JP2011033126A - Three-way selector valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower the manufacturing cost and achieve compactness in a three-way selector valve, which is provided in a refrigerating cycle including a hot gas cycle, and adapted to select a high pressure passage for guiding refrigerant gas discharged by a compressor to a condenser or a by-pass passage for guiding the same to an evaporator by detouring around the condenser for switching between them. <P>SOLUTION: This three-way selector valve 1 includes: a solenoid valve 3 for opening and closing a by-pass passage between the compressor of the refrigerating cycle and the evaporator; and a differential pressure regulating valve 4 for closing the high pressure passage from the compressor to the condenser in the open state of the solenoid valve and opening the high pressure passage in the close state of the solenoid valve. Since the solenoid valve is disposed in the by-pass passage, large driving force is not required, so that a coil 35 can be reduced in size. A valve body 2 has a valve mounting hole 10 formed extending inward from one end, and the solenoid valve and the differential pressure regulating valve are inserted and mounted in series in the valve mounting hole. The valve mounting hole is sealed with one O-ring 32 disposed at the opening end side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is provided in a refrigeration cycle having a hot gas cycle, and selectively selects a refrigerant gas discharged from a compressor as either a high-pressure channel that leads to a condenser or a bypass channel that bypasses a condenser and leads to an evaporator. The present invention relates to a three-way switching valve for switching.

  In the winter season in cold regions, it is required that the heating operation is started up early with the air conditioning inside the vehicle. Conventional air conditioning and heating of a vehicle uses residual heat generated by an engine, and it takes time for the warm air to blow out into the vehicle. Moreover, recent improvements in engine thermal efficiency make it difficult for the engine to obtain residual heat that can be used for heating. In view of this, the heating start-up capability in the initial stage of air conditioning is improved by directly introducing high-temperature and high-pressure refrigerant gas (hot gas) generated by the compressor of the refrigeration cycle provided for cooling into the evaporator. It has been broken. In a refrigeration cycle having such a hot gas cycle, a three-way switching valve that selectively switches the refrigerant gas discharged from the compressor to either a flow path that leads to a condenser or a flow path that bypasses the condenser and leads to an evaporator. Is provided.

  As this type of three-way switching valve, in particular, a pilot-type solenoid valve and a differential pressure valve that are integrally provided have been proposed (see Patent Document 1). This three-way switching valve is composed of a pilot-type solenoid valve that opens and closes a high-pressure flow path between a compressor and a condenser, and a differential pressure valve that opens and closes a bypass flow path between the compressor and an evaporator in one valve body. It is integrated.

  The conventional three-way switching valve will be described with reference to FIGS. In FIG. 4, when the compressor 100 is operated with the electromagnetic valve 71 of the three-way switching valve 50 opened, the high-temperature and high-pressure gas is passed through the first passage 52, the valve seat 53, and the second passage 54 of the valve body 51. The refrigerant flows, and the gas refrigerant flows to the capacitor 200 via the high-pressure channel 400 (see FIG. 5). In this state, the pressure of the high-pressure gas refrigerant is also acting on both the chambers 62 and 63 of the differential pressure valve 61, and the first valve body 65 is pressed against the first valve seat 66 by the compression coil spring 64 and the evaporator. The inlet 67 to is closed. Therefore, the high-pressure gas refrigerant flowing from the compressor 100 into the chamber 62 via the flow path 68 is not supplied to the evaporator 200.

  In this state, when the electromagnetic coil 72 of the pilot electromagnetic valve 71 is energized from a control device (not shown), the plunger 73 pushes the compression coil spring 74 down by the electromagnetic attractive force and is attracted to the attractor 75. A pilot valve body 76 attached to the lower end abuts on a valve seat 78 provided on the upper portion of the valve body 77. As a result, the valve body 77 moves downward against the urging force of the compression coil spring 79, the packing 80 fixed to the lower surface of the valve body 77 contacts the valve seat 53, and the electromagnetic valve 71 is closed. . The contact portion between the lower end portion of the pilot valve body 76 and the valve seat 78 and the contact portion between the packing 80 and the valve seat 53 are sealed, and the high-temperature and high-pressure gas flows from the first passage 52 to the second passage 54. The refrigerant does not leak. As a result, the pressure in the chamber 63 of the differential pressure valve 61 is lowered, so that the first valve body 65 moves in the valve opening direction to leave the first valve seat 66 and the inlet 67 to the evaporator 300 is opened. Therefore, the high-temperature and high-pressure gas refrigerant flowing from the compressor 100 into the chamber 62 flows into the evaporator 300 through the bypass channel 500.

Japanese Patent No. 3413385

  In the conventional three-way switching valve, the electromagnetic valve 71 is used to open and close the high-pressure flow path 400 from the compressor 100 to the capacitor 200. However, in order to open and close the electromagnetic valve 71 against high pressure. Since the large electromagnetic coil 72 is required and the structure is a pilot type with a complicated structure, there is a problem that the cost is high and the occupied space is increased.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a three-way switching valve that has a simple structure, is inexpensive to manufacture, and can be made compact.

  The three-way switching valve according to the present invention is provided in a refrigeration cycle having a hot gas cycle, and is either a high-pressure flow path that guides refrigerant gas discharged from a compressor to a condenser or a bypass flow path that bypasses the condenser and leads to an evaporator. A three-way selector valve that selectively switches to a solenoid valve that opens and closes the bypass passage, and closes the high-pressure passage when the solenoid valve is open and closes the high-pressure passage when the solenoid valve is closed. A differential pressure valve configured to open a flow path, the valve body has a valve mounting hole formed inwardly from one end thereof, and the electromagnetic valve and the differential pressure valve are It is characterized by being inserted and mounted in series in the valve mounting hole.

Since the three-way switching valve according to the present invention is configured as described above, the following effects can be obtained.
(1) Since the diameter of the bypass flow path between the compressor and the evaporator is smaller than the diameter of the high pressure flow path between the compressor and the condenser, if an electromagnetic valve is provided in the bypass flow path, Compared with the case where an electromagnetic valve is provided, the orifice diameter is reduced and the refrigerant pressure is reduced, so that the drive coil can be made smaller. Further, when an electromagnetic valve is provided in the bypass flow path, a direct acting type can be adopted because the refrigerant pressure is low, and the configuration becomes simple compared to a case where a pilot type is adopted. Therefore, the manufacturing cost can be reduced and the size can be reduced to save space.
(2) Since the solenoid valve and the differential pressure valve can be assembled from one end side of the valve body, the workability during assembly is greater than when the solenoid valve and differential pressure valve are assembled from the top and side surfaces of the valve body as in the conventional example. It becomes good. In addition, since a place for providing a seal for preventing the refrigerant from leaking to the outside can be provided at only one place on the inlet side of the valve mounting hole, airtightness is improved, and the number of parts and the number of manufacturing steps are reduced.

It is front sectional drawing which shows one Example of the three-way selector valve by this invention. It is side surface sectional drawing of the principal part of the three-way selector valve shown in FIG. FIG. 3 is a bottom view of the three-way switching valve shown in FIGS. 1 and 2. It is front sectional drawing which shows an example of the conventional three-way switching valve. It is explanatory drawing of the refrigerating cycle provided with the hot gas cycle.

  An embodiment of a three-way switching valve according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, a three-way switching valve 1 according to the present invention is configured by incorporating a solenoid valve 3 and a differential pressure valve 4 in one valve body 2. In this example, the solenoid valve 3 is a direct acting type. The valve body 2 includes a first passage 5 connected to the compressor and a second passage 6 connected to a condenser (condenser). In this example, the first passage 5 and the second passage 6 are provided in parallel to each other so as to open on the same side surface of the valve body 2, but may be provided so as to open on different side surfaces. . The first passage 5 and the second passage 6 are connected in communication by a connection passage 7 extending in the vertical direction.

  A single valve mounting hole 10 is formed in the valve body 2 coaxially with the connection passage 7. The valve mounting hole 10 is a multi-stage one formed so as to be sequentially reduced in diameter from the upper surface side to the lower side of the valve body 2, and in order from the upper side, a first storage portion 11 (electromagnetic valve) that stores the electromagnetic valve 3. And a second accommodating portion 12 (differential pressure valve accommodating portion) for accommodating the differential pressure valve 4. The 1st accommodating part 11 and the 2nd accommodating part 12 are coaxial with the connection channel | path 7, and are formed in series. The second accommodating portion 12 communicates with the first accommodating portion 11 on the upper side and the connecting passage 7 on the lower side, and intersects the first passage 5. Thus, by forming the valve mounting hole 10 coaxially with the connection passage 7, processing becomes easy and productivity is improved.

  The electromagnetic valve 3 includes a valve body 30, a valve seat member 31 having a valve seat portion 31a, a coil 35 that is switched between an excited state and a non-excited state by an electric signal for driving, and an excited state and a non-excited state of the coil 35. A valve body 36 that moves in the vertical direction according to the excitation state and moves away from and in contact with the valve seat portion 31a is provided. The valve seat member 31 has a passage extending vertically, and the passage is opened and closed by the valve body 36 being separated from and contacting the valve seat portion 31a.

  The first housing portion 11 of the valve mounting hole 10 is formed with a large-diameter housing portion 11a that opens on the upper surface of the valve body 2, and is coaxial with the large-diameter housing portion 11a and downward from the large-diameter housing portion 11a. And a small-diameter accommodating portion 11b. The large-diameter accommodating portion 11a is for accommodating the valve main body 30 of the electromagnetic valve 3, and an internal thread portion is formed on the inner peripheral surface of the upper portion thereof. The female thread portion and the male thread portion formed on the outer periphery of the valve main body 30 constitute a screw engaging portion 13 for fixing the electromagnetic valve 3 to the valve main body 30. A circumferential groove is formed on the lower peripheral surface of the male threaded portion of the valve body 30, and an O-ring 32 as a seal member is fitted into the circumferential groove. The O-ring 32 is engaged with the cylindrical inner surface of the large-diameter accommodating portion 11a so as to prevent the refrigerant flowing inside the valve body 2 from leaking outside.

  The valve seat member 31 of the electromagnetic valve 3 accommodated in the small diameter accommodating portion 11b has a generally bottomed cylindrical shape, and its outer peripheral surface is sealed and engaged with the cylindrical inner surface of the small diameter accommodating portion 11b by an O-ring 33. is doing. The valve seat member 31 is formed with a plurality of through holes 34 penetrating in the radial direction, and the refrigerant pressure communicating with the evaporator acts on the inside of the valve seat member 31. The refrigerant pressure from the compressor acts on the space 37 around the valve body 36 above the valve seat member 31 through the first passage 5 to the passage 14, the large-diameter accommodating portion 11a, and the groove 31b at the upper end of the valve seat member 31. is doing. Further, the refrigerant pressure from the evaporator acts on the inside of the valve seat member 31 through the third passage 9 (see FIG. 2) and the through hole 34.

  The differential pressure valve 4 includes a valve main body 41, a bottomed cylindrical spring guide 43 fixed to the upper end thereof by caulking, and a coil spring 44 guided by the spring guide 43. The coil spring 44 urges the valve body 41 downward via the spring guide 43.

  The second housing portion 12 of the valve mounting hole 10 has a smaller diameter than the first housing portion 11 but is formed to have a larger diameter than the connection passage 7, and the valve main body 41 is slidably accommodated therein. At the position where the first passage 5 and the connection passage 7 intersect, a valve seat 8 on which a valve portion 42 provided at the lowermost part of the valve body 41 can be seated is provided.

  When the electromagnetic valve 3 is opened, the refrigerant from the compressor flows into the valve seat member 31 and is supplied to the evaporator through the through hole 34 and the third passage 9. Further, since the pressure difference between the upper and lower portions of the valve body 41 is eliminated, the valve body 41 is pushed down by the coil spring 44, the valve portion 42 is seated on the valve seat 8, and the refrigerant flow from the compressor to the condenser is blocked. On the other hand, when the electromagnetic valve 3 is closed, the refrigerant from the compressor does not flow into the valve seat member 31 and is not supplied to the evaporator. Further, when the pressure difference between the top and bottom of the valve body 41 gradually increases and the pressure difference becomes a certain level or more, the valve body 41 moves in the opening direction and moves away from the valve seat 8 so that the refrigerant from the compressor flows. It flows to the capacitor through the connection passage 7 and the second passage 6.

  As described above, the valve mounting hole 10 is formed in a multi-stage hole whose diameter decreases from the upper side of the valve body 2, and the differential pressure valve 4 and the electromagnetic valve 3 are valve mounting holes from the upper side of the valve body 2. 10 are sequentially assembled. Thus, since the differential pressure valve 4 and the electromagnetic valve 3 can be assembled from one direction, the assemblability is good. Alternatively, the differential pressure valve 4 and the electromagnetic valve 3 can be assembled in advance as a unit and assembled to the valve body 2 at a time. Therefore, the assemblability can be greatly improved as compared with the conventional case. Further, since there is one valve mounting hole 10, leakage of the refrigerant can be prevented by one O-ring 32, so that the number of parts can be reduced and the sealing performance can be improved.

In the above description of the embodiment, the case where the electromagnetic valve 3 is a direct acting type has been described, but it is obvious that a pilot type electromagnetic valve as shown in the conventional example may be used instead. It is.
In addition, various modifications can be made to the above embodiment without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Three-way selector valve 2 Valve body 3 Electromagnetic valve 4 Differential pressure valve 5 1st channel | path 6 2nd channel | path 7 Connection channel | path 8 Valve seat 9 3rd channel | path 10 Valve mounting hole 11 1st accommodating part (electromagnetic valve accommodating part) 12 Second housing part (differential pressure valve housing part)
32 O-ring 35 coil

Claims (4)

  A three-way selector valve that is installed in a refrigeration cycle with a hot gas cycle and selectively switches the refrigerant gas discharged from the compressor to either a high-pressure channel that leads to the condenser or a bypass channel that bypasses the condenser and leads to the evaporator An electromagnetic valve that opens and closes the bypass flow path, and is configured to close the high pressure flow path with the electromagnetic valve open and open the high pressure flow path with the electromagnetic valve closed. The valve body has a valve mounting hole formed inwardly from one end thereof, and the solenoid valve and the differential pressure valve are inserted in series into the valve mounting hole. A three-way switching valve characterized by being mounted.   The valve body includes a first passage connected to the compressor, a second passage connected to the capacitor, and a connection passage connecting the first passage and the second passage, The valve mounting hole has a multi-stage shape that gradually decreases in diameter toward the inside, and is coaxial with the connection passage at the intersection of the first passage and the connection passage and has a diameter larger than that of the connection passage. A differential pressure valve housing portion is formed, and an electromagnetic valve housing portion coaxial with the differential pressure valve housing portion and having a larger diameter than the differential pressure valve housing portion is formed on the opening side of the differential pressure valve housing portion. The three-way switching valve according to claim 1.   The three-way switching valve according to claim 1 or 2, wherein the valve mounting hole is sealed by one O-ring disposed on the opening end side thereof.   The three-way switching valve according to any one of claims 1 to 3, wherein the solenoid valve is a direct acting type.

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