Air pressure type flow automatic regulating valve

Abstract

This invention proposes a pneumatic automatic flow regulating valve, comprising a main valve body, a secondary valve body, a pneumatic cylinder, a piston rod, a spring, an adjusting head, a stop block, a constant pressure check valve, and multiple bolts and nuts. The main valve body and the secondary valve body are assembled together by bolts and nuts, with inlet and outlet pipelines connected at their left and right ends. Both the main and secondary valve bodies are designed with sealing grooves, and sealing strips are installed to achieve valve body sealing. The pneumatic cylinder, piston rod, spring, adjusting head, and stop block form a flow self-regulating valve core, which adjusts the outlet opening according to changes in inlet flow pressure, thereby stabilizing the outlet flow. This invention has a small overall size. By utilizing pneumatic pressure and a spring to receive changes in fluid pressure and adjust the outlet opening, the sensitivity of the regulating valve is greatly enhanced, achieving automatic regulation of fluid flow and stabilizing the outlet flow. Furthermore, by adjusting the pneumatic pressure and spring stiffness, it can adapt to various flow pressure conditions.

Description

Technical Field

[0001] This invention belongs to the field of fluid transmission technology, and specifically relates to a pneumatic automatic flow regulating valve. Background Technology

[0002] Flow stabilizing valves are indispensable equipment in the oilfield production field. During the oilfield production process, some pipeline oil transportation requires stable flow. However, the existing flow control methods are still mainly based on manual adjustment of valve opening. When the flow pressure is unstable, manual adjustment is required repeatedly, which not only has high labor costs and slow response, but also causes great wear on the valve and can easily lead to production hazards. Meanwhile, in the field of hydraulic fracturing technology, when too much fracturing fluid enters the reservoir, some of the fluid needs to be discharged through a relatively stable flow rate. A common method is to insert a nozzle of a certain inner diameter into the nozzle sleeve of the surface wellhead or oil pipeline for fluid discharge. When the internal pressure changes and needs to be adjusted, the well needs to be shut in, vented, 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 has a large manpower consumption. Chinese patent application CN201710310221.2 discloses an automatic regulating valve for fracturing fluid backflow. The regulating valve has a large overall size, and because the fluid inlet of the automatic pressure regulating assembly is small, the overall flow rate is small, resulting in a large back pressure in the upstream pipeline and a large pressure difference before and after the assembly, thus making it insensitive to changes in flow pressure. Chinese patent application CN202010017495.4 discloses a flow stabilizing valve that uses a fluid medium to drive a hollow ball valve to adjust the outlet opening. Because it has a ball valve sealing structure at the outlet, it will directly seal the outlet when the inlet flow pressure is too high, causing internal pressure buildup in the pipeline and posing a safety hazard. In addition, ball valves of different masses are required for different flow pressure changes, and the control valve can only be placed upright and cannot be inverted. If installed upside down, the ball valve's own weight will cause the outlet to seal, resulting in functional failure. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] This invention proposes a pneumatic automatic flow regulating valve to solve the technical problems of manually adjusting the outlet opening based on the flow pressure to stabilize the outlet flow during the backflow of fracturing fluid in oil extraction and fracturing technology, as well as the poor sensitivity, large size, and unsuitability for field use of existing automatic regulating devices. The valve can automatically adjust the outlet opening according to the changes in the flow pressure inside the pipeline, stabilize the outlet flow of the valve body, and achieve stable output of fracturing fluid in oil extraction and fracturing technology.

[0005] (II) Technical Solution

[0006] To address the aforementioned technical problems, this invention proposes a pneumatic automatic flow regulating valve, which includes a main valve body, a secondary valve body, a pneumatic cylinder, a piston rod, a spring, an adjusting head, a stop block, and a constant pressure check valve; wherein...

[0007] The main valve body and the auxiliary valve body are assembled by bolts and nuts to form a valve body assembly. After assembly, the valve body assembly forms an installation cavity to accommodate the flow self-regulating valve core.

[0008] Multiple pneumatic cylinder mounting seats are provided at the top and bottom of the inner cavity of the main valve body for fixed connection with the pneumatic cylinder of the flow self-regulating valve core; fluid inlet and fluid outlet communicating with the inner cavity are respectively provided at the front and rear ends of the inner cavity of the main valve body and the auxiliary valve body.

[0009] The pneumatic cylinder, piston rod, spring, adjusting head, stop block, and constant pressure check valve constitute a flow self-regulating valve core. Multiple valve body mounting holes are machined at both ends of the pneumatic cylinder body, which are bolted to the pneumatic cylinder mounting seat on the main valve body. A check valve mounting threaded hole is provided on the pneumatic cylinder body; the constant pressure check valve is threadedly installed at the check valve mounting hole, allowing adjustment of the internal air pressure of the pneumatic cylinder to adapt to different flow pressure conditions. At the piston rod through-hole on the front end face of the inner wall of the pneumatic cylinder body, from the inside out, there are piston push rod sealing grooves and spring fixing grooves. A piston push rod sealing ring is installed in the piston push rod sealing groove to achieve a dynamic seal between the piston push rod and the pneumatic cylinder. The piston rod consists of two parts: a piston and a push rod. The piston is located inside the pneumatic cylinder body, and the rear end of the push rod is fixedly connected to the piston. The front end of the push rod extends from the piston rod through-hole of the pneumatic cylinder. A threaded connector is machined at the front end of the push rod for mounting the adjusting head, and a fixed threaded hole is machined on the front end face of the push rod for mounting the stop. The adjusting head has a spring fixing groove and a mounting threaded hole, and is fixedly connected to the threaded connector of the piston rod through the mounting threaded hole. A spring is fitted onto the piston rod push rod, with its front and rear ends respectively positioned in the spring fixing groove of the adjusting head and the spring fixing groove of the pneumatic cylinder to restrict the lateral freedom of the spring and ensure that its front and rear ends press against the pneumatic cylinder and the adjusting head, keeping the spring in a compressed state. The flow rate self-regulation function is achieved through the interaction of the air pressure inside the pneumatic cylinder and the spring's elastic force. The stop 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 assembled by bolts and nuts to form a valve body assembly.

[0011] Furthermore, the contact areas between 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 a sealing strip is installed in the sealing groove to achieve the sealing of the valve body assembly.

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

[0013] Furthermore, a guide vane 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, the piston has a piston sealing groove machined on its outer circumference for installing a piston sealing ring, thereby achieving a dynamic seal between the piston rod and the pneumatic cylinder.

[0015] (III) Beneficial Effects

[0016] This invention proposes a pneumatic automatic flow regulating valve, comprising a main valve body, a secondary valve body, a pneumatic cylinder, a piston rod, a spring, an adjusting head, a stop block, a constant pressure check valve, and multiple bolts and nuts. The main valve body and secondary valve body are assembled together by bolts and nuts, with inlet and outlet pipelines connected at their left and right ends. Both the main and secondary valve bodies are designed with sealing grooves, and sealing strips are installed to achieve valve body sealing. The pneumatic cylinder, piston rod, spring, adjusting head, and stop block form a flow self-regulating valve core, which adjusts the outlet opening according to changes in inlet flow pressure, thereby stabilizing the outlet flow. This invention has a small overall size. By utilizing pneumatic pressure and a spring to receive fluid pressure changes and adjust the outlet opening, the sensitivity of the regulating valve is greatly enhanced, achieving automatic regulation of fluid flow and stabilizing the outlet flow. Furthermore, by adjusting the pneumatic pressure and spring stiffness, it can adapt to various flow pressure conditions. This invention has a simple structure, strong adaptability, and is easy to manufacture, possessing certain practical applications. Attached Figure Description

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

[0018] Figure 2 This 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 This is a schematic diagram of the internal structure of the secondary valve body. Figure 4b for Figure 4a AA section view;

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

[0022] Figure 6a This is a schematic diagram of a pneumatic cylinder. Figure 6b for Figure 6a AA section view, Figure 6cThis is a side view;

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

[0024] Figure 8a This is a schematic diagram of the adjusting head structure. Figure 8b for Figure 8a AA sectional view. Detailed Implementation

[0025] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

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

[0027] The main valve body 1 and the auxiliary valve body 2 are assembled by bolts and nuts to form a valve body assembly. The valve body assembly after assembly forms an installation cavity to accommodate the flow self-regulating valve core.

[0028] like Figure 3a and 3b As shown in 4a and 4b, the contact area between the main valve body 1 and the auxiliary valve body 2 is provided with a main valve body sealing groove 1-4 and an auxiliary valve body sealing groove 2-1, respectively. A sealing strip is installed in the sealing groove to achieve sealing of the valve body assembly.

[0029] The main valve body 1 has multiple pneumatic cylinder mounting seats 1-2 at the top and bottom of its inner cavity, which are used to fix and connect 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 communicating with the inner cavity. The inner diameters of both the fluid inlet 1-1 and the fluid outlet 1-3 are smaller than the inner diameter of the inner cavity. The auxiliary valve body 2 also has an inner cavity and fluid inlets and outlets.

[0030] The pneumatic cylinder 3, piston rod 4, spring 5, adjusting head 6, stop block 7, and constant pressure check valve 8 form a flow self-regulating valve core, such as... Figure 5 As shown.

[0031] like Figures 6a-6cAs shown, the upper and lower ends of the cylinder body of the pneumatic cylinder 3 are machined with multiple valve body mounting holes, which are bolted to the pneumatic cylinder mounting seat 1-2 of the main valve body 1. A one-way valve mounting threaded hole 3-1 is provided on the cylinder body of the pneumatic cylinder 3. The constant pressure one-way valve 8 is threadedly installed at the one-way valve mounting hole 3-1, allowing adjustment of the internal air pressure of the pneumatic cylinder 3 to adapt to different flow pressure conditions. A flow guide plate 3-2 is provided at the rear of the cylinder body of the pneumatic cylinder 3 to guide the fluid entering the valve body from the fluid inlet to fully impact the piston rod 4, improving the flow pressure sensitivity of the flow self-regulating valve core. At the piston rod through hole on the front end face of the inner wall of the pneumatic cylinder 3, from the inside to the outside, there are piston push rod sealing grooves 3-4 and spring fixing grooves 3-3. A piston push rod sealing ring is installed in the piston push rod sealing groove 3-4 to achieve a dynamic seal between the piston rod 4 and the pneumatic cylinder 3.

[0032] like Figures 7a-7c As shown, the piston rod 4 comprises a piston and a push rod. The piston is housed 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 from the piston rod through-hole of the pneumatic cylinder 3. A piston sealing groove 4-1 is machined on the outer circumference of the piston for installing a piston sealing ring, achieving a dynamic seal between the piston of the piston rod 4 and the pneumatic cylinder 3. A threaded connector 4-2 is machined on the front end of the push rod for installing an adjusting head 6, and a fixed threaded hole 4-3 is machined on the front end face of the push rod for installing a stop block 7.

[0033] like Figure 8a and 8b As shown, the adjusting head 6 is provided with a spring fixing groove 6-1 and a mounting threaded hole 6-2. The adjusting 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. The front and rear ends of the spring 5 are respectively located in the spring fixing groove 6-1 of the adjusting head 6 and the spring fixing groove 3-3 of the pneumatic cylinder 3 to restrict the lateral freedom of the spring 5 and to make the front and rear ends of the spring 5 press against the pneumatic cylinder 3 and the adjusting head 6 respectively. The spring 5 is always in a compressed state. Through the air pressure in the pneumatic cylinder 3 and the elastic force of the spring 5, the flow self-adjustment function of this pneumatic automatic flow regulating valve is realized. The stop block 7 is fixedly connected to the fixing threaded hole 4-3 on the front end face of the piston rod 4 and the threaded hole on the front end face of the adjusting head 6 by multiple bolts.

[0034] In use, when pressurized fluid enters the valve body through the fluid inlet 1-1 of the pneumatic automatic flow 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 and compress the gas inside the pneumatic cylinder 3. The piston rod 4 then pushes the regulating head 6 to move, causing the outlet opening to change, thereby regulating the outlet flow. When the inlet fluid pressure decreases, the piston rod 4 moves backward under the action of the air pressure inside the pneumatic cylinder 3 and compresses the spring 5, thereby increasing the outlet opening and stabilizing the outlet flow.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pneumatic automatic flow regulating valve, characterized in that, The pneumatic automatic flow regulating valve includes a main valve body, a secondary valve body, a pneumatic cylinder, a piston rod, a spring, an adjusting head, a stop block, and a constant pressure check valve; wherein... The main valve body and the auxiliary valve body are assembled by bolts and nuts to form a valve body assembly. After assembly, the valve body assembly forms an installation cavity to accommodate the flow self-regulating valve core. Multiple pneumatic cylinder mounting seats are provided at the top and bottom of the inner cavity of the main valve body for fixed connection with the pneumatic cylinder of the flow self-regulating valve core; fluid inlet and fluid outlet communicating with the inner cavity are respectively provided at the front and rear ends of the inner cavity of the main valve body and the auxiliary valve body. The pneumatic cylinder, piston rod, spring, adjusting head, stop, and constant pressure check valve constitute a flow self-regulating valve core. Multiple valve body mounting holes are machined at both ends of the pneumatic cylinder body, which are bolted to the pneumatic cylinder mounting seat on the main valve body. A check valve mounting threaded hole is provided on the pneumatic cylinder body; the constant pressure check valve is threadedly installed at the check valve mounting hole to adjust the internal air pressure of the pneumatic cylinder to adapt to different flow pressure conditions. At the piston rod through-hole on the front end face of the inner wall of the pneumatic cylinder body, a piston push rod sealing groove and a spring fixing groove are respectively provided from the inside to the outside. A piston push rod sealing ring is installed in the piston push rod sealing groove to achieve a dynamic seal between the piston rod push rod and the pneumatic cylinder. The piston rod consists of a piston and a push rod; the piston is located inside the pneumatic cylinder body, and the rear end of the push rod is fixedly connected to the piston. The front end of the rod extends from the piston rod through-hole of the pneumatic cylinder; the front end of the push rod is machined with a threaded connector for installing the adjusting head, and the front end face of the push rod is machined with a fixing threaded hole for installing the stop; 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; a spring is sleeved on the push rod of the piston rod, and the front and rear ends of the spring are respectively set in the spring fixing groove of the adjusting head and the spring fixing groove of the pneumatic cylinder to restrict the lateral freedom of the spring, and so that the front and rear ends of the spring respectively press against the pneumatic cylinder and the adjusting head, and the spring is always in a compressed state. Through the cooperation of the air pressure in the pneumatic cylinder and the elastic force of the spring, the flow self-adjustment function is realized; the stop is fixedly connected to the fixing 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 automatic flow regulating valve as described in claim 1, characterized in that, The main valve body and the auxiliary valve body are assembled by bolts and nuts to form a valve body assembly.

3. The pneumatic automatic flow regulating valve as described in claim 1, characterized in that, The contact area between the main valve body and the auxiliary valve body is provided with a main valve body sealing groove and an auxiliary valve body sealing groove, respectively. A sealing strip is installed in the sealing groove to achieve sealing of the valve body assembly.

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

5. The pneumatic automatic flow regulating valve as described in claim 1, characterized in that, The rear of the cylinder body of the pneumatic cylinder is provided with a guide plate to guide the fluid entering the valve body from the fluid inlet to fully impact the piston rod.

6. The pneumatic automatic flow regulating valve as described in claim 1, characterized in that, The piston has a piston sealing groove machined on its outer circumference for installing a piston sealing ring, thereby achieving a dynamic seal between the piston rod and the pneumatic cylinder.

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