JP3950835B2 - Filter cleaning mechanism in groundwater circulation system - Google Patents

Description

  The present invention relates to a filter cleaning mechanism in a groundwater circulation system in which, for example, groundwater is pumped and used as a heat source such as air conditioning or hot water supply and then returned to the ground again.

  Since geothermal heat maintains a constant temperature throughout the year, it is cooler than the outside air in summer and hot in winter. Groundwater, which is such a geothermal holding medium, can be found anywhere in the country, and it can be easily and inexpensively recovered by pumping it from a shallow well.

  For this reason, the present applicant, for example, as disclosed in Patent Document 1 and Patent Document 2, after pumping up groundwater with a pump, and using the geothermal heat possessed by this groundwater for air conditioning and hot water supply through a heat pump , We have proposed a system that returns to the basement again.

  By effectively using groundwater in this way, it is possible to increase energy consumption efficiency and reduce power consumption associated with air conditioning and hot water supply operations while maintaining comfort. This leads to the reduction of fossil energy consumption and the accompanying carbon dioxide emissions, and contributes to the protection of the global environment.

JP 2002-54856 A JP 2002-54857 A

  When pumping up groundwater using a pump, there is a risk that sand or other solid matter mixed into the groundwater will enter the pump, causing problems such as wear and shortening the pump life. In addition, depending on the type of the pump, the pump may break down, making it impossible to pump up groundwater. For this reason, generally, a filter is installed on the upstream side of the pump, thereby preventing solids such as sand from entering the pump.

  However, when solid matter is removed with a filter, as the solid matter deposits on the filter, the filter becomes clogged, which not only increases the power consumption of the pump, but also reduces the amount of groundwater pumped. As a result, the heat exchange efficiency of the heat pump is lowered, and as a result, the energy consumption efficiency is lowered. Eventually, pumping becomes impossible and the system stops.

  For this reason, it is necessary to clean the filter. Conventionally, the pump is stopped and the filter is removed one by one for cleaning. Especially when a lot of solid matter is mixed in the groundwater, the above-mentioned cleaning work is required. It was necessary to carry out frequently, and imposing a great effort on the user.

  Therefore, the present invention aims to provide a filter cleaning mechanism that can easily and reliably perform cleaning of a filter provided in the circulation circuit in a system that circulates and uses groundwater by solving the above-described problems. And

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a circulation circuit that returns groundwater pumped from one well to the ground by operating a pumping pump. A filter cleaning mechanism in a groundwater circulation system in which a filter to be removed is provided, the pressurizing means for pressurizing the pumped-up groundwater, and the backside of the solid matter adhesion surface of the filter Main cleaning means that flows from the main cleaning means, and after the cleaning by the main cleaning means, the circulation circuit is opened to take in outside air, and ground water in the circulation circuit is caused to flow from the back side of the solid matter adhering surface of the filter by gravity drop, and The ground water used for cleaning by the main cleaning means and the auxiliary cleaning means is discharged out of the circulation circuit together with the solid matter adhering to the filter. Characterized in that a discharge means for.

  In the invention according to claim 2, the circulation circuit includes a first groundwater flow path for returning groundwater pumped from the first well to the ground from the second well by the operation of the pump, and the first by the operation of the pump. A second groundwater flow path for returning groundwater pumped from two wells to the ground from the first well, and the filter removes solids contained in the groundwater pumped from both the first and second wells It is supposed to be.

In the invention which concerns on Claim 3 , the control means which controls the action | operation of the said pumping pump, a main washing | cleaning means, an auxiliary | assistant washing | cleaning means, and a discharge means, and performs the said filter automatically is provided.

The invention according to claim 4 is provided with a heat pump for using the pumped-up groundwater as various heat sources such as air conditioning and hot water supply in the circulation circuit.

  According to the present invention, the filter provided in the circulation circuit of the groundwater circulation system can be automatically and easily removed without stopping the pump and removing the filter one by one. Can be reduced.

  In particular, when cleaning the filter, the groundwater pumped up is pressurized and allowed to flow from the back side of the solid matter adhering surface of the filter. The adhering solid matter can be reliably removed and discharged out of the circulation circuit, and a high cleaning ability can be exhibited.

  In addition, by pumping up the groundwater by exchanging the well on the pumping side and the well on the reduction side, the rust and solids in the well on the reduction side can be pumped together with the groundwater and removed with a filter. By discharging the deposited rust and solid matter to the outside of the circulation circuit by cleaning the filter, it is possible to prevent the reduction ability from being reduced.

(First embodiment)
FIG. 1 shows a circuit configuration of a groundwater circulation system according to the first embodiment of the present invention. In the figure, (1) is a first well for pumping, (2) is a second well for reduction, and these first well (1) and second well (2) are grounded by, for example, a driving method. It is a shallow well with a depth of 10m or less.

  The first well (1) and the second well (2) are connected by a circulation circuit (3). The circulation circuit (3) includes a first insertion line (5) inserted into the first well (1), a second insertion line (6) inserted into the second well (2), and the first It is comprised from the main pipe line (7) which connects an insertion pipe line (5) and a 2nd insertion pipe line (6). The main pipe (7) includes a check valve (10) for preventing a reverse flow of groundwater to the first well (1) in order from the side closer to the first insertion pipe (5), that is, the upstream side. A filter (11) for removing solid substances such as sand, a first pressure switch (12) for detecting the suction pressure of the pump (13), a pump (13), and a heat pump (14) are provided. .

  In the circulation circuit (3) configured in this way, the groundwater is pumped from the first well (1) by the operation of the pump (13), and the groundwater is passed through the filter (11) to remove solids such as sand. And after using this groundwater as various heat sources, such as air conditioning and hot water supply, in a heat pump (14), it returns to the underground from the 2nd well (2).

  On the other hand, a drainage pipe (15) extending vertically downward is connected between the check valve (10) and the filter (11) in the main pipe (7), and this drainage pipe (15) It is opened and closed by an electromagnetic or electric first on-off valve (16).

  Further, a bypass pipe (20) that bypasses the pumping pump (13) is connected to the main pipe (7). That is, one end of the bypass line (20) is connected between the filter (11) and the pump (13), and the other end of the bypass line (20) is the pump (13) and the heat pump (14). Connected between. In this bypass line (20), there is a second that detects the discharge side pressure of the electromagnetic or electric second on-off valve (21), the pressure tank (22), and the pumping pump (13) in this order from one end side. A pressure switch (23) is provided. The pressure tank (22) is configured to compress the internal water by compressing the internal water when groundwater flows into the pressure tank (22).

  The pressure tank (22) and the second pressure switch (23) are not necessarily provided in the bypass pipe (20). For example, the pump (13) in the main pipe (7) and a third on-off valve (described later) 25). Some types of pumps are provided with a pressure tank and a pressure switch. If such a pump is used, the pressure tank and the pressure switch need not be provided on the pipeline.

  Further, an electromagnetic or electric third on-off valve (25) is provided between the other end connecting portion of the bypass pipe (20) in the main pipe (7) and the heat pump (14). In addition, an outside air intake pipe (30) extending vertically upward is connected between the other end connection portion of the bypass pipe (20) in the main pipe (7) and the third on-off valve (25). The outside air intake pipe (30) is opened and closed by an electromagnetic or electric fourth on-off valve (31). The fourth on-off valve (31), the second on-off valve (21), the filter (11), and the first on-off valve (16) are arranged at higher positions in this order, and there is no stagnation of groundwater in the pipe connecting them. Thus, the inflow of groundwater to the filter (11) during the filter cleaning described later can be performed smoothly.

  Further, as shown in FIG. 2, the first and second pressure switches (12) and (23), the pumping pump (13), and the first to fourth on-off valves (16), (21), (25), and (31) For example, it is electrically connected to control means (40) comprising a relay circuit or the like. The control means (40) includes a pumping pump (13) and first to fourth on-off valves (16), (21), (25), (31) by detecting operations of the first and second pressure switches (12), (23). ) Is controlled so that the filter (11) is automatically cleaned. The control means (40) is not limited to a relay circuit, and for example, a microcomputer or the like may be used.

  The pumping pump (13), drain pipe (15), bypass pipe (20), first and second pressure switches (12) (23), pressure tank (22), outside air intake pipe (30 ), The first to fourth on-off valves (16), (21), (25), (31) and the control means (40) constitute a filter cleaning mechanism.

  Next, the automatic cleaning operation of the filter (11) by the filter cleaning mechanism will be described. First, during normal circulation, the first, second, and fourth on-off valves (16), (21), and (31) are closed, the third on-off valve (25) is opened, and the pumping pump (13) is operated. As a result, the groundwater pumped from the first well (1) passes through the filter (11) from the lower surface side toward the upper surface side, and after removing solids such as sand, the pump (13 ) To the heat pump (14). And after heat exchange is made between this groundwater and the refrigerant | coolant of a heat pump (14), it is returned to the underground from the 2nd well (2).

  While repeating such groundwater circulation, solids deposit on the lower surface of the filter (11), the suction side pressure of the pump (13) in the main pipe (7) changes, and the groundwater flow rate is changed. descend. Then, the first pressure switch (12) is activated to start cleaning the filter (11).

  During the cleaning, the third on-off valve (25) is closed by the operation of the first pressure switch (12). At this time, since the pump (13) continues to operate, the groundwater pumped up flows into the pressure tank (22), compresses the internal air, and bypasses the discharge side of the pump (13). A part of groundwater in the pipe (20) and the main pipe (7) is pressurized by the operation of the pump (13).

  When the discharge-side pressure of the pumping pump (13) reaches a preset pressure, the second pressure switch (23) is activated, the pumping pump (13) is stopped, and the first and second opening / closing operations are performed. Valves (16) and (21) open sequentially. Then, the compressed groundwater is sprayed by the air compressed in the pressure tank (22) to the back side, that is, the upper surface side of the solid matter adhesion surface of the filter (11), and adheres to the solid matter adhesion surface, that is, the lower surface side. The solid matter that has fallen off the filter (11). The groundwater used for this washing passes through the filter (11) from the upper surface side to the lower surface side, and is discharged out of the circulation circuit (3) through the drainage pipe (15) together with the solid matter that has been peeled off. To do.

  When such main cleaning is completed, the fourth on-off valve (31) is opened and auxiliary cleaning is started. That is, by opening the fourth on-off valve (31), outside air flows into the main line (7) and the bypass line (20) via the outside air intake line (30), and the main line (7). The groundwater remaining in the bypass pipe (20) passes through the filter (11) from the upper surface side to the lower surface side due to gravity drop, together with the solid matter that could not be removed by the main washing, and the drain pipe (15) Pass through circulation circuit (3).

  As described above, the fourth on-off valve (31) is at the highest position, and the second on-off valve (21), the filter (11), and the first on-off valve (16) are arranged in this order. In addition, since there is no ground water retention portion in the pipe connecting these, the ground water flows smoothly in the pipe in the main cleaning and the auxiliary cleaning, and the cleaning efficiency can be improved.

  When the auxiliary cleaning is completed, the first, second and fourth on-off valves (16), (21) and (31) are closed, the third on-off valve (25) is opened, and the pumping pump (13) is activated. Then, it will return during normal circulation.

  Therefore, by incorporating such a filter cleaning mechanism into the groundwater circulation system and periodically performing the automatic filter cleaning as described above, the groundwater can be stably supplied to the heat pump (14), which is maintenance-free. Can realize air conditioning and hot water supply that maintain high energy consumption efficiency.

  In this embodiment, the cleaning of the filter (11) is started by the operation of the first pressure switch (12). However, the first pressure switch (12) is abolished and the control means (40 Cleaning is performed periodically using a timer connected to the control means, or the cleaning start button connected to the control means (40) is turned on and off to perform cleaning arbitrarily, and further, the pump (13 ) Or a sensor that detects the load on the pump (13) is connected to the control means (40) so that the pump is cleaned when an abnormality occurs in the pump (13). good.

(Second embodiment)
FIG. 3 shows a circuit configuration of a groundwater circulation system according to the second embodiment of the present invention.

  In the circulation circuit (50) of this groundwater circulation system, electromagnetic or electric first and second three-way valves (52) (53) are interposed at both ends of the main pipe (51). The first branch pipe (54) connected to the first three-way valve (52) is connected to the second insertion pipe (6), and the branch pipe (55) connected to the second three-way valve (53). ) Is connected to the first insertion line (5).

  Accordingly, the groundwater pumped from the first well (1) by the operation of the pumping pump (13) by the first insertion pipe (5), the main pipe (51), and the second insertion pipe (6) is supplied to the second well. A first groundwater flow path that returns to the basement from (2) is configured. In addition, the second insertion pipe (6), the branch pipe (54), the main pipe (51), the branch pipe (55), and the first insertion pipe (5) are activated by the pumping pump (13). A second groundwater flow path is configured to reduce the groundwater pumped from the two wells (2) from the first well (1) to the ground.

  In other words, the circulation circuit (50) includes a first groundwater flow path and a second groundwater flow path, and the first and second three-way valves (52) and (53) are switched to appropriately select the flow path to be used. By selecting, groundwater pumped from the first well (1) is returned to the ground from the second well (2), or groundwater pumped from the second well (2) is returned from the first well (1) to the ground. Solid matter contained in the groundwater pumped from both the first well (1) and the second well (2) is removed by a single filter (11). The first and second three-way valves (52) and (53) can be switched by a changeover switch (not shown). Also, the first and second three-way valves (52) (53) are electrically connected to the control means (40), and the three-way valves (52) (53) are switched according to various conditions, so that the wells (1) (2 ) May be automatically replaced.

  Generally, in a well on the reduction side, rust, solids, and the like are deposited, so that the reduction ability is lowered. As this progresses, water overflows from the upper part of the well. However, by exchanging the well on the pumping side and the well on the reduction side as described above, the sediment in the well on the reduction side is pumped together with the groundwater, and the filter (11) is used to rust and solid matter. The deposits deposited on the filter (11) can be removed out of the circulation circuit (50) by the cleaning operation of the filter cleaning mechanism, thereby preventing reduction in reduction capacity. .

  Other configurations and filter automatic cleaning operations are the same as those in the first embodiment, and members having the same functions as those in the first embodiment are denoted by the same reference numerals.

(Reference example)
FIG. 4 shows a circuit configuration of a groundwater circulation system as a reference example .

  A circulation circuit (60) connecting the first well (1) and the second well (2) includes a first insertion line (5) inserted into the first well (1) and a second well (2). It is comprised from the 2nd insertion line (6) inserted in the inside, and the main line (61) which connects these 1st insertion lines (5) and the 2nd insertion line (6).

  The main pipe (61) includes a common pipe (62) provided with a pressure switch (12) for detecting the suction side pressure of the pump (13), the heat pump (14), and the pump (13). From one end of the common pipe (62) through the electromagnetic or electric first three-way valve (63), the branch pipe (65) (66) and from the other end of the common pipe (62) The branch pipes (67) and (68) branched via the electromagnetic or electric second three-way valve (64) are connected to the branch pipes (65) and (67) and the first insertion pipe (5). In addition, a first filter pipe (71) provided with a first filter (70) for removing solids such as sand contained in the groundwater pumped from the first well (1), and a branch pipe (66) ( 68) and the second insertion pipe (6) and a second filter provided with a second filter (72) for removing solids such as sand contained in the groundwater pumped from the second well (2) And a conduit (73).

  Accordingly, the first insertion pipe (5), the first filter pipe (71), the branch pipe (65), the common pipe (62), the branch pipe (68), and the second filter pipe (73). The second insertion pipe (6) constitutes a first groundwater flow path for returning the groundwater pumped from the first well (1) to the ground from the second well (2) by the operation of the pumping pump (13). Yes. The second insertion pipe (6), the second filter pipe (73), the branch pipe (66), the common pipe (62), the branch pipe (67), the first filter pipe (71), The first insertion pipe (5) constitutes a second groundwater flow path for returning the groundwater pumped from the second well (2) to the ground from the first well (1) by the operation of the pumping pump (13). .

  That is, the circulation circuit (60) includes a first groundwater flow path and a second groundwater flow path, and switches the first and second three-way valves (63) and (64) to appropriately select the flow path to be used. By selecting, groundwater pumped from the first well (1) is returned to the ground from the second well (2), or groundwater pumped from the second well (2) is returned from the first well (1) to the ground. The solid matter contained in the groundwater pumped from each well (1) (2) is removed by the first and second filters (70) (72).

  The first filter pipe (71) is connected to the first drain pipe (80) extending vertically downward in correspondence with the first filter (70), and the second filter pipe (73). ) Is connected to a second drain pipe (81) extending vertically downward corresponding to the second filter (72). The first drain pipe (80) is opened and closed by an electromagnetic or electric first on-off valve (82), and the second drain pipe (81) is an electromagnetic or electric second on-off valve ( 83).

  Furthermore, as shown in FIG. 5, the pressure switch (12), the pumping pump (13), the first and second three-way valves (63) and (64), and the first and second on-off valves (82) and (83) For example, it is electrically connected to control means (85) comprising a relay circuit or the like. The control means (85) includes a pumping pump (13), first and second three-way valves (63) and (64), and first and second on-off valves (82) and (83) by detecting operation of the pressure switch (12). ) Is controlled so that the first and second filters 70 and 72 are automatically cleaned. The control means (85) is not limited to a relay circuit, and for example, a microcomputer or the like may be used.

  And said pressure switch (12), pumping pump (13), 1st and 2nd groundwater flow path, 1st and 2nd three-way valve (63) (64), 1st and 2nd drainage pipe line (80) (81), the first and second on-off valves (82) and (83), and the control means (85) constitute a filter cleaning mechanism.

  Next, the automatic cleaning operation of the first and second filters (70) and (72) by the filter cleaning mechanism will be described. First, during normal circulation, the first and second on-off valves (82) and (83) are closed, and the pumping pump (13) is operated. As a result, for example, groundwater pumped up from the first well (1) passes through the first filter (70) from the lower surface side to the upper surface side, and after removing solids such as sand, It is led to the heat pump (14) through the pump (13). And after heat exchange is made between this groundwater and the refrigerant of the heat pump (14), it passes through the second filter (72) from the upper surface side to the lower surface side, and is underground from the second well (2). Reduced to

  While repeating such groundwater circulation, solid matter is deposited on the lower surface of the first filter (70), and the suction side pressure of the pump (13) in the common pipe (62) changes, so that the groundwater The flow rate decreases. Then, the pressure switch (12) is activated to start cleaning the first filter (70).

  During this cleaning, the first on-off valve (82) is opened by the operation of the pressure switch (12), and the first and second three-way valves (63) (64) are switched. Then, groundwater is pumped up from the second well (2), and this groundwater passes through the second filter (72) from the lower surface side toward the upper surface side. At this time, if rust, solids, etc. are accumulated in the second well (2), these deposits are also pumped together with the groundwater and adhere to the solid matter adhering surface, that is, the lower surface of the second filter (72). To do.

  The groundwater pumped up from the second well (2) flows down to the back side, that is, the upper surface side of the solid matter adhering surface of the first filter (70) through the pumping pump (13) and the heat pump (14). Then, the solid matter adhering to the solid matter adhering surface, that is, the lower surface of the first filter (70) is peeled off from the first filter (70). The groundwater used for this washing passes through the first filter (70) from the upper surface side to the lower surface side, and along with the solid matter that has been peeled off, passes through the first drain pipe (80) and the circulation circuit (60 ) Discharge outside.

  Thereafter, the first on-off valve (82) is closed, the second on-off valve (83) is opened, and the first and second three-way valves (63) (64) are switched. Then, groundwater is pumped up from the first well (1), and this groundwater flows down to the back side, that is, the upper surface side of the second filter (72). Then, the solid matter or the like adhering to the solid matter adhering surface, that is, the lower surface of the second filter (72) is removed from the second filter (72). The groundwater used for the washing passes through the second filter (72) from the upper surface side toward the lower surface side, and the second drainage pipe together with the solid matter attached to the lower surface of the second filter (72). It discharges out of the circulation circuit (60) through the path (81). This not only removes solids deposited on the first filter (70) by pumping up groundwater, but also removes rust and solids accumulated in the second well (2) on the reduction side, reducing the reduction capacity. Can be prevented.

  When such cleaning is completed, the pressure switch (12) returns to the initial state, the second on-off valve (83) is closed, and the pressure switch (12) returns to normal circulation. When ground water is pumped up from the second well (2) during normal circulation, the first and second filters (70) and (72) are washed by performing the operation opposite to the above operation. To do.

In this reference example , cleaning of the first and second filters (70), (72) was started by the operation of the pressure switch (12). (85) The cleaning is performed periodically using a timer, the cleaning start button connected to the control means (85) is turned on / off to perform cleaning arbitrarily, and further, the pump is used. Connect the sensor for detecting the stoppage of (13) and the sensor for detecting the load of the hot water pump (13) to the control means (85) so that cleaning is performed when an abnormality occurs in the pump (13). May be.

  Other configurations are the same as those of the first embodiment, and members having the same functions as those of the first embodiment are denoted by the same reference numerals.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention.

It is a figure which shows the circuit structure of the groundwater circulation system provided with the filter washing | cleaning mechanism which concerns on 1st Embodiment of this invention. It is also the block diagram. It is a figure which shows the circuit structure of the groundwater circulation system provided with the filter washing | cleaning mechanism which concerns on 2nd Embodiment. It is a figure which shows the circuit structure of the groundwater circulation system provided with the filter washing | cleaning mechanism which concerns on a reference example . It is also the block diagram.

Explanation of symbols

(1) 1st well
(2) Second well
(3) (50) (60) Circulation circuit
(11) Filter
(13) Pumping pump
(40) (85) Control means
(70) 1st filter
(72) Second filter

Claims (4)

A filter cleaning mechanism in a groundwater circulation system in which a filter that removes solids contained in the pumped-up groundwater is installed in a circulation circuit that returns groundwater pumped up from one well to the ground by operating a pump. There are pressurizing means for pressurizing the pumped-up groundwater, main cleaning means for flowing groundwater pressurized by the pressurizing means from the back side of the solid matter adhering surface of the filter, and after cleaning by the main cleaning means, The circulation circuit is opened to take in outside air, and the auxiliary cleaning means for flowing the ground water of the circulation circuit from the back side of the solid matter adhering surface of the filter by gravity drop, and the ground water used for cleaning by the main cleaning means and the auxiliary cleaning means And a discharge means for discharging the solid matter attached to the filter to the outside of the circulation circuit. Filter cleaning mechanism in the circulation system. The circulation circuit includes a first groundwater flow path for returning groundwater pumped from the first well by operation of the pump to the second well, and groundwater pumped from the second well by operation of the pump. The groundwater circulation according to claim 1, further comprising: a second groundwater flow path that returns from the first well to the ground, wherein the filter removes solids contained in the groundwater pumped from both the first well and the second well. Filter cleaning mechanism in the system. The filter in the groundwater circulation system according to claim 1 or 2 , further comprising control means for controlling the operation of the pump, the main washing means, the auxiliary washing means, and the discharge means to automatically wash the filter. Cleaning mechanism. The filter cleaning mechanism in the groundwater circulation system according to any one of claims 1 to 3 , wherein the circulation circuit is provided with a heat pump for using the pumped-up groundwater as various heat sources such as air conditioning and hot water supply.