JPH04160320A - Liquid amount detector - Google Patents

Abstract

PURPOSE:To correctly measure only a hot fluid by providing a stopper means serving also as a temperature sensor at the side of an upper part of a pressure receiving diaphragm plate above an inner box and, restricting/releasing the rotation of a driving shaft. CONSTITUTION:An impeller 4 rotated by a fluid is provided in an inner box 8, having a first magnet 15 at an upper end of an axial part 14a thereof. A driving shaft 23 provided via a pressure receiving diaphragm plate 16 fitted into an opening at the upper face of the inner box 8 drives a flow rate integrating/displaying part 27. A second magnet 24 is placed confronting to the magnet 15 without contacting the latter at the lower end of the driving shaft 23. The rotation of the impeller is transmitted by the second magnet 24. The flow rate of a fluid flowing in or out of the inner box 8 is detected at an outer box 1 via these components. A stopper 33 serving also as a temperature sensor and having an engaging arm 35 engaged with or disengaged from a gear part 31 of the driving shaft 23 is provided on the diaphragm plate 16. Accordingly, the rotation of the driving shaft 23 is restricted or released depending on the temperature of the fluid, so that only the amount of a fluid of a desired temperature can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid meter that measures and displays the flow rate of a thermal fluid such as hot water or a hot spring flowing through a water pipe.

[Prior Art] Conventionally, the flow rate of hot water, hot springs, etc. flowing through water pipes has been measured using a liquid meter as shown in FIG. In Figure 3, (1) is an outer box having an inlet (2) and an outlet (3) on both sides;
) is provided with a partition wall (6) having a vertical opening (5). (7)
is a strainer installed inside the entrance (2) of the outer box (1), and (8) is the inlet (2) and outlet (3) of the outer box (1).
This inner box (8) is a bottomed cylindrical inner box with an open top surface and has an inflow hole (9) and an outflow hole (10) corresponding to the partition wall (6) of the outer box (1). The inner space (4) of the outer box (1) is fitted into the opening (5) of the outer box (1), and the inner space (4) of the outer box (1) is
It is divided into an inlet side space (11) which communicates with the inlet side space (11) and an outlet side space (12) which communicates with the outflow hole (1o). (13) is a support shaft held upright at the center of the bottom wall of the inner box (8);
(14) is an impeller rotatably mounted on the spindle (13), and this impeller (14) has blades (14b) radially arranged at equal circumferential locations on the circumferential surface of the shaft (14a). It is provided for.

(15) is a cylindrical first magnet for coupling embedded in the upper end surface of the shaft portion (14a) of the impeller (14);
(16) is a pressure-receiving diaphragm fitted into the upper opening end of the inner box (8), and this pressure-receiving diaphragm (16) has, for example, a cylindrical shape with a bottom as shown in the drawing, and has a bottom wall. The central portion of the portion (17) is recessed upward to form a recess (18) on the lower surface, and the shaft portion (14a) of the impeller (14) is inserted into the recess (18).
Position the top end of the In addition, the pressure receiving partition plate (16
) A plate-shaped regulator (19) is attached to the lower surface of the bottom wall (17) of the impeller (14) so that its position can be adjusted. (20)
is fitted and accommodated inside the pressure-receiving partition plate (16) and the bottom wall portion (21
) is in contact with the upper surface of the protruding part (22) of the pressure-receiving diaphragm (16), and the sealing shield case (23) is the impeller through the bottom wall (17) of the pressure-receiving diaphragm (16). A drive shaft is coaxially and rotatably supported with the shaft (14a) of the wheel (14), and an impeller is attached to the lower end surface of the drive shaft (23) via a pressure-receiving diaphragm (16). (14) A cylindrical second magnet for coupling that faces the first magnet (15) at the upper end of the shaft portion (14a) in a non-contact state) (24)
) is embedded, and the rotational force of the impeller (14) is transmitted to the drive shaft (23) by the magnetic force acting between the first magnet (15) and the second magnet (24). The shield case (20) above the inner box (8) is equipped with a dry-sealed flow rate integration display section (27) consisting of an integration gear (25) or a number wheel (26). , this flow rate integration display section (27) is driven by the rotation of the drive shaft (23). (28) is an upper box fitted to the upper open end of the outer box (1), and (29) is a lid body attached to the upper box (28) so as to be openable and closable. Predetermined structural members of the liquid meter are made of materials that can withstand temperatures of about 100°C.

Then, from the entrance (2) of the outer box (1) to the entrance side space (11
) The hot water that has flowed into the inner box (8) flows into the inner box (8) through the inflow hole (9) of the inner box (8), rotates the impeller (14), rises, and flows out through the outflow hole (10). Exit of box (1) (
3). The rotational force of the impeller (14) is generated in a non-contact state between the shaft portion (14a) of the impeller (14) and the drive shaft (23), which face each other via the bottom wall portion (17) of the pressure-receiving partition plate (16). The first and second magnets (15) facing each other
(24) from the impeller (14) due to the magnetic force of the drive shaft (24).
3), and the rotation of the drive shaft (23) drives the flow rate integration display section (27) to display the flow rate of hot water flowing inside the inner box (8).

[Problem to be solved by the invention] The hot water flowing through the water pipe and inside the inner box (8) of the liquid meter is
When the water supply is stopped, it accumulates in the water pipes and cools down over time. For this reason, according to conventional flow meters, when water supply is resumed, not only the flow rate of hot water but also the flow rate of cooled accumulated water is measured, and the actual flow rate of hot water and the displayed flow rate of hot water displayed on the flow meter are measured. There was a problem that there was a difference.

The present invention was proposed in view of the above problems, and an object of the present invention is to provide a liquid meter that can accurately measure only the flow rate of the thermal fluid among the fluids flowing through the inner box.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an outer box having a fluid inlet and an outlet, and an inlet and an outlet corresponding to the inlet and outlet of the outer box, and an inner box having an opening on the upper surface in which an impeller having a shaft portion with a first magnet provided at the upper end is rotatably disposed therein; and a pressure receiving gap fitted into the upper surface opening of the inner box. A second magnet is rotatably supported above the shaft of the impeller through the plate and the pressure-receiving diaphragm, coaxially with the shaft, and rotatably supported at the lower end thereof, and facing the first magnet in a non-contact state. A drive shaft provided with a magnet, and a flow rate integration display section disposed above the inner box via a pressure receiving diaphragm and driven by the rotation of the drive shaft, In a liquid meter that transmits the rotational force of an impeller to a drive shaft by the magnetic force of first and second magnets facing each other in a non-contact state, the temperature of the fluid flowing inside the inner box is displayed on the upper side of the pressure-receiving diaphragm. The drive shaft is equipped with a temperature sensor that senses the temperature, and a stopper means that locks and releases the drive shaft in conjunction with the temperature sensor.

[Operation] For example, when cooled retained water is flowing inside the inner box, the drive shaft is restrained by the stopper means and stops rotating. When a heated fluid at a predetermined temperature flows inside the inner box,
The stopper means is operated in conjunction with the temperature sensor, and as a result, the drive shaft is released from the restraint by the stopper means and rotates.

[Example] Hereinafter, an example of the liquid meter according to the present invention will be described with reference to FIGS. 1 and 2. Components that are the same as those shown in FIG. 3 are designated by the same reference numerals, and their explanation will be omitted.

In Figures 1 and 2, (31) is the drive shaft (
23) Teeth formed on the outer peripheral surface of the lower end flange (32),
(33) uses this tooth part (31) to connect the drive shaft (23).
This is a stopper means for stopping the rotation of.

The stopper means (33) also serves as a temperature sensor, and has a columnar base end (34) and a columnar base end (34).
A U-shaped locking arm (
35) are integrally molded with shape memory resin, and the symmetrical arm piece (36) that constitutes the locking arm (35)
) A locking pawl (3g) (38) is formed on the inner surface of the tip (37) (37) of (36) to removably fit into and lock with the tooth (31) of the drive shaft (23). It is.

The stopper means (33) has a proximal end (34) screwed and fixed to a predetermined portion of the bottom wall (21) of the sealing shield case (20) with a screw (39).
) The tips (37) ' (37) of the arm pieces (36) (36) are placed in symmetrical positions on both sides of the (31
), and when hot water at a predetermined temperature flows inside the inner box (8), the water temperature is sensed and the arm piece (
36) (36) is configured to be expanded and held in a pre-memorized shape, that is, the shape shown by the dashed line in FIG. 2, and this arm piece (36) (36)
, the locking claws (38) (38) of the arm pieces (36) (36) engage the teeth (3) of the drive shaft (23).
1) Leave more. Incidentally, the operating temperature of the stopper means (33), which is a temperature sensor, may be adjustable using an adjustment screw or the like.

The hot water flowing inside the inner box (8) of the liquid meter through the water distribution pipe stays in the water distribution pipe when the water supply is stopped and cools down over time. Thereafter, when the water supply is restarted, first, the accumulated water that has accumulated in the water pipe and has been cooled flows inside the inner box (8), and the impeller (14) rotates. At this time, the accumulated water has cooled, and the arm pieces (36) (36) of the stopper means (33) are held in the closed state, and the locking claws (3
8) (3B) is removably fitted into and locked into the teeth (31) of the drive shaft (23) from both sides. Therefore, the drive shaft (
23) is the first coupling for the non-contact facing coupling.
The rotation of the impeller (14) is not transmitted to the drive shaft (23), and the flow rate of the accumulated water is not measured. .

When hot water at a predetermined temperature flows inside the inner box (8) after the above-mentioned accumulated water flows, the bottom wall portion (17) of the pressure-receiving diaphragm (16) and its surrounding temperature rise due to the heat of this hot water, and When the temperature is reached, the stopper means (3
3) is activated. In other words, hot water at a predetermined temperature is poured into the inner box (8
), the stopper means (33), which is a temperature sensor, senses the temperature of the water, and the stopper means (33)
The arm pieces (36) (36) are expanded and held in a pre-memorized shape as shown by the second dashed line,
By holding this arm piece (36) (36) open,
Arm piece (36) (36) locking claw (38) (
38) is disengaged from the tooth portion (31) of the drive shaft (23), and the stopped state of the drive shaft (23) is released. When the stopped state of the drive shaft (23) is released in this way, the impeller (14)
) is 1, and the shaft portion (1
The magnetic force of the first and second magnets (15) (24) for coupling between the impeller (14) and the drive shaft (23) is transmitted from the impeller (14) to the drive shaft (23). By the rotation of , the flow rate of hot water flowing inside the inner box (8) is displayed via the flow rate integration display section (27).

In the above embodiment, a shape memory resin is used for the stopper means, but a shape memory alloy or a bimetal may be used instead of the shape memory resin.

Further, in the above embodiment, the temperature sensor and the stopper means are integrally molded, but the present invention is not limited to this. (The temperature sensor and the stopper means may be formed separately, and in this case, the temperature sensor The stopper means is operated in conjunction with the stopper means.

Further, in the above embodiment, the case where the flow rate of hot water is measured is explained, but the present invention is not limited to this, but can be widely applied to the case where the flow rate of hot springs and other thermal fluids is measured. .

[Effects of the Invention] According to the present invention, it is possible to accurately measure only the flow rate of the thermal fluid among the fluids flowing inside the inner box. Therefore, for example, if used to measure hot water flowing inside the inner box through a water pipe, the stagnant water that has accumulated in the water pipe when the water supply is stopped and cooled over time will be removed when the water supply is resumed. It is possible to accurately measure only the flow rate of hot water without being metered, and the actual amount of hot water fed matches the indicated amount of hot water fed on the display of the liquid meter.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the liquid meter according to the present invention, and FIG. 2 is a first A-A diagram showing the arrangement of the stopper means.
It is a cross-sectional view with line portions omitted. FIG. 3 is a partial sectional view showing a conventional liquid meter. (1)...outer box, (2)...entrance, (3
)...Exit, (8)...Inner box, (9)...
...Inflow port, (10)...Outflow port, (14)
... Impeller, (14a) ... Shaft, (15
)...First magnet, (16)...Pressure receiving partition plate, (23)...Drive shaft, (24)...Second magnet, (27)...Flow rate integration display section, (33) Stopper means (temperature sensor). Patent Applicant Osaka Kiko Co., Ltd. 2 Taitoyo Kiko Co., Ltd. Agent Gangwon Province I Figure 1 Figure 2

Claims (1)

[Claims] (1) An outer box having a fluid inlet and an outlet, an inlet and an outlet corresponding to the inlet and outlet of the outer box, and an inner shaft portion having a first magnet at its upper end. an inner box having an opening on the top surface in which an impeller is rotatably arranged; a pressure-receiving diaphragm fitted into the top opening of the inner box; , a drive shaft that is coaxially and rotatably supported with the shaft portion and has a second magnet at its lower end that faces the first magnet in a non-contact state, and an inner box via a pressure-receiving partition plate. a flow rate integration display section disposed above and driven by the rotation of the drive shaft; In a fluid meter that transmits the rotational force of a car to the drive shaft, there is a temperature sensor on the upper side of the pressure-receiving diaphragm that detects the temperature of the fluid flowing inside the inner box, and a temperature sensor that detects the temperature of the fluid flowing inside the inner box, and a temperature sensor that detects the temperature of the fluid flowing inside the inner box. A liquid meter characterized in that it is provided with a stopper means for restraining and releasing.