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CN-119053787-B - Screw compressor and refrigerating device

CN119053787BCN 119053787 BCN119053787 BCN 119053787BCN-119053787-B

Abstract

The gate (52) has a first seal line (55) and a second seal line (56). The first seal line (55) and the second seal line (56) are in an asymmetric shape with respect to a first virtual straight line (L1), and the first virtual straight line (L1) passes through a rotation center (O) of the gate rotor (51) and a first intermediate position (A) between the first seal line (55) and the second seal line (56) on the front end side of the gate (52). The spiral groove (40) has a shape corresponding to the gate (52).

Inventors

  • Gang Tian Zhongsi

Assignees

  • 大金工业株式会社

Dates

Publication Date
20260505
Application Date
20230220
Priority Date
20220328

Claims (7)

  1. 1. Screw compressor comprising a screw rotor (30) and a gate rotor (51), the screw rotor (30) having a plurality of helical grooves (40), the gate rotor (51) having a gate (52) engaging the helical grooves (40) of the screw rotor (30), characterized in that: the gate (52) has a first seal line (55) and a second seal line (56), the first seal line (55) and the second seal line (56) are in contact with a side wall surface (41) of the spiral groove (40) of the screw rotor (30), The first seal line (55) is located downstream of the second seal line (56) in the rotation direction of the shutter (52), The first seal line (55) and the second seal line (56) are in an asymmetric shape with respect to a first virtual straight line (L1), the first virtual straight line (L1) passing through a rotation center (O) of the gate rotor (51) and a first intermediate position (A) on a front end side of the gate (52) between the first seal line (55) and the second seal line (56), the first virtual straight line (L1) not passing through a base end side of the gate (52), A second virtual straight line (L2) inclined at a predetermined angle with respect to the first virtual straight line (L1), the second virtual straight line (L2) passing through a rotation center (O) of the gate rotor (51) and a second intermediate position (B) between the first seal line (55) and the second seal line (56) on a base end side of the gate (52), The spiral groove (40) has a shape corresponding to the gate (52), The angle between the first seal line (55) and the front end side of the shutter (52) is smaller than the angle between the second seal line (56) and the front end side of the shutter (52), An angle formed by the first virtual straight line (L1) and the second virtual straight line (L2) is alpha, When viewed from the axial direction of the gate rotor (51), the maximum angle formed by the central shaft (33) of the screw rotor (30) and the side wall surface (41) of the spiral groove (40) which is in contact with the first seal line (55) becomes smaller as the angle alpha becomes larger, The maximum angle is related to the shape of the gate, and the maximum angle is 145 ° or less.
  2. 2. The screw compressor of claim 1, wherein: The maximum angle is 135 ° or less.
  3. 3. The screw compressor of claim 2, wherein: The maximum angle is 120 DEG or less.
  4. 4. A screw compressor according to any one of claims 1 to 3, wherein: A corner between a bottom wall surface (42) and a side wall surface (41) of the spiral groove (40) is formed in a curved shape.
  5. 5. A screw compressor according to any one of claims 1 to 3, wherein: a first sealing end part (31) and a second sealing end part (32) are arranged at two axial ends of the screw rotor (30), The spiral groove (40) is formed between the first seal end (31) and the second seal end (32).
  6. 6. The screw compressor of claim 4, wherein: a first sealing end part (31) and a second sealing end part (32) are arranged at two axial ends of the screw rotor (30), The spiral groove (40) is formed between the first seal end (31) and the second seal end (32).
  7. 7. A refrigeration device, characterized by: The refrigeration device comprises a screw compressor (10) according to any one of claims 1 to 6, and a refrigerant circuit (1 a) for flowing a refrigerant which has been compressed by the screw compressor (10).

Description

Screw compressor and refrigerating device Technical Field The present disclosure relates to a screw compressor and a refrigeration device. Background Patent document 1 describes a technique for manufacturing a screw rotor for a screw compressor using a five-axis processing machine. In a five-axis machining center, a workpiece is machined while moving a cutting tool such as an end mill attached to a spindle and the workpiece attached to a holder. Prior art literature Patent literature Patent document 1 Japanese patent No. 4229213 Disclosure of Invention Technical problem to be solved by the invention However, the relative angle of the cutting tool with respect to the central axis of the screw rotor increases depending on the groove shape of the helical groove, and particularly when cutting the axial end portion of the helical groove, the spindle of the five-axis machining machine may interfere with the rotary table. The purpose of the present disclosure is to prevent a spindle from interfering with a rotary table when a spiral groove corresponding to a brake is machined by a five-axis machining machine by applying work to the shape of the brake. Technical solution for solving the technical problems A first aspect of the present disclosure relates to a screw compressor including a screw rotor 30 and a gate rotor 51, the screw rotor 30 having a plurality of screw grooves 40, the gate rotor 51 having a gate 52 engaged with the screw grooves 40 of the screw rotor 30, the gate 52 having a first seal line 55 and a second seal line 56, the first seal line 55 and the second seal line 56 being in contact with a side wall surface 41 of the screw grooves 40 of the screw rotor 30, the first seal line 55 and the second seal line 56 being in an asymmetric shape with respect to a first virtual straight line L1, the first virtual straight line L1 passing through a rotation center O of the gate rotor 51 and a first intermediate position a on a front end side of the gate 52 between the first seal line 55 and the second seal line 56, the screw groove 40 being in a shape corresponding to the gate 52. In the first aspect, the shape of the gate 52 is set so that the main shaft and the rotary table can be prevented from interfering with each other when the spiral groove 40 corresponding to the gate 52 is machined by the five-axis machining machine. A second aspect of the present disclosure is the screw compressor of the first aspect, wherein a second virtual straight line L2 is inclined at a predetermined angle with respect to the first virtual straight line L1, and the second virtual straight line L2 passes through a rotation center O of the gate rotor 51 and a second intermediate position B between the first seal line 55 and the second seal line 56 on a base end side of the gate 52. In the second aspect, the shape of the gate 52 is set so that the main shaft and the rotary table are prevented from interfering with each other when the spiral groove 40 corresponding to the gate 52 is machined by the five-axis machining machine. A third aspect of the present disclosure provides the screw compressor of the first or second aspect, wherein a maximum angle between the central axis 33 of the screw rotor 30 and a surface of the side wall surface 41 of the spiral groove 40, which surface contacts the first seal line 55, is 145 ° or less when viewed in the axial direction of the gate rotor 51. In the third aspect, by setting the maximum angle to 145 ° or less, the occurrence of interference between the spindle and the rotary table can be avoided when the spiral groove 40 corresponding to the gate 52 is machined by the five-axis machining machine. A fourth aspect of the present disclosure is the screw compressor of the third aspect, wherein the maximum angle is 135 ° or less. In the fourth aspect, by setting the maximum angle to 135 ° or less, it is possible to avoid interference between the main shaft and the rotary table when the spiral groove 40 corresponding to the gate 52 is machined by the five-axis machining machine. A fifth aspect of the present disclosure is based on the screw compressor of the fourth aspect, wherein the maximum angle is 120 ° or less. In the fifth aspect, by setting the maximum angle to 120 ° or less, the occurrence of interference between the spindle and the rotary table can be avoided when the spiral groove 40 corresponding to the gate 52 is machined by the five-axis machining machine. A sixth aspect of the present disclosure is the screw compressor of any one of the first to fifth aspects, wherein a corner portion between the bottom wall surface 42 and the side wall surface 41 of the spiral groove 40 is formed in a curved shape. In the sixth aspect, the spiral groove 40 can be formed by using a tapered end mill by forming the corner between the bottom wall surface 42 and the side wall surface 41 of the spiral groove 40 in a curved shape. A seventh aspect of the present disclosure is the screw compressor of any