Diaphragm fixing device of diaphragm compressor

Abstract

The utility model discloses a diaphragm fixing device of a diaphragm compressor, which relates to the technical field of diaphragm fixation and comprises a pressure pipe, a positioning pin and a spring, the spring, the positioning pin and the pressure pipe are respectively arranged in mounting holes of a cylinder head of the compressor from bottom to top, the upper end of the positioning pin is inserted into the pressure pipe, and the lower end of the positioning pin is inserted into the pressure pipe. And the upper end of the spring is sleeved at the bottom of the positioning pin. During use, the whole structure is simple, compared with an existing structure, only three parts are simplified to be used in a matched mode, operation is convenient, time and cost are saved, the membrane needs to be replaced, only the cylinder cover needs to be lifted, the spring is not pressed any more, and the positioning pin of the fixing device pops out of the surface of the cylinder head. And the installation can be completed by matching a positioning hole pre-formed in a fixed position of the diaphragm with a fixing device.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm fixing, and particularly relates to a diaphragm fixing device for a diaphragm compressor. Background Art

[0002] A diaphragm compressor is a special positive displacement compressor. Through the reciprocating motion of the piston in the middle body, the hydraulic oil is pushed to flow, and uniformly acts on the diaphragm through many small holes and annular grooves on the cylinder block, causing the diaphragm to vibrate back and forth, thereby completing the reciprocating compression process of expansion, suction, compression, and exhaust. The diaphragm is one of the key components of the diaphragm compressor. It completely fits with the O-ring seals in the cylinder block and cylinder head grooves to form a sealed space, ensuring that the compressed gas on the gas side and the hydraulic oil on the oil side do not leak. Only in this way can the compressor work normally and stably. This requires that during the installation process of the diaphragm, the center of the diaphragm is coaxial with the center of the cylinder block as much as possible and the error is within the allowable range, so that the O-ring seal fits evenly with the outer circle of the diaphragm, and then is pressed tightly by the cylinder block to form a reliable seal.

[0003] During the installation process of the diaphragm, if the diaphragm is not positioned, the center of the diaphragm and the center of the cylinder block may shift. If the shift is too large, it will cause the O-ring seal to be misaligned with the diaphragm, resulting in incomplete sealing and leakage of compressed gas or hydraulic oil; relying on manual visual positioning is random, which greatly increases the workload of workers, affects the installation efficiency of products, and reduces the production progress. Moreover, for a horizontal cylinder head, the diaphragm needs to be installed horizontally. Without a diaphragm fixing device, the diaphragm will fall due to the action of gravity, which requires fixing through a positioning device during the installation process. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a diaphragm fixing device for a diaphragm compressor to overcome the above defects in the prior art.

[0005] A diaphragm fixing device for a diaphragm compressor includes a pressure tube, a positioning pin, and a spring. The spring, the positioning pin, and the pressure tube are respectively arranged in the installation hole of the compressor cylinder head from bottom to top. The upper end of the positioning pin is inserted into the pressure tube, and the upper end of the spring is sleeved on the bottom of the positioning pin.

[0006] Preferably, the positioning pin includes an upper pin body, a middle pin body, and a lower pin body, and the middle pin body is arranged between the upper pin body and the lower pin body.

[0007] Preferably, the diameter of the middle pin body is larger than that of the upper pin body and the lower pin body.

[0008] Preferably, the pressure tube is provided with stepped holes that cooperate with the upper pin body and the middle pin body.

[0009] Preferably, the upper pin body and the middle pin body are in interference fit with the stepped holes.

[0010] The utility model has the following advantages:

[0011] 1. When the utility model is in use, the overall structure is simple. Compared with the existing structure, it is only simplified to three parts for cooperative use, with convenient operation, saving time and cost. When the diaphragm needs to be replaced, only lift the cylinder head, the spring is no longer under pressure, and the positioning pin of the fixing device pops out of the cylinder head surface. The diaphragm can be installed by matching the positioning holes pre - opened at the fixed position with the fixing device.

[0012] 2. When using this fixing device, during the installation process of the cylinder block diaphragm, the diaphragm can be fixed on the upper surface of the cylinder block, and it is ensured that the center of the diaphragm is concentric with the center of the cylinder block, so as to ensure that the O - ring is completely attached to the surface of the diaphragm, avoid sealing misalignment, and ensure the sealing performance after the cylinder head is combined with the cylinder.

[0013] 3. Compared with manual positioning by workers with the naked eye, random errors can be avoided, the accuracy of the installation process is ensured, the labor intensity of workers is low, the installation speed is fast, and the economic benefits are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the whole utility model.

[0015] Figure 2 It is a schematic structural diagram of the pressure pipe of the utility model.

[0016] Figure 3 It is a schematic structural diagram of the positioning pin of the utility model.

[0017] Figure 4 、 Figure 5 and Figure 6 They are all schematic structural diagrams of different angles of the fixing device of the utility model for fixing the diaphragm on the cylinder head.

[0018] Among them: 1. Pressure pipe; 11. Step hole; 2. Positioning pin; 21. Upper pin body; 22. Middle pin body; 23. Lower pin body; 3. Spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following is a further detailed description of the specific embodiments of the utility model by describing the embodiments with reference to the drawings, so as to help those skilled in the art have a more complete, accurate and in - depth understanding of the concept and technical solution of the utility model.

[0020] Such as Figures 1 - 3As shown in the figure, the utility model provides a diaphragm fixing device for a diaphragm compressor, which is characterized in that: it includes a pressure tube 1, a positioning pin 2 and a spring 3. The spring 3, the positioning pin 2 and the pressure tube 1 are respectively arranged in the installation holes of the compressor cylinder head from bottom to top. The upper end of the positioning pin 2 is inserted into the pressure tube 1. The upper end of the spring 3 is sleeved on the bottom of the positioning pin 2. The positioning pin 2 includes an upper pin body 21, a middle pin body 22 and a lower pin body 23. A middle pin body 22 is arranged between the upper pin body 21 and the lower pin body 23. The diameter of the middle pin body 22 is larger than that of the upper pin body 21 and the lower pin body 23.

[0021] In addition, a stepped hole 11 matching with the upper pin body 21 and the middle pin body 22 is arranged in the pressure tube 1. The upper pin body 21, the middle pin body 22 and the stepped hole 11 are in interference fit.

[0022] As Figure 4 shown in the figure, two holes are opened at the symmetric fixing positions of the cylinder head. The hole diameter is the same as the outer diameter of the cross-section of the pressure tube 1. The depth of the hole is such that after the fixing device (with the spring 3 facing inwards) on the cylinder head surface is installed into the hole, the upper surface of the pressure tube 1 is flush. Similarly, two holes are opened at the same fixing positions of the diaphragm. The fixing device composed of the positioning pin 2, the pressure tube 1 and the spring 3 is installed into the installation hole of the cylinder head with the spring 3 facing inwards. The positioning holes on the diaphragm are correspondingly and cooperatively installed with the fixing device installed in the cylinder head hole one by one, and the diaphragm is completed with positioning and fixing. Then the cylinder cover is closed, and the spring 3 on the diaphragm fixing device is compressed and shrunk into the hole, and the diaphragm is tightly attached to the O-ring seals on the cylinder head and the cylinder cover.

[0023] As Figure 5 shown in the figure, when the cylinder cover is closed, the spring 3 on the fixing device is compressed and shrunk. The part of the upper pin body 21 of the positioning pin 2 of the fixing device that extends out of the cylinder head surface is shrunk into the installation hole. There is no need to make structural changes to the cylinder cover, and it does not affect the normal closing of the cylinder cover and the cylinder block.

[0024] As Figure 6 shown in the figure, for a horizontal cylinder block, the cross-section of its cylinder head is perpendicular to the ground. During the installation process of the diaphragm 16, the positioning pin 2 of the fixing device that extends out of the cylinder head surface hooks the diaphragm through the positioning hole on the diaphragm, and there is no need to rely on other external force devices to fix the diaphragm.

[0025] The above has made an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the concept and technical solutions of the utility model, or the concept and technical solutions of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A diaphragm fixing device for a diaphragm compressor, characterized in that: The invention comprises a pressure tube (1), a positioning pin (2) and a spring (3); the spring (3), the positioning pin (2) and the pressure tube (1) are respectively arranged in the mounting hole of the compressor cylinder head from bottom to top; the upper end of the positioning pin (2) is inserted into the pressure tube (1), and the upper end of the spring (3) is sleeved on the bottom of the positioning pin (2).

2. A diaphragm fixing device for a diaphragm compressor according to claim 1, characterized in that: The positioning pin (2) comprises an upper pin body (21), an intermediate pin body (22) and a lower pin body (23), wherein the intermediate pin body (22) is arranged between the upper pin body (21) and the lower pin body (23).

3. A diaphragm fixing device for a diaphragm compressor according to claim 2, characterized in that: The diameter of the middle pin body (22) is larger than that of the upper pin body (21) and the lower pin body (23).

4. A diaphragm fixing device for a diaphragm compressor according to claim 2, characterized in that: The pressure tube (1) is provided with a stepped hole (11) which matches the upper pin body (21) and the middle pin body (22).

5. A diaphragm fixing device for a diaphragm compressor according to claim 4, characterized in that: The upper pin body (21), the middle pin body (22) and the stepped hole (11) are interference fit.

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