Reversing valve

Abstract

The utility model discloses a reversing valve, which is characterized by comprising a valve body, a transition conversion seat, a valve core, a left end cover, a right end cover and a valve core driving mechanism, four connecting pipes are arranged on the outer wall of the valve body in the same radial direction, a transition conversion base is arranged in an inner cavity of the valve body, and a valve element is arranged in a U-shaped space formed by the inner side face 212 of the transition conversion base. The four connecting pipes on the valve body are communicated with the channel in the valve core through the transition conversion seat, so that the connecting pipes are communicated pairwise; a left end cover and a right end cover are arranged at the two ends of the valve body respectively, and a closed space is formed by the left end cover, the right end cover and the valve body. And the driving mechanism is arranged in the valve body in a shielding manner. The transition conversion seat is additionally arranged between the valve element and the valve body inner wall connecting pipe, the irregular valve body inner wall face is converted into a plane, the plane is perfectly matched with the valve element, and the sealing performance of the reversing valve is greatly improved. In addition, the number of the transition conversion bases is three, one face is reduced compared with a conventional square reversing valve, production and machining are easier, and cost is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioner reversing valve technical field, concretely is a kind of reversing valve, namely a low leakage low flow resistance can be automatically compensated four-way reversing valve, for air conditioning refrigeration heating switching. BACKGROUND

[0002] The existing reversing valve is generally of circular cross section, cylindrical surface or curved surface sealing, and it is difficult to achieve consistency due to the cooperation of two complete curved surfaces, and leakage is inevitable due to the necessary gap required for movement between the valve core and the valve body, and the leakage amount is large, and since the valve core assembly can rotate, an anti-rotation component needs to be added, thereby further increasing the leakage.

[0003] The Chinese patent with publication number CN109114281A discloses a square reversing valve, which includes a valve body, a left end cover, a right end cover and a valve core assembly; the valve body is square; the valve core assembly includes a left piston, a right piston, a middle partition plate, a left valve plate and a right valve plate; the valve body surface is provided with four channels; the left end cover, the right end cover and the valve body form a square space for accommodating the valve core assembly; the left valve plate is connected between the left piston and the middle partition plate, the right valve plate is connected between the right piston and the middle partition plate, the middle partition plate is connected between the left valve plate and the right valve plate, and the left valve plate and the right valve plate are cross-distributed; the left piston, the right piston and the middle partition plate of the valve core assembly are square, the valve core assembly is limited in the interior of the valve body, and the valve core assembly moves left and right in the interior of the valve body; the square reversing valve disclosed in the patent has a fixed square inner wall of the valve body, and the inner plane of the square hole is difficult to process, and it is difficult to ensure the precision processing of the perpendicularity of the four faces, so that it is difficult for the two adjacent planes of the valve body to perfectly cooperate with the two faces of the square valve core, and the sealing effect is poor, thus existing problems such as great processing difficulty and easy leakage are difficult to solve. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the deficiencies of the prior art and providing a reversing valve.

[0005] The technical scheme provided by the utility model is as follows: a reversing valve, which is characterized in that the reversing valve comprises a valve body, a transition conversion seat, a valve core, a left end cover, a right end cover, a valve core driving mechanism and a connecting piece.

[0006] The valve body is cylindrical, four channel openings are evenly arranged at the same radial position on the valve body wall, the channel openings lead to the inner cavity of the valve body, four pipes are arranged at the channel opening position on the valve body wall, which are respectively a first pipe, a second pipe, a third pipe and a fourth pipe; the four pipes are sealingly installed on the valve body wall and communicate with the inner cavity of the valve body; a transition seat is arranged at the pipe position of the inner cavity of the valve body, the number of the transition seat is three, and the transition seat is installed corresponding to the second pipe, the third pipe and the fourth pipe; a transition seat hole is arranged in the middle of the transition seat, the transition seat hole communicates with the pipe on the valve body; the transition seat does not exceed the center of the valve body cylinder, the inner side of the transition seat faces the center of the valve body cylinder, and the outer side of the transition seat faces the inner wall of the valve body; the inner side is a plane, and the outer side is an arbitrary shape; the outer side is sealingly connected with the pipe inserted into the valve body or the inner wall of the valve body around the channel opening; the transition seat can float;

[0007] The inner side of the three transition seats forms a "U" shaped cross section;

[0008] A valve core is arranged in the "U" shaped space formed by the inner side of the transition seat, the valve core has four sides, three sides of the valve core are straight, and the other side is a straight side or an arbitrary curved side, and the three straight sides are matched with the planes of the inner sides of the three transition seats; the valve core axially slides in the valve body;

[0009] Two channel openings are arranged on each side of the valve core and axially distributed, and eight channel openings are arranged on the four sides of the valve core, which are respectively a first channel opening, a second channel opening, a third channel opening, a fourth channel opening, a fifth channel opening, a sixth channel opening, a seventh channel opening and an eighth channel opening;

[0010] The valve core has two radial positions in axial sliding, which are a left radial position of the valve core and a right radial position of the valve core;

[0011] The first channel opening, the second channel opening, the third channel opening and the fourth channel opening are arranged on the four sides of the valve core at the left radial position of the valve core, and the on-off relationship of the four channel openings is that the first channel opening communicates with the second channel opening to form a DE channel, and the third channel opening communicates with the fourth channel opening to form an SC channel; the DE channel and the SC channel are not communicated;

[0012] The fifth channel opening, the sixth channel opening, the seventh channel opening and the eighth channel opening are arranged on the four sides of the valve core at the right radial position of the valve core, and the on-off relationship of the four channel openings is that the fifth channel opening communicates with the eighth channel opening to form a DC channel, and the sixth channel opening communicates with the seventh channel opening to form an ES channel; the DC channel and the ES channel are not communicated;

[0013] The SC channel, the ES channel, the DE channel, and the DC channel are connected or not connected at the corner of the channel;

[0014] The first channel port or the fifth channel port of the valve core is in communication with the first connector on the valve body, and the remaining channel ports are in communication with the holes of the three transition conversion seats, respectively. The four connectors on the valve body are in communication with each other through the channels in the valve core.

[0015] At least one end of the left and right ends of the valve core is provided with a valve core driving mechanism, and the valve core driving mechanism is shielded in the valve body.

[0016] The left end cover and the right end cover are respectively arranged at the two ends of the valve body, and form a closed space with the valve body.

[0017] The left end cover, the right end cover, or at least one of the two ends of the valve body is provided with a connecting piece.

[0018] Further, the valve core driving mechanism in the valve body is pneumatic, and the valve core driving mechanism includes a left piston assembly and a right piston assembly. The left piston assembly and the right piston assembly are respectively arranged at the two ends of the valve core, and the valve core has a radial gap relative to the left piston assembly and the right piston assembly. The left piston assembly and the right piston assembly are matched with the inner wall of the piston cavity at the two ends of the valve body. The valve core slides in the axial direction under the pushing action of the left and right piston assemblies. The connecting piece is a joint or a pipeline for gas-liquid power transmission.

[0019] Further, the valve core driving mechanism in the valve body is electric, and the valve core driving mechanism is a screw rod driving mechanism. The screw rod driving mechanism includes a screw rod, a rotating mechanism, and a nut. The valve core hole is arranged at the axial center of the valve core. The nut is arranged in the valve core hole. The nut cannot rotate in the valve core hole. The nut can move radially relative to the valve core, and the nut is axially constrained in the valve core hole.

[0020] One end of the screw rod of the rotating screw rod driving mechanism is connected with the rotating mechanism, and the other end is matched with the nut. The rotating mechanism rotates to drive the screw rod to rotate. The screw rod drives the nut to move in the axial direction, and the nut drives the valve core to move in the axial direction.

[0021] The rotating screw rod driving mechanism is arranged in the interior of one end of the valve body and is shielded from the outside.

[0022] The rotating mechanism of the screw rod driving mechanism is composed of a motor or a motor with a speed reducer. The rotating mechanism is provided with a control circuit.

[0023] The connecting piece is a terminal plate for power transmission and control.

[0024] Further, a valve core radial limiting piece for limiting the movement of the valve core is arranged at the position of the first connector in the valve body.

[0025] Furthermore, a transition seat is provided at the first connecting pipe position in the valve body; a self-driving pipeline is provided at the inner core of the valve body or the end cover or at the outside of the valve body;

[0026] The two connecting pipes at 180° relative to the valve body are respectively connected to one end of the two self-driving pipelines, and the other ends of the two self-driving pipelines are respectively connected to the two ends of the two piston cavities, forming a reversing valve that can automatically switch.

[0027] Furthermore, the connecting pipe is inserted into the inner cavity of the valve body, and its end exceeds the inner wall of the valve body; the outer side surface of the transition conversion seat is directly installed on the end of the connecting pipe extending into the valve body, and the installation method is one or more combined sealing installations including outer sleeve installation, inner insertion installation, and connecting pipe end face plane sealing installation.

[0028] Furthermore, an elastic sealing member is provided at the cooperation position between the transition conversion seat and the connecting pipe.

[0029] Furthermore, the three transition seats are connected together, and the outer side surfaces of the transition seats are installed on the inner wall of the valve body.

[0030] Furthermore, a sealing valve seat is respectively provided in the second channel port and the eighth channel port of the valve core, or a sealing valve seat is respectively provided in the fourth channel port and the sixth channel port of the valve core, and there is a hole in the middle of the sealing valve seat; one side of the sealing valve seat is sealed with the corresponding channel port on the valve core, and the other side is pressed and sealed with the inner side surface of the transition conversion seat.

[0031] Furthermore, a sealing valve seat is respectively provided in the third channel opening and the seventh channel opening of the valve core, and there is a hole in the middle of the sealing valve seat. One side of the sealing valve seat is sealed with the corresponding channel opening on the valve core, and the other side is sealed with the inner side surface of the transition conversion seat; the two sealing valve seats can form an integrated structure.

[0032] Furthermore, a partition is provided between the two channels at the left and right radial positions of the valve core, and the length of the partition is greater than or equal to the major diameter of the corresponding connecting channel.

[0033] Furthermore, a blocking and correcting mechanism is provided in the valve body, and the blocking and correcting mechanism is a blocking member, a correcting member, a groove, a rib or a stop;

[0034] A blocking member is provided around the transition conversion seat to prevent the transition conversion seat from moving axially;

[0035] The diameter of the transition seat installed in the valve body is large, and the diameter of the piston cavity at both ends of the valve body is small, forming a stop at the connection between the large diameter and the small diameter to prevent the axial movement of the transition seat;

[0036] The valve body mounting pipe position and the piston cavity transition position at both ends of the valve body adopt annular grooves or convex ribs to correct the piston cavity of the valve body to be circular, or a correction member is arranged to correct the piston cavity position at both ends of the valve body to be circular.

[0037] Further, the left end cover and the right end cover are respectively provided with impact-resistant damping pits, springs, magnets, passage holes or control small valve mechanisms.

[0038] The small valve mechanism is communicated with the connecting piece to reduce the impact and internal leakage when the valve core moves to the left and right end positions; sensors or sight glasses are arranged on the left end cover, the right end cover or both ends of the valve body.

[0039] Further, the pipe connection on the valve body cylinder wall comprises a first pipe connection and any two of a second pipe connection, a third pipe connection and a fourth pipe connection, forming a three-way valve.

[0040] The utility model discloses the beneficial effects that: 1, between the valve core and the valve body inner wall pipe connection, increase transition conversion seat, convert the irregular valve body inner wall surface into plane, and the plane of separate processing transition conversion seat is very easy; 2, every transition conversion seat can be slightly floating, can be with the perfect cooperation of two adjacent planes of valve core, thereby the sealing property of the reversing valve is greatly improved; 3, the number of transition conversion seat is three, reduces a plane compared with square reversing valve, and processing is more easy, simultaneously reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is the valve core in right end position pipe connection position section schematic view of the utility model

[0042] Figure 2 It is the valve core in left end position pipe connection position section schematic view of the utility model;

[0043] Figure 3 It is the valve core structure schematic view of the utility model;

[0044] Figure 4 It is the working principle diagram of piston pneumatic drive of the utility model

[0045] Figure 5 It is the working principle diagram of electric drive of the utility model;

[0046] Figure 6 It is the structure schematic view of the valve core radial positioning member of the utility model;

[0047] Figure 7 It is the automatic reversing valve structure schematic view of the utility model;

[0048] Figure 8 It is the schematic view of the utility model that the middle separation is greater than or equal to the passage diameter, and the valve core is in the middle position.

[0049] Figure 9 is a structure schematic diagram of the limiting correction member of the utility model;

[0050] Figure 10 is a structure schematic diagram of the utility model with leakage passage and small valve;

[0051] Figure 11 is a structure schematic diagram of the circular valve body of the utility model;

[0052] Figure 12 is a structure schematic diagram of the utility model with outer circle and inner square valve body;

[0053] Figure 13 is a structure schematic diagram of the transition conversion seat of the utility model;

[0054] Figure 14 is a structure schematic diagram of the utility model with connecting pipe inserted into the valve body;

[0055] Figure 15 is a structure schematic diagram of the transition conversion seat of the utility model with other connection mode;

[0056] Figure 16 is a structure schematic diagram of the transition conversion seat of the utility model with welding;

[0057] Figure 17 is a structure schematic diagram of another transition conversion seat of the utility model.

[0058] In the figure: 1, valve body, 2, transition conversion seat, 211, conversion seat hole, 212, inner side, 213, outer side 213, 3, valve core, 301D1, first passage port, 302E1, second passage port, 303S1, third passage port, 304C1, fourth passage port, 305D2, fifth passage port, 306E2, sixth passage port, 307S2, seventh passage port, 308C2, eighth passage port, 309, DE channel, 310, SC channel, 311, DC channel, 312, ES channel, 313, middle partition, 4, left end cover, 5, right end cover, 6, left piston assembly, 7, right piston assembly, 8, valve core boss, 9, adapter, 10, valve core driving mechanism, 100, rotary screw driving mechanism, 101, screw, 102, rotating mechanism, 103, nut, 11 terminal plate, 11D, first connector, 12E, second connector, 13S, third connector, 14C, fourth connector, 15, piston cavity, 16, blocking piece, 17, valve core radial position limiting piece, 18, annular groove, 19, self-driving pipeline, 20, correction piece, 21, control circuit, 22, anti-impact shock absorbing pit, 23, elastic sealing piece, 24, pit, 25, bowl-shaped sealing piece, 26, small valve mechanism, 27, sensor, 28, sight glass, 29, conversion seat boss, 30, leakage channel, 31, valve core hole, 33, leakage channel control small valve, 34, valve core left radial position, 35, valve core right radial position, 36, sealing valve seat, 41, axial, 42, radial. DETAILED DESCRIPTION

[0059] In order to better understand and implement, the utility model is described in detail below with reference to the drawings.

[0060] As Figure 1 , 2 , 3, a reversing valve, comprising a valve body 1, a transition conversion seat 2, a valve core 3, a left end cover 4, a right end cover 5, a valve core driving mechanism 10, an adapter 9;

[0061] The valve body 1 is a circular cylindrical structure, and four channel openings are arranged at the same radial position of the valve body 1. The channel openings lead to the inner cavity of the valve body 1. Four pipes are arranged at the channel opening position of the valve body 1, which are respectively a first pipe 11D, a second pipe 12E, a third pipe 13S and a fourth pipe 14C. The four pipes are sealingly installed on the wall of the valve body 1 and communicate with the inner cavity of the valve body 1. The inner cavity of the valve body 1 is provided with a transition seat 2 at the pipe position. The number of the transition seat 2 is three, which is correspondingly installed with the second pipe 12E, the third pipe 13S and the fourth pipe 14C. The transition seat 2 is provided with a transition seat hole 211 in the middle. The transition seat hole 211 is correspondingly communicated with the pipe on the valve body 1. The position of the transition seat 2 does not exceed the center of the valve body. The face of the transition seat 2 towards the center of the valve body 1 is an inner side face 212. The face away from the center of the valve body 1 and towards the inner wall of the valve body 1 is an outer side face 213. The inner side face 212 is a plane, and the outer side face 213 is an arbitrary shape. The outer side face 213 is sealingly connected with the pipe inserted into the valve body 1 or the inner wall of the valve body 1 around the channel opening.

[0062] Each pipe is sealingly assembled with the corresponding channel on the valve body 1. The preferred installation method is welding. Among them, the second pipe 12E, the third pipe 13S and the fourth pipe 14C are inserted into the valve body and sealingly welded, and extend into the valve body. The first pipe 11D does not extend into the inner cavity of the valve body and is sealingly assembled on the wall of the valve body 1. The end of the three pipes inserted into the inner cavity 12E, 13S and 14C of the valve body 1 is processed into a sealing plane, and the transition seat 2 is installed. The number of the transition seat 2 is three. The transition seat 2 can be made of metal, non-metal or any other wear-resistant sealing material, or a double-material combination with a wear-resistant sealing material on the mating surface. The outer shape of the transition seat 2 is an arbitrary shape, preferably a round square or a square. The transition seat 2 has a transition seat hole 211 in the middle. The transition seat hole 211 corresponds to the pipe on the valve body 1. The inner side face 212 of the transition seat 2 is a plane with a chamfered edge. The outer side face 213 is an arbitrary shape. The outer side face 213 has a ring-shaped end groove. The outer side face 213 of the transition seat is sealingly connected with the end plane of the pipe passing through the inner wall of the valve body or is sealingly installed with the pipe through an elastic sealing element 23, or is sealingly connected with the inner wall around the channel opening of the valve body 1. Under the premise of ensuring sealing, the transition seat can have a slight floating under the pressure of the valve core 3, so as to ensure that the two transition seat planes are perfectly matched with the two planes of the valve core 3.

[0063] As Figure 13As shown, the outer shape structure of the transition seat, the outer side surface 213 of the transition seat is installed in the way of inserting and sheathing and end surface compression installation with the connecting pipe, the outer side surface of the transition seat 2 has an end surface slot, which is sealed and connected with the end surface plane of the connecting pipe inserted into the valve body, and an elastic sealing element 23 is also arranged at the position of the end surface of the connecting pipe, so as to ensure that there is no leakage between the transition seat 2 and the connecting pipe of the valve body, and the elastic sealing element 23 has an elastic amount, so that the transition seat 2 can have a slight floating; the outer side surface 213 can not be in contact with the inner wall of the valve body 1;

[0064] The inner side surface 212 of the three transition seats 2 forms a “kan” shape; the included angle between the inner side surfaces 212 is preferably 90°;

[0065] The valve core 3 is installed in the “kan” shaped space formed by the inner side surface 212 of the transition seat 2; the valve core 3 has four side surfaces, three edges of the cross section of the valve core 3 are straight and perpendicular to each other, and the other edge is a circular arc, the three straight edges are matched with the planes of the inner side surfaces 212 of the three transition seats respectively, and the arc surface is arranged at the position without the transition seat, and the valve core 3 slides axially in the valve body 1;

[0066] The four side surfaces of the valve core 3 are provided with two channel openings on each surface, and the four surfaces are axially distributed, and a total of eight channel openings are arranged on the four surfaces, the channel openings are circular or square or any shape, and the sizes of the channel openings can be equal or unequal; the eight channel openings are respectively a first channel opening 301D1, a second channel opening 302E1, a third channel opening 303S1, a fourth channel opening 304C1, a fifth channel opening 305D2, a sixth channel opening 306E2, a seventh channel opening 307S2 and an eighth channel opening 308C2; the first channel opening 301D1, the second channel opening 302E1, the third channel opening 303S1 and the fourth channel opening 304C1 are arranged on the four surfaces of the left radial position 34 of the valve core; the fifth channel opening 305D2, the sixth channel opening 306E2, the seventh channel opening 307S2 and the eighth channel opening 308C2 are arranged on the four surfaces of the right radial position 35 of the valve core; the on-off relationship of the four channels of the left radial position 34 of the valve core is that the first channel opening 301D1 is communicated with the second channel opening 302E1 to form a DE channel 309, the third channel opening 303S1 is communicated with the fourth channel opening 304C1 to form an SC channel 310, and the DE channel 309 and the SC channel 310 are not communicated;

[0067] The on-off relationship of the four channels of the right radial position 35 of the valve core is that the fifth channel opening 305D2 is communicated with the eighth channel opening 308C2 to form a DC channel 311, the sixth channel opening 306E2 is communicated with the seventh channel opening 307S2 to form an ES channel 312, and the DC channel 311 and the ES channel 312 are not communicated;

[0068] If necessary, two ports of the same radial position can be axially offset; usually the first port 301D1 and the fifth port 305D2 are small in diameter and can be offset to the ends of the spool;

[0069] The DE port 309 or DC port 311 on the spool 3 is an open port, i.e. the corner part is not connected, see Figure 3 ;

[0070] The spool 3 has a spool boss 8 at the left and right ends, which is part of the left and right piston assemblies;

[0071] The spool 3 can have a boss surface around the eight ports for easy machining of the seal;

[0072] As shown in Figure 8 , the distance between the edges of the ports of the same radial position on the left and right of the spool is called the partition 313, and the width of the partition 313 is greater than or equal to the large diameter of the corresponding connector to prevent the spool 3 from being in the full-open state of the four pipelines when it is in the middle position of the connector;

[0073] The four ports of each radial position on the spool 3, three of which correspond to the transition seat holes 211 of the three transition seats, and the remaining ports correspond to the connectors on the valve body 1 that do not have transition seats; the four connectors on the valve body 1 are connected to the ports in the spool 3 through the transition seats 2, forming a two-to-two connection relationship between the connectors;

[0074] The spool 3 can also have a recess or a positioning hole at the left and right ends for easy installation of the left and right piston assemblies; at least one end of the spool 3 is installed with a spool driving mechanism 10;

[0075] As shown in Figure 4 , the spool driving mechanism 10 is pneumatic, and the spool driving mechanism 10 includes a left piston assembly 6 and a right piston assembly 7, which are installed on the spool 3 and have a certain radial clearance; when there is a free gap or an elastic gap between the spool 3 and the transition seat 2, or a gap after wear, the spool 3 can be offset radially 42 to compensate; the piston assembly is equipped with a sealing element that cooperates with the inner wall of the piston cavity 15 of the valve body 1, and the spool 3 can slide along the axial direction 41 under the pushing action of the left and right piston assemblies;

[0076] The piston cavity 15 at the two ends of the valve body is larger in diameter than the maximum diameter of the square spool, so that the square spool can be accommodated in the piston cavity 15 at the two ends of the valve body to shorten the length of the valve body 1;

[0077] If the piston cavity 15 is less than the maximum diameter of the four-lobed spool, the spool 3 cannot be accommodated in the piston cavity 15, and the spool 3 and the left and right piston assemblies can be connected by the connecting piece, in which case the valve body length will be lengthened;

[0078] The left end cover 4 and the right end cover 5 are respectively mounted at both ends of the valve body 1, and the mounting mode is welding, sealing by a sealing member, or crimping, so as to form a closed space with the valve body 1;

[0079] The connecting piece 9 is mounted on the left end cover and the right end cover, and the connecting piece 9 is a gas source connector, so as to enable the control gas to enter and exit the left and right piston cavities.

[0080] Working principle:

[0081] When the left piston cavity obtains low pressure and the right piston cavity obtains high pressure, the spool 3 moves from right to left under the thrust of the piston assembly and moves to the leftmost end, at which time the right radial position 35 of the spool is at the middle position of the valve body 1, the channel of the spool 3 is aligned with the channel of the connecting pipe, and the connecting pipe has the following connection relationship: the connecting pipe 11D is connected with the connecting pipe 14C through the DC channel 311, and the connecting pipe 13S is connected with the connecting pipe 12E through the ES channel 312.

[0082] Small valve mechanisms 26 are mounted on the left and right end covers and the end faces of the piston assemblies, the small valve mechanisms 26 are connected with the connecting piece 9, and when the spool moves to the left and right end cover positions, the small valve mechanisms 26 on the end covers are respectively blocked, so as to reduce leakage and play a buffering role.

[0083] When the left piston cavity obtains high pressure through the connecting piece 9 and the right piston cavity obtains low pressure, the spool 3 moves from left to right to the rightmost end under the thrust of the piston assembly, the left radial position 34 of the spool is at the middle position of the valve body, the channel of the spool 3 is aligned with the channel of the connecting pipe, at which time the connecting pipe has the following connection relationship: the connecting pipe 11D is connected with the connecting pipe 12E through the DE channel 309, and the connecting pipe 13S is connected with the connecting pipe 14C through the SC channel 310.

[0084] Since the connecting pipe 11D is usually connected with the system high pressure and the connecting pipe 13S is connected with the system low pressure in the air conditioner, under the action of the high and low pressure difference, no matter whether the left radial position 34 of the spool is aligned with the connecting pipe or the right radial position 35 of the spool is aligned with the connecting pipe, the spool 3 is pressed in the “U” shaped corner, so as to ensure that the two adjacent planes of the spool are always pressed and sealed with the two adjacent transition conversion seats 2, and if the transition conversion seat 2 or the spool 3 is worn or has a free gap or an elastic gap, since the spool 3 has a movable gap relative to the piston assembly, the spool 3 can be offset under the action of the pressure and be pressed and sealed with the transition conversion seat which can slightly float, so as to ensure the sealing of the high pressure channel and the low pressure channel, and thus the automatic compensation effect after wear is achieved.

[0085] Further, the small valve mechanism 26 is in communication with the adapter 9, and the small valve mechanism 26 can generate axial movement, i.e., when the valve core has not reached the left or right movement end point, the small valve mechanism 26 has been pressed closed by the end face of the valve core 3, so as to further play a buffering role;

[0086] A sensor 27 can also be installed on the left and right valve covers to monitor the position of the valve core. The sensor 27 is preferably a magnetic sensor.

[0087] As shown in the drawings, the valve core driving mechanism 10 is electric, and the valve core driving mechanism 10 comprises a rotary screw driving mechanism 100 composed of a screw 101, a rotating mechanism 102, and a nut 103. Figure 5 A valve core hole 31 is formed at the axial center position of the valve core 3, which is preferably an elongated hole, a rounded rectangular hole, or a square hole. The nut 103 is installed in the valve core hole 31 and is bound in the valve core hole 31. The nut 103 cannot rotate in the valve core hole 31 but can move radially. The nut 103 is axially bound in the valve core hole 31. One end of the screw 101 of the rotary screw driving mechanism 100 is connected to the rotating mechanism 102, and the other end cooperates with the nut 103. The rotating mechanism 102 rotates to drive the screw 101 to rotate, and the screw 101 drives the nut 103 to move along the axial direction 41, and the nut 10 drives the valve core 3 to move axially.

[0088] The rotary screw driving mechanism 100 is installed in the valve body 1 and is shielded from the outside. The adapter 9, which is a terminal plate 11, is installed on the end cover to transmit electric energy.

[0089] The rotating mechanism 102 of the screw driving mechanism 100 is composed of an electric motor or an electric motor with a speed reducer. The electric motor is preferably a direct current motor, but can also be an alternating current asynchronous motor, an alternating current synchronous motor, a servo motor, a stepping motor, etc.

[0090] The speed reducer is preferably a planetary speed reducer, but can also be a hard tooth surface speed reducer, a cycloid speed reducer, a harmonic speed reducer, etc.

[0091] A switch or opening degree control, time control, or overcurrent protection control, or brake control, or interference elimination control circuit 21 is installed in the motor circuit.

[0092] The rotary screw driving mechanism 100 is a trapezoidal screw mechanism, a roller screw, a roller screw, etc., which can convert rotation into linear motion.

[0093] The rotary screw driving mechanism 100 can also be installed outside the left or right end cover. At this time, the adapter 9 is a sealing element at the connection position of the screw 101 and the end cover. In this case, the screw driving mechanism 100 can be manually, pneumatically, or hydraulically driven.

[0094] AsFigure 6 As shown, the adapter mounting position of the valve body 1 is an outer circle inner square structure, the adapter is inserted into the inner cavity of the valve body 1 and exceeds the inner wall, and the end face of the adapter is planed, the outer side surface 213 of the transition seat is inserted into the adapter and sleeved on the outside of the adapter, and the transition seat 2 is pressed on the end face of the adapter inserted into the adapter, and the elastic sealing element 23 is mounted on the end face of the adapter;

[0095] A valve core radial limiting piece 17 is arranged at the position of the first adapter 11D in the valve body 1 to restrict the radial movement 42 of the valve core 3; the valve core radial limiting piece 17 is not sealed with the corresponding adapter, and the valve core radial limiting piece 17 and the inner side plane of the three transition seats arranged originally form a cross-section of a substantially square quadrilateral, which can have a chamfered state or an angularly disconnected state.

[0096] As shown in the figure, Figure 7 In the positions where the transition seats 2 are not arranged in the four passages of the valve body 1, a transition seat is additionally arranged, among the four adapters of the valve body 1, the adapter 11D is communicated with the right piston cavity through the self-driving pipeline 19, and the adapter 13S is communicated with the left piston cavity through the internal passage, forming a self-reversing reversing valve;

[0097] When the adapter 11D is connected with high-pressure gas or liquid and the adapter 13S is connected with low pressure, the high pressure of the adapter 11D is pressurized to the right piston cavity through the self-driving pipeline 19, the low pressure of the adapter 13S is communicated to the left piston cavity through the internal passage to form the self-driving pipeline 19, and the pressure difference between the left and right piston cavities makes the piston assembly move from the right end to the left end, the right radial position 35 of the valve core is located in the intermediate adapter position of the valve body, the on-off relationship of the adapters is that the DC passage 311 connects the adapter 11D and the adapter 14C, the ES passage 312 connects the adapter 12E and the adapter 13S, and the fluid flows from the adapter 14C to the adapter 12E;

[0098] When the adapter 13S is connected with high pressure and the adapter 11D is connected with low pressure, the high pressure is pressurized to the left piston cavity through the self-driving pipeline 19, the low pressure is communicated to the right piston cavity through the self-driving pipeline 19, and the pressure difference between the left and right piston cavities makes the piston assembly move from the left end to the right end, the left radial position 34 of the valve core is located in the intermediate adapter position of the valve body, the on-off relationship of the adapters is that the DE passage 309 connects the adapter 11D and the adapter 12E, the SC passage 310 connects the adapter 13S and the adapter 14C, and the fluid still flows from the adapter 14C to the adapter 12E;

[0099] Therefore, no matter how the high and low pressures of the adapter 11D and the adapter 13S are exchanged, the fluid always flows from the adapter 14C to the adapter 12E, and the fluid flow direction does not change.

[0100] In the above embodiment, the pipe 11D and the pipe 13S can be replaced with the pipe 12E and the pipe 14C; the left and right piston chambers connected to the self-driving pipeline 19 can also be swapped; the self-driving pipeline 19 can be built into the valve body 1 and the end cover, or it can be placed outside the valve body 1.

[0101] like Figure 8 、 9 As shown, a blocking member 16 is installed around the transition conversion seat 2 to prevent the transition conversion seat 2 from moving axially;

[0102] Alternatively, the transition seat 2 is installed in the middle of the valve body 1 with a large diameter, and the circular structures at both ends of the valve body 1 have small diameters, forming a stop at the connection between the large diameter and the small diameter to prevent the transition seat 2 from moving axially.

[0103] An annular groove 18 (a rib may also be used) or a correction piece 20 is provided at the transition position between the valve body 1 mounting pipe and the piston cavities 15 on both sides to perform circular correction on both sides of the valve body 1;

[0104] The blocking member 16 and the correcting member 20 can be integrated into one body.

[0105] like Figure 9 As shown, impact-resistant and shock-absorbing pits 22 are respectively installed on the left end cover 4 and the right end cover 5; when further shock absorption, buffering or power assistance is needed, springs or magnets can be added;

[0106] In order to improve the sealing and wear resistance of the valve core, a wear-resistant seal or wear-resistant sealing material is installed on the surface of the valve core 3. The sealing method can be any installation method such as welding, riveting or groove embedding; the wear-resistant sealing material can be metal, non-metallic polymer material or other composite materials;

[0107] The width of the spool 313 is greater than or equal to the major diameter of the pipe. Figure 8 During the movement of the valve core, when the valve core is in the middle position, the four-way fully open state can be avoided;

[0108] The connecting piece 9 is a gas-liquid joint installed at both ends of the valve body.

[0109] like Figure 10 As shown, the sealing ring used for the piston assembly is a bowl-shaped sealing ring 25; the valve body is provided with sight glasses 28 and a small valve mechanism 26 at both ends; the small valve mechanism 26 is connected to the connector 9, and a leakage channel 30 is opened inside the valve core; a leakage channel control small valve 33 is installed in the valve core leakage channel.

[0110] like Figure 11 As shown, there are three transition seats 2, the valve body 1 is circular, the connecting pipe is inserted into the thick position of the valve body wall, and the outer side surface 213 of the transition seat is pressed and sealed with the plane of the pit 24 at the connecting pipe position in the valve body 1.

[0111] As Figure 12 shown, the transition conversion seat 2 is three, the valve body 1 is circular outside, the valve body 1 is square structure inside, the pipe is inserted in the valve body 1 wall thickness position, the valve body 1 is provided with a pit inside, the plane part of the transition conversion seat outside surface 213 is pressed and sealed in the pit.

[0112] As Figure 14 shown, the valve body 1 is square valve body, four transition conversion seats are installed inside, the pipe is inserted into the valve body 1, exceeds the inner wall, the transition conversion seat outside surface 213 is sleeved on the pipe end, the elastic sealing element 23 is provided on the pipe and the transition conversion seat 2 cooperation surface.

[0113] As Figure 15 shown, the pipe position of the valve body 1 is outer circle and inner square structure, the transition conversion seat 2 and the pipe inner wall are sealed by using taper surface or convex rib or groove, the sealing element or elastic element sealing element can be installed on the cooperation surface.

[0114] As Figure 16 shown, the valve body 1 is cylindrical, three transition conversion seats are installed inside, and the three transition conversion seats are integrated structure, the transition conversion seat outside surface 213 is welded on the valve body 1 inner wall, the transition conversion seat inside surface 212 has a transition conversion seat boss 29, which is convenient for processing into sealing surface, the transition conversion seat 2 is preferably brass, and can also be other metal or nonmetal any material one or more than two;

[0115] The sealing valve seat 36 is arranged in the second passage port 302E1 and the eighth passage port 308C2 of the valve core 3; the sealing valve seat 36 can also be arranged in the fourth passage port 304C1 and the sixth passage port 306E2 of the valve core 3, and the sealing valve seat 36 is elastic; one side of the sealing valve seat 36 is sealed with the corresponding passage port on the valve core 3, and due to the pressure effect, the sealing valve seat 36 can have a small floating under the condition of ensuring sealing, and the other side of the sealing valve seat 36 is pressed and sealed with the inside surface 212 of the transition conversion seat.

[0116] Two sealing valve seats 36 are arranged in the third passage port 303S1 and the seventh passage port 307S2 of the valve core 3, the sealing valve seat 36 is elastic, can ensure sealing, and has a small floating, one side of the sealing valve seat 36 is sealed with the corresponding passage port on the valve core 3, and the other side of the sealing valve seat 36 is pressed and sealed with the inside surface 212 of the transition conversion seat; at this time, the two sealing valve seats 36 can be integrated.

[0117] As Figure 17 shown, in some specific occasions, the first pipe 11D is reserved, and any one of the second pipe 12E, the third pipe 13S and the fourth pipe 14C is removed, to form a three-way valve.

[0118] Also, all channels are not limited to be circular, but can be any shape; all connecting pipes can be corrugated pipes, and all flow channels can be special-shaped structures, and the four connecting pipes can be arbitrarily exchanged in position. In order to ensure the sealing, adding a sealing ring at a place where sealing is needed is also within the protection scope of the patent, or the internal structure of the valve is square, while the external shape is circular, the external circle is inside the square structure, and in order to ensure the flow resistance of the fluid, the most suitable flow channel of any shape is adopted, which is also within the protection scope of the patent. The chamfer or R transition between the edges of the valve is also within the protection scope of the patent.

[0119] The technical features of the above-described embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not contradict each other, they should be considered as within the scope of the present disclosure. The above-described embodiments only express several embodiments of the present disclosure, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present disclosure. It should be noted that, for those skilled in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which are all within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the appended claims.

[0120] It should be understood that technical features not described in detail in the specification are all in the prior art. Although the embodiments of the present application are described, the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative and not limiting. Those skilled in the art can make more forms under the inspiration of the present application without departing from the scope of the present patent and the protection scope of the claims, which are all within the protection scope of the present application.

Claims

1. A reversing valve characterized by comprising: The reversing valve comprises a valve body (1), a transition conversion seat (2), a valve core (3), a left end cover (4), a right end cover (5), a valve core driving mechanism (10), and a connecting piece (9); The valve body (1) is cylindrical, four channel openings are evenly arranged at the same radial position on the wall of the valve body (1), the channel openings lead to the inner cavity of the valve body (1), four pipes are arranged at the positions of the channel openings on the wall of the valve body (1), and the four pipes are respectively a first pipe (11D), a second pipe (12E), a third pipe (13S), and a fourth pipe (14C); the four pipes are sealingly installed on the wall of the valve body (1) and communicate with the inner cavity of the valve body (1); a transition conversion seat (2) is arranged at the pipe position of the inner cavity of the valve body (1), the number of the transition conversion seat (2) is three, and the transition conversion seat (2) is installed in correspondence with the three pipes of the second pipe (12E), the third pipe (13S), and the fourth pipe (14C); a conversion seat hole (211) is arranged in the middle of the transition conversion seat (2), the conversion seat hole (211) communicates with the pipes on the valve body (1) in correspondence, the transition conversion seat (2) does not exceed the center of the cylinder of the valve body (1), the inner side (212) of the transition conversion seat (2) faces the center of the cylinder of the valve body (1), the outer side (213) of the transition conversion seat (2) faces the inner wall of the valve body (1) away from the center of the valve body (1), the inner side (212) is a plane, and the outer side (213) is an arbitrary shape; the outer side (213) is sealingly connected with the pipes inserted into the valve body (1) or the inner wall of the valve body (1) around the channel openings of the valve body (1); and the transition conversion seat (2) can float; The inner sides (212) of the three transition conversion seats (2) form a "N" shaped section; the valve core (3) is arranged in the "N" shaped space formed by the inner sides (212) of the transition conversion seats (2), the valve core (3) has four sides, three edges of the section of the valve core (3) are straight edges, and the other edge is a straight edge or an arbitrary curved edge, and the three straight edges are matched with the planes of the inner sides (212) of the three transition conversion seats respectively; and the valve core (3) slides axially (41) in the valve body (1); Two channel openings are arranged on each side of the valve core (3) and are distributed axially, and a total of eight channel openings are arranged on the four sides of the valve core (3) and are respectively a first channel opening (301D1), a second channel opening (302E1), a third channel opening (303S1), a fourth channel opening (304C1), a fifth channel opening (305D2), a sixth channel opening (306E2), a seventh channel opening (307S2), and an eighth channel opening (308C2); The valve core (3) has two radial positions in axial sliding, and the two radial positions are a left radial position (34) of the valve core and a right radial position (35) of the valve core respectively; The first channel port (301D1), the second channel port (302E1), the third channel port (303S1) and the fourth channel port (304C1) are on the four faces of the valve core left radial position (34) of the valve core (3), and the on-off relationship of the four channel ports is that the first channel port (301D1) and the second channel port (302E1) are in communication to form a DE channel (309), and the third channel port (303S1) and the fourth channel port (304C1) are in communication to form an SC channel (310); The fifth channel port (305D2), the sixth channel port (306E2), the seventh channel port (307S2) and the eighth channel port (308C2) are on the four faces of the valve core right radial position (35) of the valve core (3), and the on-off relationship of the four channel ports is that the fifth channel port (305D2) and the eighth channel port (308C2) are in communication to form a DC channel (311), and the sixth channel port (306E2) and the seventh channel port (307S2) are in communication to form an ES channel (312); The first channel port (301D1) or the fifth channel port (305D2) of the valve core (3) is in communication with the first connecting pipe (11D) on the valve body (1), and the remaining channel ports are in communication with the holes (211) of the three transition conversion seats, respectively; the four connecting pipes on the valve body (1) form a two-by-two communication relationship between the connecting pipes through the channels in the valve core (3); At least one end of the valve core (3) is provided with a valve core driving mechanism (10), and the valve core driving mechanism (10) is shielded in the valve body (1); The valve body (1) is provided with a left end cover (4) and a right end cover (5) at both ends, respectively, to form a closed space with the valve body (1); at least one of the left end cover (4), the right end cover (5) or the valve body (1) is provided with a connecting piece (9).

2. A reversing valve according to claim 1, characterized in that The valve core driving mechanism (10) in the valve body (1) is pneumatic, and the valve core driving mechanism (10) comprises a left piston assembly (6) and a right piston assembly (7), which are arranged at both ends of the valve core (3), respectively; the valve core (3) has a radial gap relative to the left piston assembly (6) and the right piston assembly (7); the left piston assembly (6) and the right piston assembly (7) are matched with the inner wall of the piston cavity (15) at both ends of the valve body (1); the valve core (3) slides along the axial direction (41); the connecting piece (9) is a joint or a pipeline.

3. A reversing valve according to claim 1, wherein The valve core driving mechanism (10) in the valve body (1) is electric, and the valve core driving mechanism (10) is a screw rod driving mechanism (100); the screw rod driving mechanism (100) comprises a screw rod (101), a rotating mechanism (102) and a nut (103); the valve core (3) is provided with a valve core hole (31) at the axial center, the nut (103) is arranged in the valve core hole (31), and the nut (103) can move radially relative to the valve core (3); The screw rod (101) of the rotating screw rod driving mechanism (100) is connected with the rotating mechanism (102) at one end and cooperates with the nut (103) at the other end; the rotating mechanism (102) drives the screw rod (101) to rotate, the screw rod (101) drives the nut (103) to move along the axial direction (41), and the nut (103) drives the valve core (3) to move along the axial direction (41); the rotating screw rod driving mechanism (100) is arranged inside one end of the valve body (1) and is shielded from the outside; the rotating mechanism (102) of the rotating screw rod driving mechanism (100) is composed of a motor or a motor with a speed reducer; the rotating mechanism (102) is provided with a control circuit (21); and the adapter (9) is a terminal plate (11).

4. A reversing valve according to claim 1, wherein A valve core radial position limiting piece (17) for limiting the movement of the valve core (3) is arranged at the position of the first connecting pipe (11D) in the valve body (1).

5. A reversing valve according to claim 1, wherein A transition conversion seat is arranged at the position of the first connecting pipe (11D) in the valve body (1); a self-driving pipeline (19) is arranged in the inner core of the valve body (1) or the end cover or outside the valve body (1). Two connecting pipes at positions 180° apart from each other of the valve body (1) are respectively connected to one end of two self-driving pipelines (19), and the other ends of the two self-driving pipelines (19) are respectively connected to two ends of two piston cavities (15), so as to form a reversing valve capable of automatically reversing.

6. A reversing valve according to claim 1, wherein The connecting pipe is inserted into the inner cavity of the valve body (1), and the end portion thereof exceeds the inner wall of the valve body (1); the outer side surface (213) of the transition conversion seat (2) is directly mounted on the end portion of the connecting pipe extending into the valve body (1).

7. A reversing valve according to claim 1, wherein Elastic sealing pieces (23) are arranged at the positions where the transition conversion seat (2) cooperates with the connecting pipe.

8. A reversing valve according to claim 1, wherein The transition conversion seat (2) is composed of three parts, the outer side surface (213) of the transition conversion seat (2) is mounted on the inner wall of the valve body (1), sealing valve seats (36) are respectively arranged in the second passage port (302E1) and the eighth passage port (308C2) of the valve core (3), or in the fourth passage port (304C1) and the sixth passage port (306E2) of the valve core (3), there is a hole in the middle of the sealing valve seat (36), one side of the sealing valve seat (36) is sealed with the corresponding passage port of the valve core (3), and the other side is tightly sealed with the inner side surface (212) of the transition conversion seat; Two sealing valve seats (36) are respectively arranged in the third passage port (303S1) and the seventh passage port (307S2) of the valve core (3), there is a hole in the middle of the sealing valve seat (36), one side of the sealing valve seat (36) is sealed with the corresponding passage port of the valve core (3), and the other side is sealed with the inner side surface (212) of the transition conversion seat; the two sealing valve seats (36) can be integrated.

9. A reversing valve according to claim 1, wherein A partition (313) is arranged between two passages at the left and right radial positions of the valve core (3), and the length of the partition (313) is greater than or equal to the large diameter of the corresponding connecting pipe passage; A blocking and correcting mechanism is arranged in the valve body (1), and the blocking and correcting mechanism is composed of a blocking piece (16), a correcting piece (20), a groove (18), a convex rib or a blocking table. The transition seat (2) is provided with a blocking member (16) around the periphery to prevent axial movement of the transition seat (2); The diameter of the position where the transition seat (2) is installed in the valve body (1) is large, the diameter of the position where the piston cavity (15) at both ends of the valve body (1) is small, a blocking table is formed at the position where the large diameter and the small diameter are connected to prevent axial movement of the transition seat (2); The position where the valve body (1) is installed with a connecting pipe and the position where the piston cavity (15) at both ends of the valve body (1) is connected are provided with an annular groove (18) or a convex rib for circular correction of the piston cavity (15) of the valve body (1), or a correction member (20) is arranged to correct the position of the piston cavity (15) at both ends of the valve body (1) to be circular; The left end cover (4) and the right end cover (5) are respectively provided with an impact-resistant damping pit (22), a spring, a magnet, a passage hole or a small valve mechanism (26) for control; The small valve mechanism (26) is communicated with the connecting member (9); the left end cover (4) and the right end cover (5) or the valve body (1) at both ends are provided with a sensor (27) or a sight glass (28).

10. A reversing valve according to claim 1, wherein The connecting pipe on the barrel wall of the valve body (1) includes the first connecting pipe (11D) and any two of the second connecting pipe (12E), the third connecting pipe (13S) and the fourth connecting pipe (14C), forming a three-way valve.

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