A pipeline back pressure valve for stable liquid metering and transportation

Abstract

The present invention discloses a pipeline back pressure valve for stable liquid metering and transportation, and relates to the field of pipeline components. The back pressure valve comprises: a base and a pedestal closely connected to each other, a connected cavity is formed inside the base and the pedestal, a discharge channel and a discharge port connected to the cavity are provided on the base, and a feed channel and a feed port connected to the cavity are provided on the pedestal; a pressure ball is arranged in the cavity, located above the feed channel, and blocks the feed channel by its own gravity; a screw mandrel is arranged in the cavity, and located above the pressure ball. The screw mandrel can move up and down to adjust the area of ​​the discharge channel blocked by its side wall, so as to achieve the purpose of adjusting the internal pressure of the back pressure valve, and can also maintain a predetermined pressure when conveying various media and liquids of different viscosities. The present invention uses a combination of a pressure ball and a screw mandrel to adjust the pressure. Compared with the combined adjustment of a spring and a diaphragm, the present invention is less affected and has a better effect of controlling pressure, and has a longer service life and lower maintenance costs.

Description

Technical Field

[0001] The invention relates to the field of pipeline components, and in particular to a pipeline back pressure valve for stable liquid metering and transportation. Background Art

[0002] Back pressure valve is a pipeline component that can maintain the required pressure of the pipeline when the pressure of the pipeline or equipment container is unstable, so that the pump can output the flow normally and stably, and at the same time reduce the flow and pressure fluctuations caused by siphoning. Back pressure valves are often used in fluid metering and dosing systems, hydraulic control systems, and critical state control.

[0003] As the back pressure valve is used more and more widely, the conveyed media has also become more diverse. However, the spring type back pressure valve is sensitive to the viscosity change of the liquid. When it is necessary to maintain a constant pressure to convey the rubber, it is difficult to meet the use of different rubbers with a large viscosity range. In addition, the service life of the spring and diaphragm also changes due to the influence of different pressures and flows. Regular inspection and replacement are required, and the repair and maintenance costs are relatively high. Summary of the invention

[0004] In order to solve the problem that when the conveyed medium becomes diverse, the existing spring back pressure valve is difficult to maintain constant pressure during operation, cannot meet the use of different rubber materials with a large viscosity range, and leads to high maintenance costs, the inventor proposes the following technical solution.

[0005] A pipeline back pressure valve for stable liquid metering and delivery, comprising:

[0006] A base and a pedestal tightly connected to each other; a connected cavity is formed inside the base and the pedestal, the base is provided with a discharge channel laterally connected to the cavity, one end of the discharge channel connected to the cavity is a pressure regulating port, and the other end is a discharge port of the back pressure valve; the pedestal is provided with a feed channel connected to the cavity, and the outer end of the feed channel is a feed port of the back pressure valve;

[0007] A pressure ball is arranged in the cavity, located above the feed channel, and blocks the feed channel by its own gravity;

[0008] The main body of the screw core shaft is arranged in the cavity; the screw core shaft can move back and forth to adjust the area of ​​the pressure regulating port blocked by the side wall of the screw core shaft.

[0009] Furthermore, the back pressure valve also includes: an adjusting flange cover connected to the base; the top end of the screw mandrel passes through the base and extends into the inner cavity of the adjusting flange cover.

[0010] Furthermore, the back pressure valve further comprises: a pressure gauge, and the pressure gauge is connected to the feed channel.

[0011] Furthermore, the back pressure valve also includes: a sealing gasket, which is arranged between the feed channel and the pressure ball; the upper surface of the sealing gasket is in contact with the bottom surface of the pressure ball, the outer peripheral side of the sealing gasket is in close contact with the inner wall of the cavity, and a channel is opened in the middle of the sealing gasket to pass through the upper and lower parts; the channel is connected to the feed channel downward and contacts the bottom surface of the pressure ball upward.

[0012] Preferably, the surface of the sealing gasket that contacts the bottom surface of the pressure ball is conical.

[0013] Furthermore, the screw core shaft includes an upper section, a middle section and a lower section; the middle section of the screw core shaft can block the pressure regulating port; the end of the screw core shaft close to the pressure ball is its lower section, and the lower section is provided with a first external thread; the top of the first external thread can fit with the middle and lower inner wall of the cavity, and the groove of the first external thread is used for passing liquid; the middle and lower part of the cavity is located below the pressure regulating port and above the pressure ball.

[0014] Furthermore, the upper section of the screw core shaft is provided with a second external thread with a smaller diameter than its middle section; a constriction is provided on the upper part of the base, and an internal thread is provided on the inner wall of the constriction; the second external thread is adaptively connected to the internal thread; when the screw core shaft moves upward until the upper annular surface of its middle section presses against the bottom end of the constriction, the movement stops and the pressure regulating port is opened to the maximum.

[0015] Furthermore, the diameter of the lower section of the screw core shaft is smaller than the diameter of the middle section; the lower annular surface of the middle section of the screw core shaft can move downward to below the pressure regulating port, and finally abut against the upper end surface of the middle and lower part of the cavity to completely block the liquid in the middle and lower part of the cavity from entering the discharge channel.

[0016] Furthermore, a scraper is embedded on the inner wall of the cavity, the scraper is located above the pressure regulating port, and the scraper is annularly arranged and closely fits the screw core shaft.

[0017] Preferably, the bottom surface of the scraper is a slope with a high outer circumference and a low inner ring.

[0018] The beneficial effects of the present invention are:

[0019] 1. The back pressure valve uses a screw core shaft and a pressure ball to adjust the pressure. It can maintain the predetermined pressure when conveying various media and liquids of different viscosities. Compared with the existing spring pressure regulation, it is less affected and has a better effect of controlling pressure.

[0020] 2. The internal parts of the back pressure valve are precisely matched with the screw core shaft, making it highly flexible in movement; the combination of the screw core shaft and the pressure ball has a longer service life and lower maintenance cost than the existing combination of springs and diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the internal cross-sectional structure of a pipeline back pressure valve for stable liquid metering and transportation provided by an embodiment;

[0023] Figure 2 The figure is an external view of a pipeline back pressure valve for stable liquid metering and delivery provided by an embodiment.

[0024] Figure numerals: base 1; base 2; discharge channel 3; pressure regulating port 31; discharge port 32; feed channel 4; feed port 41; pressure ball 5; screw core shaft 6; adjusting flange cover 7; pressure gauge 8; sealing gasket 9. DETAILED DESCRIPTION

[0025] The embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example

[0027] See also Figure 1 , which is a schematic diagram of the internal cross-sectional structure of a pipeline back pressure valve for stable liquid metering and transportation according to the present invention.

[0028] See also Figure 2 , is an external view of a pipeline back pressure valve for stable liquid metering and delivery according to the present invention. The back pressure valve comprises:

[0029] A base 1 and a base 2 are tightly connected to each other; a connected cavity is formed inside the base 1 and the base 2, and the base 1 is provided with a discharge channel 3 laterally connected to the cavity, one end of the discharge channel 3 connected to the cavity is a pressure regulating port 31, and the other end is a discharge port 32 of the back pressure valve; the base 2 is provided with a feed channel 4 connected to the cavity, and the outer end of the feed channel 4 is a feed port 41 of the back pressure valve;

[0030] A pressure ball 5 is disposed in the cavity, located above the feed channel 4, and blocks the feed channel 4 by its own gravity; in one embodiment, the pressure ball 5 is a steel ball;

[0031] The main body of the screw core shaft 6 is disposed in the cavity; the screw core shaft 6 can reciprocate to adjust the area of ​​the pressure regulating port 31 blocked by the side wall of the screw core shaft 6 .

[0032] The back pressure valve of this embodiment uses a screw mandrel 6 and a pressure ball 5 to adjust the pressure. It can maintain a predetermined pressure when conveying various media and liquids of different viscosities. Compared with the traditional spring pressure adjustment, it is less affected and has a better effect of controlling the pressure. The internal components of the back pressure valve are precisely matched with the screw mandrel, making it highly flexible in action; the combination of the screw mandrel 6 and the pressure ball 5 has a longer service life and lower maintenance cost than the existing combination of springs and diaphragms.

[0033] Furthermore, in one preferred embodiment, the back pressure valve further comprises:

[0034] The adjusting flange cover 7 is connected to the base 1; the top end of the screw mandrel 6 passes through the base 1 and extends into the inner cavity of the adjusting flange cover 7. When the pressure needs to be adjusted, the adjusting flange cover 7 is opened, and the screw mandrel 6 can be moved to adjust the pressure.

[0035] Furthermore, in one preferred embodiment, the back pressure valve further comprises:

[0036] A pressure gauge 8 is connected to the feed channel 4. The pressure gauge 8 is added to clearly display the current fluid pressure value of the back pressure valve, so that the pressure can be adjusted to the target value according to the displayed pressure.

[0037] Furthermore, in one preferred embodiment, the back pressure valve further comprises:

[0038] The sealing gasket 9 is arranged between the feed channel 4 and the pressure ball 5. The upper surface of the sealing gasket 9 is in contact with the bottom surface of the pressure ball 5, and the outer peripheral side of the sealing gasket 9 is in close contact with the inner wall of the cavity. A vertically penetrating hole is provided in the middle of the sealing gasket 9. The hole is connected to the feed channel downward and contacts the bottom surface of the pressure ball 5 upward.

[0039] In one preferred embodiment, the surface of the sealing gasket 9 that contacts the bottom surface of the pressure ball 5 is conical. Setting the contact surface to be conical can reduce the contact area between the sealing gasket 9 and the pressure ball 5, and prevent the formation of a large vacuum resistance, because a large vacuum resistance requires a large feed pressure, which may damage the pressure valve.

[0040] In one of the preferred embodiments, specifically, the screw core shaft 6 includes an upper section, a middle section and a lower section; the middle section of the screw core shaft 6 can block the pressure regulating port 31; the end of the screw core shaft 31 close to the pressure ball 5 is its lower section, and the lower section is provided with a first external thread; the top of the first external thread can fit with the middle and lower inner wall of the cavity, and the tooth groove of the first external thread is used to pass the liquid. The use of the thread groove to circulate the liquid can change the flow path of the liquid and make the liquid dispersed more evenly. Among them, the middle and lower part of the cavity is located below the pressure regulating port 31 and above the pressure ball 5.

[0041] In one of the preferred embodiments, the upper section of the screw core shaft 6 is provided with a second external thread with a diameter smaller than that of the middle section; a constriction is provided on the upper part of the base 1, and an internal thread is provided on the inner wall of the constriction; the second external thread is adapted to be connected with the internal thread; the screw core shaft 6 moves upward until the upper annular surface of the middle section presses against the bottom end of the constriction, and the movement stops, at which time, the pressure regulating port 31 is opened to the maximum.

[0042] In one of the preferred embodiments, the diameter of the lower section of the screw core shaft 6 is smaller than the diameter of the middle section; the lower annular surface of the middle section of the screw core shaft 6 can move downward to below the pressure regulating port 31, and finally abut against the upper end surface of the middle and lower part of the cavity to completely block the liquid in the middle and lower part of the cavity from entering the discharge channel 3. At this time, the screw core shaft 6 moves downward to the maximum distance.

[0043] The maximum up and down movement distance of the screw core shaft 6 is its adjustment stroke. By adjusting the up and down movement of the screw core shaft 6 within the adjustment stroke, the inlet size of the discharge channel 3 can be reasonably adjusted, thereby further achieving the purpose of controlling the fluid pressure.

[0044] In order to prevent the liquid from seeping upward out of the back pressure valve, the middle section of the screw core shaft 6 can be directly in close contact with the cavity wall, or a scraper (not shown in the drawings) can be embedded on the inner wall of the cavity.

[0045] When the middle section of the screw core shaft 6 is arranged to be in close contact with the cavity wall, the liquid entering upward cannot pass through the middle and upper section of the cavity, but can only pass through the pressure regulating port 31 and be discharged from the discharge port 32 .

[0046] When a scraper is embedded on the inner wall of the cavity, the scraper is arranged above the pressure regulating port 31, and the scraper surrounds and fits tightly to the middle section of the screw core shaft 6. The bottom surface of the scraper can be set as an inclined surface with a high outer periphery and a low inner ring. When feeding, the liquid rushes into the cavity of the back pressure valve, and when the screw core shaft 6 with liquid moves upward, the liquid is blocked by the scraper inclined downward and falls back to the pressure regulating port 31, thereby improving the utilization rate of the liquid.

[0047] Multiple O-rings are used to seal the internal connections of the back pressure valve to prevent liquid from leaking out of the back pressure valve.

[0048] The back pressure valve of the present invention is suitable for the pressure-stabilized transmission of liquids, and the liquids may be liquids with relatively high viscosity such as colloids and oils, or liquids with relatively low viscosity such as water.

[0049] The working process of the pipeline back pressure valve for stable liquid metering and delivery of the present invention is as follows: open the regulating flange cover 7, rotate the screw core shaft 6 to move it upward or downward, so as to control the size of the pressure regulating port 31 for pressure regulation. When the liquid is passed into the back pressure valve, the liquid first enters the feed channel 4 of the base 2 from the feed port 41, passes through the middle hole of the sealing gasket 9, and the liquid has an upward pressure on the pressure ball 5, which will lift the pressure ball 5, so that the pressure ball 5 and the sealing gasket 9 form a certain gap, forming a channel, and the liquid enters the cavity from the gap; then the liquid spiral passes through the thread groove of the lower section of the screw core shaft 6, reaches the pressure regulating port 31, and then enters the feed channel 3; wherein, the size of the inlet of the feed channel 3 (i.e., the pressure regulating port 31) determines the current pressure of the liquid, and the pressure gauge 8 can clearly display the value of the current pressure of the back pressure valve, and when the pressure reaches the predetermined value, the regulation stops; the rubber material is discharged from the discharge port 32 at this constant pressure, ensuring the stability of the flow rate.

[0050] The above disclosure is only a preferred embodiment of the present invention, which cannot be used to limit the scope of rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of rights covered by the present invention.

Claims

1. A pipeline back pressure valve for stable liquid metering and delivery, characterized in that: include: A base and a pedestal tightly connected to each other; a connected cavity is formed inside the base and the pedestal, the base is provided with a discharge channel laterally connected to the cavity, one end of the discharge channel connected to the cavity is a pressure regulating port, and the other end is a discharge port of the back pressure valve; the pedestal is provided with a feed channel connected to the cavity, and the outer end of the feed channel is a feed port of the back pressure valve; A pressure ball is arranged in the cavity, located above the feed channel, and blocks the feed channel by its own gravity; A screw core shaft, the main body of which is disposed in the cavity; the screw core shaft can reciprocate to adjust the area of the pressure regulating port blocked by the side wall of the screw core shaft; The back pressure valve further comprises: A sealing gasket is arranged between the feed channel and the pressure ball; the upper surface of the sealing gasket is in contact with the bottom surface of the pressure ball, the outer peripheral side of the sealing gasket is in close contact with the inner wall of the cavity, and a vertically penetrating hole is provided in the middle of the sealing gasket; the hole is connected to the feed channel downwards and contacts the bottom surface of the pressure ball upwards; the surface of the sealing gasket in contact with the bottom surface of the pressure ball is conical; The screw core shaft comprises an upper section, a middle section and a lower section; the middle section of the screw core shaft can block the pressure regulating port; the end of the screw core shaft close to the pressure ball is its lower section, and the lower section is provided with a first external thread; the top of the first external thread can fit with the middle and lower inner wall of the cavity, and the tooth groove of the first external thread is used for passing liquid; the middle and lower part of the cavity is located below the pressure regulating port and above the pressure ball.

2. The pipeline back pressure valve for stable liquid metering and delivery according to claim 1, characterized in that: The back pressure valve further comprises: An adjusting flange cover connected to the base; The top end of the screw core shaft passes through the base and extends into the inner cavity of the adjusting flange cover.

3. The pipeline back pressure valve for stable liquid metering and delivery according to claim 1, characterized in that: The back pressure valve further comprises: A pressure gauge is connected to the feed channel.

4. The pipeline back pressure valve for stable liquid metering and delivery according to claim 1, characterized in that: The upper section of the screw core shaft is provided with a second external thread with a smaller diameter than the middle section; a constriction is provided on the upper part of the base, and an internal thread is provided on the inner wall of the constriction; the second external thread is adapted to be connected with the internal thread; when the screw core shaft moves upward until the upper annular surface of the middle section presses against the bottom end of the constriction, the movement stops and the pressure regulating port is opened to the maximum.

5. The pipeline back pressure valve for stable liquid metering and delivery according to claim 1, characterized in that: The diameter of the lower section of the screw core shaft is smaller than the diameter of the middle section; the lower annular surface of the middle section of the screw core shaft can move downward to below the pressure regulating port, and finally abut against the upper end surface of the middle and lower part of the cavity to completely block the liquid in the middle and lower part of the cavity from entering the discharge channel.

6. The pipeline back pressure valve for stable liquid metering and delivery according to claim 1, characterized in that: A scraper is embedded on the inner wall of the cavity, the scraper is located above the pressure regulating port, and the scraper is annularly arranged and closely fits the screw core shaft.

7. The pipeline back pressure valve for stable liquid metering and delivery according to claim 6, characterized in that: The bottom surface of the scraper is a slope with a high outer circumference and a low inner ring.

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