CN214404705U - Self-balancing proportional flow valve - Google Patents
Self-balancing proportional flow valve Download PDFInfo
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- CN214404705U CN214404705U CN202120188619.5U CN202120188619U CN214404705U CN 214404705 U CN214404705 U CN 214404705U CN 202120188619 U CN202120188619 U CN 202120188619U CN 214404705 U CN214404705 U CN 214404705U
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Abstract
The utility model belongs to the technical field of the flow valve technique and specifically relates to a proportional flow valve of self-balancing includes: a valve body having a valve cavity, a port P1 and a port P2; the sleeve is fixedly arranged in the valve cavity; the valve rod is slidably arranged in the sleeve, an inner concave part with an inner concave peripheral surface is arranged at the bottom end of the valve rod, a first cavity is formed between the inner concave part of the valve rod and the inner peripheral surface of the sleeve, a P1 port is communicated with the first cavity, the sleeve and the valve rod in the sleeve divide the valve cavity into a second cavity positioned below and a third cavity positioned above, the second cavity and the third cavity are communicated through a flow passage, and a P2 port is communicated with the second cavity; a valve core; and the actuating mechanism divides the valve cavity into a first cavity, a second cavity and a third cavity by utilizing the valve rod and the sleeve, so that the force of the fluid medium acting on the valve rod to generate displacement is close to balance, the interference of the fluid medium on the opening of the valve core in a closed or opened state is reduced or avoided, the opening of the valve core is completely controlled by the actuating mechanism, and the flow control precision is stable.
Description
Technical Field
The utility model belongs to the technical field of the flow valve technique and specifically relates to a proportion flow valve of self-balancing.
Background
The electric proportional flow valve is used as a highly integrated electromechanical integrated product, is the core of an electric proportional control technology, represents the development direction of a fluid control technology, and is widely applied to factory automation and vehicle control.
The existing electric proportional flow valve is divided into a direct-acting electric proportional flow valve and a pilot-operated electric proportional flow valve, however, in the using process of the direct-acting electric proportional flow valve and the pilot-operated electric proportional flow valve, the problems that the control precision is poor and leakage is easy to occur due to the fact that fluid media can cause large impact on a valve core or a valve rod exist.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the problems that the control precision is poor and leakage is easy to occur due to the fact that fluid media in the proportional flow valve in the prior art can cause large impact on a valve core or a valve rod, a self-balancing proportional flow valve is provided.
The utility model provides a technical scheme that its technical problem adopted is: a self-balancing proportional flow valve comprising:
a valve body having a valve cavity, a port P1 and a port P2;
the sleeve is fixedly arranged in the valve cavity;
the valve rod is slidably arranged in the sleeve, an inner concave part with an inner concave peripheral surface is arranged at the bottom end of the valve rod, an upper stress surface is formed between the upper end of the inner concave part and the outer peripheral surface of the valve rod, a first cavity is formed between the inner concave part of the valve rod and the inner peripheral surface of the sleeve, a P1 port is communicated with the first cavity, the sleeve and the valve rod in the sleeve divide the valve cavity into a second cavity positioned below and a third cavity positioned above, the second cavity is communicated with the third cavity through a flow channel, and a P2 port is communicated with the second cavity;
the valve core is arranged at the bottom end of the valve rod, and a lower stress surface is formed between the top end of the peripheral surface of the valve core and the peripheral surface of the valve rod;
the actuating mechanism is used for driving the valve rod and the valve core on the valve rod to move close to or away from the bottom end opening of the sleeve, and when the valve core is close to the lower stress surface to abut against the end part of the bottom end of the sleeve and the bottom end opening of the sleeve is blocked, the first cavity is isolated from the second cavity; when the valve core is far away from the end part of the bottom end of the sleeve, the first cavity is communicated with the second cavity.
In the scheme, the valve cavity is divided into a first cavity, a second cavity and a third cavity by the valve rod and the sleeve, the second cavity is communicated with the third cavity, and when the flow valve is in a closed state, a fluid medium in the first cavity respectively generates opposite acting forces on an upper stressed surface and a lower stressed surface, so that the force of the fluid medium acting on the valve rod to generate displacement is close to balance, and self balance of the flow valve in the closed state is formed; when the flow valve is opened, the fluid media in the second cavity and the third cavity respectively generate opposite acting forces on two ends of the valve rod, so that the fluid media act on the valve rod to enable the forces generated by the displacement of the fluid media to approach to balance, and self balance of the flow valve in an opened state is formed; therefore, the interference of the fluid medium to the opening degree of the valve core in a closed or opened state is reduced or avoided, the opening degree of the valve core is completely controlled by the actuating mechanism, and the flow control precision is stable.
Further, the runner is arranged inside the valve rod, the bottom end opening of the runner is communicated with the second cavity, and the top end opening of the runner is communicated with the third cavity.
Further, when the valve core blocks the bottom end opening of the sleeve, the fluid medium in the first cavity generates an upward thrust F1 to the upper force bearing surface, and the fluid medium in the first cavity generates a downward thrust F2 to the lower force bearing surface, where F1 is F2; this makes it possible to achieve complete self-balancing in the closed state of the flow valve.
Further, when the valve core is far away from the end part of the bottom end of the sleeve, and the first cavity is communicated with the second cavity, the fluid medium in the first cavity generates an upward thrust F3 on the upper force bearing surface, the fluid medium in the first cavity generates a downward thrust F4 on the lower force bearing surface, the fluid medium in the second cavity generates an upward thrust F5 on the bottom end of the valve core and the bottom end of the valve rod, and the fluid medium in the third cavity generates a downward thrust F6 on the top end of the valve core, wherein F3+ F5 is F4+ F6; this makes it possible to achieve complete self-balancing in the open state of the flow valve.
Furthermore, the actuating mechanism is a proportional electromagnet, a push rod of the proportional electromagnet is fixed on the valve rod, an elastic element is arranged between the valve rod and the sleeve, one end of the elastic element props against the valve core, the other end of the elastic element props against the sleeve, the proportional electromagnet is fixed at the upper end of the valve body, and a third cavity is formed among the proportional electromagnet, the valve rod and the sleeve; through directly linking to each other the push rod of proportion electromagnet with the valve rod, realize the direct-action type control, corresponding fast.
Further, an air inlet cavity is arranged between the outer circumferential surface of the sleeve and the inner circumferential surface of the valve cavity, the air inlet cavity is communicated with the P1 port, a communication hole is formed in the sleeve, and the air inlet cavity is communicated with the first cavity through the communication hole; by means of the arrangement of the air inlet cavity, air introduced from the P1 port enters the air inlet cavity and then enters the first cavity from the communicating hole, and a certain flow stabilizing effect is achieved.
Furthermore, a first sealing ring and a second sealing ring are arranged between the outer circumferential surface of the sleeve and the inner circumferential surface of the valve cavity, and the air inlet cavity is positioned between the first sealing ring and the second sealing ring; thereby preventing leakage at both ends of the intake chamber.
Furthermore, a first sealing element which is used for being abutted against the bottom end part of the sleeve is fixed on the valve core; the first sealing element on the valve core is abutted to the end part of the bottom end of the sleeve, so that the sealing performance of the valve core for plugging the bottom end opening of the sleeve can be improved, and the leakage of the flow valve in a closed state is prevented.
Further, the valve core is in threaded connection with the bottom end of the valve rod.
Furthermore, a lower step part protrudes from the concave part of the valve rod, and the valve core props against the lower surface of the lower step part; the design of lower step portion can be convenient for the case can the butt when the screw thread installation, improves the fastness of installation.
Further, a third sealing ring is arranged between the valve core and the valve rod; thereby improving the sealing performance between the valve core and the valve rod.
Further, a second sealing element is arranged between the outer peripheral surface of the valve rod and the inner peripheral surface of the sleeve; thereby improving the sealing between the first chamber and the third chamber.
The utility model has the advantages that: the utility model discloses the proportional flow valve of self-balancing utilizes valve rod and sleeve to separate the valve pocket for first chamber, second chamber and third chamber to fluid medium makes its power that produces the displacement tend to in the valve rod to be balanced, thereby realizes reducing or avoids fluid medium to the interference of the aperture size of case under closing or the state of opening, ensures that the aperture of case is controlled by actuating mechanism completely, and flow control precision is stable.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a self-balancing proportional flow valve of the present invention;
FIG. 2 is an enlarged partial schematic view of A of FIG. 1;
fig. 3 is a schematic diagram of the self-balancing proportional flow valve of the present invention when open.
In the figure: 1. a valve body 101, a valve cavity 102, a P1 port, 103 and a P2 port;
2. a sleeve 201, an elastic cavity 202 and a communication hole;
3. the valve comprises a valve rod 301, an inner concave part 302, an upper stress surface 303, an upper step part 304, a lower step part 305 and a flow channel;
4. a first cavity, 5, a second cavity, 6, a third cavity, 7 and an air inlet cavity;
8. a valve core;
9. a lower stress surface;
10. proportional electromagnet 1001 and push rod;
11. an elastic element;
12. the sealing device comprises a first sealing ring, 13, a second sealing ring, 14, a first sealing element, 15, a third sealing ring, 16, a second sealing element, 17, a fourth sealing ring, 18 and an end cover.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the invention only in a schematic way, and thus show only the components that are relevant to the invention, and the directions and references (e.g., upper, lower, left, right, etc.) may be used only to help describe the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
Example 1
As shown in fig. 1-3, a self-balancing proportional flow valve includes:
a valve body 1 having a valve chamber 101, a P1 port 102, and a P2 port 103;
the sleeve 2 is fixedly arranged in the valve cavity 101;
the valve rod 3 is slidably mounted in the sleeve 2, the bottom end of the valve rod 3 is provided with an inner concave part 301 with an inner concave peripheral surface, an upper force bearing surface 303 is formed between the upper end of the inner concave part 301 and the outer peripheral surface of the valve rod 3, a first cavity 4 is formed between the inner concave part 301 of the valve rod 3 and the inner peripheral surface of the sleeve 2, the P1 port 102 is communicated with the first cavity 4, the sleeve 2 and the valve rod 3 inside the sleeve 2 divide the valve cavity 101 into a second cavity 5 located below and a third cavity 6 located above, the second cavity 5 is communicated with the third cavity 6 through a flow channel 305, and the P2 port 103 is communicated with the second cavity 5;
the valve core 8 is arranged at the bottom end of the valve rod 3, and a lower stress surface 9 is formed between the top end of the peripheral surface of the valve core 8 and the peripheral surface of the valve rod 3;
the actuating mechanism is used for driving the valve rod 3 and the valve core 8 on the valve rod to move close to or away from the bottom end opening of the sleeve 2, and when the valve core 8 is close to the lower stress surface 9 and props against the bottom end part of the sleeve 2 to plug the bottom end opening of the sleeve 2, the first cavity 4 is isolated from the second cavity 5; when the spool 8 is away from the bottom end of the sleeve 2, the first chamber 4 and the second chamber 5 are in communication.
The flow passage 305 is formed inside the valve rod 3, a bottom opening of the flow passage 305 is communicated with the second chamber 5, and a top opening of the flow passage 305 is communicated with the third chamber 6.
When the valve core 8 blocks the bottom end opening of the sleeve 2, the fluid medium in the first cavity 4 generates an upward thrust F1 on the upper force-bearing surface 302, and the fluid medium in the first cavity 4 generates a downward thrust F2 on the lower force-bearing surface 9, wherein F1 is F2; the flow valve can realize complete self-balance in a closed state, wherein the magnitude of the stress surface is correspondingly controlled according to the relation between the pressure and the stress area, so that the acting force can be equal.
When the valve core 8 is far away from the end part of the bottom end of the sleeve 2, so that the first cavity 4 is communicated with the second cavity 5, the fluid medium in the first cavity 4 generates an upward thrust F3 on the upper force bearing surface 302, the fluid medium in the first cavity 4 generates a downward thrust F4 on the lower force bearing surface 9, the fluid medium in the second cavity 5 generates an upward thrust F5 on the bottom end of the valve core 8 and the bottom end of the valve rod 3, and the fluid medium in the third cavity 6 generates a downward thrust F6 on the top end of the valve core 8, wherein F3+ F5 is F4+ F6; therefore, complete self-balance can be realized in the opening state of the flow valve, wherein the magnitude of the stress surface is correspondingly controlled according to the relation between the pressure intensity and the stress area, so that the acting force can be equal.
The actuator is a proportional electromagnet 10, a push rod 1001 of the proportional electromagnet 10 is fixed on a valve rod 3, an elastic element 11 is arranged between the valve rod 3 and a sleeve 2, the elastic element 11 specifically adopts a spring, one end of the elastic element 11 props against a valve core 8, the other end of the elastic element props against the sleeve 2, the proportional electromagnet 10 is fixed at the upper end of the valve body 1, and a third cavity 6 is formed among the proportional electromagnet 10, the valve rod 3 and the sleeve 2; the push rod 1001 of the proportional electromagnet 10 can be clamped, connected by threads, welded or connected by interference to fix the valve rod 3, so that the direct-acting control is realized, and the response speed is high;
in the embodiment, the sleeve 2 is provided with an elastic cavity 201, the upper end of the valve rod 3 is provided with an upper step part 303, one end of the spring is propped against the cavity bottom of the elastic cavity 201, and the other end of the spring is propped against the lower surface of the upper step part 303, so that a larger-size spring can be installed to increase the elasticity which can be improved by the spring;
in this embodiment, the proportional electromagnet 10 is fixed on the end cover 18, the end cover 18 is fixed on the top end of the valve body 1, and the fourth sealing ring 17 is arranged between the end cover 18, the proportional electromagnet 10 and the sleeve 2.
An air inlet cavity 7 is arranged between the outer circumferential surface of the sleeve 2 and the inner circumferential surface of the valve cavity 101, the air inlet cavity 7 is communicated with the P1 port 102, a communication hole 202 is formed in the sleeve 2, and the air inlet cavity 7 is communicated with the first cavity 4 through the communication hole 202; by means of the arrangement of the air inlet cavity 7, the gas introduced from the port P1 102 enters the air inlet cavity 7 and then enters the first cavity 4 from the communication hole 202, so that a certain flow stabilizing effect is achieved.
A first sealing ring 12 and a second sealing ring 13 are arranged between the outer peripheral surface of the sleeve 2 and the inner peripheral surface of the valve cavity 101, and the air inlet cavity 7 is positioned between the first sealing ring 12 and the second sealing ring 13; thereby preventing the leakage at the two ends of the air inlet chamber 7, and the first sealing ring 12 and the second sealing ring 13 can be O-shaped sealing rings.
A first sealing member 14 for abutting against the bottom end of the sleeve 2 is fixed on the valve core 8; the first sealing element 14 on the valve core 8 is abutted against the end part of the bottom end of the sleeve 2, so that the sealing performance of the valve core 8 for plugging the bottom end opening of the sleeve 2 can be improved, and the leakage of the flow valve in a closed state is prevented; the valve core 8 is in threaded connection with the bottom end of the valve rod 3, wherein when the valve core 8 is in threaded connection with the valve rod 3, a lower step part 304 protrudes from the inner concave part 301 of the valve rod 3, and the valve core 8 props against the lower surface of the lower step part 304; the lower step part 304 is designed to facilitate the valve core 8 to abut against during threaded installation, so that the installation firmness is improved, a third sealing ring 15 is arranged between the valve core 8 and the valve rod 3, and the third sealing ring 15 is an O-shaped sealing ring to improve the sealing property between the valve core 8 and the valve rod 3; or the valve core 8 and the valve rod 3 are integrally formed, and when the valve core 8 and the valve rod 3 are integrally formed, a sealing ring is not needed to seal between the valve core 8 and the valve rod 3.
A second sealing element 16 is arranged between the outer circumferential surface of the valve rod 3 and the inner circumferential surface of the sleeve 2; here, for dynamic sealing, the second sealing element 16 is an O-ring or lip-ring, which improves the sealing between the first chamber 4 and the third chamber 6.
It is worth noting that the flow control coverage of the proportional flow valve in the embodiment is wide, product development with different flow requirements can be rapidly realized by changing the sizes of the valve core 8 and the valve rod 3, the proportional flow valve is suitable for open-loop control and PID closed-loop control, the whole structure is simple, the cost is low, and the proportional flow valve is suitable for rapid platform development and commercialization of products.
The working principle of the self-balancing proportional flow valve in the embodiment is as follows:
in the initial state, no signal is input to the proportional electromagnet 10, the valve rod 3 is in the original position under the action of the spring, the valve core 8 on the valve rod 3 is abutted against the lower end opening of the sleeve 2, at the moment, the compressed air introduced from the port P1 102 is only kept in the first cavity 4, namely the isolation from the port P1 to the port P2 103, and the flow valve is in the normally closed state; the fluid medium in the first cavity 4 generates opposite acting forces on the upper force-bearing surface 302 and the lower force-bearing surface 9 respectively, so that the forces generated by the fluid medium acting on the valve rod 3 to displace the valve rod are close to balance, and self balance under the closed state of the flow valve is formed;
when a signal is input to the proportional electromagnet 10, the valve rod 3 overcomes the force of the spring and moves downwards under the action of the push rod 1001 of the proportional electromagnet 10, at the moment, the valve core 8 gradually leaves away from the bottom end part of the sleeve 2, the opening degree of the valve core 8 is gradually increased, the P1 port 102 is communicated with the P2 port 103, and the electric proportional flow valve works; when the flow valve is opened, the fluid media in the second cavity 5 and the third cavity 6 respectively generate opposite acting forces on two ends of the valve rod 3, so that the forces generated by the fluid media acting on the valve rod 3 to displace the valve rod are close to balance, and self balance of the flow valve in an opened state is formed; the interference of the fluid medium on the opening degree of the valve core 8 is reduced or avoided, and the opening degree of the valve core 8 is ensured to be completely determined by the input signal, namely the larger the input signal is, the larger the stroke of the push rod 1001 of the proportional electromagnet 10 is, the larger the opening degree of the valve core 8 is, so that the larger the flow output by the port 103 of P2 is, otherwise, the flow output by the port 103 of P2 is.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (12)
1. The utility model provides a proportional flow valve of self-balancing which characterized in that: the method comprises the following steps:
a valve body (1) having a valve cavity (101), a P1 port (102), and a P2 port (103);
the sleeve (2) is fixedly arranged in the valve cavity (101);
the valve rod (3) is slidably mounted in the sleeve (2), an inner concave part (301) with an inner concave peripheral surface is arranged at the bottom end of the valve rod (3), an upper stress surface (302) is formed between the upper end of the inner concave part (301) and the outer peripheral surface of the valve rod (3), a first cavity (4) is formed between the inner concave part (301) of the valve rod (3) and the inner peripheral surface of the sleeve (2), a P1 port (102) is communicated with the first cavity (4), the sleeve (2) and the valve rod (3) inside the sleeve (2) divide the valve cavity (101) into a second cavity (5) located below and a third cavity (6) located above, the second cavity (5) and the third cavity (6) are communicated through a flow channel (305), and a P2 port (103) is communicated with the second cavity (5);
the valve core (8) is arranged at the bottom end of the valve rod (3), and a lower stress surface (9) is formed between the top end of the peripheral surface of the valve core (8) and the peripheral surface of the valve rod (3);
the actuating mechanism is used for driving the valve rod (3) and the valve core (8) on the valve rod to move close to or away from the bottom end opening of the sleeve (2), and when the valve core (8) is close to the lower stress surface (9) and props against the bottom end part of the sleeve (2) to plug the bottom end opening of the sleeve (2), the first cavity (4) is isolated from the second cavity (5); when the valve core (8) is far away from the bottom end part of the sleeve (2), the first cavity (4) is communicated with the second cavity (5).
2. The self-balancing proportional flow valve of claim 1, wherein: the flow channel (305) is arranged in the valve rod (3), the bottom end opening of the flow channel (305) is communicated with the second cavity (5), and the top end opening of the flow channel (305) is communicated with the third cavity (6).
3. The self-balancing proportional flow valve of claim 1, wherein: when the valve core (8) blocks the bottom end opening of the sleeve (2), the fluid medium in the first cavity (4) generates an upward thrust F1 on the upper force bearing surface (302), and the fluid medium in the first cavity (4) generates a downward thrust F2 on the lower force bearing surface (9), wherein F1 is F2.
4. The self-balancing proportional flow valve of claim 3, wherein: when the valve core (8) is far away from the end part of the bottom end of the sleeve (2) to enable the first cavity (4) and the second cavity (5) to be communicated, the fluid medium in the first cavity (4) generates an upward thrust F3 to the upper force bearing surface (302), the fluid medium in the first cavity (4) generates a downward thrust F4 to the lower force bearing surface (9), the fluid medium in the second cavity (5) generates an upward thrust F5 to the bottom end of the valve core (8) and the bottom end of the valve rod (3), and the fluid medium in the third cavity (6) generates a downward thrust F6 to the top end of the valve core (8), wherein F3+ F5 is F4+ F6.
5. The self-balancing proportional flow valve of claim 3, wherein: the actuating mechanism is a proportional electromagnet (10), a push rod (1001) of the proportional electromagnet (10) is fixed on a valve rod (3), an elastic element (11) is arranged between the valve rod (3) and a sleeve (2), one end of the elastic element (11) abuts against a valve core (8), the other end of the elastic element abuts against the sleeve (2), the proportional electromagnet (10) is fixed at the upper end of a valve body (1), and a third cavity (6) is formed among the proportional electromagnet (10), the valve rod (3) and the sleeve (2).
6. The self-balancing proportional flow valve of claim 1, wherein: an air inlet cavity (7) is arranged between the outer circumferential surface of the sleeve (2) and the inner circumferential surface of the valve cavity (101), the air inlet cavity (7) is communicated with the P1 port (102), a communication hole (202) is formed in the sleeve (2), and the air inlet cavity (7) is communicated with the first cavity (4) through the communication hole (202).
7. The self-balancing proportional flow valve of claim 6, wherein: a first sealing ring (12) and a second sealing ring (13) are arranged between the outer circumferential surface of the sleeve (2) and the inner circumferential surface of the valve cavity (101), and the air inlet cavity (7) is located between the first sealing ring (12) and the second sealing ring (13).
8. The self-balancing proportional flow valve of claim 1, wherein: and a first sealing element (14) which is used for being abutted against the bottom end part of the sleeve (2) is fixed on the valve core (8).
9. The self-balancing proportional flow valve of claim 1, wherein: the valve core (8) is in threaded connection with the bottom end of the valve rod (3).
10. The self-balancing proportional flow valve of claim 9, wherein: a lower step part (304) protrudes from the inner concave part (301) of the valve rod (3), and the valve core (8) props against the lower surface of the lower step part (304).
11. The self-balancing proportional flow valve of claim 9, wherein: and a third sealing ring (15) is arranged between the valve core (8) and the valve rod (3).
12. The self-balancing proportional flow valve of claim 5, wherein: a second sealing element (16) is arranged between the outer circumferential surface of the valve rod (3) and the inner circumferential surface of the sleeve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188619.5U CN214404705U (en) | 2021-01-22 | 2021-01-22 | Self-balancing proportional flow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188619.5U CN214404705U (en) | 2021-01-22 | 2021-01-22 | Self-balancing proportional flow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214404705U true CN214404705U (en) | 2021-10-15 |
Family
ID=78047727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120188619.5U Active CN214404705U (en) | 2021-01-22 | 2021-01-22 | Self-balancing proportional flow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214404705U (en) |
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2021
- 2021-01-22 CN CN202120188619.5U patent/CN214404705U/en active Active
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