JPS647259Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a starting load reduction device for a screw compressor, which consists of a screw rotor having a spiral groove and a flat gate rotor that closely meshes with the screw rotor. be.

[Conventional technology]

As shown in FIGS. 2 and 3, the screw compressor consists of a screw rotor 1 that forms a spiral groove, and a flat plate-like rotor 1 that is disposed perpendicular to the axis of the screw rotor 1 and that forms teeth that mesh with the spiral groove. gate rotor 2
The main elements are: Specifically, a ring-shaped member 4 is installed inside the case body 3, and the screw rotor 1 is rotatably housed within the ring-shaped member 4, is pivotally supported by the case body 3, and is driven by a drive means (not shown). be rotated. The gate rotor 2 is pivotally supported by the case body 3, forms a flat surface 2a, and is disposed through an elongated hole 5 of a ring-shaped member 4 to engage with the screw rotor 1. Also,
The flat surface 2a closely engages with one end surface of the elongated hole 5 in the width direction. Note that the gate rotors 2 are arranged in opposite directions with respect to the screw rotor 1, as shown in FIG.

The medium sucked through the suction port 6 is introduced from the meshing starting point 7 between the screw rotor 1 and the gate rotor 2, and is introduced into the spiral groove of the screw rotor 1, the teeth of the gate rotor 2, the gate rotor 2, and the ring-shaped member 4. It is compressed in a closed space surrounded by the close-fitting surfaces of , and is discharged from a discharge port 9 near the engagement end point 8 and sent to the point of use. In FIG. 3, the compressed state of the sucked medium is shown by the space surrounded by the two-dot chain line.

[Problem that the invention attempts to solve]

As described above, in order to obtain a predetermined compressed medium with a screw compressor, it is necessary to form tooth profiles to ensure the meshing between the screw rotor 1 and the gate rotor 2, and also to form a tooth profile between the flat surface 2a of the gate rotor 2 and the ring. It is necessary to ensure close contact with the one end surface of the elongated hole 5 of the shaped member 4.

However, if the close contact state is perfect, as shown in FIG. 3, when the screw compressor is stopped, the compressed medium remains in the closed space. Therefore, a large startup load will be applied upon restart. Furthermore, when starting up, a starting force is required to overcome the static friction force, which requires an extremely large starting force, which has been considered a problem from an energy saving perspective.

Furthermore, screw compressors repeatedly start and stop as the amount of use fluctuates at the location where they are used, and because of the high frequency of this, there has been a need to reduce the load upon startup.

The present invention was developed in response to the above-mentioned demands, and provides a starting load reduction device for a screw compressor that reduces the load at startup, suppresses the amount of starting power, is easy to handle, and is highly reliable. The purpose is to

[Means for solving problems]

In order to achieve the above object, the present invention has an elongated hole that is attached to a case body, rotatably supports a screw rotor therein, and is penetrated by a gate rotor that engages with a spiral groove of the screw rotor. The ring-shaped member formed by the perforation is rotatably supported by the case body, and the width of the elongated hole of the ring-shaped member with which the flat surface of the gate rotor comes into close contact is adjusted along the rotational direction of the screw rotor. control to form a gap of an appropriate size with the gate rotor which is widened and penetrated into engagement, and to connect the ring-shaped member with a rotating means for rotating the ring-shaped member by an amount corresponding to the gap, and to connect the ring-shaped member to the rotating means. By means of
This constitutes a starting load reduction device for a screw compressor, which rotates the rotating means only when the screw compressor is started.

[Function] When the screw compressor is started, the ring-shaped member is rotated by the control means and the rotation means by an amount corresponding to the gap, and the compressed medium remaining in the closed space is discharged to the atmosphere, and the closed space is closed. Try to open up the space and reduce the load at startup.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, the ring-shaped member 4A is rotatably supported within the case body 3 and is disposed so as to completely enclose the screw rotor 1. As described above, the gate rotor 2 is disposed through the elongated hole 5 bored in the ring-shaped member 4A in order to have its teeth mesh with the screw rotor 1. Long hole 5
One end surface 10 is formed on the center line of the ring-shaped member 4A, and the flat surface 2a of the gate rotor 2 closely engages with it. Further, the elongated hole 5 is formed by widening its width along the rotation direction, and forms a gap 11 between the elongated hole 5 and the gate rotor 2 that is penetrated and engaged with the elongated hole 5 .

The rotating means 12 rotates the ring-shaped member 4A by an amount corresponding to the gap 11, and various structures can be applied, but in this embodiment, a link mechanism consisting of a rod 12a, a lever member 12b, a solenoid 12c, etc. is used. Adopted.

That is, one end of the rod 12a is connected to the ring-shaped member 4A and extends in the tangential direction thereof. One end of a lever member 12b is connected to the other end of the rod 12a. A solenoid 12c is engaged with the other end of the lever member 12b. Note that the spring 12d is stretched between the other end side of the lever member 12b and the immovable side.

The control means 13 is a solenoid 12 of the rotation means 12.
c, and is configured to turn on the solenoid 12c only when the screw compressor is started.

Next, the operation of this embodiment will be explained in more detail.

When the screw compressor is started, the control means 13 simultaneously operates the solenoid 12c.
The solenoid 12c pulls the lever member 12b against the spring 12d. As a result, the rod 12a moves in the tangential direction of the ring-shaped member 4A, causing the ring-shaped member 4A to rotate. By adjusting the amount of movement of the solenoid 12c and the lever ratio of the lever member, the ring-shaped member 4A rotates by an amount corresponding to the gap 11. When the ring-shaped member 4A rotates, the flat surface 2a of the gate rotor 2 and the one end surface 10 of the long hole 5 of the ring-shaped member 4A
The closed space formed by the screw rotor 1, the flat surface 2a of the gate rotor 2, and the one end surface 10 is opened to the atmosphere, and no compression chamber is formed. Therefore, the residual medium in the sealed space is discharged to the atmosphere, and the load at startup can be extremely reduced. When the screw rotor 1 starts rotating, the control means 13 turns off the solenoid 12c, the ring-shaped member 4A returns to its original position, and the sealed space is formed, so that the suction medium is compressed in a normal state. become.

This embodiment is easy to handle by simply rotating the ring-shaped member, and its rotation means 12 and control means 13 are also formed by known technology, so that the operation can be performed reliably and stably. can.

[Effects of the invention] As is clear from the above explanation, according to the invention, the load on the screw compressor at startup can be significantly reduced, energy saving can be achieved, and the system is easy to handle and has improved reliability. The benefits include:

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an axial sectional view showing the general structure of a conventional screw compressor, and FIG. 3 is a sectional view taken along the line -- in FIG. 1... Screw rotor, 2... Gate rotor, 2a... Flat surface, 3... Case body, 4,
4A...Ring-shaped member, 5...Elongated hole, 6...Suction port, 7...Matching start point, 8...Matching end point, 9...
...Discharge port, 10... One end surface, 11... Gap, 12
... Rotating means, 12a ... Rod, 12b ... Lever member, 12c ... Solenoid, 12d ... Spring,
13... Control means.

Claims (1)

[Claims for Utility Model Registration] (1) A screw rotor forming a spiral groove is pivotally supported in a ring-shaped member installed in the case body, and the screw rotor is perpendicular to the screw rotor and is pivotally supported in the case body. , a flat plate that passes through the elongated hole of the ring-shaped member and closely engages its teeth with the spiral groove, the flat surface of which is closely engaged with one end surface in the width direction of the elongated hole of the ring-shaped member; In the starting load reduction device for a screw compressor, which comprises a gate rotor arranged in the screw rotor, the width of the elongated hole of the ring-shaped member is widened along the rotational direction of the screw rotor, and the elongated hole is engaged with the elongated hole. A gap of an appropriate size is formed between the gate rotor and the ring-shaped member, and the ring-shaped member is rotatably supported by the case body, and a rotating means for rotating the ring-shaped member is connected to the ring-shaped member. , and a control means for rotating the rotation means only when the screw compressor is started is connected to the rotation means. (2) the rotation means is a rod having one end connected to the ring-shaped member and extending in a tangential direction;
According to claim 1 of the utility model registration claim, the rod is formed of a lever member that connects the other end of the rod to one end thereof, and a solenoid that engages with the other end and reciprocates the rod. The starting load reduction device for the screw compressor described above.