JP4170069B2 - Air conditioner and air conditioner strainer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner and an air conditioner strainer installed in various buildings such as office buildings and hotels.
[0002]
[Prior art]
Air conditioners for various buildings such as office buildings and hotels are equipped with heat exchangers such as fan coils in various places such as rooms, and water that is heated or cooled by heat source devices such as boilers and refrigerators is used for water transport. These pumps are sent to each heat exchanger through a pipe line, and hot air and cold air generated by heat exchange by the heat exchanger are discharged to each chamber and the like.
[0003]
While water flows for a long time, rust is generated on the inner surface of the pipeline, and the rust is peeled off from the inner surface of the pipeline and mixed into the water. Rust such as iron scrap not only clogs the pipeline, but also damages the heat exchangers in the pipeline, valve seats of various valves, etc., causing these failures, and also shortening their service life. .
[0004]
For this reason, a strainer is often provided in the pipeline. The strainer has a built-in dust removing body made of a porous cylinder such as a wire mesh. The dust removing body filters and collects rust and circulates the filtered clear water to the pipe.
[0005]
Since rust gradually adheres to the dust remover over a long period of time, the pressure loss increases and the flow rate gradually decreases, so the dust remover must be cleaned appropriately. Conventionally, cleaning of a dust remover has been performed as follows. That is, after stopping the operation of the water transport pump, the strainer lid is opened to take out the dust remover built in the strainer, and the dust remover is cleaned with a cleaning tool such as a brush or cloth. Next, the dust remover is returned to the strainer and covered, and the operation of the water transport pump is resumed.
[0006]
[Problems to be solved by the invention]
However, the conventional air conditioner has the following problems. The first problem is that the operation of the water transport pump must be stopped during cleaning. For this reason, the cleaning execution season is almost limited to spring and autumn, where almost no air heat exchange is required and the pump for water conveyance can be relatively stopped, and it is difficult to perform in the summer and winter cooling and heating seasons. .
[0007]
The second problem is that it is difficult to perform the work of putting the dust removing body in and out of the strainer for cleaning. In other words, the strainer removes rusts with relatively large specific gravity by sinking downward by gravity, so it has a structure that hangs down from the lower pipe line near the floor surface, and cleans the dust remover. When doing so, it is structured to pull it out below the strainer. For this reason, the floor surface adjacent to the strainer becomes an obstacle, and it is difficult to perform the work of putting the dust removing body into and out of the strainer.
[0008]
In addition, as a conventional air conditioner, by providing two pipe lines provided with a strainer in parallel, when cleaning one strainer, the pipe line provided with the one strainer is closed and the other strainer is It is also known that the strainer can be cleaned by flowing water through the provided pipe line without stopping the operation of the air conditioner. However, since this type of system has two strainers, the equipment cost increases considerably, and the second problem described above cannot be solved.
[0009]
In addition, a heat exchanger that backwashes and passes backwash water through a strainer has been proposed (for example, Patent Document 1), but this also cannot be expected to have a strainer cleaning effect, and a piping structure for backwashing. There was a problem that became complicated.
[0010]
[Patent Document 1]
JP-A-8-166198 [0011]
Accordingly, the present invention solves the above-mentioned conventional problems, and provides an air conditioner and an air conditioner strainer that can easily and advantageously remove dust such as rust in a water stream and clean a dust removing body incorporated in the strainer. The purpose is to provide.
[0012]
[Means for Solving the Problems]
The present invention is an air conditioner in which water is circulated by a pump to a pipe line including a heat source device and a heat exchanger, and one end portion is connected to a pipe line downstream of the pump and the other end portion is more than the pump. A sub-line connected to the upstream line is provided so that water is circulated in parallel through the pipe and the sub-line by the pump, and a strainer having a dust removing body built in the sub-line is provided. And opening / closing means for opening and closing the sub pipe line are provided on the upstream side and the downstream side of the strainer, respectively , and the water passage area of the sub pipe line is smaller than the water passage area of the pipe line provided with the pump. and,
The cleaning of the dust removing body is carried out by removing the dust removing body from the strainer by closing the opening / closing means and stopping the flow of water to the sub-pipe while driving the pump and maintaining the air conditioning operation. To do .
[0013]
The present invention is also a strainer device for air conditioning provided in an air conditioner that circulates water by a pump through a pipe line including a heat source device and a heat exchanger, and has a water passage area smaller than the pipe line provided with the pump. A sub-pipe, a strainer provided in the sub-pipe and including a dust removing body, and opening / closing means for opening and closing the sub-pipe are provided on the upstream side and the downstream side of the strainer, respectively , and one end of the sub-pipe Is connected to a pipe line downstream of the pump, and the other end of the sub pipe line is connected to a pipe line upstream of the pump, and the pump and the sub pipe line are connected in parallel by the pump. to so that water circulation, cleaning of the dust body, said pump is stopped to close the opening and closing means while maintaining the air conditioning operation by driving the water flows into the sub conduit, said dust Body stray From taken out to run.
[0014]
In the above-described configuration, water always flows not only in the pipe line including the heat source device and the heat exchanger but also in the sub pipe line by driving the pump, and rust mixed in this water is captured by the strainer. Since the water flow area of the sub-pipe is small, only a relatively small amount of water flows through the sub-pipe, but since water circulates repeatedly through the pipe, virtually all of the water will remain considerably in the long term. In this case, substantially all of the rust in the water is trapped by the strainer dust remover. Therefore, the dust removing body is cleaned. In this case, the opening / closing means is closed to stop the flow of water to the sub pipe, and then the dust removing body is taken out of the strainer and cleaned. The pump is driven even during this cleaning, and the water for air conditioning is circulated through the pipe line including the heat source device and the heat exchanger. Therefore, the dust remover can be cleaned without stopping the operation of the air conditioner.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall configuration diagram of an air conditioner according to an embodiment of the present invention, and FIG.
[0016]
In FIG. 1, a pump 2 for water conveyance and a heat source device 3 are provided at a location along the floor surface F of the first pipeline 1 that is the lowest pipeline. As the heat source device 3, the heating means such as a boiler for heating water and the refrigeration means for cooling the water may be integrated or separate.
[0017]
The downstream side of the first pipeline 1 is connected to the water supply side header 4, and the upstream side is connected to the return water side header 5. A plurality of second pipelines 6 ₁ , 6 ₂ , 6 ₃ ... Are connected to the water supply side header 4, and a plurality of third pipelines 7 ₁ , 7 are also connected to the return water side header 5. ₂ , 7 ₃ ... Are connected. A load side coil 8 as a heat exchanger is connected to the second pipes 6 ₁ , 6 ₂ , 6 ₃ ... And the third pipes 7 ₁ , 7 ₂ , 7 ₃ . There are a plurality of load-side coils 8, and they are installed at various locations in a building such as a machine room of an office building or a hotel room. In the figure, the arrow indicates the direction of water flowing through the pipeline by driving the pump 2.
[0018]
A strainer device 10 is provided in the first pipeline 1. In the strainer device 10, a strainer 20 is disposed in a sub-pipe 11 that is piped in parallel with the first pipe 1 provided with the pump 2 and the heat source device 3, and the sub-pipe is provided downstream and upstream of the strainer 20. A first opening / closing means 13 and a second opening / closing means 14 for opening and closing the path 11 are provided. A manual valve or the like is applied to the first opening / closing means 13 and the second opening / closing means 14.
[0019]
The sub pipe 11 is provided with a first pressure gauge 15 that measures the water pressure on the upstream side of the strainer 20 and a second pressure gauge 16 that measures the water pressure on the downstream side of the strainer 20. One end portion of the sub pipe line 11 is connected to the downstream side of the pump 2 of the first pipe line 1 via the joint part 17, and the other end part of the sub pipe line 11 is connected via the joint part 18. The first pipe 1 is connected upstream of the pump 2.
[0020]
The cross-sectional area (water passage area) of the sub pipe line 11 is considerably smaller than the cross-sectional area (water passage area) of the first pipe line 1. Desirably, the cross-sectional area of the former is about 1/5 to 1/20 of the latter, and more desirably about 1/10. This is because the flow rate of the sub-pipe 11 is reduced and the capacity of the pump 2 is reduced within a range in which the intended dust removal purpose is achieved, as will be described later.
[0021]
FIG. 2 is a cross-sectional view of the vicinity of the strainer. The strainer 20 is a known type called a Y-type strainer, and will be briefly described below. Reference numeral 21 denotes a pipe body having flanges 30 at both ends, and is detachably connected to a flange 31 of the sub pipe line 11 by a stopper 32 such as a bolt and nut. Reference numeral 22 denotes an outer cylinder that protrudes downwardly from the tube body 21, and a dust removing body 23 is built therein. The dust removing body 23 is a porous cylindrical body having water permeability such as a mesh plate or a porous plate. A lid 24 is detachably attached to the lower end portion of the outer cylinder 22 by screwing means or the like, and by removing the lid 24, the dust removing body 23 can be pulled out from the strainer 20.
[0022]
The water in the sub duct 11 flows into the inside from the upper end opening 25 of the dust removing body 23 as shown by the arrow, and flows out from the trunk surface of the dust removing body 23 to the downstream side. The dust (rust) in the water that has flowed into the dust removing body 23 adheres to the inner surface by the filtering action of the dust removing body 23, or because the specific gravity of the rust is large, it settles to the lower part in the dust removing body 23 and is removed. . Then, the clarified water from which rust has been captured and removed flows out downstream of the dust removing body 23.
[0023]
This air conditioner is configured as described above, and the overall operation will be described next. In FIG. 1, when the pump 2 for water conveyance drives, the water of the 1st pipe line 1 is sent to the heat-source apparatus 3, and is heated or cooled. The heated or cooled water is sent from the water supply side header 4 to the load side coil 8 through the second pipelines 6 ₁ , 6 ₂ , 6 ₃ . The load side coil 8 heats or cools the air by its heat exchange action, and discharges it into the room or the like. The water that has passed through the load side coil 8 circulates from the third pipelines 7 ₁ , 7 ₂ , 7 ₃ ... Through the return water side header 5 to the first pipeline 1, and the water circulation described above is performed. Repeated.
[0024]
Now, the first opening / closing means 13 and the second opening / closing means 14 of the sub pipeline 11 are always open. Therefore , the water flows in parallel through the first pipe line 1 and the sub pipe line 11 by driving the pump 2. Here, assuming that the flow rate discharged from the pump 2 is Q1, the flow rate flowing through the sub pipe 11 is Q2, and the flow rate flowing through the heat source device 3 to each load side coil 8 is Q3, Q1 = Q2 + Q3. Since the water flow area of the sub-pipe 11 is considerably smaller than the water flow area of the first pipe 1, Q 2 is considerably smaller than Q 1 and Q 3, and the sub-pipe 11 is considerably smaller than the first pipe 1. A small amount of water flows. As described with reference to FIG. 2, dust (rust) in the water flow is removed by the dust removing body 23.
[0025]
The reason why the flow rate Q2 flowing through the sub-pipe 11 is less than the flow rate Q1 discharged by the pump 2 and the flow rate Q3 flowing through the heat source device 3 is as follows. That is, the dust removal effect by the strainer 20 increases as the flow rate Q2 of the sub pipe line 11 increases. On the other hand, the flow rate Q3 flowing to the heat source device 3 needs a target amount (design amount) in order to cause each load side coil 8 to perform a required heat exchange action. Therefore, if the flow rate Q2 flowing through the sub pipe line 11 is increased, the flow rate Q1 must be increased, and the pump 2 is required to have a large capacity. As a result, the pump 2 is increased in size and cost performance is lowered. On the other hand, since the water flow area of the sub pipeline 11 is small, only a relatively small amount of water flows. However, since water repeatedly circulates in the pipeline including the first pipeline 1 and the sub pipeline 11, In the meantime, substantially all of the water will flow through the sub-line 11 at least once (actually a significant number of times), and substantially all of the rust in the water will be trapped by the strainer 20. Therefore, even if the water flow area of the sub pipe line 11 is reduced and the flow rate Q2 is reduced, the intended dust removal purpose can be achieved. Therefore, what is necessary is just to apply the pump 2 of the capacity | capacitance comparable as the past or a little larger than this to this air conditioner.
[0026]
During operation for a long period of time, a large amount of rust adheres to the dust removing body 23 and becomes clogged, and its dust removing capability is reduced. Therefore, the dust removing body 23 must be cleaned. In this case, the first opening / closing means 13 and the second opening / closing means 14 are closed to stop the flow of water to the sub-pipe 11, and the lid 24 is opened to take out the dust removing body 23 from the strainer 20 and clean it. I do. In the meantime, the pump 2 is driving, and water flows to the heat source device 3 and each load side coil 8, and normal air-conditioning operation is maintained. Therefore, according to the present air conditioner, the dust removing body 23 can be cleaned without stopping the air conditioning operation.
[0027]
Further, by providing the first pressure gauge 15 and the second pressure gauge 16, if the former measurement value P1 is higher than the latter measurement value P2, for example, by a predetermined threshold value or more, the dust removing body 23 is provided. Therefore, the dust removal body 23 may be cleaned by determining that the clogging is progressing considerably. That is, the first pressure gauge 15 and the second pressure gauge 16 are determination means for determining whether or not to clean the dust removing body 23. If P1 is higher than P2 by a predetermined value (threshold value) or more, the notification means such as an indicator lamp is driven to notify the administrator that the cleaning execution time of the dust removing body 23 has arrived. Good.
[0028]
The advantage of this strainer device 10 is that it can be retrofitted to an existing air conditioner. That is, many existing air conditioners do not include a strainer device, but the strainer device 10 can be easily retrofitted to such an existing air conditioner. In addition, as described above, the pump may have a capacity similar to that of the conventional pump. Therefore, even if it is retrofitted, it is not necessary to replace the pump with a large capacity, which is extremely advantageous in terms of construction and cost.
[0029]
Post-installation is performed, for example, by the following method. First, the operation of the air conditioner is stopped, the existing first pipe is drilled, the joint portions 17 and 18 are mounted at the drilled locations, and the strainer device 10 is disposed. Secondly, water inside the first pipe is locally frozen by a freezing means such as liquefied nitrogen, and the joints 17 and 18 are drilled in the first pipe at the frozen position. The strainer device 10 is disposed by mounting. Thus, various construction methods are possible for retrofitting the strainer device 10.
[0030]
The advantage of the strainer device 10 is that the dust removing body 23 can be easily taken out from the strainer 20. That is, since water is forcibly circulated through the sub-pipe 11 by the pump 2, the sub-pipe 11 is located above the first pipe 1 (that is, a position where a sufficient distance D (FIG. 1) is secured from the floor surface F). Can be provided. Therefore, the floor surface F does not become an obstacle to the operation of pulling out the dust remover 23 from the strainer 20, and the dust remover 23 can be easily put in and out of the strainer 20 without worrying about the floor surface F. . Incidentally, in the past, the strainer device was generally provided between the pump 2 and the heat source device 3 of the first pipe 1 at the lowest stage where the possibility of sedimentation of rust having a large specific gravity was the highest. It is. However, since this position is close to the floor surface F, the floor surface F has become an obstacle, and it has been difficult to carry out the operation of putting in and out the dust removing body with respect to the strainer. However, the installation position of the strainer device of the present invention is not limited to the present embodiment, and it is not prohibited to install the strainer device at a position where it is difficult to remove and remove the dust remover near the floor as in the conventional case. .
[0031]
【The invention's effect】
As described above, according to the present invention, the rust in the water can be captured and removed by the strainer in parallel with the normal operation of the air conditioner. In particular, by making the water flow area of the sub-pipe line smaller than the water flow area of the pipe line provided with the pump, normal operation of the air conditioner can be performed using a pump having the same or substantially the same capacity as the conventional one. While performing, the strainer can capture and remove rust in the water. Further, since the strainer of the sub pipe line can be provided at a position where a sufficient distance is secured from the floor surface, the removal of the dust removing body with respect to the strainer can be easily performed without worrying about the floor surface. The strainer device of the present invention can be easily retrofitted to an existing air conditioner. In addition, in this case, since the pump having the same capacity as the conventional one may be installed, it is not necessary to replace the pump with a large capacity even if it is retrofitted, which is extremely advantageous in terms of construction and cost.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an air conditioner according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the vicinity of a strainer of a sub-pipe according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 1st pipe line 2 Pump 3 Heat source apparatus 4 Water supply side header 5 Return water side header 6 ₁ , 6 ₂ , 6 ₃ 2nd pipe line 7 ₁ , 7 ₂ , 7 ₃ 3rd pipe line 8 Load side coil (Heat exchanger)
DESCRIPTION OF SYMBOLS 10 Strainer apparatus 11 Sub pipe line 13 1st opening / closing means 14 2nd opening / closing means 15 1st pressure gauge 16 2nd pressure gauge 20 Strainer 23 Dust removal body

Claims (6)

An air conditioner that circulates water through a pipe including a heat source device and a heat exchanger by a pump, one end of which is connected to a pipe downstream of the pump, and the other end is a pipe upstream of the pump. A sub-pipe connected to the sub-pipe and allowing the water to circulate in parallel through the pipe and the sub-pipe by the pump, and providing a strainer with a dust removing body built in the sub-pipe, Opening and closing means for opening and closing the sub pipe line are provided on the upstream side and the downstream side of the strainer, respectively, and the water passage area of the sub pipe line is made smaller than the water passage area of the pipe line provided with the pump,
The cleaning of the dust removing body is carried out by removing the dust removing body from the strainer by closing the opening / closing means and stopping the flow of water to the sub-pipe while driving the pump and maintaining the air conditioning operation. An air conditioner characterized by that. The water flow area of the sub-pipe air conditioning apparatus according to claim 1, wherein a is in the range of 1/5 to 1/20 of the water flow area of the conduit in which the pump is provided.   A first pressure gauge is provided upstream of the strainer, and a second pressure gauge is provided downstream of the strainer. The measured value of the first pressure gauge is greater than the measured value of the second pressure gauge. 3. The air conditioning according to claim 1, wherein if it becomes higher than a predetermined threshold value, it is determined that clogging of the dust removing body is in progress and the cleaning is executed. 4. apparatus. A strainer device for air conditioning provided in an air conditioner that circulates water by a pump to a pipeline including a heat source device and a heat exchanger, and a sub pipeline having a smaller water flow area than the pipeline provided with the pump, A strainer provided in the sub-pipe and incorporating a dust removing body, and opening / closing means for opening and closing the sub-pipe are provided on the upstream side and the downstream side of the strainer, respectively, and one end of the sub-pipe is provided at the end of the sub-pipe. The other end of the sub pipe is connected to a pipe upstream of the pump, and water is circulated in parallel to the pipe and the sub pipe by the pump. West,
The cleaning of the dust removing body is carried out by removing the dust removing body from the strainer by closing the opening / closing means and stopping the flow of water to the sub-pipe while driving the pump and maintaining the air conditioning operation. A strainer device for air conditioning, characterized in that: The strainer device for air conditioning according to claim 4, wherein the water passage area of the sub pipe line is in the range of 1/5 to 1/20 of the water passage area of the pipe line provided with the pump.   A first pressure gauge is provided upstream of the strainer, and a second pressure gauge is provided downstream of the strainer. The measured value of the first pressure gauge is greater than the measured value of the second pressure gauge. 6. The air conditioner according to claim 4, wherein if it becomes higher than a predetermined threshold value, it is determined that clogging of the dust removing body is in progress and the cleaning is executed. Strainer device.

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