Connecting pipe circulation filtration device

Abstract

To provide a communication pipe type circulation filtration apparatus that can clean the interiors of a communication pipe and a level pipe, and make the interiors sanitary.SOLUTION: Bathtubs 1 and 2 are arranged at approximately the same level, and each lower part of the bathtubs 1 and 2 is connected to each upper part of the bathtubs 1 and 2 in a loop with a circulation pipe 5 via a filtration unit 3 and a heating unit 4. A level pipe 6 is provided at approximately the same level as the bathtubs 1 and 2, and the bottom of the bathtubs 1 and 2 and the bottom of the level pipe 6 are connected with a communication pipe 7. A circulation / drainage branch pipe 9-1 is also connected that branches from the communication pipe 7 to the downstream side of circulation pipe 5 or to the drainage system. In the circulation / drainage branch pipe 9-1, there are provided branch pipe flow control valves 9-1a, 9-1b, 9-1c and a branch pipe pump 9-1d. When the branch pipe flow control valves 9-1a and 9-1b are open, the circulation / drainage branch pipe 9-1 acts as a circulation branch pipe, and when the branch pipe flow control valves 9-1a and 9-1c are open, the circulation / drainage branch pipe 9-1 acts as a drainage branch pipe.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a communication pipe type circulation filtration device for multiple tanks. [Background technology]

[0002] Conventionally, in a conventional circulating filtration system using a communicating pipe that has multiple tanks, such as multiple bathtubs and pools, filtering is performed by a single pump and a single filtration unit due to considerations of installation space and cost (see Patent Document 1). In this case, the filtration unit is equipped with a circulation pipe that connects the lower parts of the multiple tanks to the upper parts of the multiple tanks in a loop, and a communication pipe that connects the multiple tanks to a level pipe that detects the water level, and the water levels of the multiple tanks are maintained at the same level as the water level in the level pipe. This allows the water from the multiple tanks to be circulated through the circulation pipe, constantly cleaning the multiple tanks, and the communicating pipe allows the water levels between the multiple tanks to be maintained at the same level. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-137630 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-329381 [Patent Document 3] JP 2015-104718 A (Patent No. 6253376 A) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional communicating pipe type circulation filtration device, since the communicating pipes are isolated, water remains in the communicating pipes and the level pipe and cannot be purified, which is unhygienic.

[0005] There are also non-communicating pipe type circulating filtration systems that do not use communicating pipes. For example, in a first non-communicating pipe type circulating filtration system, in order to eliminate the imbalance in water levels between tanks caused by differences in discharge and suction flow rates, each tank is equipped with the required number of devices for suctioning surface water or similar surface water recovery functions, and the circulating pipe serves as the surface water suction piping (see Patent Document 2). On the other hand, in a second non-communicating pipe type circulating filtration system that does not use communicating pipes, the discharge port of each tank is connected to a filtration unit, and the amount of water branching from the filtration unit to the suction port of each tank is controlled according to the value of a pressure sensor in each tank (see Patent Document 3).

[0006] However, the first non-communicating pipe type circulating filtration device described above is complicated and requires troublesome maintenance. Adding or removing tanks requires modifying the device, which is extremely difficult. Furthermore, when cleaning with chemicals such as hydrogen peroxide, each tank must be filled with water, which increases cleaning costs. On the other hand, the second non-communicating pipe type circulating filtration device described above requires a pressure sensor and complex control, which increases the manufacturing cost of the device. Furthermore, if the pressure sensor or the control unit that controls the pressure sensor breaks down, the tank itself becomes unusable. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the communication pipe type circulation filtration device according to the present invention comprises: To ensure the water level is the same a circulation pipe that connects the lower part of each of the plurality of tanks to the upper part of each of the plurality of tanks in a loop; a circulation pipe pump and a filtration unit that are provided in the circulation pipe loop; a level pipe for detecting the water level of each of the plurality of tanks; and a communication pipe that communicates with the plurality of tanks and the level pipe, and a branch from the communication pipe to the circulation pipe. Circulatory branch ducts This is the system that has been established. [Effects of the Invention]

[0008] According to the present invention, the inside of the communicating pipe and the level pipe can be cleaned by discharging the water therein through the circulation branch pipe or the drainage branch pipe, thereby making the inside of the communicating pipe and the level pipe sanitary. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a first embodiment of a communication pipe type circulation filtration device according to the present invention; [Figure 2] 2A and 2B are diagrams for explaining the operation of the communication pipe and the level pipe in FIG. 1. [Figure 3] 2 is a diagram for explaining the cleaning operation of the communication pipe and the level pipe in FIG. 1 with circulating water. FIG. [Figure 4] 1. FIG. 4 is a diagram for explaining the cleaning operation of the communication pipe and the level pipe in FIG. [Figure 5] 2 is a diagram for explaining the cleaning operation of the communication pipe and the level pipe in FIG. 1 with makeup water. FIG. [Figure 6] FIG. 2 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG. [Figure 7] FIG. 2 is a diagram showing a second embodiment of a communication pipe type circulation filtration device according to the present invention. [Figure 8] 8A and 8B are diagrams for explaining the operation of the communication pipe and the level pipe in FIG. 7. [Figure 9] FIG. 8 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG. [Figure 10] 10 is a diagram for explaining the cleaning operation of the communication pipe and the level pipe in FIG. 9 with makeup water. FIG. [Figure 11] FIG. 10 is a diagram showing a third embodiment of a communication pipe type circulation filtration device according to the present invention. [Figure 12] 12 is a diagram showing a detailed structure of the ejector of FIG. 11. FIG. [Figure 13] FIG. 12 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG. [Figure 14] FIG. 10 is a diagram showing a fourth embodiment of a communication pipe type circulation filtration device according to the present invention. [Figure 15] FIG. 15 is a diagram showing a system having a plurality of communicating pipes and a single circulating pipe, to which the communicating pipe type circulating filtration devices of FIGS. 1, 7, 11 and 14 are applied. DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 is a diagram showing a first embodiment of a communication pipe type circulation filtration device according to the present invention.

[0011] In Figure 1, bathtubs 1 and 2 are To ensure the water level is the same The lower (or bottom) sections of the bathtubs 1 and 2 are connected to the upper sections of the bathtubs 1 and 2 in a loop by a circulation pipe 5 via a filtration unit 3 and a heating unit 4. The filtration unit 3 contains sand, porous ceramic, etc., and suppresses the growth of Legionella bacteria. It may also contain a deep ultraviolet light generator, a photocatalyst, etc., and may further include a hair catcher to remove hair, etc. The heating unit 4 is an electric heater, heat pump, heat exchanger, etc. Furthermore, a circulation pipe pump 5a is provided upstream of the filtration unit 3. That is, the circulation pipe pump 5a sucks water from the lower sections of the bathtubs 1 and 2 and discharges it toward the filtration unit 3. When the circulation pipe pump 5a is turned on, the water in the bathtubs 1 and 2 circulates through the circulation pipe 5, where it is filtered by one filtration unit 3 and heated by one heating unit 4.

[0012] Also, bathtubs 1 and 2 Arranged so that the water level is the same A level pipe 6 is provided, and the bottoms of bathtubs 1 and 2 are connected to the bottom of level pipe 6 by a communication pipe 7. Level pipe 6 has a pressure sensor and the like whose pressure changes depending on the water level. Communication pipe flow control valves 7a, 7b, and 7c (or solenoid valves) are provided in communication pipe 7 on the bathtubs 1 and 2 and level pipe 6 sides.

[0013] Furthermore, a make-up water tank 8 (or water faucet) and a make-up water flow control valve 8a (or solenoid valve) are provided above the bathtubs 1 and 2. The make-up water tank 8 (or water faucet) is also referred to as the make-up water side.

[0014] Furthermore, a branch pipe (hereinafter, "circulation / drainage branch pipe") 9-1 is connected to the communicating pipe 7, branching off to the downstream side of the circulation pipe 5 or to a drainage facility. However, for example, in the claims, the circulation / drainage branch pipe 9-1 may be simply referred to as the circulation branch pipe 9-1. That is, the circulation / drainage branch pipe 9-1 is connected to the downstream side of the filtration unit 3 or the heating unit 4, and is also connected to a drainage facility. Branch pipe flow control valves 9-1a, 9-1b, and 9-1c (or solenoid valves) and a branch pipe pump 9-1d are provided in the circulation / drainage branch pipe 9-1. The branch pipe pump 9-1d sucks water from the communicating pipe 7 and discharges it to the circulation pipe 5 or to a drainage facility. In this case, the branch pipe flow control valve 9-1a is located upstream of the branch pipe pump 9-1d, and the branch pipe flow control valves 9-1b and 9-1c are located downstream of the branch pipe pump 9-1d. Furthermore, branch pipe flow control valve 9-1b is connected to the downstream side of filtration unit 3 (heating unit 4) of circulation pipe 5, and branch pipe flow control valve 9-1c is connected to the drainage equipment side. Therefore, when branch pipe flow control valves 9-1a and 9-1b are opened, circulation / drainage branch pipe 9-1 acts as a circulation branch pipe, and branch pipe pump 9-1d sucks water from connecting pipe 7 and discharges it toward the downstream side of circulation pipe 5. On the other hand, when branch pipe flow control valves 9-1a and 9-1c are opened, circulation / drainage branch pipe 9-1 acts as a drainage branch pipe, and branch pipe pump 9-1d drains water from connecting pipe 7.

[0015] The control circuit 10, e.g., a microcomputer, receives the water surface level signal 6a from the level pipe 6 and controls the circulation pipe pump 5a, the connecting pipe flow control valves (solenoid valves) 7a, 7b, and 7c, the makeup water flow control valve 8a, and the branch pipe flow control valves (solenoid valves) 9-1a, 9-1b, and 9-1c.

[0016] Furthermore, a make-up water branch pipe 11 is provided that branches off from the communicating pipe 7 toward the make-up water side. The make-up water branch pipe 11 sucks water from the make-up water side and discharges it to the communicating pipe 7 side via make-up water flow control valves 11a, 11b, and 11c controlled by the control circuit 10. The make-up water branch pipe 11 will be described later.

[0017] FIG. 2 is a diagram for explaining the operation of the communication pipe 7 and the level pipe 6 in FIG. 1, and omits the filtration unit 3, the heating unit 4, the circulation pipe 5, and the circulation / drain branch pipe 9-1 in FIG.

[0018] In Figure 2, control circuit 10 opens connecting pipe flow control valves 7a, 7b, and 7c, closes branch pipe flow control valves 9-1a, 9-1b, and 9-1c (see Figure 1) and makeup water flow control valves 11a, 11b, and 11c (see Figure 5), and turns off branch pipe pump 9-1d (see Figure 1). As a result, the water levels in bathtubs 1 and 2 are controlled to be the same as the water level in level pipe 6. That is, when the water level in one of bathtubs 1 and 2 rises, water in that bathtub flows into the other bathtub. Conversely, when the water level in one of bathtubs 1 and 2 drops, water in the other bathtub flows into that bathtub, so that the water levels in bathtubs 1 and 2 are the same. At the same time, the water levels in bathtubs 1 and 2 are detected by level pipe 6. As a result, when the water surface level signal 6a from the level pipe 6 is lower than a predetermined value, the control circuit 10 opens the makeup water flow control valve 8a, water is supplied to the bathtubs 1 and 2 from the makeup water tank (or water faucet) 8, and when the water surface level signal 6a from the level pipe 6 reaches the predetermined value, the control circuit 10 closes the makeup water flow control valve 8a. In this way, the water surface levels in the bathtubs 1 and 2 are kept at the predetermined level. Note that even when the water surface level signal 6a from the level pipe 6 is higher than the predetermined value, the control circuit 10 keeps the makeup water flow control valve 8a closed.

[0019] FIG. 3 is a diagram for explaining the cleaning operation of the communication pipe 7 and the level pipe 6 in FIG. 1 with circulating water, and omits the filtration unit 3, the heating unit 4, and the make-up water tank (or water tap) 8 in FIG. 1.

[0020] 3A, the cleaning operation of the portion of communicating pipe 7 that communicates with bathtub 1 will be described. In this case, control circuit 10 opens, closes, and closes communicating pipe flow control valves 7a, 7b, and 7c, opens branch pipe flow control valves 9-1a and 9-1b, closes branch pipe flow control valve 9-1c, and turns on branch pipe pump 9-1d. As a result, circulation / drain branch pipe 9-1 functions as a circulation branch pipe, and water from bathtub 1 flows downstream of circulation pipe 5 from communicating pipe flow control valve 7a through branch pipe flow control valve 9-1a, branch pipe pump 9-1d, and branch pipe flow control valve 9-1b. Therefore, the portion of communicating pipe 7 that communicates with bathtub 1 is cleaned. In this case, the water used for cleaning is returned to bathtubs 1 and 2 via circulation pipe 5 and recovered.

[0021] 3B, the cleaning operation of the portion of communicating pipe 7 that communicates with bathtub 2 will be described. In this case, control circuit 10 closes, opens, and closes communicating pipe flow control valves 7a, 7b, and 7c, opens branch pipe flow control valves 9-1a and 9-1b, closes branch pipe flow control valve 9-1c, and turns on branch pipe pump 9-1d. As a result, circulation / drain branch pipe 9-1 functions as a circulation branch pipe, and water from bathtub 2 flows downstream of circulation pipe 5 from communicating pipe flow control valve 7b through branch pipe flow control valve 9-1a, branch pipe pump 9-1d, and branch pipe flow control valve 9-1b. Therefore, the portion of communicating pipe 7 that communicates with bathtub 2 is cleaned. In this case, the water used for cleaning is returned to bathtubs 1 and 2 via circulation pipe 5 and recovered.

[0022] The cleaning operation of the level pipe 6 will be described with reference to FIG. 3(C). In this case, the control circuit 10 closes, closes, and opens the communicating pipe flow control valves 7a, 7b, and 7c, opens the branch pipe flow control valves 9-1a, 9-1b, and 9-1c, closes the branch pipe flow control valve 9-1c, and turns on the branch pipe pump 9-1d. As a result, the circulation / drain branch pipe 9-1 acts as a circulation branch pipe, and water from the level pipe 6 flows downstream of the circulation pipe 5 from the communicating pipe flow control valve 7c through the branch pipe flow control valve 9-1a, the branch pipe pump 9-1d, and the branch pipe flow control valve 9-1b. Therefore, the level pipe 6 is cleaned. In this case, the water used for cleaning is returned to the bathtubs 1 and 2 via the circulation pipe 5 and recovered.

[0023] 3(D), the cleaning operation of the portion of communicating pipe 7 communicating with bathtubs 1 and 2 and the portion of level pipe 6 will be described. In this case, control circuit 10 opens communicating pipe flow control valves 7a, 7b, and 7c, opens branch pipe flow control valves 9-1a and 9-1b, closes branch pipe flow control valve 9-1c, and turns on branch pipe pump 9-1d. As a result, circulation / drain branch pipe 9-1 functions as a circulation branch pipe, and water from bathtubs 1 and 2 flows from communicating pipe flow control valves 7a and 7b, and water from level pipe 6 flows from communicating pipe flow control valve 7c through branch pipe flow control valve 9-1a, branch pipe pump 9-1d, and branch pipe flow control valve 9-1b to the downstream side of circulation pipe 5. Therefore, the portion of communicating pipe 7 communicating with bathtubs 1 and 2 and the portion of level pipe 6 are cleaned. In this case, the water used for washing is returned to the bathtubs 1 and 2 via the circulation pipe 5 and collected.

[0024] When cleaning two sections of the communicating pipe 7 that connect to the bathtubs 1 and 2 and the level pipe 6, two of the communicating pipe flow control valves 7a, 7b, and 7c are opened and the remaining one is closed, the branch pipe flow control valves 9-1a and 9-1b are opened, the branch pipe flow control valve 9-1c is closed, and the branch pipe pump 9-1d is turned on to make the circulation / drain branch pipe 9-1 a circulation branch pipe.

[0025] 4 is a diagram for explaining the cleaning operation by draining the communicating pipe 7 and the level pipe 6 in FIG. 1, and does not include the filtration unit 3, the heating unit 4, the circulation pipe 5, and the make-up water tank 8 in FIG. 1. In this case, the make-up water branch pipe 11 is not operated.

[0026] The following describes the cleaning operation of the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the portion of the level pipe 6. In this case, the control circuit 10 opens the connecting pipe flow control valves 7a, 7b, and 7c, opens the branch pipe flow control valves 9-1a and 9-1c, closes the branch pipe flow control valve 9-1b, and turns on the branch pipe pump 9-1d. As a result, the circulation / drain branch pipe 9-1 becomes a drain branch pipe, and water from the bathtubs 1 and 2 and the level pipe 6 flows from the connecting pipe flow control valves 7a, 7b, and 7c through the branch pipe flow control valve 9-1a, the branch pipe pump 9-1d, and the branch pipe flow control valve 9-1c to the drainage system. Therefore, the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the level pipe 6 is cleaned. Note that in this case, the water used for cleaning is drained, so the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7 decreases. In this case, the make-up water flow control valve 8a is opened to directly increase the amount of water in the bathtubs 1 and 2.

[0027] FIG. 5 shows the structure of the communication pipe 7 and the level pipe 6 of FIG. make-up water 1. In this figure, the filtration unit 3, the heating unit 4, the circulation pipe 5, and the make-up water tank 8 are omitted. In this case, the make-up water branch pipe 11 is operated.

[0028] As shown in Figure 5, make-up water branch pipe 11 is connected to communicating pipe 7 via make-up water flow control valves 11a, 11b, and 11c, and is located symmetrically to circulation / drainage branch pipe 9-1 with respect to communicating pipe 7. Therefore, make-up water sucked into make-up water branch pipe 11 passes widely through communicating pipe 7, where it is cleaned, before flowing into circulation / drainage branch pipe 9-1.

[0029] The part of the communication pipe 7 that communicates with the bathtubs 1 and 2 and the part of the level pipe 6 make-up waterThe flushing operation will be described below. In this case, control circuit 10 closes communicating pipe flow control valves 7a, 7b, and 7c, opens makeup water flow control valves 11a, 11b, and 11c, opens branch pipe flow control valves 9-1a and 9-1c, closes branch pipe flow control valve 9-1b (see FIG. 1), and turns on branch pipe pump 9-1d. As a result, circulation / drain branch pipe 9-1 becomes a drain branch pipe, and makeup water flows from makeup water flow control valves 11a, 11b, and 11c to the drainage equipment via branch pipe flow control valve 9-1a, branch pipe pump 9-1d, and branch pipe flow control valve 9-1c. Therefore, the portions of communicating pipe 7 that communicate with bathtubs 1 and 2 and level pipe 6 are flushed. In this case, the water used for washing is drained, but the connecting pipe 7 is replenished with makeup water, so the amount of water in the bathtubs 1 and 2, the level pipe 6 and the connecting pipe 7 does not decrease.

[0030] FIG. 6 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG.

[0031] In Figure 6, the branch pipe flow control valves 9-1b and 9-1c in Figure 1 have been eliminated, and the branch pipe pump 9-1d is directly connected to the downstream side of the circulation pipe 5. Therefore, the communicating pipe 7 is cleaned using only the circulating water, so the water does not decrease. As a result, makeup water is not required, and the makeup water branch pipe 11 is not provided.

[0032] FIG. 7 is a diagram showing a second embodiment of a communication pipe type circulation filtration device according to the present invention.

[0033] In Figure 7, a circulation branch pipe 9-2 is provided in place of the circulation / drain branch pipe 9-1 in Figure 1. The circulation branch pipe 9-2 branches off from the communicating pipe 7 and is connected between it and the upstream side (suction side) of the circulation pipe pump 5a. A branch pipe flow control valve 9-2a (or solenoid valve) is provided in the circulation branch pipe 9-2, and a circulation pipe flow control valve 5b (or solenoid valve) is provided in the circulation pipe 5 upstream of the circulation pipe pump 5a. However, the circulation pipe flow control valve 5b may be omitted, and the circulation pipe 5 may be kept operating constantly when the circulation pipe pump 5a is turned on.

[0034] In Figure 7, when the control circuit 10 opens the connecting pipe flow control valves 7a, 7b, and 7c and closes the branch pipe flow control valve 9-2a, the water level in the bathtubs 1 and 2 is controlled to be the same as the water level in the level pipe 6.

[0035] FIG. 8 is a diagram for explaining the cleaning operation of the communication pipe 7 and the level pipe 6 in FIG. 7 with circulating water, and the filtration unit 3 and the heating unit 4 in FIG. 7 are omitted.

[0036] Referring to Figure 8(A), the cleaning operation of the portion of communicating pipe 7 that communicates with bathtub 1 will be described. In this case, control circuit 10 opens, closes, and closes communicating pipe flow control valves 7a, 7b, and 7c, and opens branch pipe flow control valve 9-2a. As a result, water from bathtub 1 flows from communicating pipe flow control valve 7a through branch pipe flow control valve 9-2a to the downstream side of circulation pipe 5. Therefore, the portion of communicating pipe 7 that communicates with bathtub 1 is cleaned. In this case, the water used for cleaning is returned to bathtubs 1 and 2 through circulation pipe 5 and collected.

[0037] Referring to Figure 8(B), the cleaning operation of the portion of communicating pipe 7 that communicates with bathtub 2 will be described. In this case, control circuit 10 closes, opens, and closes communicating pipe flow control valves 7a, 7b, and 7c, and opens branch pipe flow control valve 9-2a. As a result, water from bathtub 2 flows from communicating pipe flow control valve 7b through branch pipe flow control valve 9-2a to the downstream side of circulation pipe 5. Therefore, the portion of communicating pipe 7 that communicates with bathtub 2 is cleaned. In this case, the water used for cleaning is returned to bathtubs 1 and 2 via circulation pipe 5 and collected.

[0038] The cleaning operation of the level pipe 6 will be described with reference to Figure 8 (C). In this case, the control circuit 10 closes, closes, and opens the communicating pipe flow control valves 7a, 7b, and 7c, and opens the branch pipe flow control valve 9-2a. As a result, the water in the level pipe 6 flows from the communicating pipe flow control valve 7c to the downstream side of the circulation pipe 5 via the branch pipe flow control valve 9-2a. Therefore, the level pipe 6 is cleaned. In this case, the water used for cleaning is returned to the bathtubs 1 and 2 via the circulation pipe 5 and collected.

[0039] Referring to Figure 8 (D), the cleaning operation of the portion of communicating pipe 7 that communicates with bathtubs 1 and 2 and the portion of level pipe 6 will be described. In this case, control circuit 10 opens communicating pipe flow control valves 7a, 7b, and 7c, and opens branch pipe flow control valve 9-2a. As a result, water from bathtubs 1 and 2 flows through communicating pipe flow control valves 7a and 7b, and water from level pipe 6 flows from communicating pipe flow control valve 7c to the downstream side of circulation pipe 5 via branch pipe flow control valve 9-2a. Therefore, the portion of communicating pipe 7 that communicates with bathtubs 1 and 2 and the portion of level pipe 6 are cleaned. In this case, the water used for cleaning is returned to bathtubs 1 and 2 via circulation pipe 5 and recovered.

[0040] When cleaning two sections of the communicating pipe 7 that connect to the bathtubs 1 and 2 and the level pipe 6, two of the communicating pipe flow control valves 7a, 7b, and 7c are opened, the remaining one is closed, and the branch pipe flow control valve 9-2a is opened.

[0041] FIG. 9 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG.

[0042] In Fig. 9, a drainage branch pipe 9-2' is connected to the drainage equipment from the communicating pipe 7, and the drainage branch pipe 9-2' includes a drainage flow control valve 9-2'a and a drainage pump 9-2'b connected in series. Also, a makeup water branch pipe 11 is connected to the makeup water side from the communicating pipe 7. The makeup water branch pipe 11 includes makeup water flow control valves 11a, 11b, and 11c. Therefore, similar to the communicating pipe type circulation filtration device of Fig. 1, the communicating pipe 7 and the level pipe 6 of Fig. 9 drainage Cleaning operation can be performed by

[0043] For example, let us consider the flushing operation of the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the portion of the level pipe 6 without operating the makeup water branch pipe 11. In this case, the control circuit 10 opens the connecting pipe flow control valves 7a, 7b, and 7c, opens the drain flow control valve 9-2'a, and turns on the drain pump 9-2'b. As a result, water from the bathtubs 1 and 2 and the level pipe 6 flows from the connecting pipe flow control valves 7a, 7b, and 7c through the branch pipe flow control valve 9-1a, the drain pump 9-2'b, and the drain flow control valve 9-2'a to the drainage system. Therefore, the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the level pipe 6 is flushed. Note that in this case, the water used for flushing is drained, reducing the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7. In this case, the makeup water flow control valve 8a is opened to directly increase the amount of water in the bathtubs 1 and 2.

[0044] As shown in Figure 10, make-up water branch pipe 11 is connected to communicating pipe 7 via make-up water flow control valves 11a, 11b, and 11c, and is located symmetrically to drainage branch pipe 9-2' with respect to communicating pipe 7. Therefore, make-up water sucked in by make-up water branch pipe 11 passes widely through communicating pipe 7, cleansing it, and then flows into drainage branch pipe 9-2'.

[0045] The part of the communication pipe 7 that operates the supply water branch pipe 11 and that communicates with the bathtubs 1 and 2 and the part of the level pipe 6 make-up water The flushing operation will be described below. In this case, control circuit 10 closes connecting pipe flow control valves 7a, 7b, and 7c, opens make-up water flow control valves 11a, 11b, and 11c, opens drain flow control valve 9-2'a, and turns on drain pump 9-2'b. As a result, make-up water flows from make-up water flow control valves 11a, 11b, and 11c to the drainage system via drain pump 9-2'b and drain flow control valve 9-2'a. Therefore, the portion of connecting pipe 7 that communicates with bathtubs 1 and 2 and level pipe 6 is flushed. Note that, although the water used for flushing is drained, connecting pipe 7 is replenished with make-up water, so the amount of water in bathtubs 1 and 2, level pipe 6, and connecting pipe 7 does not decrease.

[0046] FIG. 11 is a diagram showing a third embodiment of a communication pipe type circulation filtration device according to the present invention.

[0047] In Figure 11, instead of the circulation branch pipe 9-2 and branch pipe flow control valve 9-2a in Figure 7, a circulation branch pipe 9-3 and branch pipe flow control valve 9-3a are provided, and the circulation branch pipe 9-3 is connected between the circulation pump 5a of the circulation pipe 5 and the filtration unit 3 via an ejector 12.

[0048] FIG. 12 is a diagram showing the detailed structure of the ejector 12 of FIG.

[0049] 12A, the ejector 12 is composed of a nozzle 122 having a driving fluid inlet 121 for drawing in a driving fluid F1, a body 124 that houses the nozzle 122 and has a suction fluid inlet 123 for drawing in a suction fluid F2 into a low-pressure region LR downstream of the nozzle 122 caused by the driving fluid F1, and a diffuser (mixing section) 126 having a discharge fluid outlet 125 for drawing in and mixing the driving fluid F1 and the suction fluid F2 as a high-speed jet fluid F3 and discharging the resulting jet fluid F4. The nozzle 122 converts the pressure energy of the driving fluid F1 into kinetic energy (decompression and acceleration), while the diffuser (mixing section) 126 consists of a suction section 1261 with a gradually decreasing diameter and a compression / pressure-boosting section 1262 with a gradually increasing diameter, and recovers the kinetic energy into pressure energy (deceleration and pressure increase). Here, water from the circulation pump 5a is used as the driving fluid F1, water from the circulation branch pipe 9-3 is used as the suction fluid F2, and water is sent to the filtration unit 3 as the discharge fluid F4.

[0050] 11, an auxiliary valve may be provided upstream or downstream of the circulation pump 5a. The suction speed of water in the circulation branch pipe 9-3 as the suction fluid F2 is determined by the design of the nozzle 122 and diffuser 126 of the ejector 12 and the design of the circulation pump 5a, and the flow speed of water in the circulation branch pipe 9-3 can be adjusted to be much slower than the flow speed of water in the circulation pump 5a.

[0051] In Figure 11, the water levels in bathtubs 1 and 2 and level pipe 6 can be adjusted by opening communicating pipe flow control valves 7a, 7b, and 7c and closing branch pipe flow control valve 9-3a. On the other hand, by opening at least one of communicating pipe flow control valves 7a, 7b, and 7c and branch pipe flow control valve 9-3a, communicating pipe 7 and level pipe 6 can be cleaned with circulating water.

[0052] FIG. 12B is a modification of FIG. 12A.

[0053] As shown in FIG. 12B, the body 124 is provided with an air fluid inlet 127 for drawing in an air fluid F5. The air fluid F5 is ambient air. This allows microbubbles and / or ultrafine bubbles to be mixed into the discharge fluid F4, thereby enhancing the cleaning effect of the circulation pipe 5 and the connecting pipe 7. The air fluid F5 may also be an air fluid containing clusters of water molecules gathered around ions, which are generated by plasma discharge such as arc discharge or corona discharge. The air fluid F5 may also be an air fluid containing ozone. This also enables sterilization of the circulation pipe 5 and the connecting pipe 7.

[0054] FIG. 13 is a diagram showing a modification of the communication pipe type circulation filtration device of FIG.

[0055] In Figure 13, a drainage branch pipe 9-3' is connected to the drainage equipment from the communicating pipe 7, and includes a drainage flow control valve 9-3'a and a drainage pump 9-3'b connected in series. Also, a makeup water branch pipe 11 is connected to the makeup water side from the communicating pipe 7. The makeup water branch pipe 11 includes makeup water flow control valves 11a, 11b, and 11c. Therefore, similar to the communicating pipe type circulating filtration system of Figure 1, the communicating pipe 7 and level pipe 6 of Figure 9 can be flushed with drainage / makeup water.

[0056] For example, let us consider a flushing operation by draining the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the portion of the level pipe 6 without operating the makeup water branch pipe 11. In this case, the control circuit 10 opens the connecting pipe flow control valves 7a, 7b, and 7c, opens the drain flow control valve 9-3'a, and turns on the drain pump 9-3'b. As a result, water from the bathtubs 1 and 2 and the level pipe 6 flows from the connecting pipe flow control valves 7a, 7b, and 7c to the drain pump 9-3'b and the drain flow control valve 9-3'a and into the drainage system. Therefore, the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the level pipe 6 is flushed. Note that in this case, the water used for flushing is drained, so the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7 decreases. In this case, the makeup water flow control valve 8a is opened to directly increase the amount of water in the bathtubs 1 and 2.

[0057] The part of the communication pipe 7 that operates the supply water branch pipe 11 and that communicates with the bathtubs 1 and 2 and the part of the level pipe 6 make-up water In this case, the control circuit 10 controls the communication pipe flow control valves 7a, 7b, and 7c. close, close, close Then, make-up water flow control valves 11a, 11b, and 11c are opened, opened, and the drainage flow control valve 9-3'a is opened, and the drainage pump 9-3'b is turned on. As a result, make-up water flows from make-up water flow control valves 11a, 11b, and 11c to the drainage equipment via the drainage pump 9-3'b and the drainage flow control valve 9-3'a. Therefore, the portions of the connecting pipe 7 that communicate with the bathtubs 1 and 2 and the level pipe 6 are cleaned. In this case, the water used for cleaning is drained, but the connecting pipe 7 is replenished with make-up water, so the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7 does not decrease.

[0058] FIG. 14 is a diagram showing a fourth embodiment of a communication pipe type circulation filtration device according to the present invention.

[0059] In Figure 14, there is no circulation branch pipe, but there are a drainage branch pipe 9-4 and a make-up water branch pipe 11 that branch off from the communication pipe 7 to the drainage equipment. The drainage branch pipe 9-4 includes a drainage flow control valve 9-4a and a drainage pump 9-4b connected in series. The make-up water branch pipe 11 includes make-up water flow control valves 11a, 11b, and 11c.

[0060] In FIG. 14, the communication pipe 7 and the level pipe 6 can be cleaned by draining or making up water.

[0061] The following describes the flushing operation of the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the portion of the level pipe 6 when the water supply branch pipe 11 is not operating. In this case, the control circuit 10 opens the connecting pipe flow control valves 7a, 7b, and 7c, opens the drain flow control valve 9-4a, and turns on the drain pump 9-4b. As a result, water from the bathtubs 1 and 2 and the level pipe 6 flows from the connecting pipe flow control valves 7a, 7b, and 7c through the branch pipe flow control valve 9-1a, the drain pump 9-4b, and the drain flow control valve 9-4a to the drainage system. Therefore, the portion of the connecting pipe 7 that connects to the bathtubs 1 and 2 and the level pipe 6 is flushed. Note that in this case, the water used for flushing is drained, reducing the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7. In this case, the amount of water in the bathtubs 1 and 2 is directly increased.

[0062] Next, the operation of cleaning the portion of the connecting pipe 7 that communicates with the bathtubs 1 and 2 and the portion of the level pipe 6 by operating the makeup water branch pipe 11 will be described. In this case, the control circuit 10 closes the connecting pipe flow control valves 7a, 7b, and 7c, opens the makeup water flow control valves 11a, 11b, and 11c, opens the drainage flow control valve 9-4a, and turns on the drainage pump 9-4b. As a result, makeup water flows from the makeup water flow control valves 11a, 11b, and 11c to the drainage system via the drainage pump 9-4b and the drainage flow control valve 9-4a. Therefore, the portion of the connecting pipe 7 that communicates with the bathtubs 1 and 2 and the level pipe 6 is cleaned. Note that in this case, the water used for cleaning is drained, but the connecting pipe 7 is replenished with makeup water, so the amount of water in the bathtubs 1 and 2, the level pipe 6, and the connecting pipe 7 does not decrease.

[0063] The communicating pipe type circulating filtration devices of Figures 1, 7, 11 and 14 can be applied to a system having a single circulating pipe and multiple communicating pipes as shown in Figure 15. In any of Figures 15 (A), (B), (C) and (D), each communicating pipe 7-1 (7-2, 7-3) is To ensure the water level is the sameThe tub 7-1 is connected to multiple bathtubs and level pipes in the men's bathroom, the tub 7-2 is connected to multiple bathtubs and level pipes in the women's bathroom, and the tub 7-3 is connected to multiple bathtubs and level pipes in the children's bathroom, all of which are located on the same floor and are filtered by the common circulating pipe 5.

[0064] As shown in Figure 15(A), when the communicating pipe type circulation filtration device of Figure 1 is expanded and applied to a system having multiple communicating pipes, one circulation / drainage branch pipe 9-1 branching from the communicating pipes 7-1, 7-2, and 7-3 to the circulation pipe 5 and drainage equipment is selectively connected to the circulation pipe 5 or drainage equipment via a branch pipe pump 9-1d and further via a branch pipe flow control valve 9-1b or 9-1c.

[0065] As shown in Figure 15(B), when the communicating pipe type circulation filtration device of Figure 7 is expanded and applied to a system having multiple communicating pipes, one circulation branch pipe 9-2 branching from the communicating pipes 7-1, 7-2, and 7-3 to the circulation pipe 5 is connected to the upstream side of the circulation pump 5a of the circulation pipe 5.

[0066] As shown in Figure 15(C), when the communicating pipe type circulation filtration device of Figure 11 is expanded and applied to a system having multiple communicating pipes, one circulation branch pipe 9-3 branching from the communicating pipes 7-1, 7-2, and 7-3 to the circulation pipe 5 is connected to the suction fluid inlet 123 of the ejector 12 provided in the circulation pipe 5.

[0067] As shown in Figure 15(D), when the communicating pipe type circulating filtration device of Figure 14 is expanded and applied to a system having a plurality of communicating pipes, one drainage branch pipe 9-4 branching from the communicating pipes 7-1, 7-2, 7-3 to the drainage equipment is connected to the drainage equipment. Also, one makeup water branch pipe 11 branching from the communicating pipes 7-1, 7-2, 7-3 to the makeup water side is connected. As a result, communication pipe 7-1, 7-2, 7-3 make-up water This makes cleaning possible.

[0068] In the above-described embodiment, three or more bathtubs can be provided. If a pool is provided instead of the bathtubs, the heating unit can be omitted.

[0069] In the above-described embodiment, the flow control valve or the solenoid valve may be a manual valve.

[0070] Furthermore, in the above-described embodiment, the circulation pump 5a, the filtration unit 3, and the heating unit 4 are arranged in this order from upstream to downstream in the circulation pipe 5, but the present invention is not limited to this.

[0071] Furthermore, the present invention can be applied to any modifications within the obvious scope of the above-described embodiments. [Industrial Applicability]

[0072] The communication pipe type circulating filtration device according to the present invention can be used in a water treatment device equipped with a plurality of bathtubs, pools, etc. [Explanation of symbols]

[0073] 1, 2, 1-1, 1-2, 1-3, 2-1, 2-2, 2-3: Bathtub 3, 3-1, 3-2, 3-3: Filtration unit 4: Heating unit 5: Circulation tube 5a: Circulation pipe pump 5b: Circulation pipe flow control valve 6: Level tube 6a: Water level signal 7:Communication pipe 7a, 7b, 7c: Connecting pipe flow control valve (solenoid valve) 8: Refill water tank (water tap) (refill water side) 8a: Make-up water flow control valve (solenoid valve) 9-1: Circulation / drainage branch pipe (circulation branch pipe) 9-1a, 9-1b, 9-1c: Branch pipe flow control valve (solenoid valve) 9-1d: Branch pipe pump 9-2: Circulatory branch pipe 9-2a, 9-2b: Branch pipe flow control valve (solenoid valve) 9-2': Drainage branch pipe 9-2'a: Drainage flow control valve (solenoid valve) 9-2'b: Drainage pump 9-3: Circulation branch pipe 9-3': Drainage branch pipe 9-3'a: Drainage flow control valve (solenoid valve) 9-3'b: Drainage pump 9-4: Drainage branch pipe 9-4a: Drainage flow control valve (solenoid valve) 9-4b: Drainage pump 10: Control circuit 11: Water supply branch pipe 11a, 11b, 11c: Make-up water flow control valve (solenoid valve) 12: Ejector 121: Driving fluid inlet 122: Nozzle 123: Suction fluid inlet 124: Body 125:Discharge fluid outlet 126: Diffuser (mixing section) 1261:Suction part 1262: Compression and boost section 127: Air fluid inlet F1: Driving fluid F2: Suction fluid F3: High speed injection fluid F4:Discharge fluid F5: Air fluid

Claims

1. A plurality of tanks arranged so that the water level is the same; a circulation pipe that connects each lower part of the plurality of tanks to each upper part of the plurality of tanks in a loop; a circulation pipe pump and filtration unit provided in the circulation pipe loop; a level tube for detecting the water level of the plurality of tanks; a communication pipe communicating with the plurality of tanks and the level pipe; A communication pipe type circulation filtration device comprising: a communication pipe type circulation filtration device provided with a circulation branch pipe branching from the communication pipe to the circulation pipe;

2. the filtration unit is provided downstream of the circulation pipe pump; 2. The communication pipe type circulation filtration device according to claim 1, wherein the circulation branch pipe is connected to the circulation pipe downstream of the filtration unit.

3. moreover, a plurality of communicating pipe flow control valves provided on the side of the plurality of tanks and the level pipe in the communicating pipe; a first branch flow control valve and a branch pump connected in series within the circulation branch; Equipped with the communicating pipe flow control valve is opened and the first branch pipe flow control valve is closed to operate the communicating pipe and the level pipe; 3. The communicating pipe type circulation filtration device according to claim 2, wherein at least one of the communicating pipe flow control valves and the first branch pipe flow control valve are opened, and the branch pipe pump is turned on to clean the communicating pipe and the level pipe.

4. moreover, a second branch flow control valve connected between the downstream side of the series connection of the first branch flow control valve and the branch pump and the downstream side of the filtration unit; a third branch pipe flow control valve connected between a downstream side of the series connection of the first branch pipe flow control valve and the branch pipe pump and a drainage facility; Equipped with opening at least one of the communicating pipe flow control valves and the first and second branch pipe flow control valves, closing the third branch pipe flow control valve, and turning on the branch pipe pump to flush the communicating pipe and the level pipe; 4. The communicating pipe type circulation filtration device according to claim 3, wherein at least one of the communicating pipe flow control valves, the first branch pipe flow control valve, and the third branch pipe flow control valve are opened, the second branch pipe flow control valve is closed, and the branch pipe pump is turned on to drain water from the communicating pipe and the level pipe.

5. a makeup water branch pipe that branches off from the communicating pipe toward the makeup water side, is connected to the communicating pipe, and includes a plurality of makeup water flow control valves corresponding to the plurality of communicating pipe flow control valves; 5. The communication pipe type circulation filtration device according to claim 4, wherein at least one of the makeup water flow control valves and the first branch pipe flow control valve are opened, and the branch pipe pump is turned on to flush the communication pipe and the level pipe with makeup water.

6. 2. The communication pipe type circulation filtration device according to claim 1, wherein said circulation branch pipe is connected to the upstream side of said circulation pipe pump.

7. moreover, a plurality of communicating pipe flow control valves provided on the side of the plurality of tanks and the level pipe in the communicating pipe; a third branch flow control valve provided in the circulation branch; Equipped with operating the communicating pipe and the level pipe by opening at least one of the communicating pipe flow control valves and closing the third branch pipe flow control valve; 7. The communication pipe type circulation filtration device according to claim 6, wherein at least one of the communication pipe flow control valves and the third branch pipe flow control valve are opened, and the circulation pipe pump is turned on to clean the communication pipe and the level pipe.

8. Further, a drainage branch pipe is provided which branches off from the communication pipe to a drainage facility and includes a drainage pump and a drainage flow control valve connected in series, opening at least one of the communicating pipe flow control valves and the third branch pipe flow control valve and closing the drain flow control valve to flush the communicating pipe and the level pipe; 8. The communicating pipe type circulation filtration device according to claim 7, wherein at least one of the communicating pipe flow control valves and the drainage flow control valve are opened, the third branch pipe flow control valve is closed, and the drainage pump is turned on to drain the water in the communicating pipe and the level pipe.

9. a makeup water branch pipe that branches off from the communicating pipe toward the makeup water side, is connected to the communicating pipe, and includes a plurality of makeup water flow control valves corresponding to the plurality of communicating pipe flow control valves; 9. The communication pipe type circulation filtration device according to claim 8, wherein at least one of the makeup water flow control valves is opened, the third branch pipe flow control valve is closed, the drain pump is turned on, and the drain flow control valve is opened to flush the communication pipe and the level pipe with makeup water.

10. the filtration unit is provided downstream of the circulation pipe pump; The apparatus further includes an ejector provided between the downstream side of the circulation pipe pump and the filtration unit and connected to the circulation branch pipe, The ejector is a nozzle having a driving fluid inlet for drawing water from the circulation pipe pump as a driving fluid; a body that houses the nozzle and has a suction fluid inlet for drawing water from the circulation branch pipe as a suction fluid into a low-pressure region caused by the driving fluid downstream of the nozzle; a diffuser having a discharge fluid outlet for mixing the driving fluid and the suction fluid and discharging the mixture as a discharge fluid to the filtration unit; 2. The communication pipe type circulation filtration device according to claim 1, comprising:

11. 11. The communication pipe type circulation filtration device according to claim 10, wherein said body is provided with an air fluid inlet for drawing in air fluid, and bubbles are contained in said discharged fluid.

12. 12. The communication pipe type circulation filtration device according to claim 11, wherein the air fluid contains clusters of water molecules gathered around ions generated by plasma discharge.

13. 12. The communication pipe type circulation filtration device according to claim 11, wherein the air fluid is an air fluid containing ozone.

14. a plurality of communicating pipe flow control valves provided on the side of the plurality of tanks and the level pipe in the communicating pipe; a fourth branch flow control valve provided in the circulation branch; Equipped with operating the communicating pipe and the level pipe by opening at least one of the communicating pipe flow control valves and closing the fourth branch pipe flow control valve; 11. The communication pipe type circulation filtration device according to claim 10, wherein at least one of the communication pipe flow control valves and the fourth branch pipe flow control valve are opened, and the circulation pipe pump is turned on to clean the communication pipe and the level pipe.

15. Further, a drainage branch pipe is provided which branches off from the communication pipe to a drainage facility and includes a drainage pump and a drainage flow control valve connected in series, opening at least one of the communicating pipe flow control valves and the fourth branch pipe flow control valve and closing the drain flow control valve to flush the communicating pipe and the level pipe; 15. The communicating pipe type circulation filtration device of claim 14, wherein at least one of the communicating pipe flow control valves and the drainage flow control valve is opened, the fourth branch pipe flow control valve is closed, and the drainage pump is turned on to drain water from the communicating pipe and the level pipe.

16. a makeup water branch pipe that branches off from the communicating pipe toward the makeup water side, is connected to the communicating pipe, and includes a plurality of makeup water flow control valves corresponding to the plurality of communicating pipe flow control valves; 16. The communication pipe type circulation filtration device according to claim 15, wherein at least one of the makeup water flow control valves and the fourth branch pipe flow control valve are closed, and the drain pump is turned on to flush the communication pipe and the level pipe with makeup water.

17. A plurality of tanks arranged so that the water level is the same; a circulation pipe that connects each lower part of the plurality of tanks to each upper part of the plurality of tanks in a loop; a circulation pipe pump and filtration unit provided in the circulation pipe loop; a level tube for detecting the water level of the plurality of tanks; a communication pipe communicating with the plurality of tanks and the level pipe; A communication pipe type circulation filtration device comprising: a drainage branch pipe branching from the communication pipe to a drainage facility; moreover, a plurality of communicating pipe flow control valves provided on the side of the plurality of tanks and the level pipe in the communicating pipe; a drainage branch pipe branching from the communication pipe to a drainage facility and including a drainage pump and a drainage flow control valve connected in series; Equipped with operating the communicating pipe and the level pipe by opening at least one of the communicating pipe flow control valves, closing the drain flow control valve, and turning off the drain pump; Opening at least one of the communication pipe flow control valves and the drain flow control valve, and turning on the drain pump to flush the communication pipe and the level pipe; A communicating pipe type circulation filtration device that opens at least one of the communicating pipe flow control valves and the drainage flow control valve and turns on the drainage pump to drain water from the communicating pipe and the level pipe.

18. a makeup water branch pipe that branches off from the communicating pipe toward the makeup water side, is connected to the communicating pipe, and includes a plurality of makeup water flow control valves corresponding to the plurality of communicating pipe flow control valves; 18. The communication pipe type circulation filtration device according to claim 17, wherein at least one of the makeup water flow control valves and the drainage flow control valve is opened, and the drainage pump is turned on to flush the communication pipe and the level pipe with makeup water.

19. A communication pipe type circulation filtration device having a plurality of communication pipes and a single circulation pipe. each of the communication pipes communicates with a plurality of tanks arranged to have the same water level and with level pipes for detecting the water level of the plurality of tanks; the circulation pipes each have a filtration unit and a circulation pipe pump, and connect each lower part of the tank to each upper part of the tank in a loop; Each of the communicating pipes and the circulation pipe is connected by a single circulation branch pipe, and the water in each of the communicating pipes and each of the level pipes is circulated into the circulation pipe, thereby cleaning the inside of each of the communicating pipes and the level pipe.

20. 20. The communication pipe type circulation filtration device according to claim 19, wherein the circulation branch pipe is connected to the circulation pipe downstream of the filtration unit.

21. 20. The communication pipe type circulation filtration device according to claim 19, wherein the circulation branch pipe is connected to the circulation pipe upstream of the circulation pipe pump.

22. the filtration unit is provided downstream of the circulation pipe pump; The apparatus further includes an ejector provided between the downstream side of the circulation pipe pump and the filtration unit and connected to the circulation branch pipe, The ejector is a nozzle having a driving fluid inlet for drawing water from the circulation pipe pump as a driving fluid; a body that houses the nozzle and has an opening for drawing water from the circulation branch pipe as a suction fluid into a low-pressure region downstream of the nozzle caused by the driving fluid; a diffuser having a discharge fluid outlet for mixing the driving fluid and the suction fluid and discharging the mixture as a discharge fluid to the filtration unit; 20. The communication pipe type circulation filtration device according to claim 19, wherein the circulation branch pipe is connected to the suction fluid port.

23. A communication pipe type circulation filtration device having a plurality of communication pipes and a single circulation pipe. each of the communication pipes communicates with a plurality of tanks arranged to have the same water level and with level pipes for detecting the water level of the plurality of tanks; the circulation pipes each have a filtration unit and a circulation pipe pump, and connect each lower part of the tank to each upper part of the tank in a loop; Each of the communicating pipes and the drainage equipment is connected by a single drainage branch pipe, and a drainage pump is provided in the drainage branch pipe, which cleans the inside of each of the communicating pipes and the level pipes by draining the water from each of the communicating pipes and the level pipes.

24. 24. The communication pipe type circulating filtration device according to claim 23, further comprising a communication pipe and a makeup water side connected by a makeup water branch pipe, and the inside of each communication pipe and each level pipe is cleaned by draining the water from each communication pipe and each level pipe.

25. A communicating pipe type circulation filtration device as described in claim 3, 4, 5, 7, 8, 9, 14, 15, 16, 17 or 18, wherein the flow control valve is replaced with an electromagnetic valve or a manual valve.

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