Temperature and pressure control system for dairy product filling workshop

Abstract

The utility model belongs to the technical field of air conditioners, and particularly discloses a dairy product filling workshop temperature and pressure control system which comprises a temperature adjusting subsystem and a pressure adjusting subsystem. The temperature adjusting subsystem comprises a cooling fan temperature balance control box and a workshop temperature sensor; the temperature balance control box is electrically connected with the cooling fan through the first frequency converter; the signal output end of the workshop temperature sensor is connected with the temperature signal input end of the temperature balance control box; the pressure adjusting subsystem comprises a constant-pressure fan, a positive-pressure balance control box and a differential pressure sensor; the positive pressure balance control box is electrically connected with the constant pressure fan through the second frequency converter; the signal output end of the differential pressure sensor is connected with the differential pressure signal input end of the positive pressure balance control box. The temperature and pressure of the filling workshop can be regulated and controlled in real time, current impact on a power grid is avoided, and electric energy is saved. The device is suitable for adjusting the temperature and the pressure of the filling workshop.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning equipment and relates to a temperature and pressure control system in a dairy product filling workshop. Background Art

[0002] like Figure 1 As shown in the figure, it is the air conditioning system currently used in the dairy product filling workshop. The system includes an air conditioning fan, and the air outlet of the air conditioning fan is set in the filling workshop to deliver cold air to the filling workshop to ensure that the positive pressure in the filling workshop is maintained above 10ba. In this system, the air conditioning fan is powered by the power distribution cabinet, and the power distribution cabinet realizes the start and stop of the air conditioning fan voltage drop through the built-in step-down transformer. Specifically, when the air conditioning fan is started, the step-down transformer inside the power distribution cabinet is turned on, and after 3 seconds, the contactor replaces the step-down transformer to supply 380V voltage to the air conditioning fan, which can reduce the voltage impact on the power grid when the motor of the air conditioning fan is started to a certain extent.

[0003] However, after adopting the above system, during the start-up of the air-conditioning fan, due to the lack of voltage reduction, there will still be a current impact on the power grid that exceeds 1.2 to 1.5 times the operating current. In addition, the above system cannot adjust the air-conditioning fan according to the actual situation of the filling workshop, which will also cause energy waste. Summary of the invention

[0004] The purpose of the utility model is to provide a temperature and pressure control system for a dairy product filling workshop, so as to adjust the temperature and pressure of the filling workshop in real time, prevent the current impact of the power grid caused by the start-up of the fan, and save electric energy.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A temperature and pressure control system for a dairy product filling workshop, comprising a temperature regulating subsystem and a pressure regulating subsystem;

[0007] The temperature adjustment subsystem includes a cooling fan, a first frequency converter, a temperature balance control box, and a workshop temperature sensor; the control signal output end of the temperature balance control box is connected to the motor control signal input end of the cooling fan through the first frequency converter; the workshop temperature sensor is arranged in the workshop, and the signal output end of the workshop temperature sensor is connected to the temperature signal input end of the temperature balance control box;

[0008] The pressure regulating subsystem includes a constant pressure fan, a second frequency converter, a positive pressure balance control box, and a pressure difference sensor. The pressure difference sensor includes a first sensing head arranged in the filling workshop and a second sensing head arranged outside the filling workshop. The control signal output end of the positive pressure balance control box is connected to the motor control signal input end of the constant pressure fan through the second frequency converter. The signal output end of the pressure difference sensor is connected to the pressure difference signal input end of the positive pressure balance control box.

[0009] The air outlet and return air outlet of the cooling fan and constant pressure fan are connected to the filling workshop.

[0010] As a limitation, the temperature adjustment subsystem also includes a return air temperature sensor disposed at the return air outlet of the cooling fan, and a signal output end of the return air temperature sensor is connected to a return air temperature signal input end of the temperature balance control box.

[0011] As a second limitation, the control signal output terminal of the positive pressure balance control box is also connected to the motor control signal input terminal of the cooling fan through a second frequency converter.

[0012] As a third limitation, the number of workshop temperature sensors is at least two, at least one workshop temperature sensor is arranged in the personnel activity area of ​​the filling workshop and is 1.7 meters above the ground; at least one workshop temperature sensor is arranged in the equipment area of ​​the filling workshop.

[0013] As a fourth limitation, the air outlet of the cooling fan and the air outlet of the constant pressure fan are connected to the filling workshop through the same air inlet main duct; the return air outlet of the cooling fan and the return air outlet of the constant pressure fan are connected to the filling workshop through the same return air main duct.

[0014] As the utility model adopts the above technical solution, compared with the prior art, the technical progress achieved is:

[0015] (1) The utility model installs a workshop temperature sensor and a pressure difference sensor in the filling workshop, which can provide real-time feedback on the temperature in the workshop and the pressure difference between the inside and outside of the workshop, and provide corresponding feedback to the temperature balance control box and the positive pressure balance control box. The two further control the cooling fan and the constant pressure fan through the frequency converter, so that the temperature and pressure of the filling workshop can be adjusted in real time; not only does it eliminate the problem of insufficient pressure difference between the inside and outside of the filling workshop, but it also eliminates the current shock to the power grid caused by the fan starting, and can also save electricity;

[0016] (2) The utility model further provides a return air temperature sensor at the return air outlet of the cooling fan, and feeds back the temperature detection result thereto to the temperature balance control box, which can improve the accuracy of temperature control in the filling workshop;

[0017] (3) The control signal output terminal of the positive pressure balance control box in the utility model is also connected to the motor control signal input terminal of the cooling fan through the second frequency converter. The operation of the cooling fan is regulated in combination with the pressure detection result in the filling workshop, so as to achieve a reasonable match between the temperature and pressure in the filling workshop;

[0018] (4) The number of workshop temperature sensors in the utility model is at least two. Workshop temperature sensors are respectively set in the personnel activity area and the equipment area in the filling workshop, so that the temperature of different areas of the workshop can be collected for comprehensive judgment, thereby improving the accuracy of temperature control in the filling workshop;

[0019] (5) Since the air vents of the air conditioning in the filling workshop need to be installed with high-quality filtration, and a set of air ducts will basically occupy 1 / 2 of the workshop ceiling space, if a cooling air duct and a constant pressure air duct are set on the workshop ceiling at the same time, it cannot be implemented due to limited space. Therefore, in the present invention, the air outlet of the cooling fan and the air outlet of the constant pressure fan are connected to the filling workshop through the same air inlet main duct, and the return air outlet of the cooling fan and the return air outlet of the constant pressure fan are connected to the filling workshop through the same return air main duct. This can meet the use requirements and save the installation cost of air conditioning.

[0020] The utility model belongs to the technical field of air conditioning equipment, can adjust the temperature and pressure of a filling workshop in real time, and prevent the current impact of the power grid caused by the start-up of the fan, thereby saving electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0022] In the attached picture:

[0023] Figure 1 This is a schematic diagram of the structure of the air conditioning system used in the dairy product filling workshop in the prior art of the utility model;

[0024] Figure 2 It is a structural principle diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] Example: Temperature and pressure control system for dairy product filling workshop

[0027] This embodiment includes a temperature regulating subsystem and a pressure regulating subsystem.

[0028] like Figure 2 As shown, the temperature regulation subsystem includes a cooling fan, a first frequency converter, a temperature balance control box, and a workshop temperature sensor; the control signal output end of the temperature balance control box is connected to the motor control signal input end of the cooling fan through the first frequency converter; the workshop temperature sensor is arranged in the workshop, and the signal output end of the workshop temperature sensor is connected to the temperature signal input end of the temperature balance control box. Furthermore, in this embodiment, the temperature regulation subsystem also includes a return air temperature sensor arranged at the return air outlet of the cooling fan, and the signal output end of the return air temperature sensor is connected to the return air temperature signal input end of the temperature balance control box.

[0029] The pressure regulation subsystem includes a constant pressure fan, a second frequency converter, a positive pressure balance control box, and a pressure differential sensor. The pressure differential sensor includes a first sensing head arranged in the filling workshop and a second sensing head arranged outside the filling workshop; the control signal output end of the positive pressure balance control box is connected to the motor control signal input end of the constant pressure fan through the second frequency converter; the signal output end of the pressure differential sensor is connected to the pressure differential signal input end of the positive pressure balance control box.

[0030] The air outlet and return air outlet of the cooling fan and constant pressure fan are connected to the filling workshop.

[0031] In order to achieve a reasonable match between pressure and temperature, in this embodiment, the control signal output terminal of the positive pressure balance control box is also connected to the motor control signal input terminal of the cooling fan through a second frequency converter.

[0032] Furthermore, there are two workshop temperature sensors, one of which is arranged in the personnel activity area of ​​the filling workshop and is 1.7 meters from the ground; and the other is arranged in the equipment area of ​​the filling workshop.

[0033] In actual use, the number of workshop temperature sensors can be changed as needed, and the installation positions can be reasonably set to comprehensively reflect the temperature in the filling workshop so as to make adjustments more accurately. At the same time, the distance between the workshop temperature sensor and the ground in the personnel activity area can be changed according to actual needs. This embodiment only takes 1.7 meters as an example, which is determined based on the average height of people in this area.

[0034] Furthermore, in order to save the installation cost of air conditioners while meeting the usage requirements, in this embodiment, the outlet of the cooling fan and the outlet of the constant pressure fan are connected to the filling workshop through the same air inlet main duct, and the return air outlet of the cooling fan and the return air outlet of the constant pressure fan are connected to the filling workshop through the same return air main duct. Figure 2As shown, the cooling fan and the constant pressure fan are respectively provided with corresponding air outlet ducts, but the two air outlet ducts are connected to the same air inlet main duct before entering the workshop. The cooling fan and the constant pressure fan are respectively provided with corresponding return air ducts, and the two return air ducts are connected to the same return air main duct outside the workshop.

[0035] In this embodiment, the temperature balance control box is provided with a first programmable PLC circuit, and the positive pressure balance control box is provided with a second programmable PLC circuit. The first programmable PLC circuit is pre-set with a temperature threshold through programming, and the second programmable PLC circuit is pre-set with a pressure difference threshold through programming.

[0036] In this embodiment, different workshop temperature sensors are installed in the filling workshop to detect and collect the on-site temperature of the filling workshop, and a return air temperature sensor is added to the return air outlet of the cooling fan. The first programmable PLC circuit takes the average value of the temperature feedback from the return air temperature sensor and different workshop temperature sensors as the workshop temperature value, and compares the workshop temperature value with the internal temperature threshold. When the workshop temperature value is higher than the internal temperature threshold, the temperature balance control box sends a start signal to the first inverter, and the cooling fan runs at a high frequency to reduce the workshop temperature. When the workshop temperature value is lower than the internal temperature threshold, the first inverter runs at a low frequency, so that the workshop temperature is controlled by the output frequency of the first inverter.

[0037] In this embodiment, different frequencies of the second frequency converter control the constant pressure fan to run at different speeds. When the pressure difference at the workshop site is insufficient, the speed increases and the fan rotation speed speeds up, so as to achieve the purpose of controlling the different pressure differences at the filling workshop site. A pressure difference sensor is installed in the filling workshop to detect and collect the pressure difference between the filling workshop site and the external pressure. When the filling workshop temperature value is lower than the internal temperature threshold, when the pressure difference at the filling workshop is less than 10ba, the positive pressure balance control box outputs the second frequency converter start signal, and the constant pressure fan runs at high frequency to ensure the pressure difference at the workshop site. When it exceeds 10ba, the set frequency can be reduced, and the constant pressure fan runs at low speed. At the same time, variable frequency start can eliminate the current impact on the power grid when the equipment starts.

[0038] Furthermore, the control signal output end of the positive pressure balance control box is also connected to the motor control signal input end of the cooling fan through the second frequency converter. By programming and setting parameters of the second programmable PLC circuit, the operation of the cooling fan can be regulated in combination with the pressure detection results in the filling workshop, thereby achieving a reasonable match between the temperature and pressure in the filling workshop and achieving matching operation of the temperature signal and the pressure difference signal input and output.

Claims

1. A temperature and pressure control system for a dairy product filling workshop, characterized in that: It includes a temperature regulating subsystem and a pressure regulating subsystem; The temperature adjustment subsystem includes a cooling fan, a first frequency converter, a temperature balance control box, and a workshop temperature sensor; the control signal output end of the temperature balance control box is connected to the motor control signal input end of the cooling fan through the first frequency converter; the workshop temperature sensor is arranged in the workshop, and the signal output end of the workshop temperature sensor is connected to the temperature signal input end of the temperature balance control box; The pressure regulating subsystem includes a constant pressure fan, a second frequency converter, a positive pressure balance control box, and a pressure difference sensor. The pressure difference sensor includes a first sensing head arranged in the filling workshop and a second sensing head arranged outside the filling workshop. The control signal output end of the positive pressure balance control box is connected to the motor control signal input end of the constant pressure fan through the second frequency converter. The signal output end of the pressure difference sensor is connected to the pressure difference signal input end of the positive pressure balance control box. The air outlet and return air outlet of the cooling fan and constant pressure fan are connected to the filling workshop.

2. The temperature and pressure control system for a dairy product filling workshop according to claim 1, characterized in that: The temperature regulating subsystem also includes a return air temperature sensor arranged at the return air outlet of the cooling fan, and the signal output end of the return air temperature sensor is connected to the return air temperature signal input end of the temperature balance control box.

3. The temperature and pressure control system for a dairy product filling workshop according to claim 1 or 2, characterized in that: The control signal output terminal of the positive pressure balance control box is also connected to the motor control signal input terminal of the cooling fan through the second frequency converter.

4. The temperature and pressure control system for a dairy product filling workshop according to claim 1 or 2, characterized in that: The number of workshop temperature sensors is at least two, at least one workshop temperature sensor is arranged in the personnel activity area of ​​the filling workshop and is 1.7 meters away from the ground; at least one workshop temperature sensor is arranged in the equipment area of ​​the filling workshop.

5. The temperature and pressure control system for a dairy product filling workshop according to claim 1 or 2, characterized in that: The air outlet of the cooling fan and the air outlet of the constant pressure fan are connected to the filling workshop through the same air inlet main duct; the return air outlet of the cooling fan and the return air outlet of the constant pressure fan are connected to the filling workshop through the same return air main duct.

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