A mechanical locking valve

Abstract

The invention discloses a mechanical locking valve, comprising a piston assembly and a locking structure, wherein the rear side of the piston rod is pushed by the locking structure, an adjusting spring is installed between the piston rod and the piston head, and a reset spring is also installed between the piston rod and the housing to push the piston rod backward, and the locking structure comprises a locking plate, a pressure rod, and a locking rod, wherein the locking plate is an arc-shaped thin plate, and the locking plate has a track parallel to the axial direction and a ratchet located at the front end; the end of the locking rod is a cylindrical section, and the rear part of the cylindrical section can be inserted into the center of the locking plate, and the front end of the cylindrical section is provided with a clamping block adapted to the track, and the clamping block is provided with an inclined surface to form a clamping block wedge tooth, and the clamping block wedge tooth and the ratchet of the locking plate are adapted, and the outer side of the clamping block wedge tooth and the tooth surface of the pressure rod are adapted; under the push of the pressure rod, the locking rod drives the piston rod to extend, and the piston head is pressed against the inner tube wall of the housing to realize the closing function of the device, and at this time, the clamping block of the locking rod is clamped on the tooth surface of the pressure rod to realize the locking of the device. The structure is simple and the applicable pressure range is large.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic valve bodies, and in particular to a mechanical locking valve. Background Art

[0002] As a mechanical device that controls the flow, pressure and flow rate of fluid media, valves play an important role in pipeline systems. Among them, solenoid valves use electromagnetic force to open and close the valve, thereby controlling the flow of fluid media.

[0003] The solenoid valve needs power supply when working. In some working conditions that require frequent switching and continuous operation, the coil will heat up and age. In terms of model categories, solenoid valves are usually divided into low pressure (0MPa-1MPa), medium pressure (0MPa-5MPa), and high pressure (5MPa-20MPa). The pressure range that a single model can carry is not wide enough. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a mechanical locking valve with a wide applicable pressure range.

[0005] The technical solution adopted by the present invention is a mechanical locking valve, comprising a shell, a piston head for blocking the gas path on the shell, the front of the piston head is a sealing end face, the sealing end face is in contact with the shell to block the gas path, the rear end of the piston head is fastened to the front end of the connecting shaft, the rear end of the connecting shaft is plugged into the piston rod, and the rear side of the piston rod is pushed by the locking structure; an adjusting spring is installed between the piston rod and the piston head, and a reset spring is also installed between the piston rod and the shell to push the piston rod backwards.

[0006] The locking structure includes a locking plate, a pressure rod, and a locking rod.

[0007] The locking plate is an arc-shaped thin plate, fixed to the inner side of the end of the shell, and has a track parallel to the axial direction and a ratchet located at the front end;

[0008] The pressure rod is cylindrical and inserted into the middle of the locking plate. A guide block matching the track of the locking plate is provided on the outer side of the cylinder wall. A tooth surface protruding forward is provided at the front end of the pressure rod.

[0009] The end of the locking rod is a cylindrical section, the rear part of which can be inserted into the center of the locking plate, and the front end of the cylindrical section is provided with a clamping block adapted to the track, and the clamping block is provided with an inclined surface to form a clamping block wedge tooth, the clamping block wedge tooth is adapted to the ratchet tooth of the locking plate, and the outer side of the clamping block wedge tooth is adapted to the tooth surface of the pressure rod;

[0010] Under the push of the pressure rod, the locking rod drives the piston rod to extend, and the piston head is pressed against the inner tube wall of the shell to realize the closing function of the device. In this state, the block of the locking rod is stuck on the tooth surface of the pressure rod to lock the device.

[0011] When the locking rod is slightly pushed forward and the adjusting spring is compressed, the wedge teeth of the locking rod's card block are pushed by the tooth surface of the pressure rod and the two inclined surfaces make the two slide relative to each other. The wedge teeth of the card block slide into the track of the locking plate and move backward under the pressure of the reset spring, driving the connecting groove, piston rod and piston head to move backward, thereby opening the device.

[0012] The beneficial effect of the present invention is that the reciprocating motion of the piston rod in the valve body is controlled by the locking mechanism at the rear end of the device, thereby realizing the opening and closing of the valve. Due to its own mechanical structure, it has a large bearing capacity and is suitable for the passage and blocking of 0MPa-10MPa gas. The gas working pressure covers a wide range, meets conventional needs, and does not require power supply. The device has the characteristics of small space occupation, simple structure, and convenient operation. It can well meet the on-off of gas under different pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the internal structure of a mechanical locking valve according to an embodiment of the present application.

[0014] Figure 2 This is a schematic diagram of the rear end locking state of a mechanical locking valve according to an embodiment of the present application.

[0015] Figure 3 This is a schematic diagram of the unlocked state of the rear end of a mechanical locking valve in an embodiment of the present application.

[0016] Figure 4 This is the explosion diagram of the locking mechanism.

[0017] Markings in the figure are: 1-housing, 2-piston head, 3-adjusting spring, 4-connecting shaft, 5-piston rod, 6-retaining ring, 7-return spring, 8-connecting groove, 9-outer cylinder, 10-pressure rod, 101-guide block, 102-tooth surface, 11-locking plate, 111-track, 112-ratchet, 12-locking rod, 121-block, 122-block wedge tooth, 13-O-ring Ι, 14-O-ring ΙΙ, 15-trapezoidal sealing ring. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1-Figure 4As shown, the mechanical locking valve of the present invention comprises a housing, a piston head and a piston rod 5 assembly are installed in the housing, the front of the piston head is a sealing end face, the sealing end face is attached to the housing and then blocks the gas path, the rear end of the piston head is fastened to the front end of the connecting shaft 4, the rear end of the connecting shaft 4 is plugged with the piston rod 5, and the rear side of the piston rod 5 is pushed by the locking structure; an adjusting spring 3 is installed between the piston rod 5 and the piston head 2, and a return spring 7 is also installed between the piston rod 5 and the housing to push the piston rod 5 backward, the gas path inlet is located in the cavity between the piston head and the piston rod 5, two sealing rings are arranged between the piston rod 5 and the housing, and a sealing ring is also arranged between the piston head and the housing, so that the opening and locking of the movement control device of the piston head are controlled. For the convenience of installation, the housing comprises a front shell and a rear outer tube 9, the locking structure is located inside the outer tube 9, and the inner tube and the outer tube 9 are connected by a flange. A retaining ring 6 is installed on the housing, and a connecting groove 8 is also installed at the rear end of the piston rod 5, and the return spring 7 is installed between the retaining ring 6 and the connecting groove 8.

[0020] The locking structure includes a locking plate 11, a pressure rod 10, and a locking rod 12.

[0021] The locking plate 11 is an arc-shaped thin plate fixed on the inner side of the end of the shell. The locking plate 11 has a track 111 parallel to the axial direction and a ratchet 112 at the front end. The locking plate 11 is divided into four and evenly distributed in the circumferential direction. The track 111 is formed between each locking plate 11, and each locking plate 11 has a ratchet 112 at the front end.

[0022] The pressure rod 10 is cylindrical and inserted into the middle of the locking plate 11. A guide block 101 is provided on the outer side of the cylinder wall and matches the track 111 of the locking plate 11. A tooth surface 102 protruding forward is provided at the front end of the pressure rod 10. The guide block 101 at the front end of the pressure rod 10 is in the shape of a small cylinder and can slide smoothly in the track 111 of the locking plate 11.

[0023] The end of the locking rod 12 is a cylindrical section, the rear part of the cylindrical section can be inserted into the center of the locking plate 11, and the front end of the cylindrical section is provided with a block that is compatible with the track 111. The block is provided with an inclined surface to form a block wedge tooth 122, and the block wedge tooth 122 is compatible with the ratchet tooth 112 of the locking plate 11, and the outer side of the block wedge tooth 122 is compatible with the tooth surface 102 of the pressure rod 10; since the block wedge tooth 122 of the locking rod 12 and the locking plate 11 and the pressure rod 10 are matched with inclined surfaces, under the pressure of the spring, each time the locking rod 12 contacts the locking plate 11 or the pressure rod 10, it will rotate and get stuck in different positions, achieving different locked and unlocked states.

[0024] Push the pressure rod 10 forward, and the locking rod 12, under the push of the pressure rod 10, drives the piston rod 5 to extend forward, and pushes the piston head 2 to press against the inner tube wall of the shell, closing the gas path. In this state, the pressure of the pressure rod 10 is actually removed, and since the wedge teeth 122 of the locking rod 12 are stuck on the ratchet teeth 112 of the locking plate, the piston rod 5, the connecting groove 6, and the piston head 2 cannot retreat, thus achieving the locking of the device. The shell of the piston head is in the shape of a bell mouth, so the piston head is also in the shape of a wedge. A sealing ring is provided on the piston head, and the sealing ring is trapezoidal, which has achieved better sealing performance.

[0025] When the locking rod 12 is pushed forward, its tooth surface 102102 pushes the outer edge of the block wedge tooth 122 of the locking rod 12, causing the locking rod 12 to move forward. Since the adjusting spring 3 is relatively rigid, it can only be slightly compressed. At this time, the block wedge tooth 122 of the locking rod 12 slides relative to the tooth surface 102, and the locking rod 12 rotates, causing the block wedge tooth 122 to slide into the track 111 of the locking plate 11, and move backward with a large stroke under the pressure of the reset spring 7, and drive the connecting groove 8, the piston rod 5, and the piston head to move backward, and the air path is connected to realize the opening of the device.

[0026] The mechanical locking valve of the present invention has the characteristics of small space occupation, simple structure, convenient operation, etc., and can well meet the requirements of gas on-off under different pressures.

Claims

1. A mechanical locking valve, comprising a housing and a piston head (2) for blocking an air path on the housing, characterized in that: The front of the piston head (2) is a sealing end face, which seals the gas path after being attached to the housing. The rear end of the piston head (2) is fastened to the front end of the connecting shaft (4), and the rear end of the connecting shaft (4) is plugged into the piston rod (5). The rear side of the piston rod (5) is pushed by the locking structure. An adjusting spring (3) is installed between the piston rod (5) and the piston head (2), and a return spring (7) is also installed between the piston rod (5) and the housing to push the piston rod (5) backward. The locking structure comprises a locking plate (11), a pressure rod (10), and a locking rod (12). The locking plate (11) 11 is an arc-shaped thin plate fixed to the inner side of the end of the housing, and the locking plate (11) has a track (111) parallel to the axial direction and a ratchet (112) located at the front end; The pressure rod (10) is cylindrical and inserted into the middle of the locking plate (11). A guide block (101) matching the track (111) of the locking plate (11) is provided on the outer side of the cylinder wall. A tooth surface (102) protruding forward is provided at the front end of the pressure rod (10). The end of the locking rod (12) is a cylindrical section, the rear part of which can be inserted into the center of the locking plate (11), and the front end of the cylindrical section is provided with a clamping block (121) adapted to the track (111), and the clamping block (121) is provided with an inclined surface to form a clamping block wedge tooth (122), the clamping block wedge tooth (122) is adapted to the ratchet tooth (112) of the locking plate (11), and the outer side of the clamping block wedge tooth (122) is adapted to the tooth surface (102) of the pressure rod (10); The locking rod (12) is pushed by the pressure rod (10) to drive the piston rod (5) to extend, and the piston head is pressed against the inner tube wall of the shell to achieve the closing function of the device. In this state, the block (121) of the locking rod (12) is stuck on the ratchet (112) of the locking plate (11), thereby achieving the locking of the device. When the locking rod (12) is slightly pushed forward, the adjustment spring (3) is compressed, and the block wedge teeth (122) of the locking rod (12) are pushed by the tooth surface (102) of the pressure rod (10) and the two inclined surfaces make the two slide relative to each other. The block wedge teeth (122) slide into the track (111) of the locking plate (11), and move backward under the pressure of the return spring (7), and drive the connecting groove (8), the piston rod (5) and the piston head (2) to move backward, thereby realizing the opening of the device.

2. The mechanical locking valve according to claim 1, characterized in that: The locking plates (11) are divided into four and are evenly distributed in the circumferential direction. A track (111) is formed between each locking plate (11). Each locking plate (11) has a ratchet (112) at the front section.

3. The mechanical locking valve according to claim 1, characterized in that: The gas path inlet is located in the cavity between the piston head (2) and the piston rod (5), and two sealing rings are provided between the piston rod (5) and the housing.

4. The mechanical locking valve according to claim 1, characterized in that: The housing comprises an outer shell at the front end and an outer cylinder (9) at the rear end, the locking structure is located inside the outer cylinder (9), and the inner cylinder and the outer cylinder (9) are connected via a flange.

5. The mechanical locking valve according to claim 1, characterized in that: The guide block (101) is cylindrical.

6. The mechanical locking valve according to claim 1, characterized in that: The housing is provided with a retaining ring (6), the rear end of the piston rod (5) is also provided with a connecting groove (8), and a return spring (7) is installed between the retaining ring (6) and the connecting groove (8).

7. The mechanical locking valve according to claim 1, characterized in that: A sealing ring is provided on the piston head (2), and the sealing ring is trapezoidal.

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