CN117366921A - Switching valve and refrigeration cycle system - Google Patents

Abstract

The invention provides a switching valve and a refrigeration cycle system capable of improving strength against external force and inhibiting size. The pilot driving part (12) of the switching valve (10) is provided with a valve seat member (122) fixed to the switching valve body (11), a plurality of tubule communication holes connected to a plurality of tubules connected to the peripheral surface and forming a flow path of driving fluid together with the tubules are formed in the valve seat member (122), and a valve seat through hole (122 d) penetrating from a fixed part (122 c) of the switching valve body (11) to an inlet part (122 b) entering the pilot body (121) and forming a flow path of driving fluid, the valve seat through hole (122 d) is opened in a manner deviating from the valve seat (122 a), the plurality of tubule communication holes are opened in the valve seat (122 a), and a main body through hole (111 a) forming a flow path of driving fluid together with the valve seat through hole (122 d) is formed in the outer wall of the main casing (111) of the switching valve body (11).

Description

Switching valve and refrigeration cycle system

Technical Field

The present invention relates to a switching valve for switching a flow path of a refrigerant used in a refrigeration cycle system such as an air conditioner, and a refrigeration cycle system.

Background

In the related art, a switching valve is disclosed that is configured to include a pilot driving portion that is coupled to a switching valve body via a bracket to slide a spool therein, and that includes a plurality of tubules connected to the pilot driving portion to allow a driving fluid of the main spool to pass therethrough (see, for example, patent document 1). Among brackets in which the pilot drive portion is coupled to the switching valve body, there is a metal plate processing type having a pair of holding plates having one end side fixed to the switching valve body and the other end side holding the pilot drive portion, and the type of brackets are also used in the switching valve described in patent document 1.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2010-112437

Disclosure of Invention

Problems to be solved by the invention

Here, most brackets formed as the above-described metal plate members are easily deformed, and the strength against external force is often low, leaving room for improvement. In addition, the number of components of the switching valve in this manner is large, and there is room for improvement in this respect.

The invention aims to provide a switching valve and a refrigeration cycle system which can improve strength against external force and can restrain size.

Means for solving the problems

The switching valve of the present invention is characterized by comprising: a switching valve body having a main spool therein, for receiving the sliding movement of the main spool and switching the flow path state; a pilot drive unit that slides the main spool using a predetermined drive fluid; and a plurality of thin pipes connected to the pilot driving section to allow the driving fluid to pass therethrough, wherein the pilot driving section includes a pilot body in which a sub spool is incorporated, the sub spool is slid by sliding the main spool in order to switch a flow path state of the driving fluid, the valve seat member is a portion connected to the plurality of thin pipes and fixed so that a part of the thin pipes is fixed to the switching valve body and the other part thereof enters the pilot body to form a valve seat, a plurality of thin pipe communication holes connected to the plurality of thin pipes to form a flow path of the driving fluid together with the plurality of thin pipes, and a valve seat through hole penetrating from a fixing portion of the switching valve body to an entering portion of the pilot body to form a flow path of the driving fluid are formed, one of the plurality of thin pipe communication holes and the valve seat through hole is opened off from the valve seat, the other plurality of holes are opened and closed by the sub spool at the valve seat, the switching valve body includes the main spool and the main spool housing, wherein the main spool housing is connected to the main spool and the valve seat member is fixed to form the valve seat through hole together with the outer wall.

The switching of the channel state herein is a technical concept including switching of a channel in which a certain channel is changed to another channel, and switching of opening and closing of a channel in which one channel is closed or opened.

According to this switching valve, since the valve seat member constituting the pilot driving portion is directly fixed to the switching valve body, strength against external force can be improved as compared with a case where the pilot driving portion and the switching valve body are coupled using a bracket formed of a metal plate. Further, since the bracket is not required, the number of components can be suppressed, and accordingly the size of the switching valve can be suppressed.

Here, it is preferable that a plurality of joint pipes communicating with the inside of the main casing are connected to the switching valve main body, and the valve seat member of the pilot driving portion is fixed to the outer wall of the main casing so that the valve seat through-hole is connected to a valve chamber communicating with a high-pressure joint pipe through which a relatively high-pressure fluid flows, of the plurality of joint pipes, via the main body through-hole.

According to this configuration, the high-pressure fluid flow path connecting the valve chamber of the switching valve body to the pilot drive section is constituted by the valve seat through-hole in the valve seat member and the body through-hole in the switching valve body. This makes it possible to further improve the strength by minimizing the flow passage of the high-pressure fluid, as compared with the case where the valve chamber and the pilot drive section are connected by the high-pressure tubule, and to further reduce the size of the switching valve by eliminating the need for the high-pressure tubule.

Preferably, the main casing is formed in a tubular shape, and houses the main spool so that the main spool slides along an axis thereof, and the pilot body includes the sub spool and a sub casing, wherein the sub casing is formed in a tubular shape, houses the sub spool so that the sub spool slides along an axis thereof, and the pilot driving unit is attached to the switching valve body in a configuration in which the axis of the main casing and the axis of the sub casing extend along each other.

According to this configuration, the main casing of the switching valve main body and the sub-casing of the pilot driving portion are mounted in a configuration in which the respective axes extend along each other. In this arrangement, the center of gravity of the pilot driving portion is closer to the switching valve main body than in the arrangement in which the axis of the main casing and the axis of the sub-casing are orthogonal to each other, and as a result, the size of the switching valve can be further suppressed in the direction orthogonal to the two axes. Further, since the center of gravity of the pilot driving portion is close to the switching valve main body side, the strength of the switching valve against external force can be further improved.

Further, it is preferable that a plurality of joint pipes communicating with the inside of the main casing are connected to the switching valve main body in an arrangement in which the respective axes are included in one plane, and the switching valve main body, the pilot driving section, and the plurality of joint pipes are arranged such that the main spool and the sub spool each slide in an in-plane direction of the plane including the respective axes of the plurality of joint pipes.

According to this configuration, since the sliding direction of the main spool in the switching valve main body and the sub spool in the pilot driving portion is an in-plane direction of a plane including the axes of the plurality of joint pipes, the switching valve is thinned in the out-of-plane direction of the plane. That is, according to the above configuration, the size of the switching valve can be further suppressed.

Preferably, the valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixing portion, and a part of a circumferential surface thereof is a flat surface extending in the axial direction, and the plurality of tubules are connected to the flat surface.

According to this configuration, when the plurality of tubules and the valve seat member are connected by brazing, the annular solder can be disposed on the flat surface of the valve seat member, so that workability related to brazing can be improved.

Preferably, the pilot body in the pilot driving unit includes: a plunger that holds the sub spool and is provided so as to be slidable along a predetermined slide axis; a plunger tube that slidably accommodates the plunger together with the sub spool; a coil part wound around the outer periphery of the plunger tube, the coil part being configured to slide the plunger along the sliding axis by being supplied with current; and a joint portion that joins the coil portion and the lead wire that supplies the current to the coil portion, wherein the joint portion is configured to avoid interference with the switching valve body from the coil portion, and the joint portion is configured to protrude from the coil portion in an orthogonal direction orthogonal to the sliding axis, wherein the coil portion is configured to have a first portion provided with the joint portion and a second portion other than the first portion, and wherein a first length from the sliding axis to a fixed end of the switching valve body in the valve seat member is shorter than a second length from the sliding axis to a protruding end of the joint portion, and is longer than a third length from the sliding axis to an outer surface of the second portion in the coil portion.

According to this configuration, the size of the valve seat member is optimized to be minimum by the above-described first length regulation in the orthogonal direction orthogonal to the sliding axis of the pilot driving portion, so that the center of gravity of the pilot driving portion approaches the switching valve main body side. This can further improve the strength of the switching valve against external force and further suppress the size of the switching valve.

Preferably, the valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixed portion, a pillar portion located between the pilot body and the switching valve body and fixed to the switching valve body at the fixed portion to support the pilot body is thicker than the inlet portion, a stepped portion is formed at a boundary between the pillar portion and the inlet portion, and the inlet portion is fixed to the pilot body in a state where the stepped portion is engaged with an outer peripheral surface of the pilot body in a contact manner.

According to this structure, the pillar portion supporting the pilot body in the valve seat member is thicker and more rigid than the entering portion, so that the strength of the switching valve against external force can be further improved. Further, since the stepped portion is engaged so as to contact the outer peripheral surface of the pilot body, when the valve seat member is fixed to the pilot body, the valve seat member can be positioned with respect to the pilot body with good workability.

Preferably, the valve seat member is a member in which the plurality of tubule communication holes and the valve seat through-hole are formed in a solid body.

According to this structure, since the valve seat member is made of a solid body and has high rigidity, the strength of the switching valve against external force can be further improved.

Preferably, the valve seat member has a valve seat side engagement surface formed on the fixing portion so as to be in surface contact with the switching valve body, and a receiving recess is formed on an outer wall of the main casing of the switching valve body, the main body side engagement surface being in surface contact with the valve seat side engagement surface, the receiving recess being a bottom surface, and the fixing portion being fixed to the outer wall of the main casing in a state in which a part of an outer peripheral surface of the valve seat side engagement surface is surrounded by the fixing portion so as to be in contact with a part of an inner peripheral surface of the receiving recess.

According to this configuration, when the valve seat member and the switching valve body are connected by brazing, the brazing can be performed in a stable state in which the valve seat side engagement plane is brought into surface contact with the body side engagement plane. Further, since the valve seat member is fixed in a state in which the fixing portion is engaged with the receiving recess portion in the main housing, the strength of the switching valve against external force can be further improved.

Preferably, the valve seat through hole in the valve seat member includes a first hole portion located on the side of the inlet portion, a second hole portion located on the side of the fixed portion and having a larger diameter than the first hole portion, and a step portion located at a boundary between the first hole portion and the second hole portion and connecting the first hole portion and the second hole portion, and the main body through hole in the main housing is a hole having a smaller diameter than the second hole portion in the valve seat through hole, and further includes a filter accommodated in the second hole portion and removing foreign matter from the driving fluid flowing through the valve seat through hole, wherein the step portion restricts movement of the filter to the side of the first hole portion in the interior of the second hole portion, and a peripheral edge portion of the main body through hole in an outer wall of the main housing restricts movement of the filter to the side of the main body through hole in the interior of the second hole portion.

According to this configuration, the filter for removing the foreign matter is housed in the valve seat through hole while restricting the movement of the driving fluid in the flow direction, so that the filter can be effectively prevented from being pushed by the driving fluid to move and from falling off, and foreign matter can be removed. Further, since the filter is housed in the valve seat through hole where a margin is easily provided in space, the size of the switching valve related to the filter installation can be suppressed as compared with a case where a part of the tubule is enlarged in the tubule to house the filter. In addition, according to the movement restriction of the filter by utilizing the difference between the stepped structure inside the valve seat through hole and the diameter of the main body through hole, the number of members can be suppressed and the cost can be reduced as compared with the case where, for example, a stopper of another member is provided for restricting the movement.

The refrigeration cycle system according to the present invention is characterized by comprising a compressor for compressing a refrigerant as a fluid, a first heat exchanger functioning as a condenser in a cooling mode, a second heat exchanger functioning as an evaporator in a cooling mode, an expansion mechanism for expanding the refrigerant between the first heat exchanger and the second heat exchanger and reducing the pressure, and the switching valve.

According to this refrigeration cycle system, since the above-described switching valve is provided, the strength against external force can be improved and the size can be suppressed for the switching valve.

The effects of the invention are as follows.

According to the switching valve and the refrigeration cycle system of the present invention, the strength against external force can be improved and the size can be suppressed.

Drawings

Fig. 1 is a two-view showing the overall configuration of a switching valve of an embodiment.

Fig. 2 is a schematic view showing a refrigeration cycle system having the switching valve shown in fig. 1.

Fig. 3 is a cross-sectional view showing the pilot driving part in the switching valve of fig. 1 in a section along line V11-V11 in fig. 1.

Fig. 4 is a cross-sectional view showing the pilot driving portion shown in fig. 3 in a cross-section taken along line V12-V12 in fig. 3.

Fig. 5 is a plan view of the valve seat member as seen from the valve seat side and a side view of the valve seat member as seen from the connection side of the tubule, and is an external view of the valve seat member as seen in cross-section in fig. 3 and 4.

Fig. 6 is a sectional view taken along line V13-V13 in fig. 5.

Fig. 7 is a sectional view taken along line V14-V14 in fig. 5.

Fig. 8 is a sectional view taken along line V15-V15 in fig. 5.

Fig. 9 is a view showing a fixing portion of the valve seat member and the outer wall of the main casing of the switching valve main body in an enlarged view of a region a11 in fig. 4.

Fig. 10 is a schematic diagram showing the setting of the length in the valve seat axial direction with respect to the valve seat member to which the pilot body is coupled to the switching valve body.

Fig. 11 is a diagram showing a modification of the protruding direction of the joint shown in fig. 10.

In the figure:

1-refrigeration cycle, 1 a-compressor, 1 b-outdoor heat exchanger (first heat exchanger), 1C-indoor heat exchanger (second heat exchanger), 1D-throttle device (expansion mechanism), 10-switching valve, 11-switching valve main body, 11 a-main valve chamber, 11 b-first working chamber, 11C-second working chamber, 12-1-pilot driving portion, 13S-low pressure joint tubule, 13L-first housing tubule, 13R-second housing tubule, 15C-C joint pipe, 15D-D joint pipe, 15E-E joint pipe, 15S-S joint pipe, 111-main housing, 111 a-main body through hole, 111 b-receiving recess, 111 b-1-main body side joint plane, 111 b-2-inner peripheral surface, 112-main valve, 113, 122 a-valve seat, 114L, 114R-piston, 115-joint plate, 116-valve body, 116a, 121 b-1-bowl-shaped recess, 121-pilot body, 121 a-sub-housing, 121 a-1-sub-valve, 121 b-sub-spool, 121C-coil part, 121D-1, 121D-3-first part, 121D-2, 121D-4-second part, 121E-1-joint part, 121 f-1-frame part, 122-valve seat member, 122 b-inlet part, 122C-fixed part, 122C-1-valve seat side joint plane, 122C-2-outer circumferential surface, 122D-valve seat through hole, 122D-1-first part, 122D-2-second part, 122D-3, 122 g-coil part, 122E-flat surface, 122 f-pillar part, 122S-low pressure communication hole, 122S-1-low pressure orthogonal hole, 122S-2-low pressure axis hole, 122L-first housing communication hole, 122L-1-first housing orthogonal hole, 122L-2-first housing axial hole, 122R-second housing communication hole, 122R-1-second housing orthogonal hole, 122R-2-second housing axial hole, 123-filter, D11-primary axial direction, D12-secondary axial direction, D13-secondary axial direction, D14-valve seat axial direction, D15-protruding direction, L11-first length, L12-1-second length, L13-1-third length, R11-lead, X11-primary sliding axis, X12-secondary sliding axis, X13-valve seat axis.

Detailed Description

A switching valve and a refrigeration cycle according to an embodiment will be described below with reference to fig. 1 to 10.

Fig. 1 is a two-view showing the overall configuration of a switching valve of an embodiment. Fig. 2 is a schematic diagram showing a refrigeration cycle system including the switching valve shown in fig. 1.

The switching valve 10 of the present embodiment is a four-way switching valve for switching the communication states of four joint pipes, namely, a D joint pipe 15D, an E joint pipe 15E, an S joint pipe 15S, and a C joint pipe 15C, which will be described in detail below. The switching valve 10 switches the communication state of the four joint pipes to switch the flow path of the refrigerant in the refrigeration cycle 1 shown in fig. 2. The switching valve 10 includes a switching valve body 11, a pilot drive unit 12, a first housing tubule 13L, a second housing tubule 13R, and a low-pressure joint tubule 13s.

The switching valve body 11 incorporates a main spool 112 in the main casing 111, and switches the flow path state by receiving the sliding of the main spool 112. The switching of the flow path state in the present embodiment is a switching of a flow path in which one flow path is changed to another flow path among a plurality of flow paths configured by four joint pipes. The main case 111 is a stainless steel cylindrical member having both ends sealed, and a stainless steel D-joint pipe 15D, an E-joint pipe 15E, an S-joint pipe 15S, and a C-joint pipe 15C are connected to the peripheral wall thereof so as to communicate with the inside. A main spool 112 and a valve seat 113 are provided in the main housing 111.

The main spool valve 112 includes a pair of pistons 114L and 114R, a connecting plate 115, and a spool 116. The main spool 112 is provided inside the main housing 111, and communicates two pairs of joint pipes among the plurality of joint pipes, and switches the joint pipes to be communicated by sliding movement.

The pair of pistons 114L, 114R are disposed opposite to each other, and can reciprocate while pressing the packing against the inner peripheral surface of the main casing 111. Thus, the interior of the main housing 111 is partitioned into a high-pressure main valve chamber 11a in the center portion, a first working chamber 11b and a second working chamber 11c on both sides of the main valve chamber 11a by the two pistons 114L and 114R.

The connecting plate 115 is formed of a metal plate, and the connecting plate 115 is disposed between the pistons 114L and 114R so as to be arranged on the main sliding axis X11 of the main housing 111, and holds the valve element 116 at the center thereof. The valve body 116 slides on the valve seat 113 in conjunction with the connecting plate 115 when the pistons 114L and 114R move, and stops when the pistons 114L and 114R reach predetermined limit positions at the left and right ends of the main housing 111.

The valve seat 113 is disposed in the middle portion of the main casing 111, and a D joint pipe 15D as a high-pressure pipe that is opened in the main casing 111 is attached at a position facing the valve seat 113 in the middle portion of the main casing 111. The valve seat 113 is provided with an E-joint pipe 15E and a C-joint pipe 15C as a pair of pipes and an S-joint pipe 15S as a low-pressure pipe so as to be aligned in the direction of the main sliding axis X11 of the main housing 111. A bowl-shaped recess 116a is formed on the inner side of the valve body 116. The valve body 116 communicates the S-joint pipe 15S with the E-joint pipe 15E through the bowl-shaped recess 116a at the left end position in fig. 1. At this time, the C-joint pipe 15C communicates with the D-joint pipe 15D via the main valve chamber 11 a. The spool 116 moves to the right end position of the main spool 112 in fig. 1, and communicates the S-joint pipe 15S with the C-joint pipe 15C through the bowl-shaped recess 116a. At this time, the E joint pipe 15E communicates with the D joint pipe 15D via the main valve chamber 11 a.

In the refrigeration cycle 1 shown in fig. 2, the D-joint pipe 15D is a high-pressure pipe connected to the discharge port of the compressor 1a, and the S-joint pipe 15S is a low-pressure pipe connected to the suction port of the compressor 1 a. The C-joint pipe 15C is a pipe connected to the outdoor heat exchanger 1b (first heat exchanger), and the E-joint pipe 15E is a pipe connected to the indoor heat exchanger 1C (second heat exchanger). The outdoor heat exchanger 1b and the indoor heat exchanger 1c are connected via a throttle device 1d (expansion mechanism). The refrigeration cycle 1 is configured by a flow path including the C-joint pipe 15C, the outdoor heat exchanger 1b, the throttle device 1D, the indoor heat exchanger 1C, and the E-joint pipe 15E, and a flow path including the S-joint pipe 15S, the compressor 1a, and the D-joint pipe 15D.

The pilot driving unit 12 is connected to the main casing 111. The pilot driving unit 12 causes the driving fluid to flow into a pair of spaces, that is, both the first working chamber 11b and the second working chamber 11c, of the main spool 112 in the main shaft direction D11 in the main housing 111, and causes the main spool 112 to slide in the main shaft direction D11. In the present embodiment, the pilot driving unit 12 causes the fluid of the D-joint pipe 15D, which is a high-pressure pipe, to flow into one of the first working chamber 11b and the second working chamber 11c, and causes the fluid of the S-joint pipe 15S, which is a low-pressure pipe, to flow into the other, thereby slidably moving the main spool 112.

The pilot driving portion 12 is connected to the S-joint pipe 15S, which is a low-pressure pipe, through the low-pressure joint tubule 13S, and the pilot driving portion 12 is connected to the first working chamber 11b through the first housing tubule 13L. The pilot driving portion 12 and the second working chamber 11c are connected to each other through a second casing tubule 13R. The low-pressure joint tubule 13s, the first casing tubule 13L, and the second casing tubule 13R are each made of stainless steel. The pilot driving portion 12 is connected to the main valve chamber 11a communicating with the D joint pipe 15D, which is a high-pressure joint pipe, through a stainless valve seat member 122 in the pilot driving portion 12, which will be described in detail below.

The pilot driving unit 12 is a solenoid valve having the same structure as the switching valve 10, and switches the flow path of the driving fluid by sliding the sub spool in the inside by energization. The sub spool valve switches the communication destination of the low pressure joint tubule 13S communicating with the S-joint pipe 15S as the low pressure pipe as follows. That is, the pilot driving unit 12 switches the communication destination of the low pressure joint tubule 13s by the first casing tubule 13L connected to the first working chamber 11b of the switching valve 10 and the second casing tubule 13R connected to the second working chamber 11 c. At the same time, the communication destination of the high-pressure main valve chamber 11a is switched by the first housing tubule 13L and the second housing tubule 13R. Thereby, a pressure difference is generated between the pressure in the first working chamber 11b and the pressure in the second working chamber 11c, and the main spool 112 is slid in the main shaft direction D11 from the high pressure side to the low pressure side by the pressure difference. Then, by this sliding movement, the position of the valve body 116 in the main spool 112 is switched to switch the flow path of the refrigerant in the refrigeration cycle 1.

With the above configuration, the high-pressure refrigerant compressed by the compressor 1a flows into the main valve chamber 11a from the D-joint pipe 15D, and in the cooling operation state (in the cooling mode), the high-pressure refrigerant flows into the outdoor heat exchanger 1b from the C-joint pipe 15C. In the heating operation state (heating mode) after the position of the valve element 116 is switched, the high-pressure refrigerant flows into the indoor heat exchanger 1c from the E-joint pipe 15E. That is, during the cooling operation, the refrigerant discharged from the compressor 1a circulates in the order of D-C-15C-1 b, 1D, 1C-15E. In this case, the outdoor heat exchanger 1b functions as a condenser (condenser), and the indoor heat exchanger 1c functions as an evaporator (evaporator), and performs cooling. The expansion device 1d expands and decompresses the refrigerant between the outdoor heat exchanger 1b and the indoor heat exchanger 1 c. In the heating operation, the refrigerant circulates in the opposite direction, the indoor heat exchanger 1c functions as a condenser, and the outdoor heat exchanger 1b functions as an evaporator, thereby heating.

Here, in the present embodiment, the pilot driving portion 12 has the following structure.

Fig. 3 is a cross-sectional view showing the pilot driving part in the switching valve of fig. 1 in a section along line V11-V11 in fig. 1. Fig. 4 is a cross-sectional view of the pilot driving unit shown in fig. 3, taken along the line V12-V12 in fig. 3.

The pilot driving portion 12 is a solenoid valve as described above, and includes the pilot body 121 and the valve seat member 122. The pilot body 121 includes a sub-housing 121a, a sub-spool 121b, a plunger 121c, a coil portion 121d, and a joint portion 121e of the lead R11.

The pilot body 121 incorporates a sub spool 121b, and slides the sub spool 121b to switch the flow path state of the driving fluid and slide the main spool 112. In the pilot body 121, a plurality of flow paths for the driving fluid are formed through three tubules, that is, the first casing tubule 13L, the second casing tubule 13R, and the low-pressure joint tubule 13s, and the valve seat through-holes 122d described below in the valve seat member 122. The switching of the flow path state in the pilot body 121 is a switching of a flow path in which one flow path is changed to another flow path among the plurality of flow paths.

The sub-housing 121a of the pilot body 121 is a cylindrical housing made of stainless steel, both ends of which are sealed, and the sub-spool 121b and the plunger 121c are incorporated therein. The peripheral wall of the sub-housing 121a serves as a plunger tube 121a-1 that restricts movement of the plunger 121c to sliding in the counter shaft direction D12 along a sub-sliding axis X12 that coincides with the axis of the sub-housing 121 a.

The sub spool valve 121b has a bowl-shaped recess 121b-1 formed inside thereof, and the low-pressure-side tubule 13s and the first casing tubule 13L communicate with each other through the bowl-shaped recess 121b-1 at the left end position of fig. 3 shown in fig. 3. At this time, the second housing tubule 13R communicates with the high-pressure main valve chamber 11a of the switching valve main body 11 via the sub valve chamber 121c-1 provided in the plunger 121 c. When the sub spool valve 121b slides rightward in fig. 3, the communication destination of the low-pressure joint tubule 13s is switched to the second housing tubule 13R, and the communication destination of the first housing tubule 13L is switched to the high-pressure main valve chamber 11 a.

Here, in the present embodiment, the bowl-shaped recess 121b-1 of the sub spool valve 121b is a hemispherical recess. Unlike the hemispherical shape, in a spool valve provided with a bowl-shaped recess having an oblong shape, for example, a linear portion exists at a part of the periphery of the bowl-shaped recess, but tensile stress is applied to the linear portion when the spool valve receives pressure from surrounding driving fluid. Depending on the size of the spool, the magnitude of the pressure applied from the driving fluid, etc., there is a possibility that the tensile stress applied to the straight portion becomes excessive. In contrast, according to the sub spool valve 121b provided with the hemispherical bowl-shaped concave portion 121b-1 in the present embodiment, since the tensile stress described above is suppressed, the pressure resistance of the sub spool valve 121b can be improved. Further, it is possible to reduce the wall thickness of the sub spool valve 121b in anticipation of such an improvement in pressure resistance, and as a result, the movement amount of the sub spool valve 121b can be suppressed.

The plunger 121c is substantially cylindrical, and a portion to the right in fig. 3 is a magnet slidably accommodated in the plunger tube 121a-1 in a posture extending in the counter shaft direction D12. The plunger 121c holds the sub spool valve 121b at one end portion of the plunger tube 121a-1 on the valve seat member 122 side in the counter shaft direction D12. At the one end, the sub spool valve 121b is biased toward the valve seat member 122 by the spring 121c-2 in the sub shaft orthogonal direction D13 orthogonal to the sub spool axis X12. The plunger 121c is biased in the auxiliary shaft direction D12 by the spring 121c-3 from the side opposite to the valve seat member 122 toward the valve seat member 122. By the biasing force in the auxiliary shaft direction D12, the auxiliary spool 121b is positioned at an initial position where the low-pressure joint tubule 13s communicates with the first casing tubule 13L.

The coil portion 121d is wound around the outer periphery of the plunger tube 121a-1, and a magnetic force is applied to the magnet portion of the plunger 121c by supplying a current thereto, thereby generating an attractive force having a polarity opposite to that of the magnet portion. The magnetic force from the coil portion 121D causes the plunger 121c to slide along the sub-sliding axis X12 in the sub-axis direction D12 toward the opposite side of the valve seat member 122 against the urging force of the spring 121 c-3. By this sliding, the sub spool 121b is positioned at a sliding position that communicates the low pressure joint tubule 13s with the second casing tubule 13R.

The bonding portion 121e is a portion where the lead wire R11 that supplies current to the coil portion 121d is bonded to the coil portion 121 d. The joint portion 121e is provided so as to avoid interference with the switching valve body 11 and so as to protrude from the coil portion 121D in the layshaft orthogonal direction D13.

The valve seat member 122 constitutes a valve seat 122a that slides against the sub spool 121b in the pilot body 121 having the structure described above, and serves as a member for connecting the pilot body 121 to the switching valve body 11. The valve seat member 122 is connected to three tubules, i.e., the low-pressure joint tubule 13s, the first housing tubule 13L, and the second housing tubule 13R.

Fig. 5 is a plan view from the valve seat side and a side view from the connection side of the tubule, showing an external view of the valve seat member shown in cross-section in fig. 3 and 4. Fig. 6 is a sectional view taken along line V13-V13 in fig. 5, fig. 7 is a sectional view taken along line V14-V14 in fig. 5, and fig. 8 is a sectional view taken along line V15-V15 in fig. 5. The valve seat member 122 will be described below with reference to fig. 3 and 4 and fig. 5 to 8.

The valve seat member 122 is fixed to the switching valve body 11 in a part thereof, and the other part thereof enters the pilot body 121 to constitute a valve seat 122a. Specifically, the valve seat member 122 is a substantially cylindrical solid body, one end of which is an entry portion 122b into the pilot body 121 to constitute a valve seat 122a, and the other end of which is a fixing portion 122c fixed to the switching valve body 11. The valve seat 122a has a band-shaped range in which sliding friction is generated by the sub spool 121b at the end face of the inlet portion 122 b.

Further, the low-pressure joint tubule 13s, the first casing tubule 13L, and the second casing tubule 13R are connected to the circumferential surface of the valve seat member 122. As described above, three tubule communication holes, that is, the low pressure communication hole 122s, the first housing communication hole 122L, and the second housing communication hole 122R, are formed in the solid valve seat member 122.

The low pressure communication hole 122s is connected to the low pressure joint tubule 13s, and forms a low pressure driving fluid flow path together with the low pressure joint tubule 13 s. The low pressure communication hole 122s is formed by a low pressure orthogonal hole 122s-1 and a low pressure axial hole 122 s-2. The low-pressure orthogonal hole 122s-1 opens in a direction orthogonal to the valve seat axis X13, which is the central axis of the valve seat member 122. The low-pressure orthogonal hole 122s-1 is a hole in which the diameter of the back side is the same as the inner diameter of the low-pressure-joint tubule 13s, and the diameter of the opening side is slightly larger than the outer diameter of the low-pressure-joint tubule 13s, so that the low-pressure-joint tubule 13s is inserted. The low-pressure axis hole 122s-2 is a hole which is opened along the valve seat axis X13 and has a smaller diameter than the low-pressure orthogonal hole 122s-1, and one end is connected to the low-pressure orthogonal hole 122s-1 and the other end is opened in the valve seat 122 a.

The first housing communication hole 122L is connected to the first housing tubule 13L, and forms a flow path of the driving fluid toward the first working chamber 11b of the switching valve body 11 together with the first housing tubule 13L. The first housing communication hole 122L is formed by a first housing orthogonal hole 122L-1 and a first housing axial hole 122L-2. The first housing orthogonal hole 122L-1 is opened in a direction orthogonal to the valve seat axis X13. The first casing orthogonal hole 122L-1 has a diameter on the back side equal to the inner diameter of the first casing joint tubule 13L, and a diameter on the opening side slightly larger than the outer diameter of the first casing joint tubule 13L, and is formed so that the first casing joint tubule 13L is inserted. The first housing axis hole 122L-2 is a hole which is opened along the valve seat axis X13 and has a smaller diameter than the first housing orthogonal hole 122L-1, and one end is connected to the first housing orthogonal hole 122L-1 and the other end is opened at the valve seat 122 a.

The second housing communication hole 122R is connected to the second housing tubule 13R, and forms a flow path of the driving fluid toward the second working chamber 11c of the switching valve body 11 together with the second housing tubule 13R. The second housing communication hole 122R is formed by a second housing orthogonal hole 122R-1 and a second housing axial hole 122R-2. The second housing orthogonal hole 122R-1 is opened in a direction orthogonal to the valve seat axis X13. The second casing orthogonal hole 122R-1 has a diameter on the back side equal to the inner diameter of the second casing joint tubule 13R and a diameter on the opening side slightly larger than the outer diameter of the second casing joint tubule 13R, and is formed so as to receive the second casing joint tubule 13R. The second housing axis hole 122R-2 is a hole which is opened along the valve seat axis X13 and has a smaller diameter than the second housing orthogonal hole 122R-1, and one end is connected to the second housing orthogonal hole 122R-1 and the other end is opened at the valve seat 122 a.

In the valve seat 122a, the low-pressure axis hole 122s-2, the first housing axis hole 122L-2, and the second housing axis hole 122R-2 are opened in a manner aligned in a straight line in the valve seat member 122 in the radial direction along the counter axis direction D12. The low-pressure axis hole 122s-2 opens at the center of the substantially circular end surface including the valve seat 122a, and the first housing axis hole 122L-2 and the second housing axis hole 122R-2 open so as to sandwich the opening of the low-pressure axis hole 122 s-2.

Further, a valve seat through hole 122d is formed in the solid valve seat member 122, from a fixed portion 122c penetrating the switching valve body 11 to an entry portion 122b entering the pilot body 121. The valve seat through hole 122d connects the high-pressure main valve chamber 11a of the switching valve body 11 with the sub valve chamber 121c-1 of the pilot body 121 to form a high-pressure driving fluid flow path.

At this time, the valve seat member 122 of the pilot driving portion 12 is fixed to the outer wall of the main housing 111 in the switching valve main body 11. Further, a main body through hole 111a that communicates with the valve seat through hole 122d and forms a high-pressure driving fluid flow path together with the valve seat through hole 122d is formed in the outer wall of the main body 111. As shown in fig. 5 and 8, the valve seat through hole 122d is opened at the side of the inlet portion 122b so as to be offset from the valve seat 122 a. Accordingly, regardless of the sliding position of the sub spool 121b, the main valve chamber 11a of the switching valve main body 11 and the sub valve chamber 121c-1 of the pilot main body 121 are always in communication with each other via the valve seat through hole 122d and the main body through hole 111a.

In the present embodiment, the valve seat through-hole 122d is constituted by a first hole 122d-1 on the side of the inlet portion 122b and a second hole 122d-2 having a larger diameter and a shorter diameter than the first hole 122d-1 on the side of the fixed portion 122 c. A step 122d-3 is provided at the boundary between the first hole 122d-1 and the second hole 122d-2, extending along the radial direction as an annular plane, and connecting the two. Further, a filter 123 for removing foreign matter from the driving fluid flowing through the valve seat through hole 122d is housed in the second hole 122 d-2.

The pilot driving portion 12 is connected to the switching valve body 11 via the valve seat member 122 described above as follows. First, the pilot driving portion 12 is attached to the switching valve body 11 in a configuration in which the main sliding axis X11 of the main casing 111 and the sub sliding axis X12 of the sub casing 121a extend along each other. In the present embodiment, as shown in fig. 1, the switching valve body 11 is coupled to the four joint pipes, i.e., the D joint pipe 15D, the E joint pipe 15E, the S joint pipe 15S, and the C joint pipe 15C, with their respective axes included in the single plane P11. Then, the pilot driving portion 12 is disposed with respect to the switching valve main body 11 so that the main spool 112 and the sub spool 121b slide in the main shaft direction D11 and the sub shaft direction D12 along the in-plane direction of the one plane P11.

In the present embodiment, the connection between the low-pressure joint tubule 13s, the first casing tubule 13L, and the second casing tubule 13R and the circumferential surface of the valve seat member 122 is as follows. That is, in the present embodiment, the valve seat member 122 has a D-shaped cut shape, that is, a part of the peripheral surface becomes a flat surface 122e extending in the valve seat axial direction D14 along the valve seat axis X13. The low-pressure orthogonal hole 122s-1, the first housing orthogonal hole 122L-1, and the second housing orthogonal hole 122R-1 are opened in the flat surface 122e of the D-shaped cut shape. The pressure-bonding tubule 13s, the first casing tubule 13L, and the second casing tubule 13R are inserted into holes opened in the flat surface 122e, and are connected by brazing.

In the present embodiment, the pillar portion 122f is positioned between the pilot body 121 and the switching valve body 11 in the valve seat member 122, and is fixed to the switching valve body 11 at the fixing portion 122c to support the pilot body 121, and the pillar portion 122f is thicker than the inlet portion 122 b. Further, a step 122g, which is a flat surface extending in the minor axis orthogonal direction D13, is formed at the boundary between the pillar portion 122f and the entrance portion 122 b. The step 122g is a flat surface having a C-shape, which is formed by cutting a part of the ring by the D-shaped cutting. As shown in fig. 3 and 4, the step 122g is engaged with the outer peripheral surface of the sub-housing 121a of the pilot body 121, and the inlet portion 122b of the valve seat member 122 is fixed to the pilot body 121 by brazing.

In the present embodiment, the valve seat member 122 and the outer wall of the main casing 111 of the switching valve body 11 are fixed as follows.

Fig. 9 is a view showing a fixing portion between the valve seat member and the outer wall of the main casing of the switching valve main body in an enlarged view of a region a11 in fig. 4.

As shown in fig. 9, the fixed portion 122c of the valve seat member 122 is formed with a valve seat side engagement plane 122c-1 as an end surface that contacts and engages with the outer wall surface of the main casing 111 in the switching valve main body 11. On the other hand, in the outer wall of the main casing 111, a receiving recess 111b is formed which receives the fixing portion 122c and whose main body side engagement plane 111b-1 in surface contact with the valve seat side engagement plane 122c-1 becomes a bottom surface. The fixing portion 122c is fixed to the outer wall of the main casing 111 by brazing in a state in which a part of the outer peripheral surface 122c-2 surrounding the valve seat side engagement plane 122c-1 in the fixing portion 122c is engaged so as to be in contact with a part of the inner peripheral surface 111b-2 of the receiving recess 111b.

The main body through hole 111a opens in a main body side engagement plane 111 b-1. Here, in the present embodiment, the body through hole 111a is opened at a position offset from and communicating with the second hole portion 122d-2 of the valve seat through hole 122d opening in the valve seat side engagement plane 122 c-1. Further, the movement of the filter 123 accommodated in the second hole 122d-2 toward the first hole 122d-1 is regulated by the step 122d-3 in the valve seat through hole 122 d. Further, the filter 123 is restricted from moving toward the body through hole 111a side by the peripheral edge portion of the body through hole 111a in the body side engagement plane 111 b-1.

In the present embodiment, the length in the valve seat axis direction D14 with respect to the valve seat member 122 to which the pilot body 121 is coupled to the switching valve body 11 is set as follows.

Fig. 10 is a schematic diagram showing the setting of the length in the valve seat axial direction with respect to the valve seat member to which the pilot body is coupled to the switching valve body. Fig. 10 is a schematic side view of the switching valve body 11 and the pilot driving portion 12 as viewed from the direction of arrow V16 in fig. 1, and a cross-sectional view taken along line V17-V17 in fig. 10.

As described above, the pilot body 121 of the pilot driving portion 12 is provided with the coil portion 121d for sliding the plunger 121c and the joint portion 121e of the lead wire R11. The coil portion 121d is housed in the frame portion 121f, and the joint portion 121e is attached to the frame portion 121f. The coil portion 121d is configured to have a first portion 121d-1 provided with a joint portion 121e and a second portion 121d-2 other than the first portion 121 d-1. In the first portion 121d-1, the winding wire of the coil portion 121d is led out to the joint portion 121e, and the leading end of the winding wire is connected to the lead R11 at the joint portion 121e. In the present embodiment, the joint portion 121e is provided so as to protrude upward in the drawing from the coil portion 121D in the direction of the auxiliary shaft orthogonal direction D13 in the same direction as the standing direction of the valve seat member 122, away from the coil portion 121D. A portion of the coil portion 121d on the upper side in the drawing, which is the joint portion 121e side, is the first portion 121d-1, and a portion of the coil portion 121d on the lower side in the drawing, which is the switching valve main body 11 side, is the second portion 121d-2.

In the present embodiment, the first length L11 of the valve seat member 122 is shorter than the second length L12 of the joint portion 121e and longer than the third length L13 of the coil portion 121 d. The first length L11 related to the valve seat member 122 is a length from the sub-sliding axis X12 to a valve seat-side engagement plane 122c-1 in the valve seat member 122 as a fixed end with the switching valve main body 11. The second length L12 related to the joint 121e is a length from the sliding axis X12 to the protruding end of the joint 121 e. The third length L13 related to the coil portion 121d is a length from the sliding axis X12 to the outer surface of the second portion 121d-2 in the coil portion 121 d.

In the present embodiment, the protruding direction of the joint portion 121e is a direction protruding upward in the drawing away from the coil portion 121D in the direction same as the standing direction of the valve seat member 122 in the auxiliary axis orthogonal direction D13. However, the protrusion of the joint portion 121e is not limited to such an upward protrusion, and may be a protrusion as in a modification example shown below.

Fig. 11 is a diagram showing a modification of the protruding direction of the joint shown in fig. 10. In this fig. 11, a side view identical to fig. 10 and a sectional view along the line V18-V18 in fig. 11 are shown. In fig. 11, the same reference numerals as those in fig. 10 are given to components necessary for the description of the same components as those in fig. 10, and the repetitive description of the same components will be omitted.

In the pilot driving portion 12-1 of the modification shown in fig. 11, the protruding direction of the joint portion 121e-1 is a direction deviated by 90 ° about the sub-sliding axis X12 from the protruding direction of the joint portion 121e shown in fig. 10. That is, in the present modification, the joint portion 121e-1 protrudes in the protruding direction D15 toward the right in the drawing, which is orthogonal to the sub-sliding axis X12 and to the standing direction of the valve seat member 122 and away from the coil portion 121D. The joint portion 121e-1 is received, and the frame portion 121f-1 is opened to the right in the drawing as the protruding side of the joint portion 121 e-1. The first portion 121d-3 of the coil portion 121d where the joint portion 121e-1 is provided is a right-hand portion in the drawing, and the other second portion 121d-4 is a left-hand portion in the drawing. However, in this modification, the first length L11 from the sliding axis X12 to the valve seat side engagement plane 122c-1 is also shorter than the second length L12-1 to the protruding end of the engagement portion 121 e-1. The first length L11 is longer than the third length L13-1 extending to the outer surface of the second portion 121d-4 of the coil portion 121 d.

According to the above-described embodiment, the switching valve 10 according to the modification, and the refrigeration cycle system 1, the following effects can be obtained. That is, according to the present embodiment and the modification, the valve seat member 122 constituting the pilot driving portions 12, 12-1 is directly fixed to the switching valve body 11. Therefore, the strength against external force can be improved as compared with the case where the pilot driving portion is coupled to the switching valve main body using the bracket formed of the metal plate. Further, since the bracket is not required, the number of members is suppressed, and accordingly the size of the switching valve 10 can be suppressed.

Here, in the present embodiment and the modification, the valve seat member 122 is fixed to the outer wall of the main housing 111 so that the main valve chamber 11a and the valve seat through-hole 122d are connected to each other through the main body through-hole 111 a. According to this configuration, the high-pressure fluid flow path connecting the main valve chamber 11a to the pilot driving portions 12, 12-1 is constituted by the valve seat through hole 122d in the valve seat member 122 and the main body through hole 111a in the switching valve main body 11. This can further improve the strength by minimizing the flow path of the high-pressure fluid, compared with the case where the main valve chamber 11a and the pilot driving portion 12 are connected by the high-pressure tubule. Further, the size of the switching valve 10 can be further suppressed in accordance with the fact that the fine tube for high pressure is not required.

In the present embodiment and the modification, the pilot driving units 12 and 12-1 are attached to the switching valve body 11 in a configuration in which the main sliding axis X11 and the sub sliding axis X12 extend along each other. According to this configuration, the coil portion 121d of the pilot driving portion 12, 12-1 approaches the switching valve body 11, and therefore the center of gravity of the pilot driving portion 12, 12-1 approaches the switching valve body 11, compared to an arrangement in which the main sliding axis and the sub sliding axis are orthogonal to each other. As a result, the size of the switching valve 10 can be further suppressed in the direction orthogonal to the two sliding axes. Further, since the center of gravity of the pilot driving portions 12, 12-1 is close to the switching valve main body 11 side, the strength of the switching valve 10 against external force can be further improved.

In the present embodiment and the modification, the switching valve main body 11, the pilot driving portion 12, and the four joint pipes are disposed so that each spool slides in the in-plane direction of the one plane P11 including the axis of each joint pipe. According to this structure, the switching valve 10 is thinned in the out-of-plane direction of the one plane P11. That is, according to the above-described structure, the size of the switching valve 10 can be further suppressed.

In the present embodiment and the modification, the low-pressure joint tubule 13s, the first casing tubule 13L, and the second casing tubule 13R are connected to the flat surface 122e on the circumferential surface of the valve seat member 122. According to this configuration, when the tubules are connected to the valve seat member 122 by brazing, the annular solder can be disposed on the flat surface 122e of the valve seat member 122, so that workability related to brazing can be improved.

In the present embodiment and the modification, the first length L11 from the sub-sliding axis X12 to the valve seat side engagement plane 122c-1 is shorter than the second lengths L12, L12-1 from the protruding ends of the engagement portions 121e, 121 e-1. The first length L11 is longer than the third lengths L13 and L13-1 extending to the outer surfaces of the second portions 121d-2 and 121d-4 of the coil portions 121d and 121 d-1. According to this configuration, the size of the valve seat member 122 is optimized to be the minimum necessary by the definition of the first length L11, and the center of gravity of the pilot driving portions 12, 12-1 approaches the switching valve main body 11 side. This can further improve the strength of the switching valve 10 against external force and further suppress the size of the switching valve 10.

In the present embodiment and the modification, the entry portion 122b is fixed to the pilot body 121 in a state where the step 122g between the pillar portion 122f thicker than the entry portion 122b of the valve seat member 122 is engaged so as to contact the outer peripheral surface of the pilot body 121. According to this structure, since the pillar portion 122f supporting the pilot body 121 in the valve seat member 122 is thicker and more rigid than the entering portion 122b, the strength of the switching valve 10 against external force can be further improved. Further, since the stepped portion 122g is engaged so as to contact the outer peripheral surface of the pilot body 121, when the valve seat member 122 is fixed to the pilot body 121, the valve seat member 122 can be positioned with respect to the pilot body 121 with good workability.

In the present embodiment and the modification, the low pressure communication hole 122s, the first case communication hole 122L, the second case communication hole 122R, and the valve seat through hole 122d are formed in the solid body in the valve seat member 122. According to this structure, since the valve seat member 122 is formed of a solid body and has high rigidity, the strength of the switching valve 10 against external force can be further improved.

In the present embodiment and the modification, the fixing portion 122c of the valve seat member 122 is fixed to the outer wall of the main casing 111 so that the valve seat side engagement plane 122c-1 is in surface contact with the main body side engagement plane 111b-1 which is the bottom surface of the receiving recess 111 b. Further, a part of the outer peripheral surface 122c-2 of the fixing portion 122c is engaged and fixed so as to be in contact with a part of the inner peripheral surface 111b-2 of the receiving recess 111 b. According to this configuration, when the valve seat member 122 is connected to the switching valve body 11 by brazing, the brazing can be performed in a stable state in which the valve seat side engagement plane 122c-1 is in surface contact with the body side engagement plane 111 b-1. Further, since the fixing portion 122c of the valve seat member 122 can be fixed in a state of being engaged with the receiving recess 111b of the main housing 111, the strength of the switching valve 10 against external force can be further improved.

In the present embodiment and the modification, a filter 123 for removing foreign matter is housed in the large-diameter second hole 122d-2 in the valve seat through hole 122 d. Further, the movement of the filter 123 inside the second hole 122d-2 is regulated by the step 122d-3 with the first hole 122d-1 of small diameter and the peripheral edge of the main body through hole 111a in the outer wall of the main body case 111. According to this configuration, the filter 123 for removing foreign matter is housed in the valve seat through hole 122d while restricting the movement of the driving fluid in the flow direction. This effectively prevents the filter 123 from being pushed by the driving fluid and falling off, and enables foreign matter removal. Further, since the filter 123 is housed in the valve seat through hole 122d where a margin is easily provided in space, the size of the switching valve 10 related to the filter installation can be suppressed as compared with a case where a part of the tubule is enlarged in the tubule to house the filter. In addition, according to the movement restriction of the filter 123 by the difference between the diameter of the body through hole 111a and the stepped structure inside the valve seat through hole 122d, the number of members can be suppressed and the cost can be reduced as compared with the case where, for example, a stopper for other members is provided for restricting the movement.

The embodiments and modifications described above are merely representative modes of the present invention, and the present invention is not limited thereto. That is, various modifications can be made without departing from the gist of the present invention. According to such a modification, it is needless to say that the present invention is also included in the scope of the present invention as long as the present invention further includes the switching valve and the refrigeration cycle system.

For example, in the above-described embodiment and modification, the switching valve 10 as the four-way switching valve for switching the communication state of the four joint pipes is shown as an example of the switching valve. However, the switching valve is not limited to the four-way switching valve. The switching valve may be a three-way switching valve in which a plurality of joint pipes are connected by a slide valve body, for example, a joint pipe to be connected when a pair of three joint pipes are connected may be switched by a slide valve body. Alternatively, a two-way switching valve may be used in which a slide valve body is used to open and close the two joint pipes. The number of joint pipes in the switching valve, the switching object of the communication state, and the like can be appropriately set according to the application object of the switching valve, and the like.

In the above-described embodiment and modification, the columnar valve seat member 122 having one end serving as the inlet portion 122b into the pilot body 121 and the other end serving as the fixing portion 122c with the switching valve body 11 is illustrated as an example of the valve seat member. However, the valve seat member is not limited to such a columnar member, and may be fixed so that a part thereof is fixed to the switching valve body and the other part thereof enters the pilot body to constitute the valve seat, and the specific shape thereof is not limited.

In the above-described embodiment and modification, the switching valve 10 in which the main valve chamber 11a and the sub valve chamber 121c-1 of the pilot body 121 are connected via the valve seat through hole 122d and the body through hole 111a is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and may be a valve in which the first working chamber, the second working chamber, and the valve seat are connected through the valve seat through-hole and the main body through-hole. However, the valve seat through-hole 122d and the body through-hole 111a constitute a high-pressure fluid flow path connecting the main valve chamber 11a and the sub valve chamber 121c-1, so that the strength of the switching valve 10 can be further improved, and the size can be further suppressed.

In the above-described embodiments and modifications, the switching valve 10 in which the pilot driving portions 12 and 12-1 are attached to the switching valve body 11 in a configuration in which the sliding axes extend along each other is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and any arrangement of the pilot driving portion and the switching valve main body may be used. However, according to the arrangement in which the two sliding axes are along each other, the size of the switching valve 10 can be further suppressed, and the strength of the switching valve 10 against external force can be further improved, as described above.

In the above-described embodiments and modifications, the switching valve 10 in which the main spool 112 and the sub spool 121b slide in the in-plane direction of the single plane P11 including the axes of the plurality of joint pipes is shown as an example of the switching valve. However, the switching valve is not limited to this, and any arrangement may be adopted in which the sliding direction of the main spool and the sub spool is arranged to face the axis of each of the plurality of joint pipes. However, according to the arrangement in which the main spool 112 and the sub spool 121b are slid in the out-of-plane direction of the one plane P11, the size of the switching valve 10 can be further suppressed by thinning, as described above.

In the above-described embodiments and modifications, the switching valve 10 in which the low-pressure joint tubule 13s, the first casing tubule 13L, and the second casing tubule 13R are connected to the flat surface 122e of the circumferential surface of the valve seat member 122 is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and a curved surface may be formed over the entire circumferential surface without cutting the cylindrical valve seat member in a D shape or the like, and a plurality of tubules may be connected to the curved surface. However, by setting the connection surface of the tubule to the flat surface 122e, workability related to brazing of the tubule can be improved, as described above.

In the above-described embodiment and modification, the switching valve 10 having the first length L11 from the sub-sliding axis X12 to the valve seat side engagement plane 122c-1 set as follows is illustrated as an example of the switching valve. That is, the first length L11 is shorter than the second lengths L12, L12-1 up to the protruding ends of the joint portions 121e, 121e-1, and longer than the third lengths L13, L13-1 up to the outer surfaces of the second portions 121d-2, 121d-4 of the coil portions 121d, 121 d-1. However, the switching valve is not limited to this, and the length dimension of the valve seat member 122 may be set to an arbitrary length. However, by the above-described regulation of the first length L11 with respect to the valve seat member 122, the strength of the switching valve 10 against external force can be further improved, and the size of the switching valve 10 can be further suppressed, as described above.

In the above-described embodiment and modification, the switching valve 10 in which the inlet portion 122b of the valve seat member 122 is fixed in a state where the stepped portion 122g between the large-diameter pillar portion 122f is engaged with the outer peripheral surface of the pilot body 121 is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and for example, the valve seat member may be formed in a columnar shape having the same thickness throughout the entire length. However, by providing the large-diameter pillar portion 122f, the strength of the switching valve 10 against external force can be further improved, as described above. Further, by engaging the step portion 122g with the pillar portion 122f, the valve seat member 122 can be positioned with good workability, as described above.

In the above-described embodiments and modifications, the switching valve 10 including the valve seat member 122 having the low pressure communication hole 122s, the first housing communication hole 122L, the second housing communication hole 122R, and the valve seat through hole 122d formed in a solid body is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and may be provided with a valve seat member in which a pipe as each communication hole is disposed inside a hollow cylinder, for example. However, by providing the valve seat member 122 having the communication holes in the solid body, the strength of the switching valve 10 against external force can be further improved, as described above.

In the above-described embodiments and modifications, the switching valve 10 in which the fixing portion 122c of the valve seat member 122 is received in the receiving recess 111b in a surface contact state and is fixed to the outer wall of the main casing 111 in an engaged state is illustrated as an example of the switching valve. However, the switching valve is not limited to this, and the fixing portion of the valve seat member may be fixed to the outer wall of the main casing without providing the receiving recess. However, by receiving and engaging the fixing portion 122c in the receiving recess 111b in the surface contact state, brazing can be performed in a stable state, and the strength of the switching valve 10 against external force can be further improved as described above.

In the above-described embodiment and modification, the switching valve 10 in which the filter 123 for removing foreign substances is housed in the large-diameter second hole portion 122d-2 in the valve seat through hole 122d is illustrated as an example of the switching valve. The filter 123 is restricted from moving by the stepped portion 122d-3 between the small-diameter first hole 122d-1 and the second hole 122d-2 and the peripheral edge portion of the small-diameter main body through hole 111a communicating with the second hole 122 d-2. However, the switching valve is not limited to this, and a filter may be provided in a thin tube connected to the valve seat member instead of the valve seat through-hole. Even if a filter is provided in the valve seat through hole, the movement restricting structure does not use a difference between the stepped structure in the valve seat through hole and the diameter of the main body through hole, and any restricting structure can be adopted so as to provide a stopper or the like as another member. However, the filter 123 is housed in the valve seat through hole 122d which is easily provided with a margin in space, and thus, the size related to the filter installation can be suppressed. Further, by adopting the movement restricting structure of the filter 123 using the difference between the diameter of the body through hole 111a and the stepped structure inside the valve seat through hole 122d, the number of components related to the filter installation can be suppressed, and the cost can be reduced, as described above.

Claims (11)

1. A switching valve is characterized by comprising:

a switching valve body having a main spool therein, for receiving the sliding movement of the main spool and switching the flow path state;

a pilot drive unit that slides the main spool using a predetermined drive fluid; and

a plurality of tubules connected to the pilot driving unit to pass the driving fluid,

the pilot driving part comprises a pilot main body and a valve seat component, wherein,

the pilot body has a sub spool incorporated therein, and slides the sub spool to switch a flow path state of the driving fluid to slide the main spool,

the valve seat member is a portion that is fixed to the switching valve body so that a part thereof is connected to the plurality of tubules and the other part thereof enters the pilot body to form a valve seat, and is formed with a plurality of tubule communication holes that are connected to the plurality of tubules and form a flow path for the driving fluid together with the plurality of tubules, and a valve seat through-hole that penetrates from the fixed part of the switching valve body to an entering part into the pilot body to form the flow path for the driving fluid, one of the plurality of tubule communication holes and the valve seat through-hole being opened so as to deviate from the valve seat, and the other plurality of holes being opened at the valve seat to be opened and closed by the auxiliary spool,

The switching valve main body includes the main spool and a main housing, wherein,

the main housing accommodates the main spool, the valve seat member of the pilot driving portion is fixed to an outer wall, and a main body through hole which communicates with the valve seat through hole and which forms a flow path of the driving fluid together with the valve seat through hole is formed in the outer wall.

2. The switching valve according to claim 1, wherein,

a plurality of joint pipes respectively communicating with the inside of the main casing are connected to the switching valve main body,

the valve seat member of the pilot driving portion is fixed to an outer wall of the main housing so that the valve seat through-hole is connected to a valve chamber of a high-pressure joint pipe through which a relatively high-pressure fluid flows, of the plurality of joint pipes, via the main body through-hole.

3. The switching valve according to claim 1, wherein,

the main housing is formed in a cylindrical shape, and accommodates the main spool so that the main spool slides along an axis thereof,

the pilot body includes the sub spool and a sub housing, wherein,

the sub-housing is formed in a cylindrical shape, and accommodates the sub-spool so that the sub-spool slides along an axis thereof,

The pilot driving portion is attached to the switching valve body in a configuration in which an axis of the main casing and an axis of the sub-casing extend along each other.

4. The switching valve according to claim 1, wherein,

a plurality of joint pipes connected to the inside of the main casing in a manner such that the respective axes thereof are contained in one plane,

the switching valve main body, the pilot driving portion, and the plurality of joint pipes are arranged such that the main spool and the sub spool each slide in an in-plane direction including a plane of axes of the plurality of joint pipes.

5. The switching valve according to claim 1, wherein,

the valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixing portion, and has a flat surface extending in the axial direction as a part of the peripheral surface,

the plurality of tubules are connected to the flat surface.

6. The switching valve according to claim 1, wherein,

the pilot body in the pilot driving section includes:

a plunger that holds the sub spool and is provided so as to be slidable along a predetermined slide axis;

A plunger tube that slidably accommodates the plunger together with the sub spool;

a coil part wound around the outer periphery of the plunger tube, the coil part being configured to slide the plunger along the sliding axis by being supplied with current; and

a bonding portion for bonding a lead wire for supplying the current to the coil portion,

the engagement portion is provided to avoid interference with the switching valve body from the coil portion, and is provided to protrude from the coil portion in an orthogonal direction orthogonal to the sliding axis,

the coil part is configured to have a first portion provided with the joint part and a second portion other than the first portion,

the first length from the sliding axis to the fixed end of the switching valve main body in the valve seat member is shorter than the second length from the sliding axis to the protruding end of the joint portion, and longer than the third length from the sliding axis to the outer surface of the second portion in the coil portion.

7. The switching valve according to claim 1, wherein,

the valve seat member is a columnar member having one end portion serving as the inlet portion and the other end portion serving as the fixed portion, a pillar portion positioned between the pilot body and the switching valve body and fixed to the switching valve body at the fixed portion to support the pilot body, the pillar portion being thicker than the inlet portion, and a stepped portion being formed at a boundary between the pillar portion and the inlet portion,

The step portion is fixed to the pilot body in a state where the step portion is engaged with the outer peripheral surface of the pilot body in a contact manner.

8. The switching valve according to claim 1, wherein,

the valve seat member is a member in which the plurality of tubule communication holes and the valve seat through-hole are formed in a solid body.

9. The switching valve according to claim 1, wherein,

a valve seat side engagement surface which is in contact engagement with the switching valve body surface is formed on the fixed portion of the valve seat member,

an outer wall of the main housing of the switching valve main body is formed with a receiving recess which receives the fixing portion and whose main body side engagement plane surface in surface contact with the valve seat side engagement plane surface is a bottom surface,

the fixing portion is fixed to an outer wall of the main casing in a state in which a part of an outer peripheral surface of the fixing portion surrounding the valve seat side engagement surface is engaged so as to be in contact with a part of an inner peripheral surface of the receiving recess.

10. The switching valve according to any one of claims 1 to 9, wherein,

the valve seat through hole in the valve seat member is provided with a first hole portion on the side of the inlet portion, a second hole portion which is located on the side of the fixed portion and has a larger diameter than the first hole portion, and a step portion which is located at the boundary between the first hole portion and the second hole portion and connects the two hole portions,

The main body through hole in the main housing is a hole having a smaller diameter than the second hole portion in the valve seat through hole,

further comprises a filter accommodated in the second hole portion for removing foreign matter from the driving fluid flowing through the valve seat through hole,

the step portion restricts movement of the filter toward the first hole portion side in the second hole portion,

the peripheral edge portion of the main body through hole in the outer wall of the main housing restricts movement of the filter toward the main body through hole side in the second hole portion.

11. A refrigeration cycle system, characterized in that,

the refrigerant compressor of the present invention is provided with a compressor for compressing a fluid refrigerant, a first heat exchanger functioning as a condenser in a cooling mode, a second heat exchanger functioning as an evaporator in a cooling mode, an expansion mechanism for expanding the refrigerant between the first heat exchanger and the second heat exchanger and reducing the pressure, and the switching valve of claim 1.