JP6892994B1 - Constant water level valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant water level valve device capable of reducing the burden of maintenance work. SOLUTION: The constant water level valve device 10 of the present invention is installed outside a water storage tank 1, is connected to a water supply pipe 2, and has a main valve 10A provided with a discharge port 12 for discharging water to a water storage layer 1. It has a sub-valve 10B which is connected to the main valve 10A through a pilot pipe 11 and opens and closes according to the water level in the water tank. The main valve 10A has a valve mechanism for discharging / stopping the water sent from the water supply pipe 2 into the water storage tank 1, and the sub valve 10B has a valve mechanism for discharging the water sent from the pilot pipe 11 into the water storage tank 1. It has a sub-valve main body equipped with an on-off valve that opens and closes a water discharge portion that discharges water inside. The sub-valve main body of the sub-valve 10B is installed outside the water tank by a base member 90 installed in the water tank 1. [Selection diagram] Fig. 1

Description

The present invention relates to a constant water level valve device used to control the water level in a water storage tank such as a water receiving tank or an elevated water tank installed in an office building or condominium.

In the above-mentioned water storage tank, for example, a constant water level valve device as disclosed in Patent Document 1 is installed. Normally, the constant water level valve device is a main valve (sometimes called a water supply valve or a constant water level valve) installed outside the water tank and a sub valve installed inside the water tank to detect the water level. It is a system that supplies water in combination with (sometimes called a ball tap).

Water is supplied to the water tank via a main valve connected to a water pipe, and the water stored in the water tank is sent to a pump for pumping via a water supply pipe and supplied to a predetermined consumption point. It has become so. In this case, the water level of the water stored in the water tank drops as it is consumed. Therefore, the main valve is released as the water is consumed so that a certain amount of water is stored in the water tank. The water level is controlled by supplying water to the inside and closing the main valve when the sub-valve rises to a preset water level.

The auxiliary valve includes a float that floats in the water tank, and when the float drops as the water level in the water tank drops, the on-off valve installed in the auxiliary valve is opened via a link mechanism. Then, the water stored in the pilot pipe connecting the main valve and the sub valve is discharged into the water tank via the on-off valve, which reduces the pressure in the pilot pipe, opens the main valve, and opens the inflow pipe. Water is supplied into the water tank via (discharge pipe). After that, when the water in the water tank rises with the supply of water, the float also rises, the on-off valve is gradually closed via the link mechanism, and when the water level reaches a certain level (water supply stop water level), the on-off valve is completely closed. Close to. At this time, the water filled in the pilot pipe becomes a high pressure state, which closes the main valve and stops the supply of water into the water tank.

Patent No. 60147737

Generally, the auxiliary valve installed in the water tank is made of bronze casting, which has good workability and is more rustproof than iron, but tap water contains chlorine for disinfection. When chlorine for disinfection is vaporized in the water tank, patina is generated in the entire auxiliary valve, which may impair the operation. Further, in order to install the auxiliary valve in the water storage tank, piping using an iron pipe and a stainless steel pipe is required, but rust is generated by the vaporized chlorine gas. Then, in order to prevent such rust, an anticorrosive tape is wrapped around the piping portion, but there is a problem that the surface is hardened and peeled off with the passage of years.
Therefore, in the constant water level valve device in which the auxiliary valve is installed in the water tank, when a person enters the water tank and performs maintenance work (maintenance, inspection work), pay attention to the piping part and the condition of the secondary valve ( It is necessary to pay attention to whether it is damaged or not), and there is a problem that the burden and labor during maintenance work are large.

The present invention has been made by paying attention to the above-mentioned problems, and provides a constant water level valve device capable of reducing the burden of maintenance work in a constant water level valve device that controls the amount of water stored in a water storage tank. The purpose is to do.

In order to achieve the above object, the present invention includes a main valve installed on the surface portion of the upper wall of the water tank, connected to a water supply pipe, and provided with a discharge port for discharging water to the water storage layer, and a pilot. A sub-valve that is connected to the main valve through a pipe and opens and closes according to the water level in the water tank, and a constant water level valve device that the main valve has water sent from the water supply pipe in the water tank. The sub-valve has a valve mechanism for discharging / stopping water, and the sub-valve includes a water discharge unit that discharges water sent through the pilot pipe into a water tank, an on-off valve that opens and closes the water discharge unit, and the pilot. A sub-valve main body provided with a connecting pipe extending in the horizontal direction so that the pipes are connected, and the sub-valve main body is connected to the sub-valve body and floats in the water in the water tank, and the amount of water stored is reduced to a predetermined value or less. When this happens, the on-off valve is opened to lower the internal pressure in the pilot pipe, the valve mechanism of the main valve is opened to discharge the water in the water supply pipe into the water tank, and the water storage amount rises to a constant water level. The water tank has a float that closes the on-off valve to raise the internal pressure in the pilot pipe and closes the valve mechanism of the main valve to stop the discharge of water in the water supply pipe. On the upper wall, a base member composed of an L-shaped plate-shaped member including a substrate mounted on the upper wall and having an opening formed and a holding plate integrally formed on the substrate is installed. The sub-valve main body is installed outside the water tank in a state where the pilot pipe is connected to the connecting pipe protruding from the holding plate and fixed to the holding plate, and is above the water tank. Between the opening formed in the wall and the opening formed in the substrate, a connecting structure including a tubular body for connecting the opening and the opening in a vertically aligned state is provided. The float is connected to a link mechanism that opens and closes the on-off valve, and can move up and down with respect to a guide member that is vertically locked to the end of a connecting member composed of a long lever member. The guide member that is held and vertically locked to the end of the connecting member hangs down into the water tank through the tubular body of the connecting structure .

According to the constant water level valve device having the above configuration, since the auxiliary valve body of the constant water level valve device that controls the amount of water stored in the water tank is installed outside the water tank, it is exposed to chlorine vaporized in the water tank. There is no problem, the operation is not hindered, and the frequency of maintenance and the work load can be reduced. In addition, since the piping connected to the sub-valve is no longer required in the water tank, when a person enters the water tank to perform maintenance work (maintenance, inspection work), pay attention to the piping part or use the sub-valve. It is necessary to pay attention to the situation (whether damage has occurred, etc.), and it is possible to reduce the burden and labor during maintenance work.

According to the present invention, it is possible to reduce the burden of maintenance work in the constant water level valve device that controls the amount of water stored in the water storage tank.

The schematic diagram which shows an example of the water storage tank which installed the constant water level valve device which concerns on one Embodiment of this invention. The perspective view which shows the structure of the auxiliary valve of the constant water level valve apparatus shown in FIG. FIG. 2 is an exploded perspective view of the auxiliary valve shown in FIG. It is a figure explaining the operation of the auxiliary valve, and is the figure which shows the state which the on-off valve is closed (the water supply stop state of a water storage tank). It is a figure explaining the operation of the auxiliary valve, and is the figure which shows the state which the on-off valve is open (the water supply state of a water storage tank). It is a figure which shows the structure of the main valve of the constant water level valve device shown in FIG. 1, and is the figure which shows the state which the valve mechanism is closed (water supply stop state of a water storage tank). It is a figure which shows the structure of the main valve of the constant water level valve device shown in FIG. 1, and is the figure which shows the state which the valve mechanism is open (the water supply state of a water storage tank).

Hereinafter, an embodiment of the constant water level valve device according to the present invention will be described with reference to FIGS. 1 to 7.
As shown in FIG. 1, the constant water level valve device 10 of the present embodiment is installed in a water storage tank 1 formed in a substantially rectangular parallelepiped shape. The water storage tank 1 is installed in an office building, a condominium, or the like, and a manhole 1D that enables maintenance and inspection of the inside is provided on the upper wall 1a. Note that FIG. 1 shows each component of the water storage tank, the constant water level valve device, and the like in an easy-to-understand manner, and does not match the actual size.

The constant water level valve device 10 is used to control the water level of the water stored in the water storage tank 1, and when the water in the water storage tank 1 decreases to a certain value (water supply start set position P1 in FIG. 1), water is supplied. Is started, and when the water supply rises to a certain value (water supply stop set position P2 in FIG. 1), the water supply is stopped. In this case, in order to prevent the float 43 constituting the auxiliary valve described later from being submerged, the water supply is stopped about 60 mm below the water supply stop set position P2.

An overflow pipe is installed in the above-mentioned water storage tank 1. This overflow pipe is arranged so that when the water in the water storage tank 1 exceeds a certain amount (predetermined overflow surface), the water flows out to the outside, and the discharge pipe 200 is placed on the side wall 1b. The hopper 201 is installed by inserting it and bending its end upward. The overflow surface is located at the opening edge 201a of the hopper 201, and when water exceeds the overflow surface, the water is discharged from the hopper 201 to the outside through the discharge pipe 200.

The constant water level valve device 10 of the present embodiment includes a main valve 10A and a sub valve 10B connected by a pilot pipe 11, and these are outside the water tank 1 (in the present embodiment, above the water tank 1). It is installed on the surface of the wall 1a). The main valve 10A is connected to a water supply pipe 2 arranged along the side wall 1b of the water storage tank 1, and water is supplied to the water storage tank 1 via the main valve 10A connected to the water supply pipe 2. , The water stored in the water tank is sent to a pump (not shown) and supplied to a predetermined consumption point. Since the water level of the water stored in the water storage tank 1 drops as it is consumed, the sub-valve 10B is a main valve as the water is consumed so that a certain amount of water is stored. It has a function of releasing 10A and supplying water into the water tank 1.

The main valve 10A includes a discharge pipe (discharge port) 12 extending vertically downward, and the discharge pipe 12 is installed and fixed so as to insert an opening formed in the upper wall 1a of the water storage tank 1. Has been done. Water is supplied to the storage tank 1 through the discharge pipe 12 when the valve mechanism 14 (see FIGS. 6 and 7) arranged in the main valve main body (main valve main body) 10A'is released. ..

Further, the sub-valve 10B has a function of controlling the water level by closing the main valve 10A when the water level of the water in the water storage tank 1 rises to a preset water level. The main body (sub-valve main body) 10B'of the sub-valve includes a water discharge unit (water discharge pipe) 51 that discharges water sent through the pilot pipe 11 into the water storage tank 1, and an on-off valve 41 that opens and closes the water discharge unit 51. (See FIGS. 4 and 5). Further, in the sub valve main body 10B', when the water is suspended in the water in the water storage tank 1 and the amount of water stored becomes equal to or less than a predetermined value, the on-off valve 41 is opened to reduce the internal pressure in the pilot pipe 11. The valve mechanism 14 of the valve 10A is opened, the water in the water supply pipe 2 is discharged into the water storage tank 1 via the discharge pipe 12, and when the water storage amount rises to a constant water level, the on-off valve 41 is closed. A float 43 is connected to increase the internal pressure in the pilot pipe 11 to close the valve mechanism 14 of the main valve 10A and stop the discharge of water in the water supply pipe 2.

Specifically, when the float 43 floating in the water storage tank 1 drops as the water level in the water storage tank drops, it is installed in the sub valve via a link mechanism 60 provided in the sub valve main body 10B'. The on-off valve 41 is opened. Then, the water stored in the pilot pipe 11 connecting the main valve 10A and the sub valve 10B is discharged into the water tank via the on-off valve 41 and the water discharge portion 51, whereby the pressure in the pilot pipe decreases. The main valve 10A (valve mechanism 14) is opened, and water is supplied into the water tank through the discharge port 12 of the main valve 10A. After that, when the water in the water storage tank 1 rises with the supply of water, the float 43 also rises, gradually closing the on-off valve 41 via the link mechanism 60, and reaching a constant water level (water supply stop water level). The on-off valve 41 is completely closed. At this time, the water filled in the pilot pipe 11 becomes a high pressure state, which closes the main valve 10A (valve mechanism 14) and stops the supply of water into the water storage tank.

Here, the configuration of the auxiliary valve 10B will be described with reference to FIGS. 2 to 5.
The sub-valve main body 10B'has a cylindrical connecting pipe 50 extending horizontally so that the pilot pipe 11 is connected, and a vertical connecting pipe 50 extending vertically so as to discharge water flowing in through the connecting pipe 50. It is provided with a spouting portion (cylindrical spouting pipe) 51. In the internal space between the connecting pipe 50 and the water discharge portion 51, for example, the on-off valve 41 that reciprocates (moves back and forth) in the horizontal direction is arranged. The on-off valve 41 includes a valve body 45, and the valve body 45 (packing 45a of the valve body 45) abuts against the valve seat (seat surface) 45b formed inside the auxiliary valve body 10B'. It has become like.

The sub-valve main body 10B'is provided with a cylindrical portion 45c integrally with the valve seat 45b, and water sent through the connecting pipe 50 is discharged through the internal space (flow path) of the cylindrical portion 45c. It is designed to flow into 51. The valve body 45 is fixed to the spindle 46 by a fixing nut member 47, and moves to the left side (rear side) together with the spindle from the state shown in FIG. 5 to abut against the valve seat 45b, and the connection pipe 50 and the water discharge portion 51. It becomes a closed state (closed position; see FIG. 4) that cuts off the communication state with the valve seat 45b, and by moving to the right side (front side) from the state shown in FIG. It is in an open state (release position; see FIG. 5).

One end of the spindle 46 protrudes from the opening of the cap 48 attached to the cylindrical portion 45c, and the link mechanism 60 is provided at the protruding portion. A spring 48a is arranged between the cap 48 and the valve body 45, and the valve body 45 is always urged to come into contact with the valve seat 45b. Further, the other end of the spindle 46 projects into a cylinder chamber 49 provided in the sub-valve main body 10B', and the spindle 46 slides in the cylinder chamber 49 with a V ring 54a interposed therebetween. The piston 54 to be used is attached by the tightening nut 55.

The spindle 46 is formed with a small hole for maintaining the cylinder chamber 49 at atmospheric pressure. Further, in the present embodiment, a differential pressure method having an area ratio of 1: 1.4 or more is adopted for the valve body 45 and the piston 54, and once the closed state (see FIG. 4) is reached, the piston 54 Since the area of the valve body 45 is larger than the area of the valve body 45, the force acting in the closing direction exceeds the weight of the weight 86 attached to the guide member 82 (guide rope) described later, and the weight of the weight 86 causes the valve body. 45 is prevented from opening.

The on-off valve 41 described above is driven in the front-rear direction (left-right direction in the figure) between the closed position and the released position by the following driving body. In this case, the drive body has a link mechanism 60 that is connected to the on-off valve 41 and displaces the on-off valve (valve body 45) between the closing position and the releasing position, and a connecting member 80 (for example,) connected to the link mechanism 60. , A long lever member) and a guide member 82 locked so as to hang vertically from the end of the connecting member 80. The float 43 is attached to the guide member 82. It is held so that it can move up and down along 82.

Here, the configuration of the link mechanism 60 will be described.
The link mechanism 60 includes a plurality of first to fourth arm members 61, 64, 66, 68 that are rotatably supported by each other, and the fourth arm member 68 is connected to the guide member 82. The second arm member 64 is connected to an on-off valve 41 (specifically, a spindle 46 that supports the on-off valve 41).

The first arm member 61 is rotatably supported by a bracket 69 composed of a pair of opposing support plates fixed to the upper end surface of the auxiliary valve main body 10B'. Specifically, the rear end of the first arm member 61 is positioned between the pair of support plates of the bracket 69 and has a substantially T-shaped (or substantially Y-shaped) screw 62 (hereinafter, all the screws have the same shape). It is rotatably supported by). Further, one end (upper end) of the second arm member 64 is rotatably supported by the front end of the first arm member 61. Specifically, the second arm member 64 is sandwiched between the bifurcated support portions 61a at the front end of the first arm member 61 and rotatably supported by the screws 63.

Further, the intermediate portion of the second arm member 64 is rotatably supported by the front end of the spindle 46. Specifically, the second arm member 64 is formed by a pair of support plates 64a joined to each other, and these support plates 64a are separated from each other and formed in an intermediate portion of the second arm member 64. The front end of the spindle 46 is inserted into the opening, and the second arm member 64 is rotatably supported by the screw 65 with respect to the inserted spindle 46.

Further, the other end (lower end) of the second arm member 64 is rotatably supported by the front end of the third arm member 66. Specifically, the third arm member 66 is composed of a pair of opposing support plates 66a, and the third arm member 64 is sandwiched between these support plates 66a by a screw 67 at the other end of the second arm member 64. It is rotatably supported by the arm member 66 of the above. Further, the rear end of the third arm member 66 is rotatably supported by a screw 69 at the upper end of the fourth arm member 68 located so as to be sandwiched between the support plates 66a. Further, the intermediate portion of the fourth arm member 68 is rotatably supported by the screw 71 with respect to the bracket 70 having a U-shaped cross section extending from the water discharge portion 51. That is, the on-off valve 41 is connected to the link mechanism 60 configured as described above, and is driven in the left-right direction by the floating operation of the float 43 via the link mechanism 60.

The drive body provided with the link mechanism 60 described above includes the guide member (guide rope) 82 and the float 43 that hang down from the tip of the connecting member 80 connected to the fourth arm member 68 of the link mechanism 60 toward the water. Further, it is provided above and below the guide member 82, and is provided with a pair of stoppers 83 and 84 that regulate the vertical position of the float 43 that moves up and down. The lower stopper 84 has a function of setting a water supply start position, and the upper stopper 83 has a function of setting a water supply stop position.

The floating float 43 movably held by the guide member 82 has a certain weight and can move up and down between the upper stopper 83 and the lower stopper 84 (stopper 84a for adjustment). It is arranged (floatably). Specifically, the float 42 is formed in a hollow spherical shape, and the guide member 82 is passed through a through hole penetrating through the center of the float 42, so that the float 42 is between the upper stopper 83 and the lower stopper 84. It is held movable. The internal space of the float 43 accommodates a weighted body such as sand or a weight that is smaller than the buoyancy of the float 42, and the float 43 has a constant weight.

In the above-mentioned drive body, when the water level in the water storage tank 1 drops and the float 43 hits the stopper 84, the tip of the connecting member 80 is gradually added to the weight of the weight 86 attached to the lower end of the guide member 82. The weight of the float 43 is also added, and the tip end side of the connecting member 80 is rotated downward. In this case, when the connecting member 80 rotates downward, the spindle 46 opposes the urging force of the spring 48a via the link mechanism 60 described above, and as shown in FIGS. 4 to 5, on the right side in the drawing. It is driven so that the on-off valve 41 is opened. Further, when the water level in the water tank 1 rises and the float 43 hits the stopper 83, the spindle 46 is driven to the left side in the drawing by the urging force of the spring 48 as shown in FIGS. 5 to 4. As a result, the on-off valve 41 is closed.

The upper stopper 83 and the lower stopper 84 (stopper 84a for adjustment) described above are configured so that their positions can be adjusted with respect to the guide member 82, and the float 43 can freely float in a floating range in the vertical direction. It can be specified. As described above, in the present embodiment, the upper stopper 83 is fixed to the guide member 82 at a position corresponding to the water supply stop position of the water tank 1, while the lower stopper 84 is located at the water supply start position of the water tank 1. It is fixed to the guide member 82 at the corresponding position. In this case, by adjusting the mounting positions of the stoppers 83 and 84, the water supply start position and the water supply stop position can be arbitrarily set, and the structure of the water storage tank 1 and the adjustment of residual chlorine can be adjusted. It can be changed as appropriate.

In the sub-valve 10B configured as described above, the sub-valve main body 10B'is installed outside the water storage tank 1 by the base member 90 installed in the water storage tank 1.
The base member 90 of the present embodiment is installed on the upper wall portion of the water storage tank 1, and the opening 90a formed so as to coincide with the opening 1A formed on the upper wall 1a of the water storage tank 1. It is configured as an L-shaped plate-shaped member including a substrate 90A mounted on the upper wall 1a and a holding plate 90B integrally formed on the substrate 90A and holding the auxiliary valve main body 10B'. ..

Regarding the opening 1A formed in the upper wall 1a, if it is the existing water storage tank 1, it is possible to newly form it as an opening for attachment after the fact in order to attach the auxiliary valve 10B. Alternatively, normally, the water storage tank 1 is obliged to install an alarm device so that an early detection in the event of a water leakage accident or the like is possible, and an opening formed for installing this alarm device is provided. It can also be used as an opening for attaching the auxiliary valve, and the auxiliary valve can be easily installed.
Specifically, the alarm device operates when the water level reaches a predetermined position (full water alarm position) within the range between the water supply stop set position P2 and the position (overflow surface) of the opening edge 201a of the hopper 201. It functions to issue an alarm to the outside when the water level exceeds the full water alarm position.

In this case, the alarm device includes, for example, two electrode rods (not shown), one electrode rod is installed in the water of the water tank 1, and the other electrode rod is placed at a predetermined full water alarm position. By positioning and installing so as to be, when the water level rises and reaches the other electrode rod, the alarm device is energized and is configured to issue an alarm to the outside. In the present embodiment, the opening 90a of the base member 90 described above is aligned by using the opening 1A for installing the electrode rod of such an alarm device, and the electrode mounting seat 1B formed in the opening 1A is formed. The base member 90 is attached by using it.

Hereinafter, the attachment structure of the auxiliary valve 10B to the base member 90 and an installation example will be described.
The sub-valve 10B (sub-valve main body 10B') is installed on the holding plate 90B portion of the base member 90. A circular opening 90b is formed in the holding plate 90B, and the connection pipe 50 is inserted through this portion, and a nut 95 is screwed into the protruding portion so that the auxiliary valve main body 10B'is connected to the holding plate 90B. Be retained. Further, the end of the pilot pipe 11 is fixed to the end of the connecting pipe 50 protruding from the holding plate 90B by tightening the nut 96 with the ring member 97 interposed therebetween.

A connecting member 80 extending in the horizontal direction is attached to the sub-valve main body 10B', and a guide member 82 on which the float 43 is arranged hangs down from the tip of the connecting member. Since the guide member 82 hangs down through the opening 90a formed at the end of the substrate 90A and the opening 1A of the water storage tank, the water discharge portion (water discharge pipe) 51 of the sub valve main body 10B'is opened and closed. A connected discharge structure is provided for discharging the water in the pilot pipe 11 into the water storage tank 1 when the valve 41 is opened.

This connected discharge structure is configured by, for example, forming an opening 51a on the side surface of the water discharge portion 51, attaching a water discharge member 100 to this portion, and connecting a hose 102 to the water discharge member 100. The tip of the hose 102 is inserted into the opening 90a of the substrate 90A, and when the on-off valve 41 opens, the water in the pilot pipe 11 is discharged into the water storage tank 1.

A connecting structure 100 for connecting the two is provided between the opening 90a of the substrate 90A and the opening 1A of the water storage tank 1.
The connecting structure 100 has a tubular body 108 that is inserted through the opening 90a and tightened and fixed by a nut 105 on the surface of the substrate 90A, and a connecting tubular body 110 that is fitted and screwed into the tubular body 108. There is. Then, the lower end of the connecting tubular body 110 is fitted into the electrode mounting seat 1B which is fastened and fixed by the nut 112 via the sealing material 111 to the opening 1A formed in the upper wall 1a of the water storage tank 1. As a result, the opening 90a of the substrate 90A and the opening 1A of the water tank 1 are in a vertically aligned state, and the guide member 82 locked to the tip of the connecting member 80 is inside the water tank. It hangs down on.

With the configuration of the base member 90 described above, the sub valve 10B is installed outside the water storage tank 1 (above the upper wall), and the sub valve 10B is connected to the main valve 10A via the pilot pipe 11. That is, in the sub-valve 10B, the float 43 and the guide member 82 are only present in the water storage tank, and the sub-valve main body 10B'is not arranged in the water storage tank.
In this case, by unitizing the base member 90 and the sub-valve main body 10B', it is possible to improve the efficiency of the installation work on the water storage tank. Further, a casing (not shown) may be installed so as to cover the main valve 10A and the sub valve 10B installed above the upper wall 1a. In particular, the auxiliary valve is preferably covered with a casing or the like because the driven link mechanism 60 and the connecting member 80 are exposed to the outside.

As described above, the main valve 10A has a valve mechanism 14 disposed in the main valve main body 10A', and when the valve mechanism 14 is released, the water in the water supply pipe 2 is discharged from the discharge pipe 12. When the valve mechanism 14 is closed, the water discharge is stopped. The valve mechanism 14 is driven to open and close by changing the internal pressure of the pilot pipe 11 described above. The structure of such a main valve is generally known, and the schematic configuration of the main valve of the present embodiment will be described below with reference to FIGS. 6 and 7.

The main valve main body 10A'is formed with a connecting portion 2A connected to the water supply pipe 2, a connecting portion 11A to which the pilot pipe 11 is connected, and a connecting portion 12A to which the discharge pipe 12 is connected. .. The valve mechanism 14 includes a valve body 132 provided on the lower end side of the spindle 130 arranged in the central portion, and a piston 134 provided on the upper end side of the spindle 130, and the inside thereof is the piston. It is divided into a cylinder chamber S1 and a cylinder chamber S2 by 134. In this case, the piston 134 seals the cylinder chamber S1 and the cylinder chamber S2 with the V ring 134a, and the small hole 134b is formed in the piston 134 so that water flows from the cylinder chamber S2 to the cylinder chamber S1. There is.

The cylinder chamber S1 is connected to the pilot pipe 11 via a communication passage 140, and the cylinder chamber S2 is connected to the water supply pipe 2 by disposing a cylinder lid 135 provided with a check valve 136. It is separated from the space portion S3 to be formed. The spindle 130 is arranged so as to move up and down through the guide hole of the cylinder lid 135. Further, the check valve piece 136a is provided with a check valve piece 136a to prevent water hammer.

The area ratio of the valve body 132 and the piston 134 is set to 1: 1.4 or more, and the valve body 132 is opened and closed by utilizing this differential pressure. Specifically, when the internal pressure of the pilot pipe 11 is high (when the amount of water in the water storage tank 1 is sufficient), as shown in FIG. 6, the piston 134 is pushed down by the internal pressure acting on the cylinder chamber S1. , The valve body 132 closes the discharge pipe 12 (connection portion 12A).

The amount of water in the water storage tank 1 decreases, and the internal pressure of the pilot pipe 11 decreases accordingly, which is higher than the internal pressure acting on the space S3 (internal pressure acting by the water in the water supply pipe 2). When it becomes low, water flows from the space portion S3 into the cylinder chamber S2 via the check valve 136, presses the piston 134, and pushes up the spindle 130. At this time, the valve body 132 opens, the water in the space S3 flows into the discharge pipe 12, and the water is supplied into the water storage tank 1 (see FIG. 7).

In this state, a part of the water that has flowed into the cylinder chamber S2 flows into the pilot pipe 11 through the small hole 134b formed in the piston 134. The water that has flowed into the pilot pipe 11 flows into the water tank via the hose 102 until the auxiliary valve 10B is closed.

Then, when the float 43 rises and the on-off valve 41 of the auxiliary valve 10B is closed, the water in the pilot pipe 11 stops flowing (internal pressure increases), and the internal pressure of the cylinder chamber S1 also increases. The pressure becomes the same as that of the cylinder chamber S2, and the piston 134 descends due to the flow pressure applied to the valve body 132 and the weight of the piston 134. At this time, the check valve piece 136a built in the check valve 136 descends when the cylinder chamber S1 and the cylinder chamber S2 have the same pressure, the inflow of water into the cylinder chamber S2 gradually stops, and the water passes through the small hole 134b. It only flows into the cylinder chamber S1 through the cylinder chamber S1. As the amount of water in the cylinder chamber S2 gradually decreases, the piston 134 and the valve body 132 also gradually lower to close the valve mechanism, so that the water hammer phenomenon is prevented.

According to the constant water level valve device 10 configured as described above, since the sub-valve 10B is not installed in the water storage tank 1, it is not exposed to the vaporization of chlorine, and in particular, the sub-valve is made of bronze casting. When it is formed, problems such as malfunction due to rust of patina can be solved. Specifically, compared to the conventional sub-valve, which had a useful life of about 3 to 4 years, the useful life is 10 years or more, which reduces the frequency of entering the water tank and performing maintenance work, and is hygienic. Become a target. In addition, since it is not necessary to install a pipe for the auxiliary valve in the water storage tank, maintenance work can be easily performed. Further, since the auxiliary valve is not installed inside the water storage tank, it is possible to secure a large range of vertical movement of the float 43, and it is possible to secure a larger detection difference of the water level than before.

Although the embodiments of the present invention have been described above, the present invention can be appropriately modified in addition to the above-described embodiments. Since the present invention is characterized in that the auxiliary valve constituting the constant water level valve device is installed outside the water storage tank, the specific structure of the main valve and the auxiliary valve is limited to the above-described embodiment. There is no such thing, and it can be deformed in various ways. In addition, the location where the main valve and sub-valve are installed and the configuration of the base member that holds the sub-valve can be appropriately modified, and these can be modified by appropriately modifying the arrangement of the water supply pipe and pilot pipe. It can be appropriately deformed, such as by installing it on the side wall of a water storage tank.

1 Water tank 2 Water supply pipe 10 Constant water level valve device 10A Main valve 10B Sub valve 11 Pilot pipe 43 Float 60 Link mechanism 90 Base member

Claims (4)

A main valve installed on the surface of the upper wall of the water tank, connected to a water supply pipe and having a discharge port for discharging water to the water storage layer, and a main valve connected to the main valve through a pilot pipe, in the water tank. A sub-valve that opens and closes according to the water level, and a constant water level valve device that has it.
The main valve has a valve mechanism for discharging / stopping the water sent from the water supply pipe into the water storage tank.
The sub-valve is
A water discharge unit that discharges water sent through the pilot pipe into a water tank, an on-off valve that opens and closes the water discharge unit, and a connection pipe that extends horizontally so that the pilot pipe is connected. The main body of the auxiliary valve equipped and
When the water is connected to the sub-valve main body and floats in the water in the water storage tank and the amount of water stored becomes equal to or less than a predetermined value, the on-off valve is opened to reduce the internal pressure in the pilot pipe to reduce the valve of the main valve. The mechanism is opened to discharge the water in the water supply pipe into the water storage tank, and when the amount of water stored rises to a constant water level, the on-off valve is closed to increase the internal pressure in the pilot pipe to increase the valve mechanism of the main valve. With a float that closes and stops the discharge of water in the water supply pipe,
Have and
The upper wall of the water tank is a base composed of an L-shaped plate-shaped member including a substrate mounted on the upper wall and having an opening formed, and a holding plate integrally formed on the substrate. The parts are installed,
The sub-valve main body is installed outside the water storage tank in a state where the pilot pipe is connected to the connecting pipe protruding from the holding plate and fixed to the holding plate.
Between the opening formed in the upper wall of the water storage tank and the opening formed in the substrate, a tubular body for connecting the opening and the opening in a vertically aligned state is provided. A connecting structure is provided,
The float is connected to a link mechanism for opening and closing the on-off valve, and is held so as to be vertically movable with respect to a guide member vertically locked to the end of a connecting member composed of a long lever member. Ori,
A constant water level valve device characterized in that a guide member vertically locked to an end portion of the connecting member hangs down in the water storage tank through a tubular body of the connecting structure. The first aspect of claim 1, wherein stoppers capable of changing the range of vertical movement of the float are provided above and below the guide member, and the water supply stop position and the water supply start position can be adjusted. Constant water level valve device. The opening formed in the upper wall of the water tank is provided with an electrode mounting seat for detecting that the amount of water stored in the water tank has reached the full water alarm position.
The constant water level valve device according to claim 1 or 2, wherein a tubular body having the connecting structure is mounted on the electrode mounting seat. The constant water level valve device according to any one of claims 1 to 3, wherein the base member and the auxiliary valve main body are unitized.

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