Sealing structure of impeller and cylinder body

Abstract

The sealing structure comprises impeller teeth (1) distributed in the circumferential direction of the impeller, a transverse groove is formed in the center line of each impeller tooth (1), sealing pieces (11) are installed in the transverse grooves, and springs are arranged at the bottoms of the sealing pieces; when the impeller teeth (1) are matched with the inner wall face of the cylinder body, the sealing piece (11) tends to be ejected outwards. The matching position of the impeller and the cylinder body is of a structure capable of stretching in a small range, and the spring provides pre-tightening force so that the sealing piece can be kept in contact with the cylinder body.

Description

Technical Field

[0001] The invention relates to a sealing structure of an impeller and a cylinder of a pneumatic power device. Background Art

[0002] Pneumatic power units use a continuous flow of gas as the working fluid to drive the impeller. One of the main factors affecting efficiency is the seal between the impeller and the inner wall of the cylinder. Existing technology requires precision machining to ensure a sufficiently tight fit between the rotating impeller edge and the inner contour of the cylinder. Furthermore, the expansion factor caused by temperature fluctuations during use increases machining difficulty and reduces efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a structure that can better solve the problems of processing difficulty, sealing and efficiency of the impeller and the cylinder body.

[0004] The technical solution of the present invention:

[0005] A sealing structure for an impeller and a cylinder body includes impeller teeth 1 distributed along the circumference of the impeller, a transverse groove is opened on the center line of each impeller tooth 1, a sealing plate 11 is installed in the transverse groove and a spring is arranged at the bottom; when the impeller teeth 1 are engaged with the inner wall surface of the cylinder body, the sealing plate 11 has a tendency to be pushed outward.

[0006] The cross section of the transverse groove is convex, and the cross section of the sealing piece 11 is T-shaped. The shape of the transverse groove limits the maximum position of the sealing piece 11 that can be pushed outward.

[0007] A push pin 111 is provided at the bottom of the sealing sheet 11 , and a guide groove is provided at the bottom of the transverse groove. The push pin 111 is fitted with a spring and then inserted into the guide groove.

[0008] The hardness of the sealing sheet 11 is lower than the hardness of the inner wall of the cylinder.

[0009] Vertical grooves are provided on both sides of the impeller teeth 1, and side sealing pieces 12 are installed in the vertical grooves and springs are provided at the bottom; when the impeller teeth 1 cooperate with the inner wall of the cylinder body, the side sealing pieces 12 tend to be pushed outward.

[0010] The two ends of the sealing sheet 11 cooperate with the inner sides of the left and right side sealing sheets 12 , and the lateral displacement of the sealing sheet 11 is limited by the side sealing sheets 12 .

[0011] The lower side of the side sealing piece 12 cooperates with the limit block 3), which is installed in the vertical groove by the bolt 2. The bolt 2 limits the maximum outward movement of the limit block 3, and the limit block 3 limits the maximum inward movement of the side sealing piece 12.

[0012] A push pin 111 is provided on the inner side of the side sealing piece 12. The push pin 111 is sleeved with a spring and inserted into the guide groove of the vertical groove.

[0013] There is a step hole in the center of the limit block 3, a sleeve is inserted into the step hole, a spring is set on the part of the sleeve that passes through the step hole, and the bolt 2 passes through the sleeve and is screwed into the bolt hole in the vertical slot.

[0014] The hardness of the side sealing piece 12 and the limiting block 3 is less than the hardness of the inner wall of the cylinder body.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] 1. The joint between the impeller and the cylinder body is a structure that can be expanded and contracted in a small range. The pre-tightening force provided by the spring can keep the sealing piece in contact with the cylinder body, which reduces the processing accuracy.

[0017] 2. Use softer metal to install on the impeller and contact with the cylinder body. The sealing piece, side sealing piece and limit block complete the final shape of the seal during the movement contact with the cylinder body and under the wear of the cylinder body.

[0018] 3. The sealing sheet can be easily replaced after being damaged. There is no need to replace the entire impeller, only the metal sheet needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the impeller.

[0020] Figure 2 A top view of the impeller.

[0021] Figure 3 for Figure 2 A-direction sectional view.

[0022] Figure 4 yes Figure 3 B-direction cross-sectional view.

[0023] Figure 5 This is a cross-sectional view of the impeller installed in the cylinder body. DETAILED DESCRIPTION

[0024] Example 1:

[0025] like Figure 3 A transverse groove with a convex cross-section is defined along the centerline of each impeller tooth (1). A T-shaped sealing piece (11) is inserted into the groove, and a spring structure is positioned at its base. When the impeller tooth (1) engages the inner wall of the cylinder, the sealing piece (11) tends to push outward. The spring structure is installed by creating a guide groove at the bottom of the groove. A spring-loaded ejector pin (111) is inserted into the guide groove. A tool is used to press down the ejector pin (111) before inserting the sealing piece (11).

[0026] The hardness of the sealing sheet 11 is less than the hardness of the inner wall of the cylinder body, and can be made of metal such as copper or aluminum. The front end of the sealing sheet 11 can be not processed and formed according to the shape of the cylinder body, but a sufficient length can be reserved. After the impeller is installed into the rigid body, the impeller is rotated, and the sealing sheet 11 is ground into a matching shape and size using the inner wall of the cylinder body.

[0027] Example 2:

[0028] like Figure 1 This embodiment adds sealing structures on both sides on the basis of embodiment 1. A transverse groove is provided on the center line of each impeller tooth 1 of the impeller. Vertical grooves are also provided on both sides of each impeller tooth 1. The vertical grooves are connected to the transverse grooves. There are two symmetrical guide grooves at the bottom of the transverse groove, and a guide groove and a bolt hole are provided on the inner bottom edge of the vertical groove. The cross section of the transverse groove is convex. After the two ejector pins 111 are fitted with springs, they are inserted into the guide grooves of the transverse grooves. Use a tool to press the ejector pins 111 first, and then insert the sealing sheet 11. Afterwards, the ejector pins 111 and springs are installed in the vertical grooves on both sides, and the side sealing sheet 12 is placed. The cross section of the side sealing sheet 12 is as shown below. Figure 4 In the structure shown, the upper pressure plate blocks both sides of the sealing plate 11, while the lower pressure plate is pressed by the stopper 3. The stopper 3 is a disc-shaped structure with a stepped hole in the center. A sleeve with an edge is inserted into the stepped hole, a spring is attached to the sleeve, and a bolt 2 is inserted into the sleeve and screwed into the bolt hole in the vertical slot. The stopper 3 can move within a certain range within the sleeve's constraints. At the same time, the stopper 3 also limits the maximum inward movement of the side sealing plate 12, acting as a head seal.

[0029] The side sealing piece (12) and the sealing piece (11) limiting block (3) are both made of relatively soft metals such as copper and aluminum, and are pre-made to a sufficient thickness. Then, the impeller is installed into the rigid body and the impeller is rotated. The side sealing piece (12) and the sealing piece (11) limiting block (3) are ground into matching shapes and sizes using the inner wall surface of the cylinder body.

Claims

1. An impeller and cylinder sealing structure, comprising impeller teeth (1) distributed along the circumference of the impeller, characterized in that: A transverse groove is provided on the center line of each impeller tooth (1), a sealing sheet (11) is installed in the transverse groove and a spring is provided at the bottom; when the impeller tooth (1) is engaged with the inner wall surface of the cylinder body, the sealing sheet (11) has a tendency to be pushed outward.

2. The impeller and cylinder sealing structure according to claim 1, characterized in that: The cross section of the transverse groove is in a convex shape, and the cross section of the sealing sheet (11) is in a T shape. The shape of the transverse groove limits the maximum position of the sealing sheet (11) that can be pushed outward.

3. The impeller and cylinder sealing structure according to claim 1, characterized in that: The bottom of the sealing sheet (11) is provided with a push pin (111), the bottom of the transverse groove is provided with a guide groove, and the push pin (111) is inserted into the guide groove after being fitted with a spring.

4. The impeller and cylinder sealing structure according to claim 1, characterized in that: The hardness of the sealing sheet (11) is less than the hardness of the inner wall of the cylinder body.

5. The impeller and cylinder sealing structure according to any one of claims 1 to 4, characterized in that: Vertical grooves are provided on both sides of the impeller teeth (1), and side sealing pieces (12) are installed in the vertical grooves and springs are provided at the bottom; when the impeller teeth (1) are engaged with the inner wall surface of the cylinder body, the side sealing pieces (12) have a tendency to be pushed outward.

6. The impeller and cylinder sealing structure according to claim 5, characterized in that: The two ends of the sealing sheet (11) cooperate with the inner sides of the left and right side sealing sheets (12), and the lateral displacement of the sealing sheet (11) is limited by the side sealing sheets (12). At the same time, the maximum outward movement position of the side sealing sheets (12) is limited by the sealing sheet (11).

7. The impeller and cylinder sealing structure according to claim 5, characterized in that: The lower side of the side sealing piece (12) cooperates with the limiting block (3), and the limiting block (3) is installed in the vertical groove through the bolt (2), and the bolt (2) limits the maximum position of the limiting block (3) to move outward.

8. The impeller and cylinder sealing structure according to claim 5, characterized in that: A top pin (111) is provided on the inner side of the side sealing piece (12). The top pin (111) is inserted into the guide groove of the vertical groove after being fitted with a spring.

9. The impeller and cylinder sealing structure according to claim 5, characterized in that: The limiting block (3) has a stepped hole at its center, a sleeve is inserted into the stepped hole, a spring is fitted on the portion of the sleeve that passes through the stepped hole, and a bolt (2) passes through the sleeve and is screwed into the bolt hole in the vertical slot.

10. The impeller and cylinder sealing structure according to claim 5, characterized in that: The hardness of the side sealing piece (12) is less than the hardness of the inner wall of the cylinder body.

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