JPS62228116A - Piston type flowmeter - Google Patents

Abstract

PURPOSE:To easily and accurately assemble a piston in a jig main body, by providing the step part, which is engaged with a piston mounting jig, to the end part of the cylinder of a flowmeter. CONSTITUTION:At first, seals 11, 12 are respectively fitted to the peripheral edges of inside and outside discs 13, 14 constituting a piston 10 and the inside disc 13 is inserted in a jig 20 from the side of the step part 21 thereof and a spacer disc 25 is inserted in the jig 20 from the other end of said jig 20 and, further, the outside disc 14 is inserted in the jig 20 from the other end of said jig 20. By this mechanism, the seals 11, 12 are respectively slid with the inner peripheral surface of the jig 20 in a state curved toward the side of the step part 21 and other end side of the jig 20 and the discs 13, 14 are superposed and integrated in this state by a screw 15. Next, the jig positioning step part 21 is engaged with the guide inside a step part 7a provided to the inner peripheral surface of the end part of a cylinder 7 and the end surface thereof is contacted with the end surface of the inside step part 7a and the piston 10 assembled in the jig 20 is pushed in the cylinder 7 and the assembled piston 10 is fixed to the bracket 9a at the end part of a piston lever by a screw 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to the structure of a cylinder end of a piston type flowmeter.

(Prior Art) A two-piston flowmeter as disclosed in, for example, US Pat. to open and close port 4, and inlet port 5
The liquid such as gasoline flowing from the piston 10 is guided into the cylinder 7 from the front and back surfaces of the piston 10, and the piston 10 is slid back and forth by the pressure, and the liquid that has flowed in is discharged from the outlet 6 with each stroke. It is configured to weigh.

In this way, the two-piston type flowmeter has a structure in which hydraulic pressure is applied alternately from the front and back of the piston, so the piston 1o used for this is provided with two inner and outer seals 11 and 12 on the circumferential surface, so that it can be used in either direction. Even when sliding under hydraulic pressure, liquid is prevented from leaking from between the cylinder 7 and the cylinder 7.

Therefore, when installing this type of piston 1o in the cylinder 7, it is necessary to attach the inner disk 13 of the two disks 13 and 14 that make up the piston 10 to the flow meter main body.
The outer disc 14 is inserted from the inside of the cylinder cover 8 and the seal 12 provided on the periphery thereof is curved inward, The plates 13 and 14 on both sides are attached to the piston rod 9.

For this reason, this type of flowmeter not only has the problem that mounting the piston 10 is extremely troublesome and has poor workability, but also because the inner disk 13 must be inserted from the narrow inside. It is not possible to confirm whether the seal 11 is in proper sliding contact with the inner wall surface of the cylinder 7, and depending on how it is assembled, liquid leakage may occur, which may impair the performance of the flowmeter.

(Objective) The present invention was made in view of the above circumstances, and its object is to provide a piston-type flowmeter with a simple structure that allows a piston to be easily and reliably attached to the cylinder of the flowmeter. It is in.

(Means for Achieving the Object) That is, in order to achieve the object, the present invention provides a piston-type flowmeter in which a stepped portion that fits into a jig for piston assembly is provided at the end of the cylinder.

(Example) The details of the present invention will be described below based on illustrated examples.

FIG. 1 shows an embodiment of the present invention, in which reference numeral 20 is a short cylindrical assembly formed to have an inner diameter that is the same as or slightly smaller than the inner diameter of the cylinder 7. is a jig, and a positioning step 2 for fitting into the end of the cylinder 7 is cut on the outer periphery of one end thereof.

The positioning step 21 is formed to have an outer diameter large enough to fit snugly into the guiding inner step 7a cut on the inner circumferential surface of the end of the cylinder 7, and has an axial length. The length is such that, when fitted to the end of the cylinder 7, the end surface 22 thereof comes into contact with the end surface of the guide inner stepped portion 7a of the cylinder 7.

Next, the procedure for assembling the piston 10 using this jig 20 will be explained. First, seals 11.12 are attached to the peripheries of each of the inner and outer disks 13.14 that make up the piston 10, and then Inner disc] 3 to jig 2
0 into the jig 20 from the stepped portion 21 side, insert the spacer disk 25 into the jig 20 from the other end, and then insert the outer disk 1 into the jig 20 from the other end.
4 into the jig 20 from the other end of the jig 2o. As a result, each seal 1 provided on the inner disk 13 and the outer disk 14
], 12 are curved toward the stepped portion 21 side and the other end of the jig 20, respectively, and come into sliding contact with the inner circumferential surface of the jig 2°. the screw 1
Polymerization is carried out by step 5 (Fig. 1).

Next, the positioning step 2 of the jig 20 is fitted into the guide inner step 7a provided on the inner peripheral surface of the end of the cylinder 7, and the end surface 22 is brought into contact with the end surface of the guide inner step 7a. After making contact with each other, the piston 10 assembled in the jig 2o is pushed into the cylinder 7. As a result, the seals 11 and 12 attached to the circumferential surface of the piston 10 move from the inner surface of the jig 20 to the inner surface of the cylinder 7 while keeping them curved outward from each other. piston 10
is fixed to the bracket 9a at the end of the piston rod 9 with screws 16 (Fig. 2).

The present invention has been described above using an example in which the piston is assembled by assembling the piston 10 in the jig 20, and the operation of moving the piston 10% into the cylinder 7 is performed manually. By providing the portion 7a, fitting with the jig 20 is ensured, and assembly can also be performed by a robot.

(Effects) As described above, according to the present invention, since a stepped portion is provided at the end of the cylinder of the flowmeter to fit into the jig for piston mounting, a cylindrical shape having an inner diameter approximately equal to that of the cylinder is provided. Using the main body of the jig, assemble the piston by inserting the two inner and outer disks from both ends into the jig body, and then assemble the piston by placing the jig in contact with the step on the end face of the cylinder of the flowmeter. Since the seal can be moved into the cylinder, the piston can be easily and accurately assembled inside the jig body while visually confirming the seal installation condition. By separating the steps, the assembly of this type of flowmeter can be made much more efficient.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the cylinder and piston assembly of a flowmeter showing an embodiment of the present invention before fitting of the jig, Fig. 2
←→ is a cross-sectional view showing a state in which a jig for assembling a piston is fitted into the cylinder of a flowmeter, and Figures 3 (a) and (b) are a cross-sectional view and a top view showing an example of a piston-type flowmeter. . 1...Flowmeter body 7...Cylinder 7a
...Guiding inner stepped portion 10...Piston 11.
12... Seal 13.14... Disc 20.
・・・Assembly is done using jig 21...Stepped part for determining the position

Claims (1)

[Claims] A piston-type flowmeter with a positioning step at the end of the cylinder that fits into the piston assembly jig.