Sealing structure used between cylinder body and cylinder cover of air compressor

Abstract

The utility model belongs to the field of sealing ring devices, and particularly discloses a sealing structure used between a cylinder body and a cylinder cover of an air compressor, which comprises the cylinder body, the cylinder cover, a bolt and an O-shaped ring, the lower end of the cylinder cover is inserted into a groove of the cylinder body, the cylinder cover and the cylinder body are fastened through the bolt, a chamfer A with a triangular section is arranged at an orifice of an inner hole of the cylinder body, and the O-shaped ring is arranged in the cylinder body. An O-shaped ring is embedded in the chamfer A, the inner diameter of the O-shaped ring is smaller than the outer diameter of the insertion end of the lower end of the cylinder cover, and the outer diameter of the O-shaped ring extends to the outside of an orifice of the inner hole of the cylinder body; the sealing structure is arranged at the joint of the cylinder body and the cylinder cover, the sealing effect is achieved by utilizing the gap of the chamfer and combining the elastic deformation of the O-shaped ring during installation, and the phenomenon that the O-shaped ring is damaged due to the fact that the installation gap is too small when the cylinder body and the cylinder cover are installed can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the field of sealing ring devices, and particularly relates to a sealing structure for between the cylinder block and the cylinder head of an air compressor. Background Art

[0002] In the prior art, sealing devices are generally divided into radial sealing and axial sealing. As Figure 4 shown, this kind of sealing structure generally uses the method of installing an O-ring in a groove for sealing. This method installs the radial O-ring and the axial O-ring separately. Although this method can ensure the sealing effect, when installing the O-ring, it is necessary to squeeze the O-ring to install it into the installation hole or groove. At this time, the O-ring is extremely easy to be damaged due to friction with the sealing surface and lose the sealing function.

[0003] When installing the sealing structure between the cylinder block and the cylinder head of an air compressor (as Figure 4 shown), the lower end of the cylinder head needs to be inserted into the groove of the cylinder block. In the prior art, the O-ring is generally installed in the groove on the side wall of the cylinder head. During the installation process of the cylinder head, the O-ring rubs against the inner wall of the groove of the cylinder block, which is extremely easy to damage the O-ring in the groove, causing air leakage and affecting the quality of the compressor. Summary of the Utility Model

[0004] Aiming at the problems existing in the background art, the utility model provides a sealing structure for between the cylinder block and the cylinder head of an air compressor.

[0005] To achieve the above object, the utility model adopts the following technical solutions: A sealing structure for between the cylinder block and the cylinder head of an air compressor, including a cylinder block, a cylinder head, a bolt and an O-ring. The lower end of the cylinder head is inserted into the groove of the cylinder block, and the cylinder head and the cylinder block are fastened by bolts. A chamfer A with a triangular cross-section is provided at the orifice of the inner hole of the cylinder block, and an O-ring is embedded on the chamfer A. The inner diameter of the O-ring is smaller than the outer diameter of the insertion end at the lower end of the cylinder head, and the outer diameter of the O-ring extends outside the orifice of the inner hole of the cylinder block.

[0006] The chamfer A is c*45°.

[0007] The cross-sectional diameter of the O-ring is a, and a is not less than 1.1*c and not greater than .

[0008] The O-ring is sleeved on the corner at the lower end of the cylinder head and contacts the inclined surface of the chamfer A.

[0009] The diameter a of the O-ring is c*1.2.

[0010] Advantages of the present utility model: The present utility model provides a sealing structure for between the cylinder block and the cylinder head of an air compressor. This sealing structure is arranged at the junction between the cylinder block and the cylinder head. During installation, by utilizing the clearance of the chamfer and combining with the elastic deformation of the O-ring, the sealing effect is achieved, and it can also effectively prevent the damage of the O-ring caused by too small installation clearance when installing the cylinder block and the cylinder head. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the present utility model.

[0012] Figure 2 It is an enlarged view of part A.

[0013] Figure 3 It is a cross-sectional view of the O-ring.

[0014] Figure 4 It is a schematic diagram of the prior art.

[0015] Figure 5 It is an enlarged view of part B.

[0016] In the figure: 1. Cylinder block, 2. Cylinder head, 3. Bolt, 4. O-ring. Detailed Embodiment

[0017] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments; based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0018] The following combines the attached Figures 1-5 Make a further detailed elaboration on the specific embodiment of the present utility model: A sealing structure for between the cylinder block and the cylinder head of an air compressor, including a cylinder block 1, a cylinder head 2, a bolt 3 and an O-ring 4. The lower end of the cylinder head 2 is inserted into the groove of the cylinder block 1, and the cylinder head 2 and the cylinder block 1 are fastened by the bolt 3. A chamfer A with a triangular cross-section is provided at the orifice of the inner hole of the cylinder block 1. The chamfer A is c*45°, and an O-ring 4 is embedded on the chamfer A. The inner diameter of the O-ring 4 is smaller than the outer diameter of the lower insertion end of the cylinder head 2, and the outer diameter of the O-ring 4 extends to the outside of the orifice of the inner hole of the cylinder block 1; The O-ring 4 is installed in the clearance of the chamfer A, and the cross-section of the O-ring 4 is circular; The diameter of the O-ring 4 is a, and a is not less than 1.1*c and not greater than ; Since the chamfer A at the junction of the cylinder head 2 and the cylinder block 1 is c*45°, the length of the hypotenuse at the chamfer A is ; When the O-ring 4 is installed, the O-ring 4 will be squeezed to generate a certain deformation, (such as Figure 2As shown in the figure, the circular O-ring 4 will be squeezed into a triangle, and the three sides of the triangle will closely fit the three sides at the joints of the cylinder block 1 and the cylinder head 2 to achieve a sealing effect. If the diameter of the O-ring 4 is too large, the sealing effect will be affected due to the small space at the chamfer A. If the diameter of the O-ring 4 is too small, the O-ring 4 cannot fit with the three sides after being squeezed, and the sealing effect cannot be achieved. The diameter a of the O-ring 4 is c * 1.2. It has been proven by experiments that when the coefficient between the diameter of the O-ring 4 and the size c of the chamfer A is 1.2, that is, a = c * 1.2, the sealing performance of the O-ring 4 after being squeezed is the most optimal. In actual use, the calculated value of a can be customized, but in some special cases, the closest national standard parts can also be used for substitution. It should be noted that when tightening the bolt 3, a certain tightening force is required to achieve the best effect, so a torque wrench is needed for tightening.

[0019] The usage process of the present utility model is as follows: First, select the best O-ring 4 through calculation; then install the O-ring 4 at the corner of the cylinder head 2, and then insert the cylinder head 2 into the groove of the cylinder block 1. Among them, the chamfered inclined surface of the cylinder block 1 is in contact with the O-ring 4; then use the bolt 3 to connect the cylinder block 1 and the cylinder head 2 together, and finally use a torque wrench for tightening.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0021] The parts not detailed in the present utility model are prior art.

Claims

1. A sealing structure between a cylinder body and a cylinder head of an air compressor, comprising a cylinder body (1), a cylinder head (2), bolts (3) and an O-ring (4), wherein: The lower end of the cylinder cover (2) is inserted into the groove of the cylinder body (1), and the cylinder cover (2) and the cylinder body (1) are fastened by bolts (3). The inner hole opening of the cylinder body (1) is provided with a chamfer A with a triangular cross section, and an O-ring (4) is embedded on the chamfer A. The inner diameter of the O-ring (4) is smaller than the outer diameter of the insertion end of the lower end of the cylinder cover (2), and the outer diameter of the O-ring (4) extends to the outside of the hole opening of the inner hole of the cylinder body (1).

2. The sealing structure between the cylinder block and the cylinder head of an air compressor according to claim 1, characterized in that: The chamfer angle A is c*45°.

3. The sealing structure between the cylinder block and the cylinder head of an air compressor according to claim 2, characterized in that: The cross-sectional diameter of the O-ring (4) is a, which is not less than 1.1*c and not greater than .

4. The sealing structure between the cylinder block and the cylinder head of an air compressor according to claim 1, characterized in that: The O-ring (4) is sleeved at the corner of the lower end of the cylinder cover (2) and contacts the inclined surface of the chamfer A.

5. The sealing structure between the cylinder block and the cylinder head of an air compressor according to claim 3, characterized in that: The diameter a of the O-ring (4) is c*1.2.

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