CN218598827U - Electrically driven valve - Google Patents
Electrically driven valve Download PDFInfo
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- CN218598827U CN218598827U CN202222416555.7U CN202222416555U CN218598827U CN 218598827 U CN218598827 U CN 218598827U CN 202222416555 U CN202222416555 U CN 202222416555U CN 218598827 U CN218598827 U CN 218598827U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model provides an even moving body such as plunger inclines also can avoid the case slope and prevent the electrically driven valve of valve leakage when the valve closes. The electrically driven valve includes: a valve body having a main valve chamber and a pilot valve chamber; an inflow path of the refrigerant to the main valve chamber; an outlet passage for the refrigerant from the main valve chamber; a valve port having a main valve seat; a main valve element for opening and closing the valve port; a pilot passage that passes through the main spool and selectively communicates the pilot valve chamber with the outlet passage; a pilot valve seat arranged at the end part of the pilot passage; a pilot valve element for opening and closing the pilot passage; a moving body holding the pilot valve element; a valve receiving member interposed between the pilot valve core and the movable body, and transmitting a pressing force for pressing the pilot valve core against the pilot valve seat to the pilot valve core when the valve is closed; a drive device for driving a pilot valve body via a movable body forms a point contact portion where a convex curved surface and a flat surface contact each other or a point contact portion where convex curved surfaces contact each other between the pilot valve body and a valve receiving member.
Description
Technical Field
The present invention relates to an electric drive valve, and more particularly to a valve core structure capable of preventing leakage of a valve even when a movable body such as a plunger supporting a valve element in an electromagnetic valve or an electric valve is inclined when the valve is closed.
Background
An electrically driven valve that opens and closes a valve using an electric drive device such as a solenoid or an electric motor is used in a refrigeration cycle device including a refrigerant circuit such as an air conditioner, a refrigerator, or a freezer.
In such an electrically driven valve, a valve element that opens and closes a refrigerant flow path is supported by a movable body (for example, a plunger or a valve rod) provided in the electrically driven valve and slidable in a valve opening/closing direction (axial direction). For example, in the case of an electromagnetic valve, a plunger is moved by a solenoid or a compression coil spring, and in the case of an electric valve, a valve rod is moved by an elevating device using a motor (electric motor), thereby opening and closing the valve.
As a document disclosing such an electrically driven valve, there is patent document 1 below.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2017-160983
Technical problem to be solved by the utility model
However, the movable body supporting the valve element is accommodated in a cylindrical member (bush) and is guided by the cylindrical member so as not to be laterally displaced, but a certain amount of play is provided between the movable body and the inner circumferential surface of the cylindrical member so as to be slidable.
On the other hand, the drive valve is not necessarily provided in the refrigerant circuit so that the axial direction of the valve is vertical, and may be provided in an inclined or horizontal state, for example, depending on the space of the pipe, the arrangement direction of the pipe, and the like.
Therefore, the movable body sliding in the bush may be inclined at the time of valve closing operation, and the valve body supported by the movable body is also inclined in accordance with the inclination, and a gap may be generated between the valve seat and the valve body, thereby causing valve leakage.
In order to prevent such valve leakage, it is known to use an elastic material for the valve body to absorb the inclination of the valve body when the valve is closed.
However, when an elastic material is used, there is a problem that durability of the valve element is reduced, and it is desired to provide a further solution.
The invention described in patent document 1 cannot solve the problem of valve leakage described above.
SUMMERY OF THE UTILITY MODEL
Therefore, an object of the present invention is to provide a new valve body structure in which valve leakage does not occur even if a movable body supporting a valve body is inclined.
Means for solving the problems
In order to solve the technical problem, an electric drive valve according to a first aspect of the present invention includes: a valve body having a main valve chamber and a pilot valve chamber therein; an inflow path through which the refrigerant flows into the main valve chamber; an outflow passage through which the refrigerant flows out of the main valve chamber; a valve port having a main valve seat and provided between the outflow passage and the main valve chamber in such a manner as to be open in the main valve chamber; a main valve element that opens and closes a valve port by moving forward and backward relative to a main valve seat; a pilot passage that passes through the main spool and selectively communicates the pilot valve chamber with the outflow passage; a pressure equalizing path which communicates the main valve chamber with the pilot valve chamber; a pilot valve seat formed at a pilot valve chamber-side end of the pilot passage; a pilot valve element that moves forward and backward relative to the pilot valve seat to open and close the pilot passage; a moving body which holds the pilot valve element and moves together with the pilot valve element; a valve receiving member interposed between the pilot valve core and the movable body, the valve receiving member transmitting a pressing force to the pilot valve core, the pressing force pressing the pilot valve core against the pilot valve seat to close the pilot passage; and an electric drive device that drives the pilot valve body via the movable body, wherein a point contact portion where the convex curved surfaces contact with the flat surfaces or a point contact portion where the convex curved surfaces contact with each other is formed between the pilot valve body and the valve receiving member, and the pressing force is transmitted from the valve receiving member to the pilot valve body via the point contact portion.
In addition, the phrase "selectively communicate with" as to the above-mentioned pilot passage means that the pilot passage is not always in a communication state, but means that the pilot valve body is opened and closed, and the pilot valve body is seated on the pilot valve seat to close the pilot passage when the electrically driven valve is closed, and the pilot valve body is separated (separated) from the pilot valve seat to open the pilot passage when the electrically driven valve is opened (the same applies to a second utility model described later). On the other hand, the pressure equalizing passage is always opened to communicate the main valve chamber and the pilot valve chamber. The cross-sectional area (flow path area) of the uniform pressure passage is smaller than that of the pilot passage. The opening and closing operation of the electrically driven valve will be described in detail in the following description of the embodiment.
The first utility model provides an electric drive valve relates to and controls the pilot type drive valve of main valve through the pilot valve that drives through electric drive, in this drive valve, forms point contact portion between valve receiving part and pilot valve core to transmit the pressing force when closing the valve to the pilot valve core through this point contact portion, valve receiving part transmits the pressing force that presses the pilot valve core in the pilot valve seat and close the pilot valve to the pilot valve core.
The point contact portion is formed on a surface on the valve receiving member side (a contact surface with the pilot valve core) to which the pressing force is transmitted and a surface on the pilot valve core side (a contact surface with the valve receiving member) to which the pressing force is transmitted, but may be any of (1) a system in which the surface on the valve receiving member side is a convex curved surface and the surface on the pilot valve core side is a plane, (2) a system in which the surface on the valve receiving member side is a plane and the surface on the pilot valve core side is a convex curved surface, and (3) a system in which both the surface on the valve receiving member side and the surface on the pilot valve core side are convex curved surfaces.
If the valve receiving member and the pilot valve body (hereinafter, may be simply referred to as "valve body") are brought into contact via such a point contact portion, unlike the case where the flat surfaces are brought into contact with each other, even if the movable body is inclined, the inclination variation is not transmitted to the pilot valve body via the valve receiving member, and when the valve is closed, the pilot valve body can be prevented from being inclined together with the movable body and the valve receiving member, and the occurrence of valve leakage (leakage of refrigerant to the outflow path through the pilot passage) can be prevented.
The "convex curved surface" is typically a spherical surface, but is not limited thereto, and may be, for example, a parabolic surface or another convex curved surface.
In addition, according to the present invention (the first invention and the second to fourth inventions described later refer to the first to fourth inventions/the general name of the present invention in the case of "the present invention"), it is not necessary to use an elastic material for the valve element (pilot valve element) in order to avoid valve leakage in the past, and therefore, the pilot valve element can be formed of a hard material, and durability can be improved.
In the present invention, an "electric drive" is typically an electromagnetic actuator that moves a moving body (plunger) by a magnetic force generated by a solenoid. However, the movable body may be moved by a motor (electric motor), and the electric drive device may include a motor.
In the present invention, the "pressing force" may be a force generated by an electric drive device (e.g., an electromagnetic actuator or a motor) (e.g., a magnetic force generated by a solenoid or a linear force obtained by converting a rotational force generated by a motor into a linear motion), or may be a force generated by a mechanical component (e.g., a coil spring) other than the electric drive device (e.g., an elastic force of a compression coil spring). In the first invention (and also in a third invention described later), the valve receiving member receives these forces and transmits these forces as a pressing force to the pilot valve element.
The valve receiving member may be a plate-like member having a flat surface on the side contacting the movable body and a convex curved surface on the side contacting the pilot valve element.
The valve receiving member may be a plate-shaped member (thin plate member) having a center portion recessed toward the pilot valve core to form a convex curved portion protruding toward the pilot valve core. Such a valve receiving member can be manufactured by press working, and the use of the valve receiving member has an advantage that the manufacturing cost of the electrically driven valve can be reduced.
The valve receiving member may be a spherical member.
An electric drive valve according to a second aspect of the present invention is a pilot-type drive valve similar to the first aspect of the present invention, but does not include a valve receiving member, and forms a point contact portion between the movable body and the pilot valve element.
Specifically, the electrically driven valve comprises: a valve body having a main valve chamber and a pilot valve chamber therein; an inflow passage through which the refrigerant flows into the main valve chamber; an outflow passage through which the refrigerant flows out of the main valve chamber; a valve port having a main valve seat and provided between the outflow passage and the main valve chamber in such a manner as to open in the main valve chamber; a main valve element that opens and closes a valve port by moving forward and backward relative to a main valve seat; a pilot passage that passes through the main spool and selectively communicates the pilot valve chamber with the outflow passage; a pressure equalizing path which communicates the main valve chamber with the pilot valve chamber; a pilot valve seat formed at an end of the pilot passage on the pilot valve chamber side; a pilot valve element that moves forward and backward relative to the pilot valve seat to open and close the pilot passage; a movable body that moves together with the pilot valve core while holding the pilot valve core, and that transmits a pressing force to the pilot valve core, the pressing force pressing the pilot valve core against the pilot valve seat to close the pilot passage; and an electric drive device that drives the pilot valve body via the movable body, wherein a point contact portion where the convex curved surfaces contact with the flat surface or a point contact portion where the convex curved surfaces contact with each other is formed between the pilot valve body and the movable body, and the pressing force is transmitted from the movable body to the pilot valve body via the point contact portion.
In the electrically driven valve according to the second aspect of the present invention, the pressing force is directly transmitted from the movable body to the pilot valve element without passing through the valve receiving member, but by forming the point contact portion between the movable body and the pilot valve element, the valve can be prevented from leaking by avoiding the inclination of the pilot valve element even if the movable body is inclined when the valve is closed.
In the second invention, the point contact portions are formed on the surface on the side of the moving body that transmits the pressing force (the contact surface with the pilot valve core) and the surface on the side of the pilot valve core that is transmitted the pressing force (the contact surface with the moving body), but any of (1) a mode in which the surface on the side of the moving body is a convex curved surface and the surface on the side of the pilot valve core is a plane, (2) a mode in which the surface on the side of the moving body is a plane and the surface on the side of the pilot valve core is a convex curved surface, and (3) a mode in which both the surface on the side of the moving body and the surface on the side of the pilot valve core are convex curved surfaces may be employed.
Furthermore, the utility model discloses also can be applied to the valve of direct action type, the third utility model discloses an electrically driven valve of this application is the drive valve of the direct action type that possesses the valve receiving part.
Particularly, this third utility model's electric drive valve utensil possesses: a valve body having a valve chamber therein; a first flow path that is one of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber; a second flow path that is the other of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber; a valve port having a valve seat and provided between the first flow path and the valve chamber or between the second flow path and the valve chamber so as to be opened in the valve chamber; a valve element that moves back and forth relative to the valve seat between a valve-closed position, in which the valve element is pressed against the valve seat by receiving a pressing force in a valve-closing direction to close the valve port, and a valve-open position, in which the valve element is separated from the valve seat to open the valve port; a moving body which holds the valve body and moves together with the valve body; a valve receiving member interposed between the movable body and the valve body, the valve receiving member transmitting a pressing force to the valve body; and an electric drive device that drives the valve element via the movable body, wherein a point contact portion where the convex curved surfaces contact with the flat surfaces or a point contact portion where the convex curved surfaces contact with each other is formed between the valve element and the valve receiving member, and the pressing force is transmitted from the valve receiving member to the valve element via the point contact portion.
In such a direct acting valve, similarly to the above-described pilot driven valve, it is possible to prevent the inclination of the moving body from being transmitted to the valve body, and to prevent the valve from leaking (leakage of the refrigerant from the valve chamber to the outlet passage).
In the third invention, similarly to the first invention, the valve receiving member may be (1) a plate-like member in which a surface on the side contacting the movable body is a flat surface and a surface on the side contacting the valve element is a convex curved surface, (2) a plate-like member in which a central portion is recessed toward the valve element to form a convex curved surface portion protruding toward the valve element, or (3) a spherical member.
Further, an electrically driven valve according to a fourth aspect of the present invention is a directly-operated valve similar to the third aspect of the present invention, but does not include a valve receiving member.
Specifically, the electrically driven valve according to the fourth invention comprises: a valve body having a valve chamber therein; a first flow path that is one of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber; a second flow path that is the other of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber; a valve port having a valve seat and provided between the first flow path and the valve chamber or between the second flow path and the valve chamber so as to be open in the valve chamber; a valve element that moves forward and backward relative to the valve seat between a valve-closed position in which the valve element is pressed against the valve seat by receiving a pressing force in a valve-closing direction to close the valve port and a valve-open position in which the valve element is separated from the valve seat to open the valve port; a moving body that holds the valve body and moves together with the valve body; and an electric drive device that drives the valve element via the movable body, wherein a point contact portion where the convex curved surfaces contact with the flat surface or a point contact portion where the convex curved surfaces contact with each other is formed between the valve element and the movable body, and the pressing force is transmitted from the movable body to the valve element via the point contact portion.
Effect of the utility model
According to the present invention, even if the movable body supporting the valve element is inclined during the valve closing operation, the valve element can be prevented from being inclined, and valve leakage can be prevented.
Other objects, features and advantages of the present invention will become apparent from the following description of the embodiments of the present invention based on the accompanying drawings. In the drawings, the same reference numerals denote the same or equivalent parts.
Drawings
Fig. 1 is a longitudinal sectional view showing an electromagnetic valve (closed valve state) according to a first embodiment of the present invention.
Fig. 2 is an enlarged longitudinal sectional view of main portions (a plunger and a pilot valve portion) of the electromagnetic valve (a closed valve state) according to the first embodiment.
Fig. 3 is a longitudinal sectional view showing a state of a main portion (a plunger and a pilot valve portion) in a case where the plunger is inclined at the time of closing the valve in the electromagnetic valve according to the first embodiment.
Fig. 4 is a vertical cross-sectional view showing a state of main parts (a plunger and a pilot valve section) in a case where the plunger is inclined at the time of closing in the conventional electromagnetic valve, for comparison with the electromagnetic valve according to the first embodiment.
Fig. 5 is a longitudinal sectional view showing a modification of the main portions (plunger and pilot valve portion) of the electromagnetic valve (closed valve state) according to the first embodiment.
Fig. 6 is a vertical cross-sectional view showing another configuration example of main portions (a plunger and a pilot valve portion) of the electromagnetic valve (a valve-closed state) according to the first embodiment.
Fig. 7 is a longitudinal sectional view showing another configuration example of main parts (a plunger and a pilot valve portion) of the electromagnetic valve (a valve closed state) according to the first embodiment.
Fig. 8 is a longitudinal sectional view showing another configuration example of main parts (a plunger and a pilot valve portion) of the electromagnetic valve (a valve closed state) according to the first embodiment.
Fig. 9 is a longitudinal sectional view showing another configuration example of main portions (a plunger and a pilot valve portion) of the electromagnetic valve (a closed valve state) according to the first embodiment.
Fig. 10 is a longitudinal sectional view showing another configuration example of main parts (a plunger and a pilot valve portion) of the electromagnetic valve (a valve-closed state) according to the first embodiment.
Fig. 11 is a longitudinal sectional view showing an electromagnetic valve (valve-closed state) according to a second embodiment of the present invention.
Description of the symbols
A, the central axis of the electromagnetic valve;
a1 A central axis of the plunger;
f1, F2 refrigerant flows;
11. 61 electrically driven valves (solenoid valves);
12. a valve section;
13. an electromagnetic actuator;
14. a housing member;
14a valve mounting hole;
15. an inflow path;
16. an outflow path;
17. a valve port;
18. a valve seat (main valve seat);
19. a brazing section;
21. a valve body;
21a upper surface of the valve body is open;
21b a lower surface opening of the valve body;
21c a lower end peripheral edge portion of the upper surface opening of the valve main body;
22. a valve chamber (main valve chamber);
23. a main valve element;
23a step portion;
24. a pilot passage;
25. a pilot valve seat;
26. a valve opening spring;
27. a pilot valve chamber;
31. a pilot valve spool;
31a upper surface of the pilot poppet;
31b lower surface of pilot poppet;
32. a valve receiving member;
32a an upper surface of the valve receiving member;
32b the lower surface of the valve-receiving member;
33. a point contact portion;
34. a retainer ring;
41. a coil;
42. a bobbin;
43. an attracting element;
44. a plunger;
44a spool holding bore;
44b a lower end peripheral edge portion of the valve element holding hole;
44c a bore for receiving a valve receiving spring;
44d spring receiving holes;
45. a valve closing spring;
46. the valve receives the spring;
51. a bushing;
62. a valve core.
Detailed Description
[ first embodiment ]
As shown in fig. 1 to 2, an electrically driven valve 11 according to a first embodiment of the present invention includes a valve portion 12 that opens and closes a flow path of a refrigerant, and an electromagnetic actuator 13 that drives the valve portion 12, and the electrically driven valve 11 is an electromagnetic valve that controls a flow of the refrigerant in a refrigeration cycle apparatus such as a heat pump type cooling and heating system, for example. The solenoid valve 11 is a pilot type solenoid valve in which a main valve for opening and closing a refrigerant flow path is controlled by a pilot valve, and is a normally closed type (normally closed type) valve that is closed when electric power is supplied to the electromagnetic actuator 13.
In the drawings, the orthogonal two-dimensional coordinates representing the vertical and horizontal directions are appropriately displayed, and the following description will be made based on these directions, but the solenoid valves according to the present invention and the embodiments can be used in various orientations, and the directions are for convenience of description, and the structure of each part of the present invention is not limited at all.
The valve section 12 includes: a valve main body 21 provided in a housing member 14 provided with an inflow passage 15 and an outflow passage 16 for the refrigerant; a main valve (a main valve body 23, a main valve seat 18, and the like) provided in a main valve chamber 22 in the valve body 21; and a pilot valve (a pilot valve core 31, a pilot valve seat 25, and the like) that controls the main valve and is provided in the pilot valve chamber 27 in the valve main body 21.
The valve body 21 is a cylindrical member having openings (an upper surface opening 21a and a lower surface opening 21 b) on the upper surface and the lower surface, respectively, and is inserted into the valve mounting hole 14a of the housing member 14, and thereafter, the peripheral edge portion of the valve mounting hole 14a is caulked, and further, is fixed to the housing member 14 by brazing (see reference numeral 19 in fig. 1).
A lower space in the valve body 21 is a main valve chamber 22, and the main valve chamber 22 communicates with the inflow passage 15 and the outflow passage 16 of the housing member 14. That is, the end portion of the outlet passage 16 on the valve main body 21 side is provided with a valve port 17, the valve port 17 stands vertically upward, protrudes from the lower surface opening 21b of the valve main body 21 into the main valve chamber 22, and the upper surface portion of the valve port 17 is used as an outlet port for flowing the refrigerant from the main valve chamber 22 to the outlet passage 16 and is used as a main valve seat 18 with which the main valve element 23 is in contact with and separated (in contact with and separated from) from each other. The opening portion around the valve port 17 in the lower surface opening 21b of the valve body 21 is an inlet port through which the refrigerant from the inlet passage 15 flows into the main valve chamber 22.
Further, a main valve body 23 is provided in the main valve chamber 22, and the main valve body 23 has a columnar overall shape and is slidably fitted to the valve main body 21 (disposed so as to be movable forward and backward with respect to the main valve seat 18). The main valve element 23 is biased upward by a valve-opening spring 26 provided in the main valve chamber 22. The valve-opening spring 26 is a compression coil spring provided in a compressed state between the bottom surface peripheral edge portion of the valve main body 21 and a step portion 23a formed on the lower outer peripheral surface of the main valve body 23.
The main spool 23 is provided with a pilot passage 24, the pilot passage 24 penetrating the center portion of the main spool 23 in the direction of the axis a (vertical direction) to communicate the main valve chamber 22 with the pilot valve chamber 27, and a pressure equalizing passage (not shown) having a smaller diameter than the pilot passage 24, the pressure equalizing passage similarly communicating the main valve chamber 22 with the pilot valve chamber 27. The pressure equalizing passage is not opened and closed but always communicates the main valve chamber 22 with the pilot valve chamber 27, but the pilot passage 24 is opened and closed by a pilot valve core 31 as described below. The pressure equalizing passage of the present embodiment is a gap between the main spool 23 and the inner circumferential surface of the valve main body 21. The main valve chamber 22 of the present embodiment is a space between the main valve body 23 and the main valve seat 18 and a space facing the inflow passage 15, and the pilot valve chamber 27 of the present embodiment is a space formed above the main valve body 23.
A pilot valve chamber 27 is formed in an upper surface portion of the main valve body 23 and includes a pilot valve. Specifically, a pilot valve seat 25 is formed at a central portion of an upper surface of the main valve body 23 (an upper end portion of the pilot passage 24) where the pilot passage 24 opens to the pilot valve chamber 27, and a pilot valve body 31 is provided so as to be capable of contacting and separating with respect to the pilot valve seat 25. The pilot valve body 31 is held at the lower end of a plunger 44 as a movable body as described later, and moves up and down together with the plunger 44 to open and close the pilot passage 24.
On the other hand, the electromagnetic actuator 13 includes: a coil 41 wound around the bobbin 42, an attracting element 43 disposed inside the coil 41, and a plunger 44 attracted to the attracting element 43 by a magnetic force generated by the coil 41. The bobbin 42 has a cylindrical portion at the center, and the suction element 43 and the plunger 44 are disposed in the cylindrical portion in a state of being housed in the bush 51.
The bush 51 is a bottomless and capless (upper and lower surfaces are open) cylindrical member, and is fixed at an upper end portion to an outer peripheral surface of the suction element 43 such that the upper surface is closed by the suction element 43, and is fixed at an upper portion of the valve main body 21 by inserting a lower end portion from an upper surface opening 21a of the valve main body 21 into the valve main body 21.
The plunger 44 is housed inside the bush 51 (below the attraction member 43) so as to be slidable in the vertical direction. Further, a valve-closing spring 45 formed of a compression coil spring is provided between the suction element 43 and the plunger 44, and the plunger 44 is biased downward in the valve-closing direction by the valve-closing spring 45.
A valve body holding hole 44a that holds the pilot valve body 31 and the valve receiving member 32 together is formed in a lower end portion of the plunger 44, and the valve receiving member 32 and the pilot valve body 31 are accommodated in the valve body holding hole 44a so as to be vertically overlapped with each other such that the valve receiving member 32 is located on the upper side and the pilot valve body 31 is located on the lower side. Then, after the annular retainer 34 abutting against the peripheral edge portion of the lower surface of the pilot valve body 31 is disposed on the lower surface of the pilot valve body 31, the lower end peripheral edge portion 44b (see fig. 2) of the valve body holding hole 44a is swaged and fixed to the retainer 34. The retainer 34 supports the lower surface peripheral edge portion of the pilot valve body 31 from below so as not to prevent the pilot valve body 31 from coming into contact with and separating from the pilot valve seat 25, thereby preventing the pilot valve body 31 and the valve receiving member 32 from coming off downward (out of the valve body holding hole 44 a).
In the present embodiment, a valve receiving spring 46 is provided on the upper surface portion of the valve receiving member 32 so as to be interposed between the valve receiving member 32 and the plunger 44. The valve receiving spring 46 is a compression coil spring that can relax the impact when the valve is closed (when the pilot valve core 31 is seated on the pilot valve seat 25), is accommodated in a compressed state in a hole 44c formed in the depth (upper surface center portion) of the valve body holding hole 44a, and biases the valve receiving member 32 and the pilot valve core 31 downward.
The pilot valve body 31 has a flat (planar) disk-like shape in both the upper surface 31a and the lower surface 31b, and the valve receiving member 32 disposed in contact with the upper surface 31a of the pilot valve body 31 is a disk-like member in which the upper surface 32a is flat (planar) and the lower surface 32b is a spherical surface protruding downward (toward the pilot valve body 31). Therefore, the valve receiving member 32 and the pilot valve core 31 come into contact with each other in a spherical surface (the lower surface 32b of the valve receiving member 32) and a flat surface (the upper surface 31a of the pilot valve core 31), and the point contact portion 33 according to the present invention is formed between the valve receiving member 32 and the pilot valve core 31. The spherical surface of the valve receiving member lower surface 32b can be formed by, for example, cutting. The operational effect of the point contact portion 33 will be described later in detail.
The operation of the solenoid valve 11 of the present embodiment will be described below.
In the valve-closed state shown in fig. 1, the pilot valve core 31 is seated on the pilot valve seat 25 and the pilot passage 24 is closed, so the internal pressure of the pilot valve chamber 27, which communicates with the main valve chamber 22 through the leveling passage, is equal to the main valve chamber 22, while the pressure in the valve port 17 is lower than the main valve chamber 22, and the main valve core 23 is seated on the main valve seat 18 by the differential pressure (to be precise, the difference between the pressure in the pilot valve chamber 27 and the pressure in the valve port 17), and the valve-closed state is maintained.
When the coil 41 of the electromagnetic actuator 13 is energized, the plunger 44 is attracted by the attraction element 43, and rises against the biasing force of the valve-closing spring 45, and the pilot valve core 31 is separated from the pilot valve seat 25, and the pilot passage 24 is opened. Accordingly, the refrigerant introduced into the pilot valve chamber 27 through the pressure equalizing passage is discharged to the outlet passage 16 through the pilot passage 24, and the pressure in the pilot valve chamber 27 decreases to be lower than the pressure in the main valve chamber 22 (inlet passage 15). Then, the main valve body 23 is lifted up by the differential pressure between the pilot valve chamber 27 and the main valve chamber 22 and the upward biasing force of the valve opening spring 26, and is brought into a valve-opened state in which the port 17 is opened, and the refrigerant (see an arrow F1) flowing into the main valve chamber 22 from the inflow passage 15 flows out from the main valve chamber 22 to the outflow passage 16 through the port 17 (see an arrow F2).
Further, since the pushed-up main valve body 23 is brought into contact with and stopped at the lower end peripheral edge portion 21c of the upper surface opening 21a of the valve main body 21, the pilot valve seat 25 at the center portion of the upper surface of the main valve body abuts against the lower surface of the pilot valve body 31, the pilot passage 24 is not closed, and the pilot passage 24 is maintained open.
On the other hand, when the energization of the coil 41 is stopped from the valve-opened state, the suction force of the suction element 43 disappears, and the plunger 44 is released from the suction element 43, whereby the plunger 44 is pushed back downward by the valve-closing spring 45, the pilot valve core 31 is seated on the pilot valve seat 25, and the pilot passage 24 is closed. Then, the refrigerant flowing into the pilot valve chamber 27 through the leveling passage is accumulated in the pilot valve chamber 27, so that the pressure in the pilot valve chamber 27 increases, the main valve body 23 is pushed down against the biasing force of the valve opening spring 26 by the differential pressure between the pilot valve chamber 27 and the main valve chamber 22, and the main valve body 23 is seated on the main valve seat 18, thereby being in a closed state in which the valve port 17 is closed (see fig. 1).
Here, referring to fig. 3 to 4, the operation and effect of the point contact portion 33 will be described, but in the conventional electromagnetic valve shown in fig. 4, when the valve is closed, the pilot valve core 31 and the plunger 44 contact each other in a plane (the contact portion is indicated by a reference numeral 33 a), and thus when the plunger 44 (the central axis of the plunger is indicated by a reference numeral A1) is tilted, the pilot valve core 31 is also tilted together. Therefore, in the conventional solenoid valve, a gap S is generated between the pilot valve seat 25 and the pilot valve core 31, and valve leakage occurs.
In contrast, according to the electromagnetic valve of the present embodiment, as shown in fig. 3, the valve receiving member 32 is interposed between the plunger 44 and the pilot valve core 31, and the valve receiving member 32 and the pilot valve core 31 contact each other via the point contact portion 33, so even if the plunger 44 tilts, the tilt is not transmitted to the pilot valve core 31, and the pilot valve core 31 is horizontally seated on the pilot valve seat 25. Therefore, no gap is generated between the pilot valve seat 25 and the pilot valve core 31, and valve leakage can be prevented.
A modified example of the present embodiment will be described.
In the above embodiment, as shown in fig. 5, the valve receiving member 32 may be provided with a projecting portion 32c that projects upward from the upper surface of the valve receiving member 32 and fits into the lower portion of the valve receiving spring 46. If such a protrusion 32c is provided, the valve receiving member 32 can be prevented from being displaced laterally, and the valve receiving member 32 and the pilot valve core 31 can be brought into contact with each other more stably. On the other hand, as shown in fig. 6, the plunger 44 may not have a valve receiving spring.
In addition, although a modification of the point contact portion 33 is described, the valve receiving member 32 may be manufactured by pressing a metal plate as shown in fig. 7. The valve receiving member 32 is formed by pressing a circular plate made of metal (a thin metal plate having a circular planar shape) so that a central portion thereof is depressed downward, thereby forming a convex curved surface portion protruding toward the pilot valve core 31. According to such a valve receiving member 32, the valve receiving member 32 can be manufactured in a shorter time and at a lower cost than the case where the valve receiving member 32 is formed by cutting as described above, and the manufacturing cost of the solenoid valve 11 can be reduced.
As shown in fig. 8, the same point contact portion 33 may be formed by making the lower surface of the plunger 44, that is, the top surface (upper surface) of the valve body holding hole 44a, which is a contact surface with the upper surface of the pilot valve core 31, a spherical surface projecting downward and making the spherical surface contact with the upper surface of the pilot valve core 31, without providing a valve receiving member.
In addition, as shown in fig. 9, the plunger 44 side may be a flat surface and the pilot valve body 31 side may be formed with a spherical surface, more specifically, the top surface of the valve body holding hole 44a may be a flat surface, and the upper surface 31a of the pilot valve body 31 may be a spherical surface protruding upward, so that the plunger 44 (the top surface of the valve holding hole 44 a) and the upper surface of the pilot valve body 31 are brought into contact with each other to form the point contact portion 33.
As shown in fig. 10, a spherical valve receiving member 32 may be disposed above the valve body holding hole 44a, and the point contact portion 33 may be formed similarly by providing the pilot valve body 31 in the valve body holding hole 44a of the plunger 44 so that the upper surface 31a of the pilot valve body 31 contacts the lower side of the spherical valve receiving member 32.
[ second embodiment ]
A solenoid valve according to a second embodiment of the present invention will be described with reference to fig. 11.
As shown in fig. 11, a solenoid valve 61 according to a second embodiment of the present invention is a normally closed type (normally closed type) solenoid valve in which a valve portion 12 for opening and closing a flow passage of refrigerant is driven by an electromagnetic actuator 13 as in the first embodiment, but is a direct-acting type solenoid valve in which a valve body 62 for opening and closing a flow passage of refrigerant is directly driven (not via a pilot valve) unlike the first embodiment.
Specifically, the solenoid valve 61 of the present embodiment includes, as the valve portion 12 that opens and closes the flow path of the refrigerant: a valve body 21 having a valve chamber 22 therein, an inflow passage 15 for allowing refrigerant to flow into the valve chamber 22, an outflow passage 16 for allowing refrigerant to flow out of the valve chamber 22, a valve port 17 formed between the outflow passage 16 and the valve chamber 22, a valve seat 18 formed on an upper surface portion of the valve port 17, and a valve body 62 for opening and closing the valve port 17 by moving forward and backward (moving up and down) with respect to the valve seat 18.
The inflow passage 15 is connected to a side surface of the valve main body 21 so as to communicate with the valve chamber 22. On the other hand, the outlet passage 16 is connected to the bottom surface (lower surface) of the valve main body 21 and communicates with the valve chamber 22 via a port 17, and the port 17 is formed to rise vertically upward from the bottom surface of the valve main body 21 into the valve chamber 22.
The electromagnetic valve 61 includes, as the electromagnetic actuator 13 for driving the valve portion 12: a coil 41 wound around the bobbin 42, an attracting element 43 disposed inside the coil 41, and a plunger 44 attracted to the attracting element 43 by a magnetic force generated by the coil 41. The bobbin 42 has a cylindrical portion at the center, and the suction element 43 and the plunger 44 are disposed in the cylindrical portion in a state of being housed in the bush 51.
The bush 51 is a bottomless and uncovered tubular member, and is fixed to the outer peripheral surface of the suction element 43 such that the upper surface is closed by the suction element 43, and is fixed to the upper portion of the valve main body 21 by inserting the lower end portion into the valve main body 21 from the upper surface opening 21a of the valve main body 21.
The plunger 44 is housed in the bush 51 (below the attracting member 43) so as to be slidable in the up-down direction. The plunger 44 has a spring housing hole 44d penetrating the center portion in the vertical direction and communicating with the valve body holding hole 44a at the lower end portion of the plunger, and a valve-closing spring 45 is provided in the spring housing hole 44 d. The valve closing spring 45 is a compression coil spring disposed in a compressed state between the valve receiving member 32 accommodated in the valve body holding hole 44a and the suction element 43, and biases the valve body 62 disposed in the valve body holding hole 44a downward (in a valve closing direction) via the valve receiving member 32.
The holding structure of the valve spool 62 and the valve receiving member 32 with respect to the plunger 44 is the same as that of the first embodiment. That is, the valve body 62 and the valve receiving member 32 are held in the valve body holding hole 44a at the lower end of the plunger by vertically housing the valve receiving member 32 and the valve body 62 in an overlapping manner such that the valve receiving member 32 is on the upper side and the valve body 62 is on the lower side, and caulking the lower end peripheral edge portion of the valve body holding hole 44a to fix the retainer ring 34.
In the present embodiment, the valve body 62 has a flat (planar) disk-like shape in both upper and lower surfaces, and the valve receiving member 32 disposed in contact with the upper surface of the valve body 62 is a disk-like member having a flat (planar) upper surface and a spherical lower surface projecting downward (toward the valve body 62), similarly to the pilot valve body 31 of the first embodiment. Therefore, a point contact portion 33 where a spherical surface (a lower surface of the valve receiving member 32) and a flat surface (an upper surface of the valve body 62) contact each other is formed between the valve receiving member 32 and the valve body 62.
In the present embodiment, the valve receiving member and the point contact portion between the valve receiving member and the valve body can be similarly applied to the modifications described in the first embodiment (fig. 5 and 6 to 10).
The operation of the solenoid valve 61 of the present embodiment will be described below.
In the valve-closed state shown in fig. 11, the valve-closing spring 45 pushes down the valve body 62 together with the plunger 44 via the valve receiving member 32, and the valve body 62 is pressed against the valve seat 18 to close the valve port 17.
When the coil 41 of the electromagnetic actuator 13 is energized, the plunger 44 is attracted by the attraction element 43 and rises against the biasing force of the valve closing spring 45, and the valve body 62 is lifted and separated from the valve seat 18, thereby being in a valve-opened state in which the valve port 17 is opened. Then, the refrigerant (see arrow F1) flowing into the valve chamber 22 from the inlet passage 15 flows out from the valve chamber 22 to the outlet passage 16 through the valve port 17 (see arrow F2).
On the other hand, when the energization of the coil 41 is stopped from the valve-opened state, the suction force of the suction element 43 disappears and the plunger 44 is released from the suction element 43, and the valve body 62 is pushed back downward by the valve-closing spring 45 together with the plunger 44 via the valve receiving member 32, whereby the valve body 62 is seated on the valve seat 18 and the valve port 17 is closed (see fig. 11).
In the solenoid valve 61 of the present embodiment, as in the solenoid valve 11 of the first embodiment, even if the plunger 44 tilts during the valve closing operation, the point contact portion 33 is formed between the valve receiving member 32 and the valve body 62, so that the tilt of the plunger 44 is not transmitted to the valve body 62, and the valve body 62 is seated on the valve seat 18 in a horizontal state, thereby preventing the occurrence of valve leakage.
While the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that those skilled in the art can make various modifications within the scope described in the claims.
For example, the embodiments described above are all valves of a normally closed type (normally closed type), but the present invention can be applied to valves of a normally open type (normally open type) as well. As described above, the present invention is not limited to the solenoid valve, and can be applied to an electrically operated valve driven by a motor. In the case of application to an electric valve, the valve receiving member 32 and the valve body 62 may be provided at the tip of an elevating member (for example, a valve shaft or a valve rod) as a movable body that moves up and down by an elevating device using a screw feed mechanism, and the pilot passage 24 may be opened and closed by the valve body 62.
The electric drive valve of the present invention can be preferably used in a refrigeration cycle apparatus having a refrigerant circuit such as a typical air conditioner (air conditioner), freezer, refrigerator, or the like, but is not limited thereto, and the electric drive valve of the present invention can be used in various other applications.
Claims (10)
1. An electrically driven valve is provided with:
a valve body having a main valve chamber and a pilot valve chamber therein;
an inflow passage through which a refrigerant flows into the main valve chamber;
an outflow passage through which the refrigerant flows out of the main valve chamber;
a valve port having a main valve seat and provided between the outflow passage and the main valve chamber in such a manner as to open at the main valve chamber;
a main valve element that opens and closes the valve port by moving forward and backward relative to the main valve seat;
a pilot passage that passes through the main spool and selectively communicates the pilot valve chamber with the outflow passage;
a pressure equalizing path which communicates the main valve chamber with the pilot valve chamber;
a pilot valve seat formed at an end of the pilot passage on the pilot valve chamber side;
a pilot valve element that moves forward and backward relative to the pilot valve seat to open and close the pilot passage;
a moving body that holds the pilot valve body and moves together with the pilot valve body;
a valve receiving member interposed between the pilot valve body and the movable body, the valve receiving member transmitting a pressing force for pressing the pilot valve body against the pilot valve seat to close the pilot passage to the pilot valve body; and
an electric drive device that drives the pilot spool via the moving body,
it is characterized in that the preparation method is characterized in that,
a point contact part where convex curved surfaces are contacted with a plane or a point contact part where convex curved surfaces are contacted with each other is formed between the pilot valve core and the valve receiving part,
the pressing force is transmitted from the valve receiving member to the pilot valve element via the point contact portion.
2. Electrically driven valve according to claim 1,
the valve receiving member is a plate-shaped member having a flat surface on a side contacting the movable body and a convex curved surface on a side contacting the pilot valve element.
3. Electrically driven valve according to claim 1,
the valve receiving member is a plate-like member having a center portion recessed toward the pilot valve core side to form a convex curved surface portion protruding toward the pilot valve core side.
4. Electrically driven valve according to claim 1,
the valve receiving member is a spherical member.
5. An electrically driven valve is provided with:
a valve body having a main valve chamber and a pilot valve chamber therein;
an inflow passage through which a refrigerant flows into the main valve chamber;
an outflow passage through which the refrigerant flows out of the main valve chamber;
a valve port having a main valve seat and provided between the outflow passage and the main valve chamber in such a manner as to open at the main valve chamber;
a main valve element that opens and closes the valve port by moving forward and backward relative to the main valve seat;
a pilot passage that passes through the main spool and selectively communicates the pilot valve chamber with the outflow passage;
a pressure equalizing path which communicates the main valve chamber with the pilot valve chamber;
a pilot valve seat formed at an end of the pilot passage on the pilot valve chamber side;
a pilot valve element that moves forward and backward relative to the pilot valve seat to open and close the pilot passage;
a moving member that holds the pilot valve element, moves together with the pilot valve element, and transmits a pressing force for pressing the pilot valve element against the pilot valve seat to close the pilot passage to the pilot valve element; and
an electric drive device that drives the pilot spool via the moving body,
it is characterized in that the preparation method is characterized in that,
a point contact portion where a convex curved surface and a flat surface contact each other or a point contact portion where convex curved surfaces contact each other is formed between the pilot valve element and the moving body,
the pressing force is transmitted from the moving body to the pilot valve element via the point contact portion.
6. An electrically driven valve is provided with:
a valve body having a valve chamber therein;
a first flow path that is one of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber;
a second flow path that is the other of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber;
a valve port that has a valve seat and is provided between the first flow path and the valve chamber or between the second flow path and the valve chamber so as to be opened in the valve chamber;
a valve element that moves back and forth relative to the valve seat between a valve-closed position in which the valve element is pressed against the valve seat by receiving a pressing force in a valve-closing direction to close the valve port and a valve-open position in which the valve element is separated from the valve seat to open the valve port;
a moving body that holds the valve body and moves together with the valve body;
a valve receiving member interposed between the movable body and the valve body, the valve receiving member transmitting the pressing force to the valve body; and
an electric drive device that drives the spool via the moving body,
it is characterized in that the preparation method is characterized in that,
a point contact part where convex curved surfaces are contacted with a plane or a point contact part where convex curved surfaces are contacted with each other is formed between the valve core and the valve receiving part,
the pressing force is transmitted from the valve receiving member to the valve body via the point contact portion.
7. Electrically driven valve according to claim 6,
the valve receiving member is a plate-shaped member having a flat surface on a side contacting the movable body and a convex curved surface on a side contacting the valve element.
8. Electrically actuated valve according to claim 6,
the valve receiving member is a plate-like member having a center portion recessed toward the valve element side to form a convex curved surface portion protruding toward the valve element side.
9. Electrically driven valve according to claim 6,
the valve receiving member is a spherical member.
10. An electrically driven valve is provided with:
a valve body having a valve chamber therein;
a first flow path that is one of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber;
a second flow path that is the other of an inflow path through which the refrigerant flows into the valve chamber and an outflow path through which the refrigerant flows out of the valve chamber;
a valve port that has a valve seat and is provided between the first flow path and the valve chamber or between the second flow path and the valve chamber so as to be opened in the valve chamber;
a valve element that moves back and forth relative to the valve seat between a valve-closed position in which the valve element is pressed against the valve seat by receiving a pressing force in a valve-closing direction to close the valve port and a valve-open position in which the valve element is separated from the valve seat to open the valve port;
a movable body that holds the valve element and moves together with the valve element; and
an electric drive device that drives the valve element via the moving body,
it is characterized in that the preparation method is characterized in that,
a point contact portion where convex curved surfaces contact a flat surface or a point contact portion where convex curved surfaces contact each other is formed between the valve element and the movable body,
the pressing force is transmitted from the movable body to the valve body via the point contact portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021213858A JP7487946B2 (en) | 2021-12-28 | 2021-12-28 | Electrically operated valve |
| JP2021-213858 | 2021-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218598827U true CN218598827U (en) | 2023-03-10 |
Family
ID=85399618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222416555.7U Active CN218598827U (en) | 2021-12-28 | 2022-09-13 | Electrically driven valve |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7487946B2 (en) |
| CN (1) | CN218598827U (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5679299B2 (en) | 2011-01-07 | 2015-03-04 | コフロック株式会社 | solenoid valve |
| JP6472376B2 (en) | 2015-12-28 | 2019-02-20 | 株式会社コム | solenoid valve |
| JP6857964B2 (en) | 2016-03-09 | 2021-04-14 | サンデン・オートモーティブクライメイトシステム株式会社 | Solenoid valve, refrigerating device using it, and air conditioner for vehicles using it |
| JP6563441B2 (en) | 2017-06-26 | 2019-08-21 | 株式会社不二工機 | Pilot operated solenoid valve |
-
2021
- 2021-12-28 JP JP2021213858A patent/JP7487946B2/en active Active
-
2022
- 2022-09-13 CN CN202222416555.7U patent/CN218598827U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023097639A (en) | 2023-07-10 |
| JP7487946B2 (en) | 2024-05-21 |
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