CN212902172U - Accurate control device for temperature of large-scale refrigeration house - Google Patents
Accurate control device for temperature of large-scale refrigeration house Download PDFInfo
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- CN212902172U CN212902172U CN202023330902.1U CN202023330902U CN212902172U CN 212902172 U CN212902172 U CN 212902172U CN 202023330902 U CN202023330902 U CN 202023330902U CN 212902172 U CN212902172 U CN 212902172U
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Abstract
The utility model belongs to the field of refrigeration house temperature control, in particular to an accurate control device for the temperature of a large refrigeration house, which comprises an air conditioner air cabinet and a refrigeration house connected with the air conditioner air cabinet, wherein an air inlet device is arranged at the air inlet of the air conditioner air cabinet, the air inlet device comprises a return air pipe arranged at the air inlet of the air conditioner air cabinet, and an air valve and an air inlet temperature sensor are respectively arranged at the joint of the return air pipe and the air conditioner air cabinet; the air conditioner air cabinet is connected with the refrigeration house, the cold-heat exchange device of the air conditioner air cabinet receives the secondary refrigerant, the secondary refrigerant is refrigerated through the cold-heat exchange device, the air conditioner air cabinet adopts constant air pressure control and refrigeration house air circulation refrigeration, in the aspect of temperature control, temperature sampling is carried out through a temperature sensor in a PLC-based control cabinet matched refrigeration house, PID control is carried out on the opening size of a proportional-integral valve installed on a secondary refrigerant pipeline, the proportional-integral valve is slowly opened when the temperature rises, the temperature is slowly closed when the temperature falls, the temperature can be continuously close to a target value, and the accuracy of refrigeration house temperature control is improved.
Description
Technical Field
The utility model relates to a freezer control by temperature change field, concretely relates to accurate control device of large-scale freezer temperature.
Background
The freezer is one kind of refrigeration plant. The cold storage is a constant temperature and humidity storage device which creates an environment with different outdoor temperature or humidity by manual means and is used for food, liquid, chemical engineering, medicine, vaccines, scientific experiments and other articles. The cold store is usually located near the port of transportation or the place of origin. Compared with the refrigerator, the refrigeration house has larger refrigeration area and a common refrigeration principle.
The prior art has the following problems:
most of the existing refrigeration houses set a temperature return difference value through comparison between the temperature and a target temperature, and control the on-off of the refrigeration of an evaporator in a mode of switching a liquid supply electromagnetic valve.
In order to solve the problems, the application provides an accurate control device for the temperature of a large-scale refrigeration house.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
For solving the technical problem who exists among the background art, the utility model provides an accurate control device of large-scale freezer temperature has the characteristics that improve temperature control's precision.
(II) technical scheme
In order to solve the technical problem, the utility model provides an accurate control device for the temperature of a large-scale cold storage, which comprises an air conditioner air cabinet and a cold storage connected with the air conditioner air cabinet, wherein an air inlet device is arranged at the air inlet of the air conditioner air cabinet, the air inlet device comprises a return air pipe arranged at the air inlet of the air conditioner air cabinet, and an air valve and an air inlet temperature sensor are respectively arranged at the joint of the return air pipe and the air conditioner air cabinet;
an air outlet of the air conditioner air cabinet is provided with an air valve air outlet device, the air valve air outlet device comprises an air outlet pipe arranged on the air outlet of the air conditioner air cabinet, and an air pressure sensor is arranged on the air outlet pipe;
the air conditioner air cabinet is characterized in that a heat and cold exchange device and a centrifugal fan are sequentially arranged in the air conditioner air cabinet along an air transmission direction, a proportional integral valve is connected to the heat and cold exchange device through a pipeline, and the proportional integral valve and the centrifugal fan are connected to a control cabinet through communication cables.
Preferably, the liquid inlet end of the proportional-integral valve is connected to an external secondary refrigerant storage tank, and a constant-pressure secondary refrigerant is transmitted in a pipeline connected between the cold heat exchange device and the proportional-integral valve.
Preferably, the end face of the output end of the centrifugal fan, which is close to the air outlet, is provided with a diffusion port.
Preferably, the air inlet and the air outlet of the air conditioner air cabinet are respectively connected to the refrigeration house through the air return pipe and the air outlet pipe.
Preferably, the inside of freezer is provided with a plurality of temperature sensor, temperature sensor passes through the communication cable and is connected to the switch board.
Preferably, the outer wall of one end of the air return pipe penetrating into the refrigeration house is provided with an air return tuyere.
Preferably, the wind pressure sensor is installed on the wind outlet pipe and is connected with the control cabinet through a communication cable.
The above technical scheme of the utility model has following profitable technological effect: after the air conditioner air cabinet and the refrigeration house are connected, the cold-heat exchange device of the air conditioner air cabinet receives the secondary refrigerant, the secondary refrigerant is refrigerated through the cold-heat exchange device, the air conditioner air cabinet adopts constant air pressure control and refrigeration house air circulation refrigeration, in the aspect of temperature control, temperature sampling is carried out through a temperature sensor in a PLC-based control cabinet matched refrigeration house, PID control is carried out on the opening size of a proportional-integral valve installed on a secondary refrigerant pipeline, the proportional-integral valve is slowly opened when the temperature rises, the proportional-integral valve is slowly closed when the temperature falls, the temperature can be continuously close to a target value, and the accuracy of refrigeration house temperature control is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is the schematic diagram of the installation work of the refrigeration storage of the utility model.
Reference numerals:
1. an air-conditioning cabinet; 2. an air intake device; 21. an air valve; 22. a return air duct; 23. an air return air inlet; 24. an inlet air temperature sensor; 3. an air outlet device; 31. a wind pressure sensor; 32. an air outlet pipe; 4. a heat exchange device; 5. a proportional integral valve; 6. a centrifugal fan; 61. a diffusion port; 7. a control cabinet; 8. a cold storage; 9. a temperature sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-2, the utility model provides an accurate control device for temperature of large-scale cold storage, including cold storage 8 connected with air-conditioning air cabinet 1, the air inlet of air-conditioning air cabinet 1 is provided with air intake device 2, air intake device 2 includes return air pipe 22 installed at the air inlet of air-conditioning air cabinet 1, and the junction of return air pipe 22 and air-conditioning air cabinet 1 is respectively provided with air valve 21 and air intake temperature sensor 24;
an air valve air outlet device 3 is arranged at an air outlet of the air-conditioning cabinet 1, the air valve air outlet device 3 comprises an air outlet pipe 32 arranged on the air outlet of the air-conditioning cabinet 1, and an air pressure sensor 31 is arranged on the air outlet pipe 32;
the inside of air conditioner wind cabinet 1 has set gradually cold and heat exchange device 4 and centrifugal fan 6 along wind direction of transfer, and pipe connection has proportional-integral valve 5 on the cold and heat exchange device 4, and proportional-integral valve 5 and centrifugal fan 6 all are connected to switch board 7 through the communication cable.
It should be noted that: the air inlet and the air outlet of the air-conditioning cabinet 1 are respectively connected to the refrigeration house 8 through a return air pipe 22 and an air outlet pipe 32; the air conditioner air cabinet 1 is connected with the refrigeration house 8 through the air inlet device 2 and the air outlet device 3, and the air supply through the air conditioner air cabinet 1 provides proper cold air for the refrigeration house 8.
The heat exchanging device 4 can be, for example, an evaporator or a refrigeration coil, and can be selected according to actual needs.
In order to provide secondary refrigerant for the cold-heat exchange device 4 conveniently, the liquid inlet end of the proportional integral valve 5 is connected to an external secondary refrigerant storage tank, and constant-pressure secondary refrigerant is transmitted in a pipeline connected between the cold-heat exchange device 4 and the proportional integral valve 5; the coolant of the heat exchanger 4 is supplied from an external coolant tank connected to a proportional-integral valve 5, and the coolant supply amount is controlled by the proportional-integral valve 5.
In order to collect cold air in the refrigeration house 8 conveniently, a return air inlet 23 is further formed in the outer wall of one end, penetrating into the refrigeration house 8, of the return air pipe 22; the return air inlet 23 is used for assisting in collecting residual cooling air in the refrigeration house 8.
In order to facilitate the wind pressure when the wind outlet pipe 32 is used for discharging wind, the wind pressure sensor 31 arranged on the wind outlet pipe 32 is connected with the control cabinet 7 through a communication cable.
In an optional embodiment, a diffusion port 61 is formed in the end face of the output end of the centrifugal fan 6, which is close to the air outlet; when the centrifugal fan 6 works, the cold air cooled by the heat exchange device 4 is transmitted to the air outlet device 3 at the air outlet through the diffusion opening 61.
In an alternative embodiment, a plurality of temperature sensors 9 are arranged inside the refrigeration house 8, and the temperature sensors 9 are connected to the control cabinet 7 through communication cables; the temperature sensor 9 is installed at multiple points in the refrigeration house 8 to monitor the temperature of the refrigeration house 8 comprehensively.
In this embodiment, after the air conditioner air cabinet 1 and the freezer 8 are connected, the cold-heat exchange device 4 of the air conditioner air cabinet 1 receives the secondary refrigerant, the secondary refrigerant is cooled through the cold-heat exchange device 4, the air conditioner air cabinet 1 adopts constant air pressure control and freezer 8 air circulation refrigeration, in the aspect of temperature control, the control cabinet 7 based on PLC cooperates with the temperature sensor 9 in the freezer 8 to sample the temperature, PID control is carried out to the size of opening of the proportional-integral valve 5 installed on the secondary refrigerant pipeline, the proportional-integral valve 5 is slowly opened when the temperature rises, slowly closed when the temperature falls, the temperature can be constantly close to the target value, and the accuracy of freezer temperature control is improved.
The utility model discloses a theory of operation and use flow: after the unit is built, the air conditioner air cabinet 1 is connected with the refrigeration house 8
Step one, carrying out constant-pressure circulation debugging on a secondary refrigerant;
step two, debugging a cold-heat exchange device 4 for refrigerating the secondary refrigerant;
step three, carrying out constant air pressure debugging on the air conditioner air cabinet 1;
step four, carrying out initial debugging on the temperature, and opening the proportional integral valve 5 to the maximum position to enable the secondary refrigerant to pass through the air-conditioning air cabinet 1 in the maximum amount when the temperature of the storage is far higher than the target temperature, so that the temperature is rapidly reduced;
step five, when the temperature is close to the target temperature, the PLC control cabinet 7 feeds back the temperature of the refrigeration house 8 to the proportional-integral valve 5 to carry out PID control on the opening of the proportional-integral valve 5, so that the temperature is continuously close to the target temperature;
and step six, continuously observing and recording temperature change, observing curve graph change, and modifying PID parameters of the proportional integral valve 5 to further reduce the temperature fluctuation range.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. The accurate control device for the temperature of the large-scale refrigeration house is characterized by comprising an air conditioner air cabinet (1) and a refrigeration house (8) connected with the air conditioner air cabinet (1), wherein an air inlet device (2) is arranged at an air inlet of the air conditioner air cabinet (1), the air inlet device (2) comprises an air return pipe (22) installed at the air inlet of the air conditioner air cabinet (1), and an air valve (21) and an air inlet temperature sensor (24) are respectively installed at the joint of the air return pipe (22) and the air conditioner air cabinet (1);
an air valve air outlet device (3) is arranged at an air outlet of the air-conditioning air cabinet (1), the air valve air outlet device (3) comprises an air outlet pipe (32) arranged on the air outlet of the air-conditioning air cabinet (1), and a wind pressure sensor (31) is arranged on the air outlet pipe (32);
the air conditioner air cabinet is characterized in that a cold-heat exchange device (4) and a centrifugal fan (6) are sequentially arranged in the air conditioner air cabinet (1) along the air transmission direction, a proportional-integral valve (5) is connected to the cold-heat exchange device (4) through a pipeline, and the proportional-integral valve (5) and the centrifugal fan (6) are connected to a control cabinet (7) through communication cables.
2. The accurate temperature control device for the large-scale refrigeration storage according to claim 1, characterized in that the liquid inlet end of the proportional-integral valve (5) is connected to an external secondary refrigerant storage tank, and a constant ballast refrigerant is transmitted in a pipeline connected between the cold heat exchange device (4) and the proportional-integral valve (5).
3. The accurate temperature control device for the large-scale refrigeration storage according to claim 1, wherein the end surface of the output end of the centrifugal fan (6) close to the air outlet is provided with a diffusion opening (61).
4. The accurate temperature control device for large-scale cold storage according to claim 1, characterized in that the air inlet and outlet of the air-conditioning cabinet (1) are respectively connected to the cold storage (8) through the air return pipe (22) and the air outlet pipe (32).
5. An accurate control device for the temperature of a large-scale cold storage according to claim 1, characterized in that a plurality of temperature sensors (9) are arranged inside the cold storage (8), and the temperature sensors (9) are connected to the control cabinet (7) through communication cables.
6. The accurate temperature control device for the large-scale cold storage according to claim 1, wherein the outer wall of one end of the return air pipe (22) penetrating into the cold storage (8) is provided with a return air inlet (23).
7. The accurate temperature control device for large-scale cold storage according to claim 1, wherein the wind pressure sensor (31) installed on the wind outlet pipe (32) is connected with the control cabinet (7) through a communication cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023330902.1U CN212902172U (en) | 2020-12-30 | 2020-12-30 | Accurate control device for temperature of large-scale refrigeration house |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023330902.1U CN212902172U (en) | 2020-12-30 | 2020-12-30 | Accurate control device for temperature of large-scale refrigeration house |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212902172U true CN212902172U (en) | 2021-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023330902.1U Active CN212902172U (en) | 2020-12-30 | 2020-12-30 | Accurate control device for temperature of large-scale refrigeration house |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212902172U (en) |
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2020
- 2020-12-30 CN CN202023330902.1U patent/CN212902172U/en active Active
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