Limit position adjusting device for fuel system

Abstract

The embodiment of the invention discloses a limiting position adjusting device for a fuel system, a step mounting cavity is arranged in an adjusting screw seat of the adjusting device, a screw head threaded hole is formed in one end of the step mounting cavity, and an end tooth threaded hole is formed in the other end of the step mounting cavity; the adjusting nail head is installed in a nail head threaded hole of the adjusting nail base in a screwed mode, and the stopping end of the adjusting nail head extends out of the adjusting nail base. The end tooth component is fixedly installed in an end tooth threaded hole of the adjusting screw seat in a threaded connection mode, the adjusting screw is installed in a center hole of the end tooth component in a sleeved mode, the adjusting screw and the end tooth component are sealed through the sealing ring, and the adjusting screw is installed in the adjusting screw seat through the end tooth component so that the adjusting screw can rotate in the end tooth component. The end, located in the adjusting nail base, of the adjusting nail is connected with the fork head structure of the adjusting nail head in a matched mode through a fork lug structure. The adjusting nail head is controlled to stretch out or retract back in the adjusting nail seat through rotation of the adjusting nail, namely the stretching amount of the adjusting nail head stretching out of the adjusting nail seat is controlled, so that the stopping position of a product on the adjusting nail head is controlled.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of mechanical hydraulic feedback technology, and particularly to a limit position adjustment device for a fuel system. Background Technology

[0002] Limit position adjustment devices are commonly used in fuel control systems to adjust the limit stop positions. Existing adjustment devices for valves in fuel systems consist of an adjusting pin, an end cap, and a sealing ring. Their structural layout and working principle are as follows: Figure 1 As shown.

[0003] The adjusting pin is connected to the end cap via a threaded structure. The amount of adjustment pin protrusion changes by the amount it is screwed in, thereby adjusting the limit stop position of the adjusted part. Screwing the adjusting pin in increases its protrusion, while unscrewing it decreases its protrusion. During the adjustment process, the sealing ring moves along with the adjusting pin.

[0004] The existing adjustment device described above has a simple structure and is easy to operate, but it cannot precisely control the adjustment amount during operation. For products requiring fine adjustment, repeated adjustments are necessary to reach the required limit position. In addition, since the sealing ring needs to reciprocate with the adjusting pin during adjustment, it can easily lead to seal failure for products that require frequent adjustments. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides a limit position adjustment device for a fuel system, which solves the problems that existing limit position adjustment devices require repeated adjustments to reach the required limit position, and that frequent adjustments can easily lead to product seal failure.

[0006] The technical solution of the present invention: The present invention provides a limit position adjustment device for a fuel system, comprising: an adjustment pin head, an adjustment pin, an adjustment pin seat, a sealing ring, and an end tooth component; The adjusting pin holder has a stepped mounting cavity inside, with a pin head threaded hole at one end and an end tooth threaded hole at the other end. The adjusting pin head is screwed into the pin head threaded hole of the adjusting pin holder, with the stop end of the adjusting pin head extending out of the adjusting pin holder and the other end being a fork head structure. The end tooth component is screwed and fixedly installed in the end tooth threaded hole of the adjusting pin seat. The adjusting pin is fitted in the center hole of the end tooth component and sealed with the end tooth component by a sealing ring. The adjusting pin is installed in the adjusting pin seat through the end tooth component, so that the adjusting pin can rotate in the end tooth component. One end of the adjusting pin located in the adjusting pin seat is connected to the fork head structure of the adjusting pin head through a fork lug structure.

[0007] Optionally, in the limit position adjustment device for the fuel system as described above, The limit position adjustment device is used to control the extension or retraction of the adjusting pin head in the adjusting pin seat by rotating the adjusting pin, that is, to control the extension amount of the adjusting pin head out of the adjusting pin seat, so as to control the stop position of the product on the adjusting pin head.

[0008] Optionally, in the limit position adjustment device for the fuel system as described above, The toothed component has uniformly spaced tooth grooves on one side of its toothed surface that mates with the ejector pin, and the ejector pin is held in the tooth grooves.

[0009] Optionally, the limit position adjustment device for the fuel system described above also includes: an adjusting block, a push pin, a spring, a pin, and a retaining ring; The adjusting pin is located at one end outside the adjusting pin seat and is embedded in the center hole of the adjusting block. It is fixedly connected to the adjusting block by a pin and a retaining ring, so that the adjusting pin can be rotated by turning the adjusting block. The adjustment block has at least two mounting holes symmetrically arranged on one side end face. After the spring is fitted onto one end of the ejector pin, it is embedded in the mounting hole. The two ends of the spring are located between the mounting hole of the adjustment block and the stepped end face of the ejector pin, and the ejector pin at the other end of the spring abuts against the tooth groove of the end tooth component.

[0010] Optionally, in the limit position adjustment device for the fuel system as described above, The adjustment accuracy is determined by rotating the adjusting block so that the rotation angle of the pin at its bottom from one tooth groove to another is the minimum rotation amount of the adjusting block.

[0011] Optionally, in the limit position adjustment device for the fuel system as described above, The limit position adjustment device is specifically used to drive the adjustment pin to rotate through the knob adjustment block. During the rotation, the number of rotations of the tooth groove in the end tooth component by the pin is used to precisely control the extension amount of the adjustment pin stop end out of the adjustment top seat, thereby controlling the stop position of the product on the adjustment pin head.

[0012] Optionally, in the limit position adjustment device for the fuel system as described above, The structural parameter design scheme for the end tooth component includes: S1, the diameter of the ejector pin is smaller than the groove width at the end tooth mating point; S2, calculate the number of teeth n of the end teeth based on the product's control precision γ and the thread pitch p of the adjusting nail head; ; To ensure that each ejector pin can be engaged in the tooth groove, the number of teeth n at the end is an integer multiple of the number of ejector pins.

[0013] Optionally, in the limit position adjustment device for the fuel system as described above, The structural parameter design scheme for the end tooth component also includes: S3, on the end face of the end tooth component, the tooth groove depth of each end tooth decreases linearly from the edge of the tooth disk to the center. The tooth depth δ at the outer circle is designed according to the tooth groove depth δ1 at the position of the ejector pin mating. It should be ensured that the tooth groove depth δ1 at the mating position is greater than the radius R of the ejector pin head, and it is required to ensure that the ejector pin head can be effectively embedded in the tooth groove of the end tooth. ; ; ; The tooth groove depth δ1 is determined by the number of teeth n and the diameter D1 of the ejector pin mating position. In order to ensure that the ejector pin is fully mated in the end tooth, the outer circle D of the end tooth should be greater than the sum of the mating position diameter D1 and twice the ejector pin head radius R. S4, the tooth groove angle α of the end teeth is in the range of 80° to 90°; S5, the angle θ formed by the tooth root and tooth tip of the end tooth is designed based on the outer diameter D of the end tooth and the tooth depth δ at the outer circle, and should be: .

[0014] The beneficial effects of this invention are as follows: To meet the requirements of fine-tuning and high-frequency adjustment of products, this invention provides a limit position adjustment device for a fuel system. By controlling the rotation of the adjusting pin, the amount of extension or retraction of the adjusting pin head within the adjusting pin holder can be controlled, i.e., the amount of extension of the adjusting pin head beyond the adjusting pin holder can be controlled, thereby controlling the stop position of the product on the adjusting pin head. This limit position adjustment device ensures that the sealing ring does not reciprocate during adjustment, guaranteeing fine-tuning and high sealing reliability. It also features a simple structure, convenient adjustment, and small size.

[0015] In addition, the present invention makes a revolutionary improvement on the existing adjustment device. By adopting a toothed structure with end teeth and pins, a structural layout for precise control of the adjustment amount is achieved, thus optimizing the size and structure of the device. The plug structure of the adjustment pin and adjustment pin seat effectively improves the reliability of the sealing ring.

[0016] The technical solution provided by this invention realizes a leapfrog development of adjustment devices from coarse adjustment devices to fine adjustment devices. While achieving lightweight structure, this invention significantly improves the sealing reliability of the product, provides theoretical and experimental basis for the structural design of subsequent fine adjustment devices, has significant economic benefits and application value, and is of great significance to the application and development of aviation and aerospace products. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of a position adjustment device in the prior art; Figure 2 This is a schematic diagram of the overall structure of a limit position adjustment device for a fuel system provided in an embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the end teeth in the limit position adjustment device for a fuel system provided in the embodiment shown. Figure 4 for Figure 3 A schematic diagram of the structural dimensions of the end teeth provided in the illustrated embodiment; Figure 4 Figure a shows a cross-sectional view of the end tooth, and Figure b shows the tooth groove angle α of the end tooth. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0020] As explained in the background section, existing adjustment devices cannot precisely control the adjustment amount during operation. For products requiring fine adjustments, repeated adjustments are necessary to reach the desired limit position. Furthermore, because the sealing ring reciprocates with the adjusting pin during adjustment, it can easily lead to seal failure for products requiring frequent adjustments.

[0021] To ensure adjustment accuracy and reliability, the existing adjustment device structure can no longer meet the adjustment requirements. It is necessary to design the structure to control the adjustment amount and improve the reliability of the sealing structure to meet the existing adjustment requirements. In this regard, the present invention provides a limit position adjustment device for a fuel system.

[0022] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0023] Figure 2 This is a schematic diagram of the overall structure of a limit position adjustment device for a fuel system provided in an embodiment of the present invention. The limit position adjustment device for a fuel system provided in this embodiment of the present invention includes: an adjusting pin head, an adjusting pin, an adjusting pin seat, a sealing ring, and an end tooth component.

[0024] like Figure 2In the structure of the limit position adjustment device shown, the adjusting pin seat is provided with a stepped mounting cavity. One end of the stepped mounting cavity is provided with a pin head threaded hole, and the other end is provided with an end tooth threaded hole. The adjusting pin head is screwed into the pin head threaded hole of the adjusting pin seat. The stop end of the adjusting pin head extends out of the adjusting pin seat, and its other end is a fork head structure. The end tooth component is screwed and fixedly installed in the end tooth threaded hole of the adjusting pin seat. The adjusting pin is fitted in the center hole of the end tooth component and sealed with the end tooth component by a sealing ring. The adjusting pin is installed in the adjusting pin seat through the end tooth component, so that the adjusting pin can rotate in the end tooth component. One end of the adjusting pin located in the adjusting pin seat is connected to the fork head structure of the adjusting pin head through a fork lug structure.

[0025] The adjustment principle of the limit position adjustment device provided in this embodiment of the invention is as follows: by rotating the adjustment pin, the extension or retraction of the adjustment pin head in the adjustment pin seat is controlled, that is, the extension amount of the adjustment pin head out of the adjustment pin seat is controlled, so as to control the stop position of the product on the adjustment pin head.

[0026] In one embodiment of the present invention, the toothed component has uniformly arranged tooth grooves on one side of the toothed surface that mates with the ejector pin, and the ejector pin is stuck in the tooth grooves.

[0027] In one implementation of this invention, the limit position adjustment device further includes: an adjustment block, a pin, a spring, a pin, and a retaining ring.

[0028] In this implementation, one end of the adjusting pin, located outside the adjusting pin holder, is embedded in the central hole of the adjusting block and is fixedly connected to the adjusting block by a pin and a retaining ring, so that the adjusting pin can be rotated by turning the adjusting block.

[0029] In this implementation, at least two mounting holes are symmetrically provided on one side end face of the adjustment block. After a spring is fitted onto one end of the ejector pin, it is embedded in the mounting hole. The two ends of the spring are located between the mounting hole of the adjustment block and the stepped end face of the ejector pin, and the ejector pin at the other end of the spring abuts against the tooth groove of the end tooth component.

[0030] In one implementation of this invention, the minimum rotation angle of the adjusting block is the angle at which the bottom pin rotates from one tooth groove to another by rotating the adjusting block, which is the adjustment accuracy of the adjusting block.

[0031] The limit position adjustment device provided by the present invention is specifically used to drive the adjustment pin to rotate by a knob adjustment block. During the rotation, the number of rotations of the tooth groove in the end tooth component by the pin is used to precisely control the extension amount of the adjustment pin stop end extending out of the adjustment top seat, thereby controlling the stop position of the product on the adjustment pin head.

[0032] Traditional adjustment device structures can no longer meet adjustment requirements. Therefore, this invention designs an adjustment device structure to precisely control the adjustment amount and improve the reliability of the sealing structure to meet existing adjustment needs. To meet the requirements of fine-tuning and high-frequency adjustments, this invention provides a limit position adjustment device for a fuel system. By controlling the rotation of the adjusting pin, the amount of extension or retraction of the adjusting pin head within the adjusting pin holder can be controlled, i.e., the amount of extension of the adjusting pin head beyond the adjusting pin holder is controlled, thereby controlling the stop position of the product on the adjusting pin head. Using this limit position adjustment device, the sealing ring does not reciprocate during adjustment, ensuring fine-tuning and high sealing reliability, while also featuring simple structure, convenient adjustment, and small size.

[0033] In addition, the present invention makes a revolutionary improvement on the existing adjustment device. By adopting a toothed structure with end teeth and pins, a structural layout for precise control of the adjustment amount is achieved, thus optimizing the size and structure of the device. The plug structure of the adjustment pin and adjustment pin seat effectively improves the reliability of the sealing ring.

[0034] The technical solution provided by this invention realizes a leapfrog development of adjustment devices from coarse adjustment devices to fine adjustment devices. While achieving lightweight structure, this invention significantly improves the sealing reliability of the product, provides theoretical and experimental basis for the structural design of subsequent fine adjustment devices, has significant economic benefits and application value, and is of great significance to the application and development of aviation and aerospace products.

[0035] Implementation Example like Figure 2 As shown, this embodiment provides a limit position adjustment device for a fuel system, including: an adjustment head, an adjustment pin, an adjustment pin seat, a sealing ring, a push pin, an end tooth component, a spring, an adjustment block, a pin, and a retaining ring.

[0036] The function of the adjusting pin holder is to install adjusting pin heads, adjusting pins, end teeth components, and other structures. The function of the adjusting pin head is to control the ultimate stop position. By controlling the extension of the adjusting pin seat at the stop end of the adjusting pin head, the stop position of the product on the adjusting pin head can be controlled. The middle part of the adjusting pin head is fixedly installed in the threaded hole of the adjusting pin seat through a threaded structure, and the other end of the adjusting pin head is connected to the adjusting pin through a fork structure.

[0037] The function of the adjusting pin is to control the extension or retraction of the adjusting pin head. By turning the adjusting block, the adjusting pin head is rotated within the threaded hole of the adjusting pin seat by the fork structure. When rotated clockwise, the adjusting pin head extends; when rotated counterclockwise, the adjusting pin head retracts.

[0038] The specific installation structure of the adjusting pin is as follows: the adjusting pin is fitted inside the end tooth component and sealed with the end tooth component by a sealing ring. The adjusting pin is installed in the threaded hole of the end tooth component of the adjusting pin seat through the end tooth component, and the adjusting pin can rotate inside the end tooth component. One end of the adjusting pin located in the adjusting pin seat is connected to the fork head structure of the adjusting pin head through the fork lug structure, and the other end is embedded in the center hole of the adjusting block and fixedly connected to the adjusting block by a pin and a retaining ring. During adjustment, the adjusting pin is rotated by the knob adjusting block, thereby controlling the extension or retraction of the adjusting pin head.

[0039] The mating structure between the end tooth component and the ejector pin serves to control the minimum adjustment amount. The end tooth component is fixedly installed in the adjusting pin seat by its external thread, and the end tooth component is fixed in the adjusting pin seat by sealing fastener; the ejector pin is assembled in the adjusting block, and the ejector pin is set in the mounting hole of the adjusting block by a spring, so that the elastic force provided by the spring pushes the ejector pin against the tooth groove of the end tooth component.

[0040] The end tooth component has uniform tooth grooves machined on its surface. The ejector pin is stuck in the tooth groove. The rotation angle of the ejector pin from one tooth groove to another is the minimum rotation amount of the adjusting block, which is the adjustment accuracy of the adjusting block.

[0041] The design process of the structural parameters of each structure in this implementation example is explained below.

[0042] See end tooth structure Figure 3 As shown, the key parameters for end tooth design are listed below. Figure 4 As shown, Figure 4 Figure a shows a cross-sectional view of the end tooth, and Figure b shows the tooth groove angle α of the end tooth.

[0043] a) The diameter of the ejector pin should be smaller than the groove width at the end tooth mating point; b) The number of teeth n at the end is designed based on the product's control precision γ and the thread pitch p of the adjusting screw head, and should ensure that: ; The thread pitch p of the adjusting nail head is a known quantity, and n is a design parameter. It is required to ensure that the designed n satisfies the above formula. Since the ejector pins are symmetrically distributed, in order to ensure that all ejector pins can be inserted into the tooth groove, the number of teeth n should be an integer multiple of the number of ejector pins. c) On the end face of the end tooth component, the tooth tips of each end tooth are located on the same plane, and the tooth groove depth of each end tooth decreases linearly from the edge of the tooth disk to the center. The end tooth depth δ at the outer circle is designed according to the tooth groove depth δ1 at the ejector pin mating position. It should be ensured that the tooth groove depth δ1 at the mating position is greater than the ejector pin head radius R, so that the ejector pin head can be effectively embedded in the tooth groove of the end tooth. ; ; ; The tooth groove depth δ1 is determined by the number of teeth n and the diameter D1 of the ejector pin mating position. In order to ensure that the ejector pin is fully mated in the end tooth, the outer circle D of the end tooth should be greater than the sum of the mating position diameter D1 and twice the ejector pin head radius R.

[0044] d) The tooth groove angle α of the end teeth should be in the range of 80° to 90°.

[0045] f) The angle θ formed by the tooth root and tooth tip of the end tooth is designed based on the outer diameter D of the end tooth and the tooth depth δ at the outer circle, and should be: .

[0046] The limit position adjustment device provided in this embodiment of the invention, which enables highly reliable and precise adjustment, has been used on a certain type of fuel regulator and has been finalized, thus well meeting the product's usage requirements.

[0047] Here is a specific example: For product type one, the required adjustment accuracy γ is 0.02mm, the adjusting screw pitch is 1mm, the number of ejector pins is 2, the ejector pin head radius is 1mm, and the tooth groove angle α is 80°. Therefore: ; Substitute parameters: , n≥50, n takes an integer multiple of 2, 50.

[0048] ; Substitute parameters: ; D1 > 26.72, D1 is taken as 27mm, δ1 = 1mm.

[0049]

[0050] Substitute parameters: , D is 30mm.

[0051] ; Substitute parameters: δ is taken as 1.2mm.

[0052] ; Substitute parameters: θ is taken as 5°.

[0053] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A limit position adjustment device for a fuel system, characterized in that, include: Adjusting screw head, adjusting screw, adjusting screw seat, sealing ring and end tooth components; The adjusting pin holder has a stepped mounting cavity inside, with a pin head threaded hole at one end and an end tooth threaded hole at the other end. The adjusting pin head is screwed into the pin head threaded hole of the adjusting pin holder, with the stop end of the adjusting pin head extending out of the adjusting pin holder and the other end being a fork head structure. The end tooth component is screwed and fixedly installed in the end tooth threaded hole of the adjusting pin seat. The adjusting pin is fitted in the center hole of the end tooth component and sealed with the end tooth component by a sealing ring. The adjusting pin is installed in the adjusting pin seat through the end tooth component, so that the adjusting pin can rotate in the end tooth component. One end of the adjusting pin located in the adjusting pin seat is connected to the fork head structure of the adjusting pin head through a fork lug structure.

2. The limit position adjustment device for a fuel system according to claim 1, characterized in that, The limit position adjustment device is used to control the extension or retraction of the adjusting pin head in the adjusting pin seat by rotating the adjusting pin, that is, to control the extension amount of the adjusting pin head out of the adjusting pin seat, so as to control the stop position of the product on the adjusting pin head.

3. The limit position adjustment device for a fuel system according to claim 1, characterized in that, The toothed component has uniformly spaced tooth grooves on one side of its toothed surface that mates with the ejector pin, and the ejector pin is held in the tooth grooves.

4. The limit position adjustment device for a fuel system according to claim 3, characterized in that, Also includes: Adjusting block, ejector pin, spring, pin, retaining ring; The adjusting pin is located at one end outside the adjusting pin seat and is embedded in the center hole of the adjusting block. It is fixedly connected to the adjusting block by a pin and a retaining ring, so that the adjusting pin can be rotated by turning the adjusting block. The adjustment block has at least two mounting holes symmetrically arranged on one side end face. After the spring is fitted onto one end of the ejector pin, it is embedded in the mounting hole. The two ends of the spring are located between the mounting hole of the adjustment block and the stepped end face of the ejector pin, and the ejector pin at the other end of the spring abuts against the tooth groove of the end tooth component.

5. The limit position adjustment device for a fuel system according to claim 4, characterized in that, The adjustment accuracy is determined by rotating the adjusting block so that the rotation angle of the pin at its bottom from one tooth groove to another is the minimum rotation amount of the adjusting block.

6. The limit position adjustment device for a fuel system according to claim 5, characterized in that, The limit position adjustment device is specifically used to drive the adjustment pin to rotate through the knob adjustment block. During the rotation, the number of rotations of the tooth groove in the end tooth component by the pin is used to precisely control the extension amount of the adjustment pin stop end out of the adjustment pin seat, thereby controlling the stop position of the product on the adjustment pin head.

7. The limit position adjustment device for a fuel system according to any one of claims 3 to 6, characterized in that, The structural parameter design scheme for the end tooth component includes: S1, the diameter of the ejector pin is smaller than the groove width at the end tooth mating point; S2, calculate the number of teeth n of the end teeth based on the product's control precision γ and the thread pitch p of the adjusting nail head; ； To ensure that each ejector pin can be engaged in the tooth groove, the number of teeth n at the end is an integer multiple of the number of ejector pins.

8. The limit position adjustment device for a fuel system according to claim 7, characterized in that, The structural parameter design scheme for the end tooth component also includes: S3, on the end face of the end tooth component, the tooth groove depth of each end tooth decreases linearly from the edge of the tooth disk to the center. The tooth depth δ at the outer circle is designed according to the tooth groove depth δ1 at the position of the ejector pin mating. It should be ensured that the tooth groove depth δ1 at the mating position is greater than the radius R of the ejector pin head, and it is required to ensure that the ejector pin head can be effectively embedded in the tooth groove of the end tooth. ； ； ； The tooth groove depth δ1 is determined by the number of teeth n and the diameter D1 of the ejector pin mating position. In order to ensure that the ejector pin is fully mated in the end tooth, the outer circle D of the end tooth should be greater than the sum of the mating position diameter D1 and twice the ejector pin head radius R. S4, the tooth groove angle α of the end teeth is in the range of 80° to 90°; S5, the angle θ formed by the tooth root and tooth tip of the end tooth is designed based on the outer diameter D of the end tooth and the tooth depth δ at the outer circle, and should be: .

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