screen is connected to the unit controller.

[0010] Wherein, the main controller and the unit controller adopt Siemens S7-200-SMART series SR60 module.

[0011] The analog output module adopts Siemens EM-AQ04 module; the analog acquisition module adopts COSI SAM-24ENLE module.

[0012] Beneficial effects: (1) The utility model provides a current signal generator, including a main controller, a touch screen connected to the main controller, and an analog output module connected to the main controller. The main controller and the analog output module are encapsulated in a shell, and the touch screen is arranged on the surface of the shell to form a portable tooling, so as to flexibly perform docking tests on different units. (2) The main controller of the current signal generator is provided with an RS-485 communication port. As long as it is connected to the unit controller through an RS-485 connection line and the communication parameters are set through the touch screen, the test can be started, which is convenient to use. (3) The chiller energy level display test simulation device provided by the utility model outputs an analog current signal to the unit through the current signal generator. It can realize the intelligent synchronous chiller control logic without starting the compressor, complete the stepless adjustment energy level test, and greatly improve the efficiency of the energy level display test at a very low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the current signal generator of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of the energy level display test simulation device of the chiller of the utility model;

[0015] Figure 3 This is a schematic diagram of the coordination between the current signal generator and the unit. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0017] Reference Figure 1 and Figure 3The utility model provides a current signal generator, including a main controller, a touch screen connected to the main controller, and an analog output module connected to the main controller. The main controller and the analog output module are encapsulated in a shell, the touch screen is arranged on the surface of the shell, and the main controller is provided with an RS-485 communication port, which is connected to the controller of the unit to be tested through an RS-485 connecting line.

[0018] The main controller uses a programmable logic device PLC, and the specific model in the embodiment is a Siemens S7-200-SMART series SR60 module. The main controller gives a corresponding analog current signal based on an external signal, which is converted into an analog current output through an analog output module. The analog output module in the embodiment uses a Siemens EM-AQ04 module.

[0019] Reference Figure 2 and Figure 3 The utility model provides a chiller energy level display test simulation device, comprising: a main controller, a touch screen connected to the main controller, an analog output module connected to the main controller, an analog acquisition module connected to the analog output module, a unit controller connected to the analog acquisition module, and a solenoid valve assembly connected to the unit controller. The main controller, the touch screen, and the analog output module are the above-mentioned current signal generators, and the unit controller is also provided with an RS-485 port. The main controller and the unit controller are connected through their respective RS-485 ports. The touch screen provides a human-machine interface for setting communication parameters and other parameters, and is used to display the corresponding energy level.

[0020] The solenoid valve assembly includes an SV0 solenoid valve corresponding to the loading state, an SV1 solenoid valve corresponding to the first energy level, and an SV3 solenoid valve corresponding to the second energy level. Each solenoid valve is started and closed in sequence under the control of the unit controller. The opening and closing of the solenoid valve assembly defines the unit energy level state. For example, the SV1 solenoid valve corresponds to the 25% energy level stage of the unit, and the SV3 solenoid valve corresponds to the 50% energy level stage of the unit. After running at the 50% energy level for a period of time, the unit enters stepless regulation. At this stage, the SV3 solenoid valve and the SV0 solenoid valve are opened or closed according to the control of the unit controller.

[0021] In the embodiment of the utility model, the unit controller adopts a programmable logic device PLC, and the specific model is a Siemens S7-200-SMART series SR60 module. The unit controller sends the unit operation status to the main controller through the RS-485 connection line. The main controller gives the analog current value in the corresponding state according to the unit operation status, and gives the analog current signal through the analog output module. After the analog current signal is converted by the analog acquisition module, it is transmitted to the unit controller in a form that the unit controller can process. The control logic of the unit controller and the main controller can be implemented according to the communication interface and digital signal processing function of a general digital signal processor. For example, the unit controller can represent the operation status with a simple digital code, and the main controller of the current signal generator can give the corresponding analog current value according to the digital code. The specific setting method is not the focus of this application and will not be repeated here.

[0022] The analog output module is connected to the main controller, and outputs the analog current signal to the analog acquisition module according to the analog current value given by the main controller. The analog acquisition module converts the incoming analog current signal and transmits it to the unit controller. In the embodiment, the analog output module adopts Siemens' EM-AQ04 module, and the analog acquisition module adopts Koss' SAM-24ENLE module. In combination with the SR60 module, this solution can be realized.

[0023] The current signal generator provided by the utility model encapsulates the main controller and the analog output module in a shell, and the touch screen is set on the surface of the shell, forming a portable tool, which can flexibly perform docking tests on different units. As long as it is connected to the unit controller through the RS-485 connection line and the communication parameters are set through the touch screen, the test can be started, which is convenient to use.

[0024] The purpose of the utility model is to provide a hardware configuration different from the prior art, which is a combined chiller energy level display test simulation device that integrates multiple modules. It simulates different operating states and energy level displays of the unit through changes in the current analog quantity and the opening and closing of the solenoid valve assembly, automatically generates corresponding analog currents, and realizes intelligent synchronous chiller control logic, so as to perform energy level display tests without starting the compressor. The signal conversion, transmission and control involved can be realized by using the control logic of the corresponding module in the prior art. The utility model has the characteristics of simple structure and easy use, and can effectively assist manufacturers in improving the efficiency of unit energy level display tests.

Claims

1. A current signal generator, characterized in that: It includes a main controller, a touch screen connected to the main controller, and an analog output module connected to the main controller. The main controller and the analog output module are encapsulated in a shell, the touch screen is arranged on the surface of the shell, and the main controller is provided with an RS-485 communication port.

2. The current signal generator according to claim 1, characterized in that: The main controller adopts Siemens S7-200-SMART series SR60 module, and the analog output module adopts Siemens EM-AQ04 module.

3. A chiller energy level display test simulation device, characterized in that: It includes a unit controller, a solenoid valve assembly connected to and controlled by the unit controller, an analog quantity acquisition module connected to the unit controller, an analog quantity output module connected to the analog quantity acquisition module, a main controller connected to the analog quantity output module, and a touch screen connected to the main controller. The main controller and the unit controller are connected through their respective RS-485 ports. The main controller outputs analog current signals corresponding to each energy level to the analog quantity acquisition module through the analog quantity output module, and displays the corresponding energy level on the touch screen.

4. The device according to claim 3, characterized in that The solenoid valve assembly includes an SV0 solenoid valve corresponding to the loading state, an SV1 solenoid valve corresponding to the first energy level, and an SV3 solenoid valve corresponding to the second energy level. Each solenoid valve is started and closed in sequence under the control of the unit controller.

5. The device according to claim 3, characterized in that It also includes a unit touch screen, which is connected to the unit controller.

6. The device according to claim 3, characterized in that The main controller and the unit controller adopt Siemens S7-200-SMART series SR60 modules.

7. The device according to claim 3, characterized in that The analog output module adopts Siemens EM-AQ04 module; the analog acquisition module adopts Coss SAM-24ENLE module.

8. A chiller energy level display test simulation device, characterized in that: It includes a unit controller, a solenoid valve assembly connected to and controlled by the unit controller, an analog quantity acquisition module connected to the unit controller, and a current signal generator connected to the analog quantity acquisition module. The main controller is connected to the unit controller through their respective RS-485 ports. The current signal generator is According to the current signal generator according to claim 1 or 2, the main controller of the current signal generator outputs the analog current signal corresponding to each energy level to the analog acquisition module through the analog output module, and displays the corresponding energy level on the touch screen.

Images