JP5928905B2 - Switching valve - Google Patents

Description

  The present invention relates to a switching valve for switching a refrigerant flow path such as a heat pump refrigeration cycle.

  Conventionally, as a switching valve, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 60-31565 (Patent Document 1). In this switching valve, a slide valve (valve element) is attached to a plunger driven by a solenoid which is an electromagnetic drive unit, and one input port and at least two output ports are formed on the same plane of a valve seat (valve seat). The slide valve is slid to selectively switch the conduction state between the input port and the output port.

Japanese Utility Model Publication No. 60-31565 JP 2010-112437 PR

  In the conventional switching valve, a high-pressure fluid flows from the input port to one of the output ports, but the fluid flows through the gap between the valve seat and the plunger. However, since the valve seat and the plunger are close to each other, it is necessary to increase the diameters of the input port and the output port in order to ensure a sufficient flow rate. However, when the diameters of the input and output ports are increased, it is necessary to increase the diameter of the slide valve (valve element).

  When the diameter of the slide valve is increased, the pressure receiving area is increased, so that the sliding resistance of the slide valve with respect to the valve seat (valve seat) is increased. Further, when the diameter of the slide valve is increased, the moving stroke is also increased. Therefore, it is necessary to increase the attractive force of the electromagnetic coil that drives the plunger, and there is a problem that the electromagnetic drive unit becomes large and the power consumption increases.

  This invention makes it a subject to provide the switching valve which made the valve port small and made the sliding distance (movement stroke) of a valve body and a plunger small.

The switching valve according to claim 1 is a valve seat member having a valve seat surface facing into the valve chamber and opening a plurality of ports in the valve seat surface, and a valve body having a seal surface sliding on the valve seat surface; An electromagnetic drive unit having a plunger that moves linearly while holding the valve body, wherein the plurality of ports are arranged along an axis that is a movement direction of the plunger, and the valve body is moved by the plunger. Accordingly, a switching valve that selectively opens and closes each of the plurality of ports with respect to the valve chamber to switch a flow path of the fluid flowing through the valve chamber, the valve body being connected to the plunger Is formed, and an equal flow path is formed in the entire outer periphery of the valve seat surface side of the opening of the valve body mounting hole.

  A switching valve according to a second aspect is the switching valve according to the first aspect, wherein the switching valve has a first port connected to the valve chamber, and the valve seat member includes a second port as the plurality of ports. A third port is formed, and by moving the valve body, the first port is electrically connected to the second port or the third port that is open to the valve chamber. To do.

  A switching valve according to a third aspect is the switching valve according to the first aspect, wherein the switching valve has a first port connected to the valve chamber, and the valve seat member includes a second port as the plurality of ports. A third port is formed, a fourth port is formed between the second port and the third port, the sealing surface of the valve body is annular, and the valve body A recess is formed on the inner side of the sealing surface, and the valve body is moved to conduct the first port to the second port or the third port that is open with respect to the valve chamber. The third port or the second port that is closed with respect to the chamber is electrically connected to the fourth port by a concave portion of the valve body.

  A switching valve according to a fourth aspect is the switching valve according to the second or third aspect, wherein the first port is formed in the valve seat member, and the first port is located outside the sealing surface. It is characterized by opening adjacent to the body.

  The switching valve according to claim 5 is the switching valve according to any one of claims 1 to 4, wherein the flow path is a tapered surface formed on an outer periphery of the opening of the valve body mounting hole, or a valve It is comprised by the step part which hollowed the outer periphery of the opening part of a body attachment hole, It is characterized by the above-mentioned.

  A switching valve according to a sixth aspect is the switching valve according to any one of the first to fifth aspects, wherein a gap is provided between the valve body mounting hole and the valve body, and the switching valve is arranged around the plunger axis. The valve body does not follow the rotation of the plunger during rotation, and the plunger contacts the valve seat member.

  A switching valve according to a seventh aspect is the switching valve according to any one of the first to sixth aspects, further comprising a bracket for attaching the switching valve to another device, wherein the bracket and the valve seat member are It is formed integrally.

  According to the switching valve of the first aspect, the fluid in the valve chamber flows through the ports that are opened by selectively opening and closing the plurality of ports formed in the valve seat member by the valve body. At this time, since the flow rate formed in the outer periphery of the opening of the valve body mounting hole of the plunger can sufficiently secure the flow rate of the fluid flowing through the opened port, the port can be minimized. Since the distance between the ports can be reduced, the valve body can be reduced. Therefore, the sliding distance between the valve body and the plunger can be reduced, and the valve body can be easily moved. In addition, the electromagnetic drive unit can be made smaller and the power consumption can be reduced.

  According to the switching valve of the second aspect, in addition to the effect of the first aspect, the switching valve is configured as a three-way switching valve for selectively flowing a high-pressure fluid from the first port to the second port or the third port. Can do.

  According to the switching valve of the third aspect, in addition to the effect of the first aspect, a high-pressure fluid is allowed to flow from the first port to the second port or the third port, and the other third port or second The port can be configured as a four-way switching valve that selectively conducts to the fourth port on the low pressure side.

  According to the switching valve of the fourth aspect, in addition to the effect of the second or third aspect, since the first to third ports are formed in one valve seat member, the connecting portion of the capillary corresponding to each port Can be collected on the valve seat member side, and the switching valve becomes compact.

  According to the switching valve of the fifth aspect, the same effects as those of the first to fourth aspects can be obtained.

  According to the switching valve of the sixth aspect, in addition to the effects of the first to fifth aspects, the flow of the fluid can be secured by the flow path, so that the gap between the plunger and the valve seat member can be made as small as possible, and the valve of the plunger Since there is a gap between the body mounting hole and the valve body, even if the plunger rotates, the valve body does not follow and the plunger comes into contact with the valve seat member, so that the sealing performance of the valve body can be ensured.

  According to the switching valve of the seventh aspect, in addition to the effects of the first to sixth aspects, the bracket for attaching the switching valve to another device such as a four-way switching valve is integrally formed with the valve seat member. The bracket can be firmly fixed to the main body of another apparatus by welding or brazing.

It is the principal part left sectional view and principal part front sectional view of the switching valve of 1st Embodiment of this invention. It is the plane sectional view and principal part front sectional view of the switching valve of 1st Embodiment of this invention. It is CC sectional drawing and the principal part bottom view of FIG. 2 (A). It is the front view and left view of a four-way switching valve which use the switching valve of 1st Embodiment of this invention as a drive source. It is a figure explaining the effect of rotation prevention of the valve body in the embodiment of the present invention. It is the plane sectional view and principal part front sectional view of the switching valve of 2nd Embodiment of this invention. It is EE sectional drawing and the principal part bottom view of FIG. 6 (A). It is the front view and left view of a four-way switching valve which use the switching valve of 2nd Embodiment of this invention as a drive source. It is principal part left sectional drawing of the switching valve of 3rd Embodiment of this invention. It is a left view of the four-way switching valve which uses the switching valve of 3rd Embodiment of this invention as a drive source. It is the front view and left view of a four-way switching valve which uses the conventional switching valve as a drive source. It is a principal part front sectional view of the switching valve of 4th Embodiment of this invention.

  Next, an embodiment of the switching valve of the present invention will be described with reference to the drawings. FIG. 1 is a left side sectional view (FIG. 1 (A)) and a main sectional front view (FIG. 1 (B)) of a main part of the switching valve of the first embodiment, and FIG. Figure (Fig. 2 (A)) and main part front sectional view (Fig. 2 (B)), Fig. 3 is a sectional view taken on line CC of Fig. 2 (A) (Fig. 3 (A)) and main part bottom view (Fig. 3 (B)) and FIG. 4 are a front view (FIG. 4 (A)) and a left side view (FIG. 4 (B)) of the four-way switching valve using the switching valve of the first embodiment as a drive source. Note that FIG. 1B is a cross-sectional view taken along the line AA in FIG. FIG. 2 (B) is a cross-sectional view taken along the line BB including the axis L in FIG. 2 (A), and illustration of the plunger and the valve body is omitted. In FIG. 3B, the bracket is not shown.

  As shown in FIG. 4, the switching valve 10 of this embodiment is configured as a pilot valve for driving a four-way switching valve 20 connected to the refrigeration cycle. The pilot valve is also a “four-way switching valve”. The four-way switching valve 20 has a cylindrical valve housing 20a and joint pipes 201, 202, 203, and 204 connected to the piping of the refrigeration cycle. The switching valve 10 is attached to the valve housing 20a via a bracket 2C described later. The bracket 2C and the valve housing 20a are fixed by welding or brazing. The switching valve 10 has capillaries 211, 221, 231, 241 described later. The capillaries 211, 241 are respectively connected to the joint pipes 201, 204 of the four-way switching valve 20, and the capillaries 221, 231 are connected to the four-way switching valve 20. Are connected to both ends of the valve housing 20a. A piston valve (not shown) is disposed in the valve housing 20a of the four-way switching valve 20. The switching valve 10 switches and supplies the high-pressure fluid from the joint pipe 201 to the capillary 221 or the capillary 231 by driving the electromagnetic drive unit 5. Thereby, the piston valve in the valve housing 20a is operated by the pressure difference between the internal spaces at both ends of the valve housing 20a, and the flow path of the fluid flowing through the joint pipes 201 to 204 connected to the valve housing 20a is switched.

  As shown in FIGS. 1 to 3, the switching valve 10 includes a non-magnetic cylindrical plunger tube 1 that forms a valve chamber 1A at the end, a valve seat member 2 attached to the plunger tube 1, and a plunger. It has the valve body 3 arrange | positioned in the tube 1, the plunger 4 holding the valve body 3, and the electromagnetic drive part 5 (refer FIG. 2 (A)) attached to the circumference | surroundings of the plunger tube 1. . A valve seat member 2 is attached to the bottom surface of the valve chamber 1 </ b> A of the plunger tube 1, and a substantially cylindrical plunger 4 is disposed in the plunger tube 1.

  The valve seat member 2 has a substantially cylindrical shape, and is configured by integrally forming a main body portion 2A, a valve seat portion 2B having a slightly smaller diameter than the main body portion 2A, and a bracket 2c. The valve seat portion 2B is fitted into a circular fitting hole 11 formed in the plunger tube 1, and the valve seat member 2 is attached to the plunger tube 1 by brazing or welding. Thereby, the valve seat member 2 is arranged in the valve chamber 1A with the valve seat surface facing.

  The valve seat portion 2B includes a D port 21 as a “first port” that opens to the valve seat surface, a C switching port 22 as a “second port”, and an E switching port 23 as a “third port”. And an S port 24 as a “fourth port”. In the main body 2A, capillary mounting holes 21a, 22a, 23a, and 24a are formed to communicate with the D port 21, the C switching port 22, the E switching port 23, and the S port 24 from the bracket 2C side.

  The capillary 211 is connected to the D port 21 via the capillary attachment hole 21a, and the capillary 221 is connected to the C switching port 22 via the capillary attachment hole 22a. A capillary 231 is connected to the E switching port 23 via the capillary attachment hole 23a, and a capillary 241 is connected to the S port 24 via the capillary attachment hole 24a. The capillaries 211, 221, 231, and 241 are drawn from the opening of the bracket 2C. In the following description, when the D port 21, the C switching port 22, the E switching port 23, and the S port 24 are generically referred to, they are also simply referred to as “ports”.

  The valve body 3 has a substantially cylindrical shape, and has an annular seal surface 3 a that slides on the valve seat surface of the valve seat member 2, and a recess 31 is provided inside the seal surface 3 a so as to face the valve seat surface. Is formed. The valve body 3 is inserted through a valve spring 32 into a later-described valve body mounting hole 43 of the plunger 4. Thereby, the valve body 3 can slide with respect to the valve seat surface of the valve seat member 2 by the movement of the plunger 4.

  The plunger 4 has a cylindrical portion 41 aligned with the inner surface of the plunger tube 1 and a holding portion 42 formed at the end of the cylindrical portion 41, and the holding portion 42 has a valve seat surface of the valve seat member 2. A cylindrical valve body mounting hole 43 is formed so as to face the surface. Further, a tapered surface 44 having a truncated cone shape is formed on the outer periphery of the opening of the valve body mounting hole 43, and a space on the valve seat surface side of the tapered surface 44 is formed with an annular flow path 44A. It has become. Note that the width [D] of the flow path 44A shown in FIG. 1 (A) and the port diameter [φd] shown in FIG. 1 (B) have a relationship of D> φd.

  The electromagnetic drive unit 5 includes an electromagnetic coil 51 fitted around the plunger tube 1, an outer box 52, an attractor 53 fitted to the end of the plunger tube 1, and the attractor 53 and the plunger 4. And a coil spring 54 disposed therebetween.

  With the above configuration, when the electromagnetic coil 51 is energized, the plunger 4 is attracted to the attractor 53 against the urging force of the coil spring 54 by the magnetic force, and the valve body 3 forms the recess 31 in the S port 24 and the E switching port 23. Move to a position that covers In this state, the S port 24 and the E switching port 23 are covered with the valve body 3 and are closed with respect to the valve chamber 1A, and the S port 24 and the E switching port 23 are electrically connected by the recess 31. Further, the C switching port 22 is opened with respect to the valve chamber 1A, and the D port 21 is electrically connected to the C switching port 22 through the valve chamber 1A. At this time, the high-pressure fluid flowing from the D port 21 into the valve chamber 1 </ b> A flows to the C switching port 22 through the flow path 44 </ b> A around the valve body mounting hole 43.

  When the energization of the electromagnetic coil 51 is interrupted, the plunger 4 is separated from the attractor 53 by the biasing force of the coil spring 54. In this state, the S port 24 and the C switching port 22 are covered with the valve body 3 and are closed with respect to the valve chamber 1 </ b> A, and the S port 24 and the C switching port 22 are electrically connected by the recess 31. Further, the E switching port 23 is opened with respect to the valve chamber 1A, and the D port 21 is electrically connected to the E switching port 23 through the valve chamber 1A. At this time, the high-pressure fluid flowing from the D port 21 into the valve chamber 1A passes through the flow path 44A around the valve body mounting hole 43 outside the valve body 3, as indicated by an arrow in FIG. To the E switching port 23.

  As described above, since the high-pressure fluid from the D port 21 flows to the E switching port 23 or the C switching port 22 via the flow path 44A, a sufficient flow rate of this fluid can be ensured. Therefore, since the diameter of each port can be reduced to the minimum, the interval between each port can also be reduced, and the diameter of the recess 31 of the valve body 3 can be reduced. The valve body 3 is subjected to differential pressure between the recess 31 of the valve body 3 and the valve chamber 1A. However, since the diameter of the recess 31 can be reduced, the pressure receiving area of the valve body 3 is reduced and the movement of the valve body 3 is reduced. It becomes easy. Moreover, since each port diameter and the diameter of the recessed part 31 can be made small, the moving stroke of the valve body 3 and the plunger 4 can be made small. Therefore, it is possible to reduce the electromagnetic drive unit 5 and to reduce power consumption.

  Further, since a high-pressure fluid flows from the D port 21, the plunger 4 rotates around the axis L as indicated by an arrow in FIG. However, since the flow of the high-pressure fluid can be ensured by the flow path 44A, the gap (the gap other than the flow path 44A) between the holding portion 42 of the plunger 4 and the valve seat member 2 can be made as small as possible, and the valve body of the plunger 4 is attached. Since there is a gap between the hole 43 and the valve body 3, even if the plunger 4 rotates, the valve body 3 does not follow and the plunger 4 contacts the valve seat member 2, so that the sealing performance of the valve body 3 can be secured. .

  As a means for preventing rotation of the plunger, it is conceivable that a protrusion is provided on the plunger and the protrusion is brought into contact with the valve seat member. However, this increases the sliding resistance. On the other hand, according to the above-described embodiment, the plunger 4 and the valve seat member 2 are merely in contact with each other at a point, the noise resistance is small, and the operating voltage of the electromagnetic drive unit 5 can be reduced.

  As shown in FIG. 1B, the S port 24 (fourth port), the C switching port 22 (second port), and the E switching port 23 (third port) are alternately arranged with respect to the axis L. It arrange | positions in the position shifted | deviated and, thereby, can cover two ports by this recessed part 31, making the recessed part 31 of the valve body 3 small. Note that the “second and third ports” C switching port 22 and E switching port 23 and the “fourth port” S port 24 are arranged along the axis L, respectively.

  In addition, the inner diameter of the valve body mounting hole 43 of the plunger 4 is slightly larger than the outer diameter of the valve body 3. Due to the gap between the valve body mounting hole 43 and the valve body 3, the valve body when the plunger 4 is initially moved. The movement of the valve body 3 is facilitated by the inner surface of the mounting hole 43 being in contact with the valve body 3. This is a so-called kick operation.

  6 is a plan sectional view (FIG. 6 (A)) and a main sectional front sectional view (FIG. 6 (B)) of the switching valve of the second embodiment, and FIG. 7 is a sectional view taken along line EE of FIG. FIG. 7 (A)) and bottom view of the main part (FIG. 7 (B)), FIG. 8 is a front view (FIG. 8 (A)) and left side view of the four-way switching valve using the switching valve of the second embodiment as a drive source It is a figure (FIG. 8 (B)). FIG. 6B is a DD cross-sectional view including the axis L in FIG. 6A, and illustration of the plunger and the valve body is omitted. In FIG. 7B, the bracket is not shown. In the following embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 5 and detailed description thereof is omitted. Also in the following embodiments, it is the same that the effects of the flow path 44A in the first embodiment can be obtained.

  The difference between the second embodiment and the first embodiment is a capillary mounting structure, a bracket structure, and a valve body mounting structure. As shown in FIG. 8, the four-way switching valve 20 is the same as in the first embodiment, and the switching valve 10 is attached to the valve housing 20 a of the four-way switching valve 20 via the bracket 6. The bracket 6 and the valve seat member 2 are fixed by welding or brazing. The bracket 6 and the valve housing 20a of the four-way switching valve 20 are fixed by welding or brazing. The bracket 2C of the first embodiment has an opening for pulling out the capillary, but the bracket 6 of the second embodiment has a simple rectangular shape.

  In the second embodiment, capillary mounting holes 21a ', 22a', 23a ', 24a' communicating with the D port 21, C switching port 22, E switching port 23, and S port 24 of the valve seat member 2 are provided. , Each port is formed at a right angle. A capillary 211 ′ is connected to the D port 21 via the capillary attachment hole 21 a ′, and a capillary 221 ′ is connected to the C switching port 22 via the capillary attachment hole 22 a ′. A capillary 231 'is connected to the E switching port 23 through the capillary mounting hole 23a', and a capillary 241 'is connected to the S port 24 through the capillary mounting hole 24a'.

  Further, in the second embodiment, a through hole 45 is formed that communicates from the valve body mounting hole 43 of the plunger 4 to the inner peripheral side of the plunger tube 1. In the first embodiment, the valve body 3 is pressed against the valve seat member 2 by the valve spring 32. In the second embodiment, the high pressure in the plunger tube 1 (in the valve chamber 1A) is applied to the through hole. By introducing from 45, the valve body 3 is pressed to the valve seat member 2 side by the differential pressure between the low pressure in the recess 31 of the valve body 3 and the high pressure of the through hole 45. This eliminates the need for a valve spring.

  As described above, in the second embodiment, the capillaries 211 ', 221', 231 ', and 241' are attached to the valve seat member 2 at right angles to the respective ports. A simple structure having no opening or the like can be obtained.

  FIG. 9 is a left side sectional view of an essential part of the switching valve of the third embodiment, and is a sectional view corresponding to FIG. 7A of the second embodiment. FIG. 10 is a left side view of a four-way switching valve using the switching valve of the third embodiment as a drive source, and the front view is the same as FIG. 8 (A). In the third embodiment, a bracket 2C is formed integrally with a valve seat member 2 similar to the second embodiment. Other configurations and operations are the same as those of the second embodiment. As shown in FIG. 10, the switching valve 10 of the third embodiment is also configured as a pilot valve for driving a four-way switching valve 20 connected to the refrigeration cycle. The four-way switching valve 20 is the same as in the first and second embodiments, and the switching valve 10 is attached to the valve housing 20a of the four-way switching valve 20 via a bracket 2C. The bracket 2c and the valve housing 20a are fixed by welding or brazing.

  FIG. 11 is a front view and a left side view of a four-way switching valve using a conventional switching valve as a drive source (Japanese Patent Laid-Open No. 2010-112437). This conventional switching valve 30 is attached to the valve housing 20 a of the four-way switching valve 20 using a mounting bracket 50. The mounting bracket 50 has two gripping portions 501 and 501, and the gripping portions 501 and 501 each have a pair of arms 501 a and 501 a. The switching valve 30 is gripped by the arms 501a and 501a, and the switching valve 30 is fixed to the mounting bracket 50 by caulking the ends of the arms 501a and 501a. The mounting bracket 50 and the valve housing 20a are fixed by welding or brazing.

  Thus, since the conventional switching valve 30 is caulked and fixed by the mounting bracket 50, the mounting bracket 50 is necessary and the number of parts increases. In addition, a caulking process is required, and the number of assembly steps increases. Furthermore, there is room for improvement in terms of fixing strength due to loosening of the caulking portion. On the other hand, according to the switching valve 10 of the third embodiment, since the bracket 2C is integrally formed with the valve seat member 2, the number of parts can be reduced, the caulking process is not required, and the number of assembly steps can be reduced. . In addition, the integrated structure improves the fixing strength, and the structure is strong against vibration.

  FIG. 12 is a front sectional view of a principal part of the switching valve of the fourth embodiment, corresponding to FIG. 1 (B) of the first embodiment. Elements similar to those of the first embodiment are denoted by the same reference numerals as in FIGS. 1 to 5 and detailed description thereof is omitted. The switching valve 40 of the fourth embodiment is configured as a three-way valve. As shown in FIG. 12, the valve seat member 7 attached to the plunger tube 1 has the same external shape as the valve seat member 2 of the first embodiment, and the valve seat member 7 has a valve seat portion 7B. Yes. Further, the valve body 8 has a cylindrical shape having a smaller diameter than the valve body 3 of the first embodiment, and has the same circular sealing surface as the cross section shown in FIG.

  The plunger 9 is substantially the same type as the plunger 4 of the first embodiment, but the diameter of the valve body mounting hole 93 formed in the holding portion 92 and the flow path 94 </ b> A corresponds to the diameter of the valve body 8. It is smaller than the valve body mounting hole 43 and the flow path 44A in the embodiment. The valve body 8 is inserted into the valve body mounting hole 93 of the plunger 9. As in the first embodiment, the valve body 8 slides with respect to the valve seat surface of the valve seat member 7 by the movement of the plunger 9. It is possible to move. Note that the flow path 94A is formed by a tapered surface having a side surface shape of a truncated cone as in the first embodiment.

  The valve seat member 7 is disposed in the valve chamber 1A with the valve seat surface facing, and the valve seat portion 7B has a D port 71 as a “first port” that opens to the valve seat surface, A switching port 72 as a "port of the second" and a switching port 73 as a "third port" are formed. Although not shown in the drawing, capillaries are connected to these ports.

  With the above configuration, when an electromagnetic coil of an electromagnetic drive unit similar to that of the first embodiment (not shown) is energized, the plunger 9 is moved, and the valve body 8 is moved to a position where the switching port 73 is covered with the sealing surface. In this state, the switching port 73 is closed and the switching port 72 is opened. Then, the D port 71 conducts to the switching port 72 through the valve chamber 1A. At this time, the high-pressure fluid flowing from the D port 71 into the valve chamber 1 </ b> A flows to the switching port 72 via the flow path 94 </ b> A around the valve body mounting hole 93.

  When the energization of the electromagnetic coil is interrupted, the plunger 9 moves to the position shown in FIG. 12, and the valve body 8 moves to a position where the switching port 72 is covered with the sealing surface. In this state, the switching port 72 is closed and the switching port 73 is opened. Then, the D port 71 is electrically connected to the switching port 73 via the valve chamber 1A. At this time, the high-pressure fluid flowing from the D port 71 into the valve chamber 1A is switched to the switching port via the flow path 94A around the valve body mounting hole 93 outside the valve body 8 as indicated by arrows in FIG. It flows to 73.

  As described above, since the high-pressure fluid from the D port 71 flows to the switching port 73 or the switching port 72 via the flow path 94A, a sufficient flow rate of this fluid can be ensured. Therefore, since the diameter of each port can be reduced to the minimum, the interval between each port can also be reduced, and the diameter of the valve body 8 can be reduced. Therefore, similarly to the above-described embodiment, the pressure receiving area of the valve body 8 is reduced and the movement of the valve body 8 is facilitated. Moreover, since each port diameter can be made small, the moving stroke of the valve body 8 and the plunger 9 can be made small. Therefore, it is possible to reduce the electromagnetic drive unit and power consumption.

  In the above embodiment, the flow paths 44A and 94A are configured by tapered surfaces, but the flow paths may be formed by stepped portions that allow the outer periphery of the opening of the valve body mounting hole to be depressed. .

  In addition, in each embodiment, the valve seat members 2 and 7 and the plungers 4 and 9 can be formed by metal injection molding (MIM: Metal Injection Molding).

  In the embodiment, the D port and capillary into which the high-pressure side fluid flows are formed on the valve seat member side. For example, a high-pressure side capillary is connected to the end or side of the plunger tube 1. A high-pressure fluid may be introduced from the capillary into the valve chamber. Even in this case, the high-pressure fluid flowing into the valve chamber can flow to the E switching port 22 or the C switching port 23, the switching port 72 or the switching port 73 via the flow paths 44A and 94A. Similar effects can be obtained.

  In the first to fourth embodiments, an example of a switching valve configured as a pilot valve has been described. However, the switching valve of the present invention is a three-way switching valve that switches a flow path of a refrigeration cycle or a flow path of another piping system. It can also be configured as a four-way switching valve. Moreover, it can also be configured as a switching valve that switches between five or more ports.

  In the embodiment, the valve seat members 2 and 7 have a substantially cylindrical shape, but may have a prismatic shape. In the embodiment, the valve bodies 3 and 8 have a substantially cylindrical shape, but may have an elliptical column shape. The sealing surface 3a has an annular shape, but may have an elliptical shape. These shapes are not limited to the shapes of the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Plunger tube 2 Valve seat member 21 D port (first port)
22 C switching port (second port)
23 E switching port (third port)
24 S port (4th port)
32 Valve spring 3 Valve body 3a Seal surface 31 Recess 4 Plunger 43 Valve body mounting hole 44 Tapered surface 44A Flow path 5 Electromagnetic drive unit 7 Valve seat member 71 D port (first port)
72 switching port (second port)
73 Switching port (third port)
10 Switching valve (Pilot valve: Four-way switching valve)
20 Four-way switching valve 40 Switching valve (three-way switching valve)

Claims (7)

A valve seat member that opens a plurality of ports in the valve seat surface with the valve seat surface facing the valve chamber, a valve body having a seal surface that slides on the valve seat surface, and a straight line that holds the valve body An electromagnetic drive unit having a plunger that moves in a moving manner, wherein the plurality of ports are arranged along an axis that is a movement direction of the plunger, and the valve body is moved by the plunger, whereby the valve chamber is moved. A switching valve that selectively opens and closes each of the plurality of ports and switches a flow path of the fluid flowing through the valve chamber,
A valve body mounting hole for inserting the valve body is formed in the plunger, and a uniform flow path is formed in the entire circumference of the opening on the valve seat surface side of the opening of the valve body mounting hole . A switching valve characterized by that.   A first port that conducts to the valve chamber; the valve seat member includes a second port and a third port as the plurality of ports; 2. The switching valve according to claim 1, wherein the first port is electrically connected to the second port or the third port which is open to the valve chamber.   A first port connected to the valve chamber; the valve seat member includes a second port and a third port as the plurality of ports; and the second port and the third port A fourth port is formed in the middle of the port, the sealing surface of the valve body is annular, and the valve body is formed with a recess inside the sealing surface, and by moving the valve body, The first port is electrically connected to the second port or the third port that is open with respect to the valve chamber, and the third port or the second port that is closed with respect to the valve chamber is 2. The switching valve according to claim 1, wherein the switching valve is electrically connected to the fourth port by a concave portion of the valve body.   The said 1st port is formed in the said valve seat member, The said 1st port is opened outside the said sealing surface adjacent to the said valve body, The Claim 2 or 3 characterized by the above-mentioned. Switching valve.   The said flow path is comprised by the taper surface formed in the outer periphery of the opening part of the said valve body attachment hole, or the step part which the outer periphery of the opening part of the valve body attachment hole was dented. The switching valve of any one of thru | or 4.   A gap is provided between the valve body mounting hole and the valve body, and when the plunger rotates about the axis, the valve body does not follow the rotation of the plunger and the plunger contacts the valve seat member. The switching valve according to any one of claims 1 to 5, wherein the switching valve is configured as described above. The switching valve according to any one of claims 1 to 6,
A switching valve comprising a bracket for attaching the switching valve to another device, wherein the bracket and the valve seat member are integrally formed.

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