Vacuum drainage pressure stabilizing valve

Abstract

This invention discloses a vacuum drainage pressure stabilizing valve, comprising a valve body with an inner cavity and a triggering mechanism. The valve body has a normal pressure port at the bottom for ventilation, a negative pressure port at the waist, and an internally threaded through hole at the top. The triggering mechanism includes a sealing body assembly, a compression spring, a top plate, and a top rod. The sealing body assembly is disposed within the inner cavity, dividing the inner cavity into a normal pressure chamber and a negative pressure chamber. The normal pressure chamber is connected to the normal pressure port, and the negative pressure chamber is connected to the negative pressure port. A pressure gauge is connected in parallel to the negative pressure port and communicates with the negative pressure chamber. When the negative pressure port of this invention is connected in parallel to a vacuum drainage pipe, the vacuum drainage pressure stabilizing valve is closed when the vacuum level at the connection point in the vacuum drainage pipe is higher than the set opening pressure; and opens when the vacuum level at the connection point is lower than the set opening pressure. This invention features a purely mechanical structure, requires no electricity, is maintenance-free, has a long service life, is highly applicable, and has a simple and reliable structure.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and more specifically to a vacuum drainage pressure stabilizing valve for use in vacuum drainage system pipelines. Background Technology

[0002] As is well known, in vacuum drainage systems, not only do valves, elbows, and reducers in the pipes cause a loss of vacuum, but also the length of a straight pipe is directly proportional to the vacuum loss due to the resistance of the pipe wall. For a 160mm diameter vacuum pipe, the vacuum loss is approximately 19Pa per meter. This means that when the vacuum level at the vacuum pump station is -70kPa, neglecting pipe fitting losses, a 2km long 160mm diameter vacuum pipe will have a vacuum of approximately -32kPa at the end, allowing for the pumping of a water column up to 3.2 meters high. Currently, vacuum drainage technology is widely used in decentralized sewage collection in rural areas and scenic spots. Its characteristics include a wide area, dispersed collection points, and the use of Z-shaped pipe arrangements. Inevitably, a plug-like water column appears within the pipe, affecting the end vacuum level and further reducing the suction head, resulting in the inability to pump sewage from the end vacuum lifter. Traditional solutions either involve adding a manual ball valve for venting or setting up a cable-powered system with a pressure sensor and solenoid valve for automatic venting to clear blockages and prevent the formation of a plunger-shaped water column in the pipe that would lose vacuum. Both of these solutions significantly increase the investment cost of the vacuum drainage system. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a purely mechanical vacuum drainage pressure stabilizing valve that requires no electricity, is maintenance-free, has a long service life, is highly applicable, simple and reliable, thus overcoming the deficiencies of existing technologies.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a vacuum drainage pressure stabilizing valve, comprising a valve body having an inner cavity and a triggering mechanism, wherein the bottom of the valve body is provided with an atmospheric pressure port, the waist is provided with a negative pressure port, and the top is provided with an internally threaded through hole; the triggering mechanism comprises a sealing body assembly, a compression spring, a top plate and a top rod, the sealing body assembly being disposed in the inner cavity, dividing the inner cavity into an atmospheric pressure chamber and a negative pressure chamber, the atmospheric pressure chamber being connected to the atmospheric pressure port, and the negative pressure chamber being connected to the negative pressure port.

[0005] Furthermore, the compression spring is disposed in the negative pressure chamber, with its two ends connected to the lower side of the top plate and the upper side of the sealing body assembly, respectively. The upper side of the top plate abuts against the bottom of the push rod, and the push rod is fixed to the internal threaded through hole of the valve body by a threaded connection.

[0006] Furthermore, the top of the negative pressure chamber is provided with multiple vertical guide grooves in the circumferential direction. The top plate moves up and down along the guide grooves under the action of the compression spring and the top rod to adjust the compression distance of the compression spring.

[0007] Furthermore, the sealing body assembly includes, from top to bottom, a pressure block, a rubber pad, and a support plate, and is fixed by bolts.

[0008] Furthermore, the adhesive pad is made of rubber or silicone.

[0009] Furthermore, the negative pressure chamber is provided with an annular protrusion, and the normal pressure chamber is provided with multiple protrusions in the circumferential direction. The sealing body assembly moves up and down under the action of negative pressure and compression spring so that the negative pressure chamber is connected to or separated from the normal pressure port.

[0010] Furthermore, the valve body includes a valve cover and a valve seat. The valve cover is connected to the valve seat by adhesive, thread, or snap fastener. The valve cover is a flared tee, and the valve seat is a hollow flared shape. The negative pressure port and the internal threaded through hole are provided on the valve cover, and the normal pressure port is provided on the valve seat.

[0011] Furthermore, a pressure gauge is connected in parallel to the negative pressure port and communicates with the negative pressure chamber.

[0012] Furthermore, the diameter of the vacuum drain pressure stabilizing valve is much smaller than the diameter of the vacuum drain pipe, and the negative pressure port is connected in parallel with the vacuum drain pipe.

[0013] Furthermore, the vacuum level set for the vacuum drain pressure regulating valve is less than the maximum vacuum level within the vacuum drain pipe connection point.

[0014] Beneficial effects: This invention utilizes the upward pressure generated by the pressure difference between the upper and lower surfaces of the sealing assembly to counteract the downward elastic force of the compression spring on the sealing assembly. The magnitude of the elastic force of the compression spring on the sealing assembly can be adjusted by rotating the top rod. When the vacuum level at the connection point of this invention is lower than the set value, the upward pressure generated by the pressure difference on the sealing assembly is lower than the elastic force. Under the action of the elastic force, the sealing assembly moves downward, and the support plate abuts against the protrusion of the atmospheric pressure chamber. This invention is in the open state, connecting the outside atmosphere with the vacuum drainage pipe. Under atmospheric pressure, outside air enters the vacuum drainage pipe and pushes the plunger-shaped water column in the vacuum drainage pipe between the connection point and the vacuum sewage tank to the vacuum sewage tank, thereby clearing the section of the vacuum drainage pipe and increasing the vacuum level inside the pipe. When the vacuum level at the connection point of this invention is higher than the set value, the upward pressure generated by the pressure difference on the sealing assembly is greater than the elastic force. Under the action of pressure, the sealing assembly moves upward, and the rubber gasket presses against the annular protrusion of the negative pressure chamber to form a sealing surface. This invention is in the closed state, thereby preventing outside air from entering the vacuum drainage pipe. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional view of the present invention in the closed state.

[0018] Figure 3 This is a cross-sectional view of the present invention in the open state.

[0019] Figure 4 This is a three-dimensional enlarged structural diagram of the valve cover.

[0020] Figure 5 This is a three-dimensional enlarged structural diagram of the valve seat. Implementation

[0021] See Figures 1-5 A vacuum drainage pressure regulating valve includes a valve body with an inner cavity and a triggering mechanism. The valve body has a normal pressure port 202 at the bottom for ventilation, a negative pressure port 302 at the waist, and an internally threaded through hole 303 at the top. The triggering mechanism includes a sealing body assembly, a compression spring 7, a top plate 6, and a push rod 4. The sealing body assembly is disposed within the inner cavity, dividing the inner cavity into a normal pressure chamber 204 and a negative pressure chamber 304. The normal pressure chamber communicates with the normal pressure port 202, and the negative pressure chamber communicates with the negative pressure port 302. The compression spring 7... It is set in the negative pressure chamber 304, and its two ends are respectively connected to the lower side of the top plate 6 and the upper side of the sealing body assembly. The upper side of the top plate abuts against the bottom of the push rod 4. The push rod is fixed to the internal threaded through hole 303 of the valve body by threaded connection. The valve body includes a valve cover 301 and a valve seat 201. The valve cover is connected to the valve seat by adhesive, thread or snap. The valve cover is a flared tee. The valve seat is a hollow flared shape. The negative pressure port 302 and the internal threaded through hole 303 are set on the valve cover. The normal pressure port 202 is set on the valve seat.

[0022] The sealing assembly includes, from top to bottom, a pressure block 8, a rubber pad 9, and a support plate 10, which are fixed by bolts. The rubber pad is made of rubber or silicone. The negative pressure chamber 304 is also provided with an annular boss 306. The normal pressure chamber 204 is provided with multiple protrusions 203 in the circumferential direction. The negative pressure port 302 is connected in parallel with the vacuum drain pipe 1. The sealing assembly moves up and down under the action of negative pressure and compression spring 7 so that the negative pressure chamber 304 is connected to or disconnected from the normal pressure port 202.

[0023] The top of the negative pressure chamber 304 has multiple vertical guide grooves 307 arranged in the circumferential direction. By rotating the top rod 4, the top plate 6 can move up and down along the guide grooves under the action of the compression spring 7 and the top rod, so as to adjust the compression distance of the compression spring. When rotating the top rod 4, the opening pressure of the present invention can be set by observing the pointer reading of the pressure gauge 5 connected in parallel to the negative pressure port 302 and communicating with the negative pressure chamber 304, as well as the air intake action of the normal pressure port 202. In use, the opening pressure set is different depending on the location of the installation in the vacuum drain pipe, and should be set according to the actual situation.

[0024] The opening and closing principle of this application is as follows: (e.g.) Figure 1 As shown, in this application, the negative pressure port 302 of the present invention is connected in parallel with the vacuum drainage pipe 1, and the normal pressure port 202 is connected to a normal pressure source, which can be the atmosphere. When the vacuum degree at the connection point in the vacuum drainage pipe 1 is higher than the set opening pressure, the upward pressure generated by the pressure difference between the upper and lower surfaces of the sealing body assembly is greater than the downward elastic force of the compression spring 7 on the sealing body assembly, the compression length of the compression spring increases, the sealing body assembly connects with the valve cover 301, the rubber gasket 9 presses on the boss 306 to form a sealing surface, the negative pressure chamber 304 is isolated from the atmosphere, and the vacuum drainage pressure stabilizing valve is in the closed state; when a plunger-shaped water column appears at the front end of the vacuum drainage pipe 1, and the vacuum degree in the pipe at the connection point of the vacuum drainage pressure stabilizing valve is lower than the set opening pressure, the upward pressure generated by the pressure difference between the upper and lower surfaces of the sealing body assembly is less than the downward elastic force of the compression spring 7 on the sealing body assembly, the compression length of the compression spring decreases, the sealing body assembly connects with the valve seat 201, and the support plate 10 abuts against the protrusion 203. The negative pressure chamber 304 is connected to the atmosphere, and the vacuum drainage pressure stabilizing valve is in the open state. Under the action of atmospheric pressure, outside air enters the vacuum drainage pipe sequentially through the normal pressure port 202, the normal pressure chamber 204, the negative pressure chamber 304, and the negative pressure port 302, reducing the vacuum degree in the pipe at the connection point. This increases the pressure difference between the two ends of the plunger-shaped water column in the vacuum drainage pipe between the connection point and the vacuum sewage tank. The plunger-shaped water column is pushed to the vacuum sewage tank by the pressure, thereby clearing the section of the vacuum drainage pipe. Since the diameter of the vacuum sewage pipe is much larger than the diameter of the vacuum drainage pressure stabilizing valve, after the vacuum drainage pipe is cleared, the amount of outside air entering is much smaller than the amount of air discharged from the vacuum pump station. The vacuum degree in the vacuum sewage pipe gradually increases and returns to the initial vacuum degree. When it increases to the set opening pressure, the vacuum drainage pressure stabilizing valve closes.

Claims

1. A vacuum drain pressure regulating valve, comprising a valve body having an internal cavity and a triggering mechanism, characterized in that: The valve body has a normal pressure port (202) at the bottom for ventilation, a negative pressure port (302) at the waist, and an internal threaded through hole (303) at the top. The triggering mechanism includes a sealing body assembly, a compression spring (7), a top plate (6), and a push rod (4). The sealing body assembly is located in the inner cavity, dividing the inner cavity into a normal pressure chamber (204) and a negative pressure chamber (304). The normal pressure chamber is connected to the normal pressure port (202), and the negative pressure chamber is connected to the negative pressure port (302). The compression spring (7) is located in the negative pressure chamber (304), with its two ends connected to the lower side of the top plate (6) and the upper side of the sealing body assembly, respectively. The upper side abuts against the bottom of the top rod (4), and the top rod is fixed to the internal threaded through hole (303) of the valve body by a threaded connection; the top of the negative pressure chamber (304) is provided with multiple vertical guide grooves (307) in the circumferential direction; the top plate (6) moves up and down along the guide groove under the action of the compression spring (7) and the top rod (4) to adjust the compression distance of the compression spring; the negative pressure chamber (304) is provided with an annular boss (306); the normal pressure chamber (204) is provided with multiple protrusions (203) in the circumferential direction; the sealing body assembly moves up and down under the action of negative pressure and compression spring (7) to make the negative pressure chamber connected to or disconnected from the normal pressure port (202).

2. The vacuum drain pressure stabilizing valve according to claim 1, characterized in that: The sealing body assembly includes, from top to bottom, a pressure block (8), a rubber pad (9), and a support plate (10), and is fixed by bolts.

3. The vacuum drain pressure regulating valve according to claim 2, characterized in that: The adhesive pad (9) is made of rubber or silicone.

4. The vacuum drain pressure regulating valve according to claim 1, characterized in that: The valve body includes a valve cover (301) and a valve seat (201). The valve cover is connected to the valve seat by adhesive, thread or snap. The valve cover is a horn-shaped tee. The valve seat is a hollow horn shape. The negative pressure port (302) and the internal threaded through hole (303) are provided on the valve cover. The normal pressure port (202) is provided on the valve seat.

5. The vacuum drain pressure stabilizing valve according to claim 1, characterized in that: The negative pressure port (302) is equipped with a pressure gauge (5) connected in parallel to the negative pressure chamber (304).

6. The vacuum drain pressure regulating valve according to claim 5, characterized in that: Its diameter Much smaller than the diameter of the vacuum drain pipe (1), the negative pressure port (302) is connected in parallel with the vacuum drain pipe.

7. The vacuum drain pressure stabilizing valve according to claim 6, characterized in that: The set opening vacuum degree is less than the maximum vacuum degree in the vacuum drainage pipe (1) connection point.

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