A valve with soft start

Abstract

The present invention discloses a valve with soft start, which relates to the technical field of valve structures. The main structures include a valve body, a valve plate, a valve core and a cylinder shaft; the top of the valve plate is connected to the bottom of the hollow shaft; the cylinder housing is arranged at the top of the valve body; the top of the hollow shaft extends into the cylinder housing; the main spring is arranged between the valve plate and the cylinder housing; a soft start port is arranged at the bottom of the valve plate, and a pressure balance channel is arranged at the side of the valve plate; the cylinder shaft penetrates through the hollow shaft and the valve plate; the top of the cylinder shaft is connected to the valve core; the soft start spring is arranged between the valve plate and the hollow shaft; the side wall of the valve core is in dynamic sealing connection with the inner wall of the cylinder housing; the cylinder housing is provided with an upper ventilation interface and a lower ventilation interface. In the valve with soft start of the present invention, by arranging a pressure balance channel at the side of the valve plate, the compressed air is used to first open the pressure balance channel to reduce the pressure difference between the inlet and the outlet, and then the valve plate is opened to reduce the opening difficulty of the valve plate.

Description

Technical Field

[0001] The present invention relates to the technical field of valve structures, and particularly to a valve with soft start. Background Art

[0002] The working principle of a baffle valve is that the valve plate moves up and down through the valve stem to achieve sealing. The driving components for driving the valve stem include manual, manual-electric dual-action, pneumatic, etc. The manual driving component is mainly a threaded structure, and a flat cam structure can also be used. The manual-dual-purpose driving component consists of a motor, a worm gear, and a worm, and is equipped with a travel switch. When the power is turned on, the motor rotates in a certain direction (such as the opening direction), drives the valve stem to move upward through the worm gear and worm, causing the valve plate to rise. When the valve rises to a certain height, the travel switch automatically cuts off the power, and the movement of the valve stem immediately stops, and vice versa. When operating manually, loosen the handwheel locknut and turn the handwheel in a certain direction by hand. The pneumatic driving component uses compressed dry air as the power, changes the air path direction through an electromagnetic directional valve, pushes the cylinder piston up and down, drives the valve stem up and down, and opens and closes the valve plate, so as to achieve the purpose of connecting or stopping the air flow.

[0003] A patent document with the publication number CN103470786A discloses a vacuum baffle valve, which includes a handle, a pressure plate, a threaded rod, a valve body, a washer, an inlet chamber, a baffle, and an outlet chamber. The valve body is provided with an inlet chamber and an outlet chamber, and the valve body is also provided with a pressure plate. The threaded rod is passed through the pressure plate, and a handle and a baffle are respectively provided at both ends of the threaded rod. A washer is provided on the baffle. The present invention realizes the up and down adjustment of the threaded rod by adjusting the handle, realizes the separation and closing of the baffle and the step. Since the thread has the functions of self-locking and fine adjustment, the opening and closing of the vacuum baffle valve can be conveniently realized, and the baffle valve can be locked to prevent air leakage. The work is stable, reliable and efficient. Since the structure of the present invention is simple, the cost is low.

[0004] However, when the baffle valve is used in an environment where the pressures on the inlet and outlet sides are relatively large, since the resistance caused by the pressure difference is greater than the pulling force of the lifting device, the valve often cannot be opened normally. In this case, the valve can only be opened normally after relieving the pressure first. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a valve with soft start, which balances the pressures at the inlet and outlet of the valve through a soft start port. Under the condition of pressure balance, the main port is then opened to achieve complete communication between the inlet and outlet.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a valve with soft start, which includes a valve body, a valve plate, a hollow shaft, a main spring, a cylinder housing, a valve core, a cylinder shaft and a soft start spring; the valve body is provided with an inlet and an outlet, the valve plate is arranged in the valve body and located between the inlet and the outlet, and the valve plate is used to control the on-off of the inlet and the outlet; the top of the valve plate is connected to the bottom of the hollow shaft; the cylinder housing is arranged on the top of the valve body; the top of the hollow shaft extends into the cylinder housing; the main spring is arranged between the valve plate and the cylinder housing; a soft start port is arranged at the bottom of the valve plate, and a pressure balance channel is arranged on the side of the valve plate, and the pressure balance channel is used to connect the soft start port and the inlet; the cylinder shaft penetrates through the hollow shaft and the valve plate, and the bottom of the cylinder shaft is used to control the opening and closing of the soft start port; the top of the cylinder shaft is connected to the valve core; the soft start spring is arranged between the valve plate and the hollow shaft; the side wall of the valve core is in dynamic seal connection with the inner wall of the cylinder housing; an upper ventilation interface and a lower ventilation interface are respectively arranged on the cylinder housing above and below the valve core, and both the upper ventilation interface and the lower ventilation interface are used to communicate with a compressed air mechanism.

[0008] Optionally, a valve seal ring is arranged between the valve body and the cylinder housing.

[0009] Optionally, a valve core seal ring is arranged between the valve core and the inner side wall of the cylinder housing.

[0010] Optionally, a bellows is arranged outside the main spring.

[0011] Optionally, a main valve plate seal ring is arranged between the bottom of the valve plate and the valve body.

[0012] Optionally, a shaft sleeve is arranged between the cylinder housing and the hollow shaft.

[0013] Optionally, a hollow shaft seal ring is arranged between the shaft sleeve and the hollow shaft.

[0014] Optionally, a sealing plate along the radial direction is arranged at the bottom end of the cylinder shaft, and a soft start port seal ring is arranged between the top of the sealing plate and the bottom of the valve plate.

[0015] Optionally, a shaft lower seal ring is arranged between the hollow shaft and the valve plate.

[0016] Optionally, the valve core and the cylinder shaft are connected by a shaft fixing bolt, and the shaft fixing bolt penetrates through the valve core and is threadedly connected to the cylinder shaft.

[0017] The present invention has achieved the following technical effects compared with the prior art:

[0018] In the valve with soft start of the present invention, by providing a pressure balance channel on the side of the valve plate, compressed air is first used to open the pressure balance channel to reduce the pressure difference between the inlet and the outlet, and then the valve plate is opened to reduce the difficulty of opening the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the valve with soft start of the present invention;

[0021] Figure 2 is a schematic structural diagram of the closed state of the valve with soft start of the present invention;

[0022] Figure 3 is a schematic structural diagram of the soft start opening of the valve with soft start of the present invention;

[0023] Figure 4 is a schematic structural diagram of the main port opening of the valve with soft start of the present invention.

[0024] Description of the reference numerals: 1. Shaft fixing bolt; 2. Shaft seal; 3. Soft start spring; 4. Retaining ring; 5. Upper shaft seal ring; 6. Valve seal ring; 7. Bellows; 8. Valve body; 9. Main body spring; 10. Valve plate; 11. Main valve plate seal ring; 12. Lower shaft seal ring; 13. Soft start port seal ring; 14. Upper air vent interface; 15. Cylinder housing; 16. Valve core; 17. Valve core seal ring; 18. Cylinder shaft; 19. Lower air vent interface; 20. Shaft sleeve; 21. Hollow shaft seal ring; 22. Hollow shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] As Figures 1 to 4As shown in the figure, this embodiment provides a valve with soft start, including a valve body 8, a valve plate 10, a hollow shaft 22, a main spring 9, a cylinder housing 15, a valve core 16, a cylinder shaft 18, and a soft start spring 3; the valve body 8 is provided with an inlet and an outlet, the valve plate 10 is arranged in the valve body 8 and located between the inlet and the outlet, and the valve plate 10 is used to control the on-off of the inlet and the outlet; the top of the valve plate 10 is connected to the bottom of the hollow shaft 22; the cylinder housing 15 is arranged on the top of the valve body 8; the top of the hollow shaft 22 extends into the cylinder housing 15; the main spring 9 is arranged between the valve plate 10 and the cylinder housing 15; a soft start port is arranged at the bottom of the valve plate 10, and a pressure balance channel is arranged on the side of the valve plate 10, and the pressure balance channel is used to connect the soft start port and the inlet; the cylinder shaft 18 penetrates through the hollow shaft 22 and the valve plate 10, and the bottom of the cylinder shaft 18 is used to control the opening and closing of the soft start port; the top of the cylinder shaft 18 is connected to the valve core 16; the soft start spring 3 is arranged between the valve plate 10 and the hollow shaft 22; the side wall of the valve core 16 is in dynamic seal connection with the inner wall of the cylinder housing 15; upper and lower venting interfaces 14 and 19 are respectively arranged on the cylinder housing 15 above and below the valve core 16, and both the upper venting interface 14 and the lower venting interface 19 are used to communicate with a compressed air mechanism.

[0027] In this specific embodiment, a valve seal ring 6 is arranged between the valve body 8 and the cylinder housing 15.

[0028] A valve core seal ring 17 is arranged between the valve core 16 and the inner side wall of the cylinder housing 15.

[0029] A bellows 7 is arranged outside the main spring 9.

[0030] A main valve plate seal ring 11 is arranged between the bottom of the valve plate 10 and the valve body 8.

[0031] A bushing 20 is arranged between the cylinder housing 15 and the hollow shaft 22.

[0032] A hollow shaft seal ring 21 is arranged between the bushing 20 and the hollow shaft 22.

[0033] A sealing plate along the radial direction is arranged at the bottom end of the cylinder shaft 18, and a soft start port seal ring 13 is arranged between the top of the sealing plate and the bottom of the valve plate 10.

[0034] A lower shaft seal ring 12 is arranged between the hollow shaft 22 and the valve plate 10.

[0035] The valve core 16 and the cylinder shaft 18 are connected by a shaft fixing bolt 1, and the shaft fixing bolt 1 penetrates through the valve core 16 and is threadedly connected to the cylinder shaft 18.

[0036] A groove is arranged at the center of the bottom of the valve core 16, the diameter of the groove is larger than the diameter of the cylinder shaft 18, the top of the cylinder shaft 18 extends into the groove, and a shaft seal 2 is arranged in the groove.

[0037] There is an installation groove above the hollow shaft 22, and a shaft upper sealing ring 5 is arranged at the bottom of the installation groove. A retaining ring 4 is arranged on the cylinder shaft 18 above the shaft upper sealing ring 5. The soft start spring 3 is arranged between the retaining ring 4 and the bottom of the valve core 16.

[0038] Compressed air is introduced through the upper air inlet interface 14, and the lower air outlet interface 19 exhausts. The valve core 16 moves downward, driving the cylinder shaft 18 to move downward, so that the sealing plate at the bottom of the cylinder shaft 18 moves downward. The fluid reaches the outlet from the inlet through the pressure balance channel and the soft start port at the bottom of the valve plate 10, thereby reducing the pressure difference between the inlet and the outlet until the pressure between the inlet and the outlet reaches equilibrium. In the case of pressure balance, compressed air is introduced through the lower air inlet interface 19, and the upper air outlet interface 14 exhausts. The valve core 16 moves upward, driving the cylinder shaft 18 to move upward. Further, the cylinder shaft 18 drives the hollow shaft 22 to move upward, so that the valve plate 10 moves upward, completing the opening of the main port and making the inlet and the outlet completely communicate.

[0039] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0040] Specific examples are used in this specification to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A valve with soft start, characterized in that, It includes a valve body, a valve plate, a hollow shaft, a main spring, a cylinder housing, a valve core, a cylinder shaft and a soft start spring; the valve body is provided with an inlet and an outlet, the valve plate is arranged in the valve body and located between the inlet and the outlet, and the valve plate is used to control the on-off of the inlet and the outlet; the top of the valve plate is connected to the bottom of the hollow shaft; the cylinder housing is arranged on the top of the valve body; the top of the hollow shaft extends into the cylinder housing; the main spring is arranged between the valve plate and the cylinder housing; The bottom of the valve plate is provided with a soft start port, and the side of the valve plate is provided with a pressure balance channel, and the pressure balance channel is used to communicate the soft start port and the inlet; The cylinder shaft penetrates through the hollow shaft and the valve plate, and the bottom of the cylinder shaft is used to control the opening and closing of the soft start port; the top of the cylinder shaft is connected to the valve core; the soft start spring is arranged between the valve plate and the hollow shaft; The side wall of the valve core is movably and sealingly connected to the inner wall of the cylinder housing; An upper ventilation interface and a lower ventilation interface are respectively arranged on the cylinder housing above and below the valve core, and both the upper ventilation interface and the lower ventilation interface are used to communicate with a compressed air mechanism.

2. The valve with soft start according to claim 1, characterized in that, A valve sealing ring is arranged between the valve body and the cylinder housing.

3. The valve with soft start according to claim 1, characterized in that, A valve core sealing ring is arranged between the valve core and the inner side wall of the cylinder housing.

4. The valve with soft start according to claim 1, characterized in that, A corrugated pipe is arranged outside the main spring.

5. The valve with soft start according to claim 1, characterized in that, A main valve plate sealing ring is arranged between the bottom of the valve plate and the valve body.

6. The valve with soft start according to claim 1, wherein A bushing is arranged between the cylinder housing and the hollow shaft.

7. The valve with soft start according to claim 6, characterized in that, A hollow shaft sealing ring is arranged between the bushing and the hollow shaft.

8. The valve with soft start according to claim 1, characterized in that, The bottom end of the cylinder shaft is provided with a radial sealing plate, and a soft start port sealing ring is arranged between the top of the sealing plate and the bottom of the valve plate.

9. The valve with soft start according to claim 1, characterized in that, A lower shaft sealing ring is arranged between the hollow shaft and the valve plate.

10. The valve with soft start according to claim 1, characterized in that, The valve core and the cylinder shaft are connected by a shaft fixing bolt, and the shaft fixing bolt penetrates through the valve core and is threadedly connected to the cylinder shaft.

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