A diaphragm compressor plunger and crosshead

Abstract

The present invention relates to a diaphragm compressor, specifically a diaphragm compressor plunger and a crosshead, including a cylindrical plunger, the lower end of the plunger expands outward to form a plunger head, and different from the prior art, a step hole is opened from the lower end of the plunger head, the lower section of the step hole is a large hole, and the upper section is a small hole, a connecting plate is inserted into the large hole, the connecting plate and the mounting convex ring are fixedly connected by multiple screws, a pressure plate is arranged outside the mounting convex ring, the pressure plate abuts against the connecting plate, and the pressure plate and the plunger head are fixedly connected by multiple screws. Compared with the prior art, the present invention breaks through the tradition so that the diameter of the plunger can be larger than the diameter of the mounting convex ring of the crosshead, meeting the design and installation requirements of a large-flow diaphragm head oil cylinder.

Description

Technical Field

[0001] The invention relates to a diaphragm compressor, in particular to a plunger and a crosshead of a diaphragm compressor. Background Art

[0002] like Figure 1 As shown, the inner end of the plunger 1 of the existing diaphragm compressor is an enlarged plunger head 11, and the pressure plate 2 is sleeved on the plunger 1 to press the plunger head 11 to fix the plunger 1 on the crosshead 3.

[0003] As diaphragm compressors develop towards high pressure or ultra-high pressure and large flow, the working diameter of the plunger is getting larger and larger. However, since the diameter of the plunger head 11 is larger than the diameter of the plunger 1, the diameter of the plunger head 11 cannot be larger than the diameter of the mounting convex ring 31 of the crosshead 3. On the basis of a certain diameter of the mounting convex ring 31 of the crosshead 3, the working diameter of the plunger cannot be larger than the diameter of the mounting convex ring 31 of the crosshead 3. If the outer diameter of the oil cylinder must be increased in order to increase the diameter of the plunger, and then the crankcase structure must be enlarged, the crankcase of the diaphragm compressor will become more bulky, thereby increasing the size and production cost of the skid-mounted unit. Summary of the invention

[0004] In order to overcome the defects or one of the defects of the prior art, the present invention discloses a diaphragm compressor plunger and a crosshead, and the technical solution adopted is:

[0005] A diaphragm compressor plunger and crosshead include a cylindrical plunger, the lower end of the plunger expands outward to form a plunger head. Different from the prior art, a step hole is opened from the lower end of the plunger head, the lower section of the step hole is a large hole, and the upper section is a small hole. A connecting plate is inserted into the large hole, and the connecting plate is fixedly connected to a mounting convex ring by multiple screws. A pressure plate is arranged outside the mounting convex ring, the pressure plate abuts against the connecting plate, and the pressure plate is fixedly connected to the plunger head by multiple screws.

[0006] Furthermore, the height of the large hole is not greater than the thickness of the plunger head, and the diameter of the large hole is equal to the diameter of the plunger and greater than the outer diameter of the mounting convex ring of the crosshead.

[0007] Furthermore, the outer diameter of the connecting disk is greater than the outer diameter of the mounting protruding ring of the crosshead.

[0008] Further, the outer diameter of the pressure plate is equal to the outer diameter of the plunger head.

[0009] Furthermore, the pressure plate abuts against a portion of the connection plate that is located outside the mounting protruding ring.

[0010] Compared with the prior art, the present invention breaks through the tradition and meets the design and installation requirements of a large-flow diaphragm head cylinder without changing the plunger size and the outer diameter of the cylinder and without increasing the structural size of the crankcase. It has a light weight, high rigidity and good force resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a plunger and a crosshead of an existing diaphragm compressor.

[0012] Figure 2 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 2 A diaphragm compressor plunger and crosshead shown in the figure include a cylindrical plunger 1, the lower end of the plunger 1 expands outward to form a plunger head 11, a step hole 12 is opened from the lower end of the plunger head 11, the lower section of the step hole 12 is a large hole, and the upper section is a small hole, the height of the large hole is not greater than the thickness of the plunger head 11, the diameter of the large hole is equal to the diameter of the plunger 1 and greater than the outer diameter of the mounting convex ring 31 of the crosshead 3, a connecting plate 4 is inserted into the large hole, the outer diameter of the connecting plate 4 is greater than the outer diameter of the mounting convex ring 31 of the crosshead 3, the connecting plate 4 and the mounting convex ring 31 are fixedly connected by multiple screws, a pressure plate 2 is arranged outside the mounting convex ring 31, the outer diameter of the pressure plate 2 is equal to the outer diameter of the plunger head 11, the pressure plate 2 abuts against the part of the connecting plate 4 located outside the mounting convex ring 31, and the pressure plate 2 and the plunger head 11 are fixedly connected by multiple screws.

[0017] Since the diameter of the large hole is equal to the diameter of the plunger 1, and the diameter of the large hole is larger than the outer diameter of the mounting convex ring 31 of the crosshead 3, the diameter of the plunger 1 is larger than the outer diameter of the mounting convex ring 31 of the crosshead 3, breaking through the limitations of traditional design. On the basis of a certain diameter of the mounting convex ring 31 of the crosshead 3, the working diameter of the plunger is greatly increased, meeting the design and installation requirements of the large flow diaphragm head oil cylinder. At the same time, since the step hole 12 is opened from the lower end of the plunger head 11, the weight of the plunger head 11 is reduced, the center of gravity is moved upward, and the radial centrifugal force at the crosshead 3 is reduced.

[0018] The parts not described in detail in the present invention are the prior art or common knowledge in the field.

Claims

1. A diaphragm compressor plunger and crosshead, comprising a cylindrical plunger (1), the lower end of the plunger (1) expanding outward to form a plunger head (11), characterized in that: A step hole (12) is formed at the lower end of the plunger head (11). The lower section of the step hole (12) is a large hole and the upper section is a small hole. A connecting plate (4) is inserted into the large hole. The connecting plate (4) is fixedly connected to the mounting convex ring (31) by a plurality of screws. A pressure plate (2) is disposed outside the mounting convex ring (31). The pressure plate (2) is in contact with the connecting plate (4). The pressure plate (2) is fixedly connected to the plunger head (11) by a plurality of screws.

2. A diaphragm compressor plunger and crosshead according to claim 1, characterized in that: The height of the large hole is not greater than the thickness of the plunger head (11), and the diameter of the large hole is equal to the diameter of the plunger (1) and greater than the outer diameter of the mounting convex ring (31) of the crosshead (3).

3. A diaphragm compressor plunger and crosshead according to claim 1, characterized in that: The outer diameter of the connecting plate (4) is greater than the outer diameter of the mounting convex ring (31) of the crosshead (3).

4. A diaphragm compressor plunger and crosshead according to claim 1, characterized in that: The outer diameter of the pressure plate (2) is equal to the outer diameter of the plunger head (11).

5. A diaphragm compressor plunger and crosshead according to claim 1, characterized in that: The pressure plate (2) abuts against a portion of the connection plate (4) located outside the mounting convex ring (31).

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