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CN-121993615-A - Pilot-operated control valve

CN121993615ACN 121993615 ACN121993615 ACN 121993615ACN-121993615-A

Abstract

A pilot control valve for preventing a valve member of a main valve body from falling off comprises a valve body having a main valve chamber and a pilot valve chamber therein and having an inflow passage and an outflow passage, wherein an end portion of the outflow passage on the main valve chamber side is a main valve port, the main valve body opening and closing the main valve port, the pilot valve body opening and closing a pilot passage, and a driving device for driving the pilot valve body, wherein a main valve seat is provided around the main valve port and is in contact with the main valve body, the main valve body comprises a piston member supported in the main valve chamber in a vertically movable manner and a valve member holding portion having an annular recess in a lower surface portion, and the valve member is accommodated in the valve member holding portion and is in contact with and separated from the main valve seat. The pilot control valve includes a seal portion that prevents fluid from flowing between the main valve chamber and the main valve port through a gap between the piston member and the valve member when the valve is closed, and the seal portion is formed outside the main valve seat.

Inventors

  • KIBUNE NISHI

Assignees

  • 株式会社不二工机

Dates

Publication Date
20260508
Application Date
20251027
Priority Date
20241101

Claims (7)

  1. 1. A pilot control valve is characterized by comprising: a valve body having a main valve chamber and a pilot valve chamber inside, the valve body having an inflow path for flowing fluid into the main valve chamber and an outflow path for flowing the fluid out of the main valve chamber, an end portion of the outflow path on the main valve chamber side being a main valve port; A main valve element that opens and closes the main valve port by moving forward and backward with respect to the main valve port; a pilot passage penetrating the main valve body to selectively communicate the pilot valve chamber with the outflow passage; a pressure equalizing passage that communicates the main valve chamber and the pilot valve chamber; a pilot valve element for opening and closing the pilot passage, and An electric drive device that drives the pilot spool, When the direction from the main valve port to the main valve element is set to be "up" and the direction from the main valve element to the main valve port is set to be "down", In the valve body, a main valve seat is provided around the main valve port, The main valve seat is a part which is abutted with the main valve core, The main valve core has: a piston member supported in the main valve chamber so as to be movable up and down, the piston member having a valve member holding portion on a lower surface thereof, the valve member holding portion being an annular recess, and An annular valve member which is housed in the valve member holding portion so that at least a portion of a lower surface thereof facing the main valve seat is exposed, and which opens and closes the main valve port by coming into contact with and separating from the main valve seat, The pilot control valve has a seal portion that prevents the fluid from flowing between the main valve chamber and the main valve port through a gap between the piston member and the valve member when the valve is closed, The sealing portion is formed outside the main valve seat.
  2. 2. The pilot-operated valve of claim 1, wherein, The valve body has an annular protruding portion which is formed inside the main valve opening and protrudes upward with respect to the periphery, The protruding part is provided with the main valve seat, The sealing portion is formed outside the protruding portion.
  3. 3. The pilot-operated valve of claim 1, wherein, The piston member has an annular peripheral wall portion formed on a lower surface portion so as to surround the valve member holding portion, The lower end portion of the peripheral wall portion is bent inward in the center axial direction of the piston member, whereby the valve member is held in the valve member holding portion, and the outer peripheral portion of the valve member is pressed upward to form the seal portion.
  4. 4. The pilot-operated valve of claim 3, wherein, An annular plate member is interposed between the lower end portion of the inwardly bent peripheral wall portion and the valve member.
  5. 5. The pilot-operated valve of any one of claims 1 to 4, The valve member is provided with a low pressure introduction passage which communicates with the main valve port when the valve is closed, introduces a low pressure on the outflow passage side to the sealing portion side of the valve member, and constitutes at least a part of a flow path from the outflow passage to the sealing portion.
  6. 6. The pilot-operated valve of claim 5, wherein, The low pressure introduction path includes: An annular path extending annularly along a circumferential direction of the valve member on an upper surface of an outer peripheral portion of the valve member, and And a connection path that communicates the annular path with the main valve port.
  7. 7. The pilot-operated valve of claim 6, wherein, The connection path includes: one or more vertical paths extending in the up-down direction along the inner peripheral surface of the valve member, and One or more horizontal paths extending from an upper end portion of the vertical path along an upper surface of the valve member in a radial direction of the valve member.

Description

Pilot-operated control valve Technical Field The present invention relates to a pilot control valve, and more particularly to a support structure for a main valve body of a rubber valve for opening and closing a main valve port. Background A pilot control valve (hereinafter, sometimes simply referred to as a "control valve") is used in a refrigeration cycle apparatus having a refrigerant circuit, such as an air conditioner, a refrigeration apparatus, and a refrigerating apparatus, in which a pilot valve is opened and closed by an electric drive device, such as a solenoid or a motor, and a main valve is opened and closed in response to the opening and closing of the pilot valve. In such a control valve, a valve member made of rubber or a resin material may be used in order to improve the sealability (fluid blocking property when closing the valve) of the main valve port and prevent the valve from leaking. For example, fig. 8 and 9 show an example of a conventional pilot control valve (solenoid valve). The control valve 51 includes a main valve body 18 in the main valve chamber 13, and the main valve body 18 opens and closes a main valve port 16 formed in an end portion of the outflow path 15 on the main valve chamber 13 side. The main valve body 18 has a piston member 19 supported so as to be slidable up and down, and a valve member 22 provided on the lower surface of the piston member 19, and opens and closes the main valve port 16 by the valve member 22 made of a rubber material coming into contact with and separating from the main valve port 16. The valve member 22 is accommodated in an annular recess (referred to as "valve member holding portion" in the present application) 21 formed in the lower surface of the piston member 19, and is supported by bending (caulking) a lower end portion 20a of a peripheral wall portion (peripheral wall portion on the outer peripheral side) 20 surrounding the recess 21 toward the inside of the recess 21, and caulking a fixing washer 52 to the inner peripheral side of the recess 21. In addition, when the gasket 52 is swaged, the valve member 22 is crushed upward, and the upper surface of the valve member 22 is pressed against the top surface of the valve member holding portion 21, thereby forming the sealing portion 53. The seal portion 53 functions to prevent the refrigerant from leaking from the main valve chamber 13 to the outflow passage 15 (main valve port 16) through the gap between the piston member 19 (inner surface of the valve member holding portion 21) and the valve member 22 when the valve is closed (the state of fig. 8 and 9). Patent document 1 below discloses a pilot control valve of this type. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2024-12977 However, in the conventional control valve 51, since the pressure in the main valve chamber 13 communicating with the inflow passage 14 is high and the pressure in the main valve port 16 communicating with the outflow passage 15 is low, a load due to the pressure difference is applied to the valve member at the time of closing the valve shown in fig. 8 and 9 (see arrow F in fig. 9). Therefore, the valve member 22 may be separated from the piston member 19 (the valve member holding portion 21) when the valve is opened. Disclosure of Invention Accordingly, an object of the present invention is to prevent a valve member provided in a main valve body from coming off. In order to solve the above-mentioned problems, a pilot control valve according to the present invention includes a valve body having a main valve chamber and a pilot valve chamber inside, and having an inflow path for allowing a fluid (e.g., a refrigerant) to flow into the main valve chamber and an outflow path for allowing the fluid to flow out of the main valve chamber, wherein an end portion of the outflow path on the main valve chamber side is a main valve port; the valve includes a main valve body having a main valve seat around the main valve opening and a main valve seat being a portion in contact with the main valve seat, a pilot passage passing through the main valve body and selectively communicating the pilot valve chamber and an outflow passage, a pressure equalizing passage communicating the main valve chamber and the pilot valve chamber, a pilot valve body opening and closing the pilot passage, and an electric drive device driving the pilot valve body, the main valve body having a main valve seat around the main valve opening and the main valve seat being a portion in contact with the main valve seat when the main valve seat is set to "up" and the main valve seat is set to "down" in a direction from the main valve opening, the main valve body having a piston member supported in the main valve chamber so as to be movable up and down, the lower surface having a valve member holding portion in the form of an annular recess, and an annular valve member being housed in the valve member holdin