Air pressure type automatic flow regulating valve

Abstract

The invention provides an air pressure type automatic flow regulating valve which comprises a main valve body, an auxiliary valve body, an air pressure cylinder, a piston rod, a spring, a regulating head, a check block, a constant-pressure one-way valve and a plurality of bolts and nuts. Wherein the main valve body and the auxiliary valve body are assembled together through bolts and nuts, the left ends and the right ends of the main valve body and the auxiliary valve body are connected with an inlet pipeline and an outlet pipeline, sealing grooves are designed in the main valve body and the auxiliary valve body, and sealing of the valve bodies is achieved by installing sealing strips. The function of adjusting the opening degree of an outlet by receiving inlet flow pressure change so as to stabilize the flow of the outlet is achieved. The overall size is small, air pressure and the spring are used in cooperation to receive fluid pressure changes so as to adjust the opening degree of an outlet, the sensitivity degree of the adjusting valve can be greatly improved, fluid flow can be automatically adjusted, the outlet flow can be stabilized, and meanwhile the adjusting valve can adapt to various flow pressure working conditions by adjusting the air pressure and the spring rigidity.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid transmission, and in particular relates to a pneumatic flow automatic regulating valve. Background Art

[0002] Flow stabilizing valves are indispensable equipment in the oil field production field. During the oil field production process, some pipeline oil transportation requires stable flow, but the existing flow control means are still mainly based on manual adjustment of valve opening. When the flow pressure is unstable, manual repeated adjustment is required. Not only is the labor cost high and the response is slow, but the valve is also worn out and it is easy to cause production risks. At the same time, in the field of hydraulic fracturing technology, when too much fracturing fluid enters the reservoir, part of the liquid needs to be discharged through a relatively stable displacement. A common method is to insert a nozzle of a certain inner diameter into the nozzle sleeve of the ground oil tree or the oil flow line to discharge the liquid. When the internal pressure changes and needs to be regulated, the well needs to be shut down, emptied and the nozzle replaced. This method will greatly affect the normal production of oil and gas wells. At the same time, the nozzle replacement process is relatively complicated and the manpower loss is large. Chinese patent application CN201710310221.2 discloses an automatic regulating valve for fracturing fluid return flow. The overall size of the regulating valve is large, and due to the small fluid inlet of the automatic pressure regulating assembly, the overall flow rate is small, which causes the liquid in the upper pipeline to produce a large pressure build-up and a large pressure difference before and after the assembly, and thus the valve is not sensitive to changes in flow pressure. Chinese patent application CN202010017495.4 discloses a flow stabilizing valve, which uses a fluid medium to push a hollow ball valve to adjust the outlet opening. Since a ball valve sealing structure is provided at the outlet, when the inlet flow pressure is too large, the outlet will be directly sealed, resulting in pressure buildup inside the pipeline, posing a safety hazard. At the same time, ball valves of different qualities are required for different flow pressure changes, and the control valve can only be placed upright and cannot be inverted. After inverted installation, the outlet will be sealed due to the influence of the ball valve's own gravity, resulting in functional failure. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The present invention proposes a pneumatic flow automatic regulating valve to solve the technical problems that in the process of fracturing fluid backflow in oil production and fracturing technology, the outlet opening needs to be manually adjusted based on the flow pressure to stabilize the outlet flow, and the existing automatic regulating devices have poor sensitivity, large size, and are not suitable for on-site use. The pneumatic flow automatic regulating valve can automatically adjust the outlet opening according to the change of the flow pressure inside the pipeline, stabilize the valve body outlet flow, and realize the stable output of oil production and fracturing fluid.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention proposes a pneumatic flow automatic regulating valve, which includes a main valve body, a secondary valve body, a pneumatic cylinder, a piston rod, a spring, a regulating head, a stopper and a constant pressure one-way valve; wherein,

[0007] The main valve body and the auxiliary valve body are butt-assembled by bolts and nuts to form a valve body assembly, and a mounting cavity for accommodating the flow self-regulating valve core is formed inside the butt-assembled valve body assembly;

[0008] The top and bottom of the inner cavity of the main valve body are respectively provided with a plurality of pneumatic cylinder mounting seats for fixedly connecting with the pneumatic cylinder of the flow self-regulating valve core; the front and rear ends of the inner cavities of the main valve body and the auxiliary valve body are respectively provided with a fluid inlet and a fluid outlet connected with the inner cavity;

[0009] The pneumatic cylinder, piston rod, spring, adjusting head, stopper and constant pressure one-way valve constitute a flow self-regulating valve core; a plurality of valve body mounting holes are respectively processed at the upper and lower ends of the cylinder body of the pneumatic cylinder, which are mounted on the pneumatic cylinder mounting seat of the main valve body by bolts; a one-way valve mounting threaded hole is provided on the cylinder body of the pneumatic cylinder, and the constant pressure one-way valve is installed at the one-way valve mounting hole by thread, and the internal air pressure of the pneumatic cylinder is adjusted to adapt to different flow pressure conditions; a piston push rod sealing groove and a spring fixing groove are respectively provided at the piston rod through hole on the front end surface of the cylinder body wall of the pneumatic cylinder from the inside to the outside, and a piston push rod sealing ring is installed in the piston push rod sealing groove to realize the dynamic sealing between the piston rod push rod and the pneumatic cylinder; the piston rod comprises two parts, a piston and a push rod, the piston is arranged inside the cylinder body of the pneumatic cylinder, and the rear end of the push rod is fixedly connected to the piston, The front end of the push rod extends out from the piston rod through hole of the pneumatic cylinder; the front end of the push rod is processed with a threaded connector for installing an adjusting head, and the front end face of the push rod is processed with a fixed threaded hole for installing a stopper; the adjusting head is provided with a spring fixing groove and a mounting threaded hole, and the adjusting head is fixedly connected to the threaded connector of the piston rod through the mounting threaded hole, and a spring is sleeved on the push rod of the piston rod, and the front and rear ends of the spring are respectively arranged in the spring fixing groove of the adjusting head and the spring fixing groove of the pneumatic cylinder to limit the lateral freedom of the spring, and make the front and rear ends of the spring respectively support the pneumatic cylinder and the adjusting head, and the spring is always in a compressed state, and the flow self-regulating function is realized by the air pressure in the pneumatic cylinder and the elastic force of the spring; the stopper is fixedly connected to the fixed threaded hole on the front end face of the push rod and the threaded hole on the front end face of the adjusting head by multiple bolts.

[0010] Furthermore, the main valve body and the auxiliary valve body are butt-assembled by bolts and nuts to form a valve body assembly.

[0011] Furthermore, the contact parts of the main valve body and the auxiliary valve body are respectively provided with a main valve body sealing groove and an auxiliary valve body sealing groove, and sealing strips are installed in the sealing grooves to achieve sealing of the valve body assembly.

[0012] Furthermore, the inner diameters of the fluid inlet and the fluid outlet are both smaller than the inner diameter of the inner cavity.

[0013] Furthermore, a guide plate is provided at the rear of the cylinder body of the pneumatic cylinder to guide the fluid entering the valve body from the fluid inlet to fully impact the piston rod.

[0014] Furthermore, a piston sealing groove is processed on the outer periphery of the piston for installing a piston sealing ring to achieve dynamic sealing of the piston of the piston rod relative to the pneumatic cylinder.

[0015] (III) Beneficial effects

[0016] The present invention proposes a pneumatic flow automatic regulating valve, including a main valve body, a sub-valve body, a pneumatic cylinder, a piston rod, a spring, an adjusting head, a stopper, a constant pressure one-way valve and a plurality of bolts and nuts. The main valve body and the sub-valve body are assembled together by bolts and nuts, and the left and right ends are connected to the inlet and outlet pipelines. At the same time, the main valve body and the sub-valve body are designed with sealing grooves, and the sealing of the valve body is achieved by installing sealing strips. The pneumatic cylinder, the piston rod, the spring, the adjusting head and the stopper constitute a flow self-regulating valve core, which realizes the function of accepting the change of the inlet flow pressure to adjust the outlet opening, thereby stabilizing the outlet flow. The overall size of the present invention is small, and the air pressure and the spring are used to receive the change of the fluid pressure and then adjust the outlet opening, thereby greatly enhancing the sensitivity of the regulating valve, realizing the automatic adjustment of the fluid flow and stabilizing the outlet flow. At the same time, various flow pressure conditions can be adapted by adjusting the air pressure and the spring stiffness. The present invention has a simple structure, strong adaptability, convenient manufacture and certain practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external structure of the pneumatic flow automatic regulating valve of the present invention;

[0018] Figure 2 It is a schematic diagram of the internal structure of the pneumatic flow automatic regulating valve of the present invention;

[0019] Figure 3a This is a schematic diagram of the internal structure of the main valve body. Figure 3b for Figure 3a AA section view;

[0020] Figure 4a The schematic diagram of the internal structure of the auxiliary valve body is shown in Figure 2. Figure 4b for Figure 4a AA section view;

[0021] Figure 5 This is a schematic diagram of the internal structure of the flow self-regulating valve core;

[0022] Figure 6a It is a schematic diagram of the structure of the pneumatic cylinder. Figure 6b for Figure 6a AA section view, Figure 6cis a side view;

[0023] Figure 7a is a schematic diagram of the piston rod structure. Figure 7b for Figure 7a AA section view, Figure 7c is a side view;

[0024] Figure 8a This is a schematic diagram of the adjustment head structure. Figure 8b for Figure 8a AA section view. DETAILED DESCRIPTION

[0025] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0026] This embodiment provides a pneumatic flow automatic regulating valve, the overall structure of which is as follows: Figure 1 and 2 As shown, it mainly includes a main valve body 1, an auxiliary valve body 2, a pneumatic cylinder 3, a piston rod 4, a spring 5, an adjusting head 6, a stopper 7 and a constant pressure check valve 8.

[0027] The main valve body 1 and the auxiliary valve body 2 are butt-jointed and assembled with bolts and nuts to form a valve body assembly, and a mounting cavity for accommodating a flow self-regulating valve core is formed inside the butt-jointed valve body assembly.

[0028] like Figure 3a and 3b As shown in FIGS. 4a and 4b , the contact parts of the main valve body 1 and the auxiliary valve body 2 are respectively provided with a main valve body sealing groove 1 - 4 and an auxiliary valve body sealing groove 2 - 1 , and sealing strips are installed in the sealing grooves to achieve sealing of the valve body assembly.

[0029] The top and bottom of the inner cavity of the main valve body 1 are respectively provided with a plurality of pneumatic cylinder mounting seats 1-2, which are used to be fixedly connected with the pneumatic cylinder 3 of the flow self-regulating valve core. The front and rear ends of the inner cavity are respectively provided with a fluid inlet 1-1 and a fluid outlet 1-3 connected with the inner cavity, and the inner diameters of the fluid inlet 1-1 and the fluid outlet 1-3 are both smaller than the inner diameter of the inner cavity. The auxiliary valve body 2 is also provided with an inner cavity and a fluid inlet and a fluid outlet.

[0030] The pneumatic cylinder 3, the piston rod 4, the spring 5, the regulating head 6, the stopper 7 and the constant pressure check valve 8 constitute the flow self-regulating valve core. Figure 5 shown.

[0031] like Figure 6a-6cAs shown, the upper and lower ends of the cylinder body of the pneumatic cylinder 3 are respectively processed with a plurality of valve body mounting holes, which are installed on the pneumatic cylinder mounting seat 1-2 of the main valve body 1 by bolts. A one-way valve mounting threaded hole 3-1 is provided on the cylinder body of the pneumatic cylinder 3, and the constant pressure one-way valve 8 is installed at the one-way valve mounting hole 3-1 by thread. The internal air pressure of the pneumatic cylinder 3 is adjusted to adapt to different flow pressure conditions. A guide plate 3-2 is provided at the rear of the cylinder body of the pneumatic cylinder 3, which is used to guide the fluid entering the valve body from the fluid inlet to fully impact the piston rod 4, thereby improving the flow pressure sensitivity of the flow self-regulating valve core. At the piston rod through hole on the front end surface of the inner wall of the cylinder body of the pneumatic cylinder 3, a piston push rod sealing groove 3-4 and a spring fixing groove 3-3 are respectively provided from the inside to the outside. A piston push rod sealing ring is installed in the piston push rod sealing groove 3-4, which is used to achieve dynamic sealing between the push rod of the piston rod 4 and the pneumatic cylinder 3.

[0032] like Figures 7a to 7c As shown, the piston rod 4 includes a piston and a push rod. The piston is arranged inside the cylinder body of the pneumatic cylinder 3. The rear end of the push rod is fixedly connected to the piston, and the front end of the push rod extends out of the piston rod through hole of the pneumatic cylinder 3. The outer periphery of the piston is processed with a piston sealing groove 4-1 for installing a piston sealing ring to achieve dynamic sealing of the piston of the piston rod 4 relative to the pneumatic cylinder 3. The front end of the push rod is processed with a threaded connector 4-2 for installing an adjustment head 6, and the front end surface of the push rod is processed with a fixed threaded hole 4-3 for installing a stopper 7.

[0033] like Figure 8a and 8b As shown, the regulating head 6 is provided with a spring fixing groove 6-1 and a mounting threaded hole 6-2, and the regulating head 6 is fixedly connected to the threaded connector 4-2 of the piston rod 4 through the mounting threaded hole 6-2. A spring 5 is sleeved on the push rod of the piston rod 4, and the front and rear ends of the spring 5 are respectively arranged in the spring fixing groove 6-1 of the regulating head 6 and the spring fixing groove 3-3 of the pneumatic cylinder 3 to limit the lateral freedom of the spring 5, and make the front and rear ends of the spring 5 respectively support the pneumatic cylinder 3 and the regulating head 6. The spring 5 is always in a compressed state, and the flow self-regulating function of the pneumatic flow automatic regulating valve is realized through the air pressure in the pneumatic cylinder 3 and the elastic force of the spring 5. The block 7 is fixedly connected to the fixing threaded hole 4-3 on the front end face of the push rod of the piston rod 4 and the threaded hole on the front end face of the regulating head 6 through a plurality of bolts.

[0034] During use, when the pressurized fluid enters the valve body from the fluid inlet 1-1 of the pneumatic flow automatic regulating valve, the fluid impacts the rear surface of the piston rod 4 through the guide plate 3-2 of the pneumatic cylinder 3, thereby pushing the piston rod 4 to move to compress the gas inside the pneumatic cylinder 3. The piston rod 4 pushes the regulating head 6 to move, so that the outlet opening changes, thereby adjusting the outlet flow. When the inlet fluid pressure decreases, the piston rod 4 moves backward under the action of the internal air pressure of the pneumatic cylinder 3 and compresses the spring 5 at the same time, thereby increasing the outlet opening and stabilizing the outlet flow.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pneumatic flow automatic regulating valve, characterized in that: The pneumatic flow automatic regulating valve comprises a main valve body, a sub-valve body, a pneumatic cylinder, a piston rod, a spring, a regulating head, a stopper and a constant pressure one-way valve; wherein, The main valve body and the auxiliary valve body are butt-assembled by bolts and nuts to form a valve body assembly, and a mounting cavity for accommodating the flow self-regulating valve core is formed inside the butt-assembled valve body assembly; The top and bottom of the inner cavity of the main valve body are respectively provided with a plurality of pneumatic cylinder mounting seats for fixedly connecting with the pneumatic cylinder of the flow self-regulating valve core; the front and rear ends of the inner cavities of the main valve body and the auxiliary valve body are respectively provided with a fluid inlet and a fluid outlet connected with the inner cavity; The pneumatic cylinder, piston rod, spring, adjusting head, stopper and constant pressure one-way valve constitute a flow self-regulating valve core; a plurality of valve body mounting holes are respectively processed at the upper and lower ends of the cylinder body of the pneumatic cylinder, which are mounted on the pneumatic cylinder mounting seat of the main valve body by bolts; a one-way valve mounting threaded hole is provided on the cylinder body of the pneumatic cylinder, and the constant pressure one-way valve is installed at the one-way valve mounting hole by thread, and the internal air pressure of the pneumatic cylinder is adjusted to adapt to different flow pressure conditions; a piston push rod sealing groove and a spring fixing groove are respectively provided at the piston rod through hole on the front end surface of the cylinder body wall of the pneumatic cylinder from the inside to the outside, and a piston push rod sealing ring is installed in the piston push rod sealing groove to realize the dynamic sealing between the piston rod push rod and the pneumatic cylinder; the piston rod comprises two parts, a piston and a push rod, the piston is arranged inside the cylinder body of the pneumatic cylinder, and the rear end of the push rod is fixedly connected to the piston, The front end of the push rod extends out from the piston rod through hole of the pneumatic cylinder; the front end of the push rod is processed with a threaded connector for installing an adjusting head, and the front end face of the push rod is processed with a fixed threaded hole for installing a stopper; the adjusting head is provided with a spring fixing groove and a mounting threaded hole, and the adjusting head is fixedly connected to the threaded connector of the piston rod through the mounting threaded hole, and a spring is sleeved on the push rod of the piston rod, and the front and rear ends of the spring are respectively arranged in the spring fixing groove of the adjusting head and the spring fixing groove of the pneumatic cylinder to limit the lateral freedom of the spring, and make the front and rear ends of the spring respectively support the pneumatic cylinder and the adjusting head, and the spring is always in a compressed state, and the flow self-regulating function is realized by the air pressure in the pneumatic cylinder and the elastic force of the spring; the stopper is fixedly connected to the fixed threaded hole on the front end face of the push rod and the threaded hole on the front end face of the adjusting head by multiple bolts.

2. The pneumatic flow automatic regulating valve according to claim 1, characterized in that: The main valve body and the auxiliary valve body are butt-assembled by bolts and nuts to form a valve body assembly.

3. The pneumatic flow automatic regulating valve according to claim 1, characterized in that: The contact parts of the main valve body and the auxiliary valve body are respectively provided with a main valve body sealing groove and an auxiliary valve body sealing groove, and sealing strips are installed in the sealing grooves to achieve sealing of the valve body assembly.

4. The pneumatic flow automatic regulating valve according to claim 1, characterized in that: The inner diameters of the fluid inlet and the fluid outlet are both smaller than the inner diameter of the inner cavity.

5. The pneumatic flow automatic regulating valve according to claim 1, characterized in that: A guide plate is arranged at the rear of the cylinder body of the pneumatic cylinder to guide the fluid entering the valve body from the fluid inlet to fully impact the piston rod.

6. The pneumatic flow automatic regulating valve according to claim 1, characterized in that: The outer circumference of the piston is processed with a piston sealing groove for installing a piston sealing ring to achieve dynamic sealing of the piston of the piston rod relative to the pneumatic cylinder.

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