Water supply device and check valve for the same

Abstract

To reduce, not only a space required for a device, but also water supply loss in a flow path.SOLUTION: A housing 101A comprises: pumps (first pump, second pump) that boost a pressure of flowing water; and check valves (first check valve, second check valve) that are connected to flow paths of the pumps, form flow paths in a horizontal direction and a vertical direction continuing to the horizontal direction, and have a pipe 402A in which a check valve cartridge 401, which is a backflow prevention mechanism, is arranged in the flow paths. The check valves have a structure in which the check valve cartridge 401 is provided in the horizontal flow path relative to the pipe 402A on the flow paths, and the horizontal flow path is bent back from the rear of the check valve cartridge 401 to form the vertical flow path in an approximately S-shape.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a water supply device and a check valve thereof. [Background technology]

[0002] Conventionally, there is a direct water supply type booster water supply device in which a housing section consisting of a stand and a drip-proof pump cover houses components such as a pump device equipped with a motor, valves, piping, accumulators, and a control panel.

[0003] A commonly known configuration for this type of water supply system is one in which a check valve is placed between the discharge port of each pump device and the discharge side junction pipe to prevent the fluid pressurized by the other pump operating from flowing back (for example, Patent Document 1).

[0004] In the case of such water supply equipment, since the main body of the equipment is installed in a variety of environments such as outdoors, in a pump room, or in the space under stairs, it is generally designed to be weather-resistant to the natural environment and to save space based on the installation environment. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-94514 A Summary of the Invention [Problem to be solved by the invention]

[0006] On the other hand, due to the recent increase in electricity prices and the growing need for environmentally friendly measures such as carbon neutrality, it is necessary to achieve both low loss and high efficiency in water supply. In the case of Patent Document 1, the flow path has a connecting pipe structure that bends and extends downward in an inverted L shape, so the flowing water falls directly downward. Furthermore, since the connecting pipe structure is a shape that protrudes in an inverted L shape toward the horizontal direction, it is difficult to reduce the space of the device body, and there is a concern about loss in water supply.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned background, and aims to provide a water supply device and a check valve thereof that can not only reduce the space of the entire device but also reduce water supply losses in the flow path. [Means for solving the problem]

[0008] One aspect of the water supply device of the present invention that solves the above-mentioned problems is a water supply device comprising a housing, a pump installed in the housing for increasing the pressure of flowing water, and a check valve installed in the housing and forming a horizontal flow path downstream of the pump and a vertical flow path continuing from the horizontal direction, and having a backflow prevention mechanism installed on the flow path to prevent backflow of the flowing water, wherein the check valve has the backflow prevention mechanism disposed in the horizontal flow path, a horizontal turn is provided downstream of the backflow prevention mechanism, and a flow path extending in the vertical direction from the turn is formed.

[0009] Furthermore, one aspect of the check valve of a water supply system of the present invention is a check valve of a water supply system having a pump, characterized in that a backflow prevention mechanism for preventing backflow is arranged in a horizontal flow path downstream of the pump, the horizontal turn is provided downstream of the backflow prevention mechanism, and a flow path extending vertically from the turn is formed. Effect of the Invention

[0010] According to the present invention, it is possible to provide a water supply device and a check valve thereof which are capable of reducing the space required for the entire device as well as reducing loss of water supply in the flow path. [Brief description of the drawings]

[0011] [Figure 1] 1 is a front view showing a water supply device according to a first embodiment of the present invention. [Diagram 2] 1 is a three-sided view showing a check valve of a water supply apparatus according to a first embodiment of the present invention. [Diagram 3] 1 is a side cross-sectional view showing a side surface of a check valve according to a first embodiment of the present invention. [Figure 4]1 is a cross-sectional view showing a cross section in a flow path direction of a pipe in a check valve according to a first embodiment of the present invention. [Diagram 5] FIG. 4 is an explanatory graph showing loss reduction by the water supply device according to the first embodiment. [Figure 6] 11 is a three-sided view showing a check valve of a water supply apparatus according to a second embodiment of the present invention. FIG. [Figure 7] 11 is a cross-sectional side view showing a side of a check valve of a water supply apparatus according to a second embodiment of the present invention. FIG. [Figure 8] 11 is a three-sided view showing a check valve of a water supply apparatus according to a third embodiment of the present invention. FIG. [Figure 9] 11 is a side cross-sectional view showing the side of a check valve of a water supply apparatus according to a third embodiment of the present invention. FIG. [Figure 10] FIG. 11 is a cross-sectional view showing an air vent hole of a check valve according to a third embodiment of the present invention. [Figure 11] 11 is a three-sided view showing a check valve of a water supply apparatus according to a third embodiment of the present invention. FIG. [Figure 12] 11 is a side cross-sectional view showing the side of a check valve of a water supply apparatus according to a fourth embodiment of the present invention. FIG. [Figure 13] FIG. 11 is a cross-sectional view showing an air vent hole of a check valve according to a fourth embodiment of the present invention. [Figure 14] 11 is a three-sided view showing a check valve of a water supply apparatus according to a fifth embodiment of the present invention. FIG. [Figure 15] 11 is a side cross-sectional view showing the side of a check valve of a water supply apparatus according to a fifth embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following description and drawings are merely examples for explaining the present invention, and appropriate omissions and simplifications have been made to clarify the explanation. The present invention can also be embodied in various other forms. As will be described later, each embodiment of the present invention is provided with a No. 1 check valve and a No. 2 check valve, and when the term "check valve" is used, this refers to the No. 1 check valve and the No. 2 check valve in each embodiment. Embodiment 1

[0013] Hereinafter, a water supply device equipped with a check valve according to a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a front view showing the water supply device according to the first embodiment. For simplicity of explanation, a front door is not shown. In the water supply device 101, each unit for supplying water to its housing 101A is arranged.

[0014] In the first embodiment, the check valves (No. 1 check valve 111A, No. 2 check valve 112A) are important components, so the following description will focus on the check valves installed downstream of the pumps (No. 1 pump 106, No. 2 pump 107) in the casing 101A on the water supply flow path. Therefore, detailed descriptions of each part in the casing 101A other than the No. 1 check valve 111A and No. 2 check valve 112A will be omitted.

[0015] First, a brief description will be given of each unit arranged in housing 101A. As shown in Fig. 1, water supply device 101 is composed of housing frame (pump housing) 102 that supports the entire device, control frame 104 that is installed on housing frame 102 and that houses control unit 103, unit section 105 that is a unit device housed in housing frame 102, and control unit 103 that controls the equipment of unit section 105 such as the pump.

[0016] The unit section 105 includes a No. 1 pump 106, a No. 2 pump 107, a pressure reducing backflow preventer 108, a pressure tank 109, a bypass pipe 110, a No. 1 check valve 111A, a No. 2 check valve 112A, a suction gate valve 113 (suction direction 113a), a discharge elbow 114 (discharge direction 114a), a suction pressure sensor 115, a discharge pressure sensor 116, a suction junction pipe 201, and a discharge junction pipe 301.

[0017] 1, two pumps are provided, namely No. 1 pump 106 and No. 2 pump 107, but at least one pump may be provided. In unit section 105, the internal fluid flows from suction gate valve 113 to pressure reducing backflow preventer 108, suction junction pipe 201, No. 1 pump 106 or No. 2 pump 107, No. 1 check valve 111A or No. 2 check valve 112A, discharge junction pipe 301, and discharge bent pipe 114. Here, when the inflow pressure is sufficiently high, the fluid is supplied to the demand destination via bypass pipe 110 without passing through the pumps (No. 1 pump 106, No. 2 pump 107).

[0018] The control unit 103 is housed in a control frame 104 installed on the top of the housing frame 102, and mainly includes an earth leakage breaker, an inverter, a control board, and other electronic devices. In the water supply device 101, pressure values ​​obtained from a suction pressure sensor 115 and a discharge pressure sensor 116 are input to the control board, and the inverter is controlled to operate the pump at a variable speed.

[0019] One end of the suction junction pipe 201 is connected to a pressure reducing backflow preventer 108. The pressure reducing backflow preventer 108 is provided between the suction junction pipe 201 and the suction gate valve 113. The pressure reducing backflow preventer 108 has a function of restricting the flow direction of the liquid in the flow path to one direction. A relief valve portion 117 is provided at the bottom of the pressure reducing backflow preventer 108.

[0020] The relief valve portion 117 extends downward from the pressure-reducing backflow preventer 108. A water leakage detection electrode may be provided at the drain outlet at the lower end of the relief valve portion 117. The water leakage detection electrode detects water leakage from the pressure-reducing backflow preventer 108. The detected water leakage signal can be sent to the water leakage detection board.

[0021] The suction junction pipe 201 is connected to the secondary side of the pressure reducing backflow preventer 108. The suction junction pipe 201 is arranged horizontally below, for example, two pumps, No. 1 pump 106 and No. 2 pump 107. The suction junction pipe 201 is connected to the No. 1 pump 106 and the No. 2 pump 107 via suction side lift valves, respectively.

[0022] Specifically, suction junction pipe 201 has openings 204 and 205 extending upward integrally therewith in order to connect to a pump disposed vertically, and suction side lift valves are disposed at the nodes where the central axes of the openings intersect with the horizontal axis of suction pipe 201. The lower parts of the suction side lift valves that face openings 204 and 205 can be removed during assembly and maintenance work.

[0023] The No. 1 check valve 111A and the No. 2 check valve 112A have one end connected to pump discharge ports 122 and 123 arranged on the side walls of the No. 1 pump 106 and the No. 2 pump 107, respectively. The No. 1 check valve 111A and the No. 2 check valve 112A have piping 402A in their flow paths that extends forward (horizontally) from the pump discharge ports 122 and 123, respectively, and then bends and extends downward (vertically). The lower ends of the No. 1 check valve 111A and the No. 2 check valve 112A in their flow paths are connected to discharge junction pipe 301 provided below, via discharge-side lift valves, respectively.

[0024] Specifically, as shown in Fig. 1, discharge junction pipe 301 has a first discharge opening 304 and a second discharge opening 305 that extend upward to connect to primary check valve 111A and secondary check valve 112A that are arranged vertically. A discharge lift valve is arranged at the node where the central axis of the opening of this discharge junction pipe 301 and the horizontal axis of the suction junction pipe 201 intersect.

[0025] The No. 1 suction side lift valve and the lower part of the No. 2 suction side lift valve facing the No. 1 discharge opening 304 and the No. 2 discharge opening 305 can be removed during assembly and maintenance work. In addition, the lower part of each discharge side lift valve is connected to a curved pipe 114 that discharges liquid that has flowed into the discharge side junction pipe 301. Opening and closing the lift valve body allows water to pass, stops water to pass, and changes the flow direction.

[0026] The suction junction pipe 201 and the discharge junction pipe 301 each have an opening extending downward at their intermediate portions, i.e., bypass connection portions 206, 306, to which a bypass pipe is connected. In addition, a bypass check valve 124 is disposed in the bypass pipe 110 on the side close to the discharge junction pipe 301.

[0027] Next, the No. 1 check valve 111A and the No. 2 check valve 112A will be described in detail with reference to Figures 2, 3, and 4. Figure 2 is a three-sided view showing a check valve of a water supply system according to embodiment 1 to which the present invention is applied, Figure 3 is a side cross-sectional view showing the side (direction E) of the check valve according to embodiment 1 to which the present invention is applied, and Figure 4 is a cross-sectional view showing a cross section in the flow path direction of the piping in the check valve of embodiment 1 to which the present invention is applied.

[0028] Here, since the No. 1 check valve 111A and the No. 2 check valve 112A have the same configuration, the No. 1 check valve 111A will be described as a representative. As shown in Fig. 2, the No. 1 check valve 111A is aligned with the center line Ch1 in the horizontal direction and the center line Cv1 in the vertical direction, with the shape seen from above shown in (a), the shape seen from the front shown in (b), and the shape seen from the side (direction E) shown in (c).

[0029] The No. 1 check valve 111A is composed of, for example, a check valve cartridge 401 that is detachable from a check valve body 402, a check valve body 402, a check valve inlet joint 403, an O-ring 404, an air vent cock 405, etc. The check valve cartridge 401, which is a backflow prevention mechanism, is equipped with a spring-type valve body 401b, and is held horizontally by the check valve body 402.

[0030] This valve body 401b has a spring type structure rather than a swing type structure, which not only enables it to flexibly prevent backflow against the force of flowing water, but also prevents the occurrence of water hammer, which poses the risk of backflow.

[0031] In this embodiment 1, a check valve cartridge 401, which requires installation space, is installed on the horizontal flow path of a pipe 402A, and the check valve body 402 curves and turns back from the rear of the horizontal flow path, and from that turn, the flow path is connected vertically, resulting in a structure of the check valve body 402 (piping 402A).

[0032] The main material of the check valve cartridge 401 is POM (Polyoxymethylene) resin, and the seal portion 401c between the case 401a and the valve body 402b is provided with NBR (Nitril Butadiene Rubber).

[0033] The check valve body 402 includes a holding portion 402a for the check valve cartridge 401, and a substantially S-shaped pipe 402A that discharges the secondary flow of the check valve cartridge 401 and leads it to the junction pipe 301. Specifically, the No. 1 check valve 111A has a structure in which the pipe 402A is bent so as to turn back in the horizontal direction from the upstream side extending in the horizontal direction to the downstream side extending vertically downward, so that the cross-sectional shape in the flow path direction is curved to be a substantially S-shape.

[0034] An upper half 402b of the bent portion that is deflected downward in the secondary flow of the check valve cartridge 401 forms a substantially conical flow passage centered on the inflow center line O1, and has a tapered structure.

[0035] As the flow area from this approximately conical flow path in the upstream direction widens toward the downstream direction, the flow speed of the water increases and the water is discharged from the check valve without stagnation. The shape of the flow path is such that the cross section of the lower half 402c becomes approximately semicircular as shown in Figure 4 from the cross section in the direction of the semicircular cross section position shown in Figure 3, and gradually communicates with the check valve inlet 407 which opens circularly.

[0036] The bending center O3 of the check valve body 402 extends to a position facing the check valve inlet 406 with respect to the outflow center O2. A flow path is formed between the bending center O3 and the outflow center O2 so as to smoothly communicate with each other. In the embodiment, the cross-sectional area of ​​the cross section of the lower half 402c of the bent portion increases from the cross section of the check valve inlet 407 to the cross section of the bent portion, resulting in a decelerating flow. That is, in the No. 1 check valve 111A, the pipe 402A has a structure in the vertical direction, i.e., in the vertical (downward) flow path, in which the inner diameter is enlarged from the rear of the tapered, approximately conical structure.

[0037] The expansion angle 2θ calculated from the streamline length and the cross-sectional area equivalent circle diameter, which are the expansion index of the cross-sectional area, is, for example, most preferably 8 to 10°, and is at most 20° or less. In addition, the cross section from the cross section of the lower half 402c of the bent portion to the check valve inlet 407 may be an accelerating flow with a smaller cross-sectional area, and the cross section from the cross section of the lower half 402c of the bent portion to the check valve inlet 407 may be a constant speed flow with the same cross-sectional area.

[0038] The upper half 402b of the bent portion, which is located at the highest position in the entire flow path of the water supply device, is provided with an air vent cock attachment 408 and an air vent cock 405, which are necessary when operating the pump. One end of the downstream side of the check valve body 402 is approximately umbrella-shaped so that it can be connected to the discharge junction pipe 301 with a ferrule.

[0039] Moreover, one upstream end of the check valve body 402 is provided with a threaded portion for connecting a check valve inlet joint 403 to the outer periphery of the cylindrical portion that holds the check valve cartridge 401. The check valve inlet joint 403 guides the flow flowing out from the pump discharge ports 122, 123 to the check valve cartridge 401, and holds the check valve cartridge 401 held in the check valve body 402 so that it cannot move. The O-ring 404 has the role of squeezing and sealing the water. In this embodiment 1, the cross-sectional area from the cross section of the check valve inlet joint 403 to the check valve inlet joint outlet 409 is smaller, resulting in an accelerating flow.

[0040] In the case of a decelerating flow in which the cross-sectional area increases from the cross section of the check valve inlet joint 403 to the check valve inlet joint outlet 409, the expansion angle 2θ calculated from the streamline length, which is an index of the expansion of the cross-sectional area, and the cross-sectional area equivalent circle diameter is, for example, best 8 to 10°, and at most 20°. The cross section from the cross section of the check valve inlet joint 403 to the check valve inlet joint outlet 409 may be a uniform velocity flow with the same cross-sectional area.

[0041] One end of the check valve inlet joint 403 upstream from the pump discharge ports 122, 123 is substantially umbrella-shaped so as to be ferrule-connected to the pump discharge ports 122, 123. In addition, one end of the check valve inlet joint 403 downstream has a threaded portion for connection to a check valve body 402 that holds a check valve cartridge 401.

[0042] The check valve body 402 and the check valve inlet joint 403 are made of CAC911, which has low lead leaching when in contact with working fluid such as tap water. Other materials such as stainless steel and materials that have been treated to prevent lead leaching may also be used.

[0043] In the water supply device 101 equipped with a check valve configured as described above, in pumps 106, 107 with a vertical rotation axis and a horizontal pump discharge, the check valve cartridge 401 is arranged horizontally to effectively utilize the space in the height direction, and the check valve body 402 is made approximately S-shaped to effectively utilize the space in the direction of the inflow center O1. Furthermore, despite the same installation dimensions as conventional devices, a check valve volume larger than conventional devices is provided, resulting in a highly efficient water supply device with reduced pressure loss.

[0044] In addition, by making the check valve into a cartridge, it is possible to minimize the maintenance man-hours and materials used in the event of malfunctions caused by foreign matter or aging. By making the check valve cartridge 401 a spring-loaded valve body 401b, when the pump operation suddenly stops due to a power outage or abnormality detection, the valve opening gradually decreases according to the flow rate, and the valve becomes fully closed, thereby suppressing water hammer.

[0045] The bent portion upper half 402b is made substantially conical, which suppresses separation of the flow caused by unnecessary area expansion of the check valve cartridge secondary flow, thereby reducing loss. The bent portion lower half 402c has a substantially semicircular cross-sectional shape, which maximizes the flow path area within the check valve installation space, suppresses an increase in flow velocity, and reduces friction loss. Furthermore, the expansion angle when flowing down to the check valve inlet 407 can also be suppressed, which reduces expansion loss.

[0046] Both ends of the No. 1 and No. 2 check valves 111A and 112A are connected with ferrules, making them easy to install and remove, and improving assembly and maintainability. In addition, by using lead-free bronze CAC911 and POM resin as the materials, it is possible to suppress the leaching of harmful substances into the tap water being supplied, improving the reliability of the water supply.

[0047] Here, the loss reduction by the water supply apparatus of the present embodiment 1 will be described with reference to Fig. 5. Fig. 5 is a graph for explaining the loss reduction by the water supply apparatus of the present embodiment 1. As shown in Fig. 5, a graph is shown with the pressure loss on the vertical axis and the flow rate on the horizontal axis, with the solid line indicating the pressure loss at each flow rate of a conventional check valve and the dashed line indicating the pressure loss at each flow rate of the check valve of the first embodiment.

[0048] Here, pressure loss will be taken as an example to explain the loss. There is a tendency for pressure loss to increase with an increase in flow rate, but in the case of this embodiment 1, it can be seen that the pressure loss can be reduced to 1 / 5 of that of the conventional type at a flow rate of 100%. Note that this graph is only an example, and the values ​​will vary depending on conditions such as the water supply device and the size of the check valve, but the fact remains that a significant reduction effect can be achieved.

[0049] Here, in the first embodiment, expressions such as horizontal and vertical are used to describe the flow path of the check valve, but this does not mean that the shape of the check valve body is not inclined at all in the horizontal or vertical direction, but rather that the piping of the check valve body is arranged along the horizontal and vertical directions. Of course, the check valve may have a structure in which the piping is completely horizontal and vertical.

[0050] As described above, according to the first embodiment, the check valve has a piping structure in which the flow path from the primary side to the secondary side is curved back in the horizontal direction and descends vertically, forming a roughly S-shaped shape. This allows the horizontal installation dimensions of the housing to be kept small when connecting the check valve to the housing. This allows the configuration and arrangement of the check valve to suppress interference with the housing, frame, and other units, making it possible to reduce the space required for the entire water supply device 101.

[0051] In addition, the check valve has a roughly S-shaped piping structure from the upstream to the downstream of the flow path, and the diameter of the piping, i.e., the flow path area, is enlarged vertically downstream, which makes it possible to reduce the loss of water supply in the flow path while ensuring an appropriate flow path area on the secondary side. In this way, it is possible to simultaneously achieve space saving and suppression of various losses in the water supply.

[0052] Here, the individual effects of various loss suppression will be explained. Since the check valve cartridge of the first embodiment is disposed upstream of the check valve, it is possible to increase the size of the valve body. As a result, it is possible to realize pressure suppression of the flowing water. In addition, since the check valve cartridge is disposed horizontally relative to the check valve body, the structure of the check valve itself contributes to space saving.

[0053] In such a space-saving configuration, the approximately conical shape provided upstream of the check valve prevents unnecessary area expansion in the flow path, making it possible to suppress separation loss of the flowing water, and furthermore, by making the flow path of the check valve approximately S-shaped to ensure the flow path area, it becomes possible to suppress friction loss of the flowing water.

[0054] Next, a second embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 6 is a three-sided view showing a check valve of a water supply apparatus according to a second embodiment of the present invention, and Figure 7 is a side cross-sectional view showing the side (direction E) of the check valve of a water supply apparatus according to a second embodiment of the present invention. Hereinafter, explanations and illustrations of symbols will be omitted for configurations similar to those of the first embodiment, and similar numbers will be used in the explanation.

[0055] As a representative of the No. 1 and No. 2 check valves, the No. 1 check valve 111B will be used as an example to explain the check valves, as shown in Figure 6. As shown in Figure 6, the No. 1 check valve 111B is aligned with the center line Ch2 in the horizontal direction and the center line Cv2 in the vertical direction, with the shape viewed from above shown in (a), the shape viewed from the front in (b), and the shape viewed from the side (direction E) in (c).

[0056] 7, the No. 1 check valve 111B of the second embodiment has a downstream end of a check valve body 402 which is a screw-in joint, and an extension adapter 410 is provided between the check valve body 402 and the discharge-side junction pipe 301. The upstream end of the extension adapter 410 has a screw portion so as to be connectable to the check valve body 402, and is provided with an extension O-ring. The downstream end of the extension adapter 410 is substantially umbrella-shaped so as to be connectable to the pump discharge ports 122, 123 with a ferrule.

[0057] As described above, according to the second embodiment, the installation dimensions of the check valve can be easily changed by the configuration including the above-mentioned extension adapter 410. Therefore, installation can be performed without any problems even if the pump discharge port height changes due to a difference in the number of pump impeller stages according to customer specifications. In other words, it is possible to flexibly respond to pump specifications (size, etc.). In this way, there is no need to stock a variety of different sizes of check valve bodies, which not only improves production efficiency during the manufacturing process but also reduces the number of parts. Embodiment 3

[0058] Next, embodiment 3 of the present invention will be described with reference to Figures 8, 9 and 10. Figure 8 is a three-sided view showing a check valve of a water supply apparatus according to embodiment 3 to which the present invention is applied, Figure 9 is a side cross-sectional view showing the side (direction E) of the check valve of a water supply apparatus according to embodiment 3 to which the present invention is applied, and Figure 10 is a cross-sectional view showing an air vent hole of the check valve according to embodiment 3 to which the present invention is applied.

[0059] Hereinafter, for configurations similar to those in the first embodiment, the illustration of the explanatory symbols will be omitted, and similar numbers will be used in the description. Regarding the check valves, as shown in Fig. 8, the No. 1 check valve 111C will be described as an example representing the No. 1 and No. 2 check valves. As shown in Fig. 8, the No. 1 check valve 111C is aligned with the center line Ch3 in the horizontal direction and the center line Cv3 in the vertical direction, and the shape as seen from above is shown in (a), the shape as seen from the front in (b), and the shape as seen from the side (E direction) in (c). Note that Fig. 10 shows the cross-sectional shape in the flow path direction.

[0060] 9, the No. 1 check valve 111C has an air vent mounting hole 408 and an air vent cock 405 on the side surface of the cylindrical portion that holds the check valve cartridge 401 of the check valve body 402. This is because it is desirable to vent air by providing the air vent cock 405 on the primary side, i.e., upstream side, rather than on the secondary side, i.e., downstream side, of the check valve 111C.

[0061] 9 and 10, the No. 1 check valve 111C forms an air vent flow passage 411A between the side wall of the check valve cartridge 401 and the check valve cartridge 401 as a substantially semicircular groove on the side surface of the cylindrical portion that communicates with the air vent mounting hole 408 and allows air AR1 to pass through. This forms a passage for venting air from the pump to the outside inside the check valve body 402. Here, the shape is substantially semicircular, but the cross-sectional shape may be substantially circular and is not limited to this.

[0062] The check valve inlet joint 403 has, for example, four protrusions on its surface facing the check valve cartridge 401. These protrusions form a gap between the check valve cartridge 401 and the check valve body 402, forming a flow path that communicates with the air vent flow path 411A of the check valve body 402. The check valve cartridge 401 is also provided with a primary-side O-ring 404 as a primary-side water seal and a secondary-side O-ring 404 as a secondary-side water seal.

[0063] As described above, according to the third embodiment, an air vent flow path is formed by a groove provided between the check valve body 402 and the check valve cartridge 401, so that air can be easily vented from the primary side of the check valve. Therefore, compared to the first embodiment, the air inside the pump can be vented in a shorter time and the pump can be filled with water. This improves the efficiency of water injection or priming.

[0064] Next, a fourth embodiment of the present invention will be described with reference to Figures 11, 12 and 13. Figure 11 is a three-sided view showing a check valve of a water supply apparatus according to a fourth embodiment of the present invention, Figure 12 is a side cross-sectional view showing the side of the check valve of a water supply apparatus according to a fourth embodiment of the present invention, and Figure 13 is a cross-sectional view showing an air vent hole of the check valve according to the fourth embodiment of the present invention. Note that Figure 13 shows the cross-sectional shape with respect to the flow path direction.

[0065] Hereinafter, explanations of configurations similar to those in the first and third embodiments will be omitted, and similar numbers will be used in the explanations. Regarding the check valves, as a representative of the No. 1 and No. 2 check valves, the No. 1 check valve 111D will be explained as an example, as shown in Fig. 11. As shown in Fig. 11, the No. 1 check valve 111D is aligned with the center line Ch4 in the horizontal direction and the center line Cv4 in the vertical direction, and the shape as seen from above is shown in (a), the shape as seen from the front in (b), and the shape as seen from the side (E direction) in (c).

[0066] 12 and 13, the No. 1 check valve 111D is provided with an air vent mounting hole 408 and an air vent cock 405 on the side surface of the cylindrical portion of the check valve body 402 that holds the check valve cartridge 401. Also, as shown in Fig. 13, the side surface of the cylindrical portion of the check valve body 402 is provided with an air vent flow path 411B having a substantially circular cross-sectional structure that communicates with the air vent mounting hole 408 and serves as a hole through which air AR2 passes. This forms a passage inside the check valve body 402 for venting air from the pump to the outside. The surface of the check valve inflow fitting 403 that faces the check valve cartridge 401 is provided with, for example, four protrusions.

[0067] This convex portion creates a gap between the check valve cartridge 401 and forms a flow path that communicates with the air vent flow path 411B of the check valve body 402. Also, the check valve cartridge 4011 is provided with a primary side O-ring 404 as a primary side water seal.

[0068] As described above, according to the fourth embodiment, by forming an air vent flow path in the check valve body itself, air can be vented from the check valve primary side (upstream side). Therefore, air inside the pump can be vented in a shorter time than in the first embodiment, and the pump can be filled with water. This makes it possible to improve the water injection efficiency or priming efficiency. Furthermore, since the number of sealed water points can be reduced compared to the third embodiment, manufacturability and reliability can be improved.

[0069] Next, the fifth embodiment of the present invention will be described with reference to Figs. 14 and 15. Fig. 14 is a three-sided view showing a check valve of a water supply apparatus according to the fifth embodiment of the present invention, and Fig. 15 is a side cross-sectional view showing the side of the check valve of a water supply apparatus according to the fifth embodiment of the present invention. Hereinafter, for configurations similar to those of the first embodiment, the illustration of the explanatory symbols will be omitted, and similar numbers will be used in the description. Regarding the check valve, as a representative of the first and second check valves, the No. 1 check valve 111E will be described as an example, as shown in Figs. 14 and 15. As shown in Fig. 14, the No. 1 check valve 111E is shown in (a) with its shape seen from above, (b) with its shape seen from the front, (a) with its shape seen from the front, and (c) with its shape seen from the side (E direction), aligned with the center line Ch5 in the horizontal direction and the center line Cv5 in the vertical direction.

[0070] 15, one end of the check valve inlet joint 403 on the pump discharge side is provided with a flange 500 that can be bolted, and one end on the check valve cartridge side is provided with a threaded portion as in embodiment 1. One end of the check valve body 402 on the discharge junction pipe side is provided with a flange 500 that can be bolted, and one end on the check valve cartridge side is provided with a threaded portion as in embodiment 1.

[0071] As described above, according to the fifth embodiment, the check valve can be bolted to the flange 500, like the No. 1 check valve 111E. Therefore, it can be manufactured at a lower cost than the other embodiments, improving the economic efficiency. In particular, since the check valve is configured to be replaceable, the flange 500 makes the replacement work easier, which increases the usefulness.

[0072] Furthermore, according to each of the above-described embodiments, the valve body is made replaceable by the check valve cartridge, which clearly contributes to reducing material costs as well as enabling the check valve itself to be reused from the perspective of the SDGs (Sustainable Development Goals).

[0073] While preferred embodiments of the present invention have been described and illustrated, it should be understood that they are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0074] 101 Water supply equipment 101A Housing 106 No. 1 Pump 107 No. 2 Pump 111A No. 1 check valve 111B No. 1 check valve 111C No. 1 check valve 111D No. 1 check valve 111E No. 1 check valve 112A No. 2 check valve 112B No. 2 check valve 112C No. 2 check valve 112D No. 2 check valve 112E No. 2 check valve 122 Pump outlet 123 Pump outlet 304 Discharge opening 305 Discharge opening 401 Check valve cartridge 401a Case 401b Valve body 401c Seal part 402 Check valve body 402a Holding part 402A Piping 402b Upper half of bent part 402c bent lower half 403 Check valve inlet joint 404 O-ring 405 Air vent valve 406 Check valve inlet 407 Check valve outlet 408 Air vent cock mounting hole 409 Check valve inlet joint outlet 410 Extension adapter 411A Air vent passage 411B Air vent channel 500 flange

Claims

1. A water supply device comprising: A housing and A pump installed in the housing for increasing the pressure of the running water; A check valve is installed in the housing, forms a horizontal flow path and a vertical flow path continuing from the horizontal direction at a downstream stage of the pump, and has a backflow prevention mechanism installed in the flow path to prevent backflow of running water; Equipped with The water supply device is characterized in that the check valve has a backflow prevention mechanism arranged in the horizontal flow path, a horizontal turn is provided downstream of the backflow prevention mechanism, and a flow path extending in the vertical direction from the turn is formed.

2. 2. The water supply apparatus according to claim 1, wherein said check valve is formed to have a substantially S-shaped cross section relative to the direction of said flow path.

3. 2. The water supply device according to claim 1, wherein the check valve has a substantially conical structure in the horizontal flow path such that a flow area decreases downstream of the backflow prevention mechanism.

4. In the water supply device described in claim 3, the check valve has a structure in which the flow area expands from the rear of the approximately conical structure on the vertical flow path.

5. 2. The water supply device according to claim 1, further comprising a detachable extension adapter provided at a connecting portion between said housing and the vertical end of said check valve.

6. 2. The water supply apparatus according to claim 1, wherein said check valve has an air passage provided above said backflow prevention mechanism for allowing air to flow from said pump to the outside.

7. 2. The water supply device according to claim 1, further comprising a detachable flange provided at a connecting portion between said housing and an end portion of said check valve in a horizontal direction.

8. 8. The water supply apparatus according to claim 1, wherein the backflow prevention mechanism is structured so as to be detachable from the check valve.

9. A check valve for a water supply system having a pump, A check valve for a water supply system, characterized in that a backflow prevention mechanism for preventing backflow is arranged in a horizontal flow path downstream of the pump, the horizontal turn is provided downstream of the backflow prevention mechanism, and a flow path extending vertically from the turn is formed.

10. 10. The check valve for a water supply apparatus according to claim 9, wherein the check valve is formed to have a substantially S-shaped cross section in the flow path direction.

11. 10. The check valve for a water supply system according to claim 9, wherein a rear stage of the backflow prevention mechanism is formed in a substantially conical shape in the horizontal flow path so that a flow area of ​​the backflow prevention mechanism is reduced.

12. 12. The check valve for a water supply apparatus according to claim 11, wherein the check valve is formed in a shape such that the water flow area expands from the rear of the approximately conical structure on the vertical flow path.

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