Improved piston and piston rod assembly applied to double-cylinder double-piston compressor

Abstract

The utility model provides an improved piston and piston rod assembly applied to a double-cylinder double-piston compressor. The improved piston and piston rod assembly comprises a piston I, a piston II, a piston rod and a lining. Compared with a traditional piston and piston rod assembly, a spacer bush is omitted, the length of the piston rod is shortened, and the length of the shortened piston rod is 80% of that of an original piston rod; the length of the piston II is increased, and the increased length is the length of the omitted spacer bush; the piston I and the lining sleeve the piston rod, and the tail of the piston II is screwed on the head of the piston rod through threads. The piston I and the lining are positioned and fixed through a shaft shoulder of the piston rod and the tail end face of the piston II. The length of the improved piston rod is shortened by 20% compared with that of an original piston rod, machining and manufacturing of the piston rod are better facilitated, and the straightness of the piston rod is effectively improved; and a spacer bush between the piston I and the piston II is omitted, so that the double-cylinder double-piston gas compressor is simpler and more convenient to assemble, the manufacturing cost is reduced, and the double-cylinder double-piston gas compressor has higher market competitiveness.

Description

Technical Field

[0001] The utility model relates to a piston and a piston rod assembly, in particular to an improved piston and a piston rod assembly installed in a double-cylinder double-piston compressor. Background Art

[0002] Figure 1 The invention is a double-cylinder double-piston gas compressor, which comprises a cylinder body Ⅰ (reference number 1), a cylinder body Ⅱ (reference number 2), a cylinder sleeve 3, a cylinder head 4, a piston Ⅰ (reference number 5), a piston Ⅱ (reference number 6), and a piston rod 7. The cylinder body Ⅰ is an open cylinder body, which is equipped with a cylinder sleeve 3; the cylinder body Ⅱ is a cylinder body with two open ends, the tail of which is inserted into the cylinder body Ⅰ, and the side wall thereof is against the end of the cylinder body Ⅰ, and the two are connected by bolts (not shown in the figure), and the head of the cylinder body Ⅱ is fixedly connected to the cylinder head 4 by bolts. The piston Ⅰ (reference number 5) is located in the cylinder body Ⅰ, and the piston Ⅱ (reference number 6) is located in the cylinder body Ⅱ. The piston rod 7 passes through the bottom of the cylinder body Ⅰ and extends into the cylinder body Ⅰ and the cylinder body Ⅱ. The inner hole of the piston Ⅰ is equipped with a bushing 8 and then is sleeved on the piston rod 7. The piston Ⅱ is fixed to the head of the piston rod 7 by threads.

[0003] Piston Ⅰ (see figure 5), piston Ⅱ (see figure 6), piston rod 7, bushing 8 and spacer 9 constitute a piston and piston rod assembly, which divides the space in the cylinder into areas Ⅰ, Ⅱ and Ⅲ. Among them, areas Ⅰ and Ⅲ are gas compression spaces. When the piston and piston rod assembly moves to the left, the gas in area Ⅰ is compressed and area Ⅲ is filled with gas; when the piston and piston rod assembly moves to the right, the gas in area Ⅲ is compressed and area Ⅰ is filled with gas. A double-cylinder double-piston gas compressor is to fix two pistons on the same piston rod, and drive the reciprocating movement of piston Ⅰ and piston Ⅱ through the reciprocating motion of the piston rod, change the gas volume of areas Ⅰ and Ⅲ, and achieve the purpose of one piston rod driving two pistons to compress the gas twice in one round trip.

[0004] The piston and piston rod assembly is the main component of a double-cylinder double-piston gas compressor. Since the compressor has two pistons built in, a certain distance needs to be maintained between the two pistons to ensure their respective strokes. Figure 1 As shown, a spacer sleeve 9 is arranged between piston I and piston II. The spacer sleeve 9 is sleeved on the piston rod 7, with one end abutting against the end of piston I and the other end abutting against the end face of piston II.

[0005] Figure 1 The disadvantage of the double-cylinder double-piston gas compressor shown is that the piston rod is too long and difficult to process. Since the double-cylinder double-piston gas compressor has high requirements for the straightness of the piston rod, the longer the piston rod, the more difficult it is to process and the higher the manufacturing cost. Summary of the invention

[0006] In view of the above reasons, the purpose of the utility model is to provide an improved piston and piston rod assembly, in which the length of the piston rod is effectively shortened, the processing difficulty is greatly reduced, and the manufacturing cost is low.

[0007] To achieve the above purpose, the utility model adopts the following technical solution: an improved piston and piston rod assembly applied to a double-cylinder double-piston compressor, which includes piston I, piston II, piston rod and bushing,

[0008] The length of the piston rod is shortened, and the shortened length of the piston rod is 80% of the original length of the piston rod;

[0009] The length of the piston II is increased, and the increased length is the length of the omitted spacer;

[0010] The piston I and the bushing are sleeved on the piston rod, and the tail of the piston II is screwed onto the head of the piston rod through threads.

[0011] Preferably, the piston I and the bushing are positioned and fixed by the shoulder of the piston rod and the tail end face of the piston II. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the internal structure of an existing double-cylinder double-piston gas compressor;

[0013] Figure 2 This is a schematic diagram of the structure of the improved piston and piston rod assembly of the utility model;

[0014] Among them: 1. Cylinder body I, 2. Cylinder body II, 3. Cylinder liner, 4. Cylinder head, 5. Piston I, 6. Piston II, 7. Piston rod, 8. Bushing, 9. Spacer. DETAILED DESCRIPTION

[0015] The structure and features of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that various modifications can be made to the embodiments disclosed herein, and therefore, the embodiments disclosed in the specification should not be regarded as limiting the present invention, but are merely examples of embodiments, the purpose of which is to make the features of the present invention obvious.

[0016] like Figure 2 As shown, the improved piston and piston rod assembly of the utility model includes piston Ⅰ (reference numeral 5), piston Ⅱ (reference numeral 6), piston rod 7 and bushing 8.

[0017] The length of the piston rod 7 is shortened, and the length L2 of the shortened piston rod 7 is Figure 1 80% of the original piston rod length L1 shown.

[0018] The spacer sleeve 9 is omitted, and the length of the piston II is increased by the length of the omitted spacer sleeve 9.

[0019] The tail of piston II is still threadedly connected to the head of piston rod 7.

[0020] When installing the modified piston and piston rod assembly, piston I and bushing 8 are sleeved on piston rod 7, the tail of piston II is screwed on piston rod 7 through threads, and piston I and bushing 8 are positioned and fixed through the shaft shoulder of piston rod 7 and the tail end face of piston II.

[0021] The length L2 of the piston rod after the modification of the utility model is shortened by 20% compared with the original length L1 of the piston rod, which is more conducive to the processing and manufacturing of the piston rod and effectively improves the straightness of the piston rod.

[0022] The spacer between piston I and piston II is omitted, making the assembly of the double-cylinder double-piston gas compressor simpler and more convenient, reducing the manufacturing cost and making it more competitive in the market.

[0023] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An improved piston and piston rod assembly for a dual-cylinder dual-piston compressor, characterized in that: It includes piston I, piston II, piston rod and bushing. The length of the piston rod is shortened, and the shortened length of the piston rod is 80% of the original length of the piston rod; The length of the piston II is increased, and the increased length is the length of the omitted spacer; The piston I and the bushing are sleeved on the piston rod, and the tail of the piston II is screwed onto the head of the piston rod through threads.

2. The improved piston and piston rod assembly for a dual-cylinder dual-piston compressor according to claim 1 is characterized in that: The piston I and the bushing are positioned and fixed by the shaft shoulder of the piston rod and the tail end face of the piston II.

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