DX unit air suction low-temperature protection device

Abstract

The utility model relates to the technical field of air conditioning units, and provides a DX unit air suction low-temperature protection device which comprises a unit shell and an evaporator arranged in the unit shell, a first communicating pipe and a second communicating pipe are arranged on the lower portion of the evaporator, and the evaporator is communicated with an expansion valve through the first communicating pipe. The evaporator is communicated with a separating pipe through a second communicating pipe, one end of the separating pipe is communicated with the compressor, a heating assembly used for heating the air suction temperature of the compressor is arranged in the unit shell and comprises a pre-cooling coil fixedly installed in the unit shell, and one end of the pre-cooling coil is communicated with the separating pipe. According to the utility model, through the arrangement of the heating assembly, the function of heating the airflow with lower temperature is realized, so that the phenomenon that the return air carries liquid in the compressor is reduced, the protection on the compressor is improved, and meanwhile, through the arrangement of the retention sleeve, the heating effect of the airflow is improved by increasing the heating time of the airflow.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning units, in particular to a DX unit air intake low temperature protection device. Background Art

[0002] The working principle of DX unit is to use refrigerant to absorb the heat of the cooled object in the evaporator, then transfer the heat to the cooling water in the condenser, and then dissipate the heat to the atmosphere through the circulation of cooling water. The suction process of DX unit is to suck the refrigerant into the compressor. If the suction temperature is too low, it may cause the return gas to carry liquid, and even cause wet stroke liquid shock to damage the compressor. In view of this, we propose a DX unit suction low temperature protection device. Utility Model Content

[0003] The utility model aims to solve the problem that the suction temperature of the compressor in the existing DX unit is not high, which easily generates return gas with liquid and thus damages the compressor, and proposes a DX unit suction low temperature protection device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A DX unit suction low temperature protection device comprises a unit shell, and an evaporator arranged inside the unit shell, wherein a connecting pipe 1 and a connecting pipe 2 are arranged at the lower part of the evaporator, the evaporator is connected to the expansion valve through the connecting pipe 1, the evaporator is connected to a separation pipe through the connecting pipe 2, and one end of the separation pipe is connected to the compressor, and a heating component for heating the suction temperature of the compressor is arranged inside the unit shell;

[0006] The heating component includes a precooling coil fixedly installed inside the unit casing, one end of the precooling coil is connected to the separation pipe, and the other end is provided with a return air pipe connected to the separation pipe, solenoid valves are respectively provided at both ends of the separation pipe, and a temperature sensor electrically connected to the solenoid valve is provided at the connection between the separation pipe and the compressor, a fan is provided at one end of the unit casing, and an air inlet for air intake is provided at the other end.

[0007] Preferably, a retention sleeve is provided inside the precooling coil, and the retention sleeve is conical in shape, with the smallest end opposite to the airflow direction.

[0008] Preferably, a dust removal assembly for cleaning dust outside the precooling coil is provided inside the unit casing, and the dust removal assembly includes a pull plate slidably installed inside the unit casing, and one end of the pull plate slides and extends to the outside of the unit casing, a plurality of dust removal sleeves are provided on the external sliding sleeve of the precooling coil, and a transmission connecting rod is rotatably installed outside the dust removal sleeve, and a transmission protrusion hinged to the transmission connecting rod is fixedly installed on the upper part of the pull plate.

[0009] Preferably, a synchronous connecting rod is fixedly installed between the dust removal sleeves.

[0010] Preferably, the contact parts between the precooling coil and the dust removal sleeve are both inclined.

[0011] Preferably, the air inlet is provided with an air inlet fence.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model realizes the function of heating the airflow with a relatively low temperature by setting a heating component, thereby reducing the occurrence of return air with liquid in the compressor, thereby improving the protection of the compressor. At the same time, the setting of the retention sleeve will increase the heating time of the airflow and improve the heating effect of the airflow.

[0014] 2. The utility model can clean the dust attached to the outside of the pre-cooling coil by setting the dust removal component, ensure the heating effect of the airflow in the pre-cooling coil, and reduce the probability of compressor failure. At the same time, through the setting of the synchronous connecting rod, the staff can move any dust removal sleeve to drive all dust removal sleeves to move synchronously, thereby improving the cleaning efficiency of the attached dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a front cross-sectional view of the utility model;

[0017] Figure 3 It is a left side sectional view of the utility model;

[0018] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of area A in the middle.

[0019] In the figure: 1. Unit casing; 2. Evaporator; 3. Air inlet fence; 4. Connecting pipe 1; 5. Connecting pipe 2; 6. Separation pipe; 7. Heating component; 71. Precooling coil; 72. Temperature sensor; 73. Solenoid valve; 74. Return air pipe; 75. Fan; 76. Dust removal component; 761. Pull plate; 762. Transmission connecting rod; 763. Transmission protrusion; 764. Dust removal sleeve; 765. Synchronous connecting rod; 77. Retention sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] When the DX unit is running, if the suction temperature is too low, it may cause the return gas to carry liquid. This is because the refrigerant will produce a large amount of gas during the evaporation process. After the gas is compressed by the compressor, the temperature and pressure will increase. If the suction temperature is too low, the suction pressure of the compressor will also decrease, which will increase the compression ratio of the compressor, making it easier for the refrigerant vapor to reach a saturated state. When the refrigerant vapor reaches a saturated state, it will begin to condense into liquid. If this process occurs in the compressor, it will cause the return gas to carry liquid. The return gas with liquid will have an adverse effect on the operation of the DX unit. First, it will block the suction pipe and the compressor inlet, resulting in a decrease in the refrigerant flow and a decrease in the refrigeration effect. Secondly, it will increase the burden on the compressor, increase the energy consumption of the compressor, and even cause damage to the compressor. Therefore, in order to avoid the return gas with liquid, the suction temperature should be kept within an appropriate range as much as possible. We have proposed the following solution.

[0022] Embodiment 1

[0023] Reference Figure 1-Figure 4 The DX unit suction low temperature protection device mainly consists of a unit casing 1, and an evaporator 2 arranged inside the unit casing 1. A connecting pipe 1 4 and a connecting pipe 2 5 are arranged at the lower part of the evaporator 2. The evaporator 2 is connected to the expansion valve through the connecting pipe 1 4. The evaporator 2 is connected to a separation pipe 6 through the connecting pipe 2 5, and one end of the separation pipe 6 is connected to the compressor. A heating component 7 for heating the suction temperature of the compressor is arranged inside the unit casing 1. When the DX unit is running, the liquid in the expansion valve can be sent to the evaporator 2 for evaporation through the connecting pipe 1 4. The evaporated air flow will return to the compressor through the connecting pipe 2 5 and the separation pipe 6. During the flow process, the heating component 7 arranged in the unit casing 1 will heat the air flow with a lower temperature, thereby reducing the occurrence of the return air liquid phenomenon in the compressor, thereby improving the protection of the compressor.

[0024] The heating component 7 includes a precooling coil 71 fixedly installed inside the unit housing 1. One end of the precooling coil 71 is connected to the separation pipe 6, and the other end is provided with a return air pipe 74 connected to the separation pipe 6. Solenoid valves 73 are respectively provided at both ends of the separation pipe 6. A temperature sensor 72 electrically connected to the solenoid valve 73 is provided at the connection between the separation pipe 6 and the compressor. A fan 75 is provided at one end of the unit housing 1, and an air inlet for air intake is provided at the other end. In this embodiment, the temperature of the airflow flowing into the compressor is detected by the temperature sensor 72 arranged in the separation pipe 6. If the airflow temperature is detected, When the temperature is lower than the set temperature, the solenoid valve 73 on the separation tube 6 close to the precooling coil 71 is opened to allow the air flow to enter the precooling coil 71. At the same time, the other solenoid valve 73 is closed to prevent the low-temperature air flow from directly entering the compressor. In addition, the fan 75 is started to introduce the external air flow into the unit casing 1, so that it continuously blows the precooling coil 71, thereby gradually heating the air flow entering the precooling coil 71 through the physical law of heat transfer. After the temperature is raised, the air flow will return to the separation tube 6 through the return air pipe 74, thereby completing the temperature rise operation of the compressor intake air.

[0025] A retention sleeve 77 is provided inside the precooling coil 71. The retention sleeve 77 is conical in shape, and the smallest end is opposite to the direction of air flow. Since the airflow is light in mass and has the characteristic of automatic floating, the special setting of the retention sleeve 77 will make most of the airflow flow to the connection between the retention sleeve 77 and the precooling coil 71 when the airflow contacts the retention sleeve 77. When it cannot move forward, it will flow out through the gap in the middle of the retention sleeve 77, thereby greatly extending the flow time of the airflow in the precooling coil 71, thereby increasing the heating time of the airflow, thereby improving the heating effect of the airflow and further reducing the occurrence of liquid carryover in the return air.

[0026] Embodiment 2

[0027] On the basis of Example 1, the technical solution proposed in Example 1 is used to solve the shortcomings of the existing DX unit, that is, the suction temperature of the compressor is not high, which is easy to produce return air with liquid, thereby damaging the compressor. However, since the low-temperature airflow flows in the pre-cooling coil 71, the surface temperature of the pre-cooling coil 71 will be low, thereby attracting dust in the air for adsorption, which will form a layer of thermal resistance, hindering the effective transfer of heat inside and outside the pre-cooling coil 71, resulting in a decrease in the warming effect of the airflow in the pre-cooling coil 71, and increasing the probability of compressor failure.

[0028] Reference Figure 1-Figure 4A dust removal assembly 76 for cleaning dust outside the precooling coil 71 is provided inside the unit casing 1. The dust removal assembly 76 includes a pull plate 761 slidably installed inside the unit casing 1, and one end of the pull plate 761 slides and extends to the outside of the unit casing 1. A plurality of dust removal sleeves 764 are provided on the sliding sleeve outside the precooling coil 71, and a transmission connecting rod 762 is rotatably installed on the outside of the dust removal sleeve 764. A transmission protrusion 763 hinged to the transmission connecting rod 762 is fixedly installed on the upper part of the pull plate 761. When the low-temperature airflow flows in the precooling coil 71, cold air is generated, resulting in a lower surface temperature of the precooling coil 71. This temperature difference makes the surface of the precooling coil 71 form a "cold source" relative to the surrounding environment, thereby attracting water molecules in the air to condense on the coil surface. When particulate matter such as dust and dirt in the air flows and contacts the surface of the pre-cooling coil 71 under the action of the fan 75, they are easily adhered by these condensed water molecules and then adhere to the pre-cooling coil 71. If the outer surface of the pre-cooling coil 71 is covered with dust, a layer of thermal resistance will be formed, which will hinder the effective transfer of heat inside and outside the pre-cooling coil 71, resulting in a decrease in the heating effect of the airflow in the pre-cooling coil 71 and an increase in the probability of compressor failure. To avoid this situation, the present embodiment can regularly clean the attached dust on the pre-cooling coil 71 through the provision of the dust removal sleeve 764 to ensure the normal heating of the airflow in the pre-cooling coil 71. The specific operation is as follows: the pull plate 761 can be pulled out and released at a regular interval so that it drives the dust removal sleeve 764 to reciprocate through the transmission connecting rod 762, thereby removing the dust attached to the pre-cooling coil 71 and ensuring the normal heating work.

[0029] A synchronous connecting rod 765 is fixedly installed between the dust removal sleeves 764. The setting of the synchronous connecting rod 765 allows the staff to move any dust removal sleeve 764 to drive all dust removal sleeves 764 to move synchronously, thereby improving the cleaning efficiency of attached dust.

[0030] The contact parts between the precooling coil 71 and the dust removal sleeve 764 are both inclined. The special setting of the precooling coil 71 can more conveniently clean up the dust when the dust removal sleeve 764 moves, thereby improving the convenience of the dust removal work. In addition, when the dust removal sleeve 764 moves, it will also drive the precooling coil 71 to vibrate, thereby shaking off the dust that the dust removal sleeve 764 has not touched, further improving the dust removal quality.

[0031] The air inlet is provided with an air inlet fence 3, and the setting of the air inlet fence 3 can preliminarily filter the airflow entering the unit casing 1, thereby reducing dust attached to the precooling coil 71.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A DX unit suction low temperature protection device, comprising a unit casing (1), and an evaporator (2) arranged inside the unit casing (1), wherein a connecting pipe 1 (4) and a connecting pipe 2 (5) are provided at the lower part of the evaporator (2), wherein the evaporator (2) is connected to an expansion valve via the connecting pipe 1 (4), and the evaporator (2) is connected to a separation pipe (6) via the connecting pipe 2 (5), and one end of the separation pipe (6) is connected to a compressor, wherein: A heating component (7) for heating the suction temperature of the compressor is provided inside the unit casing (1); The heating component (7) comprises a precooling coil (71) fixedly mounted inside the unit casing (1); one end of the precooling coil (71) is connected to the separation pipe (6); the other end is provided with a return air pipe (74) connected to the separation pipe (6); both ends of the separation pipe (6) are provided with solenoid valves (73); a temperature sensor (72) electrically connected to the solenoid valve (73) is provided at the connection point between the separation pipe (6) and the compressor; a fan (75) is provided at one end of the unit casing (1); and an air inlet for air intake is provided at the other end.

2. The DX unit air intake cryogenic protection device according to claim 1 is characterized in that: A retention sleeve (77) is provided inside the precooling coil (71), and the retention sleeve (77) is conical in shape, with the smallest end being opposite to the flow direction of the airflow.

3. The DX unit air intake cryogenic protection device according to claim 1 is characterized in that: A dust removal component (76) for cleaning dust outside the precooling coil (71) is provided inside the unit casing (1), and the dust removal component (76) comprises a pull plate (761) slidably mounted inside the unit casing (1), and one end of the pull plate (761) slidably extends to the outside of the unit casing (1), a plurality of dust removal sleeves (764) are slidably sleeved outside the precooling coil (71), and a transmission connecting rod (762) is rotatably mounted outside the dust removal sleeve (764), and a transmission protrusion (763) hinged to the transmission connecting rod (762) is fixedly mounted on the upper part of the pull plate (761).

4. The DX unit air intake cryogenic protection device according to claim 3 is characterized in that: A synchronous connecting rod (765) is fixedly installed between the dust removal sleeves (764).

5. The DX unit air intake cryogenic protection device according to claim 4 is characterized in that: The contact parts between the precooling coil (71) and the dust removal sleeve (764) are both arranged at an inclination.

6. The DX unit air intake cryogenic protection device according to claim 1 is characterized in that: The air inlet is provided with an air inlet fence (3).

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