One-way valve and torsion spring mounting device therefor

Abstract

The invention provides a one-way valve and a torsion spring mounting device thereof, comprising a hook, a top rod, a sleeve, a spring, a screw plug, a pressing rod and a pin, wherein the hook is installed from the bottom of the sleeve along a round hole, and then the top of the hook is clamped into a large waist-shaped slot of the sleeve, and the top of a straight section of the hook is clamped into a small waist-shaped slot; the pressing rod passes through a hole of the screw plug, the bottom is fastened with a threaded hole at the top of the top rod, the pin is installed into a small hole on the pressing rod through interference fit, the spring is installed on the combination, and then the combination is installed into the sleeve; the external thread of the screw plug is screwed into the internal thread of the sleeve, the combination is pressed against the spring, and a gap of a certain size is kept between the hook and the top rod.

Description

Technical Field

[0001] This invention belongs to the field of aircraft fuel systems and relates to a one-way valve and its torsion spring mounting device. Background Technology

[0002] A one-way valve is a common type of one-way fuel supply device in aircraft fuel lines. It allows fuel to flow in from the open direction and closes when no fuel is being supplied, maintaining a closed fuel passage. To ensure reliable closure, a torsion spring is usually incorporated into the one-way valve to increase its closing force.

[0003] During installation and use, to ensure that the torsion spring provides torque in the same direction, it needs to be bent to a certain degree and installed in this state. This requires maintaining the clamping of the torsion spring shaft. Especially when the torsion spring shaft needs to be installed into a small hole, and the surrounding space of the hole is relatively narrow, making it difficult to place it directly by hand, a special torsion spring installation device is needed. This device can pass through the narrow space to achieve clamping and accurate installation of the torsion spring.

[0004] When the installation of torsion springs is complex and requires maintaining the clamping of the torsion spring for a long time, the conventional method of clamping with tweezers is quite laborious. Therefore, a device that can compress the torsion spring and automatically lock it is needed. Summary of the Invention

[0005] This invention provides a one-way valve and its torsion spring mounting device, thereby enabling convenient, quick, and labor-saving installation and positioning of the torsion spring within the one-way valve.

[0006] The technical solution of this invention: This invention provides a method for installing a torsion spring using a torsion spring mounting device. The torsion spring mounting device includes: a hook 1, a push rod 2, a sleeve 4, a spring 3, a screw plug 5, a pressure rod 6, and a pin 7. The method for installing the torsion spring is as follows: Hook 1 is inserted into the round hole from the bottom of sleeve 4, and then the top of hook 1 is inserted into the large waist-shaped groove of sleeve 4, and the top of the straight section of hook 1 is inserted into the small waist-shaped groove; the pressure rod 6 passes through the hole of the screw plug 5, and the bottom thread of the pressure rod 6 is fastened to the threaded hole at the top of the push rod 2; the pin 7 is installed into the small hole on the pressure rod 6 through interference fit; the spring 3 is installed on the assembly, and then they are all installed into sleeve 4; the external thread of the screw plug 5 is screwed into the internal thread of the sleeve 4, which drives the assembly to press the spring 3, and a certain size gap is maintained between hook 1 and push rod 2.

[0007] Furthermore, by holding the sleeve 4, the torsion spring shaft is passed through the gap between the hook 1 and the push rod 2, and wedged into the bent section of the hook 1. Pressing the pressure rod 6 will cause the push rod 2 to press the torsion spring shaft tightly between the hook 1 and the push rod 2, thus clamping the torsion spring. At the same time, the gap between the hook 1 and the push rod 2 will decrease, preventing the torsion spring shaft from slipping out. Then, the torsion spring shaft is installed in place. After installation, the pressure on the pressure rod 6 is released. The pressure rod 6 rebounds under the action of the spring force, and the gap between the hook 1 and the push rod 2 widens. Moving the sleeve 4 allows the torsion spring shaft to pass through the gap between the hook 1 and the push rod 2, thus retrieving the torsion spring installation device.

[0008] Furthermore, when it is necessary to maintain the clamping of the torsion spring shaft for a long time, after the torsion spring shaft is locked in the bent section of the hook 1, the screw plug 5 is screwed in to drive the push rod 2 to press against the torsion spring shaft, and then the screw plug 5 is locked to achieve long-term clamping of the torsion spring shaft.

[0009] Furthermore, the hook 1 is a steel wire with a bent bottom, the bent section being a semi-circle, and the top having a protrusion perpendicular to the straight section, the width of which is the same as the diameter of the steel wire.

[0010] Furthermore, the top of the push rod 2 is a cylinder with a threaded hole. The two sides of the cylinder are flattened to facilitate fixing when tightening the threads, and a threaded hole is opened in the middle of the cylinder.

[0011] Furthermore, sleeve 4 is a combination of two cylindrical sections, with a small waist-shaped groove and a large waist-shaped groove at the bottom. The width of the two waist-shaped grooves is the same as the diameter of the straight section of hook 1. The middle of the sleeve has three stepped holes of different diameters, with the largest diameter hole at the top being a threaded hole.

[0012] Furthermore, the screw plug 5 is a combination of a threaded cylinder and a large cylinder, with a through hole in the middle.

[0013] Furthermore, the pressure rod 6 is a stepped shaft composed of four cylindrical sections, with the small cylinder at the bottom being a threaded shaft, and a through hole perpendicular to the axis being opened near the top.

[0014] Furthermore, the pin 7 is installed in the small hole of the pressure rod 6 by interference fit to limit the position of the pressure rod 6.

[0015] The present invention provides a one-way valve and its torsion spring installation device, which can conveniently and quickly clamp the torsion spring shaft, realizing the rapid installation of the torsion spring in a narrow space; it has two working modes, manual pressing and twisting pressing, which can be selected according to needs; by changing the top rod with different bending section radii, torsion springs with different wire diameters can be installed. Attached Figure Description

[0016] Figure 1This is an overall drawing of a one-way valve and its torsion spring mounting device provided by the present invention; Figure 2 This is an exploded view of the torsion spring mounting device provided by the present invention; Figure 3 This is a full sectional view of the torsion spring mounting device provided by the present invention; Figure 4 This is a cross-sectional view (AA) of the torsion spring mounting device provided by the present invention; Figure 5 This is a BB cross-sectional view of the torsion spring mounting device provided by the present invention; Figure 6 This is a schematic diagram of the tightness / looseness state of the torsion spring mounting device provided by the present invention; Figure 7 This is a schematic diagram of the pressing and tightening state of the torsion spring mounting device provided by the present invention; Figure 8 This is a schematic diagram of the torsion spring mounting device provided by the present invention in the state of rotation and compression. Figure 9 This is a schematic diagram of the operation of a one-way valve and its torsion spring mounting device provided by the present invention.

[0017] Among them, 1-hook, 2-top rod, 3-spring, 4-sleeve, 5-screw plug, 6-pressure rod, 7-pin, 8-base, 9-torsion spring, 10-shaft. Detailed Implementation

[0018] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.

[0019] Example 1 like Figures 1-3 As shown, this application provides a method for installing a torsion spring using a torsion spring mounting device. The torsion spring mounting device includes: a hook 1, a push rod 2, a sleeve 4, a spring 3, a screw plug 5, a pressure rod 6, and a pin 7. The method for installing the torsion spring is as follows: Hook 1 is inserted into the round hole from the bottom of sleeve 4, and then the top of hook 1 is inserted into the large waist-shaped groove of sleeve 4, while the top of the straight section of hook 1 is inserted into the small waist-shaped groove. Pressure rod 6 passes through the hole of plug 5, and its bottom thread is fastened to the threaded hole at the top of top rod 2. Pin 7 is installed into the small hole on pressure rod 6 through an interference fit. Spring 3 is installed on the assembly, and then both are inserted into sleeve 4. The external thread of plug 5 is screwed into the internal thread of sleeve 4, causing the assembly to press spring 3, maintaining a certain gap between hook 1 and top rod 2. Torsion spring 9 is placed in the middle of the lugs of base 8, with the long shaft of torsion spring 9 pressing against base 8, and the short shaft of torsion spring 9 passing through the small hole of base 8. Shaft 10 passes through the two holes of base 8 and torsion spring 9 in sequence.

[0020] Specifically, hold the sleeve 4 by hand, and guide the torsion spring shaft through the gap between the hook 1 and the push rod 2, wedging it into the bent section of the hook 1. Press down on the pressure rod 6, which will cause the push rod 2 to press the torsion spring shaft tightly between the hook 1 and the push rod 2, thus clamping the torsion spring. At the same time, the gap between the hook 1 and the push rod 2 will decrease, preventing the torsion spring shaft from slipping out. Then, install the torsion spring shaft in place. After installation, release the pressure on the pressure rod 6. The pressure rod 6 will spring back under the spring force, widening the gap between the hook 1 and the push rod 2. Move the sleeve 4 to allow the torsion spring shaft to pass through the gap between the hook 1 and the push rod 2, thus retrieving the torsion spring installation device.

[0021] Specifically, when it is necessary to maintain the clamping of the torsion spring shaft for a long time, after the torsion spring shaft is locked in the curved section of the hook 1, the screw plug 5 is screwed in to drive the push rod 2 to press against the torsion spring shaft, and then the screw plug 5 is tightened to achieve long-term clamping of the torsion spring shaft.

[0022] Specifically, hook 1 is a steel wire with a bent bottom, the bent section is a semi-circle, and the top is a boss that is perpendicular to the straight section. The width of the boss is the same as the diameter of the steel wire.

[0023] Specifically, the bending radius of hook 1 has different sizes, including 0.5mm, 0.75mm, and 1mm.

[0024] Specifically, the top of the top rod 2 is a cylinder with a threaded hole, and the two sides of the cylinder are flattened to facilitate fixing when tightening the threads. There is a threaded hole in the middle of the cylinder.

[0025] Specifically, sleeve 4 is a combination of two cylindrical sections, such as... Figure 4 and Figure 5 As shown, there is a small waist-shaped groove and a large waist-shaped groove at the bottom. The width of the two waist-shaped grooves is the same as the diameter of the straight segment of hook 1. The sleeve has three stepped holes of different diameters in the middle, and the largest hole at the top is a threaded hole.

[0026] Specifically, the plug 5 is a combination of a threaded cylinder and a large cylinder, with a through hole in the middle.

[0027] Specifically, the pressure rod 6 is a stepped shaft composed of four cylindrical sections. The small cylinder at the bottom is a threaded shaft, and a through hole perpendicular to the axis is opened near the top.

[0028] Specifically, the pin 7 is installed in the small hole of the pressure rod 6 by interference fit to limit the position of the pressure rod 6.

[0029] This application provides a one-way valve, which is implemented using the torsion spring mounting device described above.

[0030] Example 2 This invention provides a one-way valve and its torsion spring mounting device. The device utilizes the lever principle; when the handle is gripped with one hand, using the main shaft as a fulcrum, pressing down on the longer end of the handle causes the other end to lift. This lifts the pull rod disc via a bushing, thereby driving the plunger to reciprocate linearly within the middle housing cavity. This process allows for plunger movement break-in and improves its flexibility. Adjusting shims of varying thicknesses indirectly indicate the plunger's opening degree, thus adjusting the position sensor to achieve parameter fixing and positional accuracy control.

[0031] The hook 1 is inserted into the round hole from the bottom of the sleeve 4, and then the top of the hook 1 is inserted into the large waist-shaped groove of the sleeve 4, and the top of the straight section of the hook 1 is inserted into the small waist-shaped groove; the pressure rod 6 passes through the hole of the screw plug 5, and the bottom thread is fastened to the threaded hole at the top of the top rod 2; the pin 7 is installed into the small hole on the pressure rod 6 through an interference fit; the spring 3 is installed on the assembly, and then they are all installed into the sleeve 4; the external thread of the screw plug 5 is screwed into the internal thread of the sleeve 4, which drives the assembly to press the spring 3, and a certain size gap is maintained between the hook 1 and the top rod 2.

[0032] The hook 1 is a steel wire with a bent bottom, the bent section being a semi-circle, and the top having a protrusion perpendicular to the straight section, the width of which is the same as the diameter of the steel wire.

[0033] The bending radius of the hook 1 has different sizes, including 0.5mm, 0.75mm, and 1mm.

[0034] The top of the top rod 2 is a cylindrical section with flattened sides and a threaded hole in the middle.

[0035] The sleeve 4 is a combination of two cylindrical sections, with a small waist-shaped groove and a large waist-shaped groove at the bottom. The width of the two waist-shaped grooves is the same as the diameter of the straight section of the hook 1. The middle of the sleeve has three stepped holes of different diameters, and the largest diameter hole at the top is a threaded hole.

[0036] The plug 5 is a combination of a threaded cylinder and a large cylinder, with a through hole in the middle.

[0037] The pressure rod 6 is a stepped shaft composed of four cylindrical sections. The small cylinder at the bottom is a threaded shaft, and a through hole perpendicular to the axis is opened near the top.

[0038] The outermost cylindrical surfaces of the sleeve 4, screw plug 5, and pressure rod 6 are knurled to improve the friction when tightening.

[0039] The pin 7 is installed in the small hole of the pressure rod 6 by interference fit, and is used to limit the position of the pressure rod 6.

[0040] like Figure 6As shown, when the torsion spring mounting device is in the tensioned state, L3 is zero and L2 is greater than the wire diameter of the torsion spring. At this time, by holding the sleeve, the shaft of the torsion spring 8 can be inserted into the bent section of the hook 1 through the gap between the hook 1 and the push rod 2.

[0041] like Figure 7 As shown, pressing the pressure rod 6 by hand will cause the push rod 2 to press the torsion spring shaft between the hook 1 and the push rod 2. At this time, the pressing distance is L3, where L1 is equal to the diameter of the torsion spring wire and L2 is less than the diameter of the torsion spring wire, thus achieving torsion spring clamping and preventing the torsion spring shaft from slipping out of the gap. Then, the torsion spring shaft is installed in place. After installation, the pressure on the pressure rod 6 is released. The pressure rod 6 rebounds under the action of spring force, and the gap between the hook 1 and the push rod 2 widens. Moving the sleeve 4 allows the torsion spring shaft to pass through the gap between the hook 1 and the push rod 2, realizing the retrieval of the torsion spring installation device.

[0042] L1 is greater than or equal to the bending radius R of the push rod 2, therefore the applicable torsion spring wire diameter is R to 2R. By replacing the push rod 2 with different bending radius R, torsion springs with different wire diameters can be installed.

[0043] like Figure 8 As shown, when it is necessary to keep the torsion spring clamped for a long time, after the torsion spring shaft is locked in the bent section of the hook 1, the screw plug 5 is screwed in, which drives the push rod 2 to press against the torsion spring shaft. Then the screw plug 5 is tightened. The size of L1 is equal to the diameter of the torsion spring wire, L2 is less than the diameter of the torsion spring wire, and L3 is zero. At this time, the torsion spring shaft can be clamped for a long time without the need for continuous pressing by hand.

[0044] like Figure 9 As shown, when a torsion spring needs to be installed in the narrow space of a one-way valve, a torsion spring installation device can be used to reach in and clamp the torsion spring, thereby achieving quick installation of the torsion spring.

[0045] The present invention provides a one-way valve and its torsion spring installation device, which can conveniently and quickly clamp the torsion spring shaft, realizing the rapid installation of the torsion spring in a narrow space; it has two working modes, manual pressing and twisting pressing, which can be selected according to needs; by changing the top rod with different bending section radii, torsion springs with different wire diameters can be installed.

Claims

1. A method for installing a torsion spring using a torsion spring mounting device, characterized in that, The torsion spring mounting device includes: a hook (1), a push rod (2), a sleeve (4), a spring (3), a screw plug (5), a pressure rod (6), and a pin (7); the method for installing the torsion spring is as follows: The hook (1) is inserted into the round hole from the bottom of the sleeve (4), and then the top of the hook (1) is inserted into the large waist-shaped groove of the sleeve (4), and the top of the straight section of the hook (1) is inserted into the small waist-shaped groove; the pressure rod (6) passes through the hole of the screw plug (5), the bottom thread of the pressure rod (6) is fastened to the threaded hole at the top of the top rod (2), and the pin (7) is installed into the small hole on the pressure rod (6) through interference fit. The spring (3) is installed on the assembly consisting of the top rod (2), the pressure rod (6), and the pin (7), and then they are all installed into the sleeve (4); the external thread of the screw plug (5) is screwed into the internal thread of the sleeve (4), which drives the assembly to press the spring (3), and there is a gap between the hook (1) and the top rod (2); Hold the sleeve (4) with your hand and pass the shaft of the torsion spring through the gap between the hook (1) and the top rod (2), and wed it into the curved section of the hook (1). Press the pressure rod (6) with your hand, and the top rod (2) will press the shaft of the torsion spring between the hook (1) and the top rod (2) to achieve clamping of the torsion spring. At the same time, the gap between the hook (1) and the top rod (2) will decrease to prevent the shaft of the torsion spring from slipping out. Then install the shaft of the torsion spring in place. After installation, release the pressure on the pressure rod (6). The pressure rod (6) will rebound under the action of the spring force, and the gap between the hook (1) and the top rod (2) will become larger. Move the sleeve (4) so ​​that the shaft of the torsion spring passes through the gap between the hook (1) and the top rod (2) to achieve the recovery of the torsion spring installation device.

2. The method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, When it is necessary to keep the torsion spring shaft clamped for a long time, after the torsion spring shaft is locked in the curved section of the hook (1), the screw plug (5) is screwed in to drive the push rod (2) to press on the torsion spring shaft, and then the screw plug (5) is locked to achieve long-term clamping of the torsion spring shaft.

3. The method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The hook (1) is a steel wire with a bent bottom. The bent section is a semi-circle, and the top is a boss that is perpendicular to the straight section. The width of the boss is the same as the diameter of the steel wire.

4. A method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The top of the top rod (2) is a cylinder with a threaded hole in the middle and flattened sides, which is convenient for fixing when tightening the thread.

5. A method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The sleeve (4) is a combination of two cylindrical sections. There is a small waist-shaped groove and a large waist-shaped groove at the bottom. The width of the two waist-shaped grooves is the same as the diameter of the straight section of the hook (1). The middle of the sleeve has three stepped holes with different diameters. The hole with the largest diameter at the top is a threaded hole.

6. A method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The plug (5) is a combination of a threaded cylinder and a large cylinder, with a through hole in the middle.

7. A method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The pressure bar (6) is a stepped shaft composed of four cylindrical sections. The small cylinder at the bottom is a threaded shaft, and a through hole perpendicular to the axis is opened near the top.

8. A method for installing a torsion spring using a torsion spring mounting device according to claim 1, characterized in that, The pin (7) is installed in the small hole of the pressure rod (6) by interference fit to realize the limit of the pressure rod (6).

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