阅读说明：本技术 具有双风机的组合式空调机组及其风机控制方法 (Combined air conditioning unit with double fans and fan control method thereof ) 是由 郭俊明 何伟光 徐艳妮 梅进忠 彭延君 于 2019-10-17 设计创作，主要内容包括：本发明公开了一种具有双风机的组合式空调机组及其风机控制方法。其中组合式空调机组包括：控制器,与其他各功能段顺次连接的风机管段,与所述风机管段并联的备用风机管段；所述控制器控制所述风机管段和备用风机管段当中的任意一条管段与所述其他各功能段连通并运行,并在当前运行的管段以极限风压运行到预设的极限时间时切换到另一条管段与其他各功能段连通并运行。本发明两个风机交替使用,提高了单个风机的使用寿命。(The invention discloses a combined air conditioning unit with double fans and a fan control method thereof. Wherein modular air conditioning unit includes: the controller is used for sequentially connecting the fan pipe sections with other functional sections and the standby fan pipe section connected with the fan pipe section in parallel; and the controller controls any one of the fan pipe section and the standby fan pipe section to be communicated with other functional sections and operate, and switches to the other pipe section to be communicated with other functional sections and operate when the currently operating pipe section operates to a preset limit time at a limit wind pressure. The two fans are used alternately, so that the service life of a single fan is prolonged.)

1. A combined air conditioning unit comprises a controller and fan pipe sections sequentially connected with other functional sections, and is characterized by further comprising a standby fan pipe section connected with the fan pipe sections in parallel;

and the controller controls any one of the fan pipe section and the standby fan pipe section to be communicated with other functional sections and operate, and switches to the other pipe section to be communicated with other functional sections and operate when the currently operating pipe section operates to a preset limit time at a limit wind pressure.

2. The modular air conditioning unit of claim 1, wherein the fan duct section includes at least one pre-function section, a fan section, and at least one post-function section connected in series, the pre-function section and/or the post-function section including at least one intermediate section, and a damper disposed in an intermediate section of the pre-function section and/or the post-function section.

3. The modular air conditioning unit of claim 2, wherein the last rear functional section of the fan duct section is a middle section, and an air outlet is installed at the rear end of the last rear functional section.

4. The modular air conditioning unit of claim 2, wherein the backup fan duct section includes at least one backup pre-function section, a backup fan section, and at least one backup post-function section connected in series, the backup pre-function section and/or the backup post-function section including at least one intermediate section, a backup air valve disposed in an intermediate section of the backup pre-function section and/or the backup post-function section, the first backup pre-function section communicating with any pre-function section before the air valve, the last backup post-function section communicating with any post-function section after the air valve.

5. The modular air conditioning unit of claim 4, wherein the first spare pre-function segment and the last spare post-function segment are intermediate segments.

6. The modular air conditioning unit of claim 1, wherein the other functional segments include: at least one of the middle section, the filtering section, the surface cooling section and the air mixing section.

7. The modular air conditioning unit of claim 4, wherein the pre-function, post-function, standby pre-function or standby post-function includes at least one of a filter section, a surface cooling section, and a wind mixing section.

8. The combined air conditioning unit of claim 1, wherein the value of the maximum wind pressure is obtained from a fan performance curve corresponding to the fan.

9. A fan control method of a combined air conditioning unit according to any one of claims 1 to 8, comprising:

step 1, controlling the fan pipe section or the spare fan pipe section to be communicated with other functional sections, and controlling the fan in the corresponding pipe section to operate;

step 2, detecting the wind pressure in the currently running pipe section, and starting timing when the wind pressure reaches the limit wind pressure;

and 3, returning to the step 1 to use another pipe section in a switching way when the fan operation of the currently operated pipe section reaches the preset limit time.

10. The fan control method according to claim 9, wherein the value of the limit wind pressure is obtained by:

acquiring the required air volume of a user;

inputting the required air volume and the full pressure of the fan into third-party software to obtain a fan performance curve;

adjusting the value of the full pressure of the fan to ensure that the fan performance curve is within a certain range from the normal working pressure area of the fan to the overpressure working area;

and taking the value of the adjusted full pressure of the fan as the value of the limit air pressure.

11. The modular air conditioning unit of claim 10, wherein the fan full pressure P is obtained by adding an internal pressure loss Ps obtained by the formula Ps = Ps and an external static pressure_2.5×(Q/Q_2.5)2 obtaining said Ps_2.5The pressure loss of each functional section when the wind speed of the fan is 2.5m/s, Q is the required wind quantity, Q_2.5The air quantity is the corresponding air quantity when the air speed of the fan is 2.5 m/s.

Technical Field

The present disclosure relates to a combined air conditioning unit, and more particularly, to a combined air conditioning unit having two fans and a fan control method of the combined air conditioning unit.

Background

At present, a conventional combined air conditioning unit is in a single fan form, some engineering fan motors run in a long-term high-pressure state to cause damage of the fan motors, and the fan motors are important parts in the combined air conditioning unit. If the damage is light, the replacement of important parts is heavy, and the whole machine set needs to be replaced, so that the loss is serious.

Disclosure of Invention

In order to solve the technical problem that a single fan is easy to damage when being operated in a high-pressure state for a long time in the prior art, a combined air conditioning unit with double fans and a fan control method thereof are provided.

The invention provides a combined air conditioning unit, which comprises: the controller is used for sequentially connecting the fan pipe sections with other functional sections and the standby fan pipe section connected with the fan pipe section in parallel; and the controller controls any one of the fan pipe section and the standby fan pipe section to be communicated with other functional sections and operate, and switches to the other pipe section to be communicated with other functional sections and operate when the currently operating pipe section operates to a preset limit time at a limit wind pressure.

Specifically, the fan pipe section comprises at least one front functional section, a fan section and at least one rear functional section which are sequentially connected, the front functional section and/or the rear functional section comprise at least one middle section, and an air valve is arranged in the middle section of the front functional section and/or the rear functional section.

Preferably, the last rear functional section of the fan pipe section is a middle section, and an air outlet is arranged at the rear end of the last rear functional section.

Specifically, the spare fan pipe section comprises at least one spare front function section, a spare fan section and at least one spare rear function section which are sequentially connected, the spare front function section and/or the spare rear function section comprise at least one middle section and a spare air valve arranged in the middle section of the spare front function section and/or the spare rear function section, the first spare front function section is communicated with any front function section in front of the air valve, and the last spare rear function section is communicated with any rear function section behind the air valve.

Preferably, the first spare pre-functional section and the last spare post-functional section are intermediate sections.

Specifically, the other functional segments include: at least one of the middle section, the filtering section, the surface cooling section and the air mixing section.

Specifically, the front functional section, the rear functional section, the standby front functional section or the standby rear functional section comprises at least one of a filtering section, a surface cooling section and a wind mixing section.

Specifically, the value of the limit air pressure is obtained through a fan performance curve corresponding to the fan.

The fan control method of the combined air conditioning unit in the technical scheme of the invention comprises the following steps:

step 1, controlling the fan pipe section or the spare fan pipe section to be communicated with other functional sections, and controlling the fan in the corresponding pipe section to operate;

step 2, detecting the wind pressure in the currently running pipe section, and starting timing when the wind pressure reaches the limit wind pressure;

and 3, returning to the step 1 to use another pipe section in a switching way when the fan operation of the currently operated pipe section reaches the preset limit time.

Specifically, the value of the limit wind pressure is obtained through the following steps:

acquiring the required air volume of a user;

inputting the required air volume and the full pressure of the fan into third-party software to obtain a fan performance curve;

adjusting the value of the full pressure of the fan to ensure that the fan performance curve is within a certain range from the normal working pressure area of the fan to the overpressure working area;

and taking the value of the adjusted full pressure of the fan as the value of the limit air pressure.

Specifically, the full pressure P of the fan is obtained by adding an internal pressure loss and an external static pressure, and the internal pressure loss Ps is obtained by a formula Ps = Ps_2.5×(Q/Q_2.5)2 obtaining said Ps_2.5The pressure loss of each functional section when the wind speed of the fan is 2.5m/s, Q is the required wind quantity, Q_2.5The air quantity is the corresponding air quantity when the air speed of the fan is 2.5 m/s.

The two fans are controlled to switch and operate through the limit air pressure and the limit time, the structure of the original functional section is not required to be changed, only a spare fan pipe section is required to be added on the basis of the original functional section, the two fans operate alternately, a certain buffering effect can be achieved on a single fan, the burden of the original fan is reduced, and the service life of the fan is prolonged.

Drawings

The invention is described in detail below with reference to examples and figures, in which:

fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a control flow diagram of the present invention.

FIG. 3 is a graphical representation of a fan performance curve of the present invention.

Detailed Description

The principles and embodiments of the present invention are described in detail below with reference to the accompanying drawings.

The combined air conditioning unit comprises a controller (not shown in the figure), a fan pipe section 1 and a standby fan pipe section 2 which are connected in parallel, and other function sections which are connected in front of and/or behind the fan pipe section 1 in sequence, when the combined air conditioning unit is used, the controller controls any one of the fan pipe section 1 and the standby fan pipe section 2 to be communicated with other function sections and operate, the other unused pipe section is closed, when the currently operated pipe section operates to a preset limit time with limit wind pressure, the controller controls the currently operated pipe section to be closed again, the currently operated pipe section is switched to the other pipe section, the other pipe section is communicated with other function sections and operates, the controller switches the fan pipe section and the standby fan pipe section according to the limit wind pressure and the limit time, so that the fan of each pipe section can have enough operation time and enough rest time, thereby prolonging the service life of the fan.

When the fan pipe section 1 is specifically designed, the structure of the fan pipe section comprises at least one front functional section 12, a fan section 11 and at least one rear functional section 13 which are sequentially connected, in order to install an air valve, the front functional section and/or the rear functional section comprise at least one middle section, the air valve is installed through a middle section of the front functional section and/or the rear functional section, in a preferred embodiment, the front functional section is provided with a middle section, the rear functional section is provided with a middle section, the two middle sections are respectively provided with the air valve, furthermore, the last rear functional section of the fan pipe section can be set as the middle section, and the rear end of the last rear functional section is provided with an air outlet 3.

Similarly, the spare fan pipe section 2 comprises at least one spare pre-functional section 22, a spare fan section 21 and at least one spare post-functional section 23 which are connected in sequence, the spare pre-functional section and/or the spare post-functional section comprise at least one middle section, a spare air valve is installed in one middle section of the spare pre-functional section and/or the spare post-functional section, in a preferred embodiment, a middle section is arranged in the spare pre-functional section, a middle section is arranged in the spare post-functional section, the two middle sections are respectively provided with the spare air valve, the first spare pre-functional section is communicated with any pre-functional section before the air valve of the fan pipe section, and the last spare post-functional section is communicated with any post-functional section after the air valve of the fan pipe section. Specifically, the first standby front-end function section and the last standby rear-end function section of the standby fan pipe section can be set as middle sections.

The other functional sections disposed before or after the fan section and the standby fan section may include at least one of a middle section, a filtering section, a surface cooling section, and a wind mixing section. Similarly, the pre-functional section, the post-functional section, the standby pre-functional section or the standby post-functional section comprises at least one of a filtering section, a surface cooling section and a wind mixing section.

Fig. 1 shows a schematic structural view of the simplest embodiment of the invention. Other functional segments are respectively a middle segment 5, a filtering segment 6 and a surface cooling segment 7 which are sequentially connected and provided with an air inlet 4 at the front end, a fan segment and a middle segment are sequentially connected, the middle segment in front of the fan segment is connected with the surface cooling segment, an air outlet is arranged at the rear end of the middle segment behind the fan segment, and air valves are arranged on one sides, close to the fan segment, of the two middle segments of the fan segment (in other embodiments, only one air valve can be arranged, and the effect is relatively poor). The spare fan pipeline section comprises a middle section, a spare fan section and a middle section which are sequentially connected, the middle section before the spare fan section is communicated with the middle section at the front end of the fan pipeline section, and the middle section after the spare fan section is communicated with the middle section at the rear end of the fan pipeline section. And the standby air valves are arranged on the two middle sections of the standby fan pipe section at the sides close to the fan pipe section (in other embodiments, only one air valve can be optionally arranged, and the effect is relatively poor). The air valves or the standby air valves are controlled by the electric switches in one-to-one correspondence, and the controllers control the corresponding air valves to be opened or closed by controlling the corresponding electric switches.

As shown in fig. 2, when the controller controls the fan, the controller controls the fan pipe section or the spare fan pipe section to be communicated with other functional sections, and controls the fan in the corresponding pipe section to operate; detecting the wind pressure in a currently running pipe section, and starting timing when the wind pressure reaches the limit wind pressure; and when the fan operation of the currently operated pipe section reaches the preset limit time, returning to the initial step to switch to use another pipe section.

The limit time of the invention can take the time value of less than or equal to 986 hours as the value of the limit time according to experimental data.

As shown in fig. 3, in order to obtain the limit wind pressure, the required wind volume of the user needs to be obtained, the required wind volume and the full pressure of the fan are input into third-party software to obtain a fan performance curve, and then the value of the full pressure of the fan is adjusted to enable the fan performance curve to be within a certain range from a normal working pressure area (without a background color part) of the fan to an overpressure working area (a gray part); and then, taking the value of the adjusted full pressure of the fan as the value of the limit wind pressure (the wind pressure value of the point where 3 relatively thick straight lines intersect is approximately in the vicinity of 896Pt in the figure). In one embodiment, third party software that may be employed includes Yilida fan selection type software.

The performance of the fan is mainly determined by the required air quantity and the full pressure. The required air volume can be given by a design team according to the use occasion and the specific requirement of the client. We need to determine the full fan pressure. The combined air conditioning unit currently has a plurality of modes for determining the full pressure of the fan. Because the combined air conditioner unit combines all the functional sections together, the resistance of all the functional sections is different. Taking a common method as an example, the resistance values of the function sections are defaulted, and the resistance values are added according to the selected function section. For example, the resistance value of the default air inlet section is 5Pa, the resistance value of the primary filter section is 150Pa, and the resistance value of the meter cold section is 200 Pa. However, the method has the defects of inaccurate value taking and incapability of embodying the accurate requirement of the fan on the resistance. In order to solve the technical problem, the invention firstly adopts the change of the wind speed to determine the change of the resistance value of each section. Firstly, setting a default initial value as 2.5m/s wind speed corresponding to the pressure of each functional segment as a reference, wherein the wind speed is a national standard default wind speed, (in the actual operation process, the wind speed may have a certain error, such as 2.3m/s, 2.4m/s, etc., and therefore the default initial value may also be regarded as a default initial value with a certain error). And measuring the resistance value of each functional section through a large number of experiments at the wind speed corresponding to the default initial value. Because the air volume of the combined air conditioning unit is different, the functional sections are different, and the actual wind speed is different due to different sizes. Then if the actual wind speed is not 2.5m/s, the internal pressure loss Ps of each functional segment is calculated according to the following formula, by which Ps = Ps_2.5×(Q/Q_2.5)²Obtaining in the formula, Ps_2.5Namely, the pressure loss of each functional section passing the wind speed of 2.5m/s can be measured through experiments, Q is the required wind quantity, Q_2.5The corresponding wind quantity when the wind speed of the fan is 2.5m/s, Q corresponding to each functional section and Q_2.5Are all the same. The total pressure of the fan is the internal pressure loss of all functional sections plus the external static pressure (external excess pressure). While the overboard static pressure (overboard residual pressure) is provided by the design team.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.