Natural gas excess pressure power generation pulse control valve

Abstract

The invention discloses a natural gas excess pressure power generation pulse control valve, which relates to the technical field of pulse control systems and comprises an outer shell, and a spring assembly, a piston assembly and a valve rod assembly are arranged in the outer shell. Wherein the spring assembly comprises a spring, an upper spring seat and a lower spring seat, the piston assembly comprises a piston body and a buffer baffle, and the valve rod assembly comprises a valve rod and a valve ball. The lower spring seat is fixed on the outer shell, and the spring is connected in series between the upper spring seat and the lower spring seat; the piston body is flexibly connected with the buffer baffle, the piston body and the inner wall of the outer shell form a moving pair, and a damping hole is formed in the piston body; the valve ball is fixedly connected with the valve rod; through holes are further formed in the upper spring seat and the lower spring seat, the valve rod and the through holes form a moving pair, a damping block is further arranged on the valve ball, and shaft hole interference fit is formed between the damping block and the damping hole. By means of cavity sealing formed between the valve ball and the piston body, gas storage and pressurization can be achieved, and the purposes of preventing residual pressure gas from flowing back and increasing the flow speed of outlet gas are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse control systems, and particularly to a pulse control valve for natural gas residual pressure power generation. Background Art

[0002] Before natural gas is supplied to users through long-distance pipelines, it must be depressurized at various pressure regulating stations and can only be used after reaching the national specified pressure standard. Currently, the commonly used pressure reduction method is throttling pressure reduction, and a large amount of energy loss will occur during this process. If this part of the residual pressure energy can be recycled, it will bring considerable economic benefits.

[0003] As the core component for residual pressure energy recovery, the performance of the control valve is directly related to the residual pressure recovery efficiency. Currently, a large amount of natural gas pressure energy is wasted, and it is difficult to solve the power supply problem for remote and scattered gas fields. The flow of natural gas ejected from the wellhead is unstable. Although the existing control valves can effectively control the natural gas pressure energy, they cannot effectively prevent gas backflow, and the gas flow rate is also difficult to meet the power generation requirements. The present invention designs a pulse control valve for natural gas residual pressure power generation, which can achieve gas storage and pressurization, prevent gas backflow, and at the same time increase the gas flow rate. Summary of the Invention

[0004] In order to efficiently utilize the natural gas residual pressure energy, the present invention provides a pulse control valve structure that can prevent gas backflow and increase the gas flow rate.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A pulse control valve for natural gas residual pressure power generation includes a housing. Inside the housing, a spring assembly, a piston assembly, and a valve rod assembly are provided. The spring assembly includes a spring, an upper spring seat, and a lower spring seat. The piston assembly includes a piston body and a buffer baffle. The valve rod assembly includes a valve rod and a valve ball. The lower spring seat is fixed on the housing. The spring is connected in series between the upper spring seat and the lower spring seat. The piston body is flexibly connected to the buffer baffle and forms a moving pair with the inner wall of the housing. A damping hole is provided in the piston body. The valve ball is fixedly connected to the valve rod. It is characterized in that: through holes are also provided in the upper spring seat and the lower spring seat. The valve rod forms a moving pair with the through holes. A damping block is also provided on the valve ball. An interference fit between the shaft and the hole is formed between the damping block and the damping hole.

[0006] Preferably, a limit block is provided at the front end of the valve rod, and it is fixedly connected to the valve rod.

[0007] In the above solution, the limit block is in rigid contact with the upper spring seat and compresses the spring when moving with the valve rod.

[0008] Preferably, the damping block is fixedly connected to the valve ball.

[0009] In the above solution, an interference fit between the shaft hole is formed between the damping block and the damping hole. When they are engaged, the valve is in the closed state, and when they are disengaged, the valve is in the open state.

[0010] Preferably, the buffer baffle is arranged at the rearmost part of the valve stem and is fixedly connected to the valve stem.

[0011] In the above solution, the buffer baffle can continue to provide power for the piston body after the valve stem stops moving, preventing the valve from failing to close properly due to insufficient power.

[0012] Preferably, a ball seat is arranged on the piston body, and an overflow hole and a ball seat are arranged on the lower spring seat.

[0013] In the above solution, the residual pressure gas flows into the overflow hole, pushing the piston body to move; the valve ball is placed on the ball seat.

[0014] Preferably, the outer housing is provided with a narrow-diameter air outlet.

[0015] In the above solution, the diameter of the air outlet at the end of the outer housing becomes narrower, aiming to further increase the flow rate of the outlet gas.

[0016] The present invention aims to provide a pulse control valve structure that can prevent gas backflow and increase gas flow rate. Therefore, the existing pulse control valves can all use the technical solutions provided by the present invention.

[0017] The beneficial effects that the present invention can achieve are: by forming a cavity seal between the valve ball and the piston body, gas storage and pressure increase are realized, gas backflow can be prevented, and at the same time, the flow rate of the outlet gas can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. The schematic examples and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0019] In the drawings: Figure 1 It is a schematic diagram of the present invention in the state of valve closing and gas storage and pressure increase; Figure 2 It is a schematic diagram of the present invention in the state of valve opening and releasing pressure energy; Figure 3 It is a schematic diagram of the present invention at the end (start) of a pulse cycle; In the figure: 1 - outer housing; 2 - valve stem; 3 - limit block; 4 - upper spring seat; 5 - spring; 6 - lower spring seat; 7 - ball seat; 8 - valve ball; 9 - damping block; 10 - buffer baffle; 11 - flow hole; 12 - piston body; 13 - damping hole; 14 - narrow-diameter air outlet. Specific embodiments

[0020] The following will combine the accompanying drawings in the embodiments of the present invention Figures 1 to 3 to clearly and completely describe the technical solutions in the embodiments of the present invention; obviously, the described embodiments are only one embodiment of the present invention, rather than all embodiments. The following description of an exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use; based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] A natural gas residual pressure power generation pulse control valve includes an outer housing, in which a spring assembly, a piston assembly and a valve stem assembly are arranged; the spring assembly includes a spring, an upper spring seat and a lower spring seat, the piston assembly includes a piston body and a buffer baffle; the valve stem assembly includes a valve stem and a valve ball; the lower spring seat is fixed on the outer housing, and the spring is connected in series between the upper spring seat and the lower spring seat; the piston body is flexibly connected to the buffer baffle and forms a moving pair with the inner wall of the outer housing. A damping hole is arranged in the piston body, and the valve ball is fixedly connected to the valve stem; through holes are also arranged in the upper spring seat and the lower spring seat, and the valve stem forms a moving pair with the through holes. A damping block is also arranged on the valve ball, and an interference fit between the shaft hole is formed between the damping block and the damping hole; as shown in the accompanying drawings Figure 1 As shown, the working process of the present invention starts when the residual pressure gas enters the cavity from the left side. The residual pressure gas pushes the piston body to start moving to the right through the flow hole on the lower spring seat. A cavity is formed between the piston body and the lower spring seat and starts to store gas; at this time, the damping block fixedly connected to the valve ball and the damping hole on the piston body are in an interference fit state, so the damping block drives the valve ball to move to the right together with the piston body, and the valve stem fixedly connected to the valve ball also starts to move to the right; at the same time, the limit block fixedly connected to the front end of the valve stem contacts the upper spring seat as the valve stem moves and continuously squeezes the spring to the right to achieve power storage, and the buffer baffle fixedly connected to the tail of the valve stem also moves to the right together; the valve stem assembly is subjected to a leftward elastic force during this process. As the distance of the rightward movement increases, the elastic force gradually accumulates until the elastic force received reaches the critical value at which the damping block and the damping hole disengage. In this stage, the valve is in a closed state.

[0022] As shown in the accompanying drawings Figure 2As shown, when the elastic force applied to the valve stem assembly exceeds the critical value, the damping block disengages from the damping hole, and the gas begins to flow and release the stored energy outward; the valve stem moves smoothly to the left under the action of the elastic force, and the valve ball drives the damping block to move to the left together with the valve stem until the valve ball is placed on the ball seat of the lower spring seat; at this stage, the valve is in the open state, and the high-pressure gas accumulated in the cavity flows through the damping hole to the narrow outlet on the right side, providing stable pressure energy for the power generation equipment at the rear end, thus achieving efficient power generation.

[0023] As shown in the attached Figure 3 figure, the valve stem assembly moves to the left, driving the buffer baffle to move to the left as well. The buffer baffle makes flexible contact with the piston body and pushes the piston body to move to the left until the damping hole on the piston body and the damping block re-form an interference fit; at this time, the valve is in the closed state, marking the completion of a complete pulse cycle, and the device returns to the initial state, ready to start the next working cycle.

[0024] In the present invention, for the convenience of description, the relative positional relationships of the various components are all described according to the layout mode of the attached Figure 1 figure of the specification, such as the positional relationships of front, rear, left, right, up, down, middle, etc. are determined according to the layout mode of the attached Figure 1 figure of the specification. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0025] In the present invention, unless otherwise clearly specified and defined, terms such as "set", "connected", "fixed", etc. should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A pulse control valve for power generation using the residual pressure of natural gas, comprising a housing body, in which a spring assembly, a piston assembly and a valve rod assembly are arranged; the spring assembly includes a spring, an upper spring seat and a lower spring seat, the piston assembly includes a piston body and a buffer baffle, and the valve rod assembly includes a valve rod and a valve ball; the lower spring seat is fixed on the housing body, the spring is connected in series between the upper spring seat and the lower spring seat, the piston body is flexibly connected with the buffer baffle and forms a moving pair with the inner wall of the housing body, a damping hole is arranged in the piston body, the valve ball is fixedly connected with the valve rod, and it is characterized in that: Through holes are also provided in the upper spring seat and the lower spring seat, and the valve stem and the through holes form a moving pair. A damping block is also provided on the valve ball, and an interference fit of the shaft hole is formed between the damping block and the damping hole.

2. The pulse control valve for power generation using the residual pressure of natural gas according to claim 1, characterized in that: A limiting block is provided at the front end of the valve stem, and it is fixedly connected to the valve stem.

3. A pulse control valve for natural gas residual pressure power generation according to claim 1, characterized in that: The damping block is fixedly connected to the valve ball.

4. A pulse control valve for natural gas residual pressure power generation according to claim 1, characterized in that: The buffer baffle is arranged at the rearmost part of the valve stem, and it is fixedly connected to the valve stem.

5. A pulse control valve for natural gas residual pressure power generation according to claim 1, characterized in that: The lower spring seat is provided with a flow-through hole and a ball seat.

6. The pulse control valve for power generation using the residual pressure of natural gas according to claim 1, wherein: The piston body is provided with a ball seat.

7. A pulse control valve for power generation using the residual pressure of natural gas according to claim 1, characterized in that: The outer housing is provided with a narrow-diameter air outlet.

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