Refrigeration house unit control system

Abstract

The utility model provides a refrigeration house unit control system which comprises a refrigeration house unit controller, pressure transmitters with the preset number larger than or equal to 3 and a conversion circuit, and the refrigeration house unit controller and the pressure transmitters are connected through the conversion circuit. The pressure transmitter is used for detecting the real-time pressure of the refrigeration house unit and outputting an electric signal, and the conversion circuit is used for converting the electric signal into a voltage signal. And the cold storage unit controller calculates a real-time pressure value acquired by the pressure transmitter according to the voltage signal, and controls the cold storage unit according to the real-time pressure value. That is to say, the operation state of the cold storage unit can be reflected in real time by utilizing the electric signals collected and output by the pressure transmitter, then real-time control is performed according to the operation state of the cold storage unit, direct turn-off protection on the cold storage unit is avoided, and the service life of the cold storage unit is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to cold store unit refrigeration field especially relates to a cold store unit control system. BACKGROUND

[0002] With the development of society, current can utilize cold store unit refrigeration. Cold store unit includes cold store evaporative fan, condensing fan, compressor and cold store unit controller. Cold store unit controller can control cold store evaporative fan, condensing fan and compressor, thereby realizing the refrigeration temperature control to cold store. When cold store unit controller is normal, needs to gather the protection signal of cold store unit whole system, executes the protection action according to protection signal, to guarantee that cold store evaporative fan, condensing fan and compressor of cold store unit will not be damaged.

[0003] Current high and low voltage controller and oil pressure difference controller gather the protection signal of cold store unit whole system, but high and low voltage controller and oil pressure difference controller are digital switch interface, when cold store unit controller detects protection signal, can only be off cold store unit, cannot adjust cold store unit according to the current operating state of cold store unit. UTILITY MODEL CONTENTS

[0004] Therefore, the purpose of the present application is to provide a cold store unit control system that can obtain the operating state of the cold store unit in real time and control the cold store unit in real time according to the operating state.

[0005] The present application provides a cold store unit control system, which comprises a cold store unit controller, a conversion circuit and a preset number of pressure transmitters, wherein the preset number is greater than or equal to 3.

[0006] The cold store unit controller and the pressure transmitters are connected by the conversion circuit.

[0007] The pressure transmitters are used to detect the real-time pressure of the cold store unit and output an electric signal.

[0008] The conversion circuit is used to convert the electric signal into a voltage signal.

[0009] The cold store unit controller calculates the real-time pressure value collected by the pressure transmitters according to the voltage signal and controls the cold store unit according to the real-time pressure value.

[0010] Optionally, the preset number matches the number of compressors included in the cold store unit.

[0011] Optionally, the preset number is the same as the number of compressors included in the cold store unit.

[0012] Optionally, the pressure transmitter respectively collects high pressure, low pressure and oil pressure of the cold storage unit.

[0013] Optionally, the electrical signal is a current signal.

[0014] The conversion circuit is configured to convert the current signal into a voltage signal.

[0015] Optionally, the conversion circuit comprises a first capacitor, a second capacitor, a first resistor and a second resistor.

[0016] The first end of the first capacitor is connected to the pressure transmitter, the second end of the first capacitor is connected to the first resistor, the first end of the first resistor is respectively connected to the first capacitor and the ground, the second end of the first resistor is connected to the first end of the second resistor, the first end of the second resistor is connected to the pressure transmitter, the second end of the second resistor is respectively connected to the cold storage unit controller and the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0017] Optionally, the electrical signal is a voltage signal.

[0018] The conversion circuit is configured to directly output the voltage signal.

[0019] Optionally, the number of conversion circuits is a preset number.

[0020] Optionally, when the difference between the real-time pressure value and the pressure threshold value is less than the target threshold value, the cold storage unit controller adjusts the pressure of the cold storage unit to increase the difference between the real-time pressure of the cold storage unit and the pressure threshold value.

[0021] Optionally, the pressure threshold value comprises a high pressure threshold value, a low pressure threshold value and an oil pressure difference threshold value; and the real-time pressure value comprises a high pressure value, a low pressure value and an oil pressure value.

[0022] When the high pressure value is less than the high pressure threshold value and the difference between the high pressure value and the high pressure threshold value is less than the target threshold value, the cold storage unit controller reduces the exhaust pressure of the cold storage unit to increase the difference between the high pressure of the cold storage unit and the high pressure threshold value.

[0023] When the low pressure value is greater than the low pressure threshold value and the difference between the low pressure value and the low pressure threshold value is less than the target threshold value, the cold storage unit controller increases the suction pressure of the cold storage unit to increase the difference between the low pressure of the cold storage unit and the low pressure threshold value.

[0024] When the oil pressure difference between the oil pressure pressure value and the low pressure pressure value is less than the oil pressure difference threshold value and the difference between the oil pressure difference threshold value and the oil pressure difference is less than the target threshold value, the cold storage unit controller increases the oil pressure difference of the cold storage unit to increase the difference between the oil pressure difference of the cold storage unit and the oil pressure difference threshold value.

[0025] The application provides a cold storage unit control system, which comprises a cold storage unit controller, a conversion circuit and a preset number of pressure transmitters, the preset number being greater than or equal to 3, and the cold storage unit controller and the pressure transmitters are connected through the conversion circuit. The pressure transmitters are used to detect real-time pressure of the cold storage unit and output electric signals, and the conversion circuit is used to convert the electric signals into voltage signals. The cold storage unit controller calculates the real-time pressure value collected by the pressure transmitters according to the voltage signals and controls the cold storage unit according to the real-time pressure value. That is, the electric signals output by the pressure transmitters can reflect the running state of the cold storage unit in real time, and the cold storage unit is controlled in real time according to the running state of the cold storage unit, so that the shutdown protection of the cold storage unit is avoided, the number of shutdowns of the cold storage unit is reduced, and the service life of the cold storage unit is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0027] Figure 1 Fig. 1 shows a structure schematic diagram of a cold storage unit control system provided by an embodiment of the application;

[0028] Figure 2 Fig. 2 shows a circuit schematic diagram of a conversion circuit provided by an embodiment of the application;

[0029] Figure 3 Fig. 3 shows a circuit schematic diagram of another conversion circuit provided by an embodiment of the application. DETAILED DESCRIPTION

[0030] In order to make the personnel in the technical field better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely in the following with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the application.

[0031] Many specific details are set forth in the following description in order to provide a thorough understanding of the present application. However, the present application can be practiced according to other embodiments that can not be described in detail herein, and the present application is not limited to the embodiments described herein. It will be understood that the present application can be practiced with modification and alteration, and that the present application is not limited to the above described embodiments.

[0032] The present application is described in detail below with reference to the accompanying drawings. To facilitate an easy understanding of the present application, the cross-sectional view of the device structure is partially enlarged without following the general proportion, and the schematic view is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0033] With the development of society, the current can be used to refrigeration unit. The cold storage unit includes cold storage evaporative fan, condensing fan, compressor and cold storage unit controller. The cold storage unit controller can control the cold storage evaporative fan, condensing fan and compressor, so as to realize the control of the refrigeration temperature of the cold storage, and the working principle of the cold storage unit controller is to detect the difference between the temperature of the cold storage temperature sensor and the set temperature, so as to realize the control of the evaporative fan, condensing fan and compressor, so as to realize the reduction or increase of the temperature of the cold storage to the set temperature. When the cold storage unit controller works normally, the protection signal of the whole system of the cold storage unit needs to be collected, and the protection action is executed according to the protection signal, so as to ensure that the cold storage evaporative fan, condensing fan and compressor of the cold storage unit will not be damaged.

[0034] The current high and low pressure controller and oil pressure difference controller are used to collect the protection signal of the whole system of the cold storage unit. When the high pressure controller detects that the high pressure of the condensing side of the whole system of the cold storage unit is greater than the set value, the oil pressure difference controller detects that the oil pressure difference of the condensing side of the whole system is greater than the set value, or the low pressure controller detects that the low pressure of the suction side of the whole system of the cold storage unit is less than the set value, the high and low pressure controller or the oil pressure difference controller will output the disconnect signal, that is, the protection signal is transmitted to the cold storage unit controller, and the compressor is stopped by the cold storage unit controller for protection.

[0035] However, the high and low pressure controller and the oil pressure difference controller are digital switch interface, which only outputs the protection signal when the pressure is too large or too small. When the cold storage unit controller detects the above protection signal, only the cold storage unit can be stopped, and the cold storage unit cannot be adjusted according to the current running state of the cold storage unit, that is, other protection measures of the cold storage unit cannot be realized, and the service life of the cold storage unit, especially the compressor, cannot be prolonged.

[0036] In addition, the current cannot obtain the values of high pressure, low pressure and oil pressure of the whole system of the cold storage unit in real time. Only after the cold storage unit is stopped, the running state of the current unit can be known, and the cold storage unit cannot be judged and maintained in advance.

[0037] That is, when using the high-low pressure controller and the oil pressure difference controller to detect protection, the precise control and adjustment of the cold storage unit cannot be realized, and only simple unit protection functions can be realized.

[0038] Therefore, the embodiment of the present application provides a cold storage unit control system. The system comprises a cold storage unit controller, a preset number of pressure transmitters and a conversion circuit. The cold storage unit controller and the pressure transmitters are connected by the conversion circuit. The pressure transmitter is used to detect the real-time pressure of the cold storage unit and output an electric signal. The conversion circuit is used to convert the electric signal into a voltage signal. The cold storage unit controller calculates the real-time pressure value collected by the pressure transmitter according to the voltage signal, and controls the cold storage unit according to the real-time pressure value. That is, the electric signal output by the pressure transmitter can reflect the running state of the cold storage unit in real time, and then the running state of the cold storage unit is controlled in real time, so that the shutdown protection of the cold storage unit is avoided, thereby prolonging the service life of the cold storage unit.

[0039] In order to better understand the technical solutions and technical effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0040] Referring to Figure 1 , the figure is a structural schematic diagram of a cold storage unit control system provided by the embodiment of the present application.

[0041] The cold storage unit control system 100 provided by the embodiment comprises a cold storage unit controller 110, a preset number of pressure transmitters 120 and a conversion circuit 130. The preset number is greater than or equal to 3.

[0042] In the embodiment of the present application, the cold storage unit controller 110 is used to control the entire system of the cold storage unit, that is, the cold storage unit controller 110 can control the cold storage evaporative fan, the condensing fan and the compressor. The cold storage unit controller 110 and the pressure transmitter 120 are connected by the conversion circuit 130.

[0043] The pressure transmitter 120 can detect the real-time pressure of the cold storage unit and output an electric signal, that is, the pressure transmitter 120 can obtain the pressure of the cold storage unit in real time, that is, the running state of the cold storage unit can be obtained in real time, and the running state is transmitted to the conversion circuit 130 in the form of an electric signal.

[0044] The conversion circuit 130 can receive the electric signal transmitted by the pressure transmitter 120, convert the electric signal into a voltage signal, so that the cold storage unit controller 110 receives the voltage signal subsequently.

[0045] The cold storage unit controller 110 can receive the voltage signal output by the conversion circuit 130, calculate the real-time pressure value collected by the pressure transmitter 120 according to the voltage signal, and then directly control the cold storage unit in real time according to the real-time pressure value.

[0046] That is, the running state of the cold storage unit can be reflected in real time by collecting the output electrical signal of the pressure transmitter 120, and then the cold storage unit is controlled in real time according to the running state of the cold storage unit, avoiding direct shutdown protection of the cold storage unit, reducing the number of cold storage unit shutdowns, and thereby prolonging the service life of the cold storage unit.

[0047] In the embodiment of the present application, considering the need to obtain the running state of the cold storage unit in all directions, the preset number of pressure transmitters 120 is matched with the number of compressors included in the cold storage unit, so that the real-time pressure of each compressor is obtained by using the preset number of pressure transmitters 120 matched with the number of compressors.

[0048] As a possible implementation, the preset number of pressure transmitters 120 matched with the number of compressors included in the cold storage unit can be that the preset number of pressure transmitters 120 is the same as the number of compressors included in the cold storage unit. For example, the number of compressors included in the cold storage unit is 3, and the preset number can be 3, that is, one pressure transmitter 120 collects the electrical signal corresponding to one compressor. By setting the minimum number of pressure transmitters 120 to 3, three pressure transmitters 120 can be used to collect high pressure, low pressure and oil pressure of the cold storage unit.

[0049] As another possible implementation, the preset number of pressure transmitters 120 matched with the number of compressors included in the cold storage unit can be that the preset number of pressure transmitters 120 is a multiple of the number of compressors included in the cold storage unit. For example, the number of compressors included in the cold storage unit is 3, and the preset number can be 5, that is, two pressure transmitters 120 collect system high pressure and low pressure, and the remaining pressure transmitters 120 collect the oil pressure corresponding to the compressor.

[0050] Considering that the number of pressure transmitters is the preset number, in order to convert the electrical signal output by each pressure transmitter 120 into a voltage signal, the number of conversion circuits 130 is also the preset number, so that one pressure transmitter 120 corresponds to one conversion circuit 130.

[0051] In the embodiment of the present application, the electrical signal can be a current type analog signal or a voltage type analog signal, that is, the electrical signal can be a current signal or a voltage signal.

[0052] When the electrical signal is a voltage signal, the conversion circuit 130 can directly output the voltage signal, or the conversion circuit 130 can change the amplitude of the voltage signal to output a voltage signal that better meets the voltage range corresponding to the cold storage unit controller, so as to facilitate the subsequent acquisition of voltage signals by the cold storage unit controller.

[0053] When the electrical signal is a current signal, the conversion circuit 130 can convert the current signal into a voltage signal.

[0054] Specifically, the conversion circuit 130 that converts a current signal to a voltage signal may include a first capacitor 131, a second capacitor 132, a first resistor 133, and a second resistor 134, as shown in the reference. Figure 2 As shown. The first terminal of the first capacitor 131 is connected to the pressure transmitter 120, and the second terminal of the first capacitor 131 is connected to the first resistor 133. The first terminal of the first resistor 133 is connected to both the first capacitor 131 and ground. The second terminal of the first resistor 133 is connected to the first terminal of the second resistor 134. The first terminal of the second resistor 134 is connected to the pressure transmitter 120, and the second terminal of the second resistor 134 is connected to both the cold storage unit controller 110 and the first terminal of the second capacitor 132. The second terminal of the second capacitor 132 is grounded.

[0055] As an example, when the preset number of pressure transmitters 120 is 3, the number of conversion circuits 130 is also 3, see reference. Figure 3 As shown. Terminals 1, 2, and 3 of the conversion circuit 130 are respectively connected to the current signals corresponding to the three pressure transmitters 120. The conversion circuit 130 converts the three current signals into voltage signals, and inputs the voltage signals to the microcontroller included in the cold storage unit controller 110 through terminals 5, 6, and 7 respectively for AD sampling and calculation of the real-time pressure value corresponding to each pressure transmitter 120.

[0056] In real-time applications, the pressure transmitter 120 can also be powered to ensure its normal operation. Specifically, this can be achieved using... Figure 3 Terminal 4 shown provides power to the pressure transmitter 120.

[0057] In the embodiments of this application, the cold storage unit controller 110 can control the cold storage unit according to the real-time pressure value. When the difference between the obtained real-time pressure value and the pressure threshold is less than the target threshold, it means that there is a pressure risk in the cold storage unit. The cold storage unit controller 110 can adjust the pressure of the cold storage unit to increase the difference between the real-time pressure of the cold storage unit and the pressure threshold, thereby reducing the pressure risk of the cold storage unit and avoiding compressor shutdown caused by excessively high or low pressure.

[0058] The pressure transmitter 120 can collect high pressure, low pressure and oil pressure of the cold storage unit respectively, that is, real-time pressure values including high pressure, low pressure and oil pressure, so as to determine the real-time running state of the cold storage unit according to the high pressure, low pressure and oil pressure. The cold storage unit is controlled in real time according to the high pressure, low pressure and oil pressure.

[0059] Specifically, the pressure threshold value also includes a high pressure threshold value, a low pressure threshold value and an oil pressure difference threshold value, wherein the oil pressure difference refers to the difference between the oil pressure and the low pressure. When the high pressure is less than the high pressure threshold value and the difference between the high pressure and the high pressure threshold value is less than the target threshold value, it means that the high pressure of the cold storage unit may soon exceed the high pressure threshold value, at which time the cold storage unit controller 110 can reduce the exhaust pressure of the cold storage unit to reduce the high pressure, so as to increase the difference between the high pressure of the cold storage unit and the high pressure threshold value, thereby realizing maintenance of the cold storage unit in advance according to the running state of the cold storage unit.

[0060] When the low pressure is greater than the low pressure threshold value and the difference between the low pressure and the low pressure threshold value is less than the target threshold value, it means that the low pressure of the cold storage unit may soon be lower than the low pressure threshold value, and the cold storage unit controller 110 can increase the suction pressure of the cold storage unit to increase the low pressure, so as to increase the difference between the low pressure of the cold storage unit and the low pressure threshold value, thereby realizing maintenance of the cold storage unit in advance according to the running state of the cold storage unit.

[0061] When the oil pressure difference between the oil pressure and the low pressure is less than the oil pressure difference threshold value and the difference between the oil pressure difference and the oil pressure difference threshold value is less than the target threshold value, it means that the oil pressure difference of the cold storage unit may soon be lower than the oil pressure difference threshold value, and the cold storage unit controller 110 can increase the oil pressure difference of the cold storage unit to increase the difference between the oil pressure difference of the cold storage unit and the oil pressure difference threshold value, thereby realizing maintenance of the cold storage unit in advance according to the running state of the cold storage unit.

[0062] That is, the embodiment of the present application can judge the running state of the cold storage unit through the real-time pressure value, so as to maintain the cold storage unit in advance according to the judgment result.

[0063] As can be seen, the cold storage unit control system provided by the embodiment of the present application can control the cold storage unit by using the analog pressure transmitter, and can obtain the running state of the current cold storage unit in real time. The cold storage unit can use the pressure transmitter to specify a more matched pressure control logic, thereby improving the service life of the compressor.

[0064] The system embodiments described above are only illustrative, wherein the units and modules described as separate components can or can not be physically separated. In addition, part or all of the units and modules can be selected according to actual needs to achieve the purposes of the embodiments. Those skilled in the art can understand and implement without creative labor.

[0065] The above is only the preferred embodiment of the present application, although the preferred embodiment of the present application has been disclosed as above, however, not to limit the present application. Any skilled person in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed methods and technical contents, or modify as equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical scheme of the present application, still belongs to the scope of protection of the technical scheme of the present application.

Claims

1. A cold store unit control system, characterized in that, The system comprises a cold storage unit controller, a conversion circuit and a preset number of pressure transmitters, the preset number being greater than or equal to 3; The cold storage unit controller and the pressure transmitters are connected by the conversion circuit; The pressure transmitters are used to detect the real-time pressure of the cold storage unit and output an electric signal; The conversion circuit is used to convert the electric signal into a voltage signal; The cold storage unit controller calculates the real-time pressure value collected by the pressure transmitters according to the voltage signal, and controls the cold storage unit according to the real-time pressure value.

2. The system of claim 1, wherein, The preset number matches the number of compressors included in the cold storage unit.

3. The system of claim 2, wherein, The preset number is the same as the number of compressors included in the cold storage unit.

4. The system of claim 1, wherein, The pressure transmitters respectively collect the high pressure, low pressure and oil pressure of the cold storage unit.

5. The system of claim 1, wherein, The electric signal is a current signal; The conversion circuit is used to convert the current signal into a voltage signal.

6. The system of claim 5, wherein, The conversion circuit comprises a first capacitor, a second capacitor, a first resistor and a second resistor; The first end of the first capacitor is connected to the pressure transmitter, the second end of the first capacitor is connected to the first resistor, the first end of the first resistor is respectively connected to the first capacitor and the ground, the second end of the first resistor is connected to the first end of the second resistor, the first end of the second resistor is connected to the pressure transmitter, the second end of the second resistor is respectively connected to the cold storage unit controller and the first end of the second capacitor, and the second end of the second capacitor is grounded.

7. The system of claim 1, wherein, The electric signal is a voltage signal; The conversion circuit is used to directly output the voltage signal.

8. The system of any of claims 1-7, wherein, The number of conversion circuits is the preset number.

9. The system of any of claims 1-7, wherein, When the difference between the real-time pressure value and the pressure threshold value is less than the target threshold value, the cold storage unit controller adjusts the pressure of the cold storage unit to increase the difference between the real-time pressure of the cold storage unit and the pressure threshold value.

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