JP2001330167A - Valve gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve gear securing durability in a light metal-made valve housing and preventing an occurrence of liquid sealing or a lowering of anti-loosening load caused by creeping in a resin valve element with a cylindrical liner. SOLUTION: A valve body portion 10 abutting to a valve seat part 6 of a main valve element 9 is composed of a synthetic resin, and the metallic cylindrical liner 11 is attached to an outer circumferential part of the valve body portion 10. A guide sleeve member 7 made of same metal the as the cylindrical liner 11 is fixed to the valve housing 1 and the main valve element 9 is provided slidably in a valve axial direction inside the guide sleeve member 7 by the cylindrical liner 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for opening and closing a flow path of a refrigerant circuit for air conditioning, and more particularly to a pilot-type electromagnetic on-off valve.

[0002]

2. Description of the Related Art A pilot-type electromagnetic on-off valve is known as an electromagnetic on-off valve for opening and closing a flow path of a refrigerant circuit for air conditioning. The pilot-type solenoid on-off valve has a pilot passage in a valve body (main valve body), and opens and closes the pilot passage by a pilot valve driven by an electromagnetic coil device. The valve element is displaced in the valve axial direction with respect to the valve housing by the valve opening / closing force due to the pressure difference and the spring force of the valve spring to open / close the valve port.

A pilot type solenoid on-off valve of this type is disclosed in Japanese Patent Application Laid-Open No. 59-112273 and Japanese Patent Application Laid-Open No. 11-34414.
No. 5 publication.

[0004]

SUMMARY OF THE INVENTION In the above-mentioned pilot type solenoid on-off valve and other types of valve devices, in order to obtain excellent valve shut-off performance with respect to a valve seat provided by a metal valve housing, It has been considered that the body is made of a synthetic resin such as PTFE (polytetrafluoroethylene) to improve the fit between the valve seat and the valve body to enhance the sealing property of the valve seat.

Further, in order to obtain the wear resistance of the valve body,
It has been considered that a metal tubular liner is fitted around the outer periphery of a synthetic resin valve body (valve body portion), and the valve body slides against the valve housing with the tubular liner. . The term "made of metal" as used herein means a metal other than light metal such as stainless steel and brass, and the light metal is a metal containing a light alloy such as aluminum and an aluminum alloy.

However, if the valve housing is made of a light metal such as aluminum to reduce the weight, friction between the valve housing and the metallic tubular liner increases the wear of the sliding surface of the valve housing liner. There is a problem that metal corrosion (electrolytic corrosion) occurs and the durability of the valve housing is reduced.

In the above-described resin valve body with a cylindrical liner, it is necessary to couple the cylindrical liner to the valve body so that the cylindrical liner and the valve body do not shift in the axial direction. This connection method includes caulking and press fitting.

However, in the case of caulking, the selection of the material of the valve body portion is limited, and the primary pressure accumulates in the gap between the cylindrical liner and the valve body portion sealed by caulking, There is a possibility that a so-called liquid seal is generated, and expansion and destruction are caused by pressure reduction when the valve is opened. For this reason, it is necessary to provide a gas vent hole on the side of the tubular liner.

In the case of press-fitting, the retaining load is reduced due to creep, and in long-term use, the cylindrical liner may be displaced and displaced with respect to the valve body and may come off.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a light metal valve housing, the durability of the valve housing is ensured. An object of the present invention is to provide a valve device which does not cause sealing or lowering of a retaining load due to creep, and has a small magnetic flux loss in an electromagnetic type.

[0011]

In order to achieve the above object, a valve device according to the present invention has a valve housing made of a light metal such as aluminum, and a piston-shaped valve body is provided with respect to the valve housing. By displacing the valve body in the valve axial direction, the valve body separates from and closes to a valve seat formed in the valve housing, and the valve device opens and closes a valve port defined by the valve seat. A valve body portion that is in contact with the valve seat is made of synthetic resin, a metal tubular liner is attached to an outer peripheral portion, and a metal guide sleeve member similar to the tubular liner is fixed to the valve housing. The valve body is fitted in the guide sleeve member with the cylindrical liner so as to be slidable in the valve axis direction.

According to a second aspect of the present invention, in the valve device according to the first aspect of the present invention, the valve body has a pilot passage in the valve main body, and the pilot passage is controlled by a pilot valve driven by an electromagnetic coil device. Opening and closing are performed, the valve body is displaced in the valve axial direction with respect to the valve housing by a valve opening / closing force and a spring force of a valve spring due to a pressure difference between the front and rear of the valve body generated by opening and closing of the pilot passage,
A pilot-type electromagnetic on-off valve for opening and closing the valve port, wherein the pilot valve is formed of a non-magnetic material as a separate component from the plunger of the electromagnetic coil device.

According to a third aspect of the present invention, in the valve device according to the first aspect of the present invention, the valve body has a pilot passage in the valve main body, and the pilot passage is controlled by a pilot valve driven by an electromagnetic coil device. Opening and closing are performed, the valve body is displaced in the valve axial direction with respect to the valve housing by a valve opening / closing force and a spring force of a valve spring due to a pressure difference between the front and rear of the valve body generated by opening and closing of the pilot passage,
A pilot-type electromagnetic on-off valve for opening and closing the valve port, wherein when the electromagnetic coil device is not energized, the pilot valve is located at a position where the pilot passage opens, and a pressure difference between the front and rear of the valve body. Is substantially eliminated, the valve body is located at a valve opening position by the spring force of the valve spring, and when energizing the electromagnetic coil device, the pilot valve is located at a position where the pilot passage closes the pilot passage, A current-closing pilot-type solenoid on-off valve, wherein the valve element is located at a valve closing position against a spring force of the valve spring by a valve closing force due to a pressure difference between the front and rear of the valve element.

According to a fourth aspect of the present invention, in the valve device according to the first aspect of the present invention, the valve spring is provided between the cylindrical liner and the valve housing, and the displacement of the valve body in the valve opening direction is limited. The valve body portion is regulated by abutting on a fixed member on the valve housing side, and the valve body portion has an outer flange portion for preventing a liner from being removed at an end on the fixed member side. It is.

In the valve device according to the first aspect of the present invention,
The valve body abuts on the valve seat with a valve body portion made of synthetic resin, and a metallic cylindrical liner mounted on the outer peripheral portion of the valve body is brought into contact with the guide sleeve member on the valve housing side by the same kind of metal. Displaced in the valve axis direction with respect to the housing.

In the valve device according to the second aspect of the present invention,
The valve device has a valve body structure as described above, and is configured as a pilot-type electromagnetic on-off valve having a pilot valve driven by an electromagnetic coil device, and the pilot valve is made of a nonmagnetic material with a plunger of the electromagnetic coil device. Are configured as separate parts. This prevents the magnetic flux generated by the electromagnetic coil device from being transmitted to the pilot valve.

In the valve device according to the third aspect of the present invention,
Having a valve body structure as described above, when the coil is not energized, the pilot valve is located at the position where the pilot passage opens, so that the pressure difference before and after the valve body is substantially eliminated,
The valve element is located at the valve opening position by the spring force of the valve spring, whereas the valve is closed by the pressure difference between the front and rear of the valve element when the coil is energized, because the pilot valve is located at the point where the pilot passage closes. It is configured as a current-closing pilot-type solenoid on-off valve whose body is located at a valve closing position against the spring force of the valve spring.

In the valve device according to the fourth aspect of the present invention,
The cylindrical liner is urged in the valve opening direction by the spring force of the valve spring, and the displacement of the valve body in the valve opening direction is regulated by the valve body contacting the fixed side member on the valve housing side. The tubular liner is prevented from coming off by an outer flange provided at the end on the side of the fixed side member.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show one embodiment of a valve device according to the present invention.

The valve device has a valve housing 1 made of a light metal such as aluminum or an alloy thereof. The valve housing 1 is provided with an inlet port 2 and an outlet port 3 which are different in height, a valve chamber 4 communicating directly with the inlet port 2, a valve port 5 communicating the valve chamber 4 with the outlet port 3, and a valve chamber 4 And a valve seat 6 formed on the lower bottom portion of the valve port, and the valve seat 6 defines an open end of the valve port 5 on the valve chamber 4 side.

A guide sleeve member 7 is housed in the valve chamber 4 together with a suction element 21 and an O-ring 8 of an electromagnetic coil device 20 which will be described later, and these are swaged by swaging the swaging portion 1b of the valve housing 1. 1 b and the stepped portion 1 a of the valve housing 1. The guide sleeve member 7 is made of a metal such as stainless steel. The lower opening is open to the valve chamber 4, but the upper opening is closed by the flat bottom surface 21 a of the suction element 21.

A piston-shaped main valve body 9 is fitted in the guide sleeve member 7 so as to be movable in the vertical direction (valve shaft direction). The main valve body 9 is a valve body that opens and closes the valve port 5 by being separated from and brought into contact with the valve seat portion 6. The main valve body 9 is in contact with the valve seat portion 6 to form a main portion of the main valve body 9. It comprises a valve body 10 made of a synthetic resin such as ethylene) and a metallic tubular liner 11 fitted and mounted on the outer periphery of the valve body 10.

The cylindrical liner 11 is made of the same kind of metal as the guide sleeve member 7 such as stainless steel. The main valve body 9 is slidable in the guide sleeve member 7 in the valve axial direction with the cylindrical liner 11. Mated.

The bottom of the valve chamber 4 and the lower end 1 of the cylindrical liner 11
1a, a valve spring 12 is provided. Valve spring 1
2 urges the main valve body 9 upward in the figure, that is, in the valve opening direction in which the main valve body 9 is separated from the valve seat 6.

The displacement of the main valve body 9 in the valve opening direction is controlled by the valve body 1
0 is the flat bottom surface 21 of the suction element 21.
The upper end of the valve body 10 is provided with an outer flange 10b for preventing the liner from being removed. The outer flange portion 10b abuts on the upper end portion 11b of the cylindrical liner 11 to prevent the cylindrical liner 11 from being displaced upward with respect to the valve body portion 10, thereby preventing the liner from being removed in that direction.

The main valve body 9 is located between the suction valve 21 and the valve rear chamber 1.
3 is defined. At the center of the main valve body 9 is a valve rear chamber 13.
A pilot passage 14 is formed to connect the valve chamber (valve front chamber) 4 with the pilot passage 14. Thereby, the valve rear chamber 13 is
The throttle passage 15 and the pilot passage 14 formed by the gap between the guide sleeve member 7 and the cylindrical liner 11 communicate with the valve chamber 4.

A pilot valve seat 16 is formed around the upper end opening of the pilot passage 14. The pilot valve 17 is moved toward and away from the pilot valve seat 16 so that the pilot passage 14 is opened and closed (communication cutoff). It is supposed to be.

The pilot valve 17 is formed of a non-magnetic material as a needle valve body.
And the flange portion 17a on the base side (upper end) is connected to the plunger 23 of the electromagnetic coil device 20.
A spring 18 for urging the pilot valve 17 in the valve opening direction (upward) is provided between the flange portion 17a and the suction element 21.

The electromagnetic coil device 20 includes a suction element 21 fixed to the valve housing 1, a plunger tube 24 fixed to the plunger 21, a plug member 25 for closing the upper end of the plunger tube 24, and a plunger tube 2
A plunger 23 movably provided in the housing 4 and an outer housing member 27 fixed to the plug member 25 by bolts 26.
An electromagnetic coil portion 28 provided outside the plunger tube 22, a coil cover 30 having a coil energizing connector portion 29, and a plug member 25 of the plunger 23.
And a synthetic resin stop ring 31 provided on the side.

The plunger suction section 21b of the suction element 21 is formed in a conical shape, and the end 23a of the plunger 23 facing the suction element 21 is formed in a conical shape equivalent to the conical shape of the plunger suction section 21b.

Next, the operation of the valve device having the above configuration will be described. When the power is not supplied to the electromagnetic coil unit 28 of the electromagnetic coil device 20, the power is not supplied to the pilot valve 1 by the spring force of the spring 18 as shown in FIG.
7. The plunger 23 is lifted, and the plunger 23 is located at a rising position where it comes into contact with the plug member 25 via the stopper ring 31. At this time, the pilot valve 17 separates from the pilot valve seat 16 and the pilot passage 14
Is opened. Since the stop ring 31 is made of a synthetic resin, no metal collision sound is generated at this time.

When the pilot passage 14 is open, the valve rear chamber 13 is substantially in the same pressure state as the valve chamber 4, and the pressure difference before and after the main valve body 9 is substantially eliminated, or the inlet valve is closed. Outlet port 3 through valve port 5 from port 2
The internal pressure of the valve rear chamber 13 becomes lower than the internal pressure of the valve chamber 4 due to the flow of fluid flowing to the valve chamber 4 (when the flow rate is large), and the valve opening force due to this pressure difference and the spring force of the valve spring 12 cause the main valve body 9 to open. The main valve 9 is maintained at the valve opening position by these forces.

At this time, an upward force acts on the cylindrical liner 11 by the spring force of the valve spring 12, but the upper end surface 10a of the valve body 10 contacts the bottom surface 21a of the suction element 21 and the main valve body 9 is moved. Since the outer flange portion 10b of the valve main body portion 10 is at the upper limit portion and abuts on the upper end portion 11b of the cylindrical liner 11, the upward displacement of the cylindrical liner 11 with respect to the valve main body portion 10 is prevented. The liner 11 is prevented from coming off.

This eliminates the need to fix and connect the valve body portion 10 and the cylindrical liner 11 by caulking or press-fitting, so that the valve body portion 10 and the cylindrical liner 11 are fitted to such an extent that large rattling does not occur. It is sufficient if they are in the combined state, and there is no problem such as liquid sealing or detachment of the tubular liner 11 due to a decrease in the retaining load due to creep.

When power is supplied to the electromagnetic coil portion 28 of the electromagnetic coil device 20, the plunger 23 is attracted to the suction element 21 against the spring force of the spring 18, as shown in FIG. Accordingly, the pilot valve 17 is lowered, and the pilot valve 17 is seated on the pilot valve seat 16 to close the pilot passage 14. Further, the main valve body 9 is pushed down against the spring force of the valve spring 12, the main valve body 9 is seated on the valve seat 6, the valve port 5 is closed, and the valve is brought into a closed state.

At this time, the valve rear chamber 1 is moved from the throttle passage 15 formed by the gap between the guide sleeve member 7 and the cylindrical liner 11.
The primary pressure is applied to 3 and a pressure difference occurs before and after the main valve body 9, and a force in the valve closing direction acts on the main valve body 9 due to the pressure difference, and the valve closing force increases.

In the above-mentioned closed state, the main valve body 9 abuts on the valve seat 6 with the valve body 10 made of synthetic resin.
The sealing performance of the valve port 5 is improved, excellent valve closing performance is obtained, and no metal collision noise is generated when the valve is closed.

The opening and closing movement of the main valve body 9 is performed in a contact relationship between the metal tubular liner 11 and the same kind of metal as the guide sleeve member 7 on the valve housing 1 side. Therefore, the valve housing 1 is made of light metal. However, wear of the sliding surface of the liner does not increase, and corrosion of different metals (electrolytic corrosion)
Does not occur, and the durability of the valve housing 1 is improved.

Further, since the pilot valve 17 is formed of a non-magnetic material as a separate component from the plunger 23 of the electromagnetic coil device 20, the magnetic flux generated by the electromagnetic coil device 20 is not transmitted to the pilot valve 17, and Is the conical opposing end 23a of the plunger 23 and the suction element 21
Through the conical plunger suction portion 21b. Thereby, the loss of the magnetic attraction force is reduced, and the power consumption of the coil is reduced.

(At the time of energization interruption) By the interruption of energization, the suction force between plunger 23 and suction element 21 is lost, and the spring force of spring 18 raises pilot valve 17 and plunger 23, causing plunger 23 to move through stopper ring 31. The plug member 25 and comes into contact with the plug member 25, and is in a non-energized state.

When the pilot passage 14 is open, the valve rear chamber 13 is substantially in the same pressure state as the valve chamber 4, and the pressure difference between the front and rear of the main valve body 9 is substantially eliminated or the inlet valve is closed. Outlet port 3 from port 2 through valve port 5
The internal pressure of the valve rear chamber 13 becomes lower than the internal pressure of the valve chamber 4 due to the flow of the fluid flowing to the valve chamber 4 (when the flow rate is large). The main valve element 9 is located at the valve position and is maintained at the valve open position by these forces.

[0042]

As will be understood from the above description, according to the valve device according to the first aspect of the present invention, the valve body contacts the valve seat with the valve body portion made of synthetic resin, and the valve body portion Since the metallic cylindrical liner mounted on the outer peripheral portion of the valve housing is displaced in the valve axial direction with respect to the valve housing due to the same metal in contact with the guide sleeve member on the valve housing side, excellent valve closing performance is obtained. Even when the valve housing is made of a light metal, the wear of the sliding surface of the liner does not increase and corrosion of different metals (electrolytic corrosion) does not occur, so that the durability of the valve housing is improved.

According to the valve device according to the second aspect of the present invention, since the pilot valve is formed of a non-magnetic material as a separate component from the plunger of the electromagnetic coil device, the magnetic flux generated by the electromagnetic coil device is reduced. The power is not transmitted to the pilot valve, the loss of the magnetic attraction force is reduced, and the power consumption of the coil is reduced.

According to the third aspect of the present invention, when the coil is not energized, the pilot valve is located at the position where the pilot passage opens, so that the pressure difference between the front and rear of the valve body is substantially eliminated, and the valve spring When the coil is energized, the pilot valve is located at the position where the pilot passage closes, so that the valve is closed by the pressure difference between the front and rear of the valve. Since the valve device is located at the valve closing position against the spring force of the valve spring, the valve device having the above-described effect can be obtained as the energized-closing pilot-type solenoid on-off valve.

In the valve device according to the fourth aspect of the present invention,
The cylindrical liner is urged in the valve opening direction by the spring force of the valve spring, and the displacement of the valve body in the valve opening direction is regulated by the valve body contacting the fixed side member on the valve housing side. Since the cylindrical liner is prevented from being pulled out by the outer flange provided at the end on the side of the fixed side member, there is no need to fix and connect the valve body portion and the cylindrical liner by caulking or press fitting, etc. It is sufficient that the main body and the cylindrical liner are in a fitted state that does not cause large backlash, which causes problems such as liquid sealing and detachment of the cylindrical liner due to reduction of the retaining load due to creep. There is no.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a valve device according to the present invention in a valve open state.

FIG. 2 is a sectional view showing one embodiment of the valve device according to the present invention in a valve closed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve housing 2 Inlet port 3 Outlet port 4 Valve room 5 Valve port 6 Valve seat part 7 Guide sleeve member 9 Main valve body 10 Valve body part 11 Cylindrical liner 12 Valve spring 13 Valve rear chamber 14 Pilot passage 15 Restriction passage 17 Pilot Valve 18 Spring 20 Electromagnetic coil device 21 Suction piece 23 Plunger 28 Electromagnetic coil section

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H051 AA01 BB06 CC11 DD01 DD09 3H106 DA07 DA12 DA23 DB02 DB12 DB22 DB32 DC03 DC17 DD03 EE22 EE48 GB01 GB05 GB06 GB08 GB11 GB18 KK23

Claims (4)

[Claims] 1. A valve in which a valve housing is made of a light metal such as aluminum and a piston-shaped valve body is displaced in a valve axial direction with respect to the valve housing so that the valve body is formed in the valve housing. In a valve device which is separated from and attached to a seat and opens and closes a valve port defined by the valve seat, the valve body is formed of a synthetic resin at a valve body portion abutting on the valve seat, and a metal cylinder is provided on an outer peripheral portion. A metallic guide sleeve member of the same kind as the tubular liner is fixed to the valve housing, and the valve body is slidable in the guide shaft member in the guide sleeve member with the tubular liner. A valve device characterized in that the valve device is fitted to the valve device. 2. The valve body has a pilot passage in the valve body portion, and the pilot passage is opened and closed by a pilot valve driven by an electromagnetic coil device, and the front and rear of the valve body caused by the opening and closing of the pilot passage are provided. The valve body is a pilot-type solenoid on-off valve that is displaced in a valve axial direction with respect to the valve housing by a valve opening / closing force due to a pressure difference and a spring force of a valve spring, and opens and closes the valve port. 2. The valve device according to claim 1, wherein the valve device is formed of a nonmagnetic material as a separate component from the plunger of the electromagnetic coil device. 3. 3. The valve body has a pilot passage in the valve body, and the pilot passage is opened and closed by a pilot valve driven by an electromagnetic coil device. A pilot opening / closing valve for displacing the valve body in the valve axial direction with respect to the valve housing by a valve opening / closing force due to a pressure difference of the valve spring and a spring force of a valve spring to open and close the valve port; When power is not supplied to the non-energized power supply, the pilot valve is located at a position where the pilot passage opens, and the pressure difference between the front and rear of the valve element is substantially eliminated,
The valve body is located at a valve opening position by the spring force of the valve spring, and when energizing the electromagnetic coil device,
The energizing closing valve in which the pilot valve is located at a position where the pilot passage is closed, and the valve element is located at a valve closing position against a spring force of the valve spring by a valve closing force due to a pressure difference between the front and rear of the valve element. 3. The valve device according to claim 1, wherein the valve device is a pilot-type solenoid on-off valve. 4. The valve spring is provided between the tubular liner and the valve housing, and when the valve body is displaced in the valve opening direction, the valve body portion comes into contact with a fixed member on the valve housing side. The valve device according to claim 3, wherein the valve body has an outer flange portion for preventing a liner from being removed at an end of the valve body portion on the fixed-side member side. 5.