High-pressure normally-open pilot head

Abstract

The utility model discloses a high pressure normally open pilot head, which relates to the technical field of pilot heads, and comprises a valve seat, the center of the upper end of the valve seat is provided with a pilot cavity, the bottom of the valve seat is provided with an air inlet and an air outlet, the air inlet and the air outlet are both communicated with the bottom of the pilot cavity at the upper end of the valve seat, and the upper end of the air outlet is provided with a conical pilot valve port. The static iron core is fixedly inserted into the upper end of a pilot cavity of the valve seat, the piston seat is inserted into the center of the bottom of the static iron core, the valve element sealing piston is inserted into the bottom of the piston seat, direct pressing and fixing are achieved through the integrated sealing shell, the overall sealing performance and stability are improved, and therefore the high pressure resistance of the pilot head is improved; and the valve element sealing piston is wrapped and reinforced by the piston seat, so that the structural stability of the valve element sealing piston is improved when the valve element sealing piston is pressed, and the high-pressure resistance of the pilot head is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pilot head technical field, concretely relates to a high pressure normally open pilot head. BACKGROUND

[0002] On the current market, the use range of the pilot head pressure control equipment of 9mm outer diameter is usually limited to the highest 0.8PMa, which means that their application scenarios are relatively limited, and they cannot meet the specific needs of the environment that needs to bear higher pressure, for this purpose, we provide a high pressure normally open pilot head. UTILITY MODEL CONTENTS

[0003] The utility model discloses a high pressure normally open pilot head, which can solve the problem of limited use range of the pilot head with 9mm outer diameter and meet the needs of higher pressure range.

[0004] The utility model discloses a high pressure normally open pilot head, which can solve the problem of limited use range of the pilot head with 9mm outer diameter and meet the needs of higher pressure range.

[0005] A high pressure normally open pilot head, comprising a valve seat, a pilot cavity is arranged at the upper end center of the valve seat, and an air inlet hole and an air outlet hole are formed in the bottom of the valve seat, the air inlet hole and the air outlet hole are both communicated with the bottom of the pilot cavity at the upper end of the valve seat, and the upper end of the air outlet hole is provided with a conical guide valve port, a static iron core is fixedly connected to the upper end of the pilot cavity of the valve seat, a piston seat is arranged at the bottom center of the static iron core, a valve core sealing piston is arranged at the bottom of the piston seat, a normally open spring is arranged between the bottom of the piston seat and the bottom of the pilot cavity at the upper end of the valve seat, a balance hole is formed in one side of the piston seat, the balance hole is communicated with the bottom of the pilot cavity of the piston seat and the inner cavity of the static iron core, a compression spring is arranged between the upper end of the valve core sealing piston and the bottom of the insertion slot of the piston seat, a connecting rod is fixedly connected to the center of the piston seat, a moving iron core is fixedly connected to the upper end of the connecting rod after penetrating through the static iron core, a sealing shell is fixedly connected to the upper ends of the moving iron core and the static iron core, and the bottom of the sealing shell is fixedly connected to the pilot cavity at the upper end of the valve seat.

[0006] Further, the outer wall lower end of the sealing shell is provided with an annular connecting cover plate, a plurality of annular grooves are formed in the outer wall middle part of the annular connecting cover plate, and a plurality of shell sealing rings are respectively clamped and fixed in the annular grooves.

[0007] Further, a compression screw seat is fixedly connected to the upper end of the valve seat corresponding to the edge of the pilot cavity, a threaded compression cylinder is screw-connected in the compression screw seat, and the lower end of the threaded compression cylinder abuts against the upper edge of the annular cover plate at the lower end of the outer wall of the sealing shell.

[0008] Further, the bottom of the piston seat is provided with a connecting sleeve corresponding to the outside of the piston seat, and the side wall of the pilot chamber of the valve seat is provided with an annular step corresponding to the bottom of the connecting sleeve of the piston seat, the connecting sleeve of the piston seat is fixedly connected with a contact sealing gasket on the upper side and the lower side, and the contact sealing gasket on the upper side is in abutment with the bottom of the annular connecting cover plate of the sealing shell, and the contact sealing gasket on the lower side is in abutment with the step surface of the side wall of the pilot chamber of the valve seat.

[0009] Further, the sealing ring of the shell comprises an NBR sealing ring and a fluorine rubber sealing ring.

[0010] Further, the outer wall of the connecting rod is sleeved with a graphite lubricating sleeve.

[0011] The utility model discloses beneficial effects are as follows:

[0012] 1, the utility model discloses a direct compression fixed integrated sealing shell, improve the overall sealing and stability, thereby improve the high pressure resistance of pilot head, through the wrapping of piston seat to valve core sealing piston and reinforce, improve the stability of structure when valve core sealing piston is under pressure, thereby further improve the high pressure resistance of pilot head.

[0013] 2, the utility model discloses the compression threaded seat and threaded compression cylinder are set up, and the annular cover plate of sealing shell outer wall lower end is compressed fixed through the thread self -locking of compression threaded seat and threaded compression cylinder, further enhance the connection stability between sealing shell and valve seat, ensure the stable operation of pilot head under high pressure environment, prevent the gas leakage problem caused by loose connection.

[0014] 3, the utility model discloses the sealing ring of shell, improve the sealing performance between sealing shell and valve seat, effectively prevent high pressure gas leakage, enhance the overall sealing and high pressure resistance of pilot head. DRAWINGS

[0015] Figure 1 It is the internal structure diagram of the utility model;

[0016] Figure 2 It is the utility model Figure 1 A enlarged view of the place.

[0017] Drawing reference: 1, valve seat;2, sealing shell;3, moving iron core;4, static iron core;5, piston seat;6, compression spring;7, valve core sealing piston;8, air inlet hole;9, air outlet hole;10, conical guide valve port;11, always open spring;12, connecting rod;13, balance hole;14, sealing ring of shell;15, compression threaded seat;16, threaded compression cylinder;17, contact sealing gasket. CONCRETE IMPLEMENTATION

[0018] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings in the utility model embodiment.

[0019] Please refer to Figure 1 - Figure 2 The utility model provides a high pressure normally open pilot head, including valve seat 1, the upper end center of valve seat 1 is provided with pilot chamber, and the bottom of valve seat 1 is provided with air inlet hole 8 and air outlet hole 9, air inlet hole 8 and air outlet hole 9 all are communicated with the bottom pilot chamber of valve seat 1 upper end, and the upper end of air outlet hole 9 is provided with conical pilot port 10, the upper end of pilot chamber of valve seat 1 is inserted and is fixed with static core 4, and the bottom center of static core 4 is inserted with piston seat 5, the bottom of piston seat 5 is inserted with valve core sealing piston 7, and the bottom between piston seat 5 and valve seat 1 upper end pilot chamber is installed with normally open spring 11, one side of piston seat 5 is provided with balance hole 13, and balance hole 13 is communicated piston seat 5 bottom pilot chamber and static core 4 inner chamber, the upper end between valve core sealing piston 7 and the insertion slot bottom of piston seat 5 is provided with compression spring 6, the center of piston seat 5 is fixedly connected with connecting rod 12, and the upper end of connecting rod 12 is fixedly connected with dynamic core 3 after penetrating static core 4, the upper end of dynamic core 3 and static core 4 is sleeved and is fixed with sealing shell 2, and the bottom of sealing shell 2 is inserted and is fixed with pilot chamber upper end of valve seat 1.

[0020] The working principle and use flow of the utility model: when the device is used, when high pressure gas enters the pilot chamber of valve seat 1 through air inlet hole 8, the gas pressure acts on the bottom of valve core sealing piston 7, due to the pre-tightening force of normally open spring 11, valve core sealing piston 7 keeps separated from conical pilot port 10 in initial state, so that the gas can flow out freely from pilot chamber through air outlet hole 9. When the pilot head needs to be closed, the static core 4 generates magnetic attraction force after the external electromagnetic coil is electrified, attracts dynamic core 3 to move, drives connecting rod 12 and piston seat 5 to press down together. At this time, valve core sealing piston 7 gradually approaches and finally seals conical pilot port 10, blocks the gas outflow path, realizes the closing function of pilot head. The setting of balance hole 13 helps the balance of the internal and external air pressure of piston seat 5, reduces the resistance when piston seat 5 moves. Compression spring 6 is used to keep the stable position of valve core sealing piston 7 in the insertion slot, ensures the reliability of sealing effect. The whole device structure is simple, convenient to operate, can effectively realize the normally open and normally closed control of high pressure gas.

[0021] The pilot head of the application is provided with a 6.5W coil, which can reach a 1.0PMa pressure application range, and a 2.5mm flow hole diameter, so as to meet more extensive application requirements. The integrated sealing shell 2 is directly pressed and fixed, so as to improve the overall sealing performance and stability, thereby improving the high-pressure resistance of the pilot head. The piston seat 5 is used to wrap and reinforce the valve core sealing piston 7, so as to improve the stability of the structure of the valve core sealing piston 7 under pressure, thereby further improving the high-pressure resistance of the pilot head.

[0022] In the embodiment, the lower end of the outer wall of the sealing shell 2 is provided with an annular connecting cover plate, and a plurality of annular grooves are formed in the middle of the outer wall of the annular connecting cover plate. The outer shell sealing ring 14 is respectively clamped and fixed in the plurality of annular grooves. The outer shell sealing ring 14 improves the sealing performance between the sealing shell 2 and the valve seat 1, effectively prevents high-pressure gas leakage, and enhances the overall sealing performance and high-pressure resistance of the pilot head.

[0023] In the embodiment, the upper end of the valve seat 1 is fixedly connected to the edge of the pilot cavity and is provided with a pressing screw seat 15. The pressing screw seat 15 is threadedly connected to a threaded pressing cylinder 16. The lower end of the threaded pressing cylinder 16 abuts against the upper edge of the annular cover plate of the lower end of the outer wall of the sealing shell 2. The pressing screw seat 15 and the threaded pressing cylinder 16 are used to press and fix the annular cover plate of the lower end of the outer wall of the sealing shell 2 through the thread self-locking of the pressing screw seat 15 and the threaded pressing cylinder 16. The connection stability between the sealing shell 2 and the valve seat 1 is further enhanced, the stable operation of the pilot head in a high-pressure environment is ensured, and the gas leakage problem caused by loose connection is prevented.

[0024] In the embodiment, the bottom of the piston seat 5 is provided with a connecting sleeve corresponding to the outer side of the piston seat 5. The upper edge of the pilot cavity side wall of the valve seat 1 is provided with an annular step corresponding to the bottom of the connecting sleeve of the piston seat 5. The sleeve of the piston seat 5 is fixedly connected to the contact sealing gasket 17 on the upper and lower sides. The upper contact sealing gasket 17 abuts against the bottom of the annular connecting cover plate of the sealing shell 2, and the lower contact sealing gasket 17 abuts against the step surface of the pilot cavity side wall of the valve seat 1. The contact sealing gasket 17 is used to further improve the sealing performance between the piston seat 5 and the sealing shell 2 and the valve seat 1, so as to ensure that the high-pressure gas will not leak from the contact surfaces, thereby further enhancing the overall sealing performance and high-pressure resistance of the pilot head. This design not only improves the reliability and service life of the product, but also enables the pilot head to maintain stable performance in various high-pressure environments, thereby meeting more extensive application requirements.

[0025] In the embodiment, preferably, the shell sealing ring 14 comprises an NBR sealing ring and a fluorine rubber sealing ring; the shell sealing ring 14 adopts the combined design of the NBR sealing ring and the fluorine rubber sealing ring, thereby improving the sealing effect, enhancing the corrosion resistance and high-temperature resistance of the sealing element, and making the pilot head more suitable for high-pressure environment.

[0026] In the embodiment, preferably, the outer wall of the connecting rod 12 is sleeved with a graphite lubricating sleeve; the graphite lubricating sleeve is arranged to reduce the frictional resistance of the connecting rod 12 during movement, improve the sensitivity and service life of action, and make the pilot head maintain good stability and reliability during long-time operation, reduce the frequency of maintenance and replacement, and reduce the use cost.

[0027] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure normally open pilot head, comprising a valve seat (1), a pilot cavity is centrally arranged at the upper end of the valve seat (1), and a gas inlet hole (8) and a gas outlet hole (9) are arranged at the bottom of the valve seat (1), both of which are communicated with the bottom of the pilot cavity at the upper end of the valve seat (1), and a tapered pilot valve port (10) is arranged at the upper end of the gas outlet hole (9), characterized in that: The upper end of the pilot chamber of the valve seat (1) is inserted and fixed with a static core (4), and the bottom center of the static core (4) is inserted with a piston seat (5), the bottom of the piston seat (5) is inserted with a valve core sealing piston (7), and the bottom of the piston seat (5) and the bottom of the pilot chamber of the valve seat (1) are installed with a normally open spring (11), one side of the piston seat (5) is provided with a balance hole (13), and the balance hole (13) communicates the bottom pilot chamber of the piston seat (5) and the inner cavity of the static core (4), the upper end of the valve core sealing piston (7) and the bottom of the insertion slot of the piston seat (5) are provided with a compression spring (6), the center of the piston seat (5) is fixedly connected with a connecting rod (12), and the upper end of the connecting rod (12) penetrates the static core (4) and is fixedly connected with a moving core (3), the upper end of the moving core (3) and the static core (4) is sleeved and fixed with a sealing shell (2), and the bottom of the sealing shell (2) is inserted and fixed with the pilot chamber of the valve seat (1).

2. A high pressure, normally open pilot head according to claim 1, characterized in that: The outer wall of the sealing shell (2) is provided with an annular connecting cover plate, and a plurality of annular grooves are formed in the middle of the outer wall of the annular connecting cover plate, and a plurality of shell sealing rings (14) are respectively clamped and fixed in the annular grooves.

3. A high pressure, normally open pilot head according to claim 2, characterized in that: The upper end of the valve seat (1) is fixedly connected with a compression threaded seat (15) corresponding to the edge of the pilot chamber, and a threaded compression cylinder (16) is threadedly connected in the compression threaded seat (15), and the lower end of the threaded compression cylinder (16) abuts against the upper edge of the annular cover plate at the lower end of the outer wall of the sealing shell (2).

4. A high pressure, normally open pilot head according to claim 3, characterized in that: The bottom of the piston seat (5) is provided with a connecting sleeve corresponding to the outer side of the piston seat (5), and the upper edge of the side wall of the pilot chamber of the valve seat (1) is provided with an annular step corresponding to the bottom of the connecting sleeve of the piston seat (5), the sleeve of the piston seat (5) is fixedly connected with a contact sealing gasket (17) on both sides, and the upper side of the contact sealing gasket (17) abuts against the bottom of the annular connecting cover plate of the sealing shell (2), and the lower side of the contact sealing gasket (17) abuts against the step surface of the side wall of the pilot chamber of the valve seat (1).

5. A high pressure, normally open pilot head according to claim 2, characterized in that: The shell sealing ring (14) comprises an NBR sealing ring and a fluorine rubber sealing ring.

6. A high pressure, normally open pilot head according to claim 1, characterized in that: The outer wall of the connecting rod (12) is sleeved with a graphite lubricating sleeve.

Images