CN215763304U - Valve with spring-free cascade valve core - Google Patents
Valve with spring-free cascade valve core Download PDFInfo
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- CN215763304U CN215763304U CN202121770899.7U CN202121770899U CN215763304U CN 215763304 U CN215763304 U CN 215763304U CN 202121770899 U CN202121770899 U CN 202121770899U CN 215763304 U CN215763304 U CN 215763304U
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Abstract
The utility model relates to a valve with a spring-free cascade type valve core, which comprises a valve body, a valve core, a valve seat, a valve core rod, a sealing ring, a valve cover, a valve core gland and an actuating mechanism. The valve seat is welded with the valve body, the valve cover is in self-tightening sealing connection with the valve body under pressure, an auxiliary valve core sealing surface is arranged at the end part of a valve core rod, the valve core consists of three parts, the lower part of the valve core is a throttling sleeve, the outer diameter of the throttling sleeve is d1, throttling holes are arranged on the circumference of the throttling sleeve, the middle part of the throttling sleeve is a cylinder 1, the outer diameter of the throttling sleeve is d3, the lower end of the throttling sleeve is provided with a valve core sealing surface, the auxiliary valve seat sealing surface is arranged in the valve core, the upper part of the throttling sleeve is a cylinder 2, the outer diameter of the throttling sleeve is d2, the outer diameter of the valve core d3 is larger than d1, d1 is larger than d2, a cylinder hole 2 is arranged in the valve cover, and the cylinder 2 is arranged in the valve core sealing surface. After the valve is opened, the medium force always pushes the valve core away from the valve core rod, so that the upper cavity and the lower cavity of the valve core are communicated, and the valve core becomes a balanced type valve core. The valve core of the utility model can keep the function of balancing the valve core without a spring, thereby effectively avoiding the vibration and the noise of the valve and having small operating force when the valve is closed.
Description
Technical Field
The utility model relates to a valve with a spring-free cascade valve core, and belongs to valves used in the fields of thermal power, nuclear power, petrochemical industry and the like.
Background
When the valve used in the fields of thermal power, nuclear power, petrochemical industry and the like is under a high pressure difference working condition, the opening or closing operating force of the valve is large, and similar conditions also exist in the large-caliber valve. In order to reduce the operating force of the valve, a balanced valve core or a cascade valve core with a spring is generally adopted, but the balanced valve core has a sealing grade difference when closed, and the leakage amount is large. The valve structure of the cascade valve core with the spring is complex, in order to prevent the valve from closing, the auxiliary valve core is closed firstly, the spring is arranged between the auxiliary valve core and the valve core, but when the spring force is not properly set, the valve can generate vibration noise. If the spring force is too small, the auxiliary valve core and the valve core are closed first, the balance function of the valve core is invalid, or vibration noise is generated; if the spring force is too large, it is limited in space, difficult to install, and increases the operating force when the valve is closed.
When the valve with the cascade valve core with the spring is closed, the operating force of the actuating mechanism is equal to the sum of the valve rod packing friction force, the spring force, the auxiliary valve core sealing force and the medium force. Therefore, the valve operating force is large.
Aiming at the problems, the utility model discloses a valve with a spring-free cascade type valve core. When the valve is closed and sealed, the spring force does not need to be overcome.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problems that the design of the spring of the cascade valve core with the spring is difficult, and the valve is easy to generate vibration and noise. The utility model discloses a valve with a spring-free cascade valve core.
The utility model comprises the following contents:
a valve with a spring-free cascade type valve core comprises a valve body, a valve core, a valve seat, a valve core rod, a sealing ring, a valve cover, a valve core gland and an actuating mechanism. The valve seat is welded with the valve body, and the valve cover is in self-tightening sealing connection with the valve body.
The valve core rod is an integrated structure of an auxiliary valve core and a valve rod, an auxiliary valve core sealing surface is arranged at the end part of the valve core rod, and a through hole is formed in the cylinder d 4.
The valve core consists of three parts, the lower part of the valve core is a throttling sleeve, the outer diameter of the throttling sleeve is d1, and a plurality of throttling holes are formed in the circumference of the throttling sleeve; the middle part is a cylinder 1, the outer diameter of the cylinder is d3, the outer part of the lower end of the cylinder is provided with a valve core sealing surface, and the inner part of the cylinder is provided with an auxiliary valve seat sealing surface; the upper portion is cylinder 2, and its external diameter is D2, and its upper end excircle sets up 1 to 3 recesses, places the sealing washer in the recess, and perhaps its upper end excircle sets up 3 and above seal groove, and its inside sets up cylinder hole 1, and its internal diameter value is D1. The outer diameter d3 of the valve core is larger than d1, and d1 is larger than d 2. In order to achieve the best valve core balancing effect, the outer diameter d1 of the lower throttling sleeve of the valve core is larger than or equal to d2+2mm and smaller than or equal to d2+15 mm.
The cylinder d4 of the valve core rod is arranged in the cylindrical hole 1 of the valve core, is guided and can move up and down.
The upper end of the cylindrical hole 1 of the valve core is provided with threads, and the valve core gland is screwed into the threads to connect the valve core rod and the valve core together. When the valve is closed, the sealing surface of the valve core is matched and sealed with the valve seat, the sealing surface of the auxiliary valve core at the end part of the valve core rod is matched and sealed with the sealing surface of the auxiliary valve seat, and the valve core becomes an unbalanced valve core.
The lower end of the valve cover is provided with a cylindrical hole 2, the inner diameter value of the cylindrical hole is D2, D2 is more than or equal to D2+0.1mm, and is less than or equal to D2+1 mm. The cylinder 2 on the upper part of the valve core is arranged in the cylindrical hole 2 at the lower end of the valve cover, and is sealed by a sealing ring in a groove at the upper end of the valve core, or is subjected to medium pressure reduction sealing by a sealing groove at the upper end of the valve core.
The throttling sleeve at the lower part of the valve core is arranged in the inner hole D3 of the valve seat and can move up and down. When the valve is opened and closed, the valve core rod drives the valve core to reciprocate in the cylindrical hole 2 of the valve cover and the inner hole D3 of the valve seat.
When the valve is closed, the medium pressure at the upper part of the valve core is P1, the medium pressure at the lower part of the valve core is 0, and the medium force F1 is pi/4 d12P1, F1 pressed the valve element against the valve seat. When the valve is opened, the actuating mechanism drives the valve core rod to move upwards, the auxiliary valve core is opened firstly, the valve core is not moved, the upper cavity and the lower cavity of the valve core are communicated, the pressure balance is P2, and the valve core becomes a balanced valve core. The force of the medium pushing the valve core to the valve seat is F2 pi/4 x (d 1)2-d22) (P1-P2); in the opening process, when the valve core rod is contacted with the valve core gland, the valve core rod drives the valve core to move upwards for opening. When the valve is closed, the actuating mechanism drives the valve core rod to move downwards, the medium force F2 pushes the valve core away from the valve core rod all the time in the process, the auxiliary valve core is closed again after the valve core is closed, and the valve core is changed from balanced type to unbalanced type. Therefore, in the process of opening and closing the valve, under the action of the medium force F2, the auxiliary valve core is always in an open state, and the pressure balance function of the upper cavity and the lower cavity of the valve core is kept.
The utility model has the beneficial effects that:
1. the valve with the spring-free cascade type valve core has a simple structure, a spring does not need to be configured in the valve core, the valve core can keep the function of balancing the valve core when the valve operates, and vibration and noise in the operation process of the valve are effectively avoided;
2. according to the valve with the spring-free cascade valve core, when the valve is closed and sealed, the spring force does not need to be overcome, and the operating force of the valve is small.
Drawings
FIG. 1 is a cross-sectional view of a valve having a spring-less cascade spool;
FIG. 2 is a schematic structural view of the valve cartridge;
FIG. 3 is a schematic view of the construction of the valve core rod;
FIG. 4 is a schematic structural view of a valve cover;
FIG. 5 is a schematic view of the valve seat structure;
FIG. 6 is a force diagram of the valve closed condition;
fig. 7 is a force diagram illustrating the open state of the valve.
In the figure, 1-valve body, 2-valve core, 3-valve seat, 4-sealing ring, 5-valve cover, 6-valve core rod, 7-actuating mechanism and 8-valve core gland
Detailed Description
In order that the objects, aspects and advantages of the utility model will become more apparent, the utility model will be described by way of example only, which is illustrated in the accompanying drawings. It should be understood that the description is intended to be exemplary, and not intended to limit the scope of the utility model. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The utility model is implemented as follows: the utility model provides a valve with a spring-free cascade type valve core, which comprises a valve body 1, a valve core 2, a valve seat 3, a sealing ring 4, a valve cover 5, a valve core rod 6, an actuating mechanism 7 and a valve core gland 8. The valve seat 3 is welded with the valve body 1, and the valve cover 5 is in self-tightening sealing connection with the valve body 1.
The valve core rod 6 is an integrated structure of an auxiliary valve core and a valve rod, an auxiliary valve core sealing surface is arranged at the end part of the valve core rod 6, and a through hole is arranged on a cylinder d4 of the valve core rod 6.
The valve core 2 consists of three parts. The lower part of the valve core 2 is a throttling sleeve, the outer diameter of the throttling sleeve is d1, and a plurality of throttling holes are arranged on the circumference of the throttling sleeve; the middle part of the valve core 2 is a cylinder 1, the outer diameter of the cylinder is d3, the outer part of the lower end of the cylinder is provided with a valve core sealing surface, and the inner part of the cylinder is provided with an auxiliary valve seat sealing surface; the upper portion of case 2 is cylinder 2, and its external diameter is D2, and its upper end excircle sets up 1 to 3 recesses, places sealing washer 4 in the recess, perhaps its upper end excircle sets up 3 and above seal groove, and inside sets up cylindrical hole 1, and the internal diameter is D1. The outer diameter d3 of the valve core 2 is larger than d1, and d1 is larger than d 2. In order to further ensure the complete pressure balance function of the valve core 2, the outer diameter d1 of the lower throttling sleeve of the valve core 2 is larger than or equal to d2+2mm and smaller than or equal to d2+15 mm.
The cylinder d4 of the valve core rod 6 is arranged in the cylindrical hole 1 of the valve core 2 and guided by the cylindrical hole 1, and the valve core rod 6 can move up and down.
The upper end of the cylindrical hole 1 of the valve core 2 is provided with threads, the valve core rod 6 is firstly arranged in the cylindrical hole 1 at the upper part of the valve core 2, then the valve core gland 8 is screwed into the screw hole of the cylindrical hole 1, and the valve core rod 6 and the valve core 2 are connected together by the valve core gland 8. When the valve is closed, the sealing surface of the valve core 2 is matched with the sealing surface of the valve seat 3, the sealing surface of the auxiliary valve core at the end part of the valve core rod 6 is matched with the sealing surface of the auxiliary valve seat on the valve core 2, and the valve core 2 is of a non-balanced structure, so that the sealing performance of the valve is ensured.
The lower end of the valve cover 5 is provided with a cylindrical hole 2, and the diameter D2 of the cylindrical hole is more than or equal to D2+0.1mm and less than or equal to D2+1 mm. The cylinder 2 at the upper part of the valve core 2 is arranged in the cylindrical hole 2 at the lower end of the valve cover 5, and is sealed by using a sealing ring 4 in a groove at the upper end of the valve core 2, or is subjected to medium pressure reduction sealing by using a sealing groove at the upper end of the valve core 2. The lower end of the valve core 2 is sleeved in an inner hole D3 of the valve seat 3 in a throttling manner. When the valve is opened and closed, the valve core rod 6 drives the valve core 2 to reciprocate in the cylindrical hole 2 of the valve cover 5 and the inner hole D3 of the valve seat 3.
When the valve is closed, the upper medium pressure of the valve core 2 is P1, the lower medium pressure of the valve core 2 is 0, and the medium force F1 is pi/4 d12P1, F1 presses the valve element 2 against the valve seat 3.
When the valve is opened, the actuating mechanism 7 drives the valve core rod 6 to move upwards, the auxiliary valve core is opened firstly, the valve core 2 is not moved, the upper cavity and the lower cavity of the valve core 2 are communicated, the pressure balance is P2, and the valve core 2 becomes a balanced valve core. The force with which the medium pushes the valve element 2 against the valve seat 3 is F2 pi/4 x (d 1)2-d22) (P1-P2); when the valve core rod 6 is contacted with the valve core gland 8, the valve core rod 6 drives the valve core 2 to move upwards, and the valve is opened; in the valve opening process, the medium force F2 always makes the spool rod 6 contact with the spool gland 8, i.e. the auxiliary spool is in the open state. In the closing process of the valve, the medium force F2 always pushes the valve core 2 to the valve seat 3 and away from the valve core rod 6, so that the valve core 2 moves along with the valve core rod 6, namely the auxiliary valve core is in an open state; when the valve core 2 and the valve seat 3 are closed, the auxiliary valve core is closed again. Therefore, in the process of opening and closing the valve, under the action of the medium force F2, the auxiliary valve core is always in an open state, and the balance function of the valve core 2 is maintained, that is, the valve core 2 is always a balanced valve core.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (3)
1. The utility model provides a valve with no spring cascade case, includes valve body (1), case (2), disk seat (3), sealing washer (4), valve gap (5), case pole (6), case gland (8) and actuating mechanism (7), its characterized in that: the valve core rod (6) is an integrated structure of an auxiliary valve core and a valve rod, and the end part of the valve core rod is provided with an auxiliary valve core sealing surface; the valve core (2) is composed of three parts, the lower part is a throttling sleeve, the outer diameter of the throttling sleeve is d1, a plurality of throttling holes are arranged on the circumference of the throttling sleeve, the middle part is a cylinder 1, the outer diameter of the throttling sleeve is d3, the outer part of the lower end of the throttling sleeve is provided with a valve core sealing surface, the inner part of the throttling sleeve is provided with an auxiliary valve seat sealing surface, the upper part of the throttling sleeve is a cylinder 2, the outer diameter of the throttling sleeve is d2, the outer circle of the upper end of the throttling sleeve is provided with 1-3 grooves, sealing rings (4) are placed in the grooves, or the outer circle of the upper end of the throttling sleeve is provided with 3 or more sealing grooves, the outer diameter d3 of the valve core is larger than d1, and d1 is larger than d 2.
2. A valve having a spring-less cascaded valve spool according to claim 1, wherein: the outer diameter d1 of the lower throttle sleeve of the valve core (2) is more than or equal to d2+2mm and less than or equal to d2+15 mm.
3. A valve having a spring-less cascaded valve spool according to claim 1, wherein: the lower end of the valve cover (5) is provided with a cylindrical hole 2, the outer diameter of the cylindrical hole is D2, D2 is larger than or equal to D2+0.1mm and smaller than or equal to D2+1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770899.7U CN215763304U (en) | 2021-07-23 | 2021-07-23 | Valve with spring-free cascade valve core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121770899.7U CN215763304U (en) | 2021-07-23 | 2021-07-23 | Valve with spring-free cascade valve core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215763304U true CN215763304U (en) | 2022-02-08 |
Family
ID=80109166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121770899.7U Active CN215763304U (en) | 2021-07-23 | 2021-07-23 | Valve with spring-free cascade valve core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215763304U (en) |
-
2021
- 2021-07-23 CN CN202121770899.7U patent/CN215763304U/en active Active
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