CN213236488U

CN213236488U - Measuring coupling

Info

Publication number: CN213236488U
Application number: CN202021040907.8U
Authority: CN
Inventors: K·维乔雷克; A·劳什内尔; D·埃尔克; A·乌德霍弗
Original assignee: Parker Hannifin EMEA SARL
Current assignee: Parker Hannifin EMEA SARL
Priority date: 2020-01-22
Filing date: 2020-06-05
Publication date: 2021-05-18
Anticipated expiration: 2030-06-05
Also published as: FR3106387B3; DE202020100315U1; FR3106387A3

Abstract

The utility model relates to a measure the connector, it has: a base body having a screw-in external thread and a joint external thread; a channel extending from a first end to a second end, wherein the channel is configured with a first section facing the first end and a second section facing the second end and a valve seat disposed between the first section and the second section; a spring disposed in a first section of the channel; and a valve cone arranged in the channel, wherein the valve cone has a conical sealing surface and is prestressed by a spring in the first section in the direction of the conical sealing surface toward the valve seat.

Description

Measuring coupling

Technical Field

Background

Such measuring couplings are used for establishing a connection with a pressure system for control, measuring and testing purposes. The measuring coupling is usually connected to the pressure system by screwing into an external thread, so that the medium under pressure is present via the first end in the first section of the channel of the measuring coupling and presses the valve cone into its sealing position. For connecting, for example, a measuring or testing instrument, the connecting line is screwed onto the external thread of the connection by means of a nut, wherein a pin is provided which moves the valve cone against the spring pretension, so that a flow-technical connection is produced between the first section and the second section, and therefore also a connection is produced between the pressure system and the measuring instrument.

Such a measurement coupler is sold, for example, under the model EMA3 of applicant's corporate enterprise. In this measuring coupling, the first section of the channel is formed directly by the base body, wherein the spring and the valve cone are inserted into the base body from the end configured with the external thread of the joint. From this side, an insert is also screwed into the base body, which insert forms the second section of the valve seat and the passage for the valve cone.

It has now been found that there is a risk that the insert will come loose from the basic body when not in use. Due to the high pressure in the pressure system, the insert and the valve cone thus released are accelerated to a high speed.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is therefore to eliminate the disadvantages described in the prior art and to provide, in particular, a measuring coupling with a reduced risk of functional failure.

This task is solved by a measuring coupling according to the invention. Advantageous refinements of the measuring coupling are specified in the description, wherein the individual features of the advantageous refinements can be combined with one another in a technically meaningful manner.

This object is achieved in particular by a measuring coupling having the features mentioned at the beginning, wherein the channel is formed by a base body, and a sealing ring is arranged between a sealing surface of the valve cone and the spring, and a third section having a diameter smaller than the diameter of the first section and larger than the diameter of the second section is formed between the first section and the valve seat.

It is therefore provided that both the first, second and third sections and the valve seat are formed by the base body. Thus, all of the force generated by the fluid under pressure is directly received by the substrate. For this purpose, it is provided in particular that the base body has a bore which forms the first section of the passage and which extends from the end with the screw-in external thread into the base body and is used for accommodating the valve cone and the spring. The bore also forms a valve seat against which the valve cone is tensioned by a spring.

The invention therefore provides, in its basic concept, that the valve cone is pressed from the side facing the pressure system (on the side of the screw-in external screw) against the (conical) valve seat formed by the base body itself, so that it is already prevented, on the basis of the geometry of the base body and the valve cone, that the valve cone, in the state of connection to the pressure system, does not emerge from the measuring connection on the connection side even in the event of improper operation. Thus, the valve cone cannot leave the base body on the connection side, since the diameter of the valve seat formed by the base body is smaller than the diameter of the valve cone.

A third section is formed between the first section and the valve seat, the diameter of the third section being smaller than the diameter of the first section and larger than the diameter of the second section. The base body thus has, starting from the end with the external screw thread, a stepped bore which forms the valve seat, the third section which engages the valve seat and the first section. Such a substrate can be produced very simply.

In order to improve the sealing properties of the measuring coupling, it can be provided that a sealing ring is arranged in the axial direction between the sealing surface of the valve cone and the spring. Such a sealing ring is dimensioned in particular such that it bears in the radial direction against the wall of the channel at least in the blocking position of the measuring coupling. In the shut-off position, the first section of the channel is therefore fluidically separated from the second section not only by the, in particular, metallic sealing seat between the valve seat and the valve cone, but also, in addition, by an additional sealing ring, which is preferably arranged directly adjacent to the sealing surface of the valve cone.

In particular, it is provided here that the sealing ring is arranged in the third section in the closed state (blocking state) of the measuring coupling. In the blocking position, the sealing ring thus rests with its radially outwardly facing circumferential surface against the inside of the third portion.

Preferably, the third section is dimensioned here over its length such that the sealing ring passes through or moves with the valve cone into the first section in the open state of the measuring coupling. Since the first section has a larger diameter than the third section, the flow connection from the first section to the second section is released in the open state of the measuring coupling.

In order to hold the valve cone and the spring in the base body in a loss-proof manner and to provide support for the spring, a support element held by the base body is inserted into the first section of the channel. The spring is supported on the support member. The support element can be formed, for example, by a (telescopic) bushing which is pressed into the channel formed by the base body (i.e., in particular into the first section of the channel) from the end with the screw-in external thread. Such a support element, which is preferably fixed in the channel in a force-fitting manner, only has to receive the spring force.

Furthermore, it may be provided that the valve cone has a guide projection which extends from the sealing surface into the second section of the channel and which guides the valve cone in the second section during a relative movement of the valve cone with respect to the base body. The guide projection, which is formed in particular integrally with the valve cone, therefore has a diameter which corresponds approximately to the diameter of the second section of the channel, in particular in sections. Thus, when the valve cone is manipulated by connection of the measuring instrument, it is prevented from tilting too much in the channel during linear movement.

Drawings

The invention and the technical field are explained below by way of example with the aid of the figures.

Figure 1 shows a cross-sectional view of a measuring coupling of the present invention.

Detailed Description

The measuring coupling comprises a base body 1, at a first end (lower part in the figure) of which a screw-in external thread 2 is formed for connection to a pressure system and at a second end (upper part in the figure) of which a joint external thread 3 is formed for connection to a measuring instrument.

A channel 4 extending through the entire base body 1 is formed in the base body 1. The channel 4 has a first section 4.1, a third section 4.3 adjoining the first section and a second section 4.2. The base body forms a conical valve seat 5 between the third section 4.3 and the second section 4.2.

The diameters of the different sections of the passage 4 are dimensioned such that the valve cone 7 can be inserted into the passage 4 from the end screwed into the external thread 2. The valve cone 7 in this case rests with its conical sealing surface against the valve seat 5, forming a metallic sealing seat. The valve cone 7 can therefore not move further through the channel 4. The valve cone 7 also has a guide projection 8 which is arranged in the second section 4.2 of the channel 4 in the assembled state. The guide projection 8 has a head with a diameter which corresponds approximately to the diameter of the second section 4.2, so that the valve cone 7 is guided by the guide projection 8 during the relative movement with respect to the base body 1, however a flow-technical connection along the guide projection 8 is provided.

Furthermore, a sealing ring is arranged below the sealing surface of the valve cone 7, which sealing ring, in the shut-off position shown in fig. 1, is arranged in the third section 4.3 of the channel 4 and seals the channel 4 in the radial direction.

The valve cone 7 is biased against the valve seat 5 by means of a spring 6 arranged in the first section 4.1.

The spring 6 is supported on a bushing 10, which is pressed in a force-fitting manner in the channel 4 after the valve cone 5 and the spring 6 have been installed.

Fig. 1 shows the measuring coupling in a closed position, in which the sealing surface of the valve cone 7 is pressed against the valve seat 5, thus forming a metal sealing seat. Furthermore, sealing is performed by a sealing ring 9. Since the valve seat 5 is formed integrally with the base body 1, the valve cone 7 does not emerge from the channel 4 in the direction of the joint-side end even if it is not operated properly.

When the measuring instrument is connected to the measuring coupling, the valve cone 7 is moved by the pin-shaped projection of the joint against the spring force, so that a fluidic connection is established between the first section 4.1 and the second section 4.2 of the channel 4.

List of reference numerals

1 base body

2 screw-in external thread

3 joint external screw thread

4 channel

4.1 first section

4.2 second section

4.3 third section

5 valve seat

6 spring

7 valve cone

8 guide projection

9 sealing ring

10 liner

Claims

1. A gauging coupling, having:

-a base body (1) having a screw-in external thread (2) and a joint external thread (3);

-a channel (4) extending from a first end to a second end, wherein the channel (4) is configured with a first section (4.1) facing the first end and a second section (4.2) facing the second end and a valve seat (5) arranged between the first section (4.1) and the second section (4.2);

-a spring (6) arranged in a first section (4.1) of the channel (4); and

a valve cone (7) arranged in the channel (4), wherein the valve cone (7) has a conical sealing surface and is prestressed by a spring (6) in the first section (4.1) in the direction of the conical sealing surface toward the valve seat (5),

it is characterized in that the preparation method is characterized in that,

the channel (4) is formed by the base body (1), and a sealing ring (9) is arranged between a sealing surface of the valve cone (7) and the spring (6), wherein a third section (4.3) having a diameter that is smaller than the diameter of the first section (4.1) and larger than the diameter of the second section (4.2) is formed between the first section (4.1) and the valve seat (5).

2. Measuring coupling according to claim 1, characterized in that the sealing ring (9) is arranged in the third section (4.3) in the closed state.

3. Measuring coupling according to claim 1 or 2, characterized in that the third section (4.3) has a length such that the sealing ring (9) is moved in the open state into the first section (4.1) by the valve cone (7).

4. Measuring coupling according to claim 1 or 2, characterized in that the valve cone (7) has a guide projection (8) extending from the sealing surface into the second section (4.2) of the channel (4), which guide projection guides the valve cone (7) in the second section (4.2) during relative movement with respect to the base body (1).

5. Measuring coupling according to claim 1 or 2, characterized in that the spring (6) is supported on the side opposite the valve cone (7) on a bushing (10) pressed into the channel (4) with a force closure.