JPH1172178A - Rotary passage directional control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability, and also improve operational performance of a main valve element by avoiding abnormal abrasion of a pilot valve and the main valve element in a rotary passage directional control valve to separate the main valve element from a valve seat plate at the passage switching time by arranging the pilot valve. SOLUTION: In a rotary passage directional control valve having a pilot valve 9, a guide part 4 is arranged in a main valve element 3, and when the main valve element 3 is moved in the rotary shaft direction, a side part of the guide part 4 is slidingly moved in the rotary shaft direction of the main valve element 3 on a peripheral directional part among an inner peripheral surface of a main valve element guiding cylinder part 6 where the guide part 4 is formed in a valve housing 1, and an inclination and eccentricity of the main valve element 3 to the valve housing 1 are restrained, and rubbing of the pilot valve 9, the valve housing 1 to guide this pilot valve 9 and the main valve element 3 is prevented, and a taper is also performed on a tip part outer periphery of the guide part 4 of the main valve element 3, and when the valve element 3 is moved in rotary shaft direction, a tip edge part of the guide part 4 is prevented from striking on a round part of the main valve element guiding cylinder part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type flow switching valve, and more particularly to a four-way or three-way valve with a pilot valve used in a heat pump system.

[0002]

2. Description of the Related Art As a rotary flow passage switching valve used as a four-way valve or a three-way valve, a cylindrical valve housing, and a main valve provided in the valve housing so as to be rotationally displaceable and movable in the direction of the rotational axis. A low pressure side port fixed to the valve housing and connected to a low pressure side pipe, a high pressure side port connected to a high pressure side pipe, and a valve seat plate having at least one switching port; and A pressure chamber defined on one end face side for introducing the pressure of the high pressure side port and a pilot valve for selectively connecting the low pressure side port, and a drive for rotating the main valve body and opening and closing the pilot valve The main valve body is in contact with the valve seat plate at the end face opposite to the pressure chamber, and the switching port is turned by the rotational displacement into the low-pressure side port and the high-pressure side. Poe Selectively rotary channel selector valve with configured pilot valve to connect communication are known to one of.

In the above-described rotary type flow path switching valve, a valve port which is opened / closed by a pilot valve and communicates / blocks a pressure chamber with a low pressure side port is provided in a main valve body, and the pilot valve is a valve housing. A valve housing hole formed in the pilot valve guide portion formed in the main valve body and the main valve body is movably fitted in the axial direction, separately from both the valve housing having the electromagnetic solenoid and the main valve body having the valve port. It is supported and has a built-in pilot valve.

In this rotary type flow switching valve, in a steady state, the main valve body is pressed against the valve seat plate by introducing the pressure of the high pressure side port into the pressure chamber, and the airtightness between the ports is maintained. When switching the flow path, the pilot valve is opened prior to the rotational displacement of the main valve body, and the pressure chamber and the low pressure side port are connected and communicated to release the high pressure state of the pressure chamber, and the pressure difference between the pressure chamber and the high pressure side port is released. The main valve body is lifted from the valve seat plate, and the main valve body can be rotationally displaced with low resistance.

[0005]

In a conventional rotary type flow switching valve, a pilot valve is individually supported by both a valve housing and a main valve body. Since the high pressure side port and the low pressure side port are arranged at a position radially displaced from the rotation center of the main valve, when the main valve body is in a floating state, it is tilted and biased by the inflow pressure on the high pressure side, and this is As a cause, rubbing occurs between the valve housing and the pilot valve or between the main valve body and the pilot valve.

As a result, the movement of the main valve body in the direction of the rotation axis and the opening / closing operation of the pilot valve become unstable, and abnormal wear occurs on the main valve body and the pilot valve, thereby impairing their durability. Will be.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the valve housing, the main valve body, and the pilot valve from being rubbed, and to prevent the main valve body from rubbing. Rotary flow that can move in the direction of the rotating shaft and open and close the pilot valve reliably, without causing abnormal wear on the main valve body and pilot valve, and improving relative dimensional accuracy of each part. An object of the present invention is to provide a path switching valve.

[0008]

In order to achieve the above object, a rotary flow switching valve according to the first aspect of the present invention comprises a cylindrical valve housing, and a rotatable displacement of the valve housing. A main valve body movably provided in the rotation axis direction, a low-pressure port fixed to the valve housing and connected to a low-pressure pipe, a high-pressure port connected to a high-pressure pipe, and at least one switching port And a pilot valve defined on one end face side of the main valve body and selectively communicating and connecting the pressure chamber into which the pressure of the high pressure side port is introduced and the low pressure side port, and the main valve An electromagnetic solenoid for driving the body to rotate and for opening and closing the pilot valve, wherein the main valve body contacts the valve seat plate at an end surface opposite to the pressure chamber, and is rotated by the rotational displacement. The switching port In a rotary flow path switching valve configured to be selectively connected to one of the low pressure side port and the high pressure side port, the valve housing enables the pilot valve to move in the rotation axis direction. A pilot valve guide cylinder portion to be supported, and a main valve body guide cylinder portion that is arranged so as to be shifted from the pilot valve guide cylinder portion in the direction of the rotation axis, wherein the main valve body includes the pilot valve. A guide portion projecting from the one end face located on the side in the direction of the rotation axis and having a side portion abutting on a part of the inner circumferential surface of the main valve body guide cylindrical portion in a circumferential direction, When the main valve body moves in the direction of the rotation axis, the guide portion abutting on the inner peripheral surface of the main valve body guide cylinder slides on the inner peripheral surface in the direction of the rotational axis. It is.

In the rotary type flow path switching valve according to the second aspect of the present invention, a chamfered portion is provided on an outer peripheral edge of a distal end portion of the guide portion.

According to a third aspect of the present invention, in the rotary flow path switching valve, the valve housing has a cylindrical portion for receiving the main valve body, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion. It is integrally formed by drawing.

According to a fourth aspect of the present invention, in the rotary flow path switching valve, the valve seat plate has two switching ports of a first switching port and a second switching port as switching ports, and the main valve body is A first rotational position for communicating and connecting the low-pressure side port and the first switching port and for communicating and connecting the high-pressure side port and the second switching port, and the low-pressure side port and the second A four-way valve that is provided so as to be rotationally displaced between a high-pressure side port and a second rotational position that communicates and connects the first switching port with the switching port, and is used in a heat pump system. There is something.

According to the rotary type flow switching valve according to the first aspect of the present invention, when the main valve body moves in the rotation axis direction, the side of the guide portion provided on the main valve body has a valve housing. By sliding in the rotation axis direction on a part of the inner peripheral surface of the main valve body guide cylindrical portion in the circumferential direction, the main valve body is prevented from being inclined and deviated with respect to the valve housing, and the inclination of the main valve body is restricted. Accordingly, the main valve body and the pilot valve, and the valve housing and the pilot valve do not rub each other.

According to the rotary type flow path switching valve according to the second aspect of the present invention, the outer peripheral edge of the guide portion is provided with the chamfered portion at the outer peripheral edge of the guide portion, so that the outer peripheral edge of the guide portion has the main valve. The inner peripheral surface of the main valve body guide cylinder does not hit the inner peripheral surface of the body guide cylinder, so that the inner peripheral surface of the main valve body guide cylinder does not scrape the outer peripheral edge of the leading end of the guide portion, and Since the outer peripheral edge of the distal end portion of the guide portion does not contact the inner peripheral surface of the main valve body guide cylindrical portion, the outer peripheral edge of the distal end portion of the guide portion comes into contact with the inner peripheral surface of the main valve body guide cylindrical portion without providing a chamfered portion. The frictional resistance that the guide portion receives from the inner peripheral surface of the main valve body guide cylindrical portion when the main valve body moves in the rotation axis direction is reduced as compared with the case where the main valve body is moved in the configuration.

According to the rotary type flow switching valve according to the third aspect of the present invention, the cylindrical portion in which the valve housing receives the main valve body, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion are press deep drawn. These are formed as one piece, and they are composed of one part.The relative dimensional accuracy of these, such as the concentricity of the cylindrical portion that receives the main valve body by pilot deep drawing, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion. In addition, since the cylindrical portion, the pilot valve guide tube portion, and the main valve body guide tube portion are formed as one part, the number of processing and assembly steps and the number of parts are greatly reduced.

According to the rotary type flow path switching valve according to the invention, the valve seat plate has two switching ports of the first switching port and the second switching port as switching ports, and the main valve A first rotational position at which the body communicates with the low-pressure side port and the first switching port and communicates with the high-pressure side port and the second switching port; and The rotary switching passage valve is connected to the second switching port and is rotationally displaced between a high-pressure side port and a second rotating position for communicating and connecting the first switching port. Becomes a four-way valve used in.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 8 show an embodiment of a rotary type flow switching valve according to the present invention. The rotary flow path switching valve is fixed to a cylindrical valve housing 1, a main valve body 3 provided in the valve housing 1 so as to be rotationally displaceable and movable in the rotation axis direction, and to a bottom portion of the valve housing 1. A valve seat plate 5, a pilot valve 9 provided on the main valve body 3, and an electromagnetic solenoid 11 mounted on the upper part of the valve housing 1.
And

As shown in FIGS. 5 and 6, the rotary type flow path switching valve is configured as a four-way valve 100 used in a heat pump system. A low-pressure side port 15 to which a low-pressure side pipe 13 from the suction side is connected;
A high-pressure port 19 to which a high-pressure pipe 17 from the discharge side of the compressor P is connected, and a first switching port 23 to which a pipe 21 of an evaporator (indoor heat exchanger) E is connected.
And a second switching port 27 to which a pipe 25 of a condenser (outdoor heat exchanger) C is connected at a position radially offset from the center of the valve seat plate 5.

The main valve body 3, as shown in FIG.
The guide pin 4 (see FIG. 7), which is fitted to a center pin 31 fixed to the valve seat plate 5 through a center guide hole 29 provided at the bottom and protrudes in a tongue shape at the top, The main valve body guide tube portion 6 provided concentrically with the large-diameter cylindrical portion 2 at the upper portion of the valve housing 1 is movably fitted in the axial direction. Rotationally displaced between the first rotational position and the second rotational position, and linearly displaced vertically between the ascending position and the descending position in the axial direction.

The guide portion 4 is formed on the side opposite to the side of the high-pressure side communication groove 37, which will be described later. Is suppressed.

In the lowered position, the main valve body 3 is in contact with the valve seat plate 5 at the bottom surface (the end surface opposite to the pressure chamber 41) 33, and is shifted radially from the center of the bottom surface portion. The low-pressure side communication groove 35 and the high-pressure side communication groove 3 independent of each other
7 are provided.

In the first rotation position, the main valve body 3 connects the low-pressure side port 15 and the first switching port 23 through the low-pressure side communication groove 35 as shown in FIG. The high pressure side port 19 and the second switching port 27 are communicatively connected by the side communication groove 37, and in the second rotation position,
As shown in FIG. 6, the low pressure side communication groove 35 connects the low pressure side port 15 and the second switching port 27 to each other, and the high pressure side communication groove 37 connects the high pressure side port 19 and the first switching port 23. And are connected.

Thus, in the switching state where the main valve body 3 is in the first rotational position, as shown in FIG. 5, the compressor P → the four-way valve 100 → the condenser C → the throttle D → the evaporator E → the four-way valve. The refrigerant circulation path 100 → compressor P is established, and the heat pump system enters the cooling mode.

On the other hand, in the switching state in which the main valve body 3 is in the second rotation position, as shown in FIG. 6, the compressor P → the four-way valve 100 → the evaporator E → the throttle D → the condenser C → the four-way The refrigerant circulation path from the valve 100 to the compressor P is established, and the heat pump system enters the heating mode.

The tip of the high-pressure side pipe 17 penetrates through the high-pressure side port 19 and protrudes into the high-pressure side communication groove 37. The main valve body 3 is brought into contact with the inner wall surface of the high-pressure side communication groove 37. The stopper also serves as a stopper that limits the range of rotational displacement of the first rotational position to the range of reciprocal rotational movement between the first rotational position and the second rotational position.

On the upper side (one end face side) of the main valve body 3, as shown in FIG. 1, a valve housing 1 and a pilot valve guide cylinder 3 formed on the upper part of the valve housing 1.
9 and the pilot valve 9 fitted to the pressure chamber 41.
Is defined. The pressure chamber 41 is provided with a bypass gap 43 between the pilot valve 9 and the main valve body 3 and a connection between both ends of a substantially C-shaped piston ring 47 fitted in a piston ring groove 45 of the main valve body 3. It communicates with the high-pressure side communication groove 37 and the high-pressure side port 19 through the passage gap (not shown), and the pressure of the high-pressure side port 19 is introduced.

The pilot valve guide cylinder 39 is a large-diameter cylinder 2
The main valve body guide cylinder 6 is provided concentrically with the main valve body guide cylinder 6.
Also, it is fitted in a valve holding hole 51 having a circular cross section formed in the center portion of the main valve body 3 so as to be movable in the axial direction, and is formed in the main valve body 3 by a needle valve portion 53 at the distal end. Valve port 5
Open and close 5.

With this structure, the pilot valve 9 is fitted movably in the axial direction to the pilot valve guide cylinder portion 39 on the valve housing 1 side and the valve holding hole 51 on the main valve body 3 side. It will be supported individually from both of the valve bodies 3.

As a specific shape of the stem portion 10, for example, as shown in FIGS. 8 (a) to 8 (c), the stem portion 10 has a cut surface 12 on its outer peripheral surface and has a D-shaped cross section. It has a surface shape or a polygonal cross-sectional shape, and the pilot valve guide cylinder 39 and the valve holding hole 5 are formed only by the remaining circumferential surface 14.
One that fits in 1 is conceivable.

In this case, the pressure chamber 41 and the valve port 5 are provided between the cut surface 12 of the pilot valve 9 and the valve holding hole 51.
5 is formed.

As another specific shape of the stem portion 10, as shown in FIG. 8D, an outer diameter corresponding to the inner diameter of the pilot valve guide cylinder portion 39 and the inner diameter of the valve holding hole 51 is provided. It may have a substantially cylindrical shape, and may fit into the pilot valve guide cylinder 39 or the valve holding hole 51 over the entire circumference of the circumferential surface 14.

In this case, as shown in FIG. 8E, a small-diameter portion 10a is formed at the tip of the stem portion 10 near the needle valve portion 53, and the small-diameter portion 10a is formed with the small-diameter portion 10a. A through passage 10b passing through the center is provided in the radial direction of the stem portion 10, and a communication passage extending from an end face located on the pilot valve guide cylinder portion 39 side opposite to the needle valve portion 53 to the center of the through passage 10b. 10c is stem part 1
The space formed between the through-passage 10b and the communication passage 10c and the space between the small-diameter portion 10a and the valve holding hole 51 form a passage that communicates the pressure chamber 41 with the valve port 55. .

The valve port 55 is located at the center of the bottom of the valve holding hole 51, and communicates with the pressure chamber 41 via the bypass gap 43 on the one hand, and communicates with the low pressure side communication groove 35 via the communication hole 57 on the other hand.

In the valve housing 1, the large diameter cylindrical portion 2, which is the cylindrical portion for receiving the main valve body, the main valve body guide cylinder 6, and the pilot valve guide cylinder 39 are integrally formed by press deep drawing concentrically with each other. Have been.

The pilot valve 9 is urged in the valve closing direction by a spring 61 provided between the pilot valve 9 and the fixed suction element 59, and the electromagnetic coil 63 of the electromagnetic solenoid 11 is energized to reduce the spring force of the spring 61. In contrast, the suction is attracted to the fixed suction element 59, and the valve port 55 is opened, that is, the valve is opened.

On the upper part of the main valve body 3, a multi-pole magnet 71 made of a plastic magnet is integrally provided by insert molding. The multi-pole magnet 71 has a ring shape concentric with the main valve body 3,
It has two pole portions and two S pole portions alternately.

The electromagnetic solenoid 11 has an electromagnetic coil 63
A staple-shaped main magnetic pole member 65 magnetically connected to one of the upper magnetic poles is fixed by a bolt 67, and is magnetically connected to the other magnetic pole below the electromagnetic coil 63 to form a main magnetic pole member. A staple-shaped auxiliary magnetic pole member 69 is fixed to the magnetic pole member 65 at a position rotated and displaced by 90 degrees around the central axis of the valve housing 1.

In the above-described electromagnetic actuator structure using the electromagnetic solenoid 11 and the multi-pole magnet 71, the main magnetic pole member 65 is magnetized to the N pole and the sub magnetic pole member 69 is magnetized to the S pole depending on the direction of the current flowing through the electromagnetic solenoid 11. Alternatively, it is magnetized to the opposite polarity, and the magnetic action with the multipolar magnet 71 causes the main valve body 3 to be rotationally displaced from the first rotational position to the second rotational position or vice versa.

In the four-way valve 100 having the above-described configuration, when the electromagnetic coil 63 of the electromagnetic solenoid 11 is energized in the state shown in FIG. 9 is displaced upward against the spring force of the spring 61 and is attracted to the fixed suction element 59, so that the valve port 55 is opened.

Thus, the pressure chamber 41 is connected to the low-pressure side communication groove 3.
5. The internal pressure of the pressure chamber 41 decreases from the same high pressure as the high pressure side port 19 to the same low pressure as the low pressure side port 15 by communicating with the low pressure side port 15 and the suction pressure of the compressor P. As a result, the pressure on the upper side of the main valve body 3 becomes lower than that on the lower side of the main valve body 3, and the pressure difference causes the main valve body 3 to be displaced upward and away from the valve seat plate 5 to guide the main valve body of the valve housing 1. The side part of the guide part 4 slides upward while contacting the cylinder part 6. The elevation of the main valve body 3 is restricted by the valve port 55 being in contact with and closing the needle valve portion 53, whereby the main valve body 3 is closed.
The upper and lower pressures are balanced, so that the main valve body 3 can be rotationally displaced with low resistance.

When the pilot valve 9 is opened, the internal pressure of the pressure chamber 41 decreases because of the communication gap between the piston ring 47 and the communication between the pressure chamber 41 and the high-pressure side communication groove 37 and the high-pressure side port 19. This is because the communication degree is set to a value lower than the communication degree between the pressure chamber 41 and the low-pressure side communication groove 35 when the pilot valve 9 is opened.

In the above state, the main valve body 3 is rotationally displaced from the first rotational position to the second rotational position by the magnetic action of the magnetic poles of the main magnetic pole member 65 and the sub magnetic pole member 69 and the multipolar magnet 71. , Or vice versa, and the heat pump cycle is switched to the cooling mode or the heating mode.

Thereafter, when the energization of the electromagnetic coil 63 is stopped, the pilot valve 9 is lowered and closed by the spring force of the spring 61, and the communication between the pressure chamber 41 and the low-pressure side communication groove 35 is cut off. Gap 43 and piston ring 4
7, the pressure in the high-pressure side communication groove 37 and the pressure in the high-pressure side port 19 are introduced into the pressure chamber 41, and the pressure chamber 41 becomes the same pressure as the lower pressure of the main valve body 3, and the spring 61 The main valve body 3 returns to its original lowered position due to the force and the weight of the main valve body 3 and comes into close contact with the valve seat plate 5.

In the above-described operation, the high pressure is applied to the high pressure side communication groove 37 at a position radially displaced from the center of the main valve body 3 due to the fitting relationship between the guide portion 4 and the main valve body guide cylinder portion 6. Of the main valve body 3 due to the inflow pressure on the side is suppressed, so that the valve holding hole 51 of the main valve body 3, the pilot valve 9, and
The pilot valve guide cylinder 39 and the pilot valve 9 of the valve housing 1 do not rub each other.

Therefore, the raising / lowering operation of the main valve body 3 and the opening / closing operation of the pilot valve 9 do not become unstable, and the raising / lowering operation of the main valve body 3 and the opening / closing operation of the pilot valve 9 become more reliable. The occurrence of abnormal wear on the outer circumference of the pilot valve 3 and the pilot valve 9 is also avoided, and the durability is improved.

In the valve housing 1, the large-diameter cylindrical portion 2, which is a cylindrical portion for receiving the main valve body 3, the main valve body guide cylindrical portion 6, and the pilot valve guide cylindrical portion 39, are integrally formed concentrically by press deep drawing. Because it is molded, the number of parts can be reduced,
The relative dimensional accuracy of each part is improved, and the stability and reliability of the valve operation are improved.

FIG. 9 shows another embodiment of the rotary flow path switching valve according to the present invention. In FIG. 9, components that are the same as or the same as those shown in FIG. 1 are given the same reference numerals as those shown in FIG. 1, and descriptions thereof are omitted.

In this embodiment, a relatively large taper 4a (corresponding to a chamfered portion) as shown in a perspective view in FIG. Have been.

As shown in FIG. 9, the outer peripheral edge of the guide portion 4 has a taper 4a, so that the distal end portion of the guide portion 4 has an inner peripheral surface of the main valve body guide cylindrical portion 6, in particular, as shown in FIG. The rounded portion 6a of the main valve body guide cylindrical portion 6 does not come into contact with the convex rounded portion 6a inside the valve housing 6 at the entrance of the main valve body guide cylindrical portion 6, and when the main valve body 3 moves in the rotation axis direction. It can be avoided that the outer peripheral edge of the distal end portion of the guide portion 4 is shaved by the inner peripheral surface including.

Thus, the degree of occurrence of scratch damage on the outer peripheral edge of the distal end portion of the guide portion 4 even after long-term use is reduced, and the durability is improved.

Further, resin powder due to scratching of the guide portion 4 is not generated in the valve chamber, and occurrence of operation failure due to biting of the resin powder is prevented.

The shape of the outer peripheral edge of the leading end of the guide portion 4 is as follows.
The shape of the outer peripheral edge is not limited to the taper 4a but may be reduced by a relatively large radius.
When the main valve body 3 moves in the rotation axis direction, the inner peripheral surface including the round portion 6a of the main valve body guide cylindrical portion 6 prevents the leading edge of the guide portion 4 from being cut off when the main valve body 3 moves in the rotation axis direction. You.

Although the present embodiment has been described by taking a four-way valve as an example, it goes without saying that the present invention is similarly applicable to a rotary three-way valve.

[0054]

As will be understood from the above description, according to the rotary flow path switching valve according to the first aspect of the present invention,
A cylindrical valve housing, a main valve body rotatably displaceable in the valve housing and movable in the rotation axis direction, a low pressure side port fixed to the valve housing and connected to a low pressure side pipe, a high pressure side A high pressure side port to which a pipe is connected, a valve seat plate having at least one switching port, a pressure chamber defined on one end face side of the main valve body to introduce the pressure of the high pressure side port, and the low pressure A pilot valve that selectively connects and connects the side ports, and an electromagnetic solenoid that rotationally drives the main valve body and opens and closes the pilot valve, wherein the main valve body is opposite to the pressure chamber. A rotary flow path switch configured to contact the valve seat plate at an end surface on the side thereof and selectively connect the switching port to one of the low-pressure port and the high-pressure port by rotational displacement. In the above, the valve housing includes a pilot valve guide cylinder portion that supports the pilot valve so as to be movable in the rotation axis direction, and a main valve body that is displaced from the pilot valve guide cylinder portion in the rotation axis direction. The main valve body is provided so as to protrude in the direction of the rotation axis from one end face located on the pilot valve side, and is formed of an inner peripheral surface of the main valve body guide cylinder portion. It has a guide part whose side part abuts on a part of the circumferential direction, and when the main valve body moves in the rotation axis direction, it comes into contact with the inner peripheral surface of the main valve body guide cylindrical part. The guide portion slides on the inner peripheral surface in the rotation axis direction.

For this reason, when the main valve element moves in the direction of the rotation axis, the side of the guide portion provided on the main valve element is connected to the inner peripheral surface of the main valve element guide cylinder portion of the valve housing in the circumferential direction. Of the main housing and the pilot valve, and the main housing and the pilot valve, and the valve housing and the pilot by controlling the inclination of the main valve body. The valves do not each rub.

According to the rotary type flow path switching valve according to the second aspect of the present invention, the guide portion is provided with a chamfered portion on the outer peripheral edge of the distal end portion.

For this reason, the outer periphery of the leading end of the guide portion is chamfered, and the outer periphery of the leading end of the guide portion is provided with a chamfered portion. The inner peripheral surface of the body guide tube does not hit the inner peripheral surface of the main valve body.
As a result, the durability of the guide portion can be improved, and the outer peripheral edge of the leading end portion of the guide portion is scratched by hitting the inner peripheral surface of the main valve body guide tube portion, thereby causing resin powder to enter the valve chamber. This does not occur, and the occurrence of operation failure of the main valve body due to the biting of the resin powder is prevented beforehand.

Further, since the outer peripheral edge of the distal end portion of the guide portion does not contact the inner peripheral surface of the main valve body guide cylindrical portion, the outer peripheral edge of the distal end portion of the guide portion does not have a chamfered portion. Since the frictional resistance that the guide portion receives from the inner peripheral surface of the main valve body guide cylinder portion during the movement of the main valve body in the rotation axis direction is reduced as compared with the case where the inner peripheral surface is hit, the operation of the main valve body Performance can be improved.

According to the rotary type flow switching valve according to the third aspect of the present invention, the valve housing includes a cylindrical portion for receiving the main valve body, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion. It was assumed that it was integrally formed by press deep drawing.

For this reason, the cylindrical portion in which the valve housing receives the main valve body, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion are integrally formed by press deep drawing, and these are formed as one part. The relative dimensional accuracy of the cylindrical portion for receiving the main valve body, the pilot valve guide cylindrical portion, and the concentricity of the main valve body guide cylindrical portion is improved by deep drawing, and the cylindrical portion and the pilot valve guide cylindrical portion are further improved. Since the main valve body guide cylinder is formed of one part, the number of processing and assembly steps and the number of parts are significantly reduced.

According to the rotary flow path switching valve of the fourth aspect, the valve seat plate has two switching ports of a first switching port and a second switching port as switching ports, and the main valve The body is configured to communicate and connect the low-pressure port and the first switching port and to communicate and connect the high-pressure port and the second switching port; and The two switching ports are connected so as to be rotationally displaced between a high-pressure side port and a second rotational position that connects the first switching port. It was configured as a valve.

For this reason, the main valve body has a first rotational position for connecting the low pressure side port and the first switching port in communication and for connecting the high pressure side port and the second switching port in communication. A rotary connection between the low pressure side port and the second switching port, and a rotational displacement between a second rotation position for communicating the high pressure side port and the first switching port. The flow path switching valve becomes a four-way valve used in the heat pump system, and in the four-way valve, the movement of the main valve body in the rotation axis direction is ensured, and the main valve body is kinked with respect to the valve housing. Therefore, even when the pilot valve is supported by the main valve body so as to be movable in the rotation axis direction, the opening and closing operation of the pilot valve is ensured, and abnormal wear occurs on the pilot valve. Both are avoided, the effect of such improved durability can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a rotary flow path switching valve according to the present invention.

FIG. 2 is a plan view of the rotary flow path switching valve of FIG. 1;

FIG. 3 is a bottom view of the rotary flow path switching valve of FIG. 1;

FIG. 4 is a side view of the rotary flow path switching valve of FIG. 1;

5 is an explanatory diagram showing a refrigerant circuit configuration during a cooling operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system.

FIG. 6 is an explanatory diagram showing a refrigerant circuit configuration during a heating operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system.

FIG. 7 is a perspective view of the main valve body of FIG. 1;

8 (a) to 8 (d) are end views of the pilot valve of FIG. 1, and FIG. 8 (e) is a sectional view of the pilot valve of FIG.

FIG. 9 is a longitudinal sectional view showing another embodiment of the rotary flow path switching valve according to the present invention.

FIG. 10 is a perspective view of the main valve body of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve housing 2 Large diameter cylindrical part 3 Main valve body 4 Guide part 4a Taper 5 Valve seat plate 6 Main valve body guide cylinder part 6a Round part 9 Pilot valve 11 Electromagnetic solenoid 12 Cut surface 14 Circumference part 15 Low pressure side port 19 High pressure Side port 23 First switching port 27 Second switching port 35 Low pressure side communication groove 37 High pressure side communication groove 41 Pressure chamber 45 Piston ring groove 47 Piston ring 55 Valve port 59 Fixed suction element 63 Electromagnetic coil 65 Main magnetic pole member 69 Secondary Magnetic pole member 71 Multi-pole magnet

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuto Aihara 535 Sasai, Sayama-shi, Saitama Prefecture Inside Sagimiya Works Sayama Works (72) Inventor Kazushige Suzuki 535 Sasai, Sayama-shi Saitama Prefecture Sagami Works Sayama Works In-house (72) Inventor Kazuo Hirata 535 Sasai, Sayama City, Saitama Prefecture Inside the Sayama Plant, Sayama Plant (72) Inventor Toshihiro Teranishi 535 Sasai, Sayama City, Saitama Prefecture Inside the Sayama Plant, Sayama Plant (72) Inventor Mitsuaki Noda 535 Sasai, Sayama-shi, Saitama Prefecture Sagimiya Manufacturing Co., Ltd.Sayama Plant (72) Inventor Michiaki Ohno 535 Sasai, Sayama-shi, Saitama Prefecture Sayama Works, Sayama Plant (72) Inventor Fumio Kanazaki 535 Sasai, Sayama-shi Saitama Prefecture Sagimiya Works Sayama Works

Claims (4)

[Claims] 1. A cylindrical valve housing, a main valve body rotatably displaceable in the valve housing and movable in a rotation axis direction, and a low pressure fixed to the valve housing and connected to a low pressure side pipe. A side port, a high-pressure side port connected to the high-pressure side pipe, and a valve seat plate having at least one switching port; and a pressure of the high-pressure side port defined on one end face side of the main valve body. A pilot valve that selectively connects and connects the pressure chamber and the low-pressure side port; and an electromagnetic solenoid that rotationally drives the main valve body and opens and closes the pilot valve. The switching port is configured to be selectively connected to one of the low-pressure side port and the high-pressure side port by a rotational displacement by contacting the valve seat plate at an end surface opposite to the chamber. B In the tally flow path switching valve, the valve housing is configured to shift the position in the rotation axis direction from the pilot valve guide cylinder portion that supports the pilot valve so as to be movable in the rotation axis direction and the pilot valve guide cylinder portion. A main valve body guide cylinder portion, wherein the main valve body projects from the one end face located on the pilot valve side in the rotation axis direction, and the main valve body guide cylinder portion is provided. A guide portion whose side portion abuts a part of the inner peripheral surface of the main valve body in the circumferential direction, when the main valve body moves in the rotation axis direction, The rotary flow path switching valve, wherein the guide portion abutting on a peripheral surface slides on the inner peripheral surface in the rotation axis direction. 2. The rotary flow path switching valve according to claim 1, wherein a chamfered portion is provided on an outer peripheral edge of a front end portion of the guide portion. 3. The valve housing is characterized in that a cylindrical portion for receiving the main valve body, the pilot valve guide cylindrical portion, and the main valve body guide cylindrical portion are integrally formed by press deep drawing. The rotary flow path switching valve according to claim 1. 4. The valve seat plate has two switching ports, a first switching port and a second switching port, as switching ports, and the main valve body has the low pressure side port and the first switching port. And a first rotational position for communicating and connecting the high pressure side port and the second switching port.
The low-pressure side port and the second switching port are provided so as to be rotationally displaced between a second rotational position communicating and connecting the high-pressure side port and the first switching port while communicating with the second switching port, 4. The rotary flow switching valve according to claim 1, wherein the rotary flow switching valve is a four-way valve used in a heat pump system.