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CN-122003558-A - Valve

CN122003558ACN 122003558 ACN122003558 ACN 122003558ACN-122003558-A

Abstract

Provided is a valve capable of smoothly varying the pressure of a back pressure fluid. A valve (V1) is provided with a housing (60) having a high-pressure space (S2) into which a high-pressure fluid (Pd) flows, back-pressure spaces (S3, S3 ') into which a back-pressure fluid (Pb) flows, and a low-pressure space (S1) into which a low-pressure fluid (Ps) flows, and a valve element (61) which is arranged in the housing (60) so as to be movable relative to each other, wherein the housing (60) has a1 st passage (73) provided between the high-pressure space (S2) and the back-pressure space (S3) and a2 nd passage (78) provided between the back-pressure space (S3') and the low-pressure space (S1), and the valve element (61) has a1 st valve core (72) for controlling the opening of the 1 st passage (73) and a2 nd valve core (77) for controlling the opening of the 2 nd passage (78), and the 1 st valve core (72) and the 2 nd valve core (77) are linked in a manner that the respective movement directions are opposite to each other in the opening direction and closing direction.

Inventors

  • Kurihara Taichi

Assignees

  • 伊格尔工业股份有限公司

Dates

Publication Date
20260508
Application Date
20241022
Priority Date
20231027

Claims (7)

  1. 1. A valve, having: A housing having a high pressure space into which a high pressure fluid flows, a back pressure space into which a back pressure fluid flows, and a low pressure space into which a low pressure fluid flows, and A valve body disposed in the housing so as to be movable relative to each other, Wherein, the The housing has a1 st passage provided between the high pressure space and the back pressure space and a2 nd passage provided between the back pressure space and the low pressure space, The valve element has a1 st valve core portion for controlling the opening degree of the 1 st passage and a 2 nd valve core portion for controlling the opening degree of the 2 nd passage, The 1 st valve core portion and the 2 nd valve core portion are interlocked in such a manner that respective moving directions are opposite in an opening direction and a closing direction.
  2. 2. The valve of claim 1, wherein, The back pressure space is a1 st back pressure space capable of communicating with the 1 st passage and a2 nd back pressure space capable of communicating with the 2 nd passage and partitioned from the 1 st back pressure space.
  3. 3. The valve of claim 1, wherein, The valve body has a coupling portion that couples the 1 st valve body portion and the 2 nd valve body portion.
  4. 4. The valve of claim 3, wherein, The housing and the connecting portion are sealed.
  5. 5. The valve of claim 3, wherein, The valve has a biasing unit for biasing the valve element in one direction, The valve is configured such that the pressure Pd of the high-pressure fluid, the pressure Pb of the back-pressure fluid, the pressure Ps of the low-pressure fluid, the effective cross-sectional area a of the 1 st valve core portion, the effective cross-sectional area B of the connecting portion, the effective cross-sectional area C of the 2 nd valve core portion, and the acting force F sp of the biasing means satisfy the following mathematical formula 1: [ math 1] 。
  6. 6. The valve of claim 5, wherein, The effective cross-sectional area a and the effective cross-sectional area C are larger than the effective cross-sectional area B.
  7. 7. The valve according to any one of claims 1 to 6, wherein, The housing has a1 st valve seat provided in the 1 st passage and a2 nd valve seat provided in the 2 nd passage.

Description

Valve Technical Field The present invention relates to valves, for example valves for controlling pressure. Background As one of compressors used in various industrial fields, there is a scroll compressor which has high compression efficiency and low noise, and is therefore used in various fields such as refrigeration cycle. The scroll compressor has a structure including a fixed scroll having spiral wraps and a movable scroll having spiral wraps, and a rotating shaft for eccentrically rotating the movable scroll, and pressurizes a fluid serving as a refrigerant supplied from a suction chamber on an outer diameter side of both scrolls by relatively sliding the movable scroll with respect to the fixed scroll in association with the eccentric rotation, and discharges a high-pressure refrigerant from a discharge port formed in a center of the fixed scroll. In such a scroll compressor, when the pressure of the discharge chamber from which the refrigerant compressed by the scroll compression mechanism is discharged increases, a force acts in a direction to separate the movable scroll from the fixed scroll. The scroll compressor of patent document 1 is provided with an air supply passage that communicates a discharge chamber with a back pressure chamber formed on the back surface side of the movable scroll. A part of the air supply passage is a slit functioning as a fixed throttle. A part of the compressed refrigerant in the discharge chamber is depressurized by the slit and adjusted to be supplied to the back pressure chamber, and the movable scroll is pressed against the fixed scroll, so that the movable scroll is prevented from being separated from the fixed scroll. The scroll compressor is provided with a suction passage that communicates the back pressure chamber with the suction chamber. The pumping channel is provided with a back pressure control valve. The back pressure control valve has a front housing, a housing, and a valve spool. The front case and the housing form a 1 st valve chamber communicating with the ejection chamber, a2 nd valve chamber communicating with the back pressure chamber, and a 3 rd valve chamber communicating with the suction chamber. The valve body is reciprocatingly accommodated in the front case and the housing, and forms a BS valve that varies a flow rate of the suction passage between the back pressure chamber and the suction chamber together with a valve seat provided between the 3 rd valve chamber and the 2 nd valve chamber. The valve body is moved in the opening direction or the closing direction according to the discharge pressure, the back pressure, and the suction pressure, and the opening degree of the BS valve can be adjusted. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2010-150967 (pages 5 to 8, FIG. 1) Disclosure of Invention Problems to be solved by the invention In the scroll compressor of patent document 1, when the back pressure tends to be insufficient, the valve body of the back pressure control valve moves in the closing direction, and the BS valve opening is small or closed. At this time, in the scroll compressor, since the refrigerant is continuously supplied to the back pressure chamber through the gas supply passage, the pressure of the back pressure chamber can be increased. When the back pressure tends to be excessive, the valve body of the back pressure control valve moves in the opening direction, and the opening degree of the BS valve increases, so that the pressure in the back pressure chamber can be reduced. However, even if the back pressure tends to be excessive and the opening degree of the BS valve is large, the refrigerant is continuously supplied to the back pressure chamber through the gas supply passage, and therefore, there is a problem in that it takes time until the pressure of the back pressure chamber becomes an appropriate pressure. The present invention has been made in view of such a problem, and an object thereof is to provide a valve capable of smoothly varying the pressure of a back pressure fluid. Means for solving the problems In order to solve the above problems, a valve according to the present invention includes a housing having a high pressure space into which a high pressure fluid flows, a back pressure space into which a back pressure fluid flows, and a low pressure space into which a low pressure fluid flows, and a valve body disposed in the housing so as to be movable relative to each other, wherein the housing has a1 st passage provided between the high pressure space and the back pressure space and a 2 nd passage provided between the back pressure space and the low pressure space, the valve body has a1 st valve core portion that controls an opening degree of the 1 st passage and a 2 nd valve core portion that controls an opening degree of the 2 nd passage, and the 1 st valve core portion and the 2 nd valve core portion are linked so that respective movement directi