A spool and spool retainer assembly machining tool and method

Abstract

The present application relates to the technical field of oil-injected screw compressor, in particular to a slide valve and slide valve stop block combined machining tool, which can make the slide valve and slide valve stop block yin and yang rotor hole circular arc surface hole diameter size consistency high, improve the processing efficiency, it includes boring mould body, the boring mould body is opened and is arranged in upper and lower yin rotor hole and yang rotor hole, two clamping positioning holes arranged on the left and right, the clamping positioning hole and yang rotor hole, yin rotor hole all have coincident area, set the center of yang rotor hole as a and the diameter is consistent with yang rotor outer circle diameter D3, the center of yin rotor hole is b and the diameter is consistent with yin rotor outer circle diameter D2, the center of two clamping positioning holes is c and d respectively, the diameter is D4 and D4 is greater than the reference outer circle diameter D1 of slide valve and slide valve stop block, the line ab of center a and center b is perpendicular, two clamping positioning holes are distributed with the line ab as the axis of symmetry, and the side wall of the clamping positioning hole is provided with a positioning fixing screw, and the present application also provides a machining method using the tool.

Description

Technical Field

[0001] This invention relates to the field of oil-injected screw compressor technology, specifically to a tooling and processing method for assembling a slide valve and a slide valve stop block. Background Technology

[0002] The slide valve and slide valve stop block are important components of the main unit of medium and high pressure oil-injected screw compressor. By moving the slide valve and slide valve stop block, the effective working length of the rotor can be changed, thereby achieving the purpose of gas volume regulation.

[0003] In general, screw compressors only have a slide valve. During machining, the male and female rotor bore diameters of the slide valve are the same as those of the male and female rotor bore diameters on the compressor housing, and there are threads on the slide valve end face. After the slide valve is installed into the compressor housing, the threads are tightened and the male and female rotor bores are machined together with the compressor housing. However, in medium- and high-pressure oil-injected screw compressors, the slide valve is divided into two parts: the slide valve itself and the slide valve stop block. See... Figure 1-4 Furthermore, the diameter of the male and female rotor holes is larger than that of the machine housing, so they cannot be machined together with the machine housing.

[0004] from Figure 1-4 As can be seen, the reference outer diameters of the slide valve and the slide valve stop block are the same, both being D1. The outer diameters of the female rotor and male rotor are D2 and D3, respectively. The female rotor outer arc surface M and the male rotor outer arc surface N are formed on the slide valve and the slide valve stop block. During machining, the consistency requirements of the female rotor outer arc surface M and the male rotor outer arc surface N of the slide valve and the slide valve stop block are very high, that is, L1=L2+L4, with a dimensional tolerance of 0.02, making the machining very difficult. Summary of the Invention

[0005] To address the challenge of achieving consistent machining accuracy for existing spool valves and spool valve stop blocks, this invention provides a combined machining fixture for spool valves and spool valve stop blocks. This fixture ensures high consistency in the diameter of the arc-shaped holes in the male and female rotor holes of the spool valve and spool valve stop blocks, thereby improving machining efficiency. Furthermore, this invention also provides a machining method using this fixture.

[0006] The technical solution is as follows: A machining fixture for a combination of a slide valve and a slide valve stop block, characterized in that it includes a boring die body, on which are arranged vertically a male rotor hole and a female rotor hole, and two clamping and positioning holes arranged horizontally. The clamping and positioning holes overlap with both the male and female rotor holes. Let the center of the male rotor hole be a and its diameter be D3 (coinciding with the outer diameter of the male rotor). Let the center of the female rotor hole be b and its diameter be D2 (coinciding with the outer diameter of the female rotor). The centers of the two clamping and positioning holes are c and d, respectively, and their diameters are... The reference outer diameter D1 of the slide valve and the slide valve stop block is D4, and the line ab connecting the center a and the center b is a vertical line. The two clamping and positioning holes are symmetrically distributed about the line ab. The side walls of the clamping and positioning holes are provided with positioning and fixing screws. Two measuring blocks are respectively provided at the male rotor hole and the female rotor hole. The two measuring blocks at the male rotor hole are respectively set on the extension lines ac and ad, and the two measuring blocks at the female rotor hole are respectively set on the extension lines bc and bd.

[0007] A further feature is that the boring die body is provided with a datum hole for alignment.

[0008] A machining method using this tooling, characterized by comprising the following steps:

[0009] (1) Install the boring die onto the equipment workbench;

[0010] (2) Insert the slide valve and the slide valve stop block into the two clamping and positioning holes respectively, and fix them on the side with positioning and fixing screws;

[0011] (3) Align the alignment reference holes on the boring die body and establish the workpiece coordinate system;

[0012] (4) According to the precision requirements, the male rotor hole, the female rotor hole, and the outer arc surface of the female rotor and the outer arc surface of the male rotor on the slide valve and the slide valve stop block are precision bored so that the male rotor hole, the female rotor hole, and the outer arc surface of the female rotor and the outer arc surface of the male rotor on the slide valve and the slide valve stop block are processed and formed simultaneously.

[0013] Its further feature is that, in step (2), two measuring blocks are fixed next to the male rotor hole and the female rotor hole respectively, and the front end of the measuring block extends into the male rotor hole and the female rotor hole. In step (4), during fine boring, the front end of the measuring block is bored into an arc shape. The diameter of the male rotor hole can be measured according to the measuring blocks at the two male rotor holes, and the diameter of the female rotor hole can be measured according to the measuring blocks at the two female rotor holes.

[0014] With the present invention, the slide valve and the slide valve stop block can be fixed on a boring die body at the same time. After positioning and fixing, during precision boring, the outer arc surface of the female rotor and the outer arc surface of the male rotor on the slide valve and the slide valve stop block can be processed synchronously with the male rotor hole and the female rotor hole, which greatly improves the consistency of hole diameter size. There is no need for multiple clamping and fixing and processing, which effectively improves processing efficiency. Attached Figure Description

[0015] Figure 1 Schematic diagram of the slide valve stop block;

[0016] Figure 2 for Figure 1 AA section view;

[0017] Figure 3 This is a schematic diagram of a slide valve;

[0018] Figure 4 for Figure 3 BB section view;

[0019] Figure 5 This is a schematic diagram of the machining tooling structure of the present invention;

[0020] Figure 6 Schematic diagram of the tooling for machining the arc surfaces of the male and female rotor holes of a slide valve separately;

[0021] Figure 7 Schematic diagram of the tooling for machining the arc surfaces of the male and female rotor holes of the slide valve stop block separately;

[0022] Figure 8 A schematic diagram of the tooling used for machining the arc surfaces of the male and female rotor holes of the slide valve and the slide valve stop block. Detailed Implementation

[0023] See Figure 5As shown, a machining fixture for a combination of a slide valve and a slide valve stop block includes a boring die 1, positioning and fixing screws 8, and measuring blocks 10. The boring die 1 has male rotor holes 2 and female rotor holes 3 arranged vertically, and two clamping and positioning holes 4 and 5 arranged horizontally. The clamping and positioning holes 4 and 5 overlap with the male rotor holes 2 and female rotor holes 3. Let the center of the male rotor hole 2 be a and its diameter be D3, which is the same as the outer diameter of the male rotor. Let the center of the female rotor hole 3 be b and its diameter be D2, which is the same as the outer diameter of the female rotor. The centers of the two clamping and positioning holes 4 and 5 are... c and d are respectively, with a diameter D4, which is larger than the reference outer diameter D1 of the slide valve 6 and the slide valve stop block 7. This allows the slide valve 6 and the slide valve stop block 7 to be sequentially installed into the clamping and positioning holes 4 and 5. The line ab connecting the centers a and b is perpendicular. The two clamping and positioning holes are symmetrically distributed about the line ab, so the connecting lines cd and ab are perpendicular. Furthermore, the male rotor hole 2 and the female rotor hole 3 are bisected by the connecting line ab. Positioning screws 8 are provided on the side walls of the clamping and positioning holes 4 and 5 to fix the slide valve 6 and the slide valve stop block 7. The boring die body 1 is provided with a datum hole 9 for precise alignment during workpiece machining. Four measuring blocks 10 are provided, two at the male rotor hole 2 and two at the female rotor hole 3. Figure 5 As shown, the two measuring blocks 10 at the male rotor hole 2 are respectively set on the extension lines of ac and ad, and the two measuring blocks 10 at the female rotor hole 3 are respectively set on the extension lines of bc and bd, ensuring that the distance between the measuring block 10 and the corresponding arc surface does not deviate from the diameter of the female and male rotor holes during measurement, and that there is more space for operation and measurement.

[0024] The slide valve 6 and the slide valve stop block 7 can be machined separately or simultaneously.

[0025] Figure 6 The diagram shows the state of machining the arc surfaces of the male and female rotor holes of the slide valve separately. Figure 7 A state diagram of the arc surface of the male and female rotor holes of the slide valve stop block is given.

[0026] The following details the machining scheme for the combined arc surfaces of the male and female rotor holes of the slide valve and slide valve stop block, namely... Figure 8 As shown.

[0027] The machining method using this fixture includes the following steps:

[0028] (1) Install the boring die 1 onto the equipment workbench;

[0029] (2) Insert the slide valve 6 and the slide valve stop block 7 into the two clamping and positioning holes 4 and 5 respectively, and fix them on the side with positioning and fixing screws 8; fix two measuring blocks 10 next to the male rotor hole 2 and the female rotor hole 3 respectively, and let the front end of the measuring block 10 extend into the male rotor hole 2 and the female rotor hole 3.

[0030] (3) Align the alignment reference hole 9 on the boring die 1 and establish the workpiece coordinate system;

[0031] (4) According to the accuracy requirements, the outer arc surfaces of the male rotor hole 2, female rotor hole 3, and slide valve 6 and slide valve stop block 7 are precision bored so that the outer arc surfaces of the male rotor hole, female rotor hole, slide valve and slide valve stop block are simultaneously machined and formed. At the same time, the front end of the measuring block 10 is also bored into an arc shape. Since the male rotor hole 2 and female rotor hole 3 are not complete circles, it is not convenient to measure using measuring tools that abut at both ends. Therefore, after machining two corresponding measuring blocks 10, the measuring blocks 10 are installed along the diameter direction and can be measured with measuring tools.

[0032] Using the tooling of this invention, the diameter of the slide valve, the slide valve stop block and the arc-shaped holes of the male and female rotor holes are highly consistent. At the same time, the processing of the slide valve and the slide valve stop block is more flexible. They can be processed individually or in combination, and the combined processing is more efficient.

Claims

1. A tooling for machining a combination of a slide valve and a slide valve stop block, characterized in that, It includes a boring die body, on which are arranged vertically a male rotor hole and a female rotor hole, and two clamping and positioning holes arranged horizontally. The clamping and positioning holes overlap with both the male and female rotor holes. Let the center of the male rotor hole be a, and its diameter be D3, which is the same as the outer diameter of the male rotor. Let the center of the female rotor hole be b, and its diameter be D2, which is the same as the outer diameter of the female rotor. The centers of the two clamping and positioning holes are c and d, respectively, and their diameters are D4, where D4 is greater than the reference outer diameter D of the slide valve and the slide valve stop block.

1. The line ab connecting the center a and the center b is a perpendicular line. The two clamping and positioning holes are symmetrically distributed about the line ab. Positioning and fixing screws are provided on the side walls of the clamping and positioning holes. Two measuring blocks are respectively provided at the male rotor hole and the female rotor hole. The two measuring blocks at the male rotor hole are respectively located on the extension lines of the connecting lines ac and ad, and the two measuring blocks at the female rotor hole are respectively located on the extension lines of the connecting lines bc and bd. Alignment reference holes are provided on the boring die body.

2. A machining method using the tooling assembly of the slide valve and slide valve stop block as described in claim 1, characterized in that, It includes the following steps: (1) Install the boring die onto the equipment workbench; (2) Insert the slide valve and the slide valve stop block into the two clamping and positioning holes respectively, and fix them on the side with positioning and fixing screws; (3) Align the alignment reference holes on the boring die body and establish the workpiece coordinate system; (4) According to the precision requirements, the male rotor hole, the female rotor hole, and the outer arc surface of the female rotor and the outer arc surface of the male rotor on the slide valve and the slide valve stop block are precision bored so that the male rotor hole, the female rotor hole, and the outer arc surface of the female rotor and the outer arc surface of the male rotor on the slide valve and the slide valve stop block are processed and formed simultaneously.

3. The processing method according to claim 2, characterized in that, In step (2), two measuring blocks are fixed next to the male rotor hole and the female rotor hole respectively, and the front end of the measuring block extends into the male rotor hole and the female rotor hole. In step (4), during fine boring, the front end of the measuring block is bored into an arc shape. The diameter of the male rotor hole can be measured according to the measuring blocks at the two male rotor holes, and the diameter of the female rotor hole can be measured according to the measuring blocks at the two female rotor holes.

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