Control valve for compressors and manufacturing method thereof
AssigneePacific Industrial Co., Ltd.
InventorsSatoru Okada, Takayuki Sakai, Takaaki Ichikawa
Life of this patent
Estimating the term…
Abstract
A highly accurate and relatively inexpensive control valve for a compressor. The control valve includes a pressure sensitive portion that has a metal diaphragm, which is machined with a relatively low cost. The diaphragm is held between flanges. The pressure sensitive portion is attached to a control valve portion after being subjected to a pressure leak test. The control valve portion has an engaging piece and a positioning surface. The flange contacts the positioning surface and is fixed by the engaging piece. The positioning surface is formed such that the interval between the diaphragm and the top of the valve chamber becomes a predetermined value.
Claims17
A control valve of a variable displacement compressor including a suction passage in which refrigerant gas at a relatively low pressure flows, a discharge pressure zone in which the refrigerant gas compressed at a relatively high pressure flows, a crank chamber that accommodates a cam, and a supply passage that connects the discharge pressure zone to the crank chamber, wherein the control valve comprises:
- a body, which accommodates a valve body that opens or closes a valve hole connected to the supply passage;
- and
- a pressure sensitive portion, which is fixed to the body for detecting the pressure in the suction passage, and the pressure sensitive portion includes:
- a diaphragm, which is deformed in relation to the pressure in the suction passage;
- a first case, which has a first flange and cooperates with the diaphragm to define a pressure sensitive chamber;
- and
- a second case, which has a second flange that cooperates with the first flange to hold the diaphragm, wherein the outer periphery of the first flange is welded to the outer periphery of the second flange,
- wherein the body has a positioning surface for positioning the diaphragm by contacting the second case, and wherein the positioning surface is formed such that the interval between the diaphragm and the valve hole becomes a predetermined value.
A control valve of a variable displacement compressor including a suction passage in which refrigerant gas at a relatively low pressure flows, a discharge pressure zone in which the refrigerant gas compressed at a relatively high pressure flows, a crank chamber that accommodates a cam, and a supply passage that connects the discharge pressure zone to the crank chamber, wherein the control valve comprises:
- a pressure sensitive portion, which detects the pressure in the suction passage, and the pressure sensitive portion includes:
- a diaphragm, which is deformed in relation to the pressure in the suction passage;
- a first case, which has a first flange and cooperates with the diaphragm to define a pressure sensitive chamber;
- and
- a second case, which has a second flange that cooperates with the first flange to hold the diaphragm;
- a body, which is fixed to the pressure sensitive portion and accommodates a valve body for opening or closing a valve hole connected to the supply passage, wherein said body includes a positioning surface, which is formed in the body for positioning the diaphragm by contacting the second case, wherein the positioning surface is formed such that the interval between the diaphragm and the valve hole becomes a predetermined value.
A method for manufacturing a control valve of a variable displacement compressor, wherein the control valve includes a body, which accommodates a valve body that changes the opening size of a valve hole, and a pressure sensitive portion, which is attached to the body for detecting the pressure in the compressor, and the method is characterized by the steps of:
- forming a positioning surface in the body at a position corresponding to a predetermined interval from the valve hole;
- accommodating a pressure sensitive spring and a pair of dolly blocks, which holds opposite ends of the pressure sensitive spring, in a first case that has a first flange and a pressure setting hole;
- accommodating a connecting member in a second vase that has a second flange;
- fixing the first case and the second case by clamping a diaphragm between the first flange and the second flange;
- setting the pressure in a pressure sensitive chamber, which is defined by the diaphragm and the first case, to a predetermined value, wherein said step of setting the pressure includes the steps of:
- depressurizing the pressure sensitive chamber by means of the pressure setting hole;
- closing the pressure setting hole by a seal body;
- and
- welding the seal body to the first case;
- and
- attaching the pressure sensitive portion to the body by enabling the second case to contact the positioning surface of the body.
Dependencies are inferred from the claim text.