Underpressure protection valve for large flow

Abstract

The utility model provides an under-pressure protection valve for large flow, and belongs to the technical field of machinery. The problem of poor stability in the prior art is solved. The under-pressure protection valve for the large flow comprises a valve body with a cavity inside, an inlet and an outlet which are communicated with an inner cavity of the valve body are formed in the left side and the right side of the valve body respectively, and the under-pressure protection valve for the large flow further comprises a valve rod, a sealing assembly, an elastic pre-tightening assembly, a first diaphragm and a second diaphragm. The upper end of the valve rod is connected with the elastic pre-tightening assembly, the sealing assembly is located at the lower end of the valve rod, the first diaphragm is fixedly connected to the upper portion of the valve rod, the second diaphragm is fixedly connected to the middle of the valve rod, a first cavity used for arranging the elastic pre-tightening assembly is formed between the first diaphragm and the upper portion of the valve body, and a second cavity is formed between the first diaphragm and the second diaphragm. A constant-pressure pipe is further connected into the valve body, one end of the constant-pressure pipe is communicated with the outlet, and the other end of the constant-pressure pipe is communicated with the second cavity. The under-pressure protection valve for the large flow is high in stability.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to an undervoltage protection valve for large flow rates. Background Technology

[0002] During the transportation of fluid media in pipelines, insufficient transportation pressure may occur. In this case, backflow will occur in the pipeline. To solve this problem, existing pipelines are usually equipped with check valves.

[0003] However, check valves are usually installed separately in the pipeline, which increases the cost of the entire pipeline delivery system. Moreover, the key component of a check valve to achieve its one-way function is a spring, which is prone to damage during long-term operation, resulting in poor stability.

[0004] Existing check valves are typically installed in low-flow pipeline systems. For high-flow pipeline systems, where springs of the appropriate size cannot be used, check valves are usually not employed; instead, pressure gauges are used to monitor the pressure within the pipeline. Clearly, in high-flow pipelines, insufficient pressure necessitates manual maintenance, which is inconvenient in practice. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing an underpressure protection valve for large flow rates that can effectively prevent backflow of fluid media due to insufficient delivery pressure.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A low-pressure protection valve for high flow rates includes a valve body with an internal cavity. The valve body has an inlet and an outlet communicating with its internal cavity on its left and right sides, respectively. The valve body further includes a valve stem, a sealing assembly, an elastic pre-tightening assembly, a first diaphragm, and a second diaphragm. The elastic pre-tightening assembly is connected to the upper part of the valve body. The upper end of the valve stem is connected to the elastic pre-tightening assembly. The sealing assembly is located at the lower end of the valve stem. The first diaphragm is fixed to the upper part of the valve stem, and the second diaphragm is fixed to the middle part of the valve stem. A cavity one for housing the elastic pre-tightening assembly is formed between the first diaphragm and the upper part of the valve body. A cavity two is formed between the first diaphragm and the second diaphragm. A constant pressure tube is also connected to the valve body. One end of the constant pressure tube communicates with the outlet, and the other end communicates with the cavity two.

[0008] In the aforementioned undervoltage protection valve for high flow rates, the elastic preload assembly includes a guide cylinder, a guide post, and a spring. The guide cylinder is fixedly connected to the valve body, the upper end of the guide post is located inside the guide cylinder, the inner side of the first diaphragm is fixedly connected to the lower end of the guide post, the outer side of the second diaphragm is fixedly connected to the valve body, and the spring is sleeved on the guide post with its two ends acting on the valve body and the first diaphragm, respectively.

[0009] In the aforementioned undervoltage protection valve for high flow rate, the upper part of the valve body has a valve cover with an internal cavity and an open lower end. The valve cover is fastened to the upper end of the valve body. The outer edge of the diaphragm is positioned and connected between the valve cover and the valve body. The guide cylinder, guide post and spring are all located inside the valve cover.

[0010] In the aforementioned undervoltage protection valve for high flow rates, the inner edge of the second diaphragm is fixed to the middle of the valve stem, and the outer edge of the second diaphragm is fixed to the inside of the valve body.

[0011] In the aforementioned undervoltage protection valve for high flow rates, the upper end of the valve body has an annular protruding connecting portion, and the outer edge of the diaphragm is fixed to the upper port of the connecting portion.

[0012] In the aforementioned underpressure protection valve for high flow rates, the outer diameter of diaphragm one is larger than that of diaphragm two.

[0013] In the aforementioned underpressure protection valve for high flow rates, the constant pressure tube includes a tubular body that passes through the valve body. The upper end of the body is flush with the bottom of the connecting portion, and the lower end of the body is located at the outlet.

[0014] In the aforementioned underpressure protection valve for high flow rates, the lower end of the body has an inclined chamfer, and the inclined port at the lower end of the body faces outwards towards the outlet.

[0015] In the aforementioned undervoltage protection valve for large flow rates, the valve body has a through connection hole, and the upper end of the main body passes through the connection hole.

[0016] In the aforementioned undervoltage protection valve for high flow rates, the upper end of the body has a protruding flange that abuts against the upper port of the connection hole.

[0017] In the aforementioned undervoltage protection valve for high flow rates, the upper port of the connection hole has a positioning notch that matches the flange, and the flange is fitted into the positioning notch.

[0018] Compared to existing technologies, this underpressure protection valve for high flow rates utilizes a spring that consistently applies an elastic force to diaphragm one. As the fluid medium passes through the valve body, it exerts pressure on diaphragm two. Simultaneously, under the action of the constant pressure tube, the fluid medium at the outlet is guided between diaphragm one and diaphragm two. During normal fluid flow, the valve stem is lifted by the fluid pressure at the inlet. Due to the sealing block at the lower end of the valve stem, this block moves upwards, allowing the fluid medium to enter through the inlet and smoothly exit through the outlet. If the fluid pressure at the inlet is insufficient, the pressure in the cavity between diaphragm one and diaphragm two becomes equal to the outlet pressure. The valve stem moves downwards, and the sealing block at the lower end of the valve stem re-embeds in the valve body's sealing area, keeping the entire valve closed.

[0019] Because the sealing block at the lower end of the valve stem contacts the sealing seat inside the valve body, ensuring the entire valve remains closed, the valve will automatically close for protection purposes when the inlet pressure is insufficient. It can be seen that under pressure, the valve closes primarily due to the pressure on the diaphragm. Compared to ordinary check valves, this protective valve is well-suited for high-flow-rate pipeline systems and has high practical value. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of an underpressure protection valve designed for high flow rates.

[0021] Figure 2 This is a cross-sectional structural diagram of an underpressure protection valve designed for high flow rates.

[0022] In the figure, 1 is the valve body; 1a is the inlet; 1b is the outlet; 1c is the connecting part; 1c1 is the connecting hole; 1c11 is the positioning notch; 2 is the valve stem; 3 is the diaphragm one; 4 is the diaphragm two; 5 is the body; 5a is the retaining edge; 6 is the guide cylinder; 7 is the guide post; 8 is the spring; and 9 is the valve cover. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figure 1 and Figure 2 As shown, the undervoltage protection valve for high flow rates includes a valve body 1 with an internal cavity. The valve body 1 has an inlet 1a and an outlet 1b communicating with its internal cavity on its left and right sides, respectively. It also includes a valve stem 2, a sealing assembly, an elastic pre-tightening assembly, a diaphragm 3, and a diaphragm 4. The elastic pre-tightening assembly is connected to the upper part of the valve body 1. The upper end of the valve stem 2 is connected to the elastic pre-tightening assembly. The sealing assembly is located at the lower end of the valve stem 2. The diaphragm 3 is fixed to the upper part of the valve stem 2. The diaphragm 4 is fixed to the middle part of the valve stem 2. A cavity 1 for housing the elastic pre-tightening assembly is formed between the diaphragm 3 and the upper part of the valve body 1. A cavity 2 is formed between the diaphragm 3 and the diaphragm 4. A constant pressure tube is also connected inside the valve body 1. One end of the constant pressure tube is connected to the outlet 1b, and the other end of the constant pressure tube is connected to the cavity 2.

[0027] The lower end of the valve stem 1 has a sealing structure between it and the valve body 1. The technical features of this part are existing technology. This invention is not intended to solve how to seal between the lower end of the valve stem and the valve body. Therefore, the sealing structure between the lower end of the valve stem 2 and the valve body 1 will not be described again in the embodiments.

[0028] In other words, as long as valve stem 2 is in the downward position, the entire protective valve will be in a closed, sealed state.

[0029] When the pressure of the fluid medium at inlet 1a is within the set range, the pressure in cavity 2 is equal to that in valve body 1 under the action of the constant pressure tube. At this time, the fluid medium enters through inlet 1a, and the fluid medium in valve body 1 is then smoothly discharged through outlet 1b.

[0030] If the input pressure of the fluid medium at inlet 1a is insufficient, the pressure inside cavity 2 will be greater than the pressure at inlet 1a. Under the action of this pressure, valve stem 2 will move downward and put the valve in a sealed closed state. This effectively prevents the fluid medium in the pipeline from flowing back due to insufficient input pressure.

[0031] The elastic pretensioning assembly includes a guide cylinder 6, a guide post 7, and a spring 8. The guide cylinder 6 is fixed inside the valve body 1. The upper end of the guide post 7 is located inside the guide cylinder 6. The inner side of the first diaphragm 3 is fixed to the lower end of the guide post 7. The outer side of the second diaphragm 4 is fixed to the valve body 1. The spring 8 is sleeved on the guide post 7, and the two ends of the spring 8 act on the valve body 1 and the first diaphragm 3, respectively.

[0032] Under the elastic force of spring 8, guide post 7 tends to move downward along guide cylinder 6. When the pressure difference between the two points of the cavity and the pressure at inlet 1a is relatively large, it ensures that valve stem 2 can move smoothly up and down.

[0033] The valve body 1 has a valve cover 9 with an internal cavity and an open bottom at the upper part. The valve cover 9 is fastened to the upper end of the valve body 1. The outer edge of the diaphragm 3 is positioned and connected between the valve cover 9 and the valve body 1. The guide cylinder 6, guide post 7 and spring 8 are all located inside the valve cover 9.

[0034] This structure allows the elastic preload assembly to be located separately in one part of the cavity, avoiding direct impact from the fluid medium on the elastic preload assembly during operation.

[0035] The inner edge of the second diaphragm 4 is fixedly connected to the middle of the valve stem 2, and the outer edge of the second diaphragm 4 is fixedly connected to the inner side of the valve body 1.

[0036] The valve body 1 has an annular protruding connecting part 1c at its upper end, and the outer edge of the diaphragm 3 is fixed to the upper port of the connecting part 1c.

[0037] This structure ensures that cavity two is large enough, ultimately ensuring that the pressure at cavity two is as close as possible to the pressure at outlet 1b.

[0038] The outer diameter of diaphragm 3 is larger than that of diaphragm 4.

[0039] This structure provides a stable buffer for the valve stem 2, preventing it from moving excessively long distances.

[0040] The constant pressure tube includes a tubular body 5, which is installed on the valve body 1. The upper end of the body 5 is flush with the bottom of the connecting part 1c, and the lower end of the body 5 is located at the outlet 1b.

[0041] The lower end of the body 5 has an inclined chamfer, and the inclined port at the lower end of the body 5 faces outward from the outlet 1b.

[0042] In the event of undervoltage, this structure can smoothly guide the fluid medium at outlet 1b to cavity 2.

[0043] The valve body 1 has a through connection hole 1c, and the upper end of the main body 5 passes through the connection hole 1c.

[0044] The upper end of the body 5 has a protruding flange 5a, which abuts against the upper port of the connecting hole 1c1.

[0045] The upper end of the connecting hole 1c1 has a positioning recess 1c11 that matches the stop edge 5a, and the stop edge 5a is embedded in the positioning recess 1c11.

[0046] The retaining edge 5a has two functions:

[0047] Firstly, the main body 5 is positioned to prevent it from falling out of the valve body 1.

[0048] Secondly, after the stop 5a on the body 5 is engaged with the positioning notch 1c11, the lower port of the body 5, which is tilted, can stably face the outside of the outlet 1b.

[0049] This underpressure protection valve, designed for high-flow-rate applications, utilizes a spring that continuously applies an elastic force to diaphragm one. As the fluid medium passes through the valve body, it exerts pressure on diaphragm two. Simultaneously, under the action of the constant pressure tube, the fluid medium at the outlet is guided between diaphragm one and diaphragm two. During normal fluid flow, the valve stem is lifted by the fluid pressure at the inlet. Due to the sealing block at the lower end of the valve stem, this block moves upwards, allowing the fluid medium to enter through the inlet and smoothly exit through the outlet. If the fluid pressure at the inlet is insufficient, the pressure in the cavity between diaphragm one and diaphragm two becomes equal to the outlet pressure. The valve stem moves downwards, and the sealing block at the lower end of the valve stem re-engages in the valve body's sealing area, keeping the entire valve closed.

[0050] Because the sealing block at the lower end of the valve stem contacts the sealing seat inside the valve body, ensuring the entire valve remains closed, the valve will automatically close for protection purposes when the inlet pressure is insufficient. It can be seen that under pressure, the valve closes primarily due to the pressure on the diaphragm. Compared to ordinary check valves, this protective valve is well-suited for high-flow-rate pipeline systems and has high practical value.

[0051] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A large-flow undervoltage protection valve, comprising a valve body (1) with an internal cavity, wherein the left and right sides of the valve body (1) respectively have an inlet (1a) and an outlet (1b) communicating with the internal cavity, characterized in that, It also includes a valve stem (2), a sealing assembly, an elastic pre-tightening assembly, a diaphragm one (3) and a diaphragm two (4). The elastic pre-tightening assembly is connected to the upper part of the valve body (1). The upper end of the valve stem (2) is connected to the elastic pre-tightening assembly. The sealing assembly is located at the lower end of the valve stem (2). The diaphragm one (3) is fixed to the upper part of the valve stem (2). The diaphragm two (4) is fixed to the middle part of the valve stem (2). A cavity one for setting the elastic pre-tightening assembly is formed between the diaphragm one (3) and the upper part of the valve body (1). A cavity two is formed between the diaphragm one (3) and the diaphragm two (4). A constant pressure tube is also connected inside the valve body (1). One end of the constant pressure tube is connected to the outlet (1b), and the other end of the constant pressure tube is connected to the cavity two.

2. The undervoltage protection valve for large flow rates according to claim 1, characterized in that, The elastic pretensioning assembly includes a guide cylinder (6), a guide post (7), and a spring (8). The guide cylinder (6) is fixed inside the valve body (1). The upper end of the guide post (7) is located inside the guide cylinder (6). The inner side of the first diaphragm (3) is fixed to the lower end of the guide post (7). The outer side of the second diaphragm (4) is fixed to the valve body (1). The spring (8) is sleeved on the guide post (7), and the two ends of the spring (8) act on the valve body (1) and the first diaphragm (3) respectively.

3. The undervoltage protection valve for large flow rates according to claim 2, characterized in that, The valve body (1) has a valve cover (9) with an internal cavity and an open bottom at the upper part. The valve cover (9) is fastened to the upper end of the valve body (1). The outer edge of the diaphragm (3) is positioned and connected between the valve cover (9) and the valve body (1). The guide cylinder (6), guide post (7) and spring (8) are all located inside the valve cover (9).

4. The undervoltage protection valve for large flow rates according to claim 3, characterized in that, The inner edge of the second diaphragm (4) is fixed to the middle of the valve stem (2), and the outer edge of the second diaphragm (4) is fixed to the inner side of the valve body (1).

5. The undervoltage protection valve for high flow rates according to claim 4, characterized in that, The valve body (1) has an annular protruding connecting part (1c) at its upper end, and the outer edge of the diaphragm (3) is fixed to the upper port of the connecting part (1c).

6. The undervoltage protection valve for high flow rates according to claim 5, characterized in that, The outer diameter of diaphragm one (3) is larger than that of diaphragm two (4).

7. The undervoltage protection valve for large flow rates according to claim 6, characterized in that, The constant pressure tube includes a tubular body (5) which is mounted on the valve body (1). The upper end of the body (5) is flush with the bottom of the connecting part (1c), and the lower end of the body (5) is located at the outlet (1b).

8. The undervoltage protection valve for large flow rates according to claim 7, characterized in that, The lower end of the body (5) has an inclined chamfer and the inclined port at the lower end of the body (5) faces outward.

9. The undervoltage protection valve for large flow rates according to claim 8, characterized in that, The valve body (1) has a through connection hole (1c1), and the upper end of the main body (5) passes through the connection hole (1c1).

10. The undervoltage protection valve for high flow rates according to claim 9, characterized in that, The upper end of the body (5) has a protruding flange (5a), which abuts against the upper port of the connecting hole (1c1).

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