CN216693770U

CN216693770U - Multi-split system for reducing noise of multi-split indoor unit

Info

Publication number: CN216693770U
Application number: CN202123352293.4U
Authority: CN
Inventors: 李安林; 时红臣; 荆艳强; 李世博
Original assignee: Zhengzhou Zhibo Intelligent Technology Co ltd
Current assignee: Zhengzhou Zhibo Environmental Technology Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-06-07
Anticipated expiration: 2031-12-29

Abstract

A multi-split system for reducing noise of an indoor unit of a multi-split system comprises the indoor unit, the outdoor unit and a pipeline for connecting the indoor unit and the outdoor unit, wherein the indoor unit comprises a plurality of air heat exchangers, and an electronic expansion valve of each air heat exchanger is divided into a standby electronic expansion valve and a starting electronic expansion valve; the outdoor unit comprises a compressor and fittings, and a liquid pipe pressure sensor is additionally arranged between an electronic expansion valve and a liquid pipe stop valve of the outdoor unit and used for detecting the pressure of the liquid pipe. According to the method, on the basis of the existing machine, the pressure of a test liquid pipe is increased and is compared with the pressure of the exhaust side of a compressor, the opening condition of an electronic expansion valve of an outer machine is observed, and the refrigerant sound of a standby indoor machine is obviously reduced and the time of the refrigerant sound of the indoor machine is shortened by adjusting the electronic expansion valves of the starting indoor machine, the standby indoor machine and the outer machine; and the problem of installation space is not involved, only 1 pressure sensor needs to be added to one set of system, and the practicability and the economical efficiency are better.

Description

Multi-split system for reducing noise of multi-split indoor unit

Technical Field

The patent application belongs to the field of multi-split air conditioners, particularly relates to a control method for reducing noise in a multi-split air conditioner, and provides a multi-split system adopting the method.

Background

With the increasing of the multi-online market scale and the increasing use of home decoration and office buildings, the requirement on the silence is higher; the existing multi-connected standby indoor unit mainly controls an electronic expansion valve of the indoor unit through the supercooling degree of the indoor unit, and because the number of the multi-connected indoor units is large, the installation positions are different, and the set temperatures of the indoor units are different, the indoor unit can be started without interruption until the temperature is stopped, and the indoor unit is started after the temperature of the machine which is stopped until the temperature is lowered, so that the load of the whole system is continuously adjusted, the frequency, the pressure, the refrigerant and other states of a compressor are constantly changed, and the pressure difference between the front and the back of the electronic expansion valve of the indoor unit can be changed at any time, so that the airflow sound of the refrigerant is generated. The main problems are focused on:

1. when the existing multi-split air conditioner is started in a heating mode, the electronic expansion valve of the standby indoor unit is opened to a certain opening degree, the electronic expansion valve flows due to the refrigerant and is positioned on a high-pressure side, the electronic expansion valve is in a reverse state, and when the electronic expansion valve is not adjusted properly, the standby indoor unit can generate refrigerant airflow sound to seriously affect user experience.

2. The existing multi-split standby indoor unit mainly controls an electronic expansion valve of the indoor unit through the supercooling degree of the indoor unit, and the pressure change condition cannot be captured in time when the load changes, so that the condition that the front-back pressure difference of the electronic expansion valve of the indoor unit is large often occurs, and cannot be adjusted in time, so that air flow sound is generated and the duration is long;

3. as shown in fig. 1, the electronic expansion valve bypass circuit 4 and the solenoid valve 5 are additionally arranged for control, so that the manufacturing difficulty and operability are seriously affected, the space of the indoor unit 1 is extremely small, main control board hardware needs to be additionally arranged, the number of the indoor units is large, and the practicability and the economical efficiency are poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a control method for reducing the noise of an indoor unit of a multi-split air conditioner and a multi-split air conditioner system, which are simple to modify and do not occupy space.

The technical scheme of the utility model is as follows:

a system for reducing noise of an indoor unit of a multi-connected unit comprises the indoor unit, the outdoor unit and a pipeline connected with the indoor unit and the outdoor unit, wherein the indoor unit comprises a plurality of air heat exchangers, and an electronic expansion valve of each air heat exchanger is divided into a standby electronic expansion valve and a starting electronic expansion valve; the outdoor unit comprises a compressor and fittings, and a liquid pipe pressure sensor is additionally arranged between an electronic expansion valve and a liquid pipe stop valve of the outdoor unit and used for detecting the pressure of the liquid pipe.

The tube pressure sensor is a Pli tube.

The utility model has the beneficial effects that: according to the method, on the basis of the existing machine, the pressure of a test liquid pipe is increased and compared with the exhaust side pressure of a compressor, the opening condition of an electronic expansion valve of an outer machine is observed, and the refrigerant sound of a standby indoor machine is obviously reduced and the time of the refrigerant sound of the indoor machine is shortened by adjusting an internal machine of the starting machine, the electronic expansion valve of the standby indoor machine and the electronic expansion valve of the outer machine; and the problem of installation space is not involved, and one set of system only needs to increase 1 pressure sensor, and practicality and economic nature are better.

Drawings

FIG. 1 is a prior art schematic;

fig. 2 is a schematic diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 2, a system for reducing noise in a multi-connected unit includes an indoor unit 1, an outdoor unit 2, and a pipeline connecting the indoor unit 1 and the outdoor unit 2, where the indoor unit 1 includes a plurality of air heat exchangers 3, and an electronic expansion valve in each air heat exchanger 3 is divided into a standby electronic expansion valve 9 and a startup electronic expansion valve 10; the outdoor unit 2 comprises a compressor and fittings, and a liquid pipe pressure sensor 8 is added between an electronic expansion valve 6 and a liquid pipe stop valve 7 of the outdoor unit for detecting liquid pipe pressure; the tube pressure sensor 8 is a Pli tube.

The control method for reducing the noise of the multi-connected indoor unit by adopting the system comprises the following steps:

1. during heating operation, detecting a difference value A between the high-pressure Pd and the liquid pipe pressure sensor 8; the high pressure Pd is the high pressure side pressure of the outdoor unit, i.e. the pressure of the high pressure side pipeline entering the outdoor unit, and the pressure measured by the liquid pipe pressure sensor 8 is the pressure of the pipeline entering the indoor unit from the outdoor unit.

2. Dividing the difference A into three intervals B1, B2 and B3, wherein B1 is more than B2 and more than B3;

3. when the difference A is less than or equal to B1, the difference is in a normal range, the air flow sound of the standby electronic expansion valve 9 of the indoor unit is very small or even no through the real machine test, and the control is normal and does not need to be carried out at the moment;

4. when the difference A is more than B1 and less than or equal to B2, increasing the opening degree of C1 of the starting electronic expansion valve 10, if the difference A can be recovered to be less than or equal to B1, then normally controlling according to normal logic, and if the difference A is still in the interval after continuously controlling for 2 control cycles, continuing the previous adjusting step;

5. when the difference A is more than B2 and less than or equal to B3, increasing the threshold of the electronic expansion valve 10 for starting up to the maximum opening, simultaneously increasing the threshold of the electronic expansion valve 9 for standby to the opening D1, if the electronic expansion valve is recovered to the upper interval, controlling according to the upper interval, and if 2 control cycles are still in the interval, continuing the previous adjusting step;

6. and when the B3 is less than the difference A, increasing the opening degree of the starting electronic expansion valve 10 to the maximum opening degree, increasing the opening degree of the standby electronic expansion valve 9 to D2, simultaneously closing the opening degree of the outer machine electronic expansion valve 6 to the E1, controlling the starting electronic expansion valve according to the interval if the starting electronic expansion valve returns to the interval above, and continuing to adjust the starting electronic expansion valve according to the previous steps if the starting electronic expansion valve continues to be in the interval for 2 continuous control cycles.

C1 and E1 are independent of each other and may have any value; the opening degree value D1 is less than D2.

From this, the practical effect that this patent application reached is:

1. by the control, the noise of the standby indoor unit can be eliminated in time, and the comfort is improved particularly when the load changes;

2. the pressure operation is more stable, and the machine is more reliable;

3. the electronic expansion valve of the indoor unit can not be larger than the reverse valve opening pressure difference any more, and the reliability is ensured.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.

Claims

1. A multi-online system for reducing noise of an indoor unit of a multi-online machine comprises an indoor unit (1), an outdoor unit (2) and a pipeline for connecting the indoor unit (1) and the outdoor unit (2), wherein the indoor unit (1) comprises a plurality of air heat exchangers (3), and an electronic expansion valve of each air heat exchanger (3) is divided into a standby electronic expansion valve (9) and a starting electronic expansion valve (10); the outdoor unit (2) comprises a compressor and accessories, and is characterized in that: a liquid pipe pressure sensor (8) is added between an electronic expansion valve (6) and a liquid pipe stop valve (7) of the outdoor unit and used for detecting the liquid pipe pressure.

2. A multi-online system for reducing noise of a multi-online indoor unit according to claim 1, wherein: the liquid tube pressure sensor (8) is a Pli liquid tube.