Plunger type reversing valve and air conditioning system

Abstract

The invention relates to the technical field of reversing valves, in particular to a plunger type reversing valve and an air conditioning system. The plunger type reversing valve comprises a plunger type main valve and a plunger type pilot valve, the plunger type main valve comprises a main valve body and a main valve element, the main valve element is movably installed in the main valve body, and a first sealing ring assembly is arranged between the main valve element and the main valve body; the plunger type pilot valve comprises a pilot valve body and a pilot valve element, the pilot valve body is installed on the main valve body, the pilot valve element is movably installed in the pilot valve body, and a second sealing ring assembly is arranged between the pilot valve element and the pilot valve body. The plunger type pilot valve can drive the main valve element to reciprocate along the axis of the main valve element relative to the main valve body, so that flow path switching in the main valve body is achieved. When the pilot valve element moves relative to the pilot valve body to drive the main valve element to reciprocate relative to the main valve body along the axis of the main valve element, the pilot valve element and the pilot valve body are sealed through the sealing rings, the main valve element and the main valve body are sealed through the sealing rings, the overall sealing effect is better, and the system energy efficiency can be improved easily.

Description

Technical Field

[0001] The present disclosure relates to the technical field of reversing valves, and in particular to a plunger type reversing valve and an air conditioning system. Background Art

[0002] The reversing valve generally comprises a pilot valve and a main valve. The pilot valve is used to drive the valve core of the main valve to reciprocate along its own axis relative to the valve body of the main valve to realize flow path switching in the main valve.

[0003] In the related art, both the pilot valve and the main valve realize flow path reversal by the movement of the slider, and a face seal is formed between the slider and the valve seat. During the reciprocating sliding of the slider, the face seal position is prone to wear and leakage, thereby reducing the energy efficiency of the system. Summary of the invention

[0004] The purpose of the present disclosure is to provide a plunger type reversing valve and an air conditioning system to improve the sealing effect and system energy efficiency.

[0005] Based on the above purpose, the present disclosure provides a plunger type reversing valve, comprising:

[0006] A plunger-type main valve, the plunger-type main valve comprising a main valve body and a main valve core, the main valve core being movably mounted in the main valve body, a first sealing ring assembly being arranged between the main valve core and the main valve body; and

[0007] A plunger-type pilot valve, the plunger-type pilot valve comprises a pilot valve body and a pilot valve core, the pilot valve body is mounted on the main valve body, the pilot valve core is movably mounted in the pilot valve body, a second sealing ring assembly is arranged between the pilot valve core and the pilot valve body; the plunger-type pilot valve can drive the main valve core to reciprocate along its own axis relative to the main valve body to realize flow path switching in the main valve body.

[0008] In one embodiment of the present disclosure, the main valve core includes a plurality of core shaft segments, and two adjacent core shaft segments are detachably connected.

[0009] In one embodiment of the present disclosure, the main valve body is provided with flow ports, the number of the flow ports is m, the number of the core shaft segments is n, and n=m+1;

[0010] The core shaft sections at the head end and the tail end are both provided with limit protrusions to limit the movement stroke of the main valve core.

[0011] In one embodiment of the present disclosure, among two adjacent core shaft segments, one end of one of the core shaft segments is provided with a threaded hole, and one end of the other core shaft segment is provided with an external thread matching the threaded hole.

[0012] In one embodiment of the present disclosure, the core shaft segment provided with an external thread includes a coaxially arranged threaded segment and a guide segment, one end of the guide segment is fixedly connected to the threaded segment, and the other end of the guide segment is the free end of the core shaft segment; the core shaft segment provided with a threaded hole is provided with a guide hole, and the guide hole cooperates with the guide segment so that the axes of two adjacent core shaft segments coincide.

[0013] In one embodiment of the present disclosure, one of the two adjacent core shaft segments is provided with a first annular protrusion, and the other core shaft segment is provided with a second annular protrusion. After the two adjacent core shaft segments are connected, the second annular protrusion can be arranged opposite to the first annular protrusion to form an annular groove, and the first sealing ring assembly is installed in the annular groove.

[0014] In one embodiment of the present disclosure, the first sealing ring assembly includes a sealing ring, and the width of the notch of the annular groove is smaller than the maximum width of the cross section of the sealing ring.

[0015] In one embodiment of the present disclosure, surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both inclined surfaces, so that the annular groove is a dovetail groove, or surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both bent surfaces, so that the annular groove includes a first groove portion and a second groove portion, the first groove portion is connected to the second groove portion, the groove opening of the first groove portion is the groove opening of the annular groove, and the groove bottom of the second groove portion is the groove bottom of the annular groove.

[0016] In one embodiment of the present disclosure, the plunger-type pilot valve has a pilot valve port, the pilot valve body has a first accommodating cavity and a first channel, a second channel and a third channel connected to the first accommodating cavity; the pilot valve core is disposed in the first accommodating cavity;

[0017] The plunger-type pilot valve further comprises a static iron core and a moving iron core, wherein the static iron core is fixedly connected to the pilot valve body; the moving iron core is connected to the pilot valve core and drives the pilot valve core to move, and the moving iron core is magnetically attracted or separated from the static iron core;

[0018] The main valve body has a main valve cavity and a first flow port, a second flow port, a third flow port and a fourth flow port connected to the main valve cavity, and a first flow channel, a second flow channel and a third flow channel are also arranged inside the main valve body; a first piston cavity and a second piston cavity are respectively formed at both ends of the main valve cavity, the first piston cavity is connected to the first flow channel, and the second piston cavity is connected to the third flow channel; a first piston and a second piston are respectively arranged at both ends of the main valve core;

[0019] When the moving iron core is separated from the static iron core, the second flow port is communicated with the first piston cavity through the pilot valve port, the first channel, and the first flow channel in sequence; the first flow port is communicated with the second piston cavity through the second flow channel, the second channel, the third channel, and the third flow channel in sequence; the first flow port is communicated with the fourth flow port, and the second flow port is communicated with the third flow port;

[0020] When the moving iron core and the static iron core are attracted, the second flow port is connected to the second piston chamber through the third channel and the third flow channel in sequence; the first flow port is connected to the first piston chamber through the second flow channel, the second channel, the first channel, and the first flow channel in sequence; the first flow port is connected to the third flow port, and the second flow port is connected to the fourth flow port.

[0021] In one embodiment of the present disclosure, the moving iron core is provided with a second accommodating cavity; the moving iron core has a separation position, a transition position and an attraction position which are sequentially arranged in a direction close to the stationary iron core;

[0022] The plunger-type pilot valve also includes a connecting piece and an elastic piece, wherein the connecting piece is movably installed in the second accommodating chamber, the connecting piece is fixedly connected to the pilot valve core, and a buffer space is formed between the circumferential outer surface of the connecting piece and the cavity wall of the second accommodating chamber; the elastic piece is arranged in the buffer space, and the elastic piece is configured to keep the pilot valve core in a stationary state and to communicate the pilot valve port with the first channel, and the third channel with the second channel when the moving iron core is located in the separation position and moves from the separation position to the transition position; the elastic piece is also configured to drive the pilot valve core to move when the moving iron core moves from the transition position to the attraction position, so that the pilot valve port is communicated with the third channel, and the first channel is communicated with the second channel.

[0023] In one embodiment of the present disclosure, the pilot valve body is provided with a fourth channel, the extension direction of the fourth channel is parallel to the axial direction of the pilot valve body, the fourth channel passes through the end surface of the pilot valve body, one end of the fourth channel is connected to the pilot valve port, and the other end can be connected to the first channel.

[0024] In one embodiment of the present disclosure, the pilot valve body is provided with a first limiting portion and a second limiting portion, and the first limiting portion and the second limiting portion are used to limit the moving stroke of the pilot valve core; the pilot valve core includes a rod body, and the circumferential surface of the rod body is provided with a first limiting matching portion and a second limiting matching portion;

[0025] When the first position-limiting matching portion conflicts with the first position-limiting portion, the pilot valve port is communicated with the third channel, and the first channel is communicated with the second channel;

[0026] When the second position-limiting matching portion conflicts with the second position-limiting portion, the pilot valve port is communicated with the first channel, and the third channel is communicated with the second channel.

[0027] In one embodiment of the present disclosure, the plunger-type pilot valve further comprises a pilot valve cover, the pilot valve cover is fixedly connected to the pilot valve body, and the pilot valve cover has a communication cavity;

[0028] The first limiting portion and the second limiting portion are both plate-shaped; the first limiting portion is fixedly connected to one end of the pilot valve body close to the pilot valve cover, the first limiting portion is provided with a first communicating hole, and the communicating cavity is communicated with the fourth channel through the first communicating hole;

[0029] The second limiting portion is fixedly connected to an end of the pilot valve body away from the pilot valve cover, and the second limiting portion is provided with a second communicating hole, and the second communicating hole is communicated with the fourth channel;

[0030] The first limiting fitting portion includes a first limiting ring, and the second limiting fitting portion includes a second limiting ring; the second sealing ring assembly is arranged between the first limiting ring and the second limiting ring, and the second sealing ring assembly can switch between a first set position and a second set position in the first accommodating cavity;

[0031] In the first setting position, the second sealing ring assembly enables the pilot valve port to communicate with the first channel through the second communicating hole, the fourth channel, the first communicating hole, the communicating cavity in sequence, and enables the third channel to communicate with the second channel;

[0032] In the second setting position, the second sealing ring assembly can make the pilot valve port communicate with the third passage, and the first passage communicate with the second passage.

[0033] In one embodiment of the present disclosure, the first accommodating chamber includes four first sub-cavities and three second sub-cavities, the first sub-cavities and the second sub-cavities are alternately arranged and connected along the axial direction of the pilot valve body, the diameter of the first sub-cavity is smaller than the diameter of the second sub-cavity, and the first channel, the second channel and the third channel correspond to and are connected with the three second sub-cavities respectively.

[0034] In one embodiment of the present disclosure, the second sealing ring assembly includes four sealing rings. In the first set position, along the direction from one end of the pilot valve core connected to the connecting piece to the other end, the second sealing ring seals the second first sub-cavity, and the fourth sealing ring seals the fourth first sub-cavity; in the second set position, the first sealing ring seals the first first sub-cavity, and the third sealing ring seals the third first sub-cavity.

[0035] In one embodiment of the present disclosure, the first accommodating cavity further includes a first expansion cavity and a second expansion cavity, and the four first sub-cavities and the three second sub-cavities are all located between the first expansion cavity and the second expansion cavity;

[0036] The first position-limiting matching portion further includes a first stop ring, and the first stop ring can interfere with the first position-limiting portion so that a gap is set between the first position-limiting portion and the first position-limiting ring;

[0037] The second position-limiting matching portion further includes a second stop ring, and the second stop ring can abut against the second position-limiting portion so that a gap is set between the second position-limiting portion and the second position-limiting ring.

[0038] In one embodiment of the present disclosure, the connecting member includes a first rod segment and a second rod segment, the first rod segment is located in the second accommodating chamber, one end of the second rod segment is connected to the first rod segment, the other end of the second rod segment is connected to the pilot valve core, and the end of the second rod segment connected to the pilot valve core is located in the communicating chamber;

[0039] The diameter of the second rod segment is smaller than that of the first rod segment, a sleeve is provided between the second rod segment and the moving iron core, the sleeve is fixedly connected to the moving iron core, the sleeve is provided with a through hole, and the second rod segment is passed through the through hole;

[0040] The elastic member is a spring, which is sleeved on the second rod segment, one end of the spring abuts against the lower surface of the first rod segment, and the other end of the spring abuts against the upper surface of the bottom of the sleeve.

[0041] In one embodiment of the present disclosure, a first seal, a second seal and a third seal are arranged between the circumferential side wall of the pilot valve body and the inner wall of the pilot valve mounting port of the main valve body, and the first seal, the second seal and the third seal are alternately arranged with the first channel, the second channel and the third channel.

[0042] In one embodiment of the present disclosure, the plunger-type main valve further includes a main valve cover having a communication valve cavity, and the communication valve cavity is used to connect the second flow port and the third flow port.

[0043] In one embodiment of the present disclosure, the circumferential outer side wall of the pilot valve body is provided with a first annular flow channel, a second annular flow channel and a third annular flow channel, the first channel, the second channel and the third channel are all multiple in number, the first flow channel is connected with each of the first channels through the first annular flow channel, the second flow channel is connected with each of the second channels through the second annular flow channel, and the third flow channel is connected with each of the third channels through the third annular flow channel.

[0044] Based on the above purpose, the present disclosure also provides an air conditioning system, including the plunger type reversing valve.

[0045] The beneficial effects of the present disclosure are mainly:

[0046] The plunger-type reversing valve provided by the present invention has a first sealing ring assembly between the main valve core and the main valve body, and a second sealing ring assembly between the pilot valve core and the pilot valve body. When the pilot valve core moves relative to the pilot valve body, the pilot valve core and the pilot valve body are sealed by the sealing ring. At the same time, when the plunger-type pilot valve drives the main valve core to move back and forth along its own axis relative to the main valve body, the main valve core and the main valve body are also sealed by the sealing ring. The overall sealing effect is better, which is beneficial to reducing the risk of leakage and improving the energy efficiency of the system during the flow path switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A schematic diagram of the structure of a plunger type reversing valve provided in an embodiment of the present disclosure;

[0049] Figure 2 A front view of a plunger type reversing valve provided in an embodiment of the present disclosure;

[0050] Figure 3 for Figure 2 A cross-sectional view along line EE;

[0051] Figure 4 A schematic diagram of the internal structure of a plunger-type reversing valve provided in an embodiment of the present disclosure (the moving iron core is in a separated position);

[0052] Figure 5 A schematic diagram of the internal structure of a plunger-type reversing valve provided in an embodiment of the present disclosure (the moving iron core is in the attracted position).

[0053] Figure 6 Schematic diagram of the internal structure of the plunger-type main valve in the embodiment of the present disclosure;

[0054] Figure 7 for Figure 6 A partial enlarged view of point Ⅰ in the middle;

[0055] Figure 8 It is a structural schematic diagram of the main valve core in the embodiment of the present disclosure;

[0056] Fig. 9 A half-section view of the main valve core in the embodiment of the present disclosure;

[0057] Fig.10 for Fig. 9 A partial enlarged view of the middle II;

[0058] Fig.11 It is a schematic structural diagram of the first mandrel segment in an embodiment of the present disclosure;

[0059] Fig.12 is a half-section view of the first mandrel segment in the embodiment of the present disclosure;

[0060] Fig.13 It is a schematic structural diagram of the second mandrel segment in the embodiment of the present disclosure;

[0061] Fig.14 is a half-section view of the second mandrel segment in the embodiment of the present disclosure;

[0062] Fig.15 is a schematic structural diagram of the third mandrel segment in the embodiment of the present disclosure;

[0063] Fig.16 is a half-section view of the third mandrel segment in the embodiment of the present disclosure;

[0064] Fig.17 is a schematic structural diagram of a fourth core shaft segment in an embodiment of the present disclosure;

[0065] Fig.18 is a half-section view of a fourth mandrel segment in an embodiment of the present disclosure;

[0066] Fig.19 is a schematic structural diagram of the fifth mandrel segment in the embodiment of the present disclosure;

[0067] Fig. 20 is a half-section view of the fifth mandrel segment in the embodiment of the present disclosure;

[0068] Fig.21 It is a structural schematic diagram of the main valve body in an embodiment of the present disclosure;

[0069] Fig. 22The internal structure of the plunger type pilot valve in the embodiment of the present disclosure is shown in FIG. Figure 1 (The moving iron core is in the separated position);

[0070] Fig.23 The internal structure of the plunger type pilot valve in the embodiment of the present disclosure is shown in FIG. Figure 2 (The moving iron core is in the separated position);

[0071] Fig.24 Schematic diagram of the structure of the plunger-type pilot valve in the embodiment of the present disclosure (the moving iron core is in the attracted position);

[0072] Fig.25 It is a structural schematic diagram of the pilot valve body in the embodiment of the present disclosure;

[0073] Fig.26 The internal structure of the pilot valve body in the embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0074] Fig. 27 The internal structure of the pilot valve body in the embodiment of the present disclosure is shown in FIG. Figure 2 ;

[0075] Fig.28 is a schematic structural diagram of a first limiting portion in an embodiment of the present disclosure;

[0076] Fig.29 It is a structural schematic diagram of the pilot valve core in the embodiment of the present disclosure;

[0077] Fig.30 Schematic diagram of the structure of the moving iron core in the embodiment of the present disclosure.

[0078] The following are the descriptions of the reference numerals:

[0079] 1-main valve core; 10-first core shaft section; 101-first threaded hole; 102-first guide hole; 103-first annular protrusion A; 1031-first wall surface; 1032-second wall surface; 104-first limiting protrusion; 20-second core shaft section; 201-first threaded section; 202-first guide section; 203-second guide section; 204-second threaded section; 205-first connecting section; 206-second annular protrusion A; 2061-first wall surface; 2062-second wall surface; 207-second annular protrusion B; 30-third core shaft section; 301-second threaded hole; 302-second guide hole; 303-third threaded hole; 304-third guide hole; 305-first annular protrusion B; 306-first annular Protrusion C; 40-fourth mandrel section; 401-third guide section; 402-third threaded section; 403-second connecting section; 404-fourth threaded section; 405-fourth guide section; 406-second annular protrusion C; 407-second annular protrusion D; 50-fifth mandrel section; 501-fourth threaded hole; 502-fourth guide hole; 503-first annular protrusion D; 504-second limiting protrusion; 601-sealing ring; 602-first annular groove; 70-first piston; 80-second piston; 2-main valve body; 21-first flow port; 22-second flow port; 23-third flow port; 24-fourth flow port; 25-first flow channel; 26-second flow channel; 27-third flow channel; 28-pilot valve installation port; 29 1-first end cover; 2911-first piston chamber; 2912-communication port; 292-second end cover; 2921-second piston chamber; 3-main valve cover; 31-communication valve chamber; 4-pilot valve body; 41-first accommodating chamber; 411-first sub-chamber A; 412-first sub-chamber B; 413-first sub-chamber C; 414-first sub-chamber D; 415-second sub-chamber A; 416-second sub-chamber B; 417-second sub-chamber C; 418-first expansion chamber; 419-second expansion chamber; 42-pilot valve port; 43-first channel; 44-second channel; 45-third channel; 46-fourth channel; 471-first sealing member; 472-second sealing member; 473-third sealing member; 481-first annular protrusion; 48 2-second annular protrusion; 483-sealing groove; 5-pilot valve core; 51-rod body; 521-first limiting ring; 522-first stop ring; 531-second limiting ring; 532-second stop ring; 541-first sealing ring; 542-second sealing ring; 543-third sealing ring; 544-fourth sealing ring; 55-second annular groove; 6-pilot valve cover; 61-connecting chamber; 71-static iron core; 72-moving iron core; 721-second accommodating chamber; 722-sleeve; 8-connecting piece; 81-first rod section; 82-second rod section; 9-elastic piece; 100-first limiting part; 1001-first connecting hole; 200-second limiting part; 2001-second connecting hole; 300-reset spring; 400-sleeve. DETAILED DESCRIPTION

[0080] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0081] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0082] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0083] See also Figures 1 to 30 As shown, this embodiment provides a plunger type reversing valve, including a plunger type main valve and a plunger type pilot valve, the plunger type main valve includes a main valve core 1 and a main valve body 2, the main valve core 1 is movably installed in the main valve body 2, and a first sealing ring assembly is arranged between the main valve core 1 and the main valve body 2; the plunger type pilot valve includes a pilot valve body 4 and a pilot valve core 5, the pilot valve body 4 is installed in the main valve body 2, the pilot valve core 5 is movably installed in the pilot valve body 4, and a second sealing ring assembly is arranged between the pilot valve core 5 and the pilot valve body 4; the plunger type pilot valve can drive the main valve core 1 to reciprocate along its own axis relative to the main valve body 2 to realize flow path switching in the main valve body 2.

[0084] The plunger-type reversing valve provided in the present embodiment has a first sealing ring assembly arranged between the main valve core 1 and the main valve body 2, and a second sealing ring assembly arranged between the pilot valve core 5 and the pilot valve body 4. When the pilot valve core 5 moves relative to the pilot valve body 4, the pilot valve core 5 and the pilot valve body 4 are sealed by the sealing ring. At the same time, when the plunger-type pilot valve drives the main valve core 1 to reciprocate along its own axis relative to the main valve body 2, the main valve core 1 and the main valve body 2 are also sealed by the sealing ring. The overall sealing effect is better, which is beneficial to reduce the risk of leakage and improve the energy efficiency of the system during the flow path switching process.

[0085] In one embodiment, the main valve core 1 includes a plurality of core shaft segments, and two adjacent core shaft segments are detachably connected.

[0086] By providing a plurality of core shaft segments, the length of a single part is reduced during processing, and the processing is more convenient. When in use, two adjacent core shaft segments are assembled to form a complete valve core.

[0087] It should be understood that the detachable connection between two adjacent core shaft segments may be a threaded connection, a plug-in connection, or other detachable connection methods.

[0088] In one embodiment, the main valve body 2 is provided with flow ports, the number of the flow ports is m, the number of the core shaft segments is n, and n=m+1; the core shaft segments located at the head end and the tail end are provided with limiting protrusions to limit the movement stroke of the main valve core 1.

[0089] Exemplarily, the number of the flow openings is four, and correspondingly, the number of the mandrel segments is five.

[0090] See also Figure 6 As shown, the four flow ports are respectively the first flow port 21, the second flow port 22, the third flow port 23 and the fourth flow port 24, wherein the first flow port 21 and the second flow port 22 are arranged on one side of the valve body, and the third flow port 23 and the fourth flow port 24 are arranged on the other side of the valve body.

[0091] In one embodiment, among two adjacent core shaft segments, one end of one core shaft segment is provided with a threaded hole, and one end of the other core shaft segment is provided with an external thread matching the threaded hole.

[0092] The technical solution of this embodiment is described in detail below by taking the number of core shaft segments as five as an example.

[0093] For example, see Figure 8As shown, the five core shaft segments are respectively the first core shaft segment 10, the second core shaft segment 20, the third core shaft segment 30, the fourth core shaft segment 40 and the fifth core shaft segment 50, and the second core shaft segment 20 has the same structure as the fourth core shaft segment 40; the first core shaft segment 10 is detachably connected to one end of the second core shaft segment 20, the other end of the second core shaft segment 20 is detachably connected to one end of the third core shaft segment 30, the other end of the third core shaft segment 30 is detachably connected to one end of the fourth core shaft segment 40, and the other end of the fourth core shaft segment 40 is detachably connected to the fifth core shaft segment 50; the first core shaft segment 10 and the fifth core shaft segment 50 are both provided with limiting protrusions to limit the moving stroke of the main valve core 1.

[0094] For example, see Figures 11 to 20 As shown, the first core shaft segment 10 is generally in the shape of a round rod, and a first threaded hole 101 is provided at one end of the first core shaft segment 10, a second threaded hole 301 is provided at one end of the third core shaft segment 30, a third threaded hole 303 is provided at the other end of the third threaded hole 402, and a fourth threaded hole 501 is provided at one end of the fifth core shaft segment 50; an external thread matching the first threaded hole 101 is provided at one end of the second core shaft segment 20, and an external thread matching the second threaded hole 301 is provided at the other end of the second core shaft segment 20; an external thread matching the third threaded hole 303 is provided at one end of the fourth core shaft segment 40, and an external thread matching the fourth threaded hole 501 is provided at the other end of the fourth core shaft segment 40.

[0095] The limiting protrusion provided on the first core shaft segment 10 is named as the first limiting protrusion 104, and the limiting protrusion provided on the fifth core shaft segment 50 is named as the second limiting protrusion 504. The first limiting protrusion 104 is provided on the circumferential outer surface of the first core shaft segment 10, and the second limiting protrusion 504 is provided on the circumferential outer surface of the fifth core shaft segment 50 to limit the movement stroke of the main valve core 1. For example, see Figure 6 As shown, when the second limiting protrusion 504 abuts against the inner end surface of the first end (the right end in the figure) of the main valve body 2, the main valve core 1 stops moving to the right, at which time, the first flow port 21 is connected to the fourth flow port 24, and the second flow port 22 is connected to the third flow port 23. When the main valve core 1 moves to the point where the first limiting protrusion 104 abuts against the inner end surface of the second end (the left end in the figure) of the main valve body 2, the main valve core 1 stops moving to the left, at which time, the first flow port 21 is connected to the third flow port 23, and the second flow port 22 is connected to the fourth flow port 24.

[0096] In one embodiment, the core shaft segment provided with an external thread includes a coaxially arranged threaded segment and a guide segment, one end of the guide segment is fixedly connected to the threaded segment, for example, the threaded segment and the guide segment are integrally formed; the other end of the guide segment is the free end of the core shaft segment; the core shaft segment provided with a threaded hole is provided with a guide hole, and the guide hole cooperates with the guide segment so that the axes of two adjacent core shaft segments coincide.

[0097] Since there is a certain gap in the thread matching, precise positioning and guiding can be achieved by setting the guide section and the guide hole. When two adjacent core shaft sections are assembled together, the matching of the guide section and the guide hole can increase the contact area of ​​the two core shaft sections, ensuring better overall coaxiality and higher precision of the main valve core 1.

[0098] For example, see Fig. 9 , Figures 11 to 14 As shown, the first mandrel segment 10 is provided with a first guide hole 102, and the first guide hole 102 is connected with the first threaded hole 101. The second mandrel segment 20 includes a first guide segment 202 and a first threaded segment 201 which are coaxially arranged. The first guide segment 202 is located in the first guide hole 102, and the first threaded segment 201 is threadedly connected with the first threaded hole 101. The second mandrel segment 20 also includes a second guide segment 203 and a second threaded segment 204 which are coaxially arranged. The first threaded segment 201 and the second threaded segment 204 are connected by a first connecting segment 205. Exemplarily, the second mandrel segment 20 has a symmetrical structure, and the first guide segment 202, the first threaded segment 201, the first connecting segment 205, the second threaded segment 204 and the second guide segment 203 are integrally formed.

[0099] See also Fig.15 and Fig.16 As shown, a second guide hole 302 is provided at one end of the third mandrel segment 30, and the second guide hole 302 is communicated with the second threaded hole 301; the second guide segment 203 is located in the second guide hole 302, and the second threaded segment 204 is threadedly connected with the second threaded hole 301. A third guide hole 304 is provided at the other end of the third mandrel segment 30, and the third guide hole 304 is communicated with the third threaded hole 303.

[0100] See also Fig. 9 , Figures 17 to 20 As shown, the structure of the fourth core shaft segment 40 is the same as that of the second core shaft segment 20. Exemplarily, the fourth core shaft segment 40 includes a third guide segment 401, a third threaded segment 402, a second connecting segment 403, a fourth threaded segment 404 and a fourth guide segment 405 that are integrally formed; the fifth core shaft segment 50 is provided with a fourth guide hole 502, and the fourth guide hole 502 is connected to the fourth threaded hole 501; the third guide segment 401 is located in the third guide hole 304, and the third threaded segment 402 is threadedly connected to the third threaded hole 303; the fourth guide segment 405 is located in the fourth guide hole 502, and the fourth threaded segment 404 is threadedly connected to the fourth threaded hole 501.

[0101] It should be noted that the first threaded hole 101, the second threaded hole 301, the third threaded hole 303 and the fourth threaded hole 501 are respectively names for the threaded holes on different core shaft segments, the first guide segment 202, the second guide segment 203, the third guide segment 401 and the fourth guide segment 405 are respectively names for the guide segments on different core shaft segments, and the first guide hole 102, the second guide hole 302, the third guide hole 304 and the fourth guide hole 502 are respectively names for the guide holes on different core shaft segments.

[0102] In one embodiment, in order to achieve sealing, one of the two adjacent core shaft segments is provided with a first annular protrusion, and the other core shaft segment is provided with a second annular protrusion. After the two adjacent core shaft segments are connected, the second annular protrusion can be arranged opposite to the first annular protrusion to form a first annular groove 602, and the first sealing ring assembly is installed in the first annular groove 602. Figures 6 to 8 As shown, there are multiple first annular grooves 602, and the first sealing ring assembly includes multiple sealing rings 601, each sealing ring 601 is installed in a corresponding first annular groove 602. Exemplarily, the sealing ring 601 is sandwiched between the first annular protrusion and the second annular protrusion.

[0103] Exemplarily, the core shaft segment provided with a threaded hole is provided with a first annular protrusion, and the first annular protrusion is close to the end of the core shaft segment provided with the threaded hole; the core shaft segment provided with an external thread is provided with a second annular protrusion, and the second annular protrusion can be arranged opposite to the first annular protrusion after two adjacent core shaft segments are threadedly connected to form a first annular groove 602.

[0104] Exemplarily, the first mandrel segment 10 and the fifth mandrel segment 50 are respectively provided with a first annular protrusion, the third mandrel segment 30 is provided with two first annular protrusions, and the second mandrel segment 20 and the fourth mandrel segment 40 are respectively provided with two second annular protrusions. In order to clearly describe the technical solution of this embodiment, the first annular protrusion provided on the first mandrel segment 10 is named as the first annular protrusion A103, the two first annular protrusions provided on the third mandrel segment 30 are respectively named as the first annular protrusion B305 and the first annular protrusion C306, and the first annular protrusion provided on the fifth mandrel segment 50 is named as the first annular protrusion D503; the two second annular protrusions provided on the second mandrel segment 20 are respectively named as the second annular protrusion A206 and the second annular protrusion B207, and the two second annular protrusions provided on the fourth mandrel segment 40 are respectively named as the second annular protrusion C406 and the second annular protrusion D407.

[0105] The following description will be made by taking the cooperation between the first mandrel segment 10 and the second mandrel segment 20 as an example.

[0106] See also Figures 8 to 14As shown, there is a set distance between the setting position of the first annular protrusion A103 and the end face of one end of the first core shaft segment 10 close to the second core shaft segment 20. After the first core shaft segment 10 and the second core shaft segment 20 are assembled, the second annular protrusion A206 can abut against the end face of one end of the first core shaft segment 10 close to the second core shaft segment 20. At this time, the first annular protrusion A103 and the second annular protrusion A206 are respectively the groove walls of the first annular groove 602, and the portion of the first core shaft segment 10 located between the first annular protrusion A103 and the second annular protrusion A206 is the groove bottom of the first annular groove 602.

[0107] Correspondingly, a first annular groove 602 is formed between the second annular protrusion B207 and the first annular protrusion B305, a first annular groove 602 is formed between the first annular protrusion C306 and the second annular protrusion C406, and a first annular groove 602 is formed between the second annular protrusion D407 and the first annular protrusion D503.

[0108] Since the main valve core 1 in this embodiment is a split structure, it is not only easy to process, but also easy to install the sealing ring 601.

[0109] Specifically, the four sealing rings 601 are respectively sleeved on the end of the first core shaft segment 10 close to the first annular protrusion A103, the end of the third core shaft segment 30 close to the first annular protrusion B305, one end of the third core shaft segment 30 close to the first annular protrusion C306 and one end of the fifth core shaft segment 50 close to the first annular protrusion D503, the first core shaft segment 10 is threadedly connected with the second core shaft segment 20, the second core shaft segment 20 is threadedly connected with the third core shaft segment 30, the third core shaft segment 30 is threadedly connected with the fourth core shaft segment 40, and the fourth core shaft segment 40 is threadedly connected with the fifth core shaft segment 50, so that the four sealing rings 601 are respectively limitedly installed in the four first annular grooves 602.

[0110] When in use, the sealing ring 601 is installed in the first annular groove 602. Fig.10 As shown, since the width w of the groove of the first annular groove 602 is smaller than the maximum width of the cross section of the sealing ring 601, it is ensured that the sealing ring 601 has a smaller extrusion gap during movement. At the same time, it can also ensure that the sealing ring 601 fits and seals with the main valve core 1 and the main valve body 2 under the action of external force, effectively preventing the sealing ring 601 from being extruded due to high pressure.

[0111] Exemplarily, the sealing ring 601 may be an O-shaped sealing ring, the cross section of the O-shaped sealing ring is circular, and the maximum width of the cross section of the sealing ring 601 is the diameter of the cross section.

[0112] In one embodiment, the surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both bent surfaces, so that the first annular groove 602 includes a first groove portion and a second groove portion, the first groove portion is connected to the second groove portion, the groove opening of the first groove portion is the groove opening of the first annular groove 602, and the groove bottom of the second groove portion is the groove bottom of the first annular groove 602.

[0113] For example, see Fig.10 As shown, the bending surface of the first annular protrusion A103 includes a first wall surface 1031 and a second wall surface 1032, and the angle formed between the first wall surface 1031 and the second wall surface 1032 is an obtuse angle. The bending surface of the second annular protrusion A206 includes a first wall surface 2061 and a second wall surface 2062, and the angle formed between the first wall surface 2061 and the second wall surface 2062 is an obtuse angle. In this way, the first wall surface 1031 and the first wall surface 2061 form two groove walls of the first groove portion, and the second wall surface 1032 and the second wall surface 2062 form two groove walls of the second groove portion.

[0114] In other embodiments, the surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both inclined surfaces, so that the first annular groove 602 is a dovetail groove. The sealing ring 601 is installed in the dovetail groove, which can ensure that the sealing ring 601 has a smaller extrusion gap during movement. At the same time, it can also ensure that the sealing ring 601 fits and seals with the main valve core 1 and the main valve body 2 under the action of external force.

[0115] In one embodiment, see Figure 22 to Figure 27 As shown, the plunger-type pilot valve has a pilot valve port 42, the pilot valve body 4 has a first accommodating chamber 41 and a first channel 43, a second channel 44 and a third channel 45 connected to the first accommodating chamber 41; the pilot valve core 5 is arranged in the first accommodating chamber 41; the plunger-type pilot valve also includes a static iron core 71 and a moving iron core 72, the static iron core 71 is fixedly connected to the pilot valve body 4; the moving iron core 72 is magnetically attracted or separated from the static iron core 71; see Figures 3 to 5As shown, the main valve body 2 has a main valve cavity and a first flow port 21, a second flow port 22, a third flow port 23 and a fourth flow port 24 connected to the main valve cavity. The main valve body 2 is also provided with a first flow channel 25, a second flow channel 26 and a third flow channel 27; the two ends of the main valve cavity are respectively formed with a first piston cavity 2911 and a second piston cavity 2921, the first piston cavity 2911 is connected to the first flow channel 25, and the second piston cavity 2921 is connected to the third flow channel 27; the two ends of the main valve core 1 are respectively A first piston 70 and a second piston 80 are respectively provided; illustratively, both ends of the main valve body 2 are through-connected, and a first end cover 291 is provided at one end of the main valve body 2, the first end cover 291 includes a cover body and a hollow column, the diameter of the cover body is larger than the outer diameter of the hollow column, the cover body and the hollow column are integrally formed, the cover body is threadedly connected to the main valve body 2, and a seal is provided between the cover body and the end face of the main valve body 2; the hollow column is provided with a connecting port 2912, so that the first flow channel 25 can be connected with the first piston chamber 2911.

[0116] Exemplarily, the circumferential outer side wall of the pilot valve body 4 is provided with a first annular flow channel, a second annular flow channel and a third annular flow channel, the first annular flow channel, the second annular flow channel and the third annular flow channel are all annular groove-shaped and are arranged at intervals along the axial direction of the pilot valve body 4; the number of the first channel 43, the second channel 44 and the third channel 45 are all multiple, taking the first channel 43 as an example, see Fig.25 and Fig. 27 As shown, the first channel 43 is a through hole arranged at the bottom of the first annular flow channel in an annular groove shape, and a plurality of first channels 43 are arranged at intervals along the bottom of the first annular flow channel, and can generally be arranged at even intervals. The first flow channel 25 is connected to the first channel 43 through the first annular flow channel, the second flow channel 26 is connected to the second channel 44 through the second annular flow channel, and the third flow channel 27 is connected to the third channel 45 through the third annular flow channel.

[0117] The provision of the first annular flow channel facilitates the communication between the first flow channel 25 and the plurality of first channels 43 . The provision of the plurality of first channels 43 is conducive to improving the flow efficiency of the fluid and the switching speed.

[0118] A second end cover 292 is provided at the other end of the main valve body 2. The structure of the second end cover 292 is basically the same as that of the first end cover 291. A connecting port 2912 is also provided on the hollow column of the second end cover 292 so that the third flow channel 27 can be connected to the second piston chamber 2921.

[0119] See also Figure 4As shown, when the moving iron core 72 is separated from the static iron core 71, the second flow port 22 is connected to the first piston chamber 2911 through the guide valve port 42, the first channel 43, and the first flow channel 25 in sequence. At this time, the pressure in the first piston chamber 2911 is higher than the pressure in the second piston chamber 2921, and the main valve core 1 moves to the maximum limit along the arrow direction M; the second piston chamber 2921 is connected to the first flow port 21 through the third flow channel 27, the third channel 45, the second channel 44, and the second flow channel 26 in sequence. When the moving iron core 72 switches from the attracted state to the separated state, the first flow port 21 can be connected to the fourth flow port 24, and the second flow port 22 can be connected to the third flow port 23. Specifically, the plunger type reversing valve also includes a main valve cover 3, which has a connecting valve chamber 31, and the connecting valve chamber 31 is used to connect the second flow port 22 and the third flow port 23.

[0120] See also Figure 5 As shown, when the moving iron core 72 and the stationary iron core 71 are attracted, the second flow port 22 is connected to the second piston chamber 2921 through the third channel 45 and the third flow channel 27 in sequence. At this time, the pressure in the second piston chamber 2921 is higher than the pressure in the first piston chamber 2911, and the main valve core 1 moves to the maximum limit along the arrow direction N; the first piston chamber 2911 is connected to the first flow port 21 through the first flow channel 25, the first channel 43, the second channel 44, and the second flow channel 26 in sequence; at this time, the first flow port 21 can be connected to the third flow port 23, and the second flow port 22 can be connected to the fourth flow port 24.

[0121] In this embodiment, the second flow opening 22 is a high-pressure inlet, and the first flow opening 21 is a low-pressure outlet.

[0122] In one embodiment, see Fig.30 As shown, the moving iron core 72 is provided with a second accommodating cavity 721; the moving iron core 72 has a separation position, a transition position and an attraction position sequentially arranged in a direction close to the stationary iron core 71; see Fig. 22 As shown, the plunger-type pilot valve further includes a connecting member 8 and an elastic member 9. The connecting member 8 is movably installed in the second accommodating chamber 721. The connecting member 8 is fixedly connected to the pilot valve core 5. A buffer space is formed between the circumferential outer surface of the connecting member 8 and the cavity wall of the second accommodating chamber 721. The elastic member 9 is arranged in the buffer space. The elastic member 9 is configured to keep the pilot valve core 5 in a stationary state when the moving iron core 72 is located in the separation position and moves from the separation position to the transition position, and to make the pilot valve port 42 communicate with the first channel 43, and the third channel 45 communicate with the second channel 44; see Fig.24 As shown, the elastic member 9 is further configured to drive the pilot valve core 5 to move when the movable iron core 72 moves from the transition position to the closed position, so that the pilot valve port 42 is connected to the third channel 45 and the first channel 43 is connected to the second channel 44 .

[0123] Due to the provision of the elastic member 9, when the moving iron core 72 just starts to move upward, that is, when the moving iron core 72 is in the separation position and moves from the separation position to the transition position, the pilot valve core 5 is in a stationary state, and the elastic member 9 undergoes elastic deformation. At this time, the moving iron core 72 only needs to overcome the elastic force of the elastic member 9, but does not need to overcome the friction between the pilot valve core 5 and the pilot valve body 4. The resistance is small, the driving force required for the movement of the moving iron core 72 is small, and the current required for the electromagnetic coil is also small; at this time, the pilot valve port 42 is connected to the first channel 43, and the third channel 45 is connected to the second channel 44. As the moving iron core 72 moves upward, the distance between the moving iron core 72 and the static iron core 71 becomes smaller and smaller, and the magnetic attraction force of the static iron core 71 on the moving iron core 72 gradually increases. When the moving iron core 72 is in the transition position, the magnetic attraction force it receives is greater than the magnetic attraction it receives in the separation position. When the moving iron core 72 moves to the transition position, the elastic deformation of the elastic member 9 also gradually increases. Under the elastic force of the elastic member 9, the connecting member 8 and the pilot valve core 5 are driven to move toward the static iron core 71 until the moving iron core 72 moves to the attracted position. At this time, the pilot valve port 42 is connected to the third channel 45, and the first channel 43 is connected to the second channel 44, thereby realizing the control of the main valve core 1 of the reversing valve.

[0124] In one embodiment, see Fig. 22 As shown, the pilot valve body 4 is provided with a fourth channel 46, the extension direction of the fourth channel 46 is parallel to the axial direction of the pilot valve body 4, the fourth channel 46 passes through the end surface of the pilot valve body 4, one end of the fourth channel 46 is connected to the pilot valve port 42, and the other end can be connected to the first channel 43.

[0125] Exemplarily, the fourth channel 46 is an elongated through hole, which is convenient for processing on the pilot valve body 4. There is no need to set a cavity in the pilot valve core 5. The diameter of the pilot valve core 5 can be reduced, which is beneficial to the miniaturization of the pilot valve core 5, and further beneficial to reducing the friction of the pilot valve core 5 when sliding.

[0126] When the moving iron core 72 is in the separation position, the second flow port 22 is connected to the first piston chamber 2911 through the fourth channel 46, the connecting chamber 61, the first channel 43, and the first flow channel 25 in sequence. At this time, the pressure in the first piston chamber 2911 is higher than the pressure in the second piston chamber 2921, and the main valve core 1 moves to the maximum limit along the arrow direction M; the second piston chamber 2921 is connected to the first flow port 21 through the third flow channel 27, the third channel 45, the second channel 44, and the second flow channel 26 in sequence. When the moving iron core 72 switches from the attracted state to the separated state, the first flow port 21 can be connected to the fourth flow port 24, and the second flow port 22 can be connected to the third flow port 23.

[0127] In one embodiment, see Fig. 22As shown, the pilot valve body 4 is provided with a first limiting portion 100 and a second limiting portion 200, both of which are provided with a through hole for the pilot valve core 5 to pass through, and the first limiting portion 100 and the second limiting portion 200 are used to limit the moving stroke of the pilot valve core 5; see Fig.29 As shown, the pilot valve core 5 includes a rod body 51, and the circumferential surface of the rod body 51 is provided with a first limit matching portion and a second limit matching portion; see Fig.24 As shown, when the moving iron core 72 is located at the attracted position, the first limit matching portion conflicts with the first limit portion 100. At this time, the pilot valve port 42 is connected to the third channel 45, and the first channel 43 is connected to the second channel 44; see Fig. 22 and Fig.23 As shown, when the moving iron core 72 is located at the separation position, the second limiting matching portion conflicts with the second limiting portion 200 . At this time, the pilot valve port 42 is connected to the first channel 43 through the fourth channel 46 , and the third channel 45 is connected to the second channel 44 .

[0128] In one embodiment, the plunger-type pilot valve further includes a pilot valve cover 6, which is fixedly connected to the pilot valve body 4, and the pilot valve cover 6 has a connecting cavity 61; the first limiting portion 100 and the second limiting portion 200 are both plate-shaped; the first limiting portion 100 is fixedly connected to the end of the pilot valve body 4 close to the pilot valve cover 6, and the first limiting portion 100 is provided with a first connecting hole 1001, and the connecting cavity 61 is connected to the fourth channel 46 through the first connecting hole 1001; the second limiting portion 200 is fixedly connected to the end of the pilot valve body 4 away from the pilot valve cover 6, and the second limiting portion 200 is provided with a second connecting hole 2001, and the second connecting hole 2001 is connected to the fourth channel 46; the first limiting matching portion includes a second limiting matching portion. A limiting ring 521, and a second limiting matching part include a second limiting ring 531; the second sealing ring assembly is arranged between the first limiting ring 521 and the second limiting ring 531, and the second sealing ring assembly can switch between the first set position and the second set position in the first accommodating chamber 41; in the first set position, the second sealing ring assembly can make the guide valve port 42 communicate with the first channel 43 through the second connecting hole 2001, the fourth channel 46, the first connecting hole 1001, and the connecting chamber 61 in sequence, and make the third channel 45 communicate with the second channel 44; in the second set position, the second sealing ring assembly can make the guide valve port 42 communicate with the third channel 45, and the first channel 43 communicate with the second channel 44.

[0129] Exemplarily, the pilot valve body 4 includes a cylinder, the inner wall of the cylinder is provided with internal threads, the circumferential side wall of the pilot valve cover 6 is provided with external threads, the pilot valve cover 6 is threadedly connected to the cylinder of the pilot valve body 4, and a sealing ring is provided between the pilot valve cover 6 and the pilot valve body 4. Fig. 22As shown, the first limiting part 100 is fixedly connected to one end of the pilot valve body 4 close to the pilot valve cover 6. For example, the bottom of the cylinder is provided with a receiving groove, and the edge of the receiving groove is provided with a clamping part. The first limiting part 100 is installed in the receiving groove, and the first limiting part 100 is fixed in the receiving groove by the clamping part. The first limiting part 100 and the second limiting part 200 are both plate-shaped. Take the first limiting part 100 as an example, see Fig.28 As shown, the first limiting portion 100 is in the shape of a circular flat plate, and a through hole is provided at the center of the first limiting portion 100 for the pilot valve core 5 to pass through. The first limiting portion 100 is also provided with a first communicating hole 1001. The number of the first communicating holes 1001 can be multiple, and the multiple first communicating holes 1001 are arranged at intervals along the circumference of the first limiting portion 100. In this embodiment, the number of the first communicating holes 1001 is four, and the shape is fan-shaped. The four first communicating holes 1001 are evenly spaced along the circumference of the first limiting portion 100. The communicating cavity 61 is connected to the fourth channel 46 through the first communicating hole 1001. The second limiting portion 200 is fixedly connected to the end of the pilot valve body 4 away from the pilot valve cover 6. For example, the end of the pilot valve body 4 away from the cylinder is provided with a receiving groove and a clamping portion, and the clamping portion limits and fixes the second limiting portion 200 in the receiving groove. The second limiting portion 200 is provided with a through hole for the pilot valve core 5 to pass through and a plurality of second communication holes 2001 arranged at intervals along the circumference of the second limiting portion 200, and the second communication holes 2001 are communicated with the fourth channel 46. The structure of the second limiting portion 200 can be the same as that of the first limiting portion 100, and will not be repeated here.

[0130] See also Fig.29 As shown, the first limiting fitting part includes a first limiting ring 521, and the second limiting fitting part includes a second limiting ring 531; the second sealing component is arranged between the first limiting ring 521 and the second limiting ring 531, and the second sealing component can move back and forth along the axial direction of the pilot valve core 5 together with the pilot valve core 5, so as to switch between the first set position and the second set position in the first accommodating chamber 41; wherein, when the moving iron core 72 is located at the separation position, the second sealing component is in the first set position, and in the first set position, the second sealing component can make the pilot valve port 42 communicate with the first channel 43 through the second connecting hole 2001, the fourth channel 46, the first connecting hole 1001, and the connecting chamber 61 in sequence, and make the third channel 45 communicate with the second channel 44; when the moving iron core 72 is located at the suction position, the second sealing component is in the second set position, and in the second set position, the second sealing component can make the pilot valve port 42 communicate with the third channel 45, and the first channel 43 communicate with the second channel 44.

[0131] In one embodiment, the first accommodating chamber 41 includes four first sub-cavities and three second sub-cavities. The first sub-cavities and the second sub-cavities are alternately arranged and connected along the axial direction of the pilot valve body 4. The diameter of the first sub-cavity is smaller than the diameter of the second sub-cavity. The first channel 43, the second channel 44 and the third channel 45 correspond to and are connected with the three second sub-cavities respectively.

[0132] For example, see Figure 25 to Figure 27 As shown, the first sub-cavity and the second sub-cavity are coaxially arranged, and the first channel 43 , the second channel 44 and the third channel 45 are all channels extending in the radial direction of the pilot valve body 4 .

[0133] See also Fig.24 and Fig. 27 As shown, along the direction from one end where the pilot valve core 5 is connected to the connecting piece 8 to the other end, the four first sub-cavities are respectively named the first sub-cavity A411, the first sub-cavity B412, the first sub-cavity C413 and the first sub-cavity D414; the three second sub-cavities are respectively named the second sub-cavity A415, the second sub-cavity B416 and the second sub-cavity C417.

[0134] In one embodiment, the second sealing ring assembly includes four sealing rings. In the first set position, along the direction from one end where the pilot valve core 5 is connected to the connecting piece 8 to the other end, the second sealing ring seals the second first sub-chamber, and the fourth sealing ring seals the fourth first sub-chamber; in the second set position, the first sealing ring seals the first first sub-chamber, and the third sealing ring seals the third first sub-chamber.

[0135] Along the direction from one end where the pilot valve core 5 is connected to the connecting piece 8 to the other end, the four sealing rings are respectively named as the first sealing ring 541, the second sealing ring 542, the third sealing ring 543 and the fourth sealing ring 544, see Fig. 22 and Fig. 27 As shown, in the first setting position, the second sealing ring 542 seals the first sub-cavity B412, and the fourth sealing ring 544 seals the first sub-cavity D414; see Fig.24 and Fig. 27 As shown, in the second set position, the first sealing ring 541 seals the first sub-cavity A411, and the third sealing ring 543 seals the first sub-cavity C413.

[0136] The use of sealing rings has better sealing effect, which is beneficial to reducing internal leakage, thereby improving the energy efficiency of the system, that is, under the same power, the cooling and heating effects are better.

[0137] In this embodiment, see Fig.29As shown, the circumferential groove wall of the rod body 51 is also provided with four annular plates, and the four annular plates are arranged between the first limiting ring 521 and the second limiting ring 531 at intervals. The first limiting ring 521, the second limiting ring 531 and the four annular plates together form four second annular grooves 55, and each second annular groove 55 is used to place a sealing ring.

[0138] In one embodiment, see Fig. 27 As shown, the first accommodating cavity 41 further includes a first expansion cavity 418 and a second expansion cavity 419, and the four first sub-cavities and the three second sub-cavities are all located between the first expansion cavity 418 and the second expansion cavity 419; see Fig.24 As shown, the first position-limiting matching portion further includes a first stop ring 522, and the first stop ring 522 can interfere with the first position-limiting portion 100, so that a gap is set between the first position-limiting portion 100 and the first position-limiting ring 521; see Fig.23 and Fig.29 As shown, the second position limiting matching portion further includes a second stop ring 532 , and the second stop ring 532 can interfere with the second position limiting portion 200 , so that a gap is set between the second position limiting portion 200 and the second position limiting ring 531 .

[0139] The first expansion cavity 418 is located at one end of the first sub-cavity A411 away from the second sub-cavity A415, and the second expansion cavity 419 is located at one end of the first sub-cavity D414 away from the second sub-cavity C417. The provision of the first expansion cavity 418 and the second expansion cavity 419 helps to increase the flow rate and improve the performance of the pilot valve.

[0140] In order to cooperate with the first expansion cavity 418 to ensure a larger flow rate, the first limit matching part also includes a first stop ring 522. Exemplarily, the first stop ring 522 and the first limit ring 521 are integrally formed; the diameter of the first stop ring 522 is smaller than the diameter of the first limit ring 521. When the moving iron core 72 is in the attracted position, the first stop ring 522 can interfere with the first limit part 100, thereby limiting the continued movement of the guide valve core 5. At this time, a gap is set between the first limit part 100 and the first limit ring 521 to ensure that the first sealing ring 541 will not be greatly squeezed at the limit position, so that it will not be squeezed out of the second annular groove 55 due to excessive squeezing, which is beneficial to improving the sealing stability.

[0141] In order to cooperate with the second expansion cavity 419 to ensure a larger flow rate, the second limit matching part also includes a second stop ring 532. Exemplarily, the second stop ring 532 and the second limit ring 531 are integrally formed; the diameter of the second stop ring 532 is smaller than the diameter of the second limit ring 531. When the moving iron core 72 is in the separation position, the second stop ring 532 can interfere with the second limit part 200, thereby limiting the continued movement of the guide valve core 5. At this time, a gap is set between the second limit part 200 and the second limit ring 531 to ensure that the fourth sealing ring 544 will not be greatly squeezed at the limit position, so that it will not be squeezed out of the second annular groove 55 due to excessive squeezing, which is beneficial to improving the sealing stability.

[0142] In one embodiment, see Fig. 22 As shown, the connecting member 8 includes a first rod segment 81 and a second rod segment 82, the first rod segment 81 is located in the second accommodating chamber 721, one end of the second rod segment 82 is connected to the first rod segment 81, the other end of the second rod segment 82 is connected to the pilot valve core 5, and the end of the second rod segment 82 connected to the pilot valve core 5 is located in the connecting chamber 61; the diameter of the second rod segment 82 is smaller than the diameter of the first rod segment 81, a sleeve 722 is arranged between the second rod segment 82 and the moving iron core 72, the sleeve 722 is fixedly connected to the moving iron core 72, the sleeve 722 is provided with a through hole, and the second rod segment 82 is penetrated by the through hole; the elastic member 9 is a spring, the spring is sleeved on the second rod segment 82, one end of the spring abuts against the lower surface of the first rod segment 81, and the other end of the spring abuts against the upper surface of the bottom of the sleeve 722.

[0143] Exemplarily, the first rod segment 81 and the second rod segment 82 are integrally formed, and the second rod segment 82 is fixedly connected to one end of the rod body 51 of the pilot valve core 5, for example, the second rod segment 82 is interference fit with one end of the rod body 51 of the pilot valve core 5. The sleeve 722 can be fixed in the second accommodating cavity 721 by the annular claw at the bottom end of the moving iron core 72, and an installation space is formed between the inner wall of the sleeve 722 and the circumferential outer surface of the second rod segment 82, and the spring is installed in the installation space.

[0144] Exemplary, the spring can be a compression spring. Of course, the spring can also be a spring of other forms, for example, a tension spring.

[0145] When the moving iron core 72 just starts to move upward, that is, when the moving iron core 72 is in the separation position and moves from the separation position to the transition position, the pilot valve core 5 is in a stationary state and the spring is compressed. At this time, the moving iron core 72 only needs to overcome the elastic force of the spring, but does not need to overcome the friction between the pilot valve core 5 and the pilot valve body 4. The resistance is small, the driving force required for the movement of the moving iron core 72 is small, and the current required by the electromagnetic coil is also small; at this time, the pilot valve port 42 is connected to the first channel 43, and the third channel 45 is connected to the second channel 44. As the moving iron core 72 moves upward, the distance between the moving iron core 72 and the static iron core 71 becomes smaller and smaller, and the magnetic attraction force of the static iron core 71 on the moving iron core 72 gradually increases. When the moving iron core 72 is in the transition position, the magnetic attraction force it receives is greater than the magnetic attraction it receives in the separation position. When the moving iron core 72 moves to the transition position, the elastic deformation of the spring also gradually increases. Under the action of the elastic force of the spring, the connecting piece 8 and the pilot valve core 5 are driven to move in the direction close to the static iron core 71 until the moving iron core 72 moves to the attracted position. At this time, the pilot valve port 42 is connected to the third channel 45, and the first channel 43 is connected to the second channel 44, thereby realizing the control of the main valve core 1 of the reversing valve.

[0146] In one embodiment, a first seal 471, a second seal 472 and a third seal 473 are arranged between the circumferential side wall of the pilot valve body 4 and the inner wall of the pilot valve installation port 28 of the main valve body 2, and the first seal 471, the second seal 472 and the third seal 473 are alternately arranged with the first channel 43, the second channel 44 and the third channel 45. Figure 4 , Figure 5 , Fig.23 and Fig.24 As shown, after the pilot valve body 4 is installed on the main valve body 2, the first seal 471, the second seal 472 and the third seal 473 can separate the first flow channel 25, the second flow channel 26 and the third flow channel 27 inside the main valve body 2 to form different flow paths.

[0147] In one embodiment, the circumferential side wall of the pilot valve body 4 is provided with a first mounting portion, a second mounting portion and a third mounting portion, the first mounting portion is used to mount the first sealing member 471, the second mounting portion is used to mount the second sealing member 472, and the third mounting portion is used to mount the third sealing member 473. Fig. 27 As shown, the first mounting portion, the second mounting portion and the third mounting portion each include a first annular protrusion 481 and a second annular protrusion 482, and a sealing groove 483 is formed between the first annular protrusion 481 and the second annular protrusion 482. Exemplarily, the first sealing member 471, the second sealing member 472 and the third sealing member 473 are all O-rings, which are respectively installed in the sealing grooves 483.

[0148] In one embodiment, see Fig. 22 As shown, the plunger-type pilot valve further includes a return spring 300 , and when switching from power on to power off, the return spring 300 is used to return the moving iron core 72 to its original position.

[0149] In one embodiment, see Fig. 22 As shown, the plunger pilot valve also includes a sleeve 400 , a static iron core 71 and a moving iron core 72 are installed in the sleeve 400 , the static iron core 71 is fixedly connected to the sleeve 400 , and the moving iron core 72 can reciprocate along the length direction of the sleeve 400 .

[0150] This embodiment also provides an air conditioning system, including the plunger type reversing valve provided in this embodiment.

[0151] The air conditioning system provided in this embodiment has a better overall sealing effect due to the use of the plunger-type reversing valve provided in this embodiment, which is helpful in reducing the risk of leakage during the flow path switching process, thereby improving the energy efficiency of the air conditioning system.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A plunger type reversing valve, characterized in that: include: A plunger-type main valve, the plunger-type main valve comprising a main valve body and a main valve core, the main valve core being movably mounted in the main valve body, and a first sealing ring assembly being arranged between the main valve core and the main valve body; as well as A plunger-type pilot valve, the plunger-type pilot valve comprises a pilot valve body and a pilot valve core, the pilot valve body is mounted on the main valve body, the pilot valve core is movably mounted in the pilot valve body, a second sealing ring assembly is arranged between the pilot valve core and the pilot valve body; the plunger-type pilot valve can drive the main valve core to reciprocate along its own axis relative to the main valve body to realize flow path switching in the main valve body.

2. The plunger type reversing valve according to claim 1, characterized in that: The main valve core comprises a plurality of core shaft segments, and two adjacent core shaft segments are detachably connected.

3. The plunger type reversing valve according to claim 2, characterized in that: The main valve body is provided with flow ports, the number of the flow ports is m, the number of the core shaft segments is n, and n=m+1; The core shaft sections at the head end and the tail end are both provided with limit protrusions to limit the movement stroke of the main valve core.

4. The plunger type reversing valve according to claim 2, characterized in that: Among two adjacent core shaft segments, one end of one of the core shaft segments is provided with a threaded hole, and one end of the other core shaft segment is provided with an external thread matching the threaded hole.

5. The plunger type reversing valve according to claim 2, characterized in that: The core shaft segment provided with an external thread includes a coaxially arranged threaded segment and a guide segment, one end of the guide segment is fixedly connected to the threaded segment, and the other end of the guide segment is the free end of the core shaft segment; the core shaft segment provided with a threaded hole is provided with a guide hole, and the guide hole cooperates with the guide segment to make the axes of two adjacent core shaft segments coincide.

6. The plunger type reversing valve according to claim 2, characterized in that: Among the two adjacent core shaft segments, one core shaft segment is provided with a first annular protrusion, and the other core shaft segment is provided with a second annular protrusion. After the two adjacent core shaft segments are connected, the second annular protrusion can be arranged opposite to the first annular protrusion to form an annular groove, and the first sealing ring assembly is installed in the annular groove.

7. The plunger type reversing valve according to claim 6, characterized in that: The first sealing ring assembly comprises a sealing ring, and the width of the notch of the annular groove is smaller than the maximum width of the cross section of the sealing ring.

8. The plunger type reversing valve according to claim 6, characterized in that: The surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both inclined surfaces, so that the annular groove is a dovetail groove, or the surfaces of the first annular protrusion and the second annular protrusion that are close to each other are both bent surfaces, so that the annular groove includes a first groove portion and a second groove portion, the first groove portion is connected to the second groove portion, the groove opening of the first groove portion is the groove opening of the annular groove, and the groove bottom of the second groove portion is the groove bottom of the annular groove.

9. The plunger type reversing valve according to any one of claims 1 to 8, characterized in that: The plunger type pilot valve has a pilot valve port, the pilot valve body has a first accommodating cavity and a first channel, a second channel and a third channel connected to the first accommodating cavity; the pilot valve core is arranged in the first accommodating cavity; The plunger-type pilot valve further comprises a static iron core and a moving iron core, wherein the static iron core is fixedly connected to the pilot valve body; the moving iron core is connected to the pilot valve core and drives the pilot valve core to move, and the moving iron core is magnetically attracted or separated from the static iron core; The main valve body has a main valve cavity and a first flow port, a second flow port, a third flow port and a fourth flow port connected to the main valve cavity, and a first flow channel, a second flow channel and a third flow channel are also arranged inside the main valve body; a first piston cavity and a second piston cavity are respectively formed at both ends of the main valve cavity, the first piston cavity is connected to the first flow channel, and the second piston cavity is connected to the third flow channel; a first piston and a second piston are respectively arranged at both ends of the main valve core; When the moving iron core is separated from the static iron core, the second flow port is communicated with the first piston cavity through the pilot valve port, the first channel, and the first flow channel in sequence; the first flow port is communicated with the second piston cavity through the second flow channel, the second channel, the third channel, and the third flow channel in sequence; the first flow port is communicated with the fourth flow port, and the second flow port is communicated with the third flow port; When the moving iron core and the static iron core are attracted, the second flow port is connected to the second piston chamber through the third channel and the third flow channel in sequence; the first flow port is connected to the first piston chamber through the second flow channel, the second channel, the first channel, and the first flow channel in sequence; the first flow port is connected to the third flow port, and the second flow port is connected to the fourth flow port.

10. The plunger type reversing valve according to claim 9, characterized in that: The moving iron core is provided with a second accommodating cavity; the moving iron core has a separation position, a transition position and an attraction position which are sequentially arranged in a direction close to the stationary iron core; The plunger-type pilot valve also includes a connecting piece and an elastic piece, wherein the connecting piece is movably installed in the second accommodating chamber, the connecting piece is fixedly connected to the pilot valve core, and a buffer space is formed between the circumferential outer surface of the connecting piece and the cavity wall of the second accommodating chamber; the elastic piece is arranged in the buffer space, and the elastic piece is configured to keep the pilot valve core in a stationary state and to communicate the pilot valve port with the first channel, and the third channel with the second channel when the moving iron core is located in the separation position and moves from the separation position to the transition position; the elastic piece is also configured to drive the pilot valve core to move when the moving iron core moves from the transition position to the attraction position, so that the pilot valve port is communicated with the third channel, and the first channel is communicated with the second channel.

11. The plunger type reversing valve according to claim 10, characterized in that: The pilot valve body is provided with a fourth channel, the extension direction of the fourth channel is parallel to the axial direction of the pilot valve body, the fourth channel runs through the end surface of the pilot valve body, one end of the fourth channel is connected to the pilot valve port, and the other end can be connected to the first channel.

12. The plunger type reversing valve according to claim 11, characterized in that: The pilot valve body is provided with a first limiting portion and a second limiting portion, and the first limiting portion and the second limiting portion are used to limit the moving stroke of the pilot valve core; the pilot valve core includes a rod body, and the circumferential surface of the rod body is provided with a first limiting matching portion and a second limiting matching portion; When the first position-limiting matching portion conflicts with the first position-limiting portion, the pilot valve port is communicated with the third channel, and the first channel is communicated with the second channel; When the second position-limiting matching portion conflicts with the second position-limiting portion, the pilot valve port is communicated with the first channel, and the third channel is communicated with the second channel.

13. The plunger type reversing valve according to claim 12, characterized in that: The plunger type pilot valve further comprises a pilot valve cover, the pilot valve cover is fixedly connected to the pilot valve body, and the pilot valve cover has a communication cavity; The first limiting portion and the second limiting portion are both plate-shaped; the first limiting portion is fixedly connected to one end of the pilot valve body close to the pilot valve cover, the first limiting portion is provided with a first communicating hole, and the communicating cavity is communicated with the fourth channel through the first communicating hole; The second limiting portion is fixedly connected to an end of the pilot valve body away from the pilot valve cover, and the second limiting portion is provided with a second communicating hole, and the second communicating hole is communicated with the fourth channel; The first limiting fitting portion includes a first limiting ring, and the second limiting fitting portion includes a second limiting ring; the second sealing ring assembly is arranged between the first limiting ring and the second limiting ring, and the second sealing ring assembly can switch between a first set position and a second set position in the first accommodating cavity; In the first setting position, the second sealing ring assembly enables the pilot valve port to communicate with the first channel through the second communicating hole, the fourth channel, the first communicating hole, the communicating cavity in sequence, and enables the third channel to communicate with the second channel; In the second setting position, the second sealing ring assembly can make the pilot valve port communicate with the third passage, and the first passage communicate with the second passage.

14. The plunger type reversing valve according to claim 13, characterized in that: The first accommodating chamber includes four first sub-cavities and three second sub-cavities. The first sub-cavities and the second sub-cavities are alternately arranged and connected along the axial direction of the pilot valve body. The diameter of the first sub-cavity is smaller than the diameter of the second sub-cavity. The first channel, the second channel and the third channel correspond to and are connected with the three second sub-cavities respectively.

15. The plunger type reversing valve according to claim 14, characterized in that: The second sealing ring assembly includes four sealing rings. In the first set position, along the direction from one end of the pilot valve core connected to the connecting piece to the other end, the second sealing ring seals the second first sub-cavity, and the fourth sealing ring seals the fourth first sub-cavity; in the second set position, the first sealing ring seals the first first sub-cavity, and the third sealing ring seals the third first sub-cavity.

16. The plunger type reversing valve according to claim 14, characterized in that: The first accommodating cavity further includes a first expansion cavity and a second expansion cavity, and the four first sub-cavities and the three second sub-cavities are all located between the first expansion cavity and the second expansion cavity; The first position-limiting matching portion further includes a first stop ring, and the first stop ring can interfere with the first position-limiting portion so that a gap is set between the first position-limiting portion and the first position-limiting ring; The second position-limiting matching portion further includes a second stop ring, and the second stop ring can abut against the second position-limiting portion so that a gap is set between the second position-limiting portion and the second position-limiting ring.

17. The plunger type reversing valve according to claim 13, characterized in that: The connecting member comprises a first rod segment and a second rod segment, the first rod segment is located in the second accommodating chamber, one end of the second rod segment is connected to the first rod segment, the other end of the second rod segment is connected to the pilot valve core, and one end of the second rod segment connected to the pilot valve core is located in the communicating chamber; The diameter of the second rod segment is smaller than that of the first rod segment, a sleeve is provided between the second rod segment and the moving iron core, the sleeve is fixedly connected to the moving iron core, the sleeve is provided with a through hole, and the second rod segment is passed through the through hole; The elastic member is a spring, which is sleeved on the second rod segment, one end of the spring abuts against the lower surface of the first rod segment, and the other end of the spring abuts against the upper surface of the bottom of the sleeve.

18. The plunger type reversing valve according to claim 9, characterized in that: A first seal, a second seal and a third seal are arranged between the circumferential side wall of the pilot valve body and the inner wall of the pilot valve mounting port of the main valve body, and the first seal, the second seal and the third seal are alternately arranged with the first channel, the second channel and the third channel.

19. The plunger type reversing valve according to claim 9, characterized in that: The plunger type main valve further comprises a main valve cover having a communication valve cavity, wherein the communication valve cavity is used to connect the second flow port and the third flow port.

20. The plunger type reversing valve according to claim 9, characterized in that: The circumferential outer side wall of the pilot valve body is provided with a first annular flow channel, a second annular flow channel and a third annular flow channel. The number of the first channel, the second channel and the third channel is multiple. The first flow channel is connected with each of the first channels through the first annular flow channel, the second flow channel is connected with each of the second channels through the second annular flow channel, and the third flow channel is connected with each of the third channels through the third annular flow channel.

21. An air conditioning system, characterized in that: A plunger-type reversing valve comprising the plunger-type reversing valve according to any one of claims 1 to 20.

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