CN109578616A

CN109578616A - Six direction changeover valves

Info

Publication number: CN109578616A
Application number: CN201810876007.8A
Authority: CN
Inventors: 田渕健资; 藤田尚敬; 森田纪幸
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2017-09-29
Filing date: 2018-08-03
Publication date: 2019-04-05
Anticipated expiration: 2038-08-03
Also published as: JP2019065895A; JP6515163B2; CN109578616B

Abstract

Present invention offer makes valve be difficult to leak and effectively inhibit six direction changeover valves of the pressure loss.Three ports (pB, pA, pF) are on the direction axis (O) and row of openings, in the side opposite relative to axis of these three ports, the other three port (pC, pD, pE) is in the axial direction and row of openings, it is equipped with the first U-shaped in main valve plug (15) and turns to access (16A) and the second U-shaped steering access (16B), make main valve plug mobile, in main valve chamber so as to selectively obtain the first connected state and the second connected state.Main valve plug has the first sliding valve core (15A) and the second sliding valve core (15B) of tubular, second sliding valve core has the fitting projection (15b) for being sliding freely embedded in first sliding valve core in left side, by embedding fitting projection in the first sliding valve core, to which by the left side of the inner peripheral surface of the first sliding valve core and fitting projection, zoning forms the first U-shaped and turns to access.

Description

Six direction changeover valves

Technical field

The present invention relates to by making mobile six direction changeover valves to carry out the switching of flow path of spool, in particular to it is suitable as Six direction changeover valves of the flow channel switching valve of flow path switching are carried out in heat pump type refrigerating heating system etc..

Background technique

Generally, the heat pump type refrigerating heating system of room air conditioner, air conditioning for automobiles etc. have compressor, outdoor heat exchanger, Other than indoor heat exchanger and expansion valve etc., it is also equipped with the flow channel switching valve as flow path (flow direction) switch means.

As this flow channel switching valve, there is known four-way switching valves, but can replace, and consider to use six direction changeover valves.

Hereinafter, briefly describing the one of the heat pump type refrigerating heating system for having six direction changeover valves referring to Fig. 9 (A), (B) Example.The heat pump type refrigerating heating system 100 of illustrated example carries out operation mode (refrigeration operation and heating by six direction changeover valves 180 Operating) switching, substantially have: compressor 110, outdoor heat exchanger 120, indoor heat exchanger 130, cooling expansion valve 150 and heating use expansion valve 160, between them configuration tool there are six port pA, pB, pC, pD, pE, pF six direction changeover valves 180。

By the flow path connection by formation such as conduits (pipe) between each equipment, when selecting cooling operation pattern, such as Shown in Fig. 9 (A), the refrigerant of the high temperature and pressure being discharged from compressor 110 is from the port pA of six direction changeover valves 180 via port pB It is imported into outdoor heat exchanger 120, heat exchange is carried out with outdoor air herein and condenses, become the gas-liquid two-phase or liquid phase of high pressure Refrigerant is imported into cooling expansion valve 150.The refrigerant of high pressure is depressurized by the cooling expansion valve 150, is depressurized The refrigerant of low pressure afterwards imports indoor heat exchanger 130 via port pF from the port pE of six direction changeover valves 180, herein with room Interior air carries out heat exchange (refrigeration) and evaporates, and the refrigerant of the low-temp low-pressure from indoor heat exchanger 130 leads to switching from six The port pC of valve 180 returns to the suction side of compressor 110 via port pD.

In contrast, when selecting heating mode of operation, as shown in Fig. 9 (B), from the high temperature and pressure of the discharge of compressor 110 Refrigerant be imported into indoor heat exchanger 130 via port pF from the port pA of six direction changeover valves 180, herein with room air Carry out heat exchange (heating) and condense, become high pressure gas-liquid two-phase or liquid phase refrigerant and be imported into heating expansion valve 160. It is depressurized by the heating with refrigerant of the expansion valve 160 to high pressure, the refrigerant of the low pressure after decompression is from six direction changeover valves 180 port pC is imported into outdoor heat exchanger 120 via port pB, carries out heat exchange with outdoor air herein and evaporates, and comes It returns and compresses via port pD from the port pE of six direction changeover valves 180 from the refrigerant of the low-temp low-pressure of outdoor heat exchanger 120 The suction side of machine 110.

Enter six direction changeover valves of heat pump type refrigerating heating system as described above as group, it is known that such as 1 institute of patent document State six direction changeover valves of such slidingtype.Six direction changeover valves of the slidingtype have the valve body of built-in slidingtype main valve plug The pilot valve (four-way pilot valve) of (main valve shell) and electromagnetic type is equipped with the port pA~pF in main valve shell, and slides Formula main valve plug is configured to slide in the lateral direction.Movement there are two being set in the left and right of the slidingtype main valve plug of main valve shell Room, two operating chambers are connect via pilot valve and with compressor discharge side and compressor suction side, and respectively by combining It is formed, is selectively carried out from the pilot valve dynamic to this two in the pair of right and left piston-type gasket zoning of slidingtype main valve plug Make importing, the discharge of the high-pressure fluid (refrigerant) of room, slidingtype main valve plug described in the pressure official post using two operating chambers It slides in left-right direction, to carry out the flow path switching.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 8-170864 bulletin

Subject to be solved by the invention

In previous flow channel switching valve as described above, there is the project to be solved as follows.

That is, five ends in six direction changeover valves of the slidingtype described in patent document 1, in six port pA~pF Mouth pB~pF is set side by side in the axial direction, therefore is equipped with main valve seat, the slidingtype main valve plug (axis of five port pB~pF On line direction) it is elongated, it is difficult to ensure with valve seat, the slidingtype main valve of the main valve seat that slidingtype main valve plug sliding freely docks The face precision (flatness) of the sealing surface of core has and leaks (valve leakage) increased worry caused by initial stage leakage, durable deterioration.

In addition, in the lesser main valve shell of internal volume, the collision such as high-pressure fluid (refrigerant) and inner wall, and it is flowed The harm for being significantlyd change in crank-like, therefore thering is the pressure loss to become larger.

Except above-mentioned points, it in previous flow channel switching valve, is especially used in the heat pump type refrigerating heating system Flow channel switching valve in, in main valve shell, the refrigerant of high temperature and pressure is (from port pA to port pB, from port pA to port The refrigerant of pF flowing) and low-temp low-pressure refrigerant (from port pC to port pD, the refrigeration flowed from port pE to port pD Agent) it is flowed with close state.Specifically, the refrigerant of the refrigerant and low-temp low-pressure of high temperature and pressure is passed through in refrigeration operation It is flowed by main valve seat in adjacent port pB and port pC, in heating operation via main valve seat in adjacent port pF and port PC flowing, but the main valve seat for being equipped with each port is generally made by the high metal of pyroconductivity, therefore the heat exchange between them The problem of amount (that is, heat loss) becomes larger, and also systematic efficiency deteriorates.

Summary of the invention

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a kind of six direction changeover valves, can be difficult to make Valve leakage, and effectively inhibit the pressure loss.

In addition, other objects of the present invention are to provide a kind of flow channel switching valve, in heat pump type refrigerating heating system etc. In the environment of the fluid flowing of the fluid and low-temp low-pressure of high temperature and pressure in the case where use, it can reduce heat loss and make heat pump The efficiency of formula refrigerating and heating systems improves.

Means for solving the problems

In order to reach the purpose, six direction changeover valves of the invention substantially have: the main valve shell of tubular, the main valve Shell zoning forms main valve chamber；Port sets that there are six the ports the main valve shell is total；And the main valve plug of slidingtype, it should Main valve plug is configured to move in the axial direction in the main valve chamber, is equipped in the main valve plug for selectively will The multiple access being connected between the port can make to be cut between the port being connected to and keeping the main valve plug mobile It changes, which is characterized in that, three ports are abreast open to the main valve chamber in the axial direction, and in institute The side opposite relative to axis of three ports is stated, other three ports are abreast opened to the main valve chamber in the axial direction Mouthful, the main valve plug has the high-pressure side sliding valve core of low-pressure side sliding valve core and tubular, and the low-pressure side sliding valve core is in side Face has the fitting projection for being sliding freely embedded in the high-pressure side sliding valve core, embeds institute in the high-pressure side sliding valve core Fitting projection is stated, so that by the inner peripheral surface of the high-pressure side sliding valve core and the end face of the fitting projection, zoning forms height Side U-shaped is pressed to turn to access, which, which turns to access, is selectively connected to two ports in three ports, and And the high-pressure side U-shaped turns to the fluid that access is imported into relatively high pressure, the high-pressure side sliding valve core and the low pressure Slideslip Spool integrally moves freely in the axial direction, and slides over each other on direction perpendicular to the axis freely and the low pressure The another side of sideslip movable valve plug offers low-pressure side U-shaped and turns to access, and low-pressure side U-shaped steering access selectively makes described Two ports connection in other three ports, and the low-pressure side U-shaped turns to the fluid that access is imported into relatively low pressure, in institute Stating makes the main valve plug mobile in main valve chamber, so as to selectively obtain following multiple connected states: making three ends Two ports in mouthful turn to access connection via the high-pressure side U-shaped, make two ports warp in other described three ports Access connection is turned to by the low-pressure side U-shaped, makes other a ports and described other three ends in three ports Other a ports in mouthful in the main valve shell by being connected to.

In a preferred manner, in the fitting projection of the high-pressure side sliding valve core and the low-pressure side sliding valve core Between be configured with cricoid seal member.

In another preferred mode, the ring of the high-pressure side sliding valve core of the main valve seat side equipped with three ports The shape of shape sealing surface is less than the shape of the seal member.

The main valve seat side equipped with three ports in another preferred mode, in the high-pressure side sliding valve core End inner circumferential be equipped with inward flange shape portion, be formed with the annular sealing surface in the end face of the main valve seat side in the inward flange shape portion.

In other preferred modes, configures and apply between the high-pressure side sliding valve core and the low-pressure side sliding valve core Power component, the force application part apply the high-pressure side sliding valve core and the low-pressure side sliding valve core in the opposite directions to each other Power.

In another preferred mode, the force application part is configured in the outside of the seal member.

In other preferred modes, the area of passage that the low-pressure side U-shaped turns to access turns greater than the high-pressure side U-shaped To the area of passage of access.

In other preferred modes, the guide surface being made of bowl-like depression is formed in the end face of the fitting projection, The guide surface keeps the flowing of the fluid of the high pressure in the high-pressure side U-shaped steering access smooth.

In other preferred modes, the one end and another side of the main valve chamber in the main valve shell are equipped with The first operating chamber and the second operating chamber of volume-variable, first operating chamber and the second operating chamber are by a pair of of first piston and second Piston zoning is formed, and is selectively introduced, is discharged high-pressure fluid, the main valve plug be configured to the first piston and Second piston is interlocked and is moved freely in the axial direction, and control high-pressure fluid is acted relative to first operating chamber and second The importing of room is discharged and keeps the first piston and second piston mobile, so that the main valve plug be made to move in the main valve chamber It is dynamic.

In another preferred mode, the first piston and the second piston are connected to by union body can be integrated Mobile, the union body is by being configured at and one or more pieces plates equipped with the orthogonal direction of the valve seat of main valve seat of the port It constituting, the main valve plug is sliding freely supported on the union body on the direction orthogonal with the valve seat of the main valve seat, And it is moved with the round-trip of the first piston and second piston.

In another preferred mode, the union body be equipped with retainer, the retainer carry out the main valve plug to The mobile limitation of axis direction.

In another preferred mode, the retainer is abutted with the main valve shell.

Invention effect

In six direction changeover valves of the invention, three ports is made abreast to be open in the axial direction to main valve chamber, and In the side opposite relative to axis of three ports, other three ports are abreast opened to main valve chamber in the axial direction Mouthful, it is equipped with high-pressure side U-shaped in main valve plug and turns to access and low-pressure side U-shaped steering access, which turns to access selection Property be connected to two ports in three ports and be imported into the fluid of relatively high pressure, which turns to access choosing It is connected to selecting property two ports in other three ports and is imported into the fluid of relatively low pressure, main valve is made in main valve chamber Core is mobile, so as to obtain following multiple connected states (flow path): making two ports in three ports via high-pressure side U-shaped Access connection is turned to, so that two ports in other three ports is turned to access connection via low-pressure side U-shaped, makes in three ports Other a ports and other a ports in other three ports by being connected in main valve shell.Therefore, with make It is compared with six direction changeover valves of previous slidingtype main valve plug, main valve seat, main valve plug (axis direction equipped with port can be made On) shorten, therefore it is easy to ensure that the valve seat of main valve seat, the sealing surface of main valve plug face precision (flatness), check valve leakage, And fluid (such as high-pressure fluid (refrigerant)) turns to flow channels, therefore the loss that can also reduce pressure via U-shaped.

On the basis of above-mentioned, the height of heat pump type refrigerating heating system etc. is used in six direction changeover valves by present embodiment In the case where the environment of the refrigerant flowing of the refrigerant and low-temp low-pressure of warm high pressure, the high pressure of the refrigerant flowing of high temperature and pressure The low-pressure side U-shaped that side U-shaped turns to the refrigerant flowing of access and low-temp low-pressure turns to access not via for example metal main valve Seat and be set as separation farther out, therefore compared to the refrigerant of the refrigerant of high temperature and pressure and low-temp low-pressure via metal master Valve seat and with the previous structure that close state flows, the heat exchange amount (that is, heat loss) between them can be greatly reduced, It is thus possible to access this effect of the efficiency of raising system.

In addition, there is main valve plug the high-pressure side sliding valve core of tubular and low pressure to break away in six direction changeover valves of the invention Movable valve plug, which has in one side (side of high-pressure side sliding valve core side) is sliding freely embedded in the height The fitting projection for pressing sideslip movable valve plug, in high-pressure side, sliding valve core embeds fitting projection, to pass through high-pressure side sliding valve core The end face of inner peripheral surface and fitting projection, zoning form the high-pressure side U-shaped and turn to access, therefore by importing the high-pressure side U-shaped Low-pressure side sliding valve core is pressed (crimping) in the main valve seat for being equipped with port by the high-pressure fluid (fluid pressure) for turning to access.Cause This, is able to suppress the figure (in particular, size with the direction of axis vertical take-off) of main valve plug, while more effectively check valve is let out Leakage.

In addition, the shape for being equipped with the annular sealing surface of the high-pressure side sliding valve core of the main valve seat side of three ports is less than It is configured at the shape of the seal member between high-pressure side sliding valve core and the fitting projection of low-pressure side sliding valve core, therefore, is utilized The differential pressure that the high-pressure side sliding valve core is acted on caused by the difference of the compression area of high-pressure side sliding valve core, by high-pressure side slide-valve Core presses (crimping) in the main valve seat for being equipped with port, therefore, thus also can more effectively check valve leak.

Project, structure and function and effect other than the above are become apparent from by the following embodiments and the accompanying drawings.

Detailed description of the invention

Fig. 1 is the vertical of the first connected state (when refrigeration operation) for the embodiment for indicating six direction changeover valves of the invention Cross-sectional view.

Fig. 2 is the vertical of the second connected state (when heating operation) for the embodiment for indicating six direction changeover valves of the invention Cross-sectional view.

Fig. 3 is the major part amplification longitudinal section view for the major part that amplification indicates six direction changeover valve shown in FIG. 1.

Fig. 4 is the cross-sectional view of the U-U arrow line along Fig. 1.

Fig. 5 is the main valve plug for the embodiment for indicating six direction changeover valves of the invention and the perspective view of union body.

Fig. 6 is the figure of four-way pilot valve used in amplification expression six direction changeover valves of the invention, and (A) is to indicate it is first The longitudinal section view of connected state (when refrigeration operation) (when energization disconnects), (B) is to indicate the second connected state (when heating operation) The longitudinal section view of (when energization is connected).

Fig. 7 is the major part amplification vertical profile for other the major part that amplification indicates six direction changeover valve shown in FIG. 1 View.

Fig. 8 be amplification indicate six direction changeover valve shown in FIG. 1 it is another other major part major part amplification Longitudinal section view.

Fig. 9 is to use six direction changeover valves as the outline structure of an example of the heat pump type refrigerating heating system of flow channel switching valve Figure, (A) is schematic structural diagram when indicating refrigeration operation, and (B) is schematic structural diagram when indicating heating operation.

Symbol description

1 six direction changeover valves

10 six-way valve main bodys

11 main valve shells

11A upper end side cover

11B lower end side cover

11a first piston portion

11b second piston portion

11c body portion

12 main valve chambers

13 first main valve seats (valve seat)

14 second main valve seats (valve seat)

15 main valve plugs

The first sliding valve core of 15A (high-pressure side sliding valve core)

The second sliding valve core of 15B (low-pressure side sliding valve core)

The inward flange shape portion of the first sliding valve core of 15a

The fitting projection of the second sliding valve core of 15b

The guide surface of the second sliding valve core of 15c

15e concave face

The first U-shaped of 16A turns to access (high-pressure side U-shaped turns to access) (access)

The second U-shaped of 16B turns to access (low-pressure side U-shaped turns to access) (access)

18 O-rings (cricoid seal member)

21 first pistons

22 second pistons

25 union bodies

25A, 25B a pair of link plate

25a web portion

25aa shift plate portion

25ab buttcover plate portion

25b installs foot

25c supporting board

The retainer of 25s union body

31 first operating chambers

32 second operating chambers

90 four-way pilot valves

The port pA, pB, pC, pD, pE, pF

Specific embodiment

Hereinafter, the embodiments of the present invention will be described with reference to the drawings.

Fig. 1 and Fig. 2 is the longitudinal section view for indicating an embodiment of six direction changeover valves of the invention, and Fig. 1 is to indicate The figure of one connected state (when refrigeration operation), Fig. 2 are the figures for indicating the second connected state (when heating operation).

In addition, in the present specification, indicating that the statement of the position, direction of top to bottom, left and right, front and rear etc. is in order to avoid explanation Become cumbersome and marked for convenience's sake according to attached drawing, is not limited to refer to that actually group enters heat pump type refrigerating heating system etc. Position, direction under state.

In addition, in the various figures, the spacing distance etc. between the gap that is formed between component, component is for easy understanding to send out It is bright, facilitate mapping in addition to realizing, describes sometimes more than or less than the size of each structure member.

Six direction changeover valves 1 of illustrated embodiment are as heat pump type refrigerating system shown in Fig. 9 (A) for example above-mentioned, (B) The structure for the slidingtype that six direction changeover valves 180 in hot systems use, substantially has: the six-way valve main body 10 and work of cylinder type For the single electromagnetic type four-way pilot valve 90 of pilot valve.In addition, six ends that six direction changeover valves 1 of present embodiment have Mouth is corresponding with each port pA~pF of above-mentioned six direction changeover valve 180 and marks the same symbol.

[structure of six-way valve main body 10]

Six-way valve main body 10 has the main valve shell 11 of the metal tubulars such as brass or stainless steel, in the main valve shell 11 In, the first operating chamber 31, first piston 21, main valve chamber 12, second piston 22 and are configured in order from one end (upper end side) Two operating chambers 32.In described first and second piston 21,22, in order to airtightly separate main valve shell 11, in main valve shell The inner peripheral surface of body 11 is equipped with the band spring shim crimped with its peripheral part.

Specifically, main valve shell 11 has the body portion 11c compared with major diameter, is airtightly being installed on body portion 11c's The disk-shaped upside connection lid 11d of the heavy wall of upper end opening portion is equipped with medium pore, first be made of (smaller radial) pipe portion part Piston portion 11a is airtightly fixed on the medium pore by soldering etc., configures the first piston 21 in the first piston portion 11a. Similarly, center is equipped in the disk-shaped downside connection lid 11e of the heavy wall for the lower end opening portion for being airtightly installed on body portion 11c Hole, the second piston portion 11b being made of (smaller radial) pipe portion part are airtightly fixed on the medium pore by being brazed etc., this Two piston portion 11b configure the second piston 22.

In the upper end of main valve shell 11 (first piston portion 11a), by being brazed etc., to be airtightly fixed with thin-walled disk-shaped Upper end side cover 11A, which forms the first operating chamber 31 of volume-variable, in main valve shell 11 The lower end of (second piston portion 11b) is airtightly fixed with the disk-shaped lower end side cover 11B of thin-walled by being brazed etc., under this Second operating chamber 32 of end side cover 11B zoning formation volume-variable.For to the first operating chamber 31 and the second operating chamber 32 import, port p11, p12 of discharge high-pressure fluid (refrigerant) are respectively arranged in upper end side cover 11A and lower end side cover Component 11B (center).

It is equipped in the main valve shell 11 (main valve chamber 12) and adds up to six ports.

Specifically, in the left part center of the main valve chamber 12, surface (right side) is such as metal of flat valve seat The first main valve seat (valve seat) 13 of system is airtightly fixed on the body portion 11c (inner circumferential) of main valve shell 11 by soldering etc., The valve seat of first main valve seat 13, three be made of pipe fitting the port extended to the left (are followed successively by port from upper end side PB, port pA, port pF) it longitudinal arrangement (being arranged on axes O direction) and is substantially open at equal intervals.

In addition, the main valve chamber 12 right part center (position opposite with the first main valve seat 13, in other words, relative to Axes O is located at the position of the side opposite with the first main valve seat 13), surface (left side) is such as made of metal of flat valve seat The second main valve seat (valve seat) 14 be airtightly fixed on the body portion 11c (inner circumferential) of main valve shell 11 by being brazed etc., at this The valve seat of second main valve seat 14, three be made of pipe fitting the port extended to the right (from upper end side be followed successively by port pC, Port pD, port pE) it longitudinal arrangement (being arranged on axes O direction) and is substantially open at equal intervals.

It is set to each port (port pB, port pA, port pF) of the first main valve seat 13 and is set to the second main valve seat 14 Each port (port pC, port pD, port pE) be set in opposite position (relative to axes O opposite side), and this In example, the bore for being set to each port pA~pF of the first main valve seat 13 and the second main valve seat 14 is set at essentially identical mouth Diameter.

In the main valve chamber 12, specifically, there is runway-shaped ring-type in the body portion 11c of main valve shell 11 The main valve plug 15 of the rectangular-shaped slidingtype in the section of sealing surface can movably be configured along axes O direction (up and down direction), main valve It is slided respectively with the valve seat of first main valve seat 13 and the second main valve seat 14 two sides (left side and the right side) of core 15 It docks freely.In this example, the left and right directions of main valve plug 15 and in the front-back direction size be equal to or slightly greater than the main valve shell The outer diameter of the first piston portion 11a and second piston portion 11b of body 11.

The main valve plug 15 is such as synthetic resin system, is substantially set as following two components: 13 side of the first main valve seat The second sliding valve core of first sliding valve core (high-pressure side sliding valve core) 15A and 14 side of the second main valve seat (right side) in (left side) (low-pressure side sliding valve core) 15B.

First sliding valve core 15A has tubular, at its left part (end of the side opposite with the second side sliding valve core 15B Portion) inner circumferential (inwardly) be provided projectingly zoning formed as under shed inward flange shape portion 15a, the size of the opening is can to select Make to selecting property adjacent two port (port pB and the port in three ports that the valve seat of the first main valve seat 13 is open The size that pA or port pA are connected to port pF).Left side (the end of 13 side of the first main valve seat of inward flange shape portion 15a Face) it is set as the annular sealing surface sliding freely docked with the valve seat of first main valve seat 13.

On the other hand, it is opened up in the right side side of the second sliding valve core 15B (side opposite with the first side sliding valve core 15A) There is the second U-shaped being made of bowl shaped depression to turn to access (low-pressure side U-shaped turns to access) (access) 16B, which turns to The size of access 16B is adjacent two that can selectively make in three ports that the valve seat of the second main valve seat 14 is open A port (size that port pC and port pD or port pD are connected to port pE), and on a left side of the second sliding valve core 15B Face (side of the first side sliding valve core 15A) (to the left), which is extended, fitting projection 15b, and fitting projection 15b has and institute State roughly the same or more slightly smaller than its shape of the interior shape of the first sliding valve core 15A of tubular.

The fitting projection 15b of the second sliding valve core 15B sliding freely (is being set to fitting projection 15b and first Step part between sliding valve core 15A clips O-ring 18) it is embedded in the first (right side sliding valve core 15A of the tubular Point), so that it is logical to form the steering of the first U-shaped by the inner peripheral surface of the first sliding valve core 15A and the left side zoning of fitting projection 15b Road (high-pressure side U-shaped turns to access) (access) 16A, which, which turns to access 16A, can selectively make in the first main valve Adjacent two port (port pB and port pA or port pA and port in three ports of the valve seat opening of seat 13 PF) be connected to, and the first sliding valve core 15A and the second sliding valve core 15B in left and right directions (direction vertical with axes O, and It is each port (port pB, port pA, port pF) for being set to the first main valve seat 13 and each end for being set to the second main valve seat 14 The opposite direction of mouth (port pC, port pD, port pE), that is, the valve seat with the first main valve seat 13 and the second main valve seat 14 Orthogonal direction) on slightly move freely each other, and integrally moved freely on (axes O direction) in above-below direction.

In illustrated example, the right end side inner circumferential for being formed in the first sliding valve core 15A stage portion (inner circumferential stage portion) with It is formed between the stage portion (periphery stage portion) of the periphery of the fitting projection 15b of the second sliding valve core 15B and sets into there is O-ring 18 As cricoid seal member.In addition, replacing O-ring 18, naturally it is also possible to use the seal member of lippacking etc..

Therefore, in than the O-ring 18 part in the inner part, from port (discharge side high pressure port) pA via the first U Shape turns to access 16A and imports high-pressure fluid (refrigerant), which turns to access 16A and main valve chamber 12 by being configured at it Between the O-ring 18 seal (closing).

Here, referring to Fig.1, Fig. 2 and Fig. 3 be on (direction vertical with axes O) it is found that observe, first in left and right directions The compression area Sb of the right side side of sliding valve core 15A is greater than the compression area Sa of left side side (13 side of the first main valve seat).

More specifically, the inside of the O-ring 18 relative to the plane vertical with left and right directions projected area and by The left of the high-pressure refrigerant in access 16A and the first sliding valve core 15A (right side) receiving is turned in importing first U-shaped To pressure face projected area (compression area Sb) be greater than 13 side of the first main valve seat annular sealing surface relative to The projected area of the vertical plane of left and right directions (that is, the area roughly the same with the projected area of inward flange shape portion 15a herein) And the high-pressure refrigerant due to flowing in port (inside of annular sealing surface) and the first sliding valve core 15A (left side) are born The projected area (compression area Sa) in the face of the pressure of right direction.

Access 16A importing high-pressure refrigerant is being turned to the first U-shaped via port (discharge side high pressure port) pA as a result, When, (more specifically, turned from the first U-shaped by turning to the pressure that access 16A (high-pressure refrigerant) is subject to from the first U-shaped The pressure that the refrigerant (high-pressure refrigerant) flowed to access 16A is subject to turns to the refrigeration that access 16B flows with from the second U-shaped The differential pressure for the pressure that agent (low pressure refrigerant) is subject to), the right side (annular sealing surface) of the second sliding valve core 15B is pressed against The valve seat of two main valve seats 14, and the difference (Sb- of the compression area by the right side side and left side side of the first sliding valve core 15A Sa the differential pressure of first sliding valve core 15A, the left side (annular sealing surface) quilt of the first sliding valve core 15A are acted on caused by) Press on the valve seat of the first main valve seat 13.

Alternatively, it is also possible to be, between the first sliding valve core 15A and the second sliding valve core 15B, such as in O-ring 18 Outside and the right side of the first sliding valve core 15A and formed the second sliding valve core 15B fitting projection 15b step surface (to the left Step surface) between configure force application part (cricoid flat spring, compression helical spring etc.), the force application part is to the first slide-valve Opposite direction (detaching direction) exerts a force core 15A and the second sliding valve core 15B to each other, as a result, by a left side of the first sliding valve core 15A Face (annular sealing surface) crimps (pressing) in the valve seat of the first main valve seat 13, and the second sliding valve core 15B the right side ( Annular sealing surface) (pressing) is crimped in the valve seat of the second main valve seat 14.

In addition, in this example, the substantial middle of access 16B is turned in the second U-shaped of the second sliding valve core 15B, before Rear direction is provided with the enhancing pin 15d (also reference Fig. 5 together) kept for shape.

In addition, in this example, (constituting the first sliding valve core 15A and the second slide-valve of main valve plug 15 in main valve plug 15 Core 15B) upper and lower surface formed concave face 15e, aftermentioned union body 25 (link plate 25A, 25B) supporting board 25c ( On left and right directions have it is small with gap) be embedded in concave face 15e.

As previously mentioned, first sliding valve core 15A and the second sliding valve core 15B are integrally formed simultaneously in the main valve plug 15 It is moved along axes O direction, can selectively obtain refrigeration position (upper end position) as shown in Figure 1 and heating as shown in Figure 2 Position (lower end position), the refrigeration position are to open port pF and make port pB and port pA via the first sliding valve core 15A First U-shaped turns to access 16A connection, and opens port pE and make port pC and port pD via the second sliding valve core 15B's Second U-shaped turns to the position of access 16B connection, which is to open port pB and make port pA and port pF via first The first U-shaped of sliding valve core 15A turns to access 16A connection, and opens port pC and make port pD and port pE via second The second U-shaped of sliding valve core 15B turns to the position of access 16B connection.

First sliding valve core 15A of main valve plug 15 when moving other than, two port (port pB in three ports With port pA or port pA and port pF) just on, the second sliding valve core 15B of main valve plug 15 when moving other than, be located at Two ports (port pC and port pD or port pD and port pE) in three ports just on, at this point, by carrying out self-conductance Enter into main valve plug 15 pressure of the high-pressure refrigerant of (the first U-shaped turns to access 16A), the first sliding valve core 15A and second Sliding valve core 15B is pressed to the left and right and is crimped on respectively the valve seat of the first main valve seat 13 and the second main valve seat 14.

First piston 21 and second piston 22 are connected to and can integrally be moved by union body 25, and the of the main valve plug 15 The mobile quilt of one sliding valve core 15A and the second sliding valve core 15B slightly to slide freely in the lateral direction and on front-rear direction The state being essentially prevented from is fitted into and is supported on the union body 25.

In this example, the union body 25 is by for example passing through the identical size and same shape produced such as stamping A pair of of plate constitute, each plate is (orthogonal with the valve seat of the first main valve seat 13 and the second main valve seat 14 in left-right direction Direction) (in other words, in a manner of being parallel to the plane orthogonal with valve seat) configuration, and this pair of of plate is in the longitudinal direction Relative configuration, is clamped with the main valve plug 15 (in the longitudinal direction) between the pair of plate.In addition, hereinafter, will configuration Plate in the front side of main valve plug 15 is known as link plate 25A, and the plate for being configured at the rear side of main valve plug 15 is known as link plate 25B。

More specifically, referring to Fig.1, Fig. 2 and Fig. 4, Fig. 5 it is found that each link plate 25A, 25B by relative to center line The plate of (line of symmetry) symmetrical lengthwise rectangular-shaped (here, spreading upper and lower overall length same widths) is constituted, and the center line is from each company The center of knot tying 25A, 25B extends along the longitudinal direction.Edge is formed in (up and down direction) substantial middle of each link plate 25A, 25B The shape of the periphery (front surface and upper and lower surface or rear surface and upper and lower surface) of the main valve plug 15 is (that is, section is big Cause concavity) supporting board 25c, by the main valve plug 15 (front part or rear section) engaging bearing in axes O It is integrally moved freely on direction.(left and right directions) width of supporting board 25c is than being set to the upper and lower of the spool 15 The width of depression in the surface face 15e is slightly smaller.

First piston 21 or the is extended up in being vertically connected with for supporting board 25c of each link plate 25A, 25B Web portion 25a until two pistons 22.Here, the web portion 25a is formed as ladder-like or crank by bending etc. Shape has shift plate portion 25aa and buttcover plate portion 25ab from the side supporting board 25c.The web portion of the link plate 25A of front side The shift plate portion 25aa of 25a is configured at the front side of axes O, avoids in front side in the first master when especially observing in the lateral direction The position of six port pA~pF of the valve seat of valve seat 13 and the second main valve seat 14 opening is (in other words, from six port pA The position that side deviates forward~pF), the shift plate portion 25aa of the web portion 25a of the link plate 25B of rear side is configured at axes O Rear side avoids the valve seat in the first main valve seat 13 and the second main valve seat 14 in rear side when especially observing in the lateral direction The position of six port pA~pF of opening (in other words, from the position that side deviates backward six port pA~pF).That is, in this example In, when observing in the lateral direction, the shift plate portion 25aa of the web portion 25a of a pair of of link plate 25A, 25B are each other and Bore (in the longitudinal direction) separation of each port pA~pF of the valve seat of one main valve seat 13 and the second main valve seat 14 opening Ground configuration, each port pA~pF (is more specifically, positioned at the end of downside on refrigeration position (upper end position) shown in Fig. 1 Mouthful pF and port pE is the port pB and port pC positioned at upside on heating position (lower end position) shown in Fig. 2) be located at should (referring particularly to Fig. 4) between the web portion 25a of a pair of of link plate 25A, 25B.

In addition, making the buttcover plate portion 25ab of the web portion 25a of link plate 25A, 25B (close to first piston 21 or the second The part of piston 22 and not Chong Die with each port pA~pF being open in the valve seat of the first main valve seat 13 and the second main valve seat 14 Part) docked with the buttcover plate portion 25ab of the web portion 25a of (relative configuration) link plate 25B, 25A of opposite side.Separately Outside, it is contemplated that assemblability etc. (is described in detail) later, concave-convex equal (aligned in position portion) can also be arranged in the buttcover plate portion 25ab, this is recessed It is convex for making link plate 25A, 25B aligned in position each other of relative configuration.

In addition, being equipped with installation foot 25b, the peace in the upper and lower end of each link plate 25A, 25B (web portion 25a) Foot 25b is filled towards side (the Formation cross-section substantially concave supporting board opposite with the side link plate 25B, 25A of relative configuration The direction of 25c) substantially 90-degree bent and formed, be equipped with threaded hole 29 in installation foot 25b perforation, the threaded hole 29 is for inserting The logical bolt 30 that the link plate 25A, 25B are linked to first piston 21 or second piston 22.

In addition, in this example, (the shift plate portion 25aa+ buttcover plate portion web portion 25a of described each link plate 25A, 25B Length of the length of up and down direction (axes O direction) 25ab) than first and second piston portion 11a, 11b of main valve shell 11 It is short.Upside connection lid 11d (outer peripheral portion of first piston portion 11a) of main valve shell 11 is set as and union body 25 as a result, The supporting board 25c (upper end side corner sections) of (each link plate 25A, 25B) is abutted and is prevented the union body 25 (that is, being embedded in The main valve plug 15 of union body 25) upward direction movement retainer, main valve shell 11 downside connection lid 11e (second The outer peripheral portion of piston portion 11b) it is set as supporting board 25c (lower end side with union body 25 (each link plate 25A, 25B) Corner) it abuts and prevents the stop of the movement in downward direction of the union body 25 (that is, the main valve plug 15 for being embedded in union body 25) Part.

In other words, in this example, it is equipped with and main valve in union body 25 (the supporting board 25c of each link plate 25A, 25B) The upside connection lid 11d or downside connection lid 11e of shell 11 abut and carry out the mobile limitation vertically of main valve plug 15 Retainer 25s.

As described above, the retainer 25s of mobile limitation for carrying out main valve plug 15 is set to union body 25, thus for example with it is upper The movement and prevention second of the simultaneous upward direction for prevention first piston 21 of end side cover 11A and lower end side cover 11B are living The structure of the retainer of the movement in downward direction of plug 22 is compared, and be can reduce and is applied to the negative of first and second piston 21,22 Lotus, and structure member and the upper end of first and second piston 21,22 limited for the position of main valve plug 15 can be mitigated The dimensional accuracy of side and lower end side cover 11A, 11B etc..In addition, as previously mentioned, upper end side cover 11A and lower end side cover Part 11B can certainly and for prevent first piston 21 upward direction movement and prevent second piston 22 in downward direction The retainer of mobile (that is, main valve plug 15 moves up and down).

In this example, as described above, each link plate 25A, 25B are made of the plate of identical size and same shape, because Two panels link plate 25A, 25B are oppositely disposed by this in the longitudinal direction, and make the web portion of link plate 25A, 25B of both sides The buttcover plate portion 25ab of 25a is against each other and oppositely (specifically, up and down on the contrary) combination configures, will be each via bolt 30 Installation foot 25b is fixed on the first piston 21 or second piston 22.Also, in the supporting board of each link plate 25A, 25B The first of (space of side observation substantially rectangular shape) described main valve plug 15 of (respectively from left and right directions) configuration is sliding between 25c Movable valve plug 15A and the second sliding valve core 15B, thus the first sliding valve core 15A of the main valve plug 15 and the second sliding valve core 15B in the lateral direction slightly slide freely and movement in the longitudinal direction be substantially prevented in the state of be embedded in this Union body 25 (referring particularly to Fig. 5).

It is fitted into and the main valve plug 15 for being supported on union body 25 (a pair of of link plate 25A, 25B) is living with first and second Plug 21,22 round-trip and by the upside of the concave supporting board 25c in the section of link plate 25A, 25B of the union body 25 Part or lower portion (the wide rectangular-shaped plane of width in the lateral direction) push (here, the first slide-valve of main valve plug 15 The upper and lower surface of core 15A and the second sliding valve core 15B are pressed), thus refrigeration position (upper end position) and heating position (under End position) between it is round-trip.

In addition, in this example, instantiating the union body 25 by a pair of of plate (link plate of identical size and same shape 25A, 25B) the case where constituting, but the union body 25 can certainly be for example made of a sheet material.

[movement of six-way valve main body 10]

Then, the movement of six-way valve main body 10 with structure as described above is illustrated.

Heating position (lower end position) (as shown in Figure 2 second is in the main valve plug 15 being configured in main valve shell 11 Connected state) when, via aftermentioned four-way pilot valve 90, make the second operating chamber 32 and the port pA as discharge side high pressure port Connection, and be connected to the first operating chamber 31 with the port pD as suction side low-pressure port, then it is imported to the second operating chamber 32 The refrigerant of high temperature and pressure, and from the first operating chamber 31 discharge high temperature and pressure refrigerant.Therefore, the other end of main valve chamber 12 The pressure of second operating chamber 32 of side (lower end side) is higher than the pressure of the first operating chamber 31 of the one end (upper end side) of main valve chamber 12 Power, as shown in Figure 1, the first, second piston 21,22 and main valve plug 15 are moved upward, union body 25 (each link plate 25A, The supporting board 25c of 25B) retainer 25 and upside link lid 11d and abut locking, main valve plug 15 is in position (upper end of freezing Position) (the first connected state as shown in Figure 1).

It is connected to port pA with port pB (turning to access 16A via the first U-shaped), makes port pC and port pD (warp Access 16B is turned to by the second U-shaped) connection, it is connected to port pE with port pF (via main valve chamber 12), therefore in heat pump type refrigerating In heating system, refrigeration operation is carried out.

When main valve plug 15 is in refrigeration position (upper end position) (the first connected state as shown in Figure 1), via aftermentioned Four-way pilot valve 90, be connected to the first operating chamber 31 with the port pA as discharge side high pressure port, and make the second movement Room 32 is connected to the port pD as suction side low-pressure port, then the refrigerant of high temperature and pressure is imported to the first operating chamber 31, and And the refrigerant of high temperature and pressure is discharged from the second operating chamber 32.Therefore, the first movement of the one end (upper end side) of main valve chamber 12 The pressure of room 31 is higher than the pressure of the second operating chamber 32 of the another side (lower end side) of main valve chamber 12, as shown in Fig. 2, first, Second piston 21,22 and main valve plug 15 move downwards, union body 25 (each link plate 25A, 25B supporting board 25c) Retainer 25s and downside link lid 11e and abut locking, and main valve plug 15, which is in, heats position (lower end position) (as shown in Figure 2 the Two connected states).

It is connected to port pA with port pF (turning to access 16A via the first U-shaped), makes port pE and port pD (warp Access 16B is turned to by the second U-shaped) connection, it is connected to port pC with port pB (via main valve chamber 12), therefore in heat pump type refrigerating In heating system, heating operation is carried out.

[structure of four-way pilot valve 90]

As the four-way pilot valve 90 of pilot valve, its structure itself is well known structure, such as enlarged drawing institute in Fig. 6 (A), (B) Show, base end side (left end side) periphery have be externally embedded to be fixed with electromagnetic coil 91 valve chest 92 is constituted by cylindric straight tube, In the valve chest 92, configuration magnetic-attraction element 95, compression helical spring 96, plunger 97 are sequentially connected in series from base end side.

The left part of valve chest 92 is sealingly engaged in the flange (periphery stage portion) of magnetic-attraction element 95 by welding etc., Magnetic-attraction element 95 is fastened and fixed to the cover 91A of the periphery of the exciting electromagnetic coil 91 of covering energization by bolt 92B.

On the other hand, there is the tubule for importing high-pressure refrigerant to insert mouth, and (high pressure imports the band filter of port a) Cover 98 the right-end openings portion of valve chest 92 is airtightly installed on by welding, soldering, riveting etc., by cover 98, column The region that plug 97 and valve chest 92 surround is valve chamber 99.Inserting mouth via the tubule for being airtightly plugged in cover 98, (high pressure is led The high pressure tubule #a with flexibility of inbound port a) imports high temperature from the port (discharge side high pressure port) pA to valve chamber 99 The refrigerant of high pressure.

In addition, inner face is that the valve seat 93 of flat valve seat is airtightly engaged in the column in valve chest 92 by soldering etc. Between plug 97 and cover 98, in the valve seat (inner face) of the valve seat 93, via tubule #b and the six-way valve main body 10 The connection of the first operating chamber 31 port b, connect with port (suction side low-pressure port) pD via tubule #c port c, via The port d that tubule #d is connect with the second operating chamber 32 is from tip side (right end side) successively along the length direction of valve chest 92 (left and right Direction) separate specified interval laterally opening arranged side by side.

The plunger 97 being oppositely disposed with magnetic-attraction element 95 is substantially cylindric, along axial (along valve casing in valve chest 92 The direction of the center line L of body 92) sliding freely configure.Spool holder 94A is pressed together with installation part 94B by its base end part Enter, rivet etc. to be mounted on the end of the side opposite with 95 side of magnetic-attraction element of the plunger 97, which will Spool 94 is remained in its free end side and can be slided in a thickness direction.Flat spring is installed in spool holder 94A 94C, flat spring 94C exert a force to the direction (thickness direction) that spool 94 is pressed on to valve seat 93.Spool 94 is in order to in valve seat Connected state between port b, c, d of 93 valve seat opening switches over, in the state docked with the valve seat of the valve seat 93 Under, it is slided with the movement of the left and right directions of plunger 97 in the valve seat of valve seat 93.

In addition, being equipped with recess portion 94a in spool 94, the size of recess portion 94a is the valve that can selectively make in valve seat 93 Between adjacent port b-c in three port b~d of seat surface opening, the size that is connected between c-d.

In addition, compression helical spring 96 compression be installed between magnetic-attraction element 95 and plunger 97 and to make plunger 97 from attraction The isolated direction of element 95 (right in the figure) force, in this example, valve seat 93 (left part) are to prevent plunger 97 to the right The retainer of the movement of side.In addition, the structure as the retainer, it needless to say can be using other structures.

In addition, to be installed on back side of six-way valve main body 10 etc. via installation part 92A appropriate for above-mentioned four-way pilot valve 90 Position.In addition, the port pD as suction side low-pressure port is connect with tubule #c, but can also in above-mentioned four-way pilot valve 90 It is connect with the port pC for flowing middle compression refrigerant with tubule #c.

[movement of four-way pilot valve 90]

In the four-way pilot valve 90 constituted as described above, when being disconnected to the energization of electromagnetic coil 91, such as Fig. 1 and Shown in Fig. 6 (A), plunger 97 passes through the active force of compression helical spring 96, is pushed position until its right end is abutted with valve seat 93 It is set to only.In this state, spool 94 is located on port b and port c, is connected to by recess portion 94a port b with port c, and And port d is connected to valve chamber 99, therefore flow into port (discharge side high pressure port) pA high-pressure fluid via high pressure tubule #a → 99 → port of valve chamber d → tubule #d → port p12 imports the second operating chamber 32, and the high-pressure fluid of the first operating chamber 31 is to end Mouth p11 → tubule #b → port b → recess portion 94a → port c → tubule #c → port (suction side low-pressure port) pD flowing is side by side Out.

In contrast, when by being set as connecting to the energization of electromagnetic coil 91, as shown in Fig. 2 and Fig. 6 (B), plunger 97 By the attraction of magnetic-attraction element 95, (compression spiral shell is overcome until being attracted the position abutted until its left end with magnetic-attraction element 95 Revolve the active force of spring 96).At this point, spool 94 is located on port c and port d, connected by recess portion 94a port c and port d It is logical, and port b is connected to valve chamber 99, therefore flows into the high-pressure fluid of port (discharge side high pressure port) pA via high pressure fine Pipe #a → 99 → port of valve chamber b → tubule #b → port p11 imports the first operating chamber 31, and the high-pressure spray of the second operating chamber 32 Body is flowed to port p12 → tubule #d → port d → recess portion 94a → port c → tubule #c → port (suction side low-pressure port) pD It moves and is discharged.

Therefore, when by disconnecting to the energization of electromagnetic coil 91, the main valve plug 15 of six-way valve main body 10 is from heating position (the Two connected states) to refrigeration position (the first connected state) transfer, flow path switching as described above is carried out, on the other hand, is being incited somebody to action When being set as connecting to the energization of electromagnetic coil 91, the main valve plug 15 of six-way valve main body 10 from refrigeration position (the first connected state) to Position (the second connected state) transfer is heated, flow path switching as described above is carried out.

In this way, in six direction changeover valves 1 of present embodiment, by first to electromagnetic type four-way to switch to turn on/off The energization of pilot valve 90, thus using the high-pressure fluid to circulate in six direction changeover valves 1 (as the port pA of high-pressure section flowing Fluid) with low-pressure fluid (as low-pressure section port pD flowing fluid) differential pressure, make constitute six-way valve main body 10 Main valve plug 15 moved in main valve chamber 12, so as to switch the company being set between total six ports of main valve shell 11 Logical state, in heat pump type refrigerating heating system, carry out switching from from heating operation to refrigeration operation and from refrigeration operation to The switching of heating operation.

[function and effect of six direction changeover valves 1]

From above explanation it is appreciated that in six direction changeover valves 1 of present embodiment, in main valve chamber 12, make port PB, port pA and port pF are on axes O direction and row of openings, and in port pB, port pA and port pF relative to axis Line O opposite side makes port pC, port pD and port pE on axes O direction and row of openings, and the is equipped in main valve plug 15 One U-shaped turns to access 16A and the second U-shaped turns to access 16B, makes main valve plug 15 mobile, in main valve chamber 12 so as to select Property obtain the first connected state and the second connected state, which is to make port pA and port pB via the first U Shape turns to access 16A connection, so that port pC is turned to access 16B via the second U-shaped with port pD and is connected to, makes port pE and port pF Via the state that main valve chamber 12 is connected to, which is that port pA and port pF is made to turn to access 16A via the first U-shaped Connection makes port pE turn to access 16B via the second U-shaped with port pD and is connected to, makes port pC and port pB via main valve chamber 12 The state of connection.Therefore, compared with six direction changeover valves for having used previous slidingtype main valve plug, the master equipped with port can be made Valve seat (the first main valve seat 13 and the 2nd main valve seat 14), main valve plug 15 (on axes O direction) shorten, therefore it is easy to ensure that main valve seat The face precision (flatness) of the valve seat of (the first main valve seat 13 and the second main valve seat 14), the sealing surface of main valve plug 15, check valve Leakage, and fluid (such as high-pressure fluid (refrigerant)) turns to access 16A via the first U-shaped and flows, therefore can also lower The pressure loss.

In addition, in the present embodiment, the fluid (such as low pressure refrigerant) flowed in six-way valve main body 10 is via Two U-shapeds turn to access 16B flowing, and fluid (such as in compression refrigerant) in main valve chamber 12 in left-right direction (linearly) Flowing, therefore, thus also can reduce the pressure loss.

On the basis of above-mentioned, six direction changeover valves 1 of present embodiment are being used for heat pump type refrigerating heating system etc. In the case where the environment of the refrigerant of the refrigerant of high temperature and pressure and low-temp low-pressure flowing, the of the refrigerant flowing of high temperature and pressure It is (low that the second U-shaped that one U-shaped turns to the refrigerant flowing of access (high-pressure side U-shaped turns to access) 16A and low-temp low-pressure turns to access Pressure side U-shaped turns to access) 16B is not set as separation farther out via for example metal main valve seat, therefore compared to high temperature height The previous structure of the refrigerant of pressure and the refrigerant of low-temp low-pressure via metal main valve seat and with close state flowing, The heat exchange amount (that is, heat loss) between them can be greatly reduced, it is thus possible to access this effect of the efficiency of raising system Fruit.

In addition, main valve plug 15 has the first sliding valve core (high pressure sideslip of tubular in six direction changeover valves 1 of the invention Movable valve plug) (first is sliding in left side by 15A and the second sliding valve core (low-pressure side sliding valve core) 15B, the second sliding valve core 15B The side of the side movable valve plug 15A) there is the fitting projection 15b for being sliding freely embedded in first sliding valve core 15A, it is sliding first Movable valve plug 15A embeds fitting projection 15b, to pass through the inner peripheral surface of the first sliding valve core 15A and the left end of fitting projection 15b Face, zoning forms first U-shaped and turns to access (high-pressure side U-shaped turns to access) 16A, therefore is turned by importing first U-shaped The second sliding valve core 15B is pressed into (crimping) in the second main valve for being equipped with port to the high-pressure fluid (fluid pressure) of access 16A Seat 14.Therefore, it is able to suppress the figure (in particular, the size in the direction orthogonal with axes O) of main valve plug 15, while more effectively Check valve leakage.

In addition, setting the first slide-valve of 13 side of the first main valve seat there are three port (port pB, port pA and port pF) The shape of the annular sealing surface of core 15A is less than the fitting projection for being configured at the first sliding valve core 15A and the second sliding valve core 15B The shape of O-ring 18 between 15b, therefore, acted on caused by the difference using the compression area of the first sliding valve core 15A this The differential pressure of one sliding valve core 15A, by the first sliding valve core 15A pressing (crimping) in the first main valve seat 13 for being equipped with port, therefore, Thus it also can more effectively check valve leak.

[other examples of six direction changeover valves 1]

In addition, in the above-described embodiment, the second U-shaped of the second side sliding valve core 15B is made to turn to access (low-pressure side U-shaped Turn to access) 16B the area of passage (sectional area substantially vertical with flowing to) and the first side sliding valve core 15A the first U-shaped turn It is roughly the same to access (high-pressure side U-shaped turns to access) area of passage (with substantially vertical sectional area is flowed to) of 16A, but second The first U-shaped of flow-rate ratio that U-shaped turns to access (low-pressure side U-shaped turns to access) 16B turns to access (high-pressure side U-shaped turns to access) The flow of 16A is more (in other words, being compressed in the high-pressure refrigerant that the first U-shaped turns to access 16A flowing), can also be in contrast It answers, as shown in fig. 7, the second sliding valve core 15B (in illustrated example, fitting projection 15b) is made to become larger, the second U-shaped is made to turn to access The area of passage of 16B is greater than the area of passage that the first U-shaped turns to access 16A, and high-low pressure flow path ratio also changes.According to this structure, The high-low pressure flow path ratio that low-pressure side U-shaped can be turned to access and high-pressure side U-shaped steering access is set as most appropriate.Therefore, make To be greater than stream used in refrigerating and heating systems of flow path area etc. of high-pressure side flow path in the flow path area for making low-pressure side flow path Road switching valve is especially suitable.

In addition, in the above-described embodiment, the first U-shaped of the first side sliding valve core 15A turns to access, and (high-pressure side U-shaped turns To access) 16A is in substantially concavity, but in order to which the high-pressure refrigerant stream for making the first U-shaped turn to access 16A is smooth and reduces noise, As shown in figure 8, corner can also be formed with circular arc by bowl-shape in the left side of the fitting projection 15b of the second sliding valve core 15B Be recessed the guide surface 15c constituted.In this case, as shown, by the left end of the fitting projection 15b of the second sliding valve core 15B Face is configured close to the inward flange shape portion 15a of the first sliding valve core 15A.

In addition, in six direction changeover valves 1 of above embodiment, to using four-way pilot valve 90 to drive in main valve chamber 12 The structure of main valve plug 15 is illustrated, but can also for example replace four-way pilot valve 90, be using motor in main valve chamber 12 Drive the structure of main valve plug 15.

In addition, in six direction changeover valves 1 of above embodiment, can not only group enter heat pump type refrigerating heating system, when So can also group enter other systems, device, equipment class.

Claims

1. a kind of six direction changeover valves, have: the main valve shell of tubular, the main valve shell zoning form main valve chamber；Port, in the master Valve chest is total to set that there are six the ports；And the main valve plug of slidingtype, the main valve plug are configured in the main valve chamber It moves in the axial direction,

Multiple access for will selectively be connected between the port are being equipped in the main valve plug, it can be by making It states main valve plug movement and makes to be switched between the port being connected to, which is characterized in that,

Three ports are abreast open to the main valve chamber in the axial direction, and in three ports relative to axis Opposite side, other three ports are abreast open to the main valve chamber in the axial direction,

The main valve plug has the high-pressure side sliding valve core of low-pressure side sliding valve core and tubular, and the low-pressure side sliding valve core is in side Face has the fitting projection for being sliding freely embedded in the high-pressure side sliding valve core, embeds institute in the high-pressure side sliding valve core Fitting projection is stated, so that by the inner peripheral surface of the high-pressure side sliding valve core and the end face of the fitting projection, zoning forms height Side U-shaped is pressed to turn to access, which, which turns to access, is selectively connected to two ports in three ports, and And the high-pressure side U-shaped turns to the fluid that access is imported into relatively high pressure, the high-pressure side sliding valve core and the low pressure Slideslip Spool is integrally moved freely in the axial direction and is slided over each other freely on direction perpendicular to the axis, and the low pressure The another side of sideslip movable valve plug offers low-pressure side U-shaped and turns to access, and low-pressure side U-shaped steering access selectively makes described Two ports connection in other three ports, and the low-pressure side U-shaped turns to the fluid that access is imported into relatively low pressure,

Make the main valve plug mobile in the main valve chamber,

So as to selectively obtain following multiple connected states: making two ports in three ports via the height It presses side U-shaped to turn to access connection, so that two ports in other described three ports is turned to access via the low-pressure side U-shaped and connect It is logical, so that other a ports in other a ports and other described three ports in three ports is passed through institute It states in main valve shell and is connected to.

2. six direction changeover valve according to claim 1, which is characterized in that

Configured with cricoid close between the high-pressure side sliding valve core and the fitting projection of the low-pressure side sliding valve core Seal component.

3. six direction changeover valve according to claim 2, which is characterized in that

The shape of the annular sealing surface of the high-pressure side sliding valve core of main valve seat side equipped with three ports is less than described The shape of seal member.

4. six direction changeover valve according to claim 3, which is characterized in that

The end inner circumferential of the main valve seat side equipped with three ports in the high-pressure side sliding valve core is equipped with inward flange shape Portion is formed with the annular sealing surface in the end face of the main valve seat side in the inward flange shape portion.

5. six direction changeover valves according to any one of claim 2-4, which is characterized in that

Force application part is configured between the high-pressure side sliding valve core and the low-pressure side sliding valve core, the force application part is to institute High-pressure side sliding valve core is stated to exert a force in the opposite directions to each other with the low-pressure side sliding valve core.

6. six direction changeover valve according to claim 5, which is characterized in that

The force application part is configured in the outside of the seal member.

7. six direction changeover valve according to claim 1 to 6, which is characterized in that

The area of passage that the low-pressure side U-shaped turns to access is greater than the area of passage that the high-pressure side U-shaped turns to access.

8. six direction changeover valves described in any one of -7 according to claim 1, which is characterized in that

The guide surface being made of bowl-like depression is formed in the end face of the fitting projection, which makes the high-pressure side U-shaped The flowing for turning to the fluid of the high pressure in access is smooth.

9. six direction changeover valve according to claim 1 to 8, which is characterized in that

The one end and another side of the main valve chamber in the main valve shell be equipped with volume-variable the first operating chamber and Second operating chamber, first operating chamber and the second operating chamber are formed by a pair of of first piston and second piston zoning, and are chosen It imports to selecting property, high-pressure fluid is discharged, the main valve plug is configured to the first piston and second piston gearing and in axis Freely, controlling high-pressure fluid relative to importing, the discharge of first operating chamber and the second operating chamber makes institute for movement on direction It states first piston and second piston is mobile, to make the main valve plug in the main valve indoor moving.

10. six direction changeover valve according to claim 9, which is characterized in that

The first piston and the second piston are connected to by union body and can integrally be moved, the union body by be configured at One or more pieces plates in the orthogonal direction of the valve seat of the main valve seat equipped with the port are constituted, the main valve plug with it is described Sliding freely it is supported on the union body on the orthogonal direction of the valve seat of main valve seat, and with the first piston and the The round-trip of two pistons and move.

11. six direction changeover valve according to claim 10, which is characterized in that

It is equipped with retainer in the union body, which limits the movement to axis direction of the main valve plug.

12. six direction changeover valve according to claim 11, which is characterized in that

The retainer is abutted with the main valve shell.