Control valve for a variable displacement compressor

Patent metadata

Field	Value
Publication number	US-9651037-B2
Application number	US-201313861354-A
Country	US
Kind code	B2
Filing date	Apr 11, 2013
Priority date	Apr 23, 2012
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A control valve according to an embodiment includes a body having a valve hole and a guiding passage formed coaxially with the valve hole, an actuating rod, slidably supported along the guiding passage, which is provided with a valve element, a solenoid for applying the solenoidal force in an opening or closing direction of a valve section to the valve element via the actuating rod, and a seal section, provided between the actuating rod and the guiding passage, which houses a sealing member for restricting the leakage of refrigerant from a high pressure side to a low pressure side. The actuating rod and the guiding passage are configured such that the clearance, between the actuating rod and the guiding passage, which is at a higher-pressure side of the seal section is larger than the clearance which is at a lower-pressure side of the seal section.

First claim

What is claimed is:

1. A control valve for a variable displacement compressor for varying a discharging capacity of the variable displacement compressor by controlling a flow rate of refrigerant to be introduced from a discharge chamber of the compressor to a crankcase of the compressor, the control valve comprising:
a body having a discharge pressure chamber that communicates with the discharge chamber, a crank pressure chamber that communicates with the crankcase, a valve hole provided in a passage joining the discharge pressure chamber to the crank pressure chamber, and a guiding passage formed coaxially with the valve hole;
an actuating rod slidably supported along the guiding passage, the actuating rod having a valve element configured to open and close a valve section such that the valve element touches and leaves the valve hole;
a solenoid configured to apply force in an opening or closing direction of the valve section to the valve element via the actuating rod; and
a seal section provided between the actuating rod and the guiding passage, the seal section containing a sealing member therein where the sealing member serves to restrict leakage of the refrigerant from a high pressure side to a low pressure side,
wherein the seal section is an annular recessed groove formed in either one of an inner surface of the guiding passage into which the actuating rod is inserted and an outer surface of the actuating rod that is inserted into the guiding passage,
wherein the sealing member is an annular member fitted in the recessed groove in such a manner that the sealing member is supported by either one of the body and the actuating rod and is in contact with and slidable relative to an other one of the body and the actuating rod,
wherein the recessed groove has a width in an axial direction larger than a width in the axial direction of a cross section of the sealing member, so that a space is present between a higher-pressure-side surface of the recessed groove and the sealing member,
wherein the actuating rod and the guiding passage are configured such that a clearance, between the actuating rod and the guiding passage, which is at a higher-pressure side adjacent the recessed groove is larger than a clearance therebetween which is at a lower-pressure side adjacent the recessed groove, and
wherein a clearance length in the axial direction on the higher-pressure side of the recessed groove is shorter than a clearance length in the axial direction on the lower-pressure side of the recessed groove.

2. A control valve, for a variable displacement compressor, according to claim 1 , further comprising a filter configured to restrict entry of foreign particles contained in the refrigerant when the refrigerant is introduced from the discharge chamber to the discharge pressure chamber,
wherein the clearance therebetween, which is on the higher-pressure side of the seal section, is larger than a width of each mesh in the filter.

3. A control valve, for a variable displacement compressor, according to claim 1 , wherein the clearance at the lower-pressure side adjacent the recessed groove is sized such that the sealing member being deformed owing to a pressure difference between the higher-pressure side and the lower-pressure side is not stuck in the clearance at the lower-pressure side.

4. A control valve, for a variable displacement compressor, according to claim 3 , further comprising a filter that prevents entry of foreign materials contained in the refrigerant introduced from the discharge chamber to the discharge pressure chamber,
wherein the clearance at the lower-pressure side is smaller than a width of a mesh of the filter.

5. A control valve for a variable displacement compressor for varying a discharging capacity of the variable displacement compressor by controlling a flow rate of refrigerant to be introduced from a discharge chamber of the compressor to a crankcase of the compressor, the control valve comprising:
a body having a discharge pressure chamber that communicates with the discharge chamber, a crank pressure chamber that communicates with the crankcase, a valve hole provided in a passage joining the discharge pressure chamber to the crank pressure chamber, and a guiding passage formed coaxially with the valve hole;
an actuating rod slidably supported along the guiding passage, the actuating rod having a valve element configured to open and close a valve section such that the valve element touches and leaves the valve hole;
a solenoid configured to apply force in an opening or closing direction of the valve section to the valve element via the actuating rod; and
a seal section provided between the actuating rod and the guiding passage, the seal section containing a sealing member therein where the sealing member serves to restrict leakage of the refrigerant from a high pressure side to a low pressure side,
wherein the seal section is an annular recessed groove formed in either one of an inner surface of the guiding passage into which the actuating rod is inserted and an outer surface of the actuating rod that is inserted into the guiding passage,
wherein the sealing member is an annular member fitted in the recessed groove in such a manner that the sealing member is supported by either one of the body and the actuating rod and is in contact with and slidable relative to an other one of the body and the actuating rod, and
wherein the actuating rod and the guiding passage are configured such that a clearance, between the actuating rod and the guiding passage, which is at a higher-pressure side adjacent the recessed groove is larger than a clearance therebetween which is at a lower-pressure side adjacent the recessed groove;
wherein the guiding passage connects the discharge pressure chamber to the crank pressure chamber,
wherein the seal section contains the sealing member therein where the sealing member serves to restrict the leakage of the refrigerant from the discharge pressure chamber to the crank pressure chamber, and
wherein the actuating rod and the guiding passage are configured such that the higher-pressure-side clearance at a discharge pressure chamber side of the seal section, between the actuating rod and the guiding passage, is larger than the lower-pressure-side clearance at a crank pressure chamber side thereof therebetween.

6. A control valve for a variable displacement compressor for varying a discharging capacity of the variable displacement compressor by controlling a flow rate of refrigerant to be introduced from a discharge chamber to a crankcase of the compressor, the control valve comprising:
a body having a discharge pressure chamber that communicates with the discharge chamber, a crank pressure chamber that communicates with the crankcase, a valve hole provided in a passage joining the discharge pressure chamber to the crank pressure chamber, and a guiding passage formed coaxially with the valve hole;
an actuating rod slidably supported along the guiding passage, the actuating rod having a valve element configured to open and close a valve section such that the valve element touches and leaves the valve hole;
a solenoid configured to apply force in an opening or closing direction of the valve section to the valve element via the actuating rod; and
a seal section provided between the actuating rod and the guiding passage, the seal section containing a sealing member therein where the sealing member serves to restrict leakage of the refrigerant from a high pressure side to a low pressure side,
wherein the actuating rod and the guiding passage are configured such that a clearance, between the actuating rod and the guiding passage, which is at a higher-pressure side of the seal section is larger than a clearance therebetween which is at a lower-pressur

Assignees

• Tgk Co Ltd
• Tgk Co Ltd

Inventors

• Sakakibara Hidekazu
• Kobayashi Takashi
• Miyazaki Michiyoshi
• Tamotsu Kotaka
• Shimazaki Satoshi

Classifications

• Y10T137/85978

  With pump · CPC title

• F04B49/22

  by means of valves (F04B49/03 takes precedence) · CPC title

• F04B2027/1845

  Crankcase pressure · CPC title

• F04B2027/1827

  between crankcase and discharge chamber · CPC title

• Y10T137/794

  With means for separating solid material from the fluid · CPC title