JP3729984B2 - Valve seat plate structure of rotary flow path switching valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary flow path switching valve, and more particularly to a structure of a valve seat plate of a four-way valve or a three-way valve used in a heat pump system.
[0002]
[Prior art]
As a rotary flow path switching valve used as a four-way valve or a three-way valve, a cylindrical valve housing, a valve body that can be rotationally displaced in the valve housing, and a low-pressure side pipe fixed to the valve housing are connected. A low pressure side port, a high pressure side port to which a high pressure side pipe is connected, and a valve seat plate having at least one switching port, and an electromagnetic solenoid for rotationally driving the valve body, It is known that one end face is in contact with the valve seat plate, and is configured to selectively connect the switching port to either the low pressure side port or the high pressure side port by rotational displacement. Yes.
[0003]
The valve seat plate used in the rotary flow path switching valve as described above is generally a machined product by cutting or a press-worked product. Besides this, a cast product, die-cast product, lost product is used. Some of them are cast wax products, forged products, etc.
[0004]
[Problems to be solved by the invention]
The valve seat plate is the most productive and economical to use a press-processed product, but due to the relationship between the plate thickness of the valve seat plate and the plane area ratio, if the plate thickness is thick, there will be warping and warping in press processing. There is a need to increase the holding strength of the male and female molds for processing due to the occurrence of twisting and the need to remove internal stress, and the increased force required for punching with a press machine. Due to these circumstances, it is difficult to manufacture a product with high dimensional accuracy.
[0005]
In the valve seat plate of the rotary flow path switching valve as described above, in particular, the flatness of the seal surface with which the valve body slides is important, but in order to obtain the required rigidity, the plate thickness is thick. It is difficult to obtain the required flatness due to the residual deformation of press working.
[0006]
For this reason, when the plate thickness of the valve seat plate is thick, it is necessary to obtain the required accuracy by performing cutting (secondary processing) on the machined product or the press-worked product. Is bad.
[0007]
Also, in order to fit the valve seat plate into the valve housing and install it, a step for assembly is provided on the outer periphery of the valve seat plate, or a step for inserting a joint pipe into each port of the low pressure side port, high pressure side port and switching port. When providing the part, it is difficult to perform the stepped portion with high precision by pressing, so the cutting product is subjected to cutting, or the cutting product, casting product, die-cast product, lost wax casting product, The valve seat plate must be formed of a forged product, and productivity and economy are poor.
[0008]
The present invention has been made by paying attention to the above-mentioned problems, and even if the plate thickness is large, the required accuracy can be obtained with a press-worked product, and cutting or the like is required. It is also possible to form a stepped portion for assembly and a stepped portion for inserting a joint pipe, and to provide a valve seat plate structure of a rotary flow path switching valve excellent in productivity and economy.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a valve seat plate structure of a rotary type flow path switching valve according to the first aspect of the present invention includes a cylindrical valve housing, a rotational displacement of the valve housing, and a rotational axis direction. A valve seat having a movable main valve body, a low pressure side port fixed to the valve housing and connected to a low pressure side pipe, a high pressure side port connected to a high pressure side pipe, and at least one switching port A valve and an electromagnetic solenoid that rotationally drives the valve body, the valve body is in contact with the valve seat plate at one end face of the valve body, and the switching port is connected to the low-pressure side port by rotational displacement. And a rotary flow path switching valve configured to selectively communicate with any one of the high pressure side port and the valve seat plate, the low pressure side port, the high pressure side port, and the switching port Each paw The pressing plate each is punched a plurality, in which is constituted by overlapping structure that superposition junction.
[0010]
In the valve seat plate structure of the rotary flow path switching valve according to the second aspect of the present invention, the outer dimensions of the plurality of press-processed plate materials are different from each other, and the outer periphery of the overlapped structure is formed by the difference in the outer dimensions. A step portion is formed for fitting the valve seat plate into the valve housing.
[0011]
In the valve seat plate structure of the rotary flow path switching valve according to the invention of claim 3, the punched diameters of the respective ports in the plurality of press-worked plate materials are different from each other, and due to the difference in the punched diameters, the respective port Is formed with a step portion for inserting the joint pipe.
[0012]
According to a fourth aspect of the present invention, there is provided a valve seat plate structure for a rotary flow path switching valve, wherein one of the two pressed plate members in the plurality of pressed plate members has a positioning projection on one of them. On the other side, a positioning hole into which the positioning protrusion is fitted is punched and formed.
[0013]
According to the valve seat plate structure of the rotary flow path switching valve according to the first aspect of the present invention, the valve seat plate is formed by stamping and forming the low pressure side port, the high pressure side port, and the switching port. Because it is composed of a laminated structure with multiple sheets joined together, the thickness of a single pressed plate can be reduced to maintain flatness, As a result, the plate thickness increases, and the required rigidity can be obtained.
[0014]
According to the valve seat plate structure of the rotary flow path switching valve according to the second aspect of the present invention, the outer dimensions of the plurality of press-processed plate materials are different from each other. A step portion for fitting and mounting the valve seat plate in the valve housing on the outer periphery is formed without depending on the cutting process.
[0015]
According to the valve seat plate structure of the rotary flow path switching valve according to the third aspect of the present invention, the punched diameters of the respective ports in the plurality of press-worked plate materials are different from each other, and each port is determined by the difference in the punched diameters. The step portion for inserting the joint pipe is formed without depending on the cutting process.
[0016]
According to the valve seat plate structure of the rotary flow path switching valve according to the fourth aspect of the present invention, in the joined state of the two press-worked plate materials that come into contact with each other and are overlapped by the fitting of the positioning projection and the positioning hole. Positioning is performed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0018]
FIGS. 1-12 has shown one Embodiment of the rotary type flow-path switching valve by this invention. The rotary flow path switching valve is fixed to a cylindrical valve housing 1, a main valve body 3 provided in the valve housing 1 so as to be capable of rotational displacement and movable in the direction of the rotational axis, and the bottom of the valve housing 1. A valve seat plate 5, a pilot valve 9 provided on the main valve body 3, and an electromagnetic solenoid 11 attached to the upper portion of the valve housing 1.
[0019]
This rotary flow path switching valve is configured as a four-way valve 100 used in a heat pump system, and joint pipes 13, 17, 21, 25 for connecting pipes are fitted and fixed to the valve seat plate 5, respectively. The side port 15, the high-pressure side port 19, the first switching port 23, and the second switching port 27 are formed so as to penetrate at locations that are radially displaced from the center of the valve seat plate 5.
[0020]
As shown in FIGS. 5 and 6, the low pressure side port 15 is connected to the low pressure side pipe 102 from the suction side of the compressor P in the heat pump system via the joint pipe 13, and the high pressure side port 19 is connected to the joint pipe 17. The high pressure side pipe 104 from the discharge side of the compressor P is connected to the first switching port 23, and the pipe 106 of the evaporator (indoor heat exchanger) E is connected to the second switching port 27 via the joint pipe 21. The pipes 108 of the condenser (outdoor heat exchanger) C are connected to each other through the joint pipe 25.
[0021]
As shown in FIG. 1, the main valve body 3 is fitted to a center pin 31 fitted and fixed to the valve seat plate 5 through a central guide hole 29 provided at the bottom, and a tongue piece on the upper side. The guide portion 4 formed in a projecting manner is fitted to the main valve body guide cylindrical portion 6 provided concentrically with the large-diameter cylindrical portion 2 on the upper portion of the valve housing 1 so as to be movable in the axial direction. The joint guide is rotationally displaced between the first rotational position and the second rotational position around its own central axis, and vertically displaced between the ascending position and the descending position in the axial direction.
[0022]
The guide portion 4 is formed on the side opposite to the high pressure side communication groove 37 described later, and due to the contact relationship with the main valve body guide cylindrical portion 6, the inclination deviation of the main valve body 3 due to the inflow pressure on the high pressure side. Suppress.
[0023]
In the lowered position, the main valve body 3 is in contact with the upper surface (seal surface) of the valve seat plate 5 at the bottom surface (end surface opposite to the pressure chamber 41) 33, and the bottom surface portion has low pressures independent from each other. A side communication groove 35 and a high-pressure side communication groove 37 are provided.
[0024]
As shown in FIGS. 8 to 12, the valve seat plate 5 punches out the outer pressure punching and the low pressure side port 15a, the high pressure side port 19a, the first switching port 23a, and the second switching port 27a. The formed upper press-processed plate material 5a, and the lower press-processed plate material 5b formed by punching and forming each of the low-pressure side port 15b, the high-pressure side port 19b, the first switching port 23b, and the second switching port 27b along with the outer shape punching. Is formed by a superposed structure obtained by superposing and joining. In addition, the upper press-processed plate material 5a and the lower press-processed plate material 5b are formed by punching attachment holes 6a and 6b of the center pin 31, respectively.
[0025]
Two positioning bosses 81 are formed by burring in the upper pressed plate material 5a, and two positioning holes 83 into which the positioning bosses 81 are respectively fitted are punched and formed in the lower pressed plate material 5b. By fitting the positioning boss 81 with the positioning hole 83, concentric positioning is performed in the overlap joining of the upper press-processed plate material 5a and the lower press-processed plate material 5b.
[0026]
By this concentric positioning, the low-pressure side port 15a, the high-pressure side port 19a, the first switching port 23a, the second switching port 27a, the mounting hole 6a, and the low-pressure side port of the lower press-worked plate material 5b. 15b, the high pressure side port 19b, the first switching port 23b, the second switching port 27b, and the mounting hole 6b are concentrically connected to each other, and the normal low pressure side port 15 penetrating the valve seat plate 5 by this concentric communication, A high pressure side port 19, a first switching port 23, and a second switching port 27 are defined.
[0027]
The outer diameter Da of the upper pressed plate material 5a is smaller than the outer diameter Db of the lower pressed plate material 5b by the thickness of the valve housing 1. Thereby, the step part 85 is formed in the outer periphery of the valve-seat board 5 by the overlapping structure body of the upper side press-processed board | plate material 5a and the lower side press-processed board | plate material 5b. The valve seat plate 5 is fitted and attached to the lower bottom end portion of the valve housing 1 by the step portion 85.
[0028]
Further, the port diameter Pa of each of the low pressure side port 15a, the high pressure side port 19a, the first switching port 23a, and the second switching port 27a of the upper pressed plate material 5a is the low pressure side port of the lower pressed plate material 5b. 15b, the high-pressure side port 19b, the first switching port 23b, and the second switching port 27b are smaller than the port diameter Pb of each port by the pipe thickness of the joint pipes 13, 17, 23, 27. Thereby, the joint pipe insertion step part 87 is formed in each port.
[0029]
The joint pipes 13, 23, 27 other than the joint pipe 17 that also serves as a stopper have their insertion amounts with respect to the respective ports defined by the pipe ends being abutted against the joint pipe insertion stepped portion 87. In the joint pipe 17, the amount of insertion into the high-pressure side port 19 is defined by abutting the enlarged diameter portion 22 formed in the intermediate portion against the joint pipe insertion stepped portion 87.
[0030]
The upper press-processed plate material 5a and the lower press-processed plate material 5b are integrally overlapped and joined by brazing, welding, or the like.
[0031]
As shown in FIG. 5, the main valve body 3 communicates the low pressure side port 15 and the first switching port 23 with the low pressure side communication groove 35 as shown in FIG. 37, the high pressure side port 19 and the second switching port 27 are connected in communication. In the second rotational position, the low pressure side port 15 and the second switching port 27 are connected by the low pressure side communication groove 35 as shown in FIG. The switching port 27 is communicatively connected and the high pressure side port 19 and the first switching port 23 are communicatively connected by the high pressure side communication groove 37.
[0032]
Thereby, in the switching state in which the main valve body 3 is the first rotational position, as shown in FIG. 5, the compressor P → the four-way valve 100 → the outdoor heat exchanger C → the throttle D → the indoor heat exchanger E. The refrigerant circulation path of the four-way valve 100 → the compressor P is established, and the heat pump system enters the cooling mode.
[0033]
On the other hand, in the switching state in which the main valve body 3 is at the second rotational position, as shown in FIG. 6, the compressor P → the four-way valve 100 → the indoor heat exchanger E → the throttle D → the outdoor heat exchanger. A refrigerant circulation path of C → four-way valve 100 → compressor P is established, and the heat pump system enters the heating mode.
[0034]
The tip of the high-pressure side pipe 17 protrudes into the high-pressure side communication groove 37 through the high-pressure side port 19, and the main valve body 3 is rotated by contact with the inner wall surface of the high-pressure side communication groove 37. It also serves as a stopper that limits the displacement range to the reciprocating rotation range between the first rotation position and the second rotation position.
[0035]
As shown in FIG. 1, the main valve body 3 is fitted on the valve housing 1 and a pilot valve guide tube portion 39 formed on the upper portion of the valve housing 1 as shown in FIG. A pressure chamber 41 is defined by the pilot valve 9. The pressure chamber 41 is a slit formed between both ends of a bypass gap 43 between the pilot valve 9 and the main valve body 3 and a piston ring 47 fitted in the piston ring groove 45 of the main valve body 3 (illustrated). Through this, the high pressure side communication groove 37 and the high pressure side port 19 communicate with each other, and the pressure of the high pressure side port 19 is introduced.
[0036]
The pilot valve guide tube portion 39 is provided concentrically with the large diameter cylindrical portion 2 and the main valve body guide tube portion 6, and the plunger portion 10 of the pilot valve 9 is connected to the pilot valve guide tube portion 39 and the main valve body 3. A valve holding hole 51 having a circular cross section formed in the central portion is fitted so as to be movable in the axial direction, and the valve port 55 formed in the main valve body 3 is opened and closed by the needle valve portion 53 at the tip. .
[0037]
With this structure, the pilot valve 9 is fitted to the pilot valve guide tube portion 39 on the valve housing 1 side and the valve holding hole 51 on the main valve body 3 side so as to be movable in the axial direction, and the valve housing 1 and the main valve body 3 are fitted. It will be supported individually by both.
[0038]
As a specific shape of the plunger portion 10, for example, as shown in FIGS. 7A to 7C, the plunger portion 10 has a cut surface 12 on the outer peripheral surface, and has a D-shaped cross-sectional shape or It has a polygonal cross-sectional shape and can be fitted to the pilot valve guide tube portion 39 and the valve holding hole 51 only by the remaining circumferential surface 14.
[0039]
In this case, a passage (not shown) that connects the pressure chamber 41 and the valve port 55 is formed between the cut surface 12 of the pilot valve 9 and the valve holding hole 51.
[0040]
In addition, as another specific shape of the plunger portion 10, as shown in FIG. 7D, a substantially cylindrical shape having an outer diameter corresponding to the inner diameter of the pilot valve guide tube portion 39 and the valve holding hole 51. It is conceivable to fit the pilot valve guide tube portion 39 and the valve holding hole 51 on the entire circumference of the circumferential surface 14.
[0041]
In this case, as shown in FIG. 7 (e), a small diameter portion 10 a is formed at the distal end portion of the plunger portion 10 near the needle valve portion 53, and the small diameter portion 10 a passes through the center of the plunger portion 10. A through passage 10b is provided in the radial direction of the plunger portion 10, and a communication passage 10c extending from the end surface located on the pilot valve guide tube portion 39 side opposite to the needle valve portion 53 to the center of the through passage 10b is a plunger. A passage (not shown) that is formed in the axial direction of the portion 10 and that communicates the pressure chamber 41 and the valve port 55 through the through passage 10b and the communication passage 10c, and the space between the small diameter portion 10a and the valve holding hole 51. Is configured.
[0042]
The valve port 55 is in the center of the bottom of the valve holding hole 51 and communicates with the pressure chamber 41 through the bypass gap 43 on the one hand and communicates with the low pressure side communication groove 35 through the communication hole 57 on the other hand.
[0043]
The pilot valve 9 is energized in the valve closing direction by a spring 61 provided between the solenoid valve 11 and the fixed attractor 59 of the electromagnetic solenoid 11, and energization is performed on the electromagnetic coil 63 of the electromagnetic solenoid 11. Against the stationary suction element 59, the valve port 55 is opened, that is, the valve is opened.
[0044]
A multi-pole magnet 71 made of plastics magnet is integrally provided on the upper portion of the main valve body 3 by insert molding. The multipolar magnet 71 has a ring shape concentric with the main valve body 3 and has two N pole portions and two S pole portions alternately in the rotation direction of the main valve body 3.
[0045]
A staple-shaped main magnetic pole member 65 magnetically coupled to one magnetic pole on the upper side of the electromagnetic coil 63 is fixed to the electromagnetic solenoid 11 by a bolt 67, and the other magnetic pole on the lower side of the electromagnetic coil 63 is fixed. The staple-shaped sub magnetic pole member 69 is fixed to the main magnetic pole member 65 at a position rotated and rotated 90 degrees around the central axis of the valve housing 1.
[0046]
In the electromagnetic actuator structure including the electromagnetic solenoid 11 and the multipolar magnet 71 as described above, the main magnetic pole member 65 is magnetized to the N pole and the sub magnetic pole member 69 is magnetized to the S pole, or vice versa, depending on the direction of the current flowing to the electromagnetic solenoid 11. The main valve element 3 is rotationally displaced from the first rotational position to the second rotational position, or vice versa by the magnetic action with the multipolar magnet 71.
[0047]
In the four-way valve 100 configured as described above, when the electromagnetic coil 63 of the electromagnetic solenoid 11 is energized in the state shown in FIG. 1, the fixed attractor 59 is excited and the pilot valve 9 is spring-loaded. The valve 61 is lifted and displaced against the spring force 61 and is attracted to the fixed suction element 59, and the valve port 55 is opened.
[0048]
As a result, the pressure chamber 41 communicates with the low pressure side communication groove 35 and the low pressure side port 15, and the internal pressure of the pressure chamber 41 changes from the same high pressure as the high pressure side port 19 to the same low pressure as the low pressure side port 15 due to the suction pressure of the compressor P. Will drop. As a result, the upper side of the main valve body 3 becomes lower in pressure than the lower side of the main valve body 3, and the main valve body 3 is displaced upward due to the pressure difference, and is separated from the valve seat plate 5 and can be rotationally displaced with low resistance become.
[0049]
When the pilot valve 9 is opened, the internal pressure of the pressure chamber 41 decreases because the degree of communication between the pressure chamber 41 and the high pressure side communication groove 37 and the high pressure side port 19 is reduced by the slit portion of the piston ring 47. This is because the degree of communication is set to a value lower than the degree of communication between the pressure chamber 41 and the low pressure side communication groove 35 when the pilot valve 9 is opened.
[0050]
In the above state, the main valve element 3 is rotationally displaced from the first rotational position to the second rotational position by the magnetic action of the magnetic poles of the main magnetic pole member 65 and the sub magnetic pole member 69 and the multipolar magnet 71, or On the contrary, the rotational displacement occurs, and the heat pump cycle is switched to the cooling mode or the heating mode.
[0051]
Thereafter, when energization to the electromagnetic coil 63 is stopped, the pilot valve 9 is lowered and closed by the spring force of the spring 61, the communication between the pressure chamber 41 and the low pressure side communication groove 35 is cut off, and the bypass gap 43 and The pressure in the high pressure side communication groove 37 and the high pressure side port 19 is introduced into the pressure chamber 41 through the slit portion 49 of the piston ring 47, and the pressure chamber 41 becomes the same pressure as the pressure in the lower part of the main valve body 3. The main valve element 3 returns to the original lowered position due to the spring force of the main valve element 3 and the weight of the main valve element 3, and comes into close contact with the valve seat plate 5.
[0052]
In the valve structure as described above, the flatness of the upper surface of the valve seat plate 5 which is a sealing surface is important. On the other hand, the valve seat plate 5 is formed by punching the lower pressure side port 15, the high pressure side port 19, the first switching port 23, and the second switching port 27. Since it is composed of an overlapping structure in which the pressed plate material 5b is overlapped and joined, the plate thickness of the single pressed plate material 5a, 5b can be reduced to maintain flatness, and the pressed plate material By overlapping with 5a and 5b, the plate thickness is increased as a whole, and the required rigidity can be obtained. That is, the flatness and the rigidity can be compatible with the valve seat plate 5 made of a press-formed product.
[0053]
In addition, the stepped portion 85 for fitting and mounting the valve seat plate 5 on the valve housing 1 and the joint pipe inserting stepped portion 87 of each port are formed without depending on the cutting process, and have the required performance. The valve seat plate 5 can be manufactured economically with high productivity.
[0054]
Further, the fitting between the positioning boss 81 and the positioning hole 83 ensures the positioning in the superposition joining of the upper press-processed plate material 5a and the lower press-processed plate material 5b, and this also provides a highly accurate valve seat. The plate 5 can be manufactured economically with high productivity.
[0055]
The valve seat plate 5 is not limited to an overlap structure formed by two upper and lower pressed plates, and may be formed by an overlap structure formed by three or more pressed plates. No limitation is imposed on the number of superimposed sheets.
[0056]
Further, the positioning boss 81 and the positioning hole 83 may be arranged oppositely to the present embodiment. Specifically, the positioning hole 83 is formed in the upper press-processed plate material 5a, and the lower press-processed plate material 5b. Alternatively, the positioning boss 81 may be formed. Then, the positioning boss 81 may be replaced with a projection by half blank (extrusion processing) or a pin by fixing another member.
[0057]
Furthermore, although the present embodiment has been described by taking a four-way valve as an example, it is needless to say that the present invention can be similarly applied to a rotary three-way valve.
[0058]
【The invention's effect】
As can be understood from the above description, according to the valve seat plate structure of the rotary flow path switching valve according to the first aspect of the present invention, the cylindrical valve housing, the valve housing can be rotationally displaced, and the rotary shaft can be rotated. A main valve body movably provided in a direction, a low pressure side port fixed to the valve housing and connected to a low pressure side pipe, a high pressure side port connected to a high pressure side pipe, and at least one switching port A valve seat plate; and an electromagnetic solenoid that rotationally drives the valve body. The valve body is in contact with the valve seat plate at one end surface of the valve body, and the switching port is connected to the low pressure by rotational displacement. In the rotary flow path switching valve configured to selectively communicate with either one of the side port and the high pressure side port, the valve seat plate includes the low pressure side port, the high pressure side port, and the Switching port The pressing plate each is stamped each port, a plurality, and assumed to be composed of overlapping structures and superposition junction.
[0059]
For this reason, the valve seat plate is composed of a laminated structure in which a plurality of press-worked plate materials formed by punching the low-pressure side port, the high-pressure side port, and the switching port are overlapped and joined. The plate thickness of the pressed plate material can be reduced to maintain flatness, and by stacking the pressed plate material, the overall plate thickness is increased and the required rigidity can be obtained. Even if the plate thickness of the valve seat plate is large, the required accuracy can be obtained with a press-processed product, and the valve seat plate of the rotary flow path switching valve excellent in productivity and economy can be obtained.
[0060]
In the valve seat plate structure of the rotary flow path switching valve according to the second aspect of the present invention, the outer dimensions of the plurality of press-processed plate materials are different from each other, and the outer periphery of the overlapped structure is caused by the difference in the outer dimensions. A step portion for fitting and mounting the valve seat plate on the valve housing is formed.
[0061]
As a result, the outer dimensions of the plurality of press-processed plate materials are different from each other. Due to the difference in the outer dimensions, the stepped portion for fitting the valve seat plate into the valve housing on the outer periphery of the overlapped structure is attached to the cutting process. Therefore, a valve seat plate having a stepped portion for fitting and mounting is manufactured with good productivity and economically.
[0062]
According to the valve seat plate structure of the rotary flow path switching valve according to the invention of claim 3, the punched diameters of the respective ports in the plurality of press-worked plate materials are different from each other, and due to the difference in the punched diameters, Each port is assumed to have a stepped portion for inserting a joint pipe.
[0063]
As a result, the punched diameters of each port in a plurality of press-worked plate materials are different from each other, and due to this punched diameter difference, a stepped portion for inserting a joint pipe is formed in each port without depending on the cutting process. As a result, a valve seat plate having a stepped portion for inserting a joint pipe can be manufactured with high productivity and economically.
[0064]
According to the valve seat plate structure of the rotary type flow path switching valve according to the fourth aspect of the present invention, one of the two pressed plate members in contact with each other in the plurality of pressed plate members is positioned for positioning. The protrusion is fixed, and the other is formed with a positioning hole into which the positioning protrusion is fitted.
[0065]
As a result, the positioning projection and the positioning hole are fitted to each other so that the positioning in the overlap joining of the two press-processed plate materials that are in contact with each other is accurately performed. Well, it will be produced economically.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of a valve seat plate structure of a rotary flow path switching valve according to the present invention.
2 is a plan view of the rotary flow path switching valve of FIG. 1; FIG.
3 is a bottom view of the rotary flow path switching valve of FIG. 1. FIG.
4 is a side view of the rotary flow path switching valve of FIG. 1. FIG.
5 is an explanatory diagram showing a refrigerant circuit configuration during cooling operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system.
6 is an explanatory diagram showing a refrigerant circuit configuration during heating operation when the rotary flow path switching valve of FIG. 1 is incorporated in a heat pump system. FIG.
7A to 7D are end views of the pilot valve of FIG. 1, and FIG. 7E is a cross-sectional view of the pilot valve of FIG.
FIG. 8 is an enlarged plan view of an upper press plate for a valve seat plate used in the rotary flow path switching valve according to the present invention.
FIG. 9 is a cross-sectional view taken along line AA of the upper press-processed plate material of FIG.
FIG. 10 is an enlarged plan view of a lower press processed plate material for a valve seat plate configuration used in the rotary flow path switching valve according to the present invention.
11 is a cross-sectional view of the upper pressed plate material of FIG. 10 taken along line BB.
FIG. 12 is an enlarged longitudinal sectional view of a valve seat plate used in the rotary flow path switching valve according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve housing 3 Main valve body 5 Valve seat board 5a, 5b Press work board | plate material 9 Pilot valve 11 Electromagnetic solenoid 15 Low pressure side port 19 High pressure side port 23 First switching port 27 Second switching port 35 Low pressure side communication groove 37 High pressure Side communication groove 41 Pressure chamber 45 Piston ring groove 47 Piston ring 55 Valve port 59 Fixed attractor 63 Electromagnetic coil 65 Main magnetic pole member 69 Sub magnetic pole member 71 Multipolar magnet 81 Positioning boss 83 Positioning hole 85 Step portion 87 Joint pipe insertion step Part

Claims (4)

A cylindrical valve housing;
A main valve body provided in the valve housing so as to be capable of rotational displacement and movable in the direction of the rotational axis;
A low pressure side port fixed to the valve housing and connected to a low pressure side pipe, a high pressure side port connected to a high pressure side pipe, and a valve seat plate having at least one switching port;
An electromagnetic solenoid that rotationally drives the valve body;
The valve body is in contact with the valve seat plate at one end surface of the valve body, and the switching port is selectively connected to one of the low-pressure side port and the high-pressure side port by rotational displacement. In the rotary flow path switching valve configured as follows:
The valve seat plate is constituted by a laminated structure in which a plurality of press-worked plate materials each formed by punching the low-pressure side port, the high-pressure side port, and the switching port are laminated and joined. Yes,
A valve seat plate structure for a rotary flow path switching valve. The outer dimensions of the plurality of press-processed plate materials are different from each other, and a stepped portion for fitting and mounting the valve seat plate on the valve housing is formed on the outer periphery of the overlapping structure due to the difference in the outer dimensions. The valve seat plate structure for a rotary flow path switching valve according to claim 1. 2. The punched diameter of each port in the plurality of press-worked plate materials is different from each other, and a stepped portion for inserting a joint pipe is formed in each port due to the difference in the punched diameter. Or the valve-seat board structure of the rotary type flow-path switching valve of 2. A positioning projection is fixed to one of the two pressed plates in contact with each other in the plurality of pressed plates, and a positioning hole into which the positioning projection is fitted is punched and formed on the other. The valve seat plate structure of the rotary flow path switching valve according to claim 1, 2, or 3.

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