Lightweight compressor piston

Abstract

The light compressor piston comprises a piston head and a piston rod, the piston head is provided with an installation cavity, the end of the piston rod is placed in the installation cavity, grooves are symmetrically formed in the left side and the right side of the outer wall of the piston head, movable plates capable of moving in the radial direction are arranged in the grooves, and threaded holes A leading to the installation cavity are formed in the middles of the grooves. The end of the piston rod is provided with a threaded hole B. Connection between the piston head and the piston rod is fixed by screwing a fixing screw into the threaded hole A and the threaded hole B which are overlapped, the movable plate is provided with a through hole A for a screw rod part of the fixing screw to penetrate through, and elastic pressing blocks are symmetrically arranged on the upper side and the lower side of the inward face of the movable plate. The upper end and the lower end of the groove are provided with through holes B for the elastic pressing block to penetrate into the installation cavity, the inward end of the elastic pressing block abuts against the piston rod, and the upper end and the lower end outside the piston head are sleeved with piston lantern rings respectively. The utility model has the advantages that the connecting part between the piston head and the piston rod is small in loosening probability, good in air tightness and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor parts, in particular to a lightweight compressor piston. Background Art

[0002] A compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is a key device in the refrigeration system. It compresses the refrigerant gas by driving a piston that moves back and forth through a motor. There are two shortcomings in the traditional compressor piston. First, the connection between the piston head and the piston rod lacks a fixed structure, and the probability of the piston loosening is high when the piston moves. Second, there is only a single piston ring on the outside of the piston head. When the piston ring is worn too much, the piston cannot ensure sufficient airtightness, reducing the compression effect. Utility Model Content

[0003] The utility model aims to provide a lightweight compressor piston, which has the advantages of low probability of loosening of the connection between the piston head and the piston rod, good air tightness and convenient maintenance.

[0004] The technical solution of the utility model is as follows:

[0005] A lightweight compressor piston comprises a piston head and a piston rod, wherein the piston head is provided with a mounting cavity, the end of the piston rod is placed in the mounting cavity, the cross-sectional shape of the mounting cavity is an I-shaped, grooves are symmetrically provided on the left and right sides of the outer wall of the piston head, a movable plate which can move radially is provided in the groove, a threaded hole A leading to the mounting cavity is provided in the middle of the groove, the central axes of the threaded holes A on the left and right sides coincide, a threaded hole B corresponding to the threaded hole A is provided at the end of the piston rod, the connection between the piston head and the piston rod is fixed by screwing fixing screws into the overlapping threaded holes A and threaded holes B, a through hole A is provided on the movable plate for the screw part of the fixing screw to pass through, elastic pressure blocks are symmetrically provided on the upper and lower sides of the inner surface of the movable plate, through holes B are provided at the upper and lower ends of the groove for the elastic pressure blocks to penetrate into the mounting cavity, the inner end of the elastic pressure block abuts on the piston rod, and the upper and lower ends outside the piston head are respectively sleeved with piston rings, and the piston ring is detachably connected to the piston head.

[0006] Preferably, the natural length of the elastic pressing block is greater than the length of the through hole B, the inner portion of the through hole B is provided with a limiting groove, and a limiting block corresponding to the limiting groove is provided on the inner end of the elastic pressing block, and the limiting block is integrated with the elastic pressing block.

[0007] Preferably, the inner cavity of the piston ring is provided with an internal thread, and the outer wall of the piston head is provided with an external thread corresponding to the internal thread, and the threaded connection between the piston ring and the piston head is achieved by using the internal thread and the external thread in combination, and the length of the part of the piston head with the external thread is equivalent to the length of the piston ring.

[0008] Preferably, a blocking ring is provided along the circumference of the inner side of the portion with the external thread on the outer wall of the piston head, and the blocking ring abuts against the piston sleeve ring.

[0009] Preferably, the cross-sectional dimension of the through hole A is smaller than the cross-sectional dimension of the nut of the fixing screw, and the cross-sectional dimension of the through hole A is larger than the cross-sectional dimension of the screw rod of the fixing screw.

[0010] The utility model has the following beneficial technical effects:

[0011] 1. Fix the connection between the piston head and the piston rod by fixing screws and elastic pressure blocks to improve the connection strength and reduce the probability of the piston head loosening from the piston rod. During installation, first screw the fixing screw into the threaded hole A but not into the installation cavity, then put the piston rod into the installation cavity, let the threaded hole A and the threaded hole B overlap, and then screw the fixing screw into the threaded hole B to fix the connection between the piston head and the piston rod. In the process of screwing in the fixing screw, the nut part of the fixing screw squeezes the movable plate inward, so that the elastic pressure block connected to the movable plate extends from the through hole B into the installation cavity and presses on the piston rod. The friction between the elastic pressure block and the piston rod is used to further fix the connection between the piston head and the piston rod.

[0012] 2. There are two piston rings on the piston head. When one piston ring is worn too much and affects the sealing performance, the other piston ring can still function normally, with good air tightness and improved fault tolerance. The piston ring and the piston head are detachably connected, so the piston ring that can no longer be used can be replaced, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The technical solution of the utility model will be further described below in conjunction with the accompanying drawings.

[0014] Attached Figure 1 It is a top view of the utility model when the piston rod is removed.

[0015] Attached Figure 2 It is a left side view of the piston head of the utility model.

[0016] Attached Figure 3 It is a cross-sectional view from the main perspective of the utility model.

[0017] Attached Figure 4 It is a left view of the utility model.

[0018] In the figure: 1-piston head, 2-piston rod, 3-installation cavity, 4-groove, 5-movable plate, 6-threaded hole A, 7-threaded hole B, 8-fixing screw, 9-through hole A, 10-elastic pressure block, 11-through hole B, 12-piston collar, 13-limiting groove, 14-limiting block, 15-blocking ring. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example:

[0021] like Figures 1 to 4 As shown, this embodiment provides a lightweight compressor piston, including a piston head 1 and a piston rod 2. The piston head 1 is provided with a mounting cavity 3, and the end of the piston rod 2 is placed in the mounting cavity 3. The cross-sectional shape of the mounting cavity 3 is an I-shaped, and grooves 4 are symmetrically provided on the left and right sides of the outer wall of the piston head 1. A movable plate 5 that can move radially is provided in the groove 4. A threaded hole A6 leading to the mounting cavity 3 is provided in the middle of the groove 4. The central axes of the threaded holes A6 on the left and right sides coincide with each other. A threaded hole B7 corresponding to the threaded hole A6 is provided at the end of the piston rod 2. By moving the threaded hole B7 to the corresponding threaded hole A6, the piston rod 2 is provided with a threaded hole B7 corresponding to the threaded hole A6. The stacked threaded holes A6 and B7 are screwed into the fixing screws 8 to fix the connection between the piston head 1 and the piston rod 2. The movable plate 5 is provided with a through hole A9 for the screw portion of the fixing screw 8 to pass through. The upper and lower sides of the inner surface of the movable plate 5 are symmetrically provided with elastic pressure blocks 10. The upper and lower ends of the groove 4 are provided with through holes B11 for the elastic pressure blocks 10 to penetrate into the installation cavity 3. The inward ends of the elastic pressure blocks 10 abut against the piston rod 2. The upper and lower ends outside the piston head 1 are respectively covered with piston rings 12, and the piston ring 12 is detachably connected to the piston head 1.

[0022] The connection between the piston head 1 and the piston rod 2 is fixed by fixing screws 8 and elastic pressure blocks 10, so as to improve the connection strength and reduce the probability of the piston head 1 loosening from the piston rod 2. During installation, the fixing screw 8 is first screwed into the threaded hole A6 but not into the installation cavity 3, and then the piston rod 2 is placed into the installation cavity 3 so that the threaded hole A6 and the threaded hole B7 overlap, and then the fixing screw 8 is screwed into the threaded hole B7 to fix the connection between the piston head 1 and the piston rod 2. In the process of screwing in the fixing screw 8, the nut part of the fixing screw 8 squeezes the movable plate 5 inward, so that the elastic pressure block 10 connected to the movable plate 5 extends from the through hole B11 into the installation cavity 3 and presses the piston rod 2, and the friction between the elastic pressure block 10 and the piston rod 2 is used to further fix the connection between the piston head 1 and the piston rod 2. Two piston rings 12 are sleeved on the piston head 1. When one piston ring 12 is worn out and affects the sealing performance, the other piston ring 12 can still function normally, with good air tightness and improved fault tolerance. The piston ring 12 is detachably connected to the piston head 1, so the piston ring 12 that cannot be used any longer can be replaced, which is convenient for maintenance.

[0023] Furthermore, the natural length of the elastic pressing block 10 is greater than the length of the through hole B11, and a limiting groove 13 is provided at the inner side of the through hole B11. A limiting block 14 corresponding to the limiting groove 13 is provided on the inner end of the elastic pressing block 10, and the limiting block 14 is integrated with the elastic pressing block 10. The limiting block 14 and the limiting groove 13 are used together to prevent the elastic pressing block 10 from moving outward and escaping from the through hole B11.

[0024] Furthermore, the inner cavity of the piston ring 12 is provided with an internal thread, and the outer wall of the piston head 1 is provided with an external thread corresponding to the internal thread. The threaded connection between the piston ring 12 and the piston head 1 is achieved by using the internal thread and the external thread in combination. The length of the part of the piston head 1 with the external thread is equivalent to the length of the piston ring 12.

[0025] Further, the outer wall of the piston head 1 is provided with a blocking ring 15 along the circumference on the inner side of the part with the external thread, and the blocking ring 15 abuts against the piston collar 12. The blocking ring 15 assists in positioning so that the piston collar 12 can be installed in the correct position.

[0026] Furthermore, the cross-sectional dimensions of the through hole A9 are smaller than the cross-sectional dimensions of the nut of the fixing screw 8, and the cross-sectional dimensions of the through hole A9 are larger than the cross-sectional dimensions of the screw rod of the fixing screw 8. Under the premise that the screw rod of the fixing screw 8 can pass through the through hole A9, the nut of the fixing screw 8 cannot pass through, so that when the fixing screw 8 is screwed in, it can squeeze the movable plate 5 to move inward, thereby driving the elastic pressing block 10 to press the piston rod 2.

[0027] The working principle and use process of this utility model:

[0028] During installation, first screw the fixing screw 8 into the threaded hole A6, then screw the piston collar 12 onto the upper and lower ends of the piston head 1, then put the end of the piston rod 2 into the installation cavity 3 of the piston head 1 and overlap the threaded hole A6 and the threaded hole B7, and finally screw the two fixing screws 8 into the threaded hole B7. When replacing the piston collar 12, unscrew the fixing screw 8, remove the piston head 1, remove the damaged piston collar 12 from the piston head 1 and replace it with a new one, and finally install the piston head 1 back on the piston rod 2.

[0029] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A lightweight compressor piston, characterized in that: The utility model comprises a piston head and a piston rod, wherein the piston head is provided with an installation cavity, the end of the piston rod is placed in the installation cavity, the cross-sectional shape of the installation cavity is an I-shape, grooves are symmetrically provided on the left and right sides of the outer wall of the piston head, a movable plate which can move radially is provided in the groove, a threaded hole A leading to the installation cavity is provided in the middle of the groove, the central axes of the threaded holes A on the left and right sides coincide, a threaded hole B corresponding to the threaded hole A is provided at the end of the piston rod, the connection between the piston head and the piston rod is fixed by screwing fixing screws into the overlapping threaded holes A and threaded holes B, a through hole A is provided on the movable plate for the screw part of the fixing screw to pass through, elastic pressure blocks are symmetrically provided on the upper and lower sides of the inner surface of the movable plate, the upper and lower ends of the groove are provided with through holes B for the elastic pressure blocks to penetrate into the installation cavity, the inner end of the elastic pressure block abuts on the piston rod, the upper and lower ends outside the piston head are respectively covered with piston rings, and the piston ring is detachably connected to the piston head.

2. A lightweight compressor piston according to claim 1, characterized in that: The natural length of the elastic pressing block is greater than the length of the through hole B. The inner portion of the through hole B is provided with a limiting groove. The inner end of the elastic pressing block is provided with a limiting block corresponding to the limiting groove. The limiting block and the elastic pressing block are integrated.

3. A lightweight compressor piston according to claim 1, characterized in that: The inner cavity of the piston ring is provided with an internal thread, and the outer wall of the piston head is provided with an external thread corresponding to the internal thread. The threaded connection between the piston ring and the piston head is achieved by using the internal thread and the external thread in combination. The length of the part of the piston head with the external thread is equivalent to the length of the piston ring.

4. A lightweight compressor piston according to claim 3, characterized in that: A blocking ring is circumferentially arranged on the inner side of the portion with the external thread on the outer wall of the piston head, and the blocking ring abuts against the piston sleeve ring.

5. The lightweight compressor piston according to claim 1, characterized in that: The cross-sectional dimension of the through hole A is smaller than the cross-sectional dimension of the nut of the fixing screw, and the cross-sectional dimension of the through hole A is larger than the cross-sectional dimension of the screw rod of the fixing screw.

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