JPH1047511A - Solenoid four-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a valve element, so that piping can be omitted of a pressure introducing pipe connecting a solenoid valve and a four-way valve, by bringing a part of a pilot valve in the four-way valve of the pilot solenoid valve used in the conventional four-way valve. SOLUTION: In a solenoid four-way valve, case 4, a part of a pilot valve of a pilot solenoid valve, conventionally manufactured as a separate unit in a resin-made inner case 4, is formed, also by two sheets of blade-shaped partitioning plates 12, 13 integrally formed with a rotatable valve element 2, a high pressure chamber 27 and two pressure chambers 28, 29 guiding a low or high pressure are formed, and in the inner case 4, a high pressure introducing hole 33, two pressure introducing holes 35, 36 and a low pressure introducing hole 34 for operating a piston by a pressure difference are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic four-way valve (hereinafter simply referred to as "four-way valve") for switching the flow path of refrigerant during cooling and heating in a heat pump type refrigerant circuit.
In particular, the portion of the pilot valve 8 of the solenoid valve B, which has been conventionally mounted via a pipe outside the four-way valve A, is replaced with the four-way valve A.
The present invention relates to an electromagnetic type four-way valve in which the valve body is reduced in size and the piping connecting the electromagnetic valve and the four-way valve can be omitted.

[0002]

2. Description of the Related Art Conventionally, a pilot solenoid valve is not used, that is, a direct-acting type four-way valve is disclosed in Japanese Unexamined Patent Publication No. 3-114681.
No. 1993. This direct acting four-way valve
As shown in FIG. 8, the valve body 111 includes a cylindrical valve body 111 and an electromagnet 112 disposed on the valve body 111. The valve body 111 includes a metal disk-shaped valve seat 113 and an upper surface of the valve seat 113. A valve body 114 made of a plastic magnet having one set (N-pole, S-pole) of magnetic poles rotatably mounted on the shaft, a central shaft 115 rotatably supporting the valve body 114, and a cylindrical shape. 116 and cap 11 made of non-magnetic material
7.

In the electromagnet 112, a coil 119 is wound around an outer periphery of an iron core 118 at the center thereof. When the coil 119 is energized (forward direction ← → reverse direction), the polarity can be changed (N pole). ← → S pole). Also,
The electromagnet 112 has an iron core 118 on the top of the valve body 111.
A magnetic pole plate 120 having an arc-shaped cross section extending outward from the lower end of the iron core 118 along the lower surface of the coil 119 and having its tip bent downward.
A pole plate 121 having a circular cross section extending downward from the upper end portion of the coil 119 along the outer side of the upper end of the coil 119 is provided to face each other. The two magnetic pole plates 12 below the electromagnet 112
At 0 and 121, they are combined so as to sandwich the outer peripheral portion of the valve body 111, and are fixed by a retaining ring 122.

Thus, the pole plates 120, 12 of the electromagnet are
By associating 1 with the magnetic pole of the valve element 114 made of plastic magnet, the valve element 114 rotates 90 ° during the magnetic conversion of the coil 119, and the flow path of the refrigerant in the heat pump refrigeration cycle can be switched.

However, in such a direct-acting type four-way valve, the valve body is operated unless the pressure difference between the pressure above and below the valve body of the four-way valve becomes small because the valve body rotating torque is low. Can not do it. That is, the differential pressure during operation: 10
20 kgf / cm ² , the balance differential pressure after stopping is 0.3
Since the four-way valve does not operate unless it becomes smaller than kgf / cm ^2, the time (waiting time) until the four-way valve can be switched (heating ← → cooling / defrosting) immediately after the compressor of the air conditioner is stopped. However, there has been a problem that the air conditioner operating efficiency (coefficient of performance) becomes low.

Therefore, the differential pressure during operation is 10 kgf / cm
^In a refrigerant circuit of a refrigeration cycle having two refrigerant valves, a four-way valve in which a refrigerant pressure applied to a piston is switched by a pilot valve is still often used. FIG. 6 is a longitudinal sectional view of a conventional four-way valve A and pilot solenoid valve B showing a state during a heating operation in a refrigerant circuit of a refrigeration cycle using the four-way valve. In FIG.
The case 3 of the four-way valve A is a cylindrical tube, and an inlet tube 19 connected to the discharge side (see FIG. 7) of the compressor C is attached to the upper center of the case 3, and the outlet 16 is centered at the bottom. An inverted cave-shaped valve seat 1 provided with through holes 17 and 18 which are divided into right and left is integrally provided. The valve seat 1 is provided with an outlet pipe 20 connected to the outlet 16 and through-hole pipes 21 and 22 connected to the through-holes 17 and 18 in a hanging manner. As shown in FIG. 7, during the cooling operation, the outlet pipe 20 is connected to the return pipe of the compressor C, the through pipe 21 is connected to the outlet pipe of the indoor heat exchanger, and the through pipe 22 is connected to the outlet pipe. The chamber is connected to the inlet-side pipe of the heat exchanger. At both ends of the case 3, a dish-shaped lid 59 provided with pressure introducing holes 34 and 35, respectively,
59 is fixed.

The valve body 2 is formed in a bowl shape so as to straddle an outlet 16 formed in the valve seat 1 and one of left and right through holes 17 and 18. Piston 6
3 and 62 are incorporated in a connecting plate 60 that supports them. A leaf spring 61 is provided between the valve body 2 and the connecting plate 60, so that the valve body 2 does not rotate even if the partition plates 12, 13 try to rotate in the circumferential direction. It can slide right and left close to the upper surface. Note that the pistons 63 and 62 are connected to the left and right lids 59 and 59 and the piston 6.
It operates by the pressure difference of the refrigerant between 3, 62.

The pilot solenoid valve B is fixed to the cylindrical case 3 of the four-way valve A by an appropriate bracket (not shown), and comprises a valve body 40 and an electromagnetic coil 41. The valve body 40 is provided with a pilot valve sliding hole 14 substantially at the center, and one surface of the hole is formed in a plane to form a valve seat 14a so that the pilot valve 8 can slide in the left-right direction. Has become. The high pressure introduction pipe 5 connected to the refrigerant introduction pipe 19 is provided at the valve seat 14a.
1 introduces a high-pressure refrigerant to the pilot valve sliding hole 1
The inside of 4 is always kept at a high pressure. In addition, the valve seat 1
4a is provided with a low-pressure introduction hole 56 and pressure introduction holes 57 and 58 communicating with the low-pressure introduction pipe 52 and the pressure introduction pipes 53 and 54, respectively.

The electromagnetic coil 41 has a plunger 7 slidably inserted in a plunger tube 5 made of a non-magnetic material, and its tip (left portion in the drawing) has a bowl. A pilot valve 8 is mounted. The suction element 6 is fixed to the right part of the plunger tube 5 via a spring 9 by a screw 39. A coil 10 is arranged around the plunger tube 5.

Next, the operation of the conventional four-way valve A will be described with reference to the refrigeration circuit diagram of FIG. The solid line arrows in this figure indicate the state of the heating operation, and the dashed arrows indicate the state of the cooling operation. In the cooling operation, the refrigerant discharged from the compressor C flows into the introduction pipe 19 of the four-way valve A → the through-hole pipe 22 → the outdoor heat exchanger F → the capillary E → the indoor heat exchanger D → the communication hole 21 of the four-way valve A. → It returns to the compressor C via the outlet pipe 20.

[0011]

In the above-described four-way valve A of the type in which the conventional pilot solenoid valve B is externally mounted, the solenoid valve (including the pilot valve 8) is separately provided outside the case 3 of the four-way valve A. As a result, there are the following problems. Low pressure introduction holes 56, pressure introduction holes 57 and 5 of the solenoid valve
8 and the pressure chambers 28, 29 of the four-way valve
Since the airtight assembly is performed by brazing using 2, 53, 54 (copper tube), the number of assembly steps is increased and the cost is increased. The valve seat 1 of the four-way valve is disposed so as to protrude upward at the center of the inner surface of the case 3, has a valve body 2 attached to the center, and has a connecting plate 60 (hereinafter, referred to as left and right) provided with pistons 63 and 62.
The partition plate must be inserted from both ends of the case 3 and assembled, and the assembly is complicated, and the lids 59 and 59 are soldered after the partition plate is assembled, so that there is a problem in airtightness.

[0012]

According to the present invention, a part of a pilot valve 8 of a pilot solenoid valve D which has been conventionally manufactured separately is formed in an inner case 4 of a four-way valve A.
Two vane-shaped partition plates 12 and 13 formed integrally with the rotating valve body 2 are provided, a high-pressure chamber is formed between the partition plates, and two high-pressure refrigerant and low-pressure refrigerant are introduced to the outside of the partition. Forming pressure chambers 28 and 29, and further forming a high pressure introduction hole 33, two pressure introduction holes 35 and 36, and a low pressure introduction hole 34 for operating the partition plates 12 and 13 by a pressure difference in the inner case 4; Thus, the pressure chambers 27 and 28 of the four-way valve A, the pressure inlet pipes 19 and the outlet pipe 20 for the high-pressure refrigerant, and the pressure inlet pipes 51 and
It is an object of the present invention to provide an electromagnetic four-way valve that does not require connection of 52, 53, and 54 (copper tubes).

That is, the electromagnetic four-way valve of the present invention comprises a resin inner case 4 provided integrally with a metal case 3.
A metal valve seat 1 fixed to the lower end of the resin inner case 4, and a valve body 2 mounted on the upper portion of the valve seat 1 and rotating about a central axis 11 as a fulcrum. An electromagnetic four-way valve comprising a valve A and an electromagnetic valve B provided with a pilot valve 8 at the tip of a plunger 7, wherein the structure of the electromagnetic valve B is a plunger tube 5 made of a non-magnetic material.
Plunger 7 slidably inserted therein, and a bowl-shaped pilot valve 8 provided at the tip of plunger 7
And a valve holder 38 for pressing the pilot valve 8.
And the plunger tube 5 via a spring 9
And a coil 10 arranged around the plunger tube 5. The plunger tube 5 of the solenoid valve B is provided on the upper part of the case 3 as a structure of the case 3. Mounting part 3a for mounting
And an opening 3b for hermetically attaching the valve seat 1 at the lower end thereof. The inner case 4 has a structure in which walls 4a and 4
b, a pilot valve sliding hole 14 having one plane for sliding the pilot valve 8 in the vertical direction to form a valve seat 14a, and a high pressure introducing hole 33 communicating with the pilot valve sliding hole 14. And low pressure introducing holes 34 communicating with the outlet pipe 20 through the pressure introducing holes 35 and 36 communicating with the pressure chambers 28 and 29 and the communicating hole 31 of the valve body 2, respectively, and wing-shaped partition plates 12 and 13. The metal valve seat 1 has four openings 15, 16, 17, and 1.
8 are provided on a concentric circle, and an inlet pipe 19, an outlet pipe 20, a through-hole pipe 21, which communicate with the four openings on the lower surface, respectively.
22 and the structure of the valve body 2 is such that at least two of the four openings 15, 16, 17, 18 of the valve seat 1 are air-tightly connected and the remaining openings are opened. And a vane-shaped partition plate 12 and 13 for partitioning and forming a high-pressure chamber 27 and pressure chambers 28 and 29 in airtight sliding contact with the inner surface of the inner case 4. The plunger tube 5 of the solenoid valve B is hermetically attached to the upper attachment portion 3a by brazing, and the valve seat 1 is hermetically attached to the opening 3b of the case 3 by brazing. Things.

[0014]

1 to 5 show an embodiment of the present invention.
This will be described in detail based on FIG. The same parts as those of the conventional product are described using the same reference numerals. As shown in FIG. 1, the electromagnetic four-way valve of the present invention has a pilot valve 8 portion of a pilot solenoid valve which has been conventionally manufactured separately and is formed in an inner case 4 made of resin. A central portion sandwiched between two vane-shaped partition plates 12 and 13 formed integrally with the rotatable valve body 2 is a high-pressure chamber 27, and a low-pressure refrigerant or high-pressure refrigerant is provided outside the partition plates 12 and 13. The pressure chambers 28 and 29 into which the refrigerant is introduced are formed. As shown in FIGS. 2 and 3, a high-pressure introduction hole 33, two pressure introduction holes 35, 36, and a low-pressure introduction hole 34 for operating a partition plate by a pressure difference are formed in the inner case 4. Things.

Next, each component of the present invention will be described in detail. The solenoid valve B includes a plunger 7 slidably inserted vertically into a plunger tube 5 made of a non-magnetic material, a bowl-shaped pilot valve 8 provided at the tip of the plunger 7, Valve retainer 3 for the pilot valve 8
8, a suction element 6 fixed to the upper end of the plunger tube 5 via a spring 9, and a coil 10 arranged around the plunger tube 5. The jar 7 is attracted to the suction element 6, and the plunger 7 is pushed down when the coil is not energized. That is, the pilot valve 8
However, the low-pressure introduction hole 34 and one of the pressure introduction holes 35 and 36 communicate with each other by sliding up and down on the valve seat 14 by the valve retainer 38.

The case 3 is provided at its upper part with a mounting portion 3a for integrally mounting the plunger tube of the solenoid valve B, and has an opening 36 at the lower end of the case.
The opening 36 has a metal valve seat 1 to be described later.
Can be hermetically mounted.

As shown in FIGS. 2 and 3, the inner case 4 made of resin slides the pilot valve 8 in the up and down direction and wall surfaces 4a and 4b for regulating the rotation angle of the valve body 2 to be described later. A pilot valve slide hole 14 having one flat surface for forming the seat 14a is provided.

Further, the pilot valve sliding hole 14 has:
As shown in FIGS. 1 and 2, a high-pressure introduction hole 33 communicating with this, and a low-pressure introduction hole 34 communicating with the outlet pipe 20 through the pressure introduction holes 35 and 36 and the communication hole 31 of the valve body 2 are provided. I have.

FIG. 2A shows the inside of the inner case 4.
As shown in (b), the vane-like partition plates 12, 1 of the valve body 2
The room sandwiched by 3 is defined as a high-pressure chamber 27, and the room between the outside of the partition plates 12, 13 and the wall surfaces 4a, 4b is defined as pressure chambers 28, 29. FIG.
As shown in FIG. 3, a projection 37 is provided at the lower end of the center of the inner case 4, and by attaching the O-ring 14 to the projection, the valve body 2 rotates in an airtight manner with the inner surface of the partition 30. You can do it. Further, high-pressure refrigerant is introduced into the high-pressure chamber 27 through the through hole 23 or the through hole 24 of the valve body 2.

As shown in FIGS. 4 and 5, the resin valve body 2 is provided with through holes 23 and 24 at positions corresponding to an inlet 15 and a through hole 17 of the valve seat 1 to be described later. A communication hole 25 connecting the two through holes 23 and 24 is provided in the lower half. In the valve body 2, at least two of the four openings of the valve seat 1 are airtightly communicated, and the remaining openings are in an open state. An airtight communication hole 26 is provided at a position corresponding to the outlet 16 and the through hole 18 of the valve seat 1 to be described later in an airtight manner.

The communication holes 25 and the airtight communication holes 26 have lower portions formed in the shape of a plane arc, and the openings (inlet 15, outlet 16, through hole 17, and inlet 17) of the adjacent valve seats are formed.
In 18), the communication state is switched. The communication hole 31 is provided for communicating the airtight communication hole 26 with the low-pressure introduction hole 34 of the inner case 2.

Further, on the upper part of the valve body 2 made of resin, there are provided plate-like partition plates 12 and 13 which are in sliding contact with the inner surface of the inner case 4, and the partition plates 12 and 13 and the wall surfaces 4a and 4a are provided.
As described above, the high pressure chamber 27 is formed at the center and the pressure chambers 28 and 29 are formed outside the partition plates 12 and 13 as described above. A partition 30 is provided at the center of the upper part of the valve body 2.
7 can be fitted airtightly.

The metal disk-shaped valve seat 1 is, as shown in FIG.
Four openings are provided concentrically and at equal intervals (90 °), and an opening 15 is provided as an inlet, an opening 16 facing the outlet is provided as an outlet, and openings 17 and 18 arranged orthogonally thereto are provided. It is a through hole, and an introduction pipe 19 is provided at the introduction port 15,
An outlet pipe 20 is provided at the outlet 16 and through-hole pipes 21 and 22 are provided integrally with the through-holes 17 and 18 by brazing.

[0024]

Next, the operation of the electromagnetic four-way valve of the present invention will be described.
The description will be made based on FIGS. 1, 2, 5 and 7 (the system is the same in the present invention and the conventional system). The control of energization of the coil 10 is performed by a controller (not shown) that controls the operating state of the air conditioner.

When the coil 10 is not energized, the plunger 7 is pushed down by the spring 9, and the pilot valve 8 is pushed down as shown in FIG. In this state, the pressure introduction hole 35 and the low pressure introduction hole 34 communicate with each other, and the pressure chamber 29 is in a low pressure state. In addition, since the pressure introduction hole 36 is in an open state, the pressure in the high-pressure chamber 27 communicates with the pressure chamber 28 through the pressure introduction hole 33, so that the pressure chamber 28 is in a high-pressure state. As described above, when the pressure chamber 28 is in the high pressure state and the pressure chamber 29 is in the low pressure state, the partition plate 13 is pushed to the low pressure side due to the pressure difference, that is, the valve body 2 rotates to the left, and as shown in FIG. State. As shown in FIG. 5 (A), the refrigerant conduction path in the valve body 2 allows the introduction port 15 and the through hole 17 of the valve seat 1 to communicate with each other.
As shown in (B), the outlet 16 and the through hole 18 communicate with each other.

Therefore, in the cooling operation, as shown by a chain line in FIG. 7, the refrigerant flowing out of the discharge port of the compressor C passes through the communication hole 25 from the introduction pipe 19 through the introduction port 15, and passes through the communication hole 25, Through the outdoor heat exchanger F → capillary tube E → indoor heat exchanger D
And returns to the compressor C via the through-hole pipe 21, the through-hole 18, the airtight communication hole 26, the outlet 16 and the outlet pipe 20.

Next, when the coil 10 is energized, the plunger 7 is attracted by the suction element 6 against the force of the spring 9 by the action of a magnetic field generated inside, and the pilot valve 8 is pulled upward. In this state, the pressure introduction hole 36 and the low pressure introduction hole 34 communicate with each other, and the pressure chamber 28 is in a low pressure state. Further, since the pressure introduction hole 35 is in an open state, the pressure in the high-pressure chamber 27 communicates with the pressure chamber 29 through the pressure introduction hole 33, so that the pressure chamber 29 is in a high-pressure state. Thus, the pressure chamber 29 is in a high pressure state and the pressure chamber 28
Is in the low pressure state, the partition plate 12 is pushed to the low pressure side due to the pressure difference, that is, the valve body 2 rotates rightward to the state shown in FIG.

Therefore, the inlet 15 and the through hole 18 and the outlet 16 and the through hole 17 of the valve seat 1 shown in FIG. 4B are in communication with each other. To
The refrigerant flowing out of the discharge port of the compressor C passes through the communication hole 25 from the introduction pipe 19 through the introduction port 15, passes through the through-hole pipe 21, passes through the indoor heat exchanger D → capillary tube E → outdoor heat exchanger F, and passes through. It returns to the compressor C via the hole pipe 22, the through hole 17, the airtight communication hole 26, the outlet 16 and the outlet pipe 20.

[0024]

As described above, according to the present invention, the pilot valve portion of the pilot solenoid valve which has been conventionally manufactured separately is formed in the inner case 4 made of resin and is integrated with the rotatable valve body 2. Two blade-shaped partition plates 12 and 13 formed
A high pressure chamber 27 and two pressure chambers 28 and 29 are formed by this, and by energizing the coil, the pilot valve 8 at the tip of the plunger 7 is slid to change the state of introduction of pressure into the pressure chambers 28 and 29. Since the structure is such that the connection of the introduction pipe 19 is switched by rotating the valve body 2, the following effects are obtained, which is extremely useful in industry. Pressure introducing holes 33, 34, 3 for switching the operation of the partition plate
Since the 5, 36 are integrally formed in the inner case, the pressure introduction pipes 51, 52, 53, 54 used in the conventional product become unnecessary, and the assembling becomes easy. Since the pilot valve 8 operated by the solenoid valve B is integrally formed in the case of the four-way valve A, the space is small.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

2 is a sectional view showing a state of a partition plate of the present invention, wherein A is a sectional view taken along the line II in FIG. 1, and B is a sectional view taken along the line R-R in FIG.

FIG. 3 is a partially cutaway perspective view showing a state where an inner case and a valve body of the present invention are separated.

FIG. 4 is a perspective view of a valve seat and a valve body of the present invention, wherein A is a perspective view of the valve body, and B is a perspective view of the valve seat.

5 is a cross-sectional view in a state where the valve seat and the valve element of the present invention are combined, wherein A is a cross-sectional view taken along the line II in FIG. 4, and B is a cross-sectional view taken along the roll in FIG.

FIG. 6 is a cross-sectional view of a prior art four-way valve.

FIG. 7 is a heat pump refrigeration circuit diagram using a four-way valve according to the present invention.

[Explanation of symbols]

A Four-way valve B Solenoid valve
C Compressor D Indoor heat exchanger E Capillary
F Outdoor heat exchanger 1 Valve seat 2 Valve
3 Case 4 Inner case 4a, 4b Wall 5 Plunger tube
6 Suction element 7 Plunger 8 Pilot valve
9 Spring 10 Coil 11 Central axis
12 Partition plate 13 Partition plate 14 Pilot valve sliding hole
14a Valve seat 15 Inlet 16 Outlet
17 Through hole 18 Through hole 19 Inlet pipe
20 Outlet pipe 21 Through-hole pipe 22 Through-hole pipe
23 Through-hole 24 Through-hole 25 Communication hole
26 airtight communication hole 27 high pressure chamber 28 pressure chamber
29 Pressure chamber 30 Partition wall 31 Communication hole
33 High pressure inlet 34 Low pressure inlet 35 Pressure inlet
36 Pressure introduction hole 37 Projection 38 Valve retainer
39 Set screw 51 High pressure inlet pipe 52 Low pressure inlet pipe
53 Pressure introduction pipe 54 Pressure introduction pipe 55 High pressure introduction hole
56 Low pressure introduction hole 57, 58 Pressure introduction hole 59 Lid
60 connecting plate 61 leaf spring 62 piston
63 piston 111 valve body 112 electromagnet
113 Valve seat 114 Plastic magnet valve
115 Center shaft 116 Case 117 Cap
118 Iron core 119 Coil 120, 121 Magnetic pole plate
122 retaining ring

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 4, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

2 is a sectional view showing a state of a partition plate of the present invention, wherein A is a sectional view taken along the line II in FIG. 1, and B is a sectional view taken along the line R-R in FIG.

FIG. 3 is a partially cutaway perspective view showing a state where an inner case and a valve body of the present invention are separated.

FIG. 4 is a perspective view of a valve seat and a valve body of the present invention, wherein A is a perspective view of the valve body, and B is a perspective view of the valve seat.

5 is a cross-sectional view in a state where the valve seat and the valve element of the present invention are combined, wherein A is a cross-sectional view taken along the line II in FIG. 4, and B is a cross-sectional view taken along the roll in FIG.

FIG. 6 is a cross-sectional view of a prior art four-way valve.

FIG. 7 is a heat pump refrigeration circuit diagram using a four-way valve according to the present invention.

FIG. 8 is a cross-sectional view of a conventional direct acting four-way valve.

[Description of Signs] A Four-way valve B Solenoid valve C
Compressor D Indoor heat exchanger E Capillary tube F
Outdoor heat exchanger 1 Valve seat 2 Valve body 3
Case 4 Inner case 4a, 4b Wall 5 Plunger tube 6
Suction element 7 Plunger 8 Pilot valve 9
Spring 10 Coil 11 Center axis 12
Partition plate 13 Partition plate 14 Pilot valve sliding hole 1
4a Valve seat 15 Inlet 16 Outlet 17
Through hole 18 Through hole 19 Inlet tube 20
Outlet pipe 21 Through-hole pipe 22 Through-hole pipe 23
Through hole 24 Through hole 25 Communication hole 26
Airtight communication hole 27 High pressure chamber 28 Pressure chamber 29
Pressure chamber 30 Partition wall 31 Communication hole 33
High pressure introduction hole 34 Low pressure introduction hole 35 Pressure introduction hole 36
Pressure introduction hole 37 Projection 38 Valve retainer 39
Set screw 51 High-pressure inlet pipe 52 Low-pressure inlet pipe 53
Pressure introduction pipe 54 Pressure introduction pipe 55 High pressure introduction hole 56
Low pressure introduction hole 57, 58 Pressure introduction hole 59 Lid 60
Connecting plate 61 Leaf spring 62 Piston 63
Piston 111 Valve body 112 Electromagnet 11
3 Valve seat 114 Plastic magnet valve body 11
5 center shaft 116 case 117 cap 11
8 Iron core 119 Coil 120, 121 Magnetic pole plate 12
2 retaining ring

Claims (1)

[Claims] 1. A resin inner case 4 provided integrally with a metal case 3, a metal valve seat 1 fixed to a lower end portion of the resin inner case 4, and a valve seat 1. An electromagnetic valve comprising a four-way valve A comprising a valve body 2 mounted on the upper part of the plunger 1 and rotating about a central axis 11 as a fulcrum, and an electromagnetic valve B having a pilot valve 8 at the tip of a plunger 7. A plunger 7 slidably inserted into a plunger tube 5 made of a non-magnetic material, and a bowl provided at the tip of the plunger 7. Pilot valve 8, a valve retainer 38 for pressing the pilot valve 8, a suction element 6 fixed to the upper end of the plunger tube 5 via a spring 9, and around the plunger tube 5. Placed coil 10
As a structure of the case 3, an attaching portion 3a for attaching the plunger tube 5 of the solenoid valve B is provided at an upper portion, and an opening 3b for sealingly attaching the valve seat 1 is provided at a lower end portion. As the structure of the inner case 4, one wall 4a and 4b for regulating the rotation angle of the valve body 2 and one for sliding the pilot valve 8 up and down to form a valve seat 14a. A pilot valve sliding hole 14 having a flat surface, a high pressure introducing hole 33 communicating with the pilot valve sliding hole 14, a pressure chamber 28,
The pressure introducing holes 35 and 36 communicating with the valve 29 and the low pressure introducing hole 34 communicating with the outlet pipe 20 through the communication hole 31 of the valve body 2, the high-pressure chamber 27 defined by the blade-like partition plates 12 and 13, and the pressure Chambers 28 and 29 are provided. As the structure of the metal valve seat 1, four openings 15, 1
6, 17 and 18 are provided on concentric circles and
Inlet pipe 19, outlet pipe 20, each communicating with one of the two openings,
As the structure of the valve body 2, four openings 1 of the valve seat 1 are provided.
At least two of the openings 5, 16, 17, and 18 are air-tightly communicated with each other, and the remaining openings are opened. The high-pressure chamber 27 and the pressure chamber 2 are in air-tight sliding contact with the inner surface of the inner case 4.
The four-way valve A is provided with a solenoid valve B at a mounting portion 3a on the upper part of the case 3.
An electromagnetic four-way valve characterized in that the plunger tube 5 is hermetically attached by brazing, and the valve seat 1 is hermetically attached to the opening 3b of the case 3 by brazing.