CN217463234U - Bidirectional flow control mechanism - Google Patents

Abstract

The utility model discloses a two-way flow control mechanism includes: the air inlet is used for being communicated with a target to be controlled; the air outlet is communicated with the atmosphere; the seal is positioned between the air inlet and the air outlet and is provided with a conical surface; the end socket is adapted to the conical surface of the seal; when the end socket is far away from the seal, the over-flow at the seal is increased; when the seal head is close to the seal, the over-flow at the seal is reduced. The utility model discloses a two-way flow control mechanism makes the pilot valve can quick response when establishing negative pressure state for the vacuum valve, and the pilot valve makes the balanced process of air pressure in the vacuum valve slow down to reach the effect that prevents overflow and the vacuum valve frequently opens and close in the well.

Description

Bidirectional flow control mechanism

Technical Field

The utility model relates to a control mechanism of vacuum valve, in particular to two-way flow control mechanism.

Background

Vacuum valves typically include a pilot valve and a main valve. The detection pipe is arranged in the well, when the liquid level of the well reaches a set height, the liquid level difference between the inside and the outside of the detection pipe enables a certain air pressure to be formed in the detection pipe, the air pressure is transmitted to the pilot valve to drive the pilot valve to act, the main valve is communicated with the vacuum pumping equipment under the action of the pilot valve, and the main valve is in a negative pressure state, so that the water inlet and the water outlet of the vacuum valve are communicated, and water pumping is realized. When the air pressure in the detecting pipe is insufficient, the main valve is cut off from the vacuum-pumping equipment under the action of the pilot valve, the air pressure of the main valve is balanced, so that the water inlet and the water outlet of the vacuum valve are cut off, and the vacuum valve stops working. The vacuum valve is an important actuating mechanism applied to a drainage system, and the vacuum valve is driven to work by air pressure generated by the level of the liquid in the environment, so that the vacuum valve has the advantage of no need of an external power supply.

Whether the vacuum valve can be automatically switched to the water pumping functional state is only related to the air pressure generated by the liquid level, and the state switching of the pilot valve is further reflected to be only related to the liquid level. During the pumping process of the vacuum valve, the liquid level can drop, when the liquid level drops to a set value, the air pressure is insufficient, and the pilot valve can drive the vacuum valve to stop working; when the liquid level rises to a set value, the air pressure reaches the set value, and the pilot valve can drive the vacuum valve to continue working. In the same well, there are large fluctuations in the flow rate of water even over a short period of time. Therefore, there may be problems as follows: when the flow is large, the liquid level rapidly exceeds a set value, and the water pumping speed of the vacuum valve is lower than the water inlet speed in the well, so that water cannot be pumped away by the vacuum valve and overflows out of the well. When the flow is small, the liquid level is frequently lower than the set value, the vacuum valve can be opened and closed frequently, the fatigue of components in the vacuum valve is accelerated, and the service life of the vacuum valve is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve at least some of the above problems, the present invention is an improvement in the prior art.

The utility model provides a two-way flow control mechanism holds the chamber intercommunication with the second of pilot valve and makes the pilot valve reach following effect: when the air pressure in the first cavity of the pilot valve reaches a preset value, the valve core of the pilot valve moves in the positive direction, and the second cavity of the pilot valve exhausts air at a first speed through the bidirectional flow control mechanism; when the air pressure in the first cavity of the pilot valve is lower than a preset value, the valve core of the pilot valve moves reversely, and the second cavity of the pilot valve is used for air inlet at a second speed through the bidirectional flow control mechanism; the first speed is higher than the second speed, so that the forward movement of the pilot valve is fast, and the reverse movement of the pilot valve is slow; finally, the process of building the negative pressure state of the vacuum valve is fast, and the process of recovering the air pressure balance is slow, namely, when the liquid level in the well is close to a set value, the vacuum valve can pump water quickly; when the liquid level in the well deviates from the set value, the switching of the state can be delayed by the vacuum valve, so that the vacuum valve can continuously keep the state, the condition that water overflows out of the well can be prevented, and the condition that the vacuum valve is frequently switched can be avoided, so that the fatigue of the vacuum valve is accelerated.

To achieve the above-mentioned effect, in one embodiment, the bidirectional flow control mechanism includes: the air inlet is used for being communicated with a target to be controlled; the air outlet is communicated with the atmosphere; the seal is positioned between the air inlet and the air outlet and is provided with a conical surface; the end socket is adapted to the conical surface of the seal; when the seal head is far away from the seal, the over-flow at the seal is increased; when the seal head is close to the seal, the overflowing amount at the seal is reduced.

In the scheme, after the bidirectional flow control mechanism is used for being communicated with the second containing cavity of the pilot valve, in the process of increasing the air pressure of the first containing cavity of the pilot valve, the second containing cavity exhausts air through the bidirectional flow control mechanism, in the process of exhausting the second containing cavity of the pilot valve, the seal head floats to move in the direction far away from the seal, and due to the fact that the seal is provided with the conical surface, in the process that the seal head is far away from the seal, the gap between the seal head and the seal is increasingly large, the overflowing amount of the seal is increased, and therefore the exhausting speed is accelerated. In the process of reducing the air pressure of the first containing cavity of the pilot valve, the second containing cavity is used for air inlet through the bidirectional flow control mechanism, in the process of air inlet of the second containing cavity of the pilot valve, the gap between the seal head and the seal is smaller and smaller in the process that the seal head moves towards the seal under the action of self weight, and the over-flow at the seal position is reduced, so that the air inlet time is prolonged.

Optionally, the end socket is a sphere or a cone. In an optional scheme, the end socket is designed into a sphere or a conical body, the contact surface between the end socket and the seal is as small as possible, the end socket and the seal are in a non-sealing state, external air can permeate through a fine seam between the end socket and the seal, the situation that air pressure in a pilot valve cannot be balanced and a deformation part is held back after deformation and cannot be recovered is avoided.

Optionally, the end socket is made of rubber. In an optional scheme, the seal head is made of rubber materials, so that the seal head can be made to be light in weight, the air pressure required by the drive of the seal head to float is small, and the quick opening of bidirectional flow control is ensured. The rubber has stable performance and strong capability of resisting the corrosion of sewage environment.

Optionally, the end socket is made of metal. In an optional scheme, the end socket can be made of aluminum, the aluminum has the characteristic of low density, the weight can be smaller, and the effect that the end socket can be driven by smaller air pressure is achieved.

Optionally, the end socket is of a hollow structure. In an alternative scheme, the end socket is made into a hollow structure so as to achieve the effect that the end socket can be driven by small air pressure.

In another embodiment to achieve the same effect, the bidirectional flow control mechanism includes: the air inlet is used for being communicated with a target to be controlled; the air outlet is communicated with the atmosphere; the cover plate is connected to the air outlet and provided with an air vent communicated with the air inlet.

In the above optional scheme, after the bidirectional flow control mechanism is used for being communicated with the second cavity of the pilot valve, in the process of increasing the air pressure of the first cavity of the pilot valve, the second cavity is exhausted through the air outlet of the bidirectional flow control mechanism. And in the process of reducing the air pressure of the first containing cavity of the pilot valve, air is fed through a vent hole in a cover plate of the bidirectional flow control mechanism. The overflowing area of the vent hole is far smaller than the excessive area of the air outlet, so that the air inlet speed of the bidirectional flow control mechanism is low, and the air inlet time of the second cavity of the pilot valve is prolonged.

Optionally, the air outlet is provided with a conical surface, and the cover plate is rotatably connected to the conical surface.

Optionally, the gas outlet is provided with a fixed cavity, wherein one end of the fixed cavity is communicated with the gas inlet, and the other end is communicated with the atmosphere, the cover plate and the first spring are coaxially arranged in the fixed cavity, the cover plate is close to the end of the fixed cavity communicated with the gas inlet, and the first spring is close to the end of the fixed cavity communicated with the atmosphere.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of a vacuum valve;

FIG. 2 is a schematic illustration of an embodiment of a pilot valve;

FIG. 3 is a schematic view of a pilot valve according to the present invention;

fig. 4 is a schematic view of a two-way flow control mechanism according to an embodiment of the present invention;

fig. 5 is a schematic view of a second embodiment of the bidirectional flow control mechanism of the present invention;

FIG. 6 is a schematic view of a pilot valve according to the present invention;

FIG. 7 is a schematic view of a third embodiment of the pilot valve of the present invention;

fig. 8 is a schematic view of a pilot valve according to the fourth embodiment of the present invention.

Reference numerals are as follows:

p1-pressure guide port, P2-exhaust port, P3-negative pressure air inlet, and P4-negative pressure air outlet;

011-negative pressure cavity, 012-atmospheric cavity, 013-water passing cavity, 02-diaphragm, 03-spacer, 04-driving rod, 05-sealing block, 06-third spring, 07-gas-liquid separator, 08-water outlet, 09-water inlet, 010-air pressure conduit;

51-a linker;

61. 62, 63, 64-trachea;

11-diaphragm, 12-first cavity, 13-second cavity, 14-second spring.

21-valve stem, 22-sealing block;

31A-a first bidirectional flow control mechanism, 311-an air inlet, 312-a seal, 313-an air outlet, 3141-a spherical seal head and 3142-a conical seal head;

31B-two-way flow control mechanism two, 3101 a-rotating cover plate, 3102-vent hole, 3101B-movable cover plate, 3103-first spring.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only preferred embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification belong to the protection scope of the present invention.

In the application, the valve body is a main body structure of the finger valve, the valve core is an action mechanism of the finger valve, and the valve core moves in the valve body so as to realize the functions of opening and closing or switching a flow passage.

In this application, a deformable element is a component whose shape can be changed under a force. The elastic sheet or the membrane is one of the deformation pieces in the application. The elastic sheet is a sheet-shaped part with a bidirectional deformation function, namely, the shape of the elastic sheet can be deformed when the elastic sheet is acted by an acting force, and the shape of the elastic sheet can be automatically recovered when the acting force is cancelled. Generally, the membrane refers to a sheet-shaped part with a unidirectional deformation function, namely, the membrane can deform in shape when being acted by force, and the shape can be recovered only by applying reverse force.

In the present application, the forward and reverse movements are relative.

In the present application, the return member includes, but is not limited to, a spring.

In the present application, "first" or "second" does not represent a degree of importance, but merely serves to distinguish different components or spaces having similar attributes.

In this application, the term "forward direction" in the context of "forward movement" refers to a direction from the first volume towards the second volume, and the term "reverse direction" in the context of "reverse movement" refers to a direction from the second volume towards the first volume.

As shown in fig. 1, as one implementation of a vacuum valve, it includes a main valve and a pilot valve. The pilot valve communicates with the main valve through a fitting 51. The diaphragm 02 divides the valve body of the main valve into a negative pressure chamber 011 and an atmospheric chamber 012. The valve core of the main valve comprises a spacer 03, a driving rod 04 and a sealing block 05. The partition 03 further partitions the valve body of the main valve into the water outlet chamber 013, so that the atmospheric chamber 012 is isolated from the water outlet chamber 013. A water outlet 08 and a water suction port 09 are also arranged on one side of the main valve where the water outlet cavity is positioned. The driving rod 04 is connected with the center of the membrane 03, and the sealing block 05 is matched with the water outlet 08. A third spring 06 is arranged in the negative pressure chamber 011, the third spring 06 being connected with the drive rod 04. The valve core of the main valve can be communicated with or cut off the water outlet 08 and the water suction port 09 through the sealing block 05. When the sealing block 05 of the main valve is sealed with the water outlet 08, the water outlet 08 is blocked from the water suction port 09; when the sealing block 05 of the main valve is unsealed from the water outlet, the water outlet 08 is communicated with the water suction port 09, so that water pumping is realized.

The working principle is as follows: the pilot valve pilot port P1 communicates with the pneumatic conduit 010 through the air tube 61. When the liquid level in the well reaches a certain height, the liquid level difference between the inside and the outside of the air pressure conduit 010 causes the air pressure in the air pressure conduit to have a certain air pressure. The air pressure is transmitted to a first cavity of the pilot valve through a pilot pressure port P1 of the pilot valve, the air pressure of the first cavity of the pilot valve is increased, so that a deformation piece of the pilot valve is deformed and a valve core of the pilot valve is driven to act, the pilot valve enables a negative pressure air inlet P3 to be communicated with a negative pressure cavity 011 of a main valve, a negative pressure air inlet P3 of the pilot valve is communicated with vacuumized equipment through an air pipe 63, a gas-liquid separator 07 is further arranged in the vacuumized equipment, and the gas-liquid separator 07 is used for purifying vacuum. The exhaust port P2 of the pilot valve communicates with the atmosphere chamber 012 of the main valve through the gas pipe 62, and the middle section of the gas pipe 62 communicates with the atmosphere through a three-way valve. The atmosphere chamber 012 of the main valve communicates with the water outlet chamber 013 of the main valve through the air tube 64. Thus, when the pilot valve causes the negative pressure inlet port P3 to communicate with the negative pressure chamber 011 of the main valve, the vacuuming device draws vacuum to the negative pressure chamber 011, and the atmosphere chamber 012 of the main valve communicates with the atmosphere, so that the air pressure of the negative pressure chamber 011 is lower than the atmosphere chamber 012, and the valve body of the main valve is operated, the sealing block 05 of the main valve releases the seal to the water outlet 08, and water in the well flows from the water suction port 09 to the water outlet 08 and is pumped away. When the liquid level in the well drops and the air pressure of the first containing cavity of the pilot valve is reduced, the pilot valve core moves reversely, the pilot valve enables the negative pressure air inlet P3 to be blocked from the negative pressure cavity 011 of the main valve, the air outlet P2 of the pilot valve is communicated with the negative pressure cavity 011 of the main valve, and the air outlet P2 of the pilot valve is always communicated with the atmosphere, therefore, after the air pressure of the negative pressure cavity 011 is balanced with the air pressure of the atmosphere cavity 012, the valve core of the main valve acts, the sealing block 05 of the main valve is sealed on the water outlet 08, and the passage of well water from the water suction port 09 to the water outlet 08 is cut off. The state switching of the vacuum valve is only related to the liquid level in the well. During the water pumping process of the vacuum valve, the liquid level can drop, and when the liquid level drops to a set value, the vacuum valve stops working; when the liquid level continues to rise to the set value, the vacuum valve continues to operate. The flow rate of sewage is likely to fluctuate, even in a short period of time, in the same well, with large fluctuations.

Based on the above analysis, there may be the following problems: when the flow is large, the liquid level can quickly exceed a set value, and the water pumping speed of the vacuum valve is lower than the water inlet speed in the well, so that water cannot be pumped away by the vacuum valve and overflows out of the well. When the flow is small, the liquid level is frequently lower than the set value, the vacuum valve can be opened and closed frequently, the fatigue of components in the vacuum valve is accelerated, and the service life of the vacuum valve is influenced. For example: the vacuum valve is designed according to the set value of 500mm, when the liquid level in the well exceeds 500mm, the valve core of the pilot valve can be driven to move in the positive direction by the air pressure obtained by the pilot valve, and then the main valve can construct a negative pressure state, so that the vacuum valve can automatically realize the water pumping function; when the liquid level in the well is lower than 500mm, the valve core of the pilot valve can move reversely to switch states, so that the main valve restores the air pressure balance, and the vacuum valve automatically closes the water pumping function. In actual working conditions, an error exists between an actual trigger value and a set value of the pilot valve, and the flow in the well may also be dynamically changed, which may also affect the actual trigger of the pilot valve. Therefore, the vacuum valve is expected to achieve the following effects during use: when the liquid level approaches 500mm, the vacuum valve can be quickly switched to a water pumping state to prevent water in the well from overflowing; when the liquid level is lower than 500mm, the vacuum valve can be switched slowly, so that the water pumping state can be continuously maintained, and the vacuum valve is prevented from being discontinuously and frequently opened and closed in a short time.

As shown in fig. 2, one implementation of the pilot valve comprises a valve body in which a membrane 11b is arranged, which membrane 11b divides a first volume 12 and a second volume 13 in the valve body. The cartridge includes a stem 21 and a sealing block 22. The end of the valve stem 21 remote from the sealing block 22 is connected to the membrane 11b, and the sealing block 22 is used for switching the pilot valve flow passage. A spring 14 is arranged in the second volume 13 of the pilot valve in connection with the valve stem 21. The pilot valve is further provided with a pilot port P1, the pilot port P1 being in communication with the first volume 12, external air pressure being introduced into the first volume 12 through the pilot port. When the air pressure in the first cavity 12 increases to a set value, the diaphragm 11b deforms toward the second cavity 13 under the action of the air pressure, and drives the valve core to move toward the second cavity, and at this time, the spring 14 is compressed. When the air pressure in the first cavity is reduced to a set value, the spring 14 is reset, the spring 14 pushes the valve core to move towards the direction of the first cavity, and the diaphragm 11b restores the shape under the action of the valve core. The forward and reverse movement of the valve core of the pilot valve can realize the switching of the flow passage in the pilot valve. In order to ensure the function of the pilot valve for positive and negative movement, the second chamber of the pilot valve must be open to the atmosphere to ensure that the second chamber can be vented or vented.

In the present application, the effects that are desired to be achieved are: when the liquid level in the well reaches a set value in the process of pumping water by the vacuum valve, the state of the pilot valve of the vacuum valve can be switched rapidly, so that the main valve can rapidly establish a negative pressure state, thereby pumping water rapidly and preventing water from overflowing out of the well. When the liquid level is lower than the set value, the pilot valve of the vacuum valve delays the switching state, so that the negative pressure state of the main valve is maintained, water can be pumped continuously when the liquid level is lower than the set value, before the pilot valve is not switched, the liquid level of the well can reach the set value again, the state of the pilot valve is maintained continuously, and the vacuum valve is prevented from being opened and closed frequently in a short time period. Based on this, the present embodiment improves the pilot valve of the vacuum valve, and it is desirable that the pilot valve can realize the following functions: when the air pressure of the first accommodating cavity is increased, namely, the liquid level in the well is increased, the valve core can quickly respond and quickly switch states. In the process that the air pressure of the first container is increased, the valve core moves towards the direction of the second containing cavity, the second containing cavity exhausts air to the outside, the faster the exhaust speed of the second containing cavity is, the smaller the resistance of the second containing cavity to the movement of the valve core is, and the faster the forward movement speed of the valve core is. When the air pressure of the first cavity is reduced, namely the liquid level in the well is reduced, the valve core can move reversely, air can be supplied to the second cavity from the outside, and the slower the air inlet speed of the second cavity is, the slower the reverse movement speed of the valve core is. Based on this, the utility model provides a two-way flow control mechanism, two-way flow control mechanism make the pilot valve can exhaust fast, slowly admit air. The principle that the pilot valve can achieve fast exhaust and slow intake is further described in detail below with reference to an embodiment of a bidirectional flow control mechanism to support the technical problem to be solved by the embodiment.

Pilot valve embodiment one

As shown in fig. 3, the pilot valve comprises a valve body in which a membrane 11b is arranged, which membrane 11b divides a first volume 12 and a second volume 13 in the valve body. The cartridge includes a stem 21 and a sealing block 22. The end of the valve stem 21 remote from the sealing block 22 is connected to the membrane 11b, and the sealing block 22 is used for switching the pilot valve flow passage. A spring 14 is arranged in the second volume 13 of the pilot valve in connection with the valve stem 21. The pilot valve is further provided with a pilot port P1, the pilot port P1 being in communication with the first volume 12, external air pressure being introduced into the first volume 12 through the pilot port. When the air pressure in the first cavity 12 increases to a set value, the diaphragm 11b deforms toward the second cavity 13 under the action of the air pressure, and drives the valve core to move toward the second cavity, and at this time, the spring 14 is compressed. The second cavity of the pilot valve is provided with a bidirectional flow control mechanism. The bi-directional flow control mechanism is provided with an inlet port 311 and the inlet port 311 may be in communication with a second volume in the pilot valve. The bi-directional flow control mechanism is also provided with an air outlet 313, which 313 may be vented to atmosphere. A seal 312 is also arranged between the air inlet 311 and the air outlet 313, and the seal 312 is provided with a conical surface; a spherical end enclosure 3141 is adapted to the conical surface. Referring to fig. 1, when the air pressure of the first cavity increases and the deformation element moves towards the second cavity, the second cavity 13 starts to exhaust through the bidirectional flow control mechanism, and at this time, the spherical sealing head 3141 moves upwards under the action of the air pressure. When the air pressure of the first cavity is reduced and the second cavity 13 starts to admit air through the bidirectional flow control mechanism, the spherical sealing head 3141 moves downwards under the action of gravity, the closer the sealing head is to the seal, the smaller the overflow at the seal is, the more difficult the air is to be admitted, and the slower the air admission speed is.

In the embodiment of the pilot valve, the functions of quick exhaust and slow air intake of the pilot valve can be realized through the bidirectional flow control mechanism, so that the vacuum valve is applied to a well, and the following effects can be achieved: when the liquid level reaches a set value, the state of the pilot valve of the vacuum valve can be switched rapidly, so that the main valve rapidly establishes a negative pressure state, thereby rapidly pumping water and preventing water from overflowing out of the well. When the liquid level is lower than the set value, the pilot valve of the vacuum valve delays the switching state, so that the negative pressure state of the main valve is maintained, water can be pumped continuously when the liquid level in the well is lower than the set value, the liquid level of the well can reach the set value again before the pilot valve is not switched, the state of the pilot valve is maintained continuously, and the vacuum valve is prevented from being opened and closed frequently in a short time period.

Embodiment one of the bidirectional flow control mechanism

As shown in FIG. 4, the bi-directional flow control mechanism also provides an inlet 311 and an outlet 313, the inlet 311 being for communication with a pilot valve and the outlet 313 being communicable with the atmosphere. A seal 312 is also arranged between the air inlet 311 and the air outlet 313, and the seal 312 is provided with a conical surface; a spherical end enclosure 3141 is adapted to the conical surface. The farther the spherical end enclosure 3141 is from the seal, the greater the excess flow at the seal. The ball-shaped end enclosure 3141 has a smaller excess flow rate at the sealing position in the process of approaching the sealing position under the action of gravity. That is, the bidirectional flow rate may be different in this embodiment. In the prior art, only one-way flow control mechanisms are typically present. Or a bi-directional flow control mechanism is present, but the bi-directional flow control mechanism does not provide the following functions: the speed of the bi-directional flow is different. The seal of the bidirectional flow control mechanism provided by the utility model is provided with the conical surface, so that the gap between the seal head and the seal is larger and larger in the process that the seal head is far away from the seal, and the overflow of the seal is increased; in the process that the end socket moves towards the seal under the action of self weight, the gap between the end socket and the seal is smaller and smaller, and the overflowing quantity at the seal is reduced, so that the effect that the two-way overflowing speed can be different is achieved.

Two-way flow control mechanism embodiment two

As shown in fig. 5, compared to the first bidirectional flow control mechanism embodiment, in the second bidirectional flow control mechanism embodiment, the seal head of the bidirectional flow control mechanism is replaced with a tapered seal head 3142, and the tapered seal head 3142 is fitted with the tapered surface of the seal. The farther the conical end enclosure 3142 is from the seal, the greater the excess flow at the seal. The overflow at the seal is reduced as the conical seal head 3142 is closer to the seal under the action of gravity. That is, the bidirectional flow rate may be different in this embodiment.

It should be added that, in the first and/or second embodiments of the bidirectional flow control mechanism, the specific structure of the end socket and the specific material of the end socket are not specifically limited, as long as the end socket can be adapted to the seal and can move in the direction away from the seal when obtaining a small air pressure; under the action of gravity, the design of the seal head which can move towards the direction close to the seal is suitable for the utility model and is also within the protection range of the utility model; for example, the end socket can be designed into a sphere or a cone, the end socket can be made of rubber or metal, and the end socket can be of a solid structure or a hollow structure. Furthermore, the end socket is close to the seal under the action of self weight and directly contacts with the seal, the end socket and the seal do not have a completely sealed effect, a gap exists between the end socket and the seal, and the gap provides a slow air inlet channel for a second containing cavity in the pilot valve. Thus, the bi-directional flow control mechanism is not equivalent to a one-way valve. When the head of the bidirectional flow control mechanism is designed, the head also has the characteristics of small volume and light weight. So as to achieve the effects of simple structure, small size and high sensitivity to air pressure of the pilot valve.

Pilot valve embodiment two

As shown in fig. 6, the pilot valve comprises a valve body in which a membrane 11b is arranged, which membrane 11b divides a first volume 12 and a second volume 13 in the valve body. The cartridge includes a stem 21 and a sealing block 22. The end of the valve stem 21 remote from the sealing block 22 is connected to the membrane 11b, and the sealing block 22 is used for switching the pilot valve flow passage. A spring 14 is arranged in the second volume 13 of the pilot valve in connection with the valve stem 21. The pilot valve is further provided with a pilot port P1, the pilot port P1 being in communication with the first volume 12, external air pressure being introduced into the first volume 12 through the pilot port. When the air pressure in the first cavity 12 increases to a set value, the diaphragm 11b deforms toward the second cavity 13 under the action of the air pressure, and drives the valve core to move toward the second cavity, and at this time, the spring 14 is compressed. The second volume of the pilot valve is provided with a bidirectional flow control mechanism 31B. The bidirectional flow control mechanism comprises an air inlet and an air outlet which are communicated with the second cavity of the pilot valve; the air inlet is communicated with the second cavity of the pilot valve. A cover plate is arranged at the air outlet, and a vent hole is arranged on the cover plate and communicated with the air inlet; when the second cavity of the pilot valve exhausts, the cover plate opens the air outlet; when the second cavity of the pilot valve is used for air inlet, the cover plate closes the air outlet, and the vent hole in the cover plate provides an air inlet channel for the second cavity of the pilot valve.

The two-way flow control mechanism of the pilot valve embodiment two uses another design principle than the two-way flow control mechanism of the pilot valve embodiment one. In addition, the bidirectional flow control mechanism and the pilot valve in the second embodiment of the pilot valve can be of an integrated structure or a detachable structure. When the bi-directional flow control mechanism is a removable structure, one skilled in the art can connect to the pilot valve via other connectors, such as: screw type connection; another example is: and (4) plug-in connection.

Two-way flow control mechanism embodiment III

One embodiment of a bi-directional flow control mechanism in a second pilot valve embodiment is illustrated in figure 7. A bidirectional flow control mechanism comprises an air inlet, an air outlet and a cover plate. Wherein, the air outlet is provided with a conical surface; the rotating cover plate 3101a is rotatably coupled to the tapered surface. In this embodiment, the rotating cover 3101a is coupled to the upper end of the air outlet through a rotating shaft. The air outlet is arranged as a conical surface, and has the advantages that: when the rotary cover plate 3101a is opened by air pressure, it is attached to the air outlet by gravity. Because the air outlet is a conical surface, when the rotating cover plate 3101a is attached to the air outlet, the air outlet is pressed by the rotating cover plate, and therefore, the rotating cover plate 3101a and the air outlet can achieve a better sealing effect. Those skilled in the art can design the air outlet as a flush structure, and the rotating cover 3101a can be attached to the air outlet under the action of gravity, but the air outlet cannot be pressed by the rotating cover, so the sealing effect is not as good as that of the air outlet designed as a conical surface. The rotating cover plate 3101a is further provided with a vent hole 3102 communicating with the air inlet, and when the rotating cover plate 3101a is attached to the air outlet, the vent hole 3102 provides a small flow passage for the bidirectional flow control mechanism. When the cover plate moves forwards to open the air outlet, the cover plate provides forward overflow for the bidirectional flow control mechanism; when the cover plate moves reversely to close the air outlet, the vent hole on the cover plate provides reverse overflow for the bidirectional flow control mechanism. The third embodiment of the bidirectional flow control mechanism can realize the effects of high exhaust speed and low air intake speed for the pilot valve.

In this arrangement, the bidirectional flow control mechanism differs from the prior art check valve in that: the cover plate is provided with a vent hole. The check valve is one of the check valves, i.e., the check valve can only provide a one-way flow function. In this scheme, set up an air vent on the apron, not only reached the function of two-way flow, more importantly effect: the aperture of the vent hole is far smaller than that of the air outlet, the overflow of the vent hole is small, and the excess of the air outlet is large. That is, the bi-directional flow rates may be different.

Embodiment four of bidirectional flow control mechanism

Still another embodiment of the bidirectional flow control mechanism in the pilot valve embodiment two is illustrated in figure 8. A bidirectional flow control mechanism comprises an air inlet, an air outlet and a movable cover plate. Wherein the gas outlet is provided with fixed chamber, the one end in fixed chamber with the air inlet intercommunication, one end and atmosphere intercommunication, apron and the coaxial setting of first spring in fixed chamber, the apron is close to the one end of fixed chamber and air inlet intercommunication, first spring is close to the one end of fixed chamber and atmosphere intercommunication. Different from the rotating cover plate in the third embodiment of the bidirectional flow control mechanism. The moveable cover 3101b of the fourth embodiment of the bi-directional flow control mechanism is removably coupled to the outlet port, i.e., the moveable cover 3101b is not directly coupled to the outlet port, but is detachable therefrom. The air outlet is also provided with a fixed cavity communicated with the air inlet, and the movable cover plate 3101b and the first spring 3103 are arranged in the fixed cavity. When the movable cover 3101b is pressed, it moves forward against the elastic force of the first spring 3102, and the larger the pressure applied to the movable cover 3101b, the larger the amount of compression of the first spring 3103, and the larger the gap between the movable cover 3101b and the air outlet. When the pressure on the moveable cover 3101b is reduced, the first spring 3103 is restored to push the moveable cover 3101b to move reversely and make the cover 3101b fit the air outlet, and the vent 3102 on the moveable cover 31012 provides a smaller flow path. The fourth embodiment of the bidirectional flow control mechanism can also realize the effects of high exhaust speed and low air intake speed for the pilot valve.

In the third embodiment and/or the fourth embodiment of the bidirectional flow control mechanism, the bidirectional flow control mechanism is different from the check valve (one of the check valves) in the prior art in that: the cover plate is provided with a vent hole. The check valve is one of the check valves, i.e., the check valve can only provide a one-way flow function. In this scheme, set up an air vent on the apron, not only reached the function of two-way flow, more importantly effect: the aperture of the vent hole is far smaller than that of the air outlet, the overflow of the vent hole is small, and the excess of the air outlet is large. That is, the bi-directional flow rates may be different.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents or recombined without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (9)

1. A bi-directional flow control mechanism, comprising:

the air inlet is used for being communicated with a target to be controlled;

the air outlet is communicated with the atmosphere;

the seal is positioned between the air inlet and the air outlet and is provided with a conical surface;

the end socket is adapted to the conical surface of the seal; when the seal head is far away from the seal, the over-flow at the seal is increased; when the seal head is close to the seal, the overflowing amount at the seal is reduced.

2. A bi-directional flow control mechanism as recited in claim 1, comprising:

the end socket is a spherical body.

3. A bi-directional flow control mechanism as recited in claim 1, comprising:

the seal head is a conical body.

4. A bi-directional flow control mechanism as recited in claim 1, comprising:

the seal head is made of rubber materials.

5. A bi-directional flow control mechanism as recited in claim 1, comprising:

the seal head is made of metal materials.

6. A bi-directional flow control mechanism as recited in claim 1, comprising:

the seal head is of a hollow structure.

7. A bi-directional flow control mechanism, comprising:

the air inlet is used for being communicated with a target to be controlled;

the air outlet is communicated with the atmosphere;

the cover plate is connected to the air outlet and provided with an air vent communicated with the air inlet.

8. A bi-directional flow control mechanism as recited in claim 7, wherein:

the air outlet is provided with a conical surface, and the cover plate is rotatably connected to the conical surface.

9. A bi-directional flow control mechanism as recited in claim 7, wherein:

the gas outlet is provided with fixed chamber, wherein, the one end in fixed chamber with the air inlet intercommunication, one end and atmosphere intercommunication, apron and the coaxial setting of first spring in fixed chamber, the apron is close to the one end of fixed chamber and air inlet intercommunication, first spring is close to the one end of fixed chamber and atmosphere intercommunication.

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