Abnormal pressure display device

Abstract

To provide an abnormal pressure display device that operates normally over an extended period of time.SOLUTION: An abnormal pressure display device 1 comprises: a flow path penetration part 2 that branches from a main flow path U51 through which fluid passes and leads to the outside; a piston part 3 that is disposed within the flow path penetration part 2 and provided to be movable in the axial direction; a biasing part 4 that generates biasing force to keep the piston part 3 at a fixed position in the axial direction in equilibrium with a normal pressure when the interior of the main flow path is at the set normal pressure; and a fixing part 5 that is attachable and detachable to / from the piston part 3 and keeps the piston part 3 immovable at the fixed position in the axial direction when attached.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an abnormal pressure display device for use in water pipes and the like. [Background technology]

[0002] For example, there exists an abnormal pressure display device that is used together with a pressure reducing valve to detect and display an abnormal increase in pressure in a fluid path (for example, as described in Patent Document 1). The device described in Patent Document 1 has a built-in spring. In this configuration, the device is designed to operate at all times. As a result, the spring is constantly subjected to a load according to the pressure in the fluid path, and therefore the spring is prone to deterioration over time, which may result in the device no longer operating normally. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-81759 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide an abnormal pressure display device that operates normally for a long period of time. [Means for solving the problem]

[0005] The present invention is an abnormal pressure indication device comprising: a flow path penetration portion branching off from a main flow path through which a fluid passes and leading to the outside; a piston portion disposed within the flow path penetration portion and arranged to be movable in the axial direction; a biasing portion that generates a biasing force that balances with the normal pressure to keep the piston portion at a constant axial position when the inside of the main flow path is at a set normal pressure; and a fixing portion that is detachable from the piston portion and keeps the piston portion immobile at a constant axial position when attached.

[0006] According to the above-mentioned configuration, when the abnormal pressure display is not functioning, the fixing portion can keep the piston portion immovable at a fixed position.

[0007] In addition, the piston portion can be removed to the outside of the abnormal pressure display device, and by removing the piston portion, a secondary flow path can be formed in the flow path penetration portion, through which fluid branching off from the main flow path can flow.

[0008] According to the above-described configuration, for example, a pressure gauge can be attached to the passage penetrating portion to measure pressure through the sub passage and to perform water drainage.

[0009] Further, a support part is provided in the flow passage penetrating part for supporting the piston part and the biasing part at a set position, the axial position of the support part is adjustable in the flow passage penetrating part, and a position maintaining part for maintaining the adjusted position is removably provided in the support part, and the piston part can be prevented from being moved in at least one axial direction by application of an external force when the position maintaining part is attached, but can be made possible by removing the position maintaining part from the support part.

[0010] According to the above-described configuration, by detaching the position retaining portion from the support portion and forcibly moving the piston portion by applying an external force, it is possible to prevent the piston portion from sticking due to precipitation of dissolved components in the fluid or the like.

[0011] Further, a support portion that supports the piston portion and the biasing portion is provided at the flow passage penetrating portion, and the fixing portion can be attached by being screwed into the support portion.

[0012] According to the above configuration, the structure of the fixing portion is simple because of the screw type. Effect of the Invention

[0013] In the present invention, the fixing portion keeps the piston portion immovable in a fixed position, making it difficult for the biasing portion to deteriorate over time, thereby allowing the abnormal pressure indication device to operate normally for a long period of time. [Brief description of the drawings]

[0014] [Figure 1] 1 is a front view of a meter unit including an abnormal pressure display device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a partial cross-sectional view showing the abnormal pressure display device. [Diagram 3] FIG. 4 is a partial cross-sectional view showing the abnormal pressure display device with a fixing part removed (in the case of normal pressure). [Figure 4] FIG. 4 is a partial cross-sectional view showing the abnormal pressure display device in a state where a fixing part is removed (in the case of abnormal pressure (high pressure)). [Diagram 5] 10 is a partial cross-sectional view showing a case where a piston portion is forcibly moved with a fixing portion attached in the abnormal pressure display device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] First, an embodiment of the abnormal pressure display device 1 according to the present invention will be described. For convenience, the directions described below are expressed in the directions shown in the figure, but the abnormal pressure display device 1 of this embodiment can also be used in a 90 degree horizontal or oblique orientation with respect to the direction shown in the figure, so the direction can change depending on the installation situation. Therefore, the directions are not limited to those described below.

[0016] The abnormal pressure display device 1 of this embodiment is used, for example, by being incorporated into a meter unit U shown in Fig. 1. The meter unit U is installed, for example, in a meter box of an apartment building or the like, and is used to supply tap water at an appropriate pressure to each household. The meter unit U mainly comprises a base portion U1, an on-off valve U2, a pressure reducing valve U3, a water meter U4, and a secondary side member U5. The water meter U4 is incorporated into the meter unit U at the installation site. The abnormal pressure display device 1 is provided on the secondary side of the meter unit U, downstream of the water meter U4.

[0017] The abnormal pressure display device 1 of this embodiment is formed in a secondary side member U5. The lower part of the secondary side member U5 is fixed to the base part U1 by screws or the like. A main flow path U51, through which a fluid (tap water, etc.) passes, extends in the left-right direction in the secondary side member U5. The left end of the main flow path U51 is configured to be connected to a water meter U4, and the right end of the main flow path U51 is configured to be connected to a secondary side water piping. A check valve U52 for preventing backflow is incorporated in the main flow path U51.

[0018] The abnormal pressure display device 1 mainly comprises a flow passage penetrating portion 2, a piston portion 3, a biasing portion 4, and a fixing portion 5, and additionally comprises a position maintaining portion 6.

[0019] The flow passage penetrating part 2 is a part having a flow passage that branches off from the main flow passage U51 and leads to the outside of the meter unit U (secondary side member U5). In this embodiment, the axial direction (which coincides with the up-down direction) of the flow passage penetrating part 2 is perpendicular to the axial direction of the main flow passage U51. The flow passage penetrating part 2 in this embodiment is composed of two separate members, a base part 21 and a support part 22.

[0020] The base 21 is integrally formed with the main body of the secondary member U5 and is formed in a tubular shape extending in the vertical direction with the axial direction (vertical direction) being linear. In this embodiment, the base 21 is cylindrical. A female screw 211 is formed on the inner circumference of the base 21.

[0021] The support part 22 is a part that supports the piston part 3 and the biasing part 4. The support part 22 is cylindrical, and a male thread 221 is formed on the outer periphery of the lower part, and the support part 22 is attached to the base part 21 by screwing it into the female thread 211 of the base part 21. The piston part 3 is supported by the flow passage penetration part 2 that combines the base part 21 located below and the support part 22 located above. The support part 22 supports the piston part 3 and the biasing part 4 at set positions.

[0022] An axially intermediate portion of the support portion 22 protrudes radially outward. This portion is a tool engagement portion 222, and although not shown, its cross-sectional shape is hexagonal like that of a bolt head, and a tool such as a wrench can be engaged with this portion when the support portion 22 is rotated axially relative to the base portion 21.

[0023] A male thread 223 is formed on the outer peripheral surface of the upper part of the support part 22. The fixing part 5 can be attached by screwing into this part. Furthermore, a through hole 224 through which the piston part 3 can pass in the axial direction is provided in the upper part of the support part 22. This through hole 224 allows the piston part 3 to move upward relative to the support part 22, as shown in FIG. 4.

[0024] The piston portion 3 is disposed within the flow passage penetrating portion 2. More specifically, a lower portion of the piston portion 3 is disposed within the base portion 21, and a portion above the middle portion is disposed within the support portion 22. The piston portion 3 is provided so as to be movable in the axial direction (up and down direction) relative to the flow passage penetrating portion 2 (the base portion 21 and the support portion 22). The piston portion 3 in this embodiment is a substantially cylindrical body having a circular cross-sectional shape.

[0025] In the piston portion 3, the flange portion 31 is formed so as to protrude in the radially outward direction. As shown in FIG. 3, the flange portion 31 is disposed between the upper surface 212 at the step portion of the passage penetrating portion 2 and the lower end surface 225 of the support portion 22, and the flange portion 31 is in contact with the respective surfaces 212, 225 (for example, in the state shown in FIG. 4), thereby restricting the axial movement range of the piston portion 3. This movement range can be adjusted by the degree of screwing of the support portion 22 into the base portion 21. In this embodiment, the flange portion 31 is provided over the entire circumferential direction, but may be formed intermittently. In this embodiment, the flange portion 31 is integral with the main body of the piston portion 3, but may be, for example, a pin inserted into the main body of the piston portion 3 or a ring (retaining ring) fixed to the outer periphery of the piston portion 3.

[0026] In the piston portion 3, below the flange portion 31, a recessed groove 32 is formed around the entire circumference, and an O-ring 33 is fitted into this recessed groove 32. This prevents the fluid from flowing above the O-ring 33 in the flow passage penetrating portion 2.

[0027] A pressing portion 34 is provided at the upper end of the piston portion 3. The pressing portion 34 is a screw-shaped member separate from the main body of the piston portion 3, and the shaft portion is embedded in the upper end portion of the main body. The abnormal pressure display device 1 can be integrated with the piston portion 3 configured in this manner, facilitating maintenance such as replacement. A ring-shaped display portion 35 is provided below the head of the pressing portion 34 so as to surround the shaft portion. The display portion 35 is separate from the pressing portion 34, and can be colored a different color from the surrounding members, such as adjacent members, so that the protruding state from the support portion 22 shown in FIG. 4 can be made noticeable.

[0028] When the inside of the main flow path U51 is at a preset normal pressure, the biasing unit 4 generates a biasing force that is in balance with the normal pressure and keeps the piston portion 3 at a fixed axial position. A coil spring is used for the biasing unit 4. Note that the type of spring is not particularly limited, and various springs that can generate a biasing force in the axial direction can be used.

[0029] Here, the operation of the relevant parts when displaying abnormal pressure will be described. In each state shown in Fig. 3 and Fig. 4, the fixing part 5 (described in detail later) is removed. Fig. 3 shows the normal state. In this state, the spring force of the biasing part 4 is set to be greater than the pressure of the fluid applied to the lower end of the piston part 3 (the set normal pressure). Furthermore, the lower surface of the head of the pressing part 34 abuts against the upper end surface of the support part 22, so that the piston part 3 is immobile in the axial direction.

[0030] On the other hand, FIG. 4 shows a state of abnormal pressure where the fluid pressure is higher than the normal pressure. Abnormal pressure occurs, for example, due to a malfunction of the pressure reducing valve. The fluid pressure (abnormal pressure) acting on the lower end of the piston portion 3 compresses the biasing portion 4, causing the piston portion 3 to move upward. This causes the holding portion 34 and the display portion 35 to protrude from the upper end surface of the support portion 22. The protruding display portion 35 (and holding portion 34) makes it possible to see at a glance that the main flow path U51 is under abnormal pressure. In this way, the abnormal pressure can be displayed. In this manner, in this embodiment, the display portion 35 functions as an "indicator" that allows abnormal pressure to be visually confirmed.

[0031] Next, the fixing part 5 is detachable from the piston part 3. When attached, the fixing part 5 keeps the piston part 3 immovable at a fixed axial position. In this embodiment, the fixing part 5 is attached by screwing it into the support part 22. That is, the fixing part 5 of this embodiment is indirectly attached to the piston part 3. The fixing part 5 is a cylindrical body with a closed upper end, and is cap-shaped with a female thread 51 formed on the inner surface. When attached, the inner surface of the upper end of the fixing part 5 abuts against the upper end surface of the pressing part 34.

[0032] In the abnormal pressure display device 1 configured as described above, when the abnormal pressure display function is not enabled, the fixing part 5 keeps the piston part 3 immovable in a fixed position. By keeping the piston part 3 immovable in a fixed position, the biasing part 4 is less likely to deteriorate over time, allowing the abnormal pressure display device 1 to operate normally for an extended period of time.

[0033] Here, the piston portion 3 can be removed to the outside of the abnormal pressure display device 1. Specifically, in the flow passage penetrating portion 2, the support portion 22 is removed from the base portion 21, and the piston portion 3 can be removed from the base portion 21 of the flow passage penetrating portion 2 accordingly. By removing the piston portion 3, a sub-flow passage is formed in the flow passage penetrating portion 2, through which a fluid branched off from the main flow passage U51 can flow. The sub-flow passage is a flow passage that utilizes the space from which the piston portion 3 is removed. For example, a pressure gauge can be attached to this flow passage penetrating portion 2 to measure pressure via the sub-flow passage or to drain water. The pressure gauge can be attached by utilizing the female thread 211 provided on the inner peripheral surface of the base portion 21.

[0034] The support part 22 is adjustable in its axial position in the flow passage penetrating part 2. A position retaining part 6 that retains the adjusted position is removably provided on the support part 22. The position retaining part 6 is sandwiched between the upper end surface of the base part 21 in the flow passage penetrating part 2 and the lower end surface of the tool engaging part 222 of the support part 22. Although not shown, the position retaining part 6 has, for example, a C-shaped or U-shaped cross section, and can be removed from the attached position by moving it in a direction perpendicular to the axial direction (horizontal direction).

[0035] By removing the position retaining part 6, a space corresponding to the thickness dimension (axial dimension) of the position retaining part 6 is generated between the base 21 and the tool engaging part 222 of the support part 22, and by using the tool engaging part 222, the support part 22 can be moved downward by turning it in the screw tightening direction relative to the base 21, and moved upward by turning it in the loosening direction (see the arrow R in FIG. 5 for the rotation of the support part 22). At this time, the fixing part 5 may be attached or removed. In other words, the piston part 3 cannot be moved in at least one direction of the axial direction by applying an external force to the piston part 3 when the position retaining part 6 is attached, but can be moved by removing the position retaining part 6 from the support part 22. Therefore, by removing the position retaining part 6 from the support part 22 and forcibly moving the piston part 3 by applying an external force, it is possible to prevent the piston part 3 from being fixed due to the precipitation of dissolved components (calcium components, etc.) in the fluid. By periodically performing this operation, the function of the abnormal pressure display device 1 can be maintained for a long period of time.

[0036] Although the embodiments of the present invention have been described above, the present invention is not limited to the above examples, and various modifications can be made without departing from the gist of the present invention.

[0037] For example, in this embodiment, the fluid passed through the meter unit U is tap water, but this is not limited to this, and may be various other types of fluid.

[0038] Furthermore, it is not essential to use the abnormal pressure display device 1 in combination with the pressure reducing valve U3. For this reason, for example, it can be installed in a flow path provided with a booster pump, and can also be used to detect a pressure rise due to water hammer.

[0039] The abnormal pressure indication device 1 may be provided upstream (on the primary side) of the water meter U4. The base 21 and the support 22 of the flow passage penetrating part 2 are not limited to being connected by screws, and other connection methods such as fitting may be used, provided that separation of the support 22 from the base 21 is not hindered.

[0040] Moreover, the biasing portion 4 can have various configurations as long as it is a means for generating a biasing force, and therefore can have a configuration other than a spring.

[0041] Moreover, the fixing part 5 in the above embodiment is indirectly attached to the piston part 3. However, the fixing part 5 may be directly attached to the piston part 3. For example, a wedge-shaped body may be attached to the piston part 3. Moreover, the fixing part 5 is not limited to being cap-shaped, and may have various shapes.

[0042] Also, it is possible not to provide the position retaining portion 6. In this case, a gap may be provided between the base 21 and the tool engaging portion 222 of the support portion 22, or the base 21 and the tool engaging portion 222 may be brought into close contact with each other and then moved so that a gap is created between the base 21 and the tool engaging portion 222 during the work of preventing adhesion.

[0043] In the above embodiment, the display unit 35 functions as an "indicator" of abnormal pressure. However, the present invention is not limited to this, and the head of the pressing unit 34 may be colored to function as an "indicator." In this case, the display unit 35 does not need to be provided, and may be used in combination with the pressing unit 34. [Explanation of symbols]

[0044] 1. Abnormal pressure display device 2 Flow passage penetration 21 Base 211 Female thread 22 Support part 221 Male thread 222 Tool engaging part 223 Male thread 224 Through hole 3 Piston section 31 Flange 32 Groove 33 O-ring 34 Clamp 35 Display section 4. Pressurizing section 5 Fixed part 6 Position holding part U Meter unit U5 Secondary member U51 Main channel

Claims

1. A flow path penetrating portion that branches off from a main flow path through which a fluid passes and leads to the outside; a piston portion disposed within the flow passage penetrating portion and axially movable; a biasing portion that generates a biasing force that maintains the piston portion at a constant axial position in equilibrium with a set normal pressure inside the main flow path when the pressure inside the main flow path is a set normal pressure; and a fixing portion that is detachable from the piston portion and keeps the piston portion immovable at a constant axial position when attached.

2. The piston portion can be removed to the outside of the abnormal pressure display device, The abnormal pressure indication device according to claim 1 , wherein a sub-flow passage through which a fluid branched off from the main flow passage can flow is formed in the flow passage penetrating portion by removing the piston portion.

3. a support portion that supports the piston portion and the biasing portion at set positions is provided in the flow passage penetrating portion, The support portion is capable of adjusting an axial position in the flow passage penetrating portion, A position holding part that holds an adjusted position is detachably provided on the support part, 2. The abnormal pressure display device as described in claim 1, wherein movement of the piston portion in at least one axial direction by application of an external force is prevented when the position maintaining portion is attached, and is made possible by removing the position maintaining portion from the support portion.

4. a support portion that supports the piston portion and the biasing portion is provided in the flow passage penetrating portion, The abnormal pressure display device according to claim 1 , wherein the fixing portion is attached by being screwed into the support portion.

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