JP4112657B2 - Piston prober for liquid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a volume reference device used when inspecting an instrumental difference of an integrated volume meter such as a water meter, and relates to improvement of a so-called piston puller for liquid.
[0002]
[Prior art]
A so-called piston type puller is disclosed in Japanese Patent Laid-Open No. 7-1113677 as a volume reference device used in an automatic inspection device for a water meter.
[0003]
This piston puller for liquid moves the piston in the cylinder with the axis arranged horizontally, and moves the piston in the axial direction by converting the rotation of the servo motor into a linear motion by a converter.
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional technology, stick slip or the like may occur due to rattling of the piston at a minute flow rate or the like, that is, stop or move, and the accuracy of the instrumental error inspection is lowered, and low sliding resistance and durability are pointed out. There is a problem that it is difficult to satisfy the effective period as a volume reference device.
[0005]
There is also a problem that it is difficult to remove air.
Furthermore, there has been a problem that dust, rust, etc. in the cylinder cannot be easily removed.
[0006]
Accordingly, an object of the present invention is to provide a piston puller for liquid that can solve such problems.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the first invention according to claim 1 provides:
A horizontal double-acting piston type volume reference device used when checking the instrumental difference of a water meter, which is an integrating volume meter,
A cylindrical cylinder (1) having an axis disposed horizontally, and a piston (11) slidably fitted in the cylinder (1);
A substantially cylindrical tube portion (12) in which the piston (11) is fitted to the inner periphery of the cylinder (1), and end plates (13) and (14) attached to both ends of the tube portion (12) at intervals. And consist of
A piston rod (16) fixed to the both end plates (13) (14);
A space surrounded by the cylindrical portion (12) and both end plates (13) (14) forms an air chamber (19), and the air chamber (19) is filled with gas,
The piston (11) includes a support ring (15) that fits into a groove formed on the outer periphery of the cylindrical portion of the piston (11),
Two O-rings (20) which fit into the inner peripheral groove of one end plate (13) and are in close contact with the outer periphery of the piston rod (16) to shut off the air in the air chamber (19) and the cylinder (1). ) (20)
Two O-rings (21) that fit into the inner peripheral groove of the other end plate (14) and are in close contact with the outer periphery of the piston rod (16) to shut off the air chamber (19) and the water in the cylinder (1). ) (21)
A first pair of piston seals (23) and (23) which are fitted into the outer peripheral groove of the cylindrical portion (12) of the piston (11) and seal between the piston (11) and the cylinder (1); Two pairs of piston seals (24) (24);
A first O-ring (22) provided between one end of the cylindrical portion (12) and one end plate (13) and blocking water in the air chamber (19) and the cylinder (1);
A second O-ring (22) provided between the other end of the tube portion (12) and the other end plate (14) and blocking water in the air chamber (19) and the cylinder (1). Provided
This is a piston puller for liquid.
[0009]
The invention of claim 2 is the liquid piston PROVER of claim 1 and is characterized in that a air vent at the top a and the ends of the cylinder.
[0010]
The invention of claim 3, in claim 1 or 2 of the liquid piston PROVER,
A dust storage portion is formed at an inner bottom portion and an end portion of the cylinder, and a dust cleaning port is provided in the dust storage portion.
[0011]
[Action]
The substantial weight of the piston is reduced by the buoyancy of the air chamber, and the piston moves lightly. For this reason, stick slip does not occur even at a minute flow rate, and the reliability of the piston puller is improved.
[0012]
In addition, considering the substantial weight reduction of the piston by the air chamber, the horizontal length of the cylindrical portion, that is, the thickness of the piston can be increased, so that the shakiness of the piston can be reduced, and the stick slip of the surface can be reduced. Occurrence decreases.
[0013]
Air venting easily removes air from the cylinder as necessary to reduce measurement errors.
The dust that has entered the cylinder and the dust generated in the cylinder are collected in a dust reservoir outside the sliding portion of the piston, and the dust is discharged from the dust cleaning port as needed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described based on examples of the drawings.
The cylindrical cylinder 1 is disposed horizontally, and lid-like heads 2 and 3 are fixed to the left and right ends thereof. The cylinder 1 is supported by the heads 2 and 3, the support blocks 4 and 5, the base plate 6 and the anti-seismic mounts 7 and 8 so that the axis is horizontal.
[0015]
Bearing heads 9 and 10 for slidably bearing piston rods, which will be described later, are fixed to the heads 2 and 3.
The piston 11 includes a substantially cylindrical tube portion 12 and end plates 13 and 14 attached to the left and right ends thereof. The piston 11 is fitted in the cylinder 1 so as to be slidable left and right.
[0016]
A support ring 15 is fitted in a groove formed on the outer periphery of the cylindrical portion 12.
The piston rod 16 is fixed to the end plates 13 and 14 by piston locks 17 and 18. The piston rod 16 is supported by the bearing heads 9 and 10 and can move in the horizontal direction in the figure.
[0017]
A space surrounded by the cylindrical portion 12 and the end plates 13 and 14 forms an air chamber 19, and the air chamber 19 is filled with gas.
Reference numerals 20 and 21 denote sealing O-rings fitted in the inner peripheral grooves of the end plates 13 and 14, which are in close contact with the outer periphery of the piston rod 16 to block the air chamber 19 from the liquid (water) in the cylinder 1. Reference numeral 22 denotes an O-ring that performs the same function.
[0018]
Reference numerals 23 and 24 denote piston seals which are fitted into the outer peripheral groove of the piston 11 to seal between the piston 11 and the cylinder 1. O-rings 25 and 26 fitted into the grooves of the heads 2 and 3 prevent liquid leakage from between the cylinder 1 and the heads 2 and 3.
[0019]
At both ends of the inner bottom portion of the cylinder 1, dust storage portions 1a and 1b having a larger diameter than the other portions are formed. Fine matter such as dust and rust collected in the dust storage portions 1a and 1b is collected in the portions 1a and 1b. The dust cleaning ports 27 and 28 provided on the front are opened and removed at an appropriate time. In the figure, these ports 27 and 28 are provided with plugs.
[0020]
Air vents 29 and 30 are provided at the upper and end portions of the cylinder 1 for both calibration and use.
31 and 32 are the 1st and 2nd bearing seals provided in the bearing head.
[0021]
The piston 11 moves to the right in FIG. 1 by putting liquid into the cylinder 1 from the hole 33 in the head 2, and moves to the left in FIG. 1 by putting liquid in the cylinder 1 from the hole 34 in the head 3. To do.
[0022]
The piston rod 16 passes through the bearing head 9 and extends leftward in FIG. 1, and a tie plate 35 is fixed to the left end thereof. The tie plate 35 is guided by guide bars 36 and 37 each having one end fixed to the head 2, and moves to the left and right in FIG. 1 together with the piston rod 16.
[0023]
The moving distance of the piston 11, that is, the actual flow rate of the liquid, is read by a sensor 40 attached to the upper end of the tie plate 35 on the scale of the digital scale body 39 with one end fixed to the frame 38 fixed to the left end of FIG. Detected as a digital quantity.
[0024]
As the digital scale, a linear scale, a magnetic magnescale, or the like can be used.
In order to inspect the instrumental difference of the integrated volume meter such as a water meter using the above-mentioned piston puller for liquid, supply water with pump pumping and constant pressure tank, and drive and supply water with the illustrated horizontal double-acting piston system. At the same time water supply and metering (drainage).
[0025]
【The invention's effect】
Since the piston puller for liquid of the present invention is configured as described above, the substantial weight of the piston is reduced, and stick slip does not occur at the time of a minute flow rate, thus improving measurement accuracy and reliability. improves.
[0026]
Occurrence of stick slip is reduced in terms of the rattling of the piston can be reduced to of al.
Moreover, in the invention of claim 2 , the air in the cylinder can be easily removed.
[0027]
In the invention of claim 3 , further, fine matters such as dust are collected outside the sliding portion of the piston and can be easily removed as necessary, so that the life is extended from that surface and the reliability is improved. To do.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a view showing a part of the left side surface of the embodiment of the present invention.
FIG. 4 is a diagram showing a part of the right side surface of the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder 1a, 1b Garbage storage part 2, 3 Head 11 Piston 12 Tube part 13, 14 End plate 16 Piston rod 19 Air chamber 27, 28 Garbage cleaning ports 29, 30 Air vent

Claims (3)

A horizontal double-acting piston type volume reference device used when checking the instrumental difference of a water meter, which is an integrating volume meter,
A cylindrical cylinder (1) having an axis disposed horizontally, and a piston (11) slidably fitted in the cylinder (1);
A substantially cylindrical tube portion (12) in which the piston (11) is fitted to the inner periphery of the cylinder (1), and end plates (13) and (14) attached to both ends of the tube portion (12) at intervals. And consist of
A piston rod (16) fixed to the both end plates (13) (14);
A space surrounded by the cylindrical portion (12) and both end plates (13) (14) forms an air chamber (19), and the air chamber (19) is filled with gas,
The piston (11) includes a support ring (15) that fits into a groove formed on the outer periphery of the cylindrical portion of the piston (11),
Two O-rings (20) which fit into the inner peripheral groove of one end plate (13) and are in close contact with the outer periphery of the piston rod (16) to shut off the air in the air chamber (19) and the cylinder (1). ) (20)
Two O-rings (21) that fit into the inner peripheral groove of the other end plate (14) and are in close contact with the outer periphery of the piston rod (16) to shut off the air chamber (19) and the water in the cylinder (1). ) (21)
A first pair of piston seals (23) and (23) which are fitted into the outer peripheral groove of the cylindrical portion (12) of the piston (11) and seal between the piston (11) and the cylinder (1); Two pairs of piston seals (24) (24);
A first O-ring (22) provided between one end of the cylindrical portion (12) and one end plate (13) and blocking water in the air chamber (19) and the cylinder (1);
A second O-ring (22) provided between the other end of the tube portion (12) and the other end plate (14) and blocking water in the air chamber (19) and the cylinder (1). Provided
Piston prober for liquid. Claim 1 Symbol placement of the liquid piston PROVER characterized by providing an air vent at the top a and the ends of the cylinder. Forming a garbage reservoir to and end at the inner bottom portion of the cylinder, according to claim 1 or 2 liquid piston PROVER according to characterized in that a dusting port to the waste reservoir.

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