CN216204188U - Refrigerant cooling device for double-loop central air-conditioning frequency conversion electric cabinet - Google Patents
Refrigerant cooling device for double-loop central air-conditioning frequency conversion electric cabinet Download PDFInfo
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- CN216204188U CN216204188U CN202122355376.2U CN202122355376U CN216204188U CN 216204188 U CN216204188 U CN 216204188U CN 202122355376 U CN202122355376 U CN 202122355376U CN 216204188 U CN216204188 U CN 216204188U
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Abstract
The utility model discloses a refrigerant cooling device for a double-loop central air-conditioning variable-frequency electric cabinet, which is characterized in that two heat exchange loops are arranged in the cabinet: the first heat exchange loop comprises a first electronic expansion valve and a plate heat exchanger, the inlet end of the first electronic expansion valve is communicated with the right outlet of the plate heat exchanger, and the outlet end of the first electronic expansion valve is a refrigerant outlet; the second heat exchange loop comprises a second expansion valve and a fan coil, the inlet end of the second expansion valve is communicated with the left inlet of the plate heat exchanger, the outlet end of the second expansion valve is communicated with the upper side pipe inlet of the fan coil, and the lower part of the fan coil is provided with a refrigerant outlet; temperature sensors are respectively arranged in the plate heat exchanger, in the cabinet body and outside the cabinet body, and each temperature sensor is in signal connection with the controller. The temperature control is more accurate, the temperature control is stable, the cooling effect is good, and the high temperature is not easy to occur; the refrigerant throttling evaporation that can avoid flowing into the heating panel increases the condensation risk too fast.
Description
Technical Field
The utility model belongs to the technical field of refrigeration and heat exchange, and particularly relates to a central air-conditioning cooling technology.
Background
With economic development, energy efficiency and environmental protection, central air conditioners tend to be frequency-variable and frequency-variable cabinets are applied more and more in order to save energy, reduce emission and pursue energy efficiency ratio. The frequency conversion cabinet has more power elements, the calorific value is larger and generally accounts for 3% of the power of the electric cabinet, so the cooling problem of the frequency conversion cabinet needs to be concerned in the use process of the frequency conversion cabinet, the frequency converter with the power of 350KW uses air cooling as a down converter, the frequency converter with the power of more than 350KW uses water cooling, the air cooling electric cabinet has large size, the device derating is larger, and the cost is higher; the water cooling device has high requirement on-site water quality, and the heat exchange efficiency is not high, so that the high-temperature alarm of the frequency converter is easily caused when water is cut off suddenly.
The cooling scheme of the existing inverter cabinet mainly comprises the following steps as shown in fig. 1: the device comprises a plate heat exchanger, a temperature sensor, an electromagnetic valve, a controller and a fan; the existing refrigerant cooling scheme has the following problems:
when the temperature of the refrigerant is low and the temperature in the cabinet is high, condensate water can be generated on the surface of the radiator, and for the phenomenon, manufacturers can use heat preservation cotton to preserve heat of the radiator, but when the heat preservation cotton is aged or the condensate water is generated, the condensate water can not be completely condensed.
If the frequency conversion cabinet is internally provided with the alternating current reactor, the heat of the reactor cannot be taken away by the heat dissipation scheme, the environment temperature in the cabinet is high, and the device is aged quickly.
The pressure loss of the electromagnetic valve is large, the flow of a refrigerant is influenced, and under the working condition of a small flow, the heat dissipation of the electric cabinet is insufficient and the temperature is easy to rise.
The electromagnetic valve only has two states of opening and closing, the temperature control is unstable due to frequent action, and the electromagnetic valve needs to be replaced at regular time.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that the refrigerant cooling device for the double-loop central air-conditioning variable-frequency electric cabinet is provided aiming at the defects, the temperature control is more accurate, the temperature control is stable, the cooling effect is good, and the high temperature is not easy to occur; the refrigerant throttling evaporation that can avoid flowing into the heating panel increases the condensation risk too fast.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a refrigerant cooling device for two return circuit central air conditioning frequency conversion electricity cabinets which characterized in that sets up two heat transfer circuit in the cabinet:
the first heat exchange loop comprises a first electronic expansion valve and a plate heat exchanger, the inlet end of the first electronic expansion valve is communicated with the right outlet of the plate heat exchanger, and the outlet end of the first electronic expansion valve is a refrigerant outlet;
the second heat exchange loop comprises a second expansion valve and a fan coil, the inlet end of the second expansion valve is communicated with the left inlet of the plate heat exchanger, the outlet end of the second expansion valve is communicated with the upper side pipe inlet of the fan coil, and the lower part of the fan coil is provided with a refrigerant outlet;
temperature sensors are respectively arranged in the plate heat exchanger, in the cabinet body and outside the cabinet body, and each temperature sensor is in signal connection with the controller.
Among the above-mentioned technical scheme, the well upper portion position installation plate heat exchanger of central air conditioning frequency conversion electric cabinet's casing backplate, plate heat exchanger left side mouth of pipe intercommunication refrigerant import, right side mouth of pipe intercommunication refrigerant export.
Among the above-mentioned technical scheme, fan coil is located plate heat exchanger below, and fan coil upside portion mouth of pipe intercommunication refrigerant import, lower part mouth of pipe intercommunication refrigerant export.
Among the above-mentioned technical scheme, the water collector is installed under fan coil, and water collector bottom intercommunication outlet conduit stretches out the cabinet and regards as the comdenstion water export.
Among the above-mentioned technical scheme, the fan is installed on fan coil, and the wind direction upwards sets up.
Among the above-mentioned technical scheme, radiator temperature sensor installs the position in the middle of plate heat exchanger.
Among the above-mentioned technical scheme, the external environment temperature sensor of cabinet installs on the roof of casing and stretches out the cabinet and set up outward.
Among the above-mentioned technical scheme, the top at plate heat exchanger is installed to the interior ambient temperature sensor of cabinet.
In the above technical scheme, the controller is communicated with the first electronic expansion valve, the second electronic expansion valve, the fan, the in-cabinet environment temperature sensor, the out-cabinet environment temperature sensor and the radiator temperature sensor through control lines.
Therefore, the device divides heat exchange into a first heat exchange loop and a second heat exchange loop, separately controls heat dissipation of the power device and heat dissipation of the environment in the cabinet, has good cooling effect and is not easy to have high temperature; the first heat exchange loop electromagnetic expansion valve is designed at the outlet end of the heat exchanger, so that the phenomenon that the condensation risk is increased due to the fact that the refrigerant flowing into the heat dissipation plate is throttled and evaporated too fast can be avoided.
The second heat exchange loop electromagnetic expansion valve is designed at the inlet end of the fan coil, so that the refrigerant flowing into the coil can be ensured to be evaporated under the condition of smaller valve opening, and the cooling effect of the refrigerant is improved. The heat exchange efficiency of the two loops is high.
The device is designed to collect three temperatures, namely, the temperature inside the cabinet, the temperature outside the cabinet and the heat exchanger, so that the temperature control is more accurate and stable; the device is provided with the electronic expansion valve, so that the pressure drop of the refrigerant is small, the stepless opening regulation of the refrigerant flow is realized, the stepless opening regulation control is stable, and the service life is longer and more accurate;
the fan coil is designed in the device, and the constant ambient temperature in the cabinet can be kept under the condition of no heat exchange with air outside the cabinet by refrigerant evaporation heat exchange;
the device is provided with the fan coil condensate water receiving disc, when a refrigerant in an air coil pipeline is evaporated, moist air in the cabinet is condensed and then flows to the surfaces of the fins of the air coil, and the fan coil condensate water is received by the water receiving disc and is discharged outside the cabinet, so that potential safety hazards are avoided;
finally, the central air conditioning unit has natural advantages, has the advantages that the refrigerant can be used for cooling the frequency converter in a refrigerant cooling mode, the cooling effect is good, and external water resources are not used.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic view of a conventional water cooling apparatus.
FIG. 2 is a schematic structural diagram of a refrigerant cooling device for a variable frequency electric cabinet of a dual-loop central air conditioner according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
As shown in fig. 2, the refrigerant cooling device for a variable frequency electric cabinet of a central air conditioner according to the embodiment of the utility model comprises a heat exchanger electronic expansion valve 1, a copper pipe 2, a fan coil electronic expansion valve 3, an in-cabinet environment temperature sensor 4, an out-cabinet environment temperature sensor 5, a plate heat exchanger 6, a radiator temperature sensor 7, a fan coil 8, a fan 9, a condensation water pan 10, a shell 11 and a controller 12; other devices are not part of the housing and are used for illustrating the scheme: this patent is described in further detail below with reference to the accompanying drawings:
referring to fig. 2, a plate heat exchanger 6 is installed at the middle upper position of a shell 11 of a frequency conversion electric cabinet of a central air conditioner, a pipe orifice at the left side of the plate heat exchanger 6 is communicated with a refrigerant inlet 13 through a copper pipe 2, and a pipe orifice at the right side is communicated with a refrigerant outlet 14 through the copper pipe 2.
The fan coil 8 is arranged at the lower part of the shell 11 and is positioned below the plate type heat exchanger 6, the upper side pipe inlet of the fan coil 8 is communicated with the refrigerant inlet 13 through the copper pipe 2, and the lower pipe inlet is communicated with the refrigerant outlet 14 through the copper pipe 2.
The radiator temperature sensor 7 is arranged in the middle of the plate heat exchanger 6; the external cabinet environment temperature sensor 5 is mounted on the top plate of the housing 11 and extends out of the cabinet.
The heat exchanger electronic expansion valve 1 is arranged on the copper pipe 2, and the inlet of the heat exchanger electronic expansion valve 1 is connected with the right pipe orifice of the copper pipe 2 reaching the plate heat exchanger 6. The outlet end of the electronic expansion valve 1 of the heat exchanger is a refrigerant outlet.
And the fan coil electronic expansion valve 3 is arranged on the copper pipe 2, and the outlet end of the fan coil electronic expansion valve 3 reaches the upper side inlet of the fan coil 8 through the copper pipe 2. The inlet end of the fan coil electronic expansion valve 3 is communicated with the left inlet of the plate heat exchanger 6. The lower part of the fan coil 8 is provided with a refrigerant outlet
The in-cabinet ambient temperature sensor 4 is mounted approximately 20mm above the plate heat exchanger 6.
The fan 9 is mounted on the fan coil 8 with the wind direction up.
And a condensation water pan 10 is arranged under the fan coil 8, and the bottom of the water pan is communicated with a water outlet pipeline and extends out of the cabinet to be used as a condensation water outlet 15.
The controller 12 is communicated with the heat exchanger electronic expansion valve 1, the fan coil electronic expansion valve 3, the fan 9, the in-cabinet environment temperature sensor 4, the out-cabinet environment temperature sensor 5 and the radiator temperature sensor 7 through control lines.
The non-illustrated parts referred to in this patent are the same as or implemented using prior art.
The utility model relates to a refrigerant cooling device for a frequency conversion electric cabinet of a central air conditioner, which has the following working principle:
the refrigerant cooling double-loop heat exchange system is characterized in that a refrigerant loop is divided into a first heat exchange loop and a second heat exchange loop.
The first heat exchange loop comprises a heat exchanger electronic expansion valve and a plate type heat exchanger 6; the first heat exchange loop is a power device cooling loop, and the loss of a power device in the electric cabinet is subjected to heat exchange with a refrigerant in the copper pipe 2 after passing through the heat exchanger electronic expansion valve 1 through the plate heat exchanger 6, so that the power device of the electric cabinet in operation is cooled.
And the second heat exchange loop comprises a fan coil electronic expansion valve 3 and a fan coil 8, the second heat exchange loop is an in-cabinet environment temperature cooling loop, and the air in the electric cabinet is subjected to heat exchange with a refrigerant in the copper pipe 2 after passing through the fan coil 8 and the fan coil electronic expansion valve 3, so that the environment temperature in the electric cabinet in operation is cooled.
After the system is powered on, the electronic expansion valve 1 of the heat exchanger in the first heat exchange loop is fully opened to cool the refrigerant and send the refrigerant into the plate heat exchanger 6, and the heat of the power device is taken out. After the first heat exchange loop pipeline branch, a part of the refrigerant passes through the fan coil electronic expansion valve 3 and then flows through the fan coil 8 to take away the heat of the air in the cabinet. The temperature measurement of the in-cabinet environment temperature sensor 4, the out-cabinet environment temperature sensor 5 and the radiator temperature sensor 7 is carried out, temperature signals can be uploaded to the controller 12, after the actual temperature and the target temperature are processed by the controller 12, the opening size of the pipe orifice of the fan coil electronic expansion valve 3 is controlled, the temperature of the plate heat exchanger is more than 5 ℃ and more than the in-cabinet environment temperature and more than the out-cabinet environment temperature, and therefore when the electric cabinet is stably operated with loads, the operation temperature of the electric cabinet body is kept relatively stable and in the cabinet, and no condensate water is generated outside the cabinet.
Other embodiments are not described in detail. It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.
Claims (9)
1. The utility model provides a refrigerant cooling device for two return circuit central air conditioning frequency conversion electricity cabinets which characterized in that sets up two heat transfer circuit in the cabinet:
the first heat exchange loop comprises a first electronic expansion valve and a plate heat exchanger, the inlet end of the first electronic expansion valve is communicated with the right outlet of the plate heat exchanger, and the outlet end of the first electronic expansion valve is a refrigerant outlet;
the second heat exchange loop comprises a second expansion valve and a fan coil, the inlet end of the second expansion valve is communicated with the left inlet of the plate heat exchanger, the outlet end of the second expansion valve is communicated with the upper side pipe inlet of the fan coil, and the lower part of the fan coil is provided with a refrigerant outlet;
temperature sensors are respectively arranged in the plate heat exchanger, in the cabinet body and outside the cabinet body, and each temperature sensor is in signal connection with the controller.
2. The cooling device for the cooling medium of the inverter cabinet of the dual-loop central air-conditioning according to claim 1, wherein the plate heat exchanger is installed at the middle upper position of the housing back plate of the inverter cabinet of the central air-conditioning, and the left side pipe orifice of the plate heat exchanger is communicated with the cooling medium inlet and the right side pipe orifice is communicated with the cooling medium outlet.
3. The cooling device of claim 1, wherein the fan coil is disposed below the plate heat exchanger, the upper inlet of the fan coil is connected to the inlet of the refrigerant, and the lower inlet is connected to the outlet of the refrigerant.
4. The refrigerant cooling device for the variable-frequency electric cabinet of the double-loop central air conditioner as claimed in claim 1, wherein the water pan is installed under the fan coil, and the bottom of the water pan is communicated with the water outlet pipeline and extends out of the cabinet to serve as a condensed water outlet.
5. The cooling medium cooling device as claimed in claim 1, wherein the fan is installed on the fan coil and the wind direction is upward.
6. The refrigerant cooling device for the variable-frequency electric cabinet of the double-loop central air-conditioning according to claim 1, wherein the radiator temperature sensor is installed at the central position of the plate heat exchanger.
7. The cooling medium cooling device as claimed in claim 1, wherein the external ambient temperature sensor is mounted on the top plate of the casing and extends out of the cabinet.
8. The cooling medium cooling device for the frequency conversion electric cabinet of the double-loop central air conditioner as claimed in claim 1, wherein the ambient temperature sensor in the cabinet is installed above the plate heat exchanger.
9. The cooling medium cooling device as claimed in claim 1, wherein the controller is connected to the first electronic expansion valve, the second electronic expansion valve, the fan, the in-cabinet ambient temperature sensor, the out-cabinet ambient temperature sensor, and the radiator temperature sensor via control lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355376.2U CN216204188U (en) | 2021-09-27 | 2021-09-27 | Refrigerant cooling device for double-loop central air-conditioning frequency conversion electric cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122355376.2U CN216204188U (en) | 2021-09-27 | 2021-09-27 | Refrigerant cooling device for double-loop central air-conditioning frequency conversion electric cabinet |
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| CN216204188U true CN216204188U (en) | 2022-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857808A (en) * | 2022-05-31 | 2022-08-05 | 青岛海信日立空调系统有限公司 | Cooling system and control method thereof |
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2021
- 2021-09-27 CN CN202122355376.2U patent/CN216204188U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857808A (en) * | 2022-05-31 | 2022-08-05 | 青岛海信日立空调系统有限公司 | Cooling system and control method thereof |
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