CN219345649U - Pilot valve and switching valve - Google Patents

Abstract

The utility model provides a pilot valve and a switching valve, wherein the pilot valve comprises: the pilot valve disk seat, the pilot valve disk seat includes pedestal and guide seat, and the pedestal has guide valve pocket, first guide hole group and welding hole, and the guide seat sets up in guide valve pocket, and the guide seat has the second guide hole group with first guide hole group intercommunication, and the welding hole is used for placing the welding ring, and welding hole and first guide hole group set up at the circumference of pedestal in the interval, and the lateral wall of guide seat and the inside wall shape adaptation of pedestal, the lateral wall of guide seat and the inside wall of pedestal are through setting up the welding ring welding in the welding hole. By adopting the scheme, the welding positions of the seat body and the diversion seat are arranged near the connecting positions of the first diversion hole group and the second diversion hole group, so that the welding reliability of the seat body and the diversion seat is ensured, the sealing effect around the connecting positions of the first diversion hole group and the second diversion hole group is ensured, the condition that the second diversion Kong Zuyi in the prior art is leaked with blowby gas or fluid is avoided, and the reliability of the pilot valve is ensured.

Description

Pilot valve and switching valve

Technical Field

The utility model relates to the technical field of switching valves, in particular to a pilot valve and a switching valve.

Background

In the pilot valve in the switching valve in the prior art, a seat body is fixedly connected with a diversion seat so as to be communicated with a first diversion hole set positioned on the seat body and a second diversion hole set positioned on the diversion seat. A common connection method is welding connection, for example, pre-fixing the guide seat and the seat body, and then performing welding connection on the circumference of the bonding surface of the guide seat and the seat body. However, after the seat body and the diversion seat in the prior art are welded, gaps are easily formed between the seat body part around the first diversion hole group and the diversion seat part around the second diversion hole group, so that fluid flowing through the inside of the second diversion hole group is easy to flow out from the gaps, and fluid blowby or fluid leakage occurs.

Disclosure of Invention

The utility model provides a pilot valve and a switching valve, which are used for solving the problem of poor welding and sealing effects of a seat body and a diversion seat in the prior art.

To achieve the above object, according to one aspect of the present utility model, there is provided a pilot valve comprising: the pilot valve disk seat, the pilot valve disk seat includes pedestal and guide seat, and the pedestal has guide valve pocket, first guide hole group and welding hole, and the guide seat sets up in guide valve pocket, and the guide seat has the second guide hole group with first guide hole group intercommunication, and the welding hole is used for placing the welding ring, and welding hole and first guide hole group set up at the circumference of pedestal in the interval, and the lateral wall of guide seat and the inside wall shape adaptation of pedestal, the lateral wall of guide seat and the inside wall of pedestal are through setting up the welding ring welding in the welding hole.

Further, the first diversion hole group comprises a plurality of first diversion holes, the plurality of first diversion holes are arranged at intervals along the axial direction of the base body, the base body is provided with a symmetrical surface which divides the first diversion holes into two symmetrical parts, the plurality of welding holes are distributed symmetrically on two sides of the symmetrical surface.

Further, the seat body is divided into a plurality of shaft sections along the axial direction in turn, each shaft section is provided with a first flow hole and at least two welding holes, and the first flow hole is positioned between the two welding holes.

Further, the second diversion hole group comprises a plurality of second flow holes, the second flow holes are communicated with the first flow holes in a one-to-one correspondence manner, the second flow holes comprise first sub-holes and second sub-holes which are communicated with each other, the first sub-holes are communicated with the corresponding first flow holes, the sections of the first sub-holes are partially overlapped with the sections of the corresponding first flow holes, and the sections of the second sub-holes are partially overlapped with the sections of the first sub-holes.

Further, the flow cross section of the first sub-holes is larger than the flow cross section of the second sub-holes and the flow cross section of the first flow holes, the plurality of first sub-holes are arranged at intervals along the axial direction of the base body, any two adjacent first sub-holes are arranged at intervals along the circumferential direction of the base body, and the plurality of second sub-holes are arranged at intervals along the axial direction of the base body.

Further, the pilot valve further comprises a pilot valve body, a pilot valve core assembly and an electromagnetic assembly, wherein the pilot valve body is connected with the pilot valve seat, two ends of the pilot valve core assembly are respectively arranged in the pilot valve body and the pilot valve cavity, the electromagnetic assembly is arranged around the outer peripheral surface of the pilot valve body, and the electromagnetic assembly is used for driving the pilot valve core assembly to axially move along the pilot valve cavity so as to adjust the communication state of the valve cavity and the plurality of second sub-holes.

Further, the pilot valve core assembly comprises a core iron part, a valve core piece and a pressing part, wherein the core iron part is fixedly connected with the valve core piece, the pressing part is arranged on the valve core piece and is abutted to the flow guide seat, one side of the pressing part, which faces the flow guide seat, is provided with a flow guide cavity, the flow guide cavity is used for communicating any two adjacent second sub-holes, and the core iron part and the electromagnetic assembly drive the valve core piece to drive the pressing part to reciprocate so as to adjust the communication state of the flow guide cavity and the plurality of second sub-holes.

Further, a solder ring is disposed in the first flow hole.

Further, the welding mode of the flow guiding seat and the seat body is brazing.

According to another aspect of the present utility model, there is provided a switching valve comprising a main valve portion including a main valve chamber and a plurality of pilot valve flow passages in communication with the main valve chamber, a main valve spool assembly movably disposed within the main valve chamber, and the pilot valve described above, the pilot valve being movably disposed on the main valve portion to adjust the position of the main valve spool assembly within the main valve chamber.

By applying the technical scheme of the utility model, the utility model provides a pilot valve, which comprises the following components: the pilot valve disk seat, the pilot valve disk seat includes pedestal and guide seat, and the pedestal has guide valve pocket, first guide hole group and welding hole, and the guide seat sets up in guide valve pocket, and the guide seat has the second guide hole group with first guide hole group intercommunication, and the welding hole is used for placing the welding ring, and welding hole and first guide hole group are at the circumference of pedestal upwards interval, and the lateral wall of guide seat and the inside wall shape adaptation of pedestal, the lateral wall of guide seat and the inside wall of pedestal pass through the welding ring welding that sets up in the welding hole. By adopting the scheme, the welding holes are formed near the first diversion hole group of the seat body, and the welding connection between the seat body and the diversion seat is realized through the welding ring arranged in the welding holes, so that the welding positions of the seat body and the diversion seat are arranged near the connecting positions of the first diversion hole group and the second diversion hole group, the reliability of welding between the seat body part around the first diversion hole group and the diversion seat part around the second diversion hole group is ensured, the sealing effect around the connecting positions of the first diversion hole group and the second diversion hole group is ensured, the phenomenon that gaps are easy to occur between the seat body and the diversion seat after the welding of the first diversion hole group and the second diversion hole group in the prior art, the condition that blowby gas or fluid leakage occurs in the second diversion Kong Zuyi is avoided, and the reliability of the pilot valve is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic structural view of a pilot valve provided by an embodiment of the present utility model;

FIG. 2 shows a cross-sectional view of the pilot valve of FIG. 1;

FIG. 3 shows an enlarged view of selected locations in FIG. 2;

FIG. 4 shows a schematic structural view of the seat body of the pilot valve of FIG. 1;

FIG. 5 shows a schematic view of the structure of the deflector seat of the pilot valve of FIG. 1;

fig. 6 is a schematic structural diagram of a switching valve according to another embodiment of the present utility model;

fig. 7 shows a schematic structural view of the switching valve of fig. 6 at another view angle;

FIG. 8 shows a cross-sectional view of the switching valve of FIG. 6 in a first flow-through state;

FIG. 9 shows a cross-sectional view of the switching valve of FIG. 6 in a second flow-through state;

fig. 10 shows a cross-sectional view of the switching valve of fig. 6 from another perspective.

Wherein the above figures include the following reference numerals:

10. a pilot valve; 11. a pilot valve seat; 111. a base; 1111. a valve guide chamber; 1112. a first flow hole; 1113. welding holes; 112. a diversion seat; 1121. a second flow hole; 11211. a first sub-aperture; 11212. a second sub-aperture; 113. a plane of symmetry; 12. a pilot valve body; 131. a core iron part; 132. a valve core member; 133. a pressing part; 1331. a diversion cavity; 1332. an elastic pressing member; 13321. a fixed section; 13322. an elastic transition section; 13323. a compacting section; 1333. a flow guide; 1334. a connecting piece;

20. a main valve portion; 211. a pilot valve flow passage D; 212. a pilot valve flow passage E; 213. a pilot valve flow passage C; 214. a pilot valve flow passage S; 221. a main valve runner D; 222. a main valve flow passage E; 223. a main valve flow passage S; 224. a main valve flow passage C;

30. a main valve spool assembly.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-5, an embodiment of the present utility model provides a pilot valve 10 comprising: the pilot valve seat 11, the pilot valve seat 11 includes pedestal 111 and guide seat 112, the pedestal 111 has pilot valve chamber 1111, first guide hole group and welding hole 1113, guide seat 112 sets up in pilot valve chamber 1111, guide seat 112 has the second guide hole group that communicates with first guide hole group, welding hole 1113 is used for placing the weld ring, welding hole 1113 and first guide hole group interval set up in the circumference of pedestal 111, the lateral wall of guide seat 112 and the inside wall shape adaptation of pedestal 111, the lateral wall of guide seat 112 and the inside wall of pedestal 111 pass through the weld ring welding that sets up in welding hole 1113.

In this embodiment, by arranging the welding hole 1113 near the first diversion hole set of the seat body 111 and realizing the welding connection between the seat body 111 and the diversion seat 112 through the welding ring arranged in the welding hole 1113, the arrangement is such that the welding position of the seat body 111 and the diversion seat 112 is arranged near the connection position of the first diversion hole set and the second diversion hole set, the reliability of welding between the part of the seat body 111 around the first diversion hole set and the part of the diversion seat 112 around the second diversion hole set is ensured, the sealing effect around the connection position of the first diversion hole set and the second diversion hole set is ensured, the situation that the gap is easy to appear between the seat body 111 and the diversion seat 112 after the welding of the first diversion hole set and the second diversion hole set in the prior art, so that the condition that the second diversion Kong Zuyi is out of blowby gas or fluid is easy to appear is avoided, and the reliability of the pilot valve 10 is ensured.

As shown in fig. 1 and 4, the first deflector hole group includes a plurality of first deflector holes 1112, the plurality of first deflector holes 1112 are disposed at intervals along an axial direction of the housing 111, the housing 111 has a symmetrical surface 113 dividing the first deflector holes 1112 into symmetrical two parts, the plurality of welding holes 1113 are plural, and the plurality of welding holes 1113 are symmetrically distributed on both sides of the symmetrical surface 113. By means of the arrangement, the welding holes 1113 symmetrically distributed on the two sides of the symmetrical surface 113, reliability and comprehensiveness of welding connection of the base 111 and the guide base 112 are further guaranteed, and meanwhile machining of the welding holes 1113 is facilitated.

Specifically, the base 111 is axially divided into a plurality of shaft segments in turn, each of which is provided with a first flow hole 1112 and at least two welding holes 1113, and the first flow hole 1112 is located between the two welding holes 1113. This arrangement ensures that at least one welding hole 1113 is provided on both sides of each first flow hole 1112, and ensures the reliability of the welding seal between the inner side wall of the housing 111 and the outer side wall of the deflector 112 in the circumferential direction of any one of the first flow holes 1112.

As shown in fig. 1 to 3, the second deflector hole group includes a plurality of second flow holes 1121, the plurality of second flow holes 1121 and the plurality of first flow holes 1112 communicate in one-to-one correspondence, the second flow holes 1121 include first sub-holes 11211 and second sub-holes 11212 communicating with each other, the first sub-holes 11211 communicate with the corresponding first flow holes 1112, wherein a cross section of the first sub-holes 11211 partially coincides with a cross section of the corresponding first flow holes 1112, and a cross section of the second sub-holes 11212 partially coincides with a cross section of the first sub-holes 11211. By the arrangement, the distance between any two adjacent second sub-holes 11212 can be reduced by the correspondence between the first sub-holes 11211, the second sub-holes 11212 and the first flow holes 1112, so that the arrangement of the plurality of second sub-holes 11212 is more compact.

As shown in fig. 3 and 5, the cross section of the first sub-holes 11211 is larger than the cross section of the second sub-holes 11212 and the cross section of the first flow holes 1112, the plurality of first sub-holes 11211 are arranged at intervals along the axial direction of the base 111, any adjacent two of the first sub-holes 11211 are arranged at intervals along the circumferential direction of the base 111, and the plurality of second sub-holes 11212 are arranged at intervals along the axial direction of the base 111.

In this embodiment, the arrangement direction of the plurality of first flow holes 1112 is parallel to the axial direction of the pilot valve chamber 1111, the arrangement direction of the plurality of second sub-holes 11212 is also parallel to the axial direction of the pilot valve chamber 1111, and the connecting line between the centers of any two adjacent first sub-holes 11211 is inclined with respect to the axial direction of the pilot valve chamber 1111. Specifically, the first flow holes 1112, the first sub-holes 11211, and the second sub-holes 11212 are each provided with 3, wherein the axes of the plurality of first flow holes 1112 and the axes of the plurality of second sub-holes 11212 are each located on the same vertical plane. For the first and second flow holes 1112 and 1121 located in the middle, the first and second flow holes 1112 and 11212 are coaxial, the axis of the first sub-hole 11211 communicating with both of them, the axis of the first flow hole 1112 and the axis of the second sub-hole 11212 are located on the same horizontal plane, and the first sub-hole 11211 is located on one side of the first flow hole 1112 in the circumferential direction of the housing 111, and the second sub-hole 11212 and the first flow hole 1112 communicate with the partial areas of the first sub-hole 11211 on the side close to the first and second flow holes 1112 and 11212, respectively. For the first flow hole 1112 and the second flow hole 1121 located above (below), the axis of the first sub-hole 11211 is located below right (upper right) of the first flow hole 1112, the axis of the second sub-hole 11212 is located below left (upper left) of the first sub-hole 11211, the first flow hole 1112 communicates with an upper left (lower left) partial region of the first sub-hole 11211, and the second sub-hole 11212 communicates with a lower left (upper left) partial region of the first sub-hole 11211. The arrangement is more beneficial to compact arrangement of the plurality of second sub-holes 11212, so that the distance between any two adjacent second sub-holes 11212 is smaller than the distance between two corresponding first sub-holes 11211, and the miniaturization of the flow guiding seat 112 is facilitated. Further, the axial directions of the first plurality of flow holes 1112, the first plurality of sub-holes 11211, and the second plurality of sub-holes 11212 are parallel, thereby facilitating the processing of the plurality of holes. The flow cross section of the first sub-hole 11211 is larger than the flow cross section of the second sub-hole 11212 and the flow cross section of the first flow hole 1112, so that the flow between the first flow hole 1112 and the second sub-hole 11212 in this arrangement is ensured.

As shown in fig. 2 and 3, the pilot valve 10 further includes a pilot valve body 12, a pilot valve core assembly, and an electromagnetic assembly, wherein the pilot valve body 12 is connected with the pilot valve seat 11, two ends of the pilot valve core assembly are respectively disposed in the pilot valve body 12 and the pilot valve cavity 1111, the electromagnetic assembly is disposed around the outer circumferential surface of the pilot valve body 12, and the electromagnetic assembly is used for driving the pilot valve core assembly to move along the axial direction of the pilot valve cavity 1111 so as to adjust the communication state of the pilot valve cavity 1111 and the plurality of second sub-holes 11212. The arrangement drives the pilot valve core assembly to axially move along the pilot valve body 12 through the electromagnetic assembly so as to adjust the communication state between the second sub-holes 11212 and the pilot valve cavity 1111, and the adjustment mode is simple and reliable.

Specifically, the pilot valve core assembly comprises a core iron part 131, a valve core member 132 and a pressing part 133, wherein the core iron part 131 is fixedly connected with the valve core member 132, the pressing part 133 is arranged on the valve core member 132 and is abutted against the flow guiding seat 112, one side of the pressing part 133, which faces the flow guiding seat 112, is provided with a flow guiding cavity 1331, the flow guiding cavity 1331 is used for communicating any two adjacent second sub-holes 11212, and the core iron part 131 and the electromagnetic assembly drive the valve core member 132 to drive the pressing part 133 to reciprocate so as to adjust the communication state of the flow guiding cavity 1331 and the second sub-holes 11212.

In this embodiment, the core iron portion 131 includes a static iron core and a movable iron core, the static iron core is fixedly disposed in the pilot valve body 12 and is located at a side of the pilot valve body 12 away from the pilot valve seat 11, the movable iron core is movably disposed in the pilot valve body 12, one end of the iron core away from the static iron core is fixedly connected with the valve core member 132, so as to drive the valve core member 132 to move and adjust the communicating states of the diversion cavity 1331 and the plurality of second sub-holes 11212, wherein one end of the movable iron core away from the static iron core is provided with an annular stop protrusion, and the annular stop protrusion is matched with the top stop of the diversion seat 112. Specifically, as shown in fig. 3, in the case of the electromagnetic assembly being powered off, the plunger falls, the annular stop protrusion is in stop fit with the deflector seat 112, and at this time, the deflector chamber 1331 communicates the second sub-orifice 11212 located in the middle with the second sub-orifice 11212 located below, and the second sub-orifice 11212 located above communicates with the pilot valve chamber 1111. When the solenoid assembly is energized, the plunger rises and engages the plunger stop, at which time the diversion chamber 1331 communicates the centrally located second sub-orifice 11212 with the upwardly located second sub-orifice 11212, and the downwardly located second sub-orifice 11212 communicates with the pilot valve chamber 1111. This arrangement facilitates rapid adjustment of the communication state of the guide chamber 1331 and the plurality of second sub-holes 11212.

Optionally, as shown in fig. 3, the compressing portion 133 includes an elastic compressing element 1332, a flow guiding element 1333, and a connecting element 1334, where the elastic compressing element 1332 includes a fixing segment 13321, an elastic transition segment 13322, and a compressing segment 13323, where the elastic transition segment 13322 is used to provide a compressing elastic force for the compressing segment 13323, the fixing segment 13321 is fixedly disposed on the valve core member 132 through the connecting element 1334, one side of the compressing segment 13323 facing the valve core member 132 has a compressing protrusion, the flow guiding element 1333 is movably threaded on the valve core member 132 along a radial direction of the pilot valve cavity 1111, the thickness of the flow guiding element 1333 is greater than that of the valve core member 132, the flow guiding cavity 1331 is located on one side of the flow guiding element 1333 facing the flow guiding seat 112, the compressing protrusion is abutted with one side of the flow guiding element 1333 protruding the valve core member 132, and the other side of the flow guiding element 3 protruding the valve core member 132 is abutted with the flow guiding seat 112. By the arrangement, the compression of the guide piece 1333 is ensured, the condition that the leakage of fluid is caused by the gap between the guide piece 1333 and the guide seat 112 is avoided, and the reliability of the pilot valve 10 is ensured. The reliability of the compression of the guide piece 1333 by the elastic compression piece 1332 is further ensured by the compression protrusions arranged on the elastic compression piece 1332. Meanwhile, the guide piece 1333, the connecting piece 1334 and the elastic pressing piece 1332 are arranged on the valve core piece 132, so that synchronous lifting of the pressing part 133 and the valve core piece 132 is guaranteed, and further, the guide piece 1333 is penetrated on the valve core piece 132, so that movement of the guide piece 1333 is limited, and falling of the guide piece 1333 is prevented.

Specifically, the valve core member 132 includes a first rod segment, a connecting segment and a second rod segment, which have the same thickness and are sequentially connected, the width of the first rod segment and the width of the second rod segment are both greater than those of the second rod segment, the movable iron cores of the first rod segment and the core iron portion 131 are fixedly connected, the fixed segment 13321 of the elastic pressing member 1332 is fixedly arranged on the first rod segment through the connecting member 1334, and the thickness of the flow guiding member 1333 is greater than that of the second rod segment and is penetrated on the second rod segment. Through making the width of first pole section, second pole section be greater than the second pole section, guaranteed the structural strength of case spare 132, avoid first pole section, second pole section to penetrate connecting piece 1334 and the less circumstances that leads to case spare 132 to be fragile of water conservancy diversion spare 1333 after the surplus width, guarantee the reliability of case spare 132.

In this embodiment, a solder ring is provided in the first flow hole 1112. This arrangement further ensures the sealing effect around the plurality of connection positions between the plurality of first through holes 1112 and the plurality of second through holes 1121.

Further, the welding mode of the diversion seat 112 and the seat body 111 is brazing. In this embodiment, the welding mode adopts brazing, and the influence on the diversion seat 112 and the seat body 111 is small due to the low heating temperature of the brazing, so that the stability of the diversion seat 112 and the seat body 111 is ensured. Further, in the embodiment, brazing in the furnace is adopted, so that deformation of the welding ring is as small as possible, dimensional accuracy of the welding ring is guaranteed, and sealing effect on the periphery of the connecting position of the first deflector hole group and the second deflector hole group is further guaranteed.

As shown in fig. 6 to 10, another embodiment of the present utility model provides a switching valve including a main valve portion 20, a main valve spool assembly 30, and the pilot valve 10 described above, the main valve portion 20 including a main valve chamber and a plurality of pilot valve flow passages communicating with the main valve chamber, the plurality of pilot valve flow passages communicating with the first pilot flow hole group, the main valve spool assembly 30 being movably disposed in the main valve chamber, the pilot valve 10 being movably disposed on the main valve portion 20 to adjust a position of the main valve spool assembly 30 in the main valve chamber.

In the present embodiment, the welding position of the seat body 111 and the deflector seat 112 of the pilot valve 10 is set near the connection position of the first deflector hole group and the second deflector hole group, so that the reliability of welding between the seat body 111 portion around the first deflector hole group and the deflector seat 112 portion around the second deflector hole group is ensured, and at the same time, the sealing effect around the connection position of the first deflector hole group and the second deflector hole group is ensured, and the reliability of the pilot valve 10 and the switching valve is ensured. Wherein the pilot valve spool assembly is movably disposed to adjust the position of the main valve spool assembly 30 within the main valve chamber.

Specifically, the plurality of pilot valve runners includes a pilot valve runner D211, a pilot valve runner E212, a pilot valve runner C213, and a pilot valve runner S214, the main valve runner includes a main valve runner D221, a main valve runner E222, a main valve runner S223, and a main valve runner C224, the switching valve has a first flow state as shown in fig. 8 and a second flow state as shown in fig. 9, when the solenoid assembly is energized, the plunger moves upward and abuts against the stationary plunger, the valve member 132 and the pressing portion 133 rise with the plunger, the flow guiding cavity 1331 on the pressing portion 133 communicates the upper second sub-hole 11212 with the middle second sub-hole 11212, the lower second sub-hole 11212 communicates with the pilot valve cavity 1111, high pressure fluid flows from the main valve runner D221 through the pilot valve runner D211 into the pilot valve cavity 1111, the high pressure fluid flows into the right side cavity of the main valve core assembly 30 through the lower second sub-hole 11212, pushes the main valve core assembly 30 to move leftward, and the communication state between the plurality of main valve runners is: the main valve flow passage E222 and the main valve flow passage S223 are communicated through a communication passage provided on the main valve spool assembly 30, the main valve flow passage D221 and the main valve flow passage C224 are communicated through the cavity of the main valve portion 20, and the pilot valve flow passage S214 is used to balance the cavities on both sides of the main valve spool assembly 30, at which time the switching valve is in the first flow state. Under the condition that the electromagnetic assembly is powered off, the movable iron core moves downwards and is abutted against the guide seat 112, the valve core piece 132 and the pressing part 133 descend along with the movable iron core, the guide cavity 1331 on the pressing part 133 is communicated with the second sub-hole 11212 below and the second sub-hole 11212 in the middle, the second sub-hole 11212 above is communicated with the pilot valve cavity 1111, high-pressure fluid flows from the main valve runner D221 to the pilot valve cavity 1111 through the pilot valve runner D211, the high-pressure fluid flows into the pilot valve runner E212 through the second sub-hole 11212 above and flows into the left cavity of the main valve core assembly 30, the main valve core assembly 30 is pushed to move rightwards, and after the main valve core assembly 30 is moved, the communication states among the plurality of main valve runners are as follows: the main valve flow passage C224 and the main valve flow passage S223 are communicated through a communication passage provided on the main valve spool assembly 30, the main valve flow passage D221 and the main valve flow passage E222 are communicated through the cavity of the main valve portion 20, and the pilot valve flow passage S214 is used to balance the cavities on both sides of the main valve spool assembly 30, at which time the switching valve is in the second flow state.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A pilot valve, comprising:

the pilot valve disk seat (11), pilot valve disk seat (11) include pedestal (111) and guide seat (112), pedestal (111) have guide valve pocket (1111), first guide hole group and welding hole (1113), guide seat (112) set up in guide valve pocket (1111), guide seat (112) have with the second guide hole group of first guide hole group intercommunication, welding hole (1113) are used for placing the weld ring, welding hole (1113) with first guide hole group is in the circumference of pedestal (111) is in the interval setting, the lateral wall of guide seat (112) with the inside wall shape adaptation of pedestal (111), the lateral wall of guide seat (112) with the inside wall of pedestal (111) is through setting up the weld ring welding in welding hole (1113).

2. The pilot valve according to claim 1, characterized in that the first pilot hole group comprises a plurality of first flow holes (1112), the plurality of first flow holes (1112) being arranged at intervals along the axial direction of the seat body (111), the seat body (111) having a symmetry plane (113) dividing the first flow holes (1112) into symmetrical two parts, the plurality of welding holes (1113) being distributed symmetrically on both sides of the symmetry plane (113).

3. The pilot valve according to claim 2, characterized in that the seat (111) is divided axially into a plurality of shaft segments in turn, each of which is provided with one of the first flow openings (1112) and at least two of the welding openings (1113), and the first flow opening (1112) is located between two of the welding openings (1113).

4. The pilot valve according to claim 2, characterized in that the second pilot hole group comprises a plurality of second flow holes (1121), a plurality of the second flow holes (1121) and a plurality of the first flow holes (1112) being in one-to-one correspondence, the second flow holes (1121) comprising a first sub-hole (11211) and a second sub-hole (11212) being in communication with each other, the first sub-hole (11211) being in communication with the corresponding first flow hole (1112), wherein a cross section of the first sub-hole (11211) and a cross section of the corresponding first flow hole (1112) partly coincide, and a cross section of the second sub-hole (11212) and a cross section of the first sub-hole (11211) partly coincide.

5. The pilot valve according to claim 4, characterized in that the flow cross section of the first sub-hole (11211) is larger than the flow cross section of the second sub-hole (11212), the flow cross sections of the first flow holes (1112), a plurality of the first sub-holes (11211) are arranged at intervals along the axial direction of the seat body (111), and any adjacent two of the first sub-holes (11211) are arranged at intervals along the circumferential direction of the seat body (111), and a plurality of the second sub-holes (11212) are arranged at intervals along the axial direction of the seat body (111).

6. The pilot valve according to claim 4, further comprising a pilot valve body (12), a pilot valve core assembly and an electromagnetic assembly, wherein the pilot valve body (12) is connected with the pilot valve seat (11), two ends of the pilot valve core assembly are respectively arranged in the pilot valve body (12) and the pilot valve cavity (1111), the electromagnetic assembly is arranged around the outer circumferential surface of the pilot valve body (12), and the electromagnetic assembly is used for driving the pilot valve core assembly to move along the axial direction of the pilot valve cavity (1111) so as to adjust the communication state of the pilot valve cavity (1111) and a plurality of second sub-holes (11212).

7. The pilot valve according to claim 6, characterized in that the pilot valve core assembly comprises a core iron part (131), a core member (132) and a pressing part (133), the core iron part (131) and the core member (132) are fixedly connected, the pressing part (133) is arranged on the core member (132) and is abutted against the diversion seat (112), a diversion cavity (1331) is formed in one side, facing the diversion seat (112), of the pressing part (133), the diversion cavity (1331) is used for communicating any two adjacent second sub-holes (11212), and the core iron part (131) and the electromagnetic assembly drive the pressing part (133) to reciprocate so as to adjust the communication state of the diversion cavity (1331) and the plurality of second sub-holes (11212).

8. The pilot valve of claim 2, wherein a weld ring is disposed within the first flow bore (1112).

9. The pilot valve according to claim 1, characterized in that the guide seat (112) and the seat body (111) are welded by brazing.

10. A switching valve, characterized in that it comprises a main valve portion (20), a main valve spool assembly (30) and a pilot valve according to any one of claims 1 to 9, said main valve portion (20) comprising a main valve chamber and a plurality of pilot valve flow passages communicating with said main valve chamber, a plurality of said pilot valve flow passages communicating with said first pilot flow hole group, said main valve spool assembly (30) being movably arranged in said main valve chamber.

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