Refrigeration air conditioning equipment used in high-temperature environment

Abstract

The utility model discloses refrigeration air conditioning equipment used in a high-temperature environment, which comprises a refrigerant circulation loop formed by a compressor, a condenser, a refrigeration capillary tube and an evaporator device, a normally-open electromagnetic valve is connected into a pipeline at the inlet end of one evaporator in a communicating mode, a bypass throttling pipeline system is further included, the bypass throttling pipeline system is formed by connecting a normally-closed electromagnetic valve and a capillary tube in series, and the inlet end of the normally-closed electromagnetic valve in the bypass throttling pipeline system is communicated between the condenser and the refrigerating capillary tube through a pipeline bypass. And the outlet end of the capillary tube is communicated between the evaporator device and the compressor through a pipeline bypass. According to the utility model, the condition of protection shutdown caused by over-high temperature of a refrigerant in the system due to heat exchange at a relatively high environment temperature can be avoided.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration and air conditioning, in particular to refrigeration and air conditioning equipment used in high-temperature environments. Background Art

[0002] At present, cold liquid equipment is widely used in military and aviation, power electronics, power stations, printing equipment, semiconductor equipment, communications and supercomputers. In recent years, especially with the emergence of a large number of high-power electronic equipment, refrigeration and air-conditioning equipment has gradually developed towards use in high-temperature environments.

[0003] The main purpose of refrigeration and air conditioning equipment is to provide a certain amount of low-temperature air for the staff and high-power electronic equipment in the cabin. At present, refrigeration and air conditioning equipment mainly uses the principle of compression refrigeration. The usual refrigeration and air conditioning equipment uses a compressor for refrigeration. The evaporating fan makes the high-temperature air in the cabin exchange heat with the low-temperature refrigerant in the evaporator. The cooled air is then blown into the cabin to reduce the temperature in the cabin. The low-temperature refrigerant in the evaporator will absorb the heat after the exchange into the condenser through the system operation, and discharged to the outdoor atmosphere through the condensing fan. However, when the external ambient temperature is high, the heat inside the system will not be fully discharged to the outdoor atmosphere, causing the internal pressure and temperature of the system to rise, resulting in system overheating protection, and the refrigeration work cannot continue, causing the electronic equipment in the cabin to stop working. Utility Model Content

[0004] The utility model provides a refrigeration and air-conditioning device used in a high-temperature environment, so as to solve the problem that the cabin refrigeration and air-conditioning device in the prior art cannot perform normal refrigeration work when the ambient temperature is high.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A refrigeration and air conditioning device for use in a high-temperature environment, comprising a compressor (1), a condenser (2), a refrigeration capillary tube (4), and an evaporator device, wherein the compressor (1), the condenser (2), the refrigeration capillary tube (4), and the evaporator device are connected via a pipeline to form a refrigerant circulation loop, wherein the evaporator device is an evaporator parallel structure formed by two groups of evaporators arranged side by side and connected in parallel via a pipeline, wherein a normally open type electromagnetic valve (7) is connected to a pipeline at an inlet end of one of the evaporators in the evaporator parallel structure; the evaporator parallel structure also comprises a normally closed type electromagnetic valve (8) and a capillary tube (9), wherein an outlet end of the normally closed type electromagnetic valve (8) is connected to an inlet end of the capillary tube (9) via a pipeline, wherein the inlet end of the normally closed type electromagnetic valve (8) is connected to a pipeline between the condenser (2) and the refrigeration capillary tube (4) via a pipeline bypass, and an outlet end of the capillary tube (9) is connected to a pipeline between the evaporator device and the compressor (1) via a pipeline bypass.

[0007] Furthermore, it also includes a controller (10), wherein the controller (10) is electrically connected to the normally open solenoid valve (7) and the normally closed solenoid valve (8) for control.

[0008] Furthermore, it also includes an environmental temperature sensing head (11), wherein the environmental temperature sensing head (11) senses the external environmental temperature, and the environmental temperature sensing head (11) is electrically connected to the controller (10) for signal transmission.

[0009] Furthermore, it also includes a return air temperature sensor (12), wherein the return air temperature sensor (12) senses the temperature of the refrigerant returning from the evaporator device to the compressor (1), and the return air temperature sensor (12) is electrically connected to the controller (10) for signal transmission.

[0010] In the utility model, two groups of small-area evaporators are used to replace a large-area evaporator for heat exchange mode. The two groups of evaporators are arranged side by side and integrated into one body, and the two groups of evaporators are connected in parallel. At the same time, a bypass throttling pipeline system consisting of a normally closed electromagnetic valve and a capillary tube is added between the system condensation and the compressor return air. In this way, the purpose of refrigeration work can be achieved both under normal ambient temperature and under high temperature environment.

[0011] Under normal refrigeration environment temperature, the bypass throttling pipeline system is closed, and both evaporators are put into use. The entire refrigeration cycle system is in operation. When the ambient temperature is too high, one evaporator is closed to reduce the indoor heat exchange area. The refrigerant in the system will not be overheated due to excessive heat exchange, and the system will not be shut down due to excessive internal temperature. At the same time, the normally closed solenoid valve on the bypass throttling pipeline system opens due to excessive return air temperature. Part of the refrigerant enters the return air pipeline through the capillary throttling and pressure reduction to form a low-temperature liquid refrigerant, which is mixed with the evaporated high-temperature refrigerant, thereby reducing the return air temperature. This allows the refrigeration and air-conditioning equipment to be used at high temperatures.

[0012] Beneficial effects of the utility model:

[0013] 1. The refrigeration system of the utility model is designed to combine two groups of evaporator heat exchange working modes, which can achieve the purpose of rapid refrigeration at normal ambient temperature, and avoid the situation where the temperature of the refrigerant inside the system is too high due to heat exchange and the system is shut down for protection at a higher ambient temperature, thereby achieving the purpose of continuing refrigeration work in a high temperature environment.

[0014] 2. In the design of the refrigeration system of the utility model, two groups of evaporators are physically integrated together, which reduces the volume of the unit and shares the evaporation fan, thereby saving costs.

[0015] 3. The refrigeration system of the utility model improves the system's ability to adapt to changes in various climatic conditions by adjusting the system's internal structure, so that the equipment fully meets the wide temperature design. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural principle diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, this embodiment discloses a refrigeration and air conditioning device used in a high temperature environment, including a refrigerant circulation circuit composed of a compressor 1, a condenser 2, a refrigeration capillary tube 4, and an evaporator device, a bypass throttling pipeline system composed of a normally closed solenoid valve 8 and a capillary tube 9, and an electrical control system composed of a controller 10, an ambient temperature sensor 10, and a return air temperature sensor 12. Among them:

[0019] In the refrigerant circulation loop, the refrigerant outlet of the compressor 1 is connected to the inlet of the condenser 2 through a pipeline. The condenser 2 is arranged on the outdoor side and is equipped with a condensing fan 3. The outlet of the condenser 2 is connected to the inlet of the refrigeration capillary 4 through a pipeline. The evaporator device includes a first evaporator 5-1 and a second evaporator 5-2. The first evaporator 5-1 and the second evaporator 5-2 are arranged side by side and physically integrated together. The inlet of the first evaporator 5-1 and the second evaporator 5-2 are connected to the outlet of the refrigeration capillary 4 through a pipeline. The outlet of the first evaporator 5-1 and the second evaporator 5-2 are connected to the refrigerant return port of the compressor 1 through a pipeline, so that the first evaporator 5-1 and the second evaporator 5-2 in the evaporator device are connected in parallel to form an evaporator parallel structure and then connected to the refrigerant circulation loop. In addition, in the evaporator device, a normally open solenoid valve 7 is connected to the inlet pipeline of the second evaporator 5-2. The entire evaporator device is arranged on the indoor side, and the first evaporator 5 - 1 and the second evaporator 5 - 2 in the evaporator device share the evaporation fan 6 .

[0020] In the bypass throttling pipeline, the outlet end of the normally closed solenoid valve 8 is connected to the inlet end of the capillary tube 9 through a pipeline, the inlet end of the normally closed solenoid valve 8 is connected to the pipeline between the outlet end of the condenser 2 and the inlet end of the refrigeration capillary tube 4 through a pipeline bypass, and the outlet end of the capillary tube 9 is connected to the pipeline between the evaporator device and the refrigerant return end of the compressor (1) through a pipeline bypass.

[0021] In the electrical control system, the environment temperature sensor 11 is arranged in the outdoor environment, and the external environment temperature is sensed by the environment temperature sensor 11; the return air temperature sensor 12 is arranged in the pipeline between the evaporator device and the refrigerant return end of the compressor 1, and the return air temperature sensor 12 senses the refrigerant temperature returned from the evaporator device to the compressor 1. The environment temperature sensor 11 and the return air temperature sensor 12 are respectively electrically connected to the controller 10 for signal transmission.

[0022] Under normal refrigeration ambient temperature, the refrigeration cycle system operates, and the low-temperature, low-pressure refrigerant vapor is compressed by the compressor 1 into high-temperature, high-pressure vapor, enters the outdoor condenser 2, and discharges heat to the outside through the condensing fan 3, condenses into a high-pressure saturated liquid, and then enters the first evaporator 5-1 and the second evaporator 5-2 on the indoor side through the refrigeration capillary 4 for throttling and pressure reduction, and boils inside, vaporizes and absorbs heat to exchange heat with the hot air in the room. The cooled air is sucked in by the evaporating fan 6 and then enters the room, completing the indoor ventilation and cooling cycle and lowering the indoor temperature. Finally, the refrigerant flowing out of the first evaporator 5-1 and the second evaporator 5-2 returns to the compressor 1, thereby completing the refrigerant cycle.

[0023] When the outdoor ambient temperature is too high, it is sensed by the ambient temperature sensor 11 and sent to the controller 10. After the controller 10 compares it with the set value, the controller 10 closes the normally open solenoid valve 7, so that the second evaporator 5-2 is no longer performing heat exchange. At this time, the refrigerant that has been throttled and depressurized by the refrigeration capillary 4 all enters the first evaporator 5-1 on the indoor side, and boils inside it, vaporizes and absorbs heat to perform heat exchange with the hot air in the room. The cooled air is sucked in by the evaporating fan 6 and then enters the room, completing the indoor ventilation and cooling cycle and lowering the indoor temperature. Since the second evaporator 5-2 fails to participate in the heat exchange, the total heat exchange area on the indoor side is reduced, and the refrigerant in the system will not be overheated due to excessive heat exchange, and the system will not cause a protective shutdown due to the internal temperature being too high and having nowhere to release.

[0024] When the return air temperature is too high, it is sensed by the return air temperature sensor 12 and sent to the controller 10. After being compared with the set value by the controller 10, the controller 10 opens the normally closed solenoid valve 8. At this time, part of the refrigerant enters the return air pipeline through the capillary tube 9 on the bypass pipeline to form a low-temperature liquid refrigerant after throttling and pressure reduction, and mixes with the evaporated high-temperature refrigerant to reduce the return air temperature, thereby reducing the exhaust temperature and reducing the compressor workload, thereby achieving the purpose of using the refrigeration and air-conditioning equipment at high temperatures.

[0025] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. Such combinations should also be regarded as the contents disclosed in the present disclosure as long as they do not violate the concept of the present invention. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0026] The present invention is not limited to the specific details in the above-mentioned embodiments. Within the technical concept of the present invention and without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A refrigeration and air conditioning device for use in a high temperature environment, comprising a compressor (1), a condenser (2), a refrigeration capillary tube (4), and an evaporator device, wherein the compressor (1), the condenser (2), the refrigeration capillary tube (4), and the evaporator device are connected by a pipeline to form a refrigerant circulation loop, characterized in that: The evaporator device is an evaporator parallel structure formed by two groups of evaporators arranged side by side and connected in parallel with each other through pipelines. The evaporator parallel structure has a pipeline at the inlet end of one of the evaporators connected to a normally open solenoid valve (7). The evaporator parallel structure also includes a normally closed solenoid valve (8) and a capillary tube (9). The outlet end of the normally closed solenoid valve (8) is connected to the inlet end of the capillary tube (9) through a pipeline. The inlet end of the normally closed solenoid valve (8) is connected to the pipeline between the condenser (2) and the refrigeration capillary tube (4) through a pipeline bypass. The outlet end of the capillary tube (9) is connected to the pipeline between the evaporator device and the compressor (1) through a pipeline bypass.

2. The refrigeration and air conditioning equipment used in a high temperature environment according to claim 1, characterized in that: It also includes a controller (10), wherein the controller (10) is electrically connected to the normally open electromagnetic valve (7) and the normally closed electromagnetic valve (8) respectively.

3. The refrigeration and air conditioning equipment used in a high temperature environment according to claim 2, characterized in that: It also comprises an environmental temperature sensing head (11), the environmental temperature sensing head (11) senses the external environmental temperature, and the environmental temperature sensing head (11) is electrically connected to the controller (10) for signal transmission.

4. The refrigeration and air conditioning equipment used in a high temperature environment according to claim 2, characterized in that: It also includes a return air temperature sensor (12), the return air temperature sensor (12) sensing the temperature of the refrigerant returning from the evaporator device to the compressor (1), and the return air temperature sensor (12) is electrically connected to the controller (10) for signal transmission.

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