Main valve of double-outlet pilot valve and pilot valve

Abstract

The utility model discloses a main valve of a double-outlet pilot valve and the pilot valve, and belongs to the technical field of valves, the main valve comprises a valve body, a fluid cavity channel arranged on the valve body and provided with an inlet, a first outlet and a second outlet, a valve rod and a valve core, the valve element is used for controlling the communicating state of the inlet and the first outlet and the communicating state of the inlet and the second outlet, the valve further comprises a piston cavity formed in the valve body, and a piston ring is installed on the valve rod. The valve body is provided with a second sealing face and a first sealing face, and the valve element is located between the second sealing face and the first sealing face. The second sealing surface, the first sealing surface and the piston cavity are sequentially arranged in the axis direction of the valve rod; the pilot valve further comprises a reset spring supported between the valve seat and the valve rod, the pilot valve comprises the main valve, and the main valve provided by the scheme can be kept in a specific opening state when an inlet is in a non-medium pressure state.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a dual-outlet pilot valve main valve and a pilot valve. Background Art

[0002] Taking electromagnetically driven valves as an example, for medium-pressure, high-pressure, and ultra-high-pressure pipelines, when the pressure of the medium in the pipeline on the valve disc is relatively large, a large pulling force or thrust is required to open the valve. At this time, the valve opening and closing can be achieved by increasing the power of the electromagnetic drive mechanism. The problems that follow are high energy consumption of the electromagnetic drive mechanism and prominent heating of the electromagnetic drive mechanism. To solve this problem, a pilot valve based on an electromagnetic drive mechanism is proposed in the prior art. The specific scheme is as follows: the pilot valve includes a main valve and an auxiliary valve (also referred to as a pilot valve or a pilot valve), the main valve serves as a control valve for the pipeline medium, and the auxiliary valve is provided with a main valve control pipeline. The specific working method is as follows: the electromagnetic drive mechanism only controls the opening and closing of the auxiliary valve, and the auxiliary valve adjusts the valve front medium in the main valve control pipeline under different opening and closing states to change the effect of the valve front medium on the main valve, and uses the medium in the main valve control pipeline to act on the valve core of the main valve to control the opening and closing state of the main valve. In this way, the opening and closing state of the valve requiring a large force for opening and closing adjustment can be controlled by using a relatively small-power electromagnetic drive mechanism.

[0003] In the prior art, the electromagnetically driven pilot valve used in the gas circuit includes the following structural forms: the main valve has a P pipe port, an E pipe port and an A pipe port, relative to the main valve, one of the pipe ports is used as an air inlet, and the other two pipe ports are used as exhaust ports, relative to the gas circuit, two of the pipe ports are used as connecting ports, and the other pipe port is used as an exhaust port. Taking the main valve as a reference, the electromagnetic drive mechanism changes the state of the pilot valve, and the state of the pilot valve determines the way the pilot valve acts on the main valve, so as to achieve the use of the pilot valve to control the conduction mode of the air inlet and each exhaust port on the main valve.

[0004] Pilot valves based on electromagnetic drive mechanisms are used in various fields. In order to meet the application requirements of different occasions, it is necessary to further optimize the relevant structure of the pilot valve. Utility Model Content

[0005] In view of the above-mentioned problem of further optimizing the pilot valve based on the electromagnetic drive mechanism, the utility model provides a dual-outlet pilot valve main valve and a pilot valve. The main valve provided by the scheme can maintain a specific open state when the inlet is in a state without medium pressure.

[0006] In view of the above problems, the present utility model provides a main valve of a dual - outlet pilot valve and a pilot valve to solve the problems through the following technical points: A main valve of a dual - outlet pilot valve includes a valve body and a fluid passage disposed on the valve body. The fluid passage has an inlet, a first outlet, and a second outlet. It also includes a valve stem disposed in the valve body and a valve core fixed to the valve stem. The valve core is used to control the conduction state between the inlet and the first outlet and the conduction state between the inlet and the second outlet. It further includes a piston chamber disposed in the valve body and located at the end of the valve stem. A piston ring is installed on the valve stem and is fitted in the piston chamber;

[0007] The valve body is provided with a second sealing surface and a first sealing surface arranged at intervals along the axial direction of the valve stem. The valve core is located between the second sealing surface and the first sealing surface. When the valve core moves with the valve stem and the valve core presses against the second sealing surface, the fluid passage between the inlet and the second outlet is cut off. When the valve core presses against the first sealing surface, the fluid passage between the inlet and the first outlet is cut off;

[0008] In the axial direction of the valve stem, the second sealing surface, the first sealing surface, and the piston chamber are arranged in sequence;

[0009] It also includes a return spring supported between the valve seat and the valve stem. When the piston ring pushes the valve stem to move the valve core to cooperate with the second sealing surface, the return spring undergoes compressive deformation, and the return spring is located on the side of the second sealing surface away from the first sealing surface.

[0010] In the prior art, the working principle of a pilot - operated solenoid valve or a pilot valve based on an electromagnetic drive mechanism is as follows: When the electromagnetic drive mechanism is energized, the constraint relationship between the pilot valve and the main valve is removed, and the main valve is opened under the action of the inlet medium pressure. The opening and closing state of the main valve is the medium conduction state. When the electromagnetic drive mechanism is de - energized, under the action of the spring force, the pilot valve restricts the internal pressure in the pressure chamber of the main valve. At this time, under the combined pressure of the inlet - side pressure, the outlet - side pressure, and the internal pressure in the pressure chamber of the main valve, the main valve is forced to close, and the opening and closing state of the main valve is the medium cut - off state. When there is no pressure medium at the inlet of the main valve, for the main valve, since there is no driving force to open the main valve, the fluid passage on the main valve can only remain in the cut - off state.

[0011] This solution aims to provide a dual - outlet pilot valve and a technical solution that can change the conduction state between the inlet and each outlet under the action of the pilot valve and open a specific outlet when there is no medium pressure at the inlet to meet the requirements of the opening and closing state of the pilot valve in related application scenarios.

[0012] In this solution, the valve body is the fixed component of the main valve, which provides the fluid channels on the main valve. The first sealing surface and the second sealing surface are located on the valve body and, by fitting with the valve core, truncate the fluid channels in the corresponding flow directions. The valve stem is installed in the valve body, and when the valve stem moves, the position of the valve core that moves with the valve stem changes, thereby changing the mating relationship with the first sealing surface and the second sealing surface. For example, when the horizontal valve stem moves to the left, the left side of the valve core fits with the second sealing surface located on the left side of the valve core. At this time, the valve core truncates the second outlet and the inlet, and the first outlet and the inlet are conducted. When the horizontal valve stem moves to the right, the right side of the valve core fits with the first sealing surface located on the right side of the valve core. At this time, the valve core truncates the first outlet and the inlet, and the second outlet and the inlet are conducted. The piston ring serves as the driving module for driving the valve stem movement. In the overall pilot valve, a pilot valve is configured for the main valve. The pilot valve is used to adjust the pressure in the piston chamber. Since the second sealing surface, the first sealing surface, and the piston chamber are arranged in sequence in the axial direction of the valve stem. For example, when the pressure in the piston chamber increases, the piston ring pushes the valve stem, causing the valve core to move towards the second sealing surface to obtain the state where the second outlet and the inlet are truncated and the first outlet and the inlet are conducted. When the internal pressure of the piston chamber does not affect the position of the valve stem, the return spring can generate an elastic restoring force that pushes the valve stem towards the side where the first sealing surface is located. At this time, according to needs, it can be adjusted so that the valve core fits with the first sealing surface. At this time, the inlet and the second outlet are conducted, the inlet and the first outlet are truncated, or the valve core is located between the first sealing surface and the second sealing surface. At this time, the inlet is conducted with both the first outlet and the second outlet.

[0013] This solution proposes a technical solution for setting a return spring between the valve stem and the valve body for the application of the main valve with two outlets. When the internal pressure of the piston chamber acts on the piston ring and pushes the valve stem to move, the return spring stores energy, and the main valve is adjusted to the state where the inlet and the first outlet are conducted and the second outlet is truncated. When the pressure in the piston chamber does not affect the movement of the valve stem, according to the pressure settings of the return spring, the inlet, the first outlet, and the second outlet, the valve core can be located at any of the following three positions: the position where it fits with the second sealing surface, the position where it does not fit with either the second sealing surface or the first sealing surface, and the position where it fits with the first sealing surface. When the medium pressure of the inlet, the first outlet, and the second outlet is lost, through the action of the return spring, the state where the inlet and the second outlet are conducted is maintained.

[0014] In summary, the structural design adopted in this solution provides a structural basis for setting the opening states of the pilot valve main valve under different applications and working conditions, and provides a main valve structure that can be adjusted to have multiple opening modes. At the same time, the main valve provided by this solution can not only be used for medium diversion transportation, but also, when there is no medium pressure at the inlet, it can maintain a specific opening state. In this opening state, the second outlet can be used for operations such as emptying before closing the medium pipeline, detecting the position of the valve stem, and taking pressure using the second outlet to determine the medium state at the inlet.

[0015] In this solution, the normal state of the main valve can be that the inlet is truncated from the second outlet and conducted with the first outlet. By setting the return spring on the side of the second sealing surface away from the first sealing surface, it can effectively avoid the influence of fluid flow disturbing the return spring in this case on the stability of the valve stem.

[0016] As a further technical solution of the double-outlet pilot valve main valve:

[0017] As introduced above, as a person skilled in the art, in this solution, the return spring is used as an energy storage element. For the valve stem, its action mode and staying position are determined by the acting force of the corresponding position of the flow channel cavity on the valve core, the action of the pressure in the piston cavity on the piston ring, and the acting force of the return spring on the valve stem. In specific applications, the pressure at the inlet, the pressures at the second outlet and the third outlet vary with different usage scenarios. To adjust the various states of the main valve according to specific usage scenarios, the following provides a structural form of the valve body and proposes a technical solution that can replace the return spring with different parameters according to the usage scenario. Specifically: The valve body includes an outer shell, and the outer shell is a shell structure provided with a blind hole. The blind hole is a stepped hole, and the diameter of the stepped hole decreases from the open end to the bottom end of the stepped hole.

[0018] The piston cavity is located at the bottom end of the blind hole.

[0019] The valve body further includes an embedded component detachably connected to the blind hole.

[0020] From the open end to the bottom end of the blind hole, the embedded component includes a first seat body and a second seat body arranged in sequence.

[0021] The inner end of the second seat body is positioned on the step surface of the stepped hole, the outer end of the second seat body is pressed against the inner end of the first seat body, and the second seat body is detachably connected to the outer shell.

[0022] A cavity communicating with the inlet is provided on the second seat body. The valve stem passes through the second seat body through the cavity and is embedded in the central hole of the first seat body. One end of the return spring is embedded in the central hole of the first seat body and supported in the central hole, and the other end of the return spring is supported on the convex platform of the valve stem.

[0023] The flow channel cavity between the inlet and the first outlet includes the cavity. The first sealing surface is a stepped surface on the cavity and is located inside the inner end of the second seat body. The flow channel cavity between the inlet and the second outlet includes the cavity and the central hole on the first seat body. The second sealing surface is the inner end face of the first seat body.

[0024] In the above solution, it is a blind hole in the shape of a stepped hole with a large outer and a small inner diameter, which is convenient for the dimensional design and installation design of each component of the embedded part. In the embedded part, the inner end of the second seat body is positioned by the outer shell body, and the outer end is positioned by the first seat body, that is, the position of the embedded part in the blind hole is defined by the detachable first seat body; the outer end of the valve stem is supported on the embedded part, and the inner end is supported in the piston cavity; the second sealing ring is formed on the inner end face of the first seat body, and the first sealing surface is formed inside the inner end of the second seat body, that is, the valve core is limited between the inner end face of the first seat body and the inner side surface of the inner end of the second seat body. For convenience of preparation and installation, the cavity on the second seat body is a stepped hole, and the end of the stepped hole facing the first seat body is the large end, and the end of the stepped hole facing the piston cavity is the small end. In this way, the first sealing surface is the stepped surface of the cavity, and the valve stem has a clearance fit with the small end of the cavity to form a channel connecting the first outlet and the inlet; the central hole of the first seat body is used to accommodate the return spring and is used as a component of the flow channel cavity between the inlet and the second outlet.

[0025] The above solution provides a valve body with a split structure. Specifically, the first outlet, the second outlet, and the inlet are formed on the outer shell body, and the corresponding sealing surfaces are formed on the parts of the embedded part, and the embedded part itself is a split design, which is not only convenient for the processing of the first sealing surface and the second sealing surface, but also convenient for the assembly of the valve core and the valve body.

[0026] After the different ends of the valve core are attached to the first sealing surface and the second sealing surface, for the fluid channel in the valve body, under the influence of the medium parameters of the inlet, the first outlet, and the second outlet, there may be a large pressure difference in different paragraphs. To avoid leakage between the outer shell body and the embedded part affecting the cut-off performance of the main valve, it is set that: sealing rings are provided between the first seat body and the outer shell body and between the second seat body and the outer shell body. The sealing ring between the first seat body and the outer shell body is used to: when the valve core is attached to the second sealing surface, avoid the pressure difference between the inlet and the second outlet from causing the medium to leak from the gap between the first seat body and the outer shell body to the second outlet. The sealing ring between the second seat body and the outer shell body is used to: when the valve core is attached to the first sealing surface, avoid the pressure difference between the inlet and the first outlet from causing the medium to leak from the gap between the second seat body and the outer shell body to the first outlet.

[0027] As described above, the first seat body needs to exert a pressing effect on the second seat body and realize its positioning on the outer shell through the second seat body. As a technical solution with a simple structure, the outer end of the first seat body is threadedly connected to the outer shell. As a technician in this field, other solutions also include technical solutions using screw connections.

[0028] In the above scheme, the second seat body has the need for conduction on both sides, and the first seat body has the need for closing the outer end. To facilitate the layout of the channels on the first seat body, the channels on the first seat body meet the conduction needs of the inlet and the second outlet when the first seat body is rotated to any angle, and it is set as follows: the outer side of the first seat body is provided with an annular groove around the outer periphery of the first seat body, the annular groove is in conduction with the second outlet, and the center hole is in conduction with the annular groove through the radial hole provided on the first seat body. In this scheme, the radial hole conducts the center hole and the annular groove, and the conduction relationship between the annular groove and the second outlet is not affected when the first seat body is rotated to any angle.

[0029] The reset spring is supported on the stepped surface of the center hole, and the center hole also includes a guide hole section located outside the reset spring, and the outer end of the valve stem is embedded in the guide hole section. This solution provides a specific matching form of the valve stem and the first seat body: the reset spring can be a spiral compression spring sleeved on the valve stem, and the center hole not only plays the function of installing the reset spring, but also plays the function of directly supporting the valve stem. This solution has a compact structure and can improve the stability of the valve stem under the action of fluid by providing outer end support for the valve stem.

[0030] The piston ring comprises a support plate arranged on the valve stem and a sealing ring supported on the support plate, and the outer side of the sealing ring contacts the cavity wall of the piston cavity;

[0031] The sealing ring is also provided with an annular groove on one side close to the bottom of the blind hole, the annular groove is coaxial with the valve stem, and is a V-shaped groove with a width on the notch side greater than a width on the groove bottom side;

[0032] It also includes an outlet end located in the piston cavity, and a medium inlet hole whose outlet end is located on the side of the sealing ring close to the bottom of the blind hole. This solution provides a specific implementation method of the piston ring, and the support plate can be integrally formed at the end of the valve stem. When the piston ring moves, the support plate provides support for the sealing ring to achieve force transmission between the sealing ring and the valve stem. Different from the prior art, this solution provides an annular groove with a V-groove cross-section and facing the piston cavity. In this way, during the process of increasing pressure in the piston cavity, the characteristic of the annular groove that can be opened is used to ensure the contact pressure between the sealing ring and the piston cavity wall, thereby ensuring the effectiveness of the piston ring on the valve stem.

[0033] The piston ring comprises a support plate arranged on the valve stem and a sealing ring supported on the support plate, and the outer side of the sealing ring contacts the cavity wall of the piston cavity;

[0034] On one side of the sealing ring close to the bottom of the blind hole, there is also a shaft circlip fixed on the valve stem, and the sealing ring is clamped between the support disc and the shaft circlip. This solution provides a specific installation method for the sealing ring. During specific installation, the sealing ring is sleeved onto the valve stem from the end of the valve stem and slides until it contacts the support disc, and then the shaft circlip is used to restrict the sealing ring from retreating, that is, a simple-structured and reliable-constraint fixing solution for the sealing ring is provided.

[0035] This solution also relates to a pilot valve, including a main valve, and the main valve is the main valve provided in any one of the above. This solution is the specific application of the main valve on the pilot valve.

[0036] For this pilot valve, more completely, it also includes a pilot valve for adjusting the internal pressure in the piston chamber and an electromagnetic driving mechanism for adjusting the state of the pilot valve; the pilot valve has a pressure tapping hole communicated with the inlet.

[0037] The utility model has the following beneficial effects:

[0038] The structural design adopted in the solution provides a structural basis for setting the opening state of the main valve of the pilot valve under different applications and working conditions, and provides a main valve structure that can be adjusted to have multiple opening modes; at the same time, the main valve provided in this solution can not only be used for medium shunt transportation, but also can maintain a specific opening state when there is no medium pressure at the inlet. Description of the Drawings

[0039] Figure 1 It is a bottom view of a specific embodiment of the pilot valve described in this solution;

[0040] Figure 2 It is a side view of a specific embodiment of the pilot valve described in this solution;

[0041] Figure 3 It is Figure 2 A cross-sectional view obtained by cutting the shown structure along the A-A orientation;

[0042] Figure 4 It is a front view of a specific embodiment of the pilot valve described in this solution;

[0043] Figure 5 It is Figure 4 A cross-sectional view obtained by cutting the shown structure along the B-B orientation.

[0044] The reference numerals in the figures are respectively: 1. First outlet, 2. Second outlet, 3. Inlet, 4. Piston ring, 5. Piston chamber, 6. Second sealing surface, 7. First sealing surface, 8. Valve stem, 9. Outer housing, 10. Valve core, 11. Return spring, 12. Embedded component, 13. First seat body, 14. Second seat body, 15. Electromagnetic drive mechanism, 16. Pilot valve, 17. Main valve, 18. Guide hole section. 19. Ring groove, 20. Circlip for shaft. Detailed implementation manners

[0045] The following further elaborates on the present utility model in conjunction with embodiments, but the present utility model is not limited to the following embodiments:

[0046] Embodiment 1:

[0047] As Figures 1 to 5 shown, a double - outlet pilot - operated main valve includes a valve body and a fluid passage disposed on the valve body. The fluid passage has an inlet 3, a first outlet 1, and a second outlet 2. It further includes a valve stem 8 disposed in the valve body and a valve core 10 fixed to the valve stem 8. The valve core 10 is used to control the on - off state between the inlet 3 and the first outlet 1 and the on - off state between the inlet 3 and the second outlet 2. It also includes a piston chamber 5 disposed in the valve body and located at the end of the valve stem 8. A piston ring 4 is installed on the valve stem 8 and is fitted in the piston chamber 5;

[0048] The valve body is provided with a second sealing surface 6 and a first sealing surface 7 arranged at intervals along the axis direction of the valve stem 8. The valve core 10 is located between the second sealing surface 6 and the first sealing surface 7. When the valve core 10 moves with the valve stem 8 and the valve core 10 presses against the second sealing surface 6, the fluid passage between the inlet 3 and the second outlet 2 is cut off. When the valve core 10 presses against the first sealing surface 7, the fluid passage between the inlet 3 and the first outlet 1 is cut off;

[0049] In the axis direction of the valve stem 8, the second sealing surface 6, the first sealing surface 7, and the piston chamber 5 are arranged in sequence;

[0050] It further includes a return spring 11 supported between the valve seat and the valve stem 8. When the piston ring 4 pushes the valve stem 8 to move the valve core 10 to cooperate with the second sealing surface 6, the return spring 11 undergoes compressive deformation, and the return spring 11 is located on the side of the second sealing surface 6 away from the first sealing surface 7.

[0051] In the prior art, the working principle of a pilot-operated solenoid valve or a pilot valve based on an electromagnetic driving mechanism 15 is as follows: when the electromagnetic driving mechanism 15 is energized, the constraint relationship between the pilot valve 16 and the main valve 17 is removed, and the main valve 17 is opened under the action of the medium pressure at the inlet 3. The opening and closing state of the main valve 17 is the medium-conducting state; when the electromagnetic driving mechanism 15 is de-energized, under the action of the spring force, the pilot valve 16 is in a state of constraining the internal pressure in the pressure chamber of the main valve 17. At this time, under the combined pressure of the pressure on the inlet 3 side, the pressure on the outlet side, and the internal pressure in the pressure chamber of the main valve 17, the main valve 17 is forced to close, and the opening and closing state of the main valve 17 is the medium-cutoff state. When there is no pressure medium at the inlet 3 of the main valve 17, for the main valve 17, since there is no driving force to drive the main valve 17 to open, the fluid channel on the main valve 17 can only maintain the cutoff state.

[0052] This solution aims to provide a double-outlet pilot valve and a technical solution that can change the conduction state between the inlet 3 and each outlet under the action of the pilot valve 16, and can open a specific outlet when there is no medium pressure at the inlet 3, so as to meet the requirements of the opening and closing state of the pilot valve in relevant application scenarios.

[0053] In this solution, the valve body is the fixed component of the main valve 17, which provides the fluid channels on the main valve 17. The first sealing surface 7 and the second sealing surface 6 are located on the valve body and are sealing surfaces that cut off the corresponding fluid channels by fitting with the valve core 10. The valve stem 8 is installed in the valve body. When the valve stem 8 moves, the position of the valve core 10 that moves with the valve stem 8 changes, thereby changing the cooperation relationship with the first sealing surface 7 and the second sealing surface 6. For example, when the horizontal valve stem 8 moves to the left, the left side of the valve core 10 fits with the second sealing surface 6 located on the left side of the valve core 10. At this time, the valve core 10 cuts off the second outlet 2 and the inlet 3, and the first outlet 1 and the inlet 3 are conducted. When the horizontal valve stem 8 moves to the right, the right side of the valve core 10 fits with the first sealing surface 7 located on the right side of the valve core 10. At this time, the valve core 10 cuts off the first outlet 1 and the inlet 3, and the second outlet 2 and the inlet 3 are conducted. The piston ring 4 is used as a driving module for driving the valve stem 8 to move. In the overall pilot valve, a pilot valve 16 is configured for the main valve 17. The pilot valve 16 is used to adjust the pressure in the piston chamber 5. Since the second sealing surface 6, the first sealing surface 7, and the piston chamber 5 are arranged in sequence in the axial direction of the valve stem 8. For example, when the internal pressure in the piston chamber 5 increases, the piston ring 4 pushes the valve stem 8, causing the valve core 10 to move towards the second sealing surface 6 to obtain a state where the second outlet 2 and the inlet 3 are cut off and the first outlet 1 and the inlet 3 are conducted. When the internal pressure of the piston chamber 5 does not affect the position of the valve stem 8, the return spring 11 can generate an elastic restoring force that pushes the valve stem 8 towards the side where the first sealing surface 7 is located. At this time, according to needs, it can be adjusted so that the valve core 10 fits with the first sealing surface 7. At this time, the inlet 3 and the second outlet 2 are conducted, and the inlet 3 and the first outlet 1 are cut off, or the valve core 10 is located between the first sealing surface 7 and the second sealing surface 6. At this time, the inlet 3 is conducted with both the first outlet 1 and the second outlet 2.

[0054] This solution proposes a technical solution of setting a return spring 11 between the valve stem 8 and the valve body for the application of the main valve 17 with two outlets. When the internal pressure of the piston chamber 5 acts on the piston ring 4 and pushes the valve stem 8 to move, the return spring 11 stores energy, and the main valve 17 is adjusted to a state where the inlet 3 and the first outlet 1 are conducted and the second outlet 2 is cut off. When the pressure in the piston chamber 5 does not affect the movement of the valve stem 8, according to the pressure settings of the return spring 11, the inlet 3, the first outlet 1, and the second outlet 2, the valve core 10 can be located at any of the following three positions: the position where it fits with the second sealing surface 6, the position where it does not fit with either the second sealing surface 6 or the first sealing surface 7, and the position where it fits with the first sealing surface 7. When the medium pressure of the inlet 3, the first outlet 1, and the second outlet 2 is lost, through the action of the return spring 11, the state where the inlet 3 and the second outlet 2 are conducted is maintained.

[0055] In summary, the structural design adopted in this solution provides a structural basis for setting the opening states of the pilot valve main valve 17 under different applications and working conditions, and provides a main valve 17 structure that can be adjusted to have multiple opening modes. At the same time, the main valve 17 provided by this solution can not only be used for medium shunt transportation, but also, when there is no medium pressure at the inlet 3, it can maintain a specific opening state. In this opening state, the second outlet 2 can be used for operations such as emptying before closing the medium pipeline, detecting the position of the valve stem 8, and taking pressure using the second outlet 2 to determine the medium state at the inlet 3, etc.

[0056] In this solution, the normal state of the main valve 17 can be that the inlet 3 is truncated from the second outlet 2 and conducted with the first outlet 1. The return spring 11 is arranged on the side of the second sealing surface 6 away from the first sealing surface 7, which can effectively avoid the influence of fluid flow disturbing the return spring 11 on the stability of the valve stem 8 in this case.

[0057] Embodiment 2:

[0058] This embodiment is further refined on the basis of Embodiment 1:

[0059] As introduced above, as a person skilled in the art, in this solution, the return spring 11 is used as an energy storage element. For the valve stem 8, its action mode and staying position are determined by the acting force of the corresponding position of the flow channel cavity on the valve core 10, the action of the internal pressure in the piston cavity 5 on the piston ring 4, and the acting force of the return spring 11 on the valve stem 8. In specific applications, the pressures at the inlet 3, the second outlet 2, and the third outlet vary with different usage scenarios. To adjust the various states of the main valve 17 according to specific usage scenarios, the following provides a structural form of the valve body and proposes a technical solution that can replace the return spring 11 with different parameters according to the usage scenario. Specifically: The valve body includes an outer housing 9, and the outer housing 9 is a housing structure provided with a blind hole. This blind hole is a stepped hole, and from the open end to the bottom end of the stepped hole, the diameter of the stepped hole becomes smaller from large;

[0060] The piston cavity 5 is located at the bottom end of the blind hole;

[0061] The valve body further includes an embedded component 12 detachably connected to the blind hole;

[0062] From the open end to the bottom end of the blind hole, the embedded component 12 includes a first seat body 13 and a second seat body 14 arranged in sequence;

[0063] The inner end of the second seat body 14 is positioned on the step surface of the stepped hole, the outer end of the second seat body 14 is pressed against the inner end of the first seat body 13, and the second seat body 14 is detachably connected to the outer housing 9;

[0064] A cavity communicating with the inlet 3 is provided on the second body 14. The valve stem 8 passes through the second body 14 through the cavity and is embedded in the central hole of the first body 13. One end of the return spring 11 is embedded in the central hole of the first body 13 and supported in the central hole, and the other end of the return spring 11 is supported on the boss of the valve stem 8;

[0065] The flow channel cavity between the inlet 3 and the first outlet 1 includes the cavity. The first sealing surface 7 is a stepped surface on the cavity and is located inside the inner end of the second body 14. The flow channel cavity between the inlet 3 and the second outlet 2 includes the cavity and the central hole on the first body 13. The second sealing surface 6 is the inner end surface of the first body 13.

[0066] In the above solution, it is a blind hole in the form of a stepped hole with a large outer and a small inner diameter, which is convenient for the dimensional design and installation design of each component of the embedded component 12. In the embedded component 12, the inner end of the second body 14 is positioned by the outer housing 9, and the outer end is positioned by the first body 13, that is, the position of the embedded component 12 in the blind hole is defined by the detachable first body 13; the outer end of the valve stem 8 is supported on the embedded component 12, and the inner end is supported in the piston chamber 5; the second sealing ring is formed on the inner end surface of the first body 13, and the first sealing surface 7 is formed inside the inner end of the second body 14, that is, the valve core 10 is defined between the inner end surface of the first body 13 and the inner side surface of the inner end of the second body 14. For convenience of preparation and installation, the cavity on the second body 14 is a stepped hole, and the end of the stepped hole facing the first body 13 is the large end, and the end of the stepped hole facing the piston chamber 5 is the small end. In this way, the first sealing surface 7 is the stepped surface of the cavity, and the valve stem 8 is in clearance fit with the small end of the cavity to form a channel connecting the first outlet 1 and the inlet 3; the central hole of the first body 13 is used to accommodate the return spring 11 and is used as a component of the flow channel cavity between the inlet 3 and the second outlet 2.

[0067] The above solution provides a valve body with a split structure. Specifically, the first outlet 1, the second outlet 2, and the inlet 3 are formed on the outer housing 9, and the corresponding sealing surfaces are formed on the parts of the embedded component 12. Moreover, the embedded component 12 itself is a split design, which is not only convenient for the processing of the first sealing surface 7 and the second sealing surface 6, but also convenient for the assembly of the valve core 10 and the valve body.

[0068] Embodiment 3:

[0069] This embodiment is further refined on the basis of Embodiment 2:

[0070] After different ends of the valve core 10 are in contact with the first sealing surface 7 and the second sealing surface 6, for the fluid cavity in the valve body, under the influence of the medium parameters of the inlet 3, the first outlet 1 and the second outlet 2, there is a possibility that different sections have a large pressure difference. In order to avoid leakage between the outer shell 9 and the embedded component 12 affecting the cut-off performance of the main valve 17, it is configured as follows: sealing rings are provided between the first seat body 13 and the outer shell 9 and between the second seat body 14 and the outer shell 9. The sealing ring between the first seat body 13 and the outer shell 9 is used to: when the valve core 10 is in contact with the second sealing surface 6, avoid the pressure difference between the inlet 3 and the second outlet 2, causing the medium to leak from the gap between the first seat body 13 and the outer shell 9 to the second outlet 2; the sealing ring between the second seat body 14 and the outer shell 9 is used to: when the valve core 10 is in contact with the first sealing surface 7, avoid the pressure difference between the inlet 3 and the first outlet 1, causing the medium to leak from the gap between the second seat body 14 and the outer shell 9 to the first outlet 1.

[0071] As described above, the first seat body 13 needs to exert a pressing effect on the second seat body 14 and realize its positioning on the outer shell 9 through the second seat body 14. As a technical solution with a simple structure, the outer end of the first seat body 13 is threadedly connected to the outer shell 9. As a technician in this field, other solutions also include technical solutions using screw connections.

[0072] Embodiment 4:

[0073] This embodiment is further refined on the basis of Embodiment 3:

[0074] In the above scheme, the second seat body 14 has the need for conduction on both sides, and the first seat body 13 has the need for closing the outer end. To facilitate the layout of the channels on the first seat body 13, when the first seat body 13 is rotated to any angle, the channels on it meet the conduction needs of the inlet 3 and the second outlet 2, and it is set as follows: the outer side of the first seat body 13 is provided with an annular groove 19 around the outer circumference of the first seat body 13, the annular groove 19 is in conduction with the second outlet 2, and the center hole is in conduction with the annular groove 19 through the radial holes provided on the first seat body 13. In this scheme, the radial holes conduct the center hole and the annular groove, and the conduction relationship between the annular groove and the second outlet 2 is not affected when the first seat body 13 is rotated to any angle.

[0075] Embodiment 5:

[0076] This embodiment is further refined on the basis of Embodiment 2:

[0077] The return spring 11 is supported on the stepped surface of the central hole. The central hole further includes a guiding hole section 18 located outside the return spring 11, and the outer end of the valve stem 8 is embedded in the guiding hole section 18. This solution provides a specific form of cooperation between the valve stem 8 and the first seat body 13: the return spring 11 can be a helical compression spring sleeved on the valve stem 8. The central hole not only functions as the installation of the return spring 11, but also directly supports the valve stem 8. This solution has a compact structure, and by providing an outer end support for the valve stem 8, the stability of the valve stem 8 under the action of fluid can be improved.

[0078] Embodiment 6:

[0079] This embodiment is further refined on the basis of Embodiment 1:

[0080] The piston ring 4 includes a support disk arranged on the valve stem 8 and a sealing ring supported on the support disk. The outer side of the sealing ring is in contact with the wall of the piston chamber 5;

[0081] On the side of the sealing ring close to the bottom of the blind hole, a ring groove is further provided. The ring groove is coaxial with the valve stem 8, and the ring groove is a V-shaped groove with a width of the notch side greater than that of the bottom side;

[0082] It further includes a medium inlet hole with an outlet end located in the piston chamber 5 and the outlet end located on the side of the sealing ring close to the bottom of the blind hole. This solution provides a specific implementation of the piston ring 4. The support disk can be integrally formed at the end of the valve stem 8. When the piston ring 4 moves, the support disk provides support for the sealing ring to realize the force transmission between the sealing ring and the valve stem 8. Different from the prior art, this solution provides a ring groove with a V-shaped cross-section facing the piston chamber 5. In this way, during the process of increasing the pressure in the piston chamber 5, the characteristic that the ring groove can open is utilized to ensure the contact pressure between the sealing ring and the wall of the piston chamber 5, thereby ensuring the effectiveness of the action of the piston ring 4 on the valve stem 8.

[0083] Embodiment 7:

[0084] This embodiment is further refined on the basis of Embodiment 1:

[0085] The piston ring 4 includes a support disk arranged on the valve stem 8 and a sealing ring supported on the support disk. The outer side of the sealing ring is in contact with the wall of the piston chamber 5;

[0086] On one side of the sealing ring close to the bottom of the blind hole, there is also a shaft retaining ring 20 fixed on the valve stem 8, and the sealing ring is clamped between the support disc and the shaft retaining ring 20. This solution provides a specific installation method for the sealing ring. During specific installation, the sealing ring is sleeved onto the valve stem 8 from the end of the valve stem 8 and slides until it contacts the support disc, and then the shaft retaining ring 20 is used to restrict the sealing ring from retracting, that is, a sealing ring fixing solution with a simple structure and reliable restraint is provided.

[0087] Embodiment 8:

[0088] This embodiment is the specific application of the main valve 17 in the above embodiments:

[0089] This embodiment relates to a pilot valve, including a main valve 17, and the main valve 17 is the main valve 17 provided in any one of the above embodiments. This solution is the specific application of the main valve 17 on the pilot valve.

[0090] For this pilot valve, more completely, it further includes a pilot valve 16 for adjusting the internal pressure in the piston chamber 5 and an electromagnetic driving mechanism 15 for adjusting the state of the pilot valve 16; the pilot valve 16 has a pressure tapping hole communicating with the inlet 3.

[0091] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present invention are only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, other embodiments obtained without departing from the technical solution of the present invention should all be included within the protection scope of the present invention.

Claims

1. A dual-outlet pilot valve main valve, comprising a valve body, a fluid cavity arranged on the valve body, the fluid cavity having an inlet (3), a first outlet (1) and a second outlet (2), and further comprising a valve stem (8) arranged in the valve body and a valve core (10) fixed on the valve stem (8), the valve core (10) being used to control the conduction state between the inlet (3) and the first outlet (1) and the conduction state between the inlet (3) and the second outlet (2), characterized in that: It also includes a piston chamber (5) arranged in the valve body and located at the end of a valve stem (8), and a piston ring (4) matched with the piston chamber (5) is installed on the valve stem (8); The valve body is provided with a second sealing surface (6) and a first sealing surface (7) arranged at intervals along the axial direction of the valve stem (8); the valve core (10) is located between the second sealing surface (6) and the first sealing surface (7); when the valve core (10) moves with the valve stem (8) and when the valve core (10) is pressed against the second sealing surface (6), the fluid cavity between the inlet (3) and the second outlet (2) is cut off; when the valve core (10) is pressed against the first sealing surface (7), the fluid cavity between the inlet (3) and the first outlet (1) is cut off; In the axial direction of the valve stem (8), the second sealing surface (6), the first sealing surface (7) and the piston chamber (5) are arranged in sequence; The valve seat (4) further comprises a return spring (11) supported between the valve seat and the valve stem (8). When the piston ring (4) pushes the valve stem (8) to move the valve core (10) to cooperate with the second sealing surface (6), the return spring (11) is compressed and deformed, and the return spring (11) is located on the side of the second sealing surface (6) away from the first sealing surface (7).

2. A dual-outlet pilot valve main valve according to claim 1, characterized in that: The valve body comprises an outer shell (9), wherein the outer shell (9) is a shell structure provided with a blind hole, wherein the blind hole is a stepped hole, and the diameter of the stepped hole decreases from the opening end to the bottom end of the stepped hole; The piston chamber (5) is located at the bottom end of the blind hole; The valve body further comprises an embedded component (12) detachably connected to the blind hole; From the opening end to the bottom end of the blind hole, the embedded component (12) comprises a first seat body (13) and a second seat body (14) arranged in sequence; The inner end of the second seat body (14) is positioned on the step surface of the step hole, the outer end of the second seat body (14) and the inner end of the first seat body (13) are pressed against each other, and the second seat body (14) and the outer shell (9) are detachably connected; The second seat body (14) is provided with a cavity communicating with the inlet (3); the valve stem (8) passes through the second seat body (14) through the cavity and is embedded in the center hole of the first seat body (13); one end of the return spring (11) is embedded in the center hole of the first seat body (13) and supported in the center hole; the other end of the return spring (11) is supported on the boss of the valve stem (8); The flow channel cavity between the inlet (3) and the first outlet (1) includes the cavity, the first sealing surface (7) is a step surface on the cavity and is located on the inner side of the inner end of the second seat body (14), the flow channel cavity between the inlet and the second outlet (2) includes the cavity and the center hole on the first seat body (13), and the second sealing surface (6) is the inner end surface of the first seat body (13).

3. A dual-outlet pilot valve main valve according to claim 2, characterized in that: A sealing ring is provided between the first seat body (13) and the outer shell (9), and between the second seat body (14) and the outer shell (9); The outer end of the first seat body (13) is threadedly connected to the outer shell (9).

4. A dual-outlet pilot valve main valve according to claim 3, characterized in that: An annular groove (19) is arranged on the outer side of the first seat body (13) around the outer circumference of the first seat body (13); the annular groove (19) is connected to the second outlet (2); and the center hole is connected to the annular groove (19) via a radial hole arranged on the first seat body (13).

5. A dual-outlet pilot valve main valve according to claim 2, characterized in that: The return spring (11) is supported on the step surface of the center hole. The center hole also includes a guide hole section (18) located outside the return spring (11), and the outer end of the valve stem (8) is embedded in the guide hole section (18).

6. A dual-outlet pilot valve main valve according to any one of claims 1 to 5, characterized in that: The piston ring (4) comprises a support plate arranged on the valve stem (8) and a sealing ring supported on the support plate, wherein the outer side of the sealing ring contacts the cavity wall of the piston cavity (5); The sealing ring is also provided with an annular groove on one side close to the bottom of the blind hole, the annular groove is coaxial with the valve stem (8), and is a V-shaped groove with a width on the groove opening side greater than a width on the groove bottom side; It also includes a medium introduction hole with an outlet end located in the piston cavity (5), and the outlet end is located on a side of the sealing ring close to the bottom of the blind hole.

7. A dual-outlet pilot valve main valve according to any one of claims 1 to 5, characterized in that: The piston ring (4) comprises a support plate arranged on the valve stem (8) and a sealing ring supported on the support plate, wherein the outer side of the sealing ring contacts the cavity wall of the piston cavity (5); A shaft elastic circlip (20) fixed on the valve stem (8) is also provided on one side of the sealing ring close to the bottom of the blind hole, and the sealing ring is clamped between the support plate and the shaft elastic circlip (20).

8. A pilot valve, comprising a main valve (17), characterized in that: The main valve (17) is the main valve provided in any one of claims 1 to 7.

9. A pilot valve according to claim 8, characterized in that: It also includes a pilot valve (16) for adjusting the internal pressure in the piston chamber (5) and an electromagnetic drive mechanism (15) for adjusting the state of the pilot valve (16).

10. The pilot valve according to claim 9, characterized in that: The pilot valve (16) has a pressure-taking hole communicating with the inlet (3).

Images