Mute box for indoor unit

Abstract

The mute box comprises an electric valve, a throttling mechanism and an electronic expansion valve, the first end of the electric valve is connected with an indoor heat exchanger, the second end of the electric valve is connected with an indoor unit air pipe, and the third end of the electric valve is connected with the throttling mechanism; the throttling mechanism is connected with the electronic expansion valve, one end of the electronic expansion valve is connected with an indoor unit liquid pipe, and the other end of the electronic expansion valve is connected to the indoor unit electronic expansion valve. The silence box is connected between the branch pipe and the indoor unit, throttling and cooling are achieved through an electronic expansion valve of the silence box, it is guaranteed that the electronic expansion valve of the indoor unit is fully opened, and refrigerant sound during refrigeration is reduced. Gaseous refrigerants can be completely isolated from entering the indoor unit, and flowing sound of the refrigerants is completely eradicated; when the air conditioner is used for heating, the refrigerant flow of the bypass of the indoor unit can be adjusted and stopped, the exhaust pressure is reduced, the supercooling degree of the running indoor unit is improved, and then the refrigerant flowing sound of the started indoor unit is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning equipment, and in particular relates to a mute box for an indoor unit. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements for the comfort of air conditioning. Among them, multi-split air-conditioning systems have gradually become the main direction of air-conditioning development due to their flexibility, energy saving, high control accuracy and easy installation.

[0003] The multi-split air conditioning system is mainly composed of one or more outdoor units and multiple indoor units. The units are connected through communication lines, and the temperature and humidity adjustment of the indoor units is controlled by wire controllers. The outdoor unit is composed of outdoor heat exchangers, electronic expansion valves, fans and other components, and the indoor unit is composed of indoor heat exchangers, fans, electronic expansion valves and other components. The functions of the evaporator and condenser can be adjusted through a single four-way reversing valve to achieve simultaneous cooling or heating of all indoor units. When the indoor unit is cooling, in order to ensure that the refrigerant flowing through the indoor unit is a low-temperature and low-pressure liquid refrigerant, the electronic expansion valve in the indoor unit needs to be throttled at a small opening. At this time, the smaller diameter of the electronic expansion valve will cause a sudden change in the flow rate of the refrigerant and produce refrigerant flow sound. When the indoor unit is heating, in order to ensure that the indoor heat exchanger does not accumulate a large amount of liquid refrigerant, the stopped indoor unit needs to ensure that the electronic expansion valve of the stopped indoor unit is slightly opened for heat exchange. At this time, the stopped indoor unit will also have refrigerant flow sound. During high-temperature heating conditions, the indoor unit is stopped from slightly opening, resulting in excessive refrigerant circulation, causing excessive high pressure. The subcooling degree of the indoor unit is small and the refrigerant circulation speed becomes faster, causing the refrigerant flow sound to be loud when the unit is turned on. Summary of the invention

[0004] The utility model provides a mute box for an indoor unit, which solves the problem that the indoor unit of the existing air-conditioning system has refrigerant flow noise which cannot be effectively eliminated.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a silent box for an indoor unit, comprising an electric valve, a throttling mechanism, and an electronic expansion valve, wherein the first end of the electric valve is connected to the indoor heat exchanger, the second end is connected to the indoor unit air pipe, and the third end is connected to the throttling mechanism; the throttling mechanism is connected to the electronic expansion valve, one end of the electronic expansion valve is connected to the indoor unit liquid pipe, and the other end is connected to the indoor unit electronic expansion valve.

[0006] Preferably, a filter is further included, and one end of the electric valve connected to the throttling mechanism is connected to the filter.

[0007] Preferably, the electric valve is an electric two-way ball valve.

[0008] Preferably, the throttling mechanism adopts a capillary tube.

[0009] Preferably, it also includes a box body, and the electric valve, throttling mechanism, electronic expansion valve and filter are all arranged in the box body.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model discloses a silent box for an indoor unit, which is an external device for the indoor unit and is connected between the branch pipe and the indoor unit. The electronic expansion valve of the valve box liquid pipe throttles and cools the indoor unit, thereby ensuring that the electronic expansion valve on the indoor side is fully open and reducing the refrigerant sound during cooling. The utility model can completely isolate the gaseous refrigerant from entering the indoor unit and completely prevent the refrigerant flow sound. When the air conditioner is heating, the refrigerant flow rate of the bypass that stops the indoor unit can be adjusted to reduce the exhaust pressure and increase the supercooling degree of the running indoor unit, thereby reducing the refrigerant flow sound of the indoor unit when it is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the principle of the mute box of the utility model when it is used in the refrigeration operation of the unit;

[0013] Figure 2 This is a schematic diagram of the principle of applying the mute box of the utility model to the indoor unit of the unit during heating operation and shutdown;

[0014] Figure 3 The utility model is a schematic diagram of the principle of applying the mute box to the indoor unit of the unit during heating operation.

[0015] In the figure: electric valve 1, throttling mechanism 2, electronic expansion valve 3, indoor heat exchanger 4, indoor unit gas pipe 5, indoor unit liquid pipe 6, indoor unit electronic expansion valve 7, filter 8, box body 9. DETAILED DESCRIPTION

[0016] 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.

[0017] See also Figure 1-3 The utility model provides the following technical solutions: a silent box for an indoor unit, comprising an electric valve 1, a throttling mechanism 2, and an electronic expansion valve 3, wherein the first end of the electric valve 1 is connected to an indoor heat exchanger 4, the second end is connected to an indoor unit gas pipe 5, and the third end is connected to the throttling mechanism 2; the throttling mechanism 2 is connected to the electronic expansion valve 3, one end of the electronic expansion valve 3 is connected to an indoor unit liquid pipe 6, and the other end is connected to an indoor unit electronic expansion valve 7.

[0018] As a preferred implementation manner of this embodiment, a filter 8 is further included, and one end where the electric valve 1 and the throttling mechanism 2 are connected is connected to the filter 8 .

[0019] As a preferred implementation of this embodiment, the electric valve 1 is an electric two-way ball valve.

[0020] As a preferred implementation of this embodiment, the throttling mechanism 2 adopts a capillary tube.

[0021] As a preferred implementation of this embodiment, it also includes a box body 9, and the electric valve 1, the throttling mechanism 2, the electronic expansion valve 3, and the filter 8 are all arranged in the box body 9.

[0022] like Figure 1 As shown, when the unit is in cooling operation, the indoor unit electronic expansion valve 7 is fully opened, and the electronic expansion valve 3 of the silent box adjusts the opening according to the superheat control target of the indoor unit. At this time, the electric two-way ball valve is closed in the vertical direction and opened in the horizontal direction. At this time, the throttling components are all in the silent box, and the refrigerant flow noise is greatly improved.

[0023] like Figure 2 As shown, when the outdoor unit is heating, the electronic expansion valve 7 of the stopped indoor unit is closed, the electric two-way ball valve of the mute box is closed in the horizontal direction and opened in the vertical direction, and the electronic expansion valve 3 opens to a corresponding degree according to the supercooling degree of the indoor unit. Since no refrigerant flows on the user side, the refrigerant flow sound of the indoor unit in heating standby mode can be eliminated.

[0024] like Figure 3 As shown, the electronic expansion valve 7 of the indoor unit of the indoor unit that is turned on for heating is fully open. At this time, the electric two-way ball valve is opened in the horizontal direction and closed in the vertical direction. The electronic expansion valve 3 of the silent box adjusts the opening according to the supercooling degree of the indoor unit. Since the indoor electronic expansion valve is fully open without throttling, and since the bypass effect of the silent box of the indoor unit is stopped, the pressure ratio of the whole machine is reduced, the refrigerant flow rate is slowed down, and the supercooling degree of the indoor unit is increased. At this time, the refrigerant flow noise of the indoor unit that is turned on is greatly improved.

[0025] 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 soundproof box for an indoor unit, characterized in that: It includes an electric valve, a throttling mechanism, and an electronic expansion valve. The first end of the electric valve is connected to the indoor heat exchange, the second end is connected to the indoor unit gas pipe, and the third end is connected to the throttling mechanism; the throttling mechanism is connected to the electronic expansion valve, one end of the electronic expansion valve is connected to the indoor unit liquid pipe, and the other end is connected to the indoor unit electronic expansion valve.

2. The soundproof box for indoor unit according to claim 1, characterized in that: It also includes a filter, and one end of the electric valve connected to the throttling mechanism is connected to the filter.

3. The soundproof box for indoor unit according to claim 1, characterized in that: The electric valve adopts an electric two-way ball valve.

4. The sound-proof box for an indoor unit according to claim 1, characterized in that: The throttling mechanism adopts a capillary tube.

5. The sound-proof box for indoor unit according to claim 2, characterized in that: It also includes a box body, in which the electric valve, throttling mechanism, electronic expansion valve and filter are all arranged.

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