CN-122014429-A - Limit position adjusting device for fuel system

CN122014429ACN 122014429 ACN122014429 ACN 122014429ACN-122014429-A

Abstract

The embodiment of the invention discloses a limiting position adjusting device for a fuel system, wherein a step mounting cavity is arranged in an adjusting nail seat of the adjusting device, one end of the step mounting cavity is provided with a nail head threaded hole, the other end of the step mounting cavity is provided with an end tooth threaded hole, an adjusting nail head is in threaded connection with the nail head threaded hole of the adjusting nail seat, the stop end of the adjusting nail head extends out of the adjusting nail seat, an end tooth part is in threaded connection with the end tooth threaded hole of the adjusting nail seat, an adjusting nail is sleeved in a central hole of the end tooth part and is sealed with the end tooth part through a sealing ring, the adjusting nail is arranged in the adjusting nail seat through the end tooth part, so that the adjusting nail can rotate in the end tooth part, one end of the adjusting nail positioned in the adjusting nail seat is in matched connection with a fork head structure of the adjusting nail head through a fork ear structure, and the rotation of the adjusting nail is used for controlling the extension or retraction of the adjusting nail head in the adjusting nail seat, namely controlling the extension amount of the adjusting nail head extending out of the adjusting nail seat, so as to control the stop position of a product on the adjusting nail head.

Inventors

OUYANG WENLONG
YANG SHAOXIONG
WANG JING
ZHANG WENXUE
DU FENG
YANG SHUAI

Assignees

中国航发西安动力控制科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251107

Claims (8)

1. The limit position adjusting device for the fuel system is characterized by comprising an adjusting nail head, an adjusting nail seat, a sealing ring and an end tooth part; The adjusting nail head is arranged in the nail head threaded hole of the adjusting nail seat in a threaded manner, the leaning-stopping end of the adjusting nail head extends out of the adjusting nail seat, and the other end of the adjusting nail head is of a fork head structure; The end tooth part is fixedly arranged in an end tooth threaded hole of the adjusting nail seat in a threaded manner, the adjusting nail is sleeved in a central hole of the end tooth part and is sealed with the end tooth part through a sealing ring, the adjusting nail is arranged in the adjusting nail seat through the end tooth part, so that the adjusting nail can rotate in the end tooth part, and one end of the adjusting nail, which is positioned in the adjusting nail seat, is connected with a fork head structure of the adjusting nail head in a matched manner through a fork ear structure.
2. The limit position adjustment device for a fuel system according to claim 1, characterized in that, The limiting position adjusting device is used for controlling the extension or retraction of the adjusting nail head in the adjusting nail seat through the rotation of the adjusting nail, namely controlling the extension amount of the adjusting nail head extending out of the adjusting nail seat so as to control the stopping position of the product on the adjusting nail head.
3. The limit position adjustment device for a fuel system according to claim 1, characterized in that, The tooth grooves are uniformly formed in the circumferential direction of the tooth surface of one side end of the end tooth component, which is matched with the thimble, and the thimble is clamped in the tooth grooves.
4. The limit position adjustment device for a fuel system of claim 3, further comprising an adjustment block, a thimble, a spring, a pin, a collar; One end of the adjusting nail, which is positioned outside the adjusting nail seat, is embedded and arranged in the central hole of the adjusting block and is fixedly connected with the adjusting block through a pin and a clamping ring, so that the adjusting nail is driven to rotate by screwing the adjusting block; At least 2 mounting holes are symmetrically formed in one side end face of the adjusting block, one end of the ejector pin is sleeved with the spring and then embedded into the mounting holes, two ends of the spring are located between the mounting holes of the adjusting block and the step end face of the ejector pin, and the ejector pin at the other end of the spring abuts against a tooth groove of the end tooth part.
5. The limit position adjustment device for a fuel system according to claim 4, wherein, The rotation angle of the thimble at the bottom of the adjusting block from one tooth groove to the other tooth groove is the minimum rotation amount of the adjusting block by screwing the adjusting block, and the adjustment precision of the adjusting block is obtained.
6. The limit position adjustment device for a fuel system according to claim 5, wherein, The limiting position adjusting device is particularly used for driving the adjusting nail to rotate through the knob adjusting block, and the adjusting nail is used for precisely controlling the extension amount of the extension adjusting nail seat of the end stop end of the adjusting nail through the rotation quantity of tooth grooves of the thimble in the end tooth part in the rotating process, so that the stop position of a product on the adjusting nail head is controlled.
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 of the end tooth part comprises the following steps: s1, the diameter of the thimble is smaller than the groove width of the matched position of the end tooth; s2, calculating the number n of the end teeth according to the control precision gamma of the product and the screw pitch p of the adjusting screw head; ; wherein, in order to ensure that each thimble can be clamped into a tooth slot, the number of teeth n of the end tooth is an integer multiple of the number of the thimble.
8. The limit position adjustment device for a fuel system according to claim 7, characterized in that, The structural parameter design scheme of the end tooth part further comprises the following steps: S3, on the end face of the end tooth component, the tooth groove depth of each end tooth is linearly reduced from the edge to the center of the fluted disc, the end tooth depth delta at the outer circle is designed according to the tooth groove depth delta 1 at the matched position of the thimble, the tooth groove depth delta 1 at the matched position is ensured to be larger than the radius R of the thimble head, and the thimble head is ensured to be effectively embedded into the tooth groove of the end tooth; ; ; ; The tooth groove depth delta 1 is determined by the number n of teeth and the diameter D 1 of the thimble matching position, and in order to ensure that the thimble is completely matched in the end tooth, the outer circle D of the end tooth is larger than the sum of the diameter D 1 of the matching position and the radius R of the thimble head, which is 2 times; s4, the tooth groove angle alpha of the end tooth is in the range of 80-90 degrees; S5, designing an included angle theta formed by the tooth bottom and the tooth top of the end tooth according to the diameter D of the outer circle of the end tooth and the depth delta of the end tooth at the outer circle, wherein the included angle theta is as follows: 。

Description

Limit position adjusting device for fuel system Technical Field The invention relates to the technical field of mechanical hydraulic feedback, in particular to a limit position adjusting device for a fuel system. Background The limit position adjusting device is a device for adjusting the limit leaning position commonly used in a fuel control system, and the existing adjusting device for a valve in the fuel system consists of an adjusting nail, an end cover and a sealing ring. The structural layout and the working principle are shown in the following figure 1. The adjusting nail is connected with the end cover through a thread structure, and the extending amount of the adjusting nail is changed through the screwing amount of the adjusting nail, so that the limit stopping position of the adjusted piece is adjusted. The adjusting nails are screwed in, the extending amount of the adjusting nails is increased, the adjusting nails are screwed out, and the extending amount of the adjusting nails is reduced. In the adjusting process of the adjusting nail, the sealing ring moves along with the adjusting nail. The existing adjusting device is simple in structure and convenient to operate, but cannot accurately control the adjusting amount in the operation process, and products needing fine adjustment can be adjusted to the required limit positions only by repeated debugging. In addition, because the sealing ring needs to reciprocate along with the adjusting nail in the adjusting process, the sealing failure is easy to be caused for products needing frequent adjustment. Disclosure of Invention The invention aims to solve the technical problems, and the embodiment of the invention provides a limit position adjusting device for a fuel system, which aims to solve the problems that the prior limit position adjusting device can be adjusted to a required limit position only by repeated debugging and the frequent adjustment easily causes the sealing failure of a product. The embodiment of the invention provides a limiting position adjusting device for a fuel system, which comprises an adjusting nail head, an adjusting nail seat, a sealing ring and an end tooth part; The adjusting nail head is arranged in the nail head threaded hole of the adjusting nail seat in a threaded manner, the leaning-stopping end of the adjusting nail head extends out of the adjusting nail seat, and the other end of the adjusting nail head is of a fork head structure; The end tooth part is fixedly arranged in an end tooth threaded hole of the adjusting nail seat in a threaded manner, the adjusting nail is sleeved in a central hole of the end tooth part and is sealed with the end tooth part through a sealing ring, the adjusting nail is arranged in the adjusting nail seat through the end tooth part, so that the adjusting nail can rotate in the end tooth part, and one end of the adjusting nail, which is positioned in the adjusting nail seat, is connected with a fork head structure of the adjusting nail head in a matched manner through a fork ear structure. Alternatively, in the limit position adjustment device for a fuel system as described above, The limiting position adjusting device is used for controlling the extension or retraction of the adjusting nail head in the adjusting nail seat through the rotation of the adjusting nail, namely controlling the extension amount of the adjusting nail head extending out of the adjusting nail seat so as to control the stopping position of the product on the adjusting nail head. Alternatively, in the limit position adjustment device for a fuel system as described above, The tooth grooves are uniformly formed in the circumferential direction of the tooth surface of one side end of the end tooth component, which is matched with the thimble, and the thimble is clamped in the tooth grooves. Optionally, the limit position adjusting device for the fuel system further comprises an adjusting block, a thimble, a spring, a pin and a clamping ring; One end of the adjusting nail, which is positioned outside the adjusting nail seat, is embedded and arranged in the central hole of the adjusting block and is fixedly connected with the adjusting block through a pin and a clamping ring, so that the adjusting nail is driven to rotate by screwing the adjusting block; At least 2 mounting holes are symmetrically formed in one side end face of the adjusting block, one end of the ejector pin is sleeved with the spring and then embedded into the mounting holes, two ends of the spring are located between the mounting holes of the adjusting block and the step end face of the ejector pin, and the ejector pin at the other end of the spring abuts against a tooth groove of the end tooth part. Alternatively, in the limit position adjustment device for a fuel system as described above, The rotation angle of the thimble at the bottom of the adjusting block from one tooth groove to the other tooth groove is the minimum rotation amount of the adj