CN107061793B - Constant value decompression real-time sampling valve - Google Patents

Abstract

The invention provides a fixed-value decompression real-time sampling valve, which is mainly composed of an upper body, a lower body and an electromagnetic switch valve. The upper body and the lower body are connected by threads, and the upper body is provided with a liquid inlet, a liquid outlet and a control The upper body is equipped with a valve core, spring, and retaining ring. The valve core is assembled in the valve cavity. The valve core is equipped with a spring and pressed against the retaining ring. On-off valve, end cover, piston and push rod are built in the lower body, and the piston and push rod are connected by bolts and placed in the piston chamber; the invention effectively solves the problem of inconvenient on-site operation of real-time sampling of cement slurry and drilling mud in the cementing system , and the structure is simple, the installation is convenient, and the operation is flexible, which greatly reduces the labor intensity of workers.

Description

A real-time sampling valve for fixed-value decompression

technical field

The invention relates to a sampling device, in particular to a constant-value decompression real-time sampling valve.

Background technique

Sampling valve is a valve used to obtain medium samples in pipelines or equipment. In many occasions where chemical analysis of medium samples is often required, special sampling valves are often used. According to the working principle or performance of sampling, sampling valves are mainly divided into three types, including double opening valves, flange clip valves and sampling valves with insulation jackets, but they cannot effectively deal with complex molecular structures, viscosity Large fluids are prone to clogging problems, and are not suitable for high-pressure environments. The safety performance is unstable, and real-time sampling cannot be realized.

Contents of the invention

In order to overcome the problems existing in the existing tools, the object of the present invention is to provide a real-time sampling valve with fixed value decompression that is easy to use and install, safe and reliable. The present invention has a simple structure, can realize real-time sampling and reduce the pressure of the sampling port.

To achieve the above object, the present invention adopts the following technical solutions:

A fixed-value decompression real-time sampling valve, including an upper body, a spring, a valve core, a push rod, a piston, a lower body, and an electromagnetic switch valve;

The rear end of the upper body and the lower body are connected by threads, the upper body is provided with a valve cavity for assembling the valve core, and the front end of the upper body is provided with a liquid inlet A, a liquid outlet B and a control liquid channel D that are connected to the main pipeline of the sampling liquid. The liquid inlet A, the liquid outlet B, and the control liquid channel D are all connected with the valve cavity of the upper body. The valve core, spring and retaining ring are built in the valve cavity. The ring is pressed against the boss, and the two sides of the valve core are respectively provided with a fluid through hole F communicating with the valve cavity. There is an annular throttling channel E between the valve core and the upper body, and the inlet of the throttling channel E is connected to the fluid through hole F The connection and the outlet are provided with a throttling port M;

The lower body is provided with a piston chamber for installing the push rod and the piston. The piston is connected to the valve core through the push rod. The lower body is provided with a sampling port C and a control fluid channel H. The sampling port C is connected to the piston chamber, and the valve core is pressed against the lower body to form a On the valve seat, the piston chamber and the throttle port M in the upper body are connected or cut off through the valve core, and the control liquid channel H communicates the control liquid channel D on the upper body with the rear of the piston chamber. An electromagnetic switch valve that controls the connection or cut-off of the control liquid channel H. The piston is provided with a damping hole G that connects the front and rear parts of the piston chamber. Through the control liquid channel H, it presses to the rear of the piston chamber to push the piston forward, and then pushes the valve core. Make the orifice M communicate with the piston cavity, and take samples through the sampling port C.

Further, the piston and the push rod are connected by bolts, sealed by an O-ring and placed in the piston cavity.

Further, an end cover is screwed from the rear end of the lower body to the end, and a sealing ring is provided between the end cover and the lower body.

Further, the liquid inlet A is connected to the main pipeline of the sampling liquid by a flange, the liquid outlet B is connected to the main pipeline by threads, and the sampling port C is connected to the sampling pipe by threads.

Further, the top end of the valve core is a conical structure, which presses against the valve seat formed by the lower body.

Further, the taper of the cone valve in the electromagnetic switch valve is 10°-60°.

Compared with the prior art, the present invention has the following beneficial technical effects:

The fixed-value decompression real-time sampling valve of the present invention includes an upper body, a spring, a valve core, a push rod, a piston, a lower body, and an electromagnetic switch valve; it adopts a segmented structure, and when sampling, the electromagnetic switch valve is connected and opened to enter the piston cavity A part of the high-pressure liquid flows from the liquid inlet to the control liquid channel in the upper and lower body, and then flows into the rear chamber of the piston, acting on the rear end surface of the piston, and at the same time enters the front chamber of the piston through the damping hole on the piston. A throttling pressure difference is formed on the front and rear ends of the piston, thereby pushing the piston forward, jacking up the valve core, and opening the sampling channel, then the sampling liquid flows to the valve cavity through the through hole on the side wall of the valve core, and flows out through the throttle port. The sampling port, due to the throttling effect, the pressure of the sampling port is greatly reduced, and is generally set to be slightly higher than the atmospheric pressure, so as to realize real-time sampling at a constant value decompression.

When the sampling is finished, close the electromagnetic switch valve, the chamber behind the piston cuts off the high-pressure fluid, and the front and rear chambers of the piston form a pressure balance due to the connection of the damping hole. The return spring resets the valve core and presses against the lower valve seat to close the sampling port. At the same time, push the piston to move backward.

The invention effectively solves the problem of inconvenient on-site operation of real-time sampling of cement slurry, drilling mud, etc. in the cementing system, and has simple structure, convenient installation and flexible operation, can realize real-time sampling, reduce the pressure of the sampling port, and greatly reduce the labor of workers strength.

The upper body and the lower body are threaded, which avoids the problem that the impurities deposited inside cannot be removed during integral molding, and enables the installation and replacement of the valve core, making its assembly and valve core maintenance and replacement very convenient and quick.

The valve core wall is provided with a fluid through hole, which communicates with the valve cavity, so that the liquid can smoothly flow through the valve cavity to the throttling channel.

There is a damping hole on the piston, so that when the piston moves forward, a throttling pressure difference is generated, and when the piston moves backward, the liquid pressure at both ends of the piston is balanced.

There is an annular throttling passage between the valve core and the valve upper body, and the outlet of the throttling passage is a throttling port whose opening can be set, and its size can be changed according to the pressure of the liquid. When the piston moves forward, the liquid flows The throttling port produces a throttling effect, so that the pressure of the sampling port is slightly higher than the atmospheric pressure, realizing the effect of constant value decompression.

Furthermore, the top end of the valve core has a conical structure, which presses against the valve seat of the lower body, which can better block the liquid flowing to the sampling port.

Furthermore, the taper of the cone valve in the electromagnetic switch valve is 10°-60°, so that it can reduce the force of fluid in the lateral direction and move freely up and down.

Further, the push rod and the piston are threadedly connected, and an O-ring is provided between them, so that the connection between the push rod and the piston is convenient, and the liquid is prevented from entering the piston chamber from the gap, so that there is sufficient pressure difference inside and outside the fluid channel, and the sampling The process is facilitated.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention

Among the figure: upper body 1, retaining ring 2, spring 3, spool 4, push rod 5, piston 6, O-ring 7, lower body 8, end cap 9, electromagnetic switch valve 10.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a real-time sampling valve for fixed-value decompression mainly includes an upper body 1, a retaining ring 2, a spring 3, a valve core 4, a push rod 5, a piston 6, an end cover 9, and an electromagnetic switch valve 10.

The upper body 1 and the lower body 8 are screwed together. The upper body is provided with a liquid inlet A, a liquid outlet B and a control liquid channel D. The upper body is equipped with a valve core 4, a spring 3, and a retaining ring 2. The valve core is assembled in the valve cavity. Inside, the spool is equipped with a spring, which presses against the retaining ring, and the two sides of the spool are respectively provided with fluid through holes F, which communicate with the valve cavity; there is an annular throttling passage E between the spool 4 and the valve upper body 1, The outlet of the throttling passage is a throttling port M whose opening degree can be set. The lower body is equipped with a sampling port C and a control fluid channel H, and is equipped with an electromagnetic switch valve 10 and an end cover 9. The lower body is equipped with a piston 6 and a push rod 5. The piston and the push rod are sealed by an O-ring 7 and connected by bolts. , placed in the piston cavity, free to move, one or two damping holes G are set on the piston, the push rod 5 is a rotating body, the bottom is a round surface structure, and the lower body is screwed with an end cover 9 at the end of the axial direction , There is a sealing ring between the end cover and the lower body.

The liquid inlet A is connected to the main pipeline with a flange, the liquid outlet B is connected to the main pipeline with threads, and the sampling port C is connected to the sampling pipe with threads; the upper body 1 and the lower body 8 are both rotary bodies, and they are connected by threads . The top of the valve core 4 is a conical structure, which is pressed against the valve seat of the lower body. The taper of the cone valve in the electromagnetic switch valve 10 is 10° to 60°.

When sampling, turn on the electromagnetic switch valve 10, open the control liquid passage into the piston chamber, and a part of the high-pressure liquid flows from the liquid inlet A to the control liquid passages D and H in the upper body 1 and lower body 8, and then flows into the rear chamber of the piston 6 , acts on the rear end surface of the piston, and at the same time enters the front chamber of the piston through the damping hole G on the piston, forming a throttling pressure difference on the front and rear end surfaces of the piston, thereby pushing the piston forward, lifting the valve core 4, and opening the sampling channel. Then the sampling liquid flows to the valve chamber through the through hole F on the side wall of the valve core, and flows out of the sampling port C through the throttle channel E, and the throttle port M flows out of the sampling port C. Realize constant value decompression real-time sampling.

When the sampling is finished, close the electromagnetic switch valve 10, the chamber behind the piston blocks the high-pressure fluid, and the front and rear chambers of the piston form a pressure balance due to the connection of the damping hole G. The return spring 3 resets the valve core 4 and presses it against the valve seat of the lower body. Close the sampling port, at the same time, push the piston to move backwards, and at the same time, the end cover 9 located at the end of the rear axial direction on the lower body 8 can realize the installation and replacement of the push rod and the piston, making it easy to assemble, repair and replace. Very convenient and fast.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple deduction or replacement can also be made, all of which should be regarded as belonging to the scope of patent protection determined by the submitted claims of the present invention.

Claims (4)

1. A constant value decompression real-time sampling valve is characterized in that: comprise upper body (1), spring (3), spool (4), push rod (5), piston (6), lower body (8), Electromagnetic switch valve (10); The rear end of the upper body (1) is connected to the lower body (8) through threads, the upper body (1) is provided with a valve cavity for assembling the valve core (4), and the front end of the upper body (1) is provided with a main pipe for sampling liquid. The liquid inlet A, liquid outlet B and control liquid channel D, the liquid inlet A is connected with the valve cavity, and the valve core (4), spring (3) and retaining ring (2) are built in the valve cavity, and the valve cavity A spool (4) is provided, and a spring (3) is provided inside the spool (4), and a retaining ring (2) is provided between the spool (4) and the liquid inlet A, and the valve core is provided on both sides of the outside of the valve core. The fluid through hole F connected with the cavity, an annular throttling passage E is also provided between the valve core (4) and the upper body (1), the inlet of the throttling passage E communicates with the fluid through hole F, and the outlet is provided with a throttling port M; The lower body (8) is provided with a piston cavity for installing the push rod (5) and the piston (6), the piston (6) is connected to the valve core (4) through the front push rod (5), and the lower body (8) is provided with a sampling Port C, control liquid channel H, sampling port C communicates with the piston chamber, the valve core (4) is pressed against the valve seat formed by the lower body, and the piston chamber and the throttle port M in the upper body (1) pass through the valve core ( 4) Connect or cut off, the control liquid channel H communicates the control liquid channel D on the upper body (1) with the piston cavity behind the piston (6), and the upper body (1) is also provided with a control liquid channel H The electromagnetic switch valve (10) connected or cut off, the piston (6) is provided with a damping hole G connecting the front and rear parts of the piston chamber, and the piston (6) is moved forward by pressing the control liquid channel H to the rear of the piston chamber. Then push the spool (4) to make the throttle port M communicate with the piston chamber, and take samples through the sampling port C; The rear end of the lower body (8) is screwed to the end with an end cover (9), and a sealing ring is provided between the end cover (9) and the lower body (8); The top of the valve core (4) is a conical structure, which is pressed against the valve seat formed by the lower body. 2. The constant-value decompression real-time sampling valve according to claim 1, characterized in that the piston and the push rod are connected by bolts, sealed by an O-ring (7) and placed in the piston cavity. 3. The constant-value decompression real-time sampling valve according to claim 1, characterized in that: the liquid inlet A is connected with the main pipeline of the sampling liquid with a flange, the liquid outlet B is connected with the main pipeline with threads, and the sampling port C is connected with the main pipeline. Threaded and sample tube connections. 4. The constant-value decompression real-time sampling valve according to claim 1, characterized in that: the taper of the solenoid valve (10) is 10°-60°.

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