An adaptive flow switchable air pressure control valve

Abstract

The present application belongs to the valve technology, and relates to a self-adaptive flow switchable air pressure control valve. The control valve comprises a valve body, a valve core, a small spring, a top rod seat, a large spring, a middle spring, a top rod cover, a top rod and a valve cover.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of valves, and relates to a self-adaptive flow switchable air pressure control valve. BACKGROUND

[0002] The air pressure control valve is a device for controlling the pressure, flow and direction of gas, and is an important pressure control component in the field of aerospace. The air pressure control valve is mainly divided into a pressure control valve, a flow control valve and a direction control valve. Tradically, the valve is designed by using the principle of balance between the air pressure acting on the valve core and the spring force. The spring and the valve core are usually only one piece. The function of the valve is single, the pressure or flow of the valve is adjusted by a manual mode, the design calculation is simple, the assembly and debugging are difficult, and the valve is suitable for batch production.

[0003] With the development of valve technology, the design and manufacturing technology of the air pressure control valve has also made great progress. In the field of aerospace, the air pressure control valve has higher requirements, has a great gas flow self-adaptive range, the flow change has little influence on the pressure, has the ability of rapid switching of two pressure states, realizes the control of the pressure range, and has the characteristics of miniaturization and light weight. The above requirements cannot be realized by using the traditional structure, and the product structure needs to be designed and calculated according to the basic principle of the air pressure control valve, and the control mode needs to be creatively improved. SUMMARY

[0004] The present application utilizes the structure of the spring combination to realize a great gas flow self-adaptive range, rapid switching of two pressure systems, and has the characteristics of small size and light weight.

[0005] TECHNICAL SCHEME

[0006] A self-adaptive flow switchable air pressure control valve comprises a valve body, a valve core, a small spring, a top rod seat, a large spring, a middle spring, a top rod cover, a top rod and a valve cover.

[0007] The valve cover and the valve body are in structural communication through the valve port; the valve core extends into the valve cover from the valve body through the structure of the valve port, the upper end seat of the valve core is located in the valve cover, the contact surface and the valve cover form a sealing pair; the top rod seat is a stepped cylindrical ring with a lower end sealed and a large upper end and a small lower end, the lower end of the stepped cylindrical ring extends upward and protrudes higher than the push rod of the stepped cylindrical ring; the small cylindrical ring of the stepped cylindrical ring is accommodated in the upper end seat of the valve core, and a small spring is inserted into the gap between the two; the lower end of the small spring contacts the upper end seat, and the upper end is suspended or is pressed against the outer stepped surface of the stepped cylindrical ring under the action of pressure; the inner stepped surface of the stepped cylindrical ring serves as a support surface of the middle spring, the middle spring is sleeved on the top rod and abuts against the bottom end surface of the top rod, the upper end surface of the top rod abuts against the inwardly turned edge of the upper segment of the top rod cover, and the lower end opening of the top rod cover abuts against the large cylindrical ring of the stepped cylindrical ring; the inner through hole of the top rod is a stepped through hole with a small lower end and a large upper end, a movement channel fixed in the center of the valve cover is inserted into the through hole, and the push rod is inserted into the lower end of the inner hole to facilitate reciprocating movement in the movement channel under the action of pressure; the large spring is sleeved between the upper end seat and the valve cover.

[0008] The position of the movement channel and the inner hole is controlled by the stepped surface of the inner hole, and the movement channel is externally provided with a push mechanism outside the valve cover;

[0009] When the push mechanism is located outside the valve cover, the small spring works together with the middle and large springs;

[0010] When the push mechanism is pushed into the valve cover, the movement channel moves downward, the small spring is pressed to death by the outer stepped surface, and only the middle and large springs work.

[0011] It also includes a small gasket located between the valve cover and the valve port.

[0012] It also includes a positioning ring fixed at the top end of the valve cover, which serves as an upper spring seat of the large spring and abuts against the large spring to position the large spring.

[0013] A large gasket is arranged between the positioning ring and the valve cover.

[0014] An oil passage is arranged around the valve port.

[0015] The middle spring and the small spring are in series.

[0016] The middle and small spring group in series and the large spring are in parallel.

[0017] The application utilizes the principle of balance of the combined elastic force of large spring, medium spring and small spring and the gas pressure in the valve body, adopts the form of series connection of the medium spring and the small spring and parallel connection of the large spring, and guarantees that the small spring can be limited under certain conditions by reasonably designing the stop structure, so that a brand-new gas pressure control valve structure is formed. The gas pressure control valve with the structure has a great gas flow self-adapting range, and the flow change has basically no influence on the pressure. In addition, the top rod of the gas pressure control valve can move downward under the action of external force, so that the small spring loses the elastic force, the elastic force of the spring combination changes, the pressure in the valve body is influenced, and the quick switching of two pressure states is realized. Meanwhile, the reasonable limiting structure greatly reduces the moving range of the spring, and the miniaturization and light weight of the gas pressure control valve are realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of a self-adapting flow switchable gas pressure control valve. Wherein, 1 is a valve body, 2 is a valve port, 3 is a valve core, 4 is a small spring, 5 is a top rod seat, 6 is a large spring, 7 is a medium spring, 8 is a top rod cover, 9 is a top rod, 10 is a small gasket, 11 is a positioning ring, 12 is a large gasket, and 13 is a valve cover. DETAILED DESCRIPTION

[0019] The application provides a self-adapting flow switchable gas pressure control valve, as shown in the figure, which comprises a valve body 1, a valve port 2, a valve core 3, a small spring 4, a top rod seat 5, a large spring 6, a medium spring 7, a top rod cover 8, a top rod 9, a small gasket 10, a positioning ring 11, a large gasket 12 and a valve cover 13. The small spring and the medium spring are connected in series, and then connected in parallel with the large spring. The pre-compression amount and the stop displacement of the three springs are determined by reasonably designing the part structure, so that the gas pressure control valve realizes the following functions: Figure 1 1. A great gas flow self-adapting range, and the flow change basically has no influence on the pressure;

[0020] 2. The ability of quick switching of two pressure states is provided, and the control of the pressure range is realized;

[0021] 3. The characteristics of miniaturization and light weight are provided.

[0022] The top rod of the gas pressure control valve can move downward under the action of external force, so that the small spring reaches the limiting position, loses the elastic force, the elastic force of the spring combination changes, the pressure in the valve body is influenced, and the quick switching of two pressure states is realized.

[0023] The specific working process is as follows:

[0024]

[0025] ​When the small spring works, when the valve core and the valve port seal, the oil flows into the valve port from the valve body, and after the oil pressure of the valve port is greater than the elastic force of the large spring, the valve core is pushed away, the oil enters the inner cavity, and the oil continues to push the valve core to move downward until the small spring is pressed against the outer stepped surface. The small spring is compressed to resist the pushing force of the valve core, and at the same time, the middle spring is compressed by the pushing force of the valve core. At this time, the elastic force of the small spring can reduce the pressure borne by the middle spring in the early stage, until the valve core and the valve port are completely separated, and the valve opening is completed.

[0026] When the small spring does not work, when the small spring works, when the valve core and the valve port seal, the oil flows into the valve port from the valve body, and after the oil pressure of the valve port is greater than the elastic force of the large spring, the valve core is pushed away, the oil enters the inner cavity, and the oil continues to push the valve core to move downward, and the middle spring is compressed by the pushing force of the valve core. Until the valve core and the valve port are completely separated, and the valve opening is completed.

[0027] When the input flow is small, the valve core reaches a balanced state under the action of the pressure in the valve body and the combined elastic force of the large spring, the small spring and the middle spring, thereby ensuring the stability of the pressure in the valve body. When the input flow is large, the valve core moves upward under the action of the force, the small spring is further compressed to reach a stop state, and the valve core quickly reaches a balanced state under the action of the pressure in the valve body and the combined elastic force of the large spring and the middle spring. The small spring has extremely small rigidity, and the addition of the small spring in the gas pressure control valve can effectively improve the sensitivity and the influence of small flow on the valve core. At the same time, the design of the stop structure can limit the deformation amount of the small spring and reduce the size of the gas pressure control valve. The middle spring has relatively large rigidity, and the design of the middle spring in the gas pressure control valve can quickly increase the concentrated force of the valve core after the small spring is stopped, thereby controlling the gas pressure in the gas pressure control valve. The large spring has moderate rigidity, and can be connected in parallel with the small spring and the middle spring to provide elastic force for the valve core and balance the gas pressure in the valve body.

[0028] The gas pressure control valve can realize rapid switching between two pressure states. When the top rod is in a free state, the valve core reaches a balanced state with the gas pressure in the valve body under the action of the combined force of the large spring, the middle spring and the small spring. When the top rod is pressed down by external force, the small spring reaches a stop state under the limitation of the external structure, and the valve core reaches a balanced state with the gas pressure in the valve body again under the action of the combined force of the large spring and the middle spring. Since the small spring is limited, it loses its due role. The combined force of the springs changes obviously, which causes the pressure state in the valve body to change obviously.

[0029] At the same time, the small spring has a very short limiting distance, which can effectively reduce the size and weight of the gas pressure control valve, and realize the miniaturization and light weight of the gas pressure control valve.

[0030] The application solves the problem of structural design of a new type of air pressure control valve in the field of aerospace, breaks through the design idea of traditional air pressure control valves, expands the product function, changes the existing valve pressure or flow adjustment mode through manual mode, realizes a large gas flow self-adaptive range, realizes rapid switching of two pressure maintenance systems, and considers the miniaturization and light weight characteristics.

Claims

1. An adaptive flow switchable air pressure control valve, characterized by, It comprises: Valve body (1), valve core (3), small spring (4), top rod seat (5), large spring (6), middle spring (7), top rod cover (8), top rod (9), valve cover (13); Valve cover (13) and valve body (1) through the structure of valve port (2) communication; Valve core (3) from the valve body through the structure of valve port into the valve cover (13), the upper end of valve core (3) seat located in the valve cover (13), contact surface and valve cover (13) form sealing pair; Top rod seat (5) is the lower end of the sealing and the upper large lower small step cylinder ring, the step cylinder ring lower end upward protruding higher than the step cylinder ring push rod; Small cylinder ring of step cylinder ring is contained in the upper end of valve core (3) seat, both gap inserted with small spring; Small spring lower end contact upper end seat, upper end suspended, or under the action of pressure against the outer step surface of step cylinder ring; The inner step surface of step cylinder ring as a support surface of middle spring, middle spring is sleeved on the top rod (9), and abuts against the bottom end surface of top rod (9), the upper end surface of top rod (9) abuts against the upper segment of top rod cover (8) inner flange, the lower end opening of top rod cover (8) abuts against the large cylinder ring of step cylinder ring; The inner hole of top rod (9) is a step through hole with small lower end and large upper end, the through hole is inserted into the movement channel fixed in the center of valve cover (13), the push rod is inserted from the lower end of the inner hole, so as to make reciprocating motion in the movement channel under the action of pressure; The upper end of the seat and the valve cover (13) are sleeved with the large spring (6).

2. The control valve according to claim 1, characterized in that The position of movement channel and inner hole is controlled by the step surface of inner hole, and the movement channel is externally provided with a push mechanism outside the valve cover (13); When the push mechanism is located outside the valve cover, the small spring works together with the middle and large springs; When the push mechanism is pushed into the valve cover, the movement channel moves downward, the small spring is pressed to death by the outer step surface, and only the middle and large springs work.

3. The control valve of claim 1, wherein It also includes a small gasket (10) between the valve cover (13) and the valve port (2).

4. The control valve of claim 1, wherein It also includes a positioning ring (11) fixed at the top end of the valve cover, which serves as the upper spring seat of the large spring, abuts against the large spring and positions the large spring.

5. The control valve of claim 1, wherein The large gasket (12) is arranged between the positioning ring and the valve cover.

6. The control valve of claim 1, wherein The oil hole is arranged around the valve body.

7. The control valve of claim 1, wherein The middle spring and the small spring are in series.

8. The control valve of claim 1, wherein The series of middle and small springs and the large spring are in parallel.

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