CN114413530B - Liquid impact prevention flash evaporator device, air conditioner comprising same and liquid impact prevention control method - Google Patents

Abstract

The application relates to a flash evaporator device capable of preventing liquid impact, an air conditioner comprising the flash evaporator device and a liquid impact prevention control method. This prevent liquid and hit flash vessel device includes: the refrigerant partition plate, the refrigerant input pipe, the refrigerant output pipe and the air supplement pipe are arranged in the air supply pipe; the refrigerant partition plate is fixed at the bottom of the inner cavity of the flash evaporator and divides the inner cavity of the flash evaporator into a first cavity and a second cavity; the air supplementing port of the air supplementing pipe is arranged in the inner cavity of the flash evaporator, and the height of the air supplementing port relative to the bottom of the inner cavity of the flash evaporator is higher than that of the refrigerant partition plate; the refrigerant output pipe comprises a first liquid discharge pipe and a second liquid discharge pipe, the first liquid discharge pipe and the refrigerant input pipe are arranged in the first cavity, and a liquid discharge inlet of the second liquid discharge pipe is communicated with the second cavity; the refrigerant output port of the first liquid discharge pipe and the liquid discharge outlet of the second liquid discharge pipe are respectively communicated with the evaporator. The scheme that this application provided can prevent that liquid refrigerant from getting into the compressor through the tonifying qi mouth, leads to the compressor liquid to hit and damage the compressor, improves the compressor reliability, promotes the life of compressor.

Description

Liquid impact prevention flash evaporator device, air conditioner comprising same and liquid impact prevention control method

Technical Field

The application relates to the technical field of compressors, in particular to a flash evaporator device capable of preventing liquid impact, an air conditioner comprising the flash evaporator device and a liquid impact prevention control method.

Background

In an air conditioning system, an air-supplying and enthalpy-increasing scheme is generally adopted to improve unit performance. The refrigerant in the air-supplementing enthalpy-increasing system is throttled twice, liquid refrigerant flows through the flash evaporator after being throttled in the first stage, gas-liquid separation is achieved in the flash evaporator, gaseous refrigerant enters the compressor through the air supplementing port of the compressor to be compressed, and liquid refrigerant flows into the evaporator after being throttled secondarily through the expansion valve. When refrigerant flow changes, the inside refrigerant that can store certain volume of flash vessel, but the storage volume is limited, in case the refrigerant liquid level is too high, liquid refrigerant can get into the compressor through the compressor tonifying qi mouth, leads to the compressor liquid to hit and damage the compressor.

In the prior art, in a patent with publication number CN104792050B (air conditioning system and compressor), a compressor, a condenser, a first throttling device, a flash evaporator and an evaporator are sequentially connected to form a refrigeration cycle loop, the compressor includes a low-pressure stage compressor and a high-pressure stage compressor, a suction end of the low-pressure stage compressor is connected to a first port of the evaporator, a second port of the evaporator is connected to a second port of the flash evaporator, the first port of the flash evaporator is connected in series with the first throttling device to be connected to a first port of the condenser, the second port of the condenser is connected to a discharge end of the high-pressure stage compressor, and the suction end of the high-pressure stage compressor is connected to a third port of the flash evaporator; the exhaust end of the low-pressure stage compressor is connected with the first port of the flash evaporator or the third port of the flash evaporator or the fourth port of the flash evaporator.

The above prior art has the following disadvantages:

the liquid level height of the refrigerant inside the flash evaporator cannot be controlled, so that the liquid refrigerant can enter the compressor through the air supplement port of the compressor easily, the compressor is damaged due to liquid impact, and the reliability of the compressor is reduced.

Disclosure of Invention

For the problem that exists among the overcoming correlation technique, this application provides a flash vessel device is hit to liquid prevention, should prevent that the flash vessel device is hit to liquid refrigerant can prevent to get into the compressor through the tonifying qi mouth, leads to compressor liquid to hit and damage the compressor, improves the compressor reliability, promotes the life of compressor.

The present application provides in a first aspect a flash vessel apparatus for preventing liquid impact, comprising:

the refrigerant separator plate 1, the refrigerant input pipe 2, the refrigerant output pipe and the air supplement pipe 3;

the refrigerant partition plate 1 is arranged in the inner cavity of the flash evaporator, is fixed at the bottom of the inner cavity of the flash evaporator and divides the inner cavity of the flash evaporator into a first cavity and a second cavity;

an air supplementing port 31 of the air supplementing pipe 3 penetrates through the top of the inner cavity of the flash evaporator and is arranged in the inner cavity of the flash evaporator, and the height of the air supplementing port 31 relative to the bottom of the inner cavity of the flash evaporator is higher than that of the refrigerant partition plate 1;

the refrigerant output pipe comprises a first liquid discharge pipe 4 and a second liquid discharge pipe 5, the first liquid discharge pipe 4 and the refrigerant input pipe 2 are arranged in the first cavity, and a liquid discharge inlet 51 of the second liquid discharge pipe 5 is communicated with the second cavity;

the refrigerant outlet 41 of the first drain pipe 4 and the drain outlet 52 of the second drain pipe 5 are respectively communicated with the evaporator 104.

In one embodiment, a liquid level switch and a limit filter screen 6 are disposed in the second cavity, the limit filter screen 6 is disposed above the liquid level switch, a horizontal projection area of the limit filter screen 6 is consistent with a horizontal projection area of the bottom of the second cavity, and the liquid level switch is used for controlling the opening and closing of the liquid discharge inlet 51.

In one embodiment, the level switch is a buoyant ball switch 7;

the bottom of the second cavity is provided with a bowl-shaped groove 8, a liquid drainage inlet 51 is arranged in the bowl-shaped groove 8, and a buoyancy ball switch 7 is arranged in the bowl-shaped groove 8.

In one embodiment, a photoelectric sensor 81 is disposed on a wall of the bowl-shaped recess 8, and the photoelectric sensor 81 is used to detect whether the buoyant ball switch 7 is located in the bowl-shaped recess 8.

In one embodiment, the height of the refrigerant partition 1 is greater than 70% and less than 80% of the height of the flash evaporator cavity.

In one embodiment, the volume of the first cavity is greater than the volume of the second cavity.

In one embodiment, an expansion valve 42 and a three-way valve 43 are further disposed between the refrigerant output port 41 and the evaporator 104, the refrigerant output port 41 is communicated with an input end of the expansion valve 42, and an output end of the expansion valve 42 is communicated with a first input end 431 of the three-way valve 43;

the drain outlet 52 communicates with a second input 432 of the three-way valve 43;

the merged output terminal 433 of the three-way valve 43 communicates with the evaporator 104.

The present application provides in a second aspect an air conditioner comprising:

a compressor 101, a condenser 102, a throttle valve 103, an evaporator 104, and an anti-flash evaporator apparatus 105 as described in any one of the above;

the flash evaporator device 105 for preventing liquid impact is arranged between the throttle valve 103 and the evaporator 104;

the output end of the throttle valve 103 is communicated with a refrigerant input pipe 2 of the flash evaporator device 105 for preventing liquid impact, an air supplement pipe 3 of the flash evaporator device 105 for preventing liquid impact is communicated with the compressor 101, and a refrigerant output pipe of the flash evaporator device 105 for preventing liquid impact is communicated with the evaporator 104.

A third aspect of the present application provides a liquid-hammer prevention control method for controlling an air conditioner as described above to perform liquid-hammer prevention control, including:

acquiring the frequency of a compressor, the opening of a throttle valve and the opening of an expansion valve;

if the frequency of the compressor, the opening of the throttle valve and the opening of the expansion valve change within a first preset time, acquiring the exhaust temperature of an outdoor unit of the air conditioner, the exhaust condensing temperature and the current of the whole air conditioner;

determining liquid impact risk degrees according to the exhaust temperature of the outdoor unit, the exhaust condensing temperature and the current of the whole air conditioner, wherein the liquid impact risk degrees comprise a first degree, a second degree and a third degree;

and adjusting the frequency of the compressor, the opening of the throttle valve and the opening of the expansion valve according to the liquid impact risk degree.

In one embodiment, before determining the liquid impact risk level, the method further comprises: acquiring the opening and closing state of a liquid level switch of the flash evaporator device;

determining the liquid impact risk degree according to the outdoor unit exhaust temperature, the exhaust condensing temperature and the air conditioner complete machine current, wherein the method comprises the following steps:

if the temperature of the outdoor unit exhaust gas which is reduced in a second preset time period is greater than or equal to a first temperature threshold and less than a second temperature threshold, the temperature difference obtained by subtracting the exhaust condensation temperature from the outdoor unit exhaust gas temperature is within a first liquid impact risk range, and the current of the whole air conditioner which is increased in the second preset time period is greater than or equal to the first current threshold and less than a second current threshold, determining that the liquid impact risk degree is a first degree;

if the temperature of the outdoor unit exhaust gas which is reduced in a second preset time period is greater than or equal to a second temperature threshold and less than a third temperature threshold, the temperature difference obtained by subtracting the exhaust condensation temperature from the outdoor unit exhaust gas temperature is within a second liquid impact risk range, and the current of the whole air conditioner which is increased in the second preset time period is greater than or equal to the second current threshold and less than the third current threshold, determining that the liquid impact risk degree is a second degree;

if the temperature of the outdoor unit exhaust temperature decreased within a second preset time is greater than or equal to a third temperature threshold, the current of the whole air conditioner increased within the second preset time is greater than or equal to a third current threshold, and the opening and closing state of the liquid level switch is an opening state, determining that the liquid impact risk degree is a third degree;

the first temperature threshold, the second temperature threshold and the third temperature threshold are sequentially increased, the lower limit value of the first liquid impact risk range is larger than or equal to the upper limit value of the second liquid impact risk range, and the first current threshold, the second current threshold and the third current threshold are sequentially increased.

In one embodiment, adjusting the compressor frequency, the throttle opening, and the expansion valve opening according to the liquid slugging risk level includes:

if the liquid impact risk degree is a first degree, maintaining the frequency of the compressor unchanged, reducing the opening degree of the throttle valve by a first opening degree adjusting value, and increasing the opening degree of the expansion valve by the first opening degree adjusting value;

if the liquid impact risk degree is a second degree, reducing the frequency of the compressor by a first frequency adjustment value, reducing the opening of the throttle valve by a second opening adjustment value, and increasing the opening of the expansion valve by the second opening adjustment value;

if the liquid impact risk degree is a third degree, reducing the frequency of the compressor by a second frequency adjustment value, reducing the opening of the throttle valve by a second opening adjustment value, and adjusting the opening of the expansion valve to the maximum opening;

the first opening degree adjustment value is smaller than the second opening degree adjustment value, and the first opening degree adjustment value is larger than zero; the first frequency adjustment value is smaller than the second frequency adjustment value, and the first frequency adjustment value is larger than zero.

The technical scheme provided by the application can comprise the following beneficial effects:

the refrigerant partition plate is fixed at the bottom of the inner cavity of the flash evaporator, the inner cavity of the flash evaporator is divided into a first cavity and a second cavity, the air supplementing port of the air supplementing pipe penetrates through the top of the inner cavity of the flash evaporator and is arranged in the inner cavity of the flash evaporator, the height of the air supplementing port relative to the bottom of the inner cavity of the flash evaporator is higher than that of the refrigerant partition plate, the first drainage pipe and the refrigerant input pipe are arranged in the first cavity, so that the liquid level of the refrigerant in the first cavity cannot rise to the air supplementing port and flows into the second cavity from the first cavity, liquid refrigerant is prevented from entering the compressor through the air supplementing port, the compressor is prevented from being damaged by liquid impact of the compressor, and the reliability of the compressor is improved; the flowing back entry and the second cavity intercommunication of second fluid-discharge tube, the refrigerant delivery outlet of first fluid-discharge tube and the flowing back export of second fluid-discharge tube communicate with the evaporimeter respectively for liquid refrigerant that flows into in the second cavity from first cavity can get back to in the evaporimeter and evaporate, has avoided the refrigerant liquid level in the second cavity to appear the too high condition, prevents the compressor liquid attack, promotes the life of compressor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the application.

FIG. 1 is a schematic side sectional view of a flash vessel apparatus for preventing liquid hammer according to an embodiment of the present disclosure;

FIG. 2 is a schematic sectional front view of a flash vessel apparatus for preventing liquid hammer according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a portion of a second liquid discharge pipe of the flash evaporator apparatus for preventing liquid impact according to the embodiment of the present application;

fig. 4 is a schematic structural diagram illustrating that, in the flash evaporator apparatus for preventing liquid impact according to the embodiment of the present application, a refrigerant output port of the first liquid discharge pipe and a liquid discharge outlet of the second liquid discharge pipe are respectively communicated with the evaporator;

fig. 5 is a schematic structural view of an air conditioner according to an embodiment of the present application;

fig. 6 is a schematic flow chart of a liquid-hammer prevention control method according to an embodiment of the present application.

Detailed Description

Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application have been illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Example one

When refrigerant flow changes, the inside refrigerant that can store certain volume of flash vessel, but the storage volume is limited, in case the refrigerant liquid level is too high, liquid refrigerant can get into the compressor through the compressor tonifying qi mouth, leads to the compressor liquid to hit and damage the compressor. In the prior art, the liquid level height of a refrigerant in the flash evaporator cannot be controlled, so that the condition that the liquid refrigerant can enter the compressor through a gas supplementing port of the compressor is easily caused, the compressor is damaged by liquid impact, and the reliability of the compressor is reduced.

To above-mentioned problem, this application embodiment provides a prevent liquid and hit flash vessel device, can prevent that liquid refrigerant from getting into the compressor through the tonifying qi mouth, leads to the compressor liquid to hit and damage the compressor, improves the compressor reliability, promotes the life of compressor.

The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, an embodiment of the flash evaporator apparatus for preventing liquid impact according to the embodiment of the present application includes:

refrigerant baffle 1, refrigerant input tube 2, refrigerant output tube and air supplement pipe 3, wherein, refrigerant baffle 1 sets up in the flash vessel inner chamber, is fixed in the bottom of flash vessel inner chamber, separates the flash vessel inner chamber for first cavity and 1 second cavity. In addition, the refrigerant output pipe comprises a first liquid discharge pipe 4 and a second liquid discharge pipe 5, the first liquid discharge pipe 4 and the refrigerant input pipe 2 are arranged in the first cavity, and a liquid discharge inlet 51 of the second liquid discharge pipe 5 is communicated with the second cavity. Furthermore, the top of flash vessel inner chamber is run through to the tonifying qi mouth 31 of moisturizing pipe 3, set up in the flash vessel inner chamber, the height that the tonifying qi mouth 31 is higher than refrigerant baffle 1 for the bottom of flash vessel inner chamber, it can be understood, reduce the refrigerant volume and lead to the increase of refrigerant input pipe 2 input refrigerant volume when refrigerant circulation system, first drain pipe 4 can't in time discharge the liquid refrigerant in the first cavity and lead to the refrigerant liquid level to rise, the liquid refrigerant can cross in refrigerant baffle 1 inflow second cavity earlier, and can not directly rise to the height of tonifying qi mouth 31, prevent that liquid refrigerant from getting into compressor department from tonifying qi mouth 31, cause the compressor liquid to hit and damage the condition of compressor.

Further, the refrigerant output port 41 of the first liquid discharge pipe 4 and the liquid discharge outlet 52 of the second liquid discharge pipe 5 are respectively communicated with the evaporator 104, the refrigerant output port 41 of the first liquid discharge pipe 4 is communicated with the evaporator 104 to be regarded as a conventional refrigerant circulation pipeline of a refrigerant circulation system, and the liquid discharge outlet 52 of the second liquid discharge pipe 5 is communicated with the evaporator 104 to be regarded as a bypass flow dividing pipeline, when the first liquid discharge pipe 4 cannot discharge the liquid refrigerant in time, the liquid refrigerant entering the second cavity from the first cavity is discharged to the evaporator by the aid of the bypass flow dividing pipeline, so that the liquid level of the refrigerant in the second cavity is further prevented from rising to the gas supplementing port 13, the liquid refrigerant enters the compressor to cause liquid slugging, and the reliability of the compressor is improved.

The first embodiment above shows the following advantages:

the refrigerant partition plate is fixed at the bottom of the inner cavity of the flash evaporator, the inner cavity of the flash evaporator is divided into a first cavity and a second cavity, the air supplement port of the air supplement pipe penetrates through the top of the inner cavity of the flash evaporator and is arranged in the inner cavity of the flash evaporator, the height of the air supplement port relative to the bottom of the inner cavity of the flash evaporator is higher than that of the refrigerant partition plate, the first drainage pipe and the refrigerant input pipe are arranged in the first cavity, so that the liquid level of the refrigerant in the first cavity cannot rise to the air supplement port and flows into the second cavity from the first cavity, liquid refrigerant is prevented from entering the compressor through the air supplement port, the compressor is prevented from being damaged due to liquid impact of the compressor, and the reliability of the compressor is improved; the flowing back entry and the second cavity intercommunication of second fluid-discharge tube, the refrigerant delivery outlet of first fluid-discharge tube and the flowing back export of second fluid-discharge tube communicate with the evaporimeter respectively for liquid refrigerant that flows into in the second cavity from first cavity can get back to in the evaporimeter and evaporate, has avoided the refrigerant liquid level in the second cavity to appear the too high condition, prevents the compressor liquid attack, promotes the life of compressor.

Example two

In order to facilitate understanding, an embodiment of the flash evaporator device for preventing liquid impact is provided below for explanation, in practical application, a liquid level switch and a limiting filtering mesh enclosure are arranged in the second cavity, so that the second cavity can also store a certain amount of liquid refrigerant, the liquid refrigerant is discharged after the liquid level of the refrigerant rises to a certain height, the auxiliary effect on the refrigerant quantity control in the refrigerant circulation system is achieved, the liquid refrigerant returns to the evaporator after being filtered by the limiting filtering mesh enclosure, impurities in the liquid refrigerant can be prevented from damaging the evaporator, and the reliability of the evaporator is improved.

Referring to fig. 1, fig. 3 and fig. 4, an embodiment of the flash evaporator apparatus for preventing liquid impact according to the embodiment of the present application includes:

a liquid level switch and a limiting filter screen 6 are arranged in the second cavity, and the liquid level switch is used for controlling the opening and closing of the liquid drainage inlet 51. In this embodiment, the liquid level switch is a buoyancy ball switch 7, and the buoyancy ball switch 7 is a liquid level controller, and it can be understood that, when the refrigerant liquid level reaches a certain height, sufficient buoyancy is provided to the buoyancy ball switch 7, and the buoyancy ball switch 7 can enter an open state. The bottom of second cavity is equipped with bowl form recess 8, flowing back entry 51 sets up within bowl form recess 8, buoyancy ball switch 7 sets up in bowl form recess 8, it can be understood, bowl form recess 8's recess shape can be unanimous with buoyancy ball switch 7's appearance, provide limiting displacement for buoyancy ball switch 7, when making buoyancy ball switch 7 be within bowl form recess 8, can cover flowing back entry 51, prevent that liquid refrigerant from just discharging in the middle of evaporator 104 when not reaching the take the altitude, reach the effect of storing liquid refrigerant in the second cavity, promote refrigerant circulation system's refrigerant volume regulation and control ability. The material of the buoyancy ball switch 7 may be plastic, or other materials, and in practical application, the material may be determined according to practical application conditions, which is not limited herein.

Further, be equipped with photoelectric sensing ware 81 on bowl form recess 8's the cell wall, photoelectric sensing ware 81 is used for detecting buoyancy ball switch 7 whether is in within bowl form recess 8 for follow-up liquid hits the judgement of risk degree.

Further, the limit filter screen 6 is disposed above the liquid level switch, and a horizontal projection area of the limit filter screen 6 is consistent with a horizontal projection area of the bottom of the second cavity, so that a floating height of the buoyancy ball switch 7 can be controlled, the floating height of the buoyancy ball switch 7 can affect a speed of discharging a liquid refrigerant from the liquid discharge inlet 51 of the second liquid discharge pipe 5, and the buoyancy ball switch 7 can be prevented from floating too high to enter the first cavity, and therefore, for example, a distance between the limit filter screen 6 and the liquid discharge inlet 51 can be set to be a distance increased by 3 cm to 5 cm on the basis of a diameter of the buoyancy ball switch 7, in practical application, a distance between the limit filter screen 6 and the liquid discharge inlet 51 needs to be determined according to practical application conditions, and the distance is not limited uniquely. The limiting filter screen 6 not only plays a role in limiting the floating height of the buoyancy ball switch 7, but also can filter liquid refrigerants, so that impurities in the liquid refrigerants are prevented from damaging the evaporator, and the reliability of the evaporator is improved.

The height of the refrigerant partition plate 1 is greater than 70% of the height of the inner cavity of the flash evaporator and less than 80% of the height of the inner cavity of the flash evaporator, preferably, the height of the refrigerant partition plate 1 is 75% of the height of the inner cavity of the flash evaporator, and in practical application, the refrigerant partition plate 1 needs to be set according to practical application conditions, and is not limited herein. Refrigerant baffle 1 does not equally separate the flash vessel inner chamber in this application embodiment, because liquid refrigerant is by the 2 inputs of refrigerant input tube in the first cavity, and mainly still discharge from first drain pipe 4 in the first cavity, and the second cavity then plays the effect of bypass flow distribution pipeline, consequently, liquid refrigerant still can mainly be stored in the middle of the first cavity, the volume of first cavity needs to be greater than the volume of second cavity to satisfy the storage demand of liquid refrigerant.

As shown in fig. 4, an expansion valve 42 and a three-way valve 43 are further disposed between the refrigerant output port 41 and the evaporator 104, the refrigerant output port 41 is communicated with an input end of the expansion valve 42, an output end of the expansion valve 42 is communicated with a first input end 431 of the three-way valve 43, and the liquid discharge outlet 52 is communicated with a second input end 432 of the three-way valve 43, it can be understood that the liquid refrigerant discharged from the first liquid discharge pipe 4 is throttled by the expansion valve 42 and then enters the three-way valve 43, and the liquid refrigerant discharged from the second liquid discharge pipe 5 also enters the three-way valve 43, that is, the three-way valve 43 performs a summarizing function on two liquid refrigerants, a converging output end 433 of the three-way valve 43 is communicated with the evaporator 104, and the converged liquid refrigerant is discharged into the evaporator 104 for evaporation.

The following advantageous effects can be seen from the second embodiment:

through set up liquid level switch and spacing filtration screen panel in the second cavity for the second cavity also can save a certain amount of liquid refrigerant, rises to certain height at the refrigerant liquid level and discharges again, plays the additional action to the refrigerant volume control in the refrigerant circulation system, and the evaporator is got back to after the filtration of liquid refrigerant through spacing filtration screen panel, can prevent that the impurity in the liquid refrigerant from causing the damage to the evaporator, improves the reliability of evaporator.

EXAMPLE III

Corresponding to the embodiment of the flash evaporator device for preventing liquid impact, the application also provides an air conditioner and a corresponding embodiment.

Fig. 5 is a schematic structural diagram of an air conditioner according to an embodiment of the present application.

Referring to fig. 5, an air conditioner according to an embodiment of the present application includes:

a compressor 101, a condenser 102, a throttle valve 103, an evaporator 104, and a flash evaporator device 105 for preventing liquid impact as described in embodiment one or embodiment two;

the flash evaporator device 105 for preventing liquid impact is arranged between the throttle valve 103 and the evaporator 104;

the output end of the throttle valve 103 is communicated with a refrigerant input pipe 2 of the flash evaporator device 105 for preventing liquid impact, an air supplement pipe 3 of the flash evaporator device 105 for preventing liquid impact is communicated with the compressor 101, and a refrigerant output pipe of the flash evaporator device 105 for preventing liquid impact is communicated with the evaporator 104.

Example four

Corresponding to the embodiment of the air conditioner, the application also provides a liquid impact prevention control method and a corresponding embodiment.

Fig. 6 is a schematic flow chart of a liquid-hammer prevention control method according to an embodiment of the present application.

Referring to fig. 6, a liquid-impact prevention control method according to an embodiment of the present application includes:

401. acquiring the frequency of a compressor, the opening degree of a throttle valve and the opening degree of an expansion valve;

the acquisition mode of the compressor frequency, the throttle opening and the expansion valve opening can be called from data stored in a controller of the air conditioner, or a frequency detector can be arranged at the compressor, and opening detectors can be arranged at the throttle opening and the expansion valve opening for acquisition, and the acquisition mode needs to be determined according to practical application conditions, and is not limited herein.

402. If the frequency of the compressor, the opening of the throttle valve and the opening of the expansion valve change within a first preset time, acquiring the exhaust temperature of an outdoor unit of the air conditioner, the exhaust condensing temperature and the current of the whole air conditioner;

if the frequency of the compressor, the opening degree of the throttle valve and the opening degree of the expansion valve are changed within a first preset time, it is indicated that the quantity of the refrigerant in the refrigerant circulating system is changed, the liquid level of the refrigerant in the flash evaporator is adjusted, and therefore whether the compressor has a liquid impact risk needs to be detected, the exhaust temperature of the outdoor unit, the exhaust condensing temperature and the current of the whole air conditioner are detected.

If the outdoor unit exhaust temperature is reduced, it indicates that a liquid refrigerant exists in a cylinder of the compressor, and the liquid refrigerant evaporates at a high temperature, thereby absorbing heat of the outdoor unit exhaust gas and causing the outdoor unit exhaust temperature to be reduced. The saturation temperature corresponding to the discharge pressure is close to the temperature when the discharge gas is condensed, and under the condition that the compressor is normally operated, the discharged gas should be in an overheated state, and the discharge temperature of the outdoor unit should be higher than the saturation temperature corresponding to the discharge pressure, namely the discharge condensing temperature, namely, under the condition that the discharge temperature of the outdoor unit is lower than the discharge condensing temperature, the gas discharged by the compressor is in an overcooled state, which indicates that liquid refrigerants exist in the discharged gas.

When liquid refrigerant exists in the compressor, the compressor can perform liquid compression, the power can be improved, and therefore the current of the whole air conditioner can be influenced and increased.

The first preset time period may be set to 5 minutes, or may be set to other suitable time periods, and is not limited to the specific time period.

403. Determining the liquid impact risk degree according to the exhaust temperature of the outdoor unit, the exhaust condensing temperature and the current of the whole air conditioner;

before the liquid impact risk degree is determined, the opening and closing state of a liquid level switch of the flash evaporator device needs to be acquired so as to judge whether the amount of liquid refrigerant flowing from the first cavity to the second cavity in the flash evaporator device is enough to float the liquid level switch, namely the buoyancy ball switch, so that the amount of the liquid refrigerant stored in the flash evaporator device is predicted and judged. In the embodiment of the application, the on-off state of the buoyancy ball switch of the flash evaporator device can be obtained through the photoelectric sensor on the wall of the bowl-shaped groove in the flash evaporator device, if the buoyancy ball switch is not located in the bowl-shaped groove, the buoyancy ball switch is in the on state, and if the buoyancy ball switch is located in the bowl-shaped groove, the buoyancy ball switch is in the off state to cover the liquid discharge inlet.

In the embodiment of the application, the liquid impact risk degree comprises a first degree, a second degree and a third degree.

If the temperature of the outdoor unit exhaust temperature which is reduced in a second preset time period is greater than or equal to the first temperature threshold and less than the second temperature threshold, the temperature difference obtained by subtracting the exhaust condensing temperature from the outdoor unit exhaust temperature is within a first liquid impact risk range, and the current of the air conditioner complete machine which is increased in the second preset time period is greater than or equal to the first current threshold and less than the second current threshold, determining that the liquid impact risk degree is a first degree;

if the temperature of the outdoor unit exhaust gas which is reduced in a second preset time period is greater than or equal to a second temperature threshold and less than a third temperature threshold, the temperature difference obtained by subtracting the exhaust condensation temperature from the outdoor unit exhaust gas temperature is within a second liquid impact risk range, and the current of the whole air conditioner which is increased in the second preset time period is greater than or equal to the second current threshold and less than the third current threshold, determining that the liquid impact risk degree is a second degree;

and if the temperature of the outdoor unit exhaust temperature decreased within the second preset time is greater than or equal to a third temperature threshold, the current of the whole air conditioner increased within the second preset time is greater than or equal to a third current threshold, and the opening and closing state of the liquid level switch is an opening state, determining that the liquid impact risk degree is a third degree.

The second preset time period can be set to 30 seconds, the first temperature threshold, the second temperature threshold and the third temperature threshold are sequentially increased, preferably, the first temperature threshold can be 5 ℃, the second temperature threshold can be 10 ℃ and the third temperature threshold can be 20 ℃; the lower limit value of the first liquid impact risk range is greater than or equal to the upper limit value of the second liquid impact risk range, preferably, the first liquid impact risk range can be set to be greater than or equal to 0 ℃ and less than or equal to 3 ℃, and the second liquid impact risk range can be set to be greater than or equal to-3 ℃ and less than 0 ℃; the first current threshold, the second current threshold and the third current threshold are sequentially increased, preferably, the first current threshold may be 3A, the second current threshold may be 7A, and the third current threshold may be 15A.

It should be understood that the above values related to the first temperature threshold, the second temperature threshold, the third temperature threshold, the first fluid impact risk range, the second fluid impact risk range, the first current threshold, the second current threshold, and the third current threshold are only exemplary, and in practical applications, the values need to be set according to practical application situations, and are not limited herein.

It is also understood that a first degree may be considered a degree at which there is a risk of mild liquid slugging, a second degree may be considered a degree at which there is a risk of moderate liquid slugging, and a third degree may be considered a degree at which there is a risk of severe liquid slugging.

404. And adjusting the frequency of the compressor, the opening of the throttle valve and the opening of the expansion valve according to the liquid impact risk degree.

The frequency of the compressor can be adjusted to achieve the effect of adjusting the amount of the refrigerant in the refrigerant circulation system, the opening degree of the throttle valve can be adjusted to achieve the effect of adjusting the speed of the refrigerant entering the flash evaporator, and the opening degree of the expansion valve can be adjusted to achieve the effect of adjusting the speed of the refrigerant discharging the flash evaporator.

If the liquid impact risk degree is a first degree, maintaining the frequency of the compressor unchanged, reducing the opening degree of the throttle valve by a first opening degree adjusting value, and increasing the opening degree of the expansion valve by the first opening degree adjusting value;

if the liquid impact risk degree is a second degree, reducing the frequency of the compressor by a first frequency adjustment value, reducing the opening of the throttle valve by a second opening adjustment value, and increasing the opening of the expansion valve by the second opening adjustment value;

if the liquid impact risk degree is the third degree, the frequency of the compressor is reduced by the second frequency adjustment value, the opening of the throttle valve is reduced by the second opening adjustment value, and the opening of the expansion valve is adjusted to the maximum opening.

The first opening degree adjustment value is smaller than the second opening degree adjustment value, and the first opening degree adjustment value is larger than zero; the first frequency adjustment value is less than the second frequency adjustment value, and the first frequency adjustment value is greater than zero.

In this embodiment of the application, the first frequency adjustment value may be 5HZ, the second frequency adjustment value may be 15HZ, the first opening degree adjustment value may be set to 50 steps, and the second opening degree adjustment value may be set to 100 steps.

The following beneficial effects can be seen from the fourth embodiment:

the method comprises the steps of judging whether the refrigerant quantity in a refrigerant circulating system changes or not by judging the change conditions of the compressor frequency, the throttle opening and the expansion valve opening within a first preset time, if so, possibly causing the risk of liquid impact of the compressor due to overhigh refrigerant liquid level in a flash evaporator device, further determining the liquid impact risk degree according to the outdoor unit exhaust temperature, the exhaust condensing temperature and the air conditioner complete machine current, accurately judging the liquid impact risk degree, adjusting the compressor frequency, the throttle opening and the expansion valve opening according to the liquid impact risk degree, timely removing the risk of liquid impact of the compressor, solving the problem of overhigh refrigerant liquid level of the flash evaporator device under the condition of not needing to stop the air conditioner, improving the reliability of the compressor, improving the reliability of the air conditioner complete machine and ensuring the performance and comfort of the air conditioner.

With regard to the apparatus in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated herein.

The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required in the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.

Furthermore, the method according to the present application may also be implemented as a computer program or computer program product comprising computer program code instructions for performing some or all of the steps of the above-described method of the present application.

Alternatively, the present application may also be embodied as a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) having stored thereon executable code (or a computer program, or computer instruction code) which, when executed by a processor of an electronic device (or electronic device, server, etc.), causes the processor to perform some or all of the steps of the above-described method according to the present application.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the applications disclosed herein may be implemented as electronic hardware, computer software, or combinations of both.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (11)

1. A flash vessel device for preventing liquid impact, characterized by comprising:

the refrigerant separator (1), the refrigerant input pipe (2), the refrigerant output pipe and the air supplement pipe (3);

the refrigerant partition plate (1) is arranged in an inner cavity of the flash evaporator, is fixed at the bottom of the inner cavity of the flash evaporator and divides the inner cavity of the flash evaporator into a first cavity and a second cavity;

an air supplementing port (31) of the air supplementing pipe (3) penetrates through the top of the inner cavity of the flash evaporator and is arranged in the inner cavity of the flash evaporator, and the height of the air supplementing port (31) relative to the bottom of the inner cavity of the flash evaporator is higher than that of the refrigerant partition plate (1);

the refrigerant output pipe comprises a first liquid discharge pipe (4) and a second liquid discharge pipe (5), the first liquid discharge pipe (4) and the refrigerant input pipe (2) are arranged in the first cavity, and a liquid discharge inlet (51) of the second liquid discharge pipe (5) is communicated with the second cavity;

the refrigerant outlet (41) of the first liquid discharge pipe (4) and the liquid discharge outlet (52) of the second liquid discharge pipe (5) are respectively communicated with an evaporator (104).

2. The flash vessel apparatus for preventing liquid hammer according to claim 1,

be equipped with liquid level switch and spacing filter screen panel (6) in the second cavity, spacing filter screen panel (6) set up in liquid level switch's top, just the horizontal projection area of spacing filter screen panel (6) with the horizontal projection area of the bottom of second cavity is unanimous, liquid level switch is used for control opening and closing of flowing back entry (51).

3. The flash vessel apparatus for preventing liquid hammer according to claim 2,

the liquid level switch is a buoyancy ball switch (7);

the bottom of the second cavity is provided with a bowl-shaped groove (8), the liquid discharge inlet (51) is arranged in the bowl-shaped groove (8), and the buoyancy ball switch (7) is arranged in the bowl-shaped groove (8).

4. The flash vessel device for preventing liquid impact according to claim 3,

and a photoelectric sensor (81) is arranged on the wall of the bowl-shaped groove (8), and the photoelectric sensor (81) is used for detecting whether the buoyancy ball switch (7) is positioned in the bowl-shaped groove (8).

5. The flash vessel apparatus for preventing liquid hammer according to claim 1,

the height of the refrigerant partition plate (1) is greater than 70% of the height of the inner cavity of the flash evaporator and less than 80% of the height of the inner cavity of the flash evaporator.

6. The flash vessel apparatus for preventing liquid hammer according to claim 1,

the volume of the first cavity is larger than that of the second cavity.

7. The flash vessel apparatus for preventing liquid hammer according to claim 2,

an expansion valve (42) and a three-way valve (43) are further arranged between the refrigerant output port (41) and the evaporator (104), the refrigerant output port (41) is communicated with the input end of the expansion valve (42), and the output end of the expansion valve (42) is communicated with a first input end (431) of the three-way valve (43);

the drainage outlet (52) is in communication with a second input (432) of the three-way valve (43);

the merged output (433) of the three-way valve (43) is in communication with the evaporator (104).

8. An air conditioner, comprising:

a compressor (101), a condenser (102), a throttle valve (103) -an evaporator (104) and a flash vessel device (105) against liquid impact according to claim 7;

the flash evaporator device (105) is arranged between the throttle valve (103) and the evaporator (104);

the output end of the throttle valve (103) is communicated with a refrigerant input pipe (2) of the flash evaporator device (105) for preventing liquid impact, an air supplement pipe (3) of the flash evaporator device (105) for preventing liquid impact is communicated with the compressor (101), and a refrigerant output pipe of the flash evaporator device (105) for preventing liquid impact is communicated with the evaporator (104).

9. A liquid-hammer prevention control method for controlling the air conditioner according to claim 8 for liquid-hammer prevention control, comprising:

acquiring the frequency of a compressor, the opening degree of a throttle valve and the opening degree of an expansion valve;

if the frequency of the compressor, the opening of the throttle valve and the opening of the expansion valve change within a first preset time period, acquiring the exhaust temperature of an outdoor unit of the air conditioner, the exhaust condensing temperature and the current of the whole air conditioner;

determining liquid impact risk degrees according to the outdoor unit exhaust temperature, the exhaust condensing temperature and the air conditioner complete machine current, wherein the liquid impact risk degrees comprise a first degree, a second degree and a third degree;

and adjusting the frequency of the compressor, the opening degree of the throttle valve and the opening degree of the expansion valve according to the liquid impact risk degree.

10. The liquid-hammer prevention control method according to claim 9,

before determining the liquid impact risk degree, the method further comprises the following steps: acquiring the opening and closing state of a liquid level switch of the flash evaporator device;

determining the liquid impact risk degree according to the outdoor unit exhaust temperature, the exhaust condensing temperature and the air conditioner complete machine current, wherein the method comprises the following steps:

if the temperature of the outdoor unit exhaust temperature decreased in a second preset time period is greater than or equal to a first temperature threshold and less than a second temperature threshold, the temperature difference obtained by subtracting the exhaust condensation temperature from the outdoor unit exhaust temperature is within a first liquid impact risk range, and the current of the whole air conditioner current increased in the second preset time period is greater than or equal to a first current threshold and less than a second current threshold, determining that the liquid impact risk degree is the first degree;

if the temperature of the outdoor unit exhaust temperature which is decreased within the second preset time is greater than or equal to the second temperature threshold and less than a third temperature threshold, the temperature difference obtained by subtracting the exhaust condensing temperature from the outdoor unit exhaust temperature is within a second liquid impact risk range, and the current of the air conditioner complete machine which is increased within the second preset time is greater than or equal to the second current threshold and less than a third current threshold, determining that the liquid impact risk degree is the second degree;

if the temperature of the outdoor unit exhaust temperature decreased within the second preset time period is greater than or equal to the third temperature threshold, the current of the complete air conditioner increased within the second preset time period is greater than or equal to the third current threshold, and the opening and closing state of the liquid level switch is an opening state, determining that the liquid impact risk degree is the third degree;

the first temperature threshold, the second temperature threshold and the third temperature threshold are sequentially increased, the lower limit value of the first liquid impact risk range is larger than or equal to the upper limit value of the second liquid impact risk range, and the first current threshold, the second current threshold and the third current threshold are sequentially increased.

11. The liquid-hammer prevention control method according to claim 9,

the adjusting the compressor frequency, the throttle opening and the expansion valve opening according to the liquid impact risk degree comprises:

if the liquid impact risk degree is the first degree, maintaining the frequency of the compressor unchanged, reducing the opening degree of the throttle valve by a first opening degree adjustment value, and increasing the opening degree of the expansion valve by the first opening degree adjustment value;

if the liquid impact risk degree is the second degree, reducing the frequency of the compressor by a first frequency adjustment value, reducing the opening degree of the throttle valve by a second opening degree adjustment value, and increasing the opening degree of the expansion valve by the second opening degree adjustment value;

if the liquid impact risk degree is the third degree, reducing the frequency of the compressor by a second frequency adjustment value, reducing the opening of the throttle valve by the second opening adjustment value, and adjusting the opening of the expansion valve to the maximum opening;

the first opening degree adjustment value is smaller than the second opening degree adjustment value, and the first opening degree adjustment value is larger than zero; the first frequency adjustment value is less than the second frequency adjustment value, and the first frequency adjustment value is greater than zero.

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