CN216479056U - Pilot valve and four-way valve - Google Patents

Abstract

The utility model provides a pilot valve and cross valve, include: the main valve body, the middle valve body and the auxiliary valve body are sequentially connected in a sealing manner; a core iron disposed in the main valve body so as to be movable back and forth; the sliding part is arranged in the main valve body part, the middle valve body part and the auxiliary valve body part in a penetrating way, and the sliding part is connected with the core iron so as to move along with the core iron; the capillary valve comprises a capillary C, a capillary D, a capillary E and a capillary S, wherein the capillary C and the capillary D are connected with a main valve body part; the sliding part is provided with a refrigerating position and a heating position, the capillary tube D is communicated with the capillary tube C under the condition that the sliding part is positioned at the refrigerating position, and the capillary tube S is communicated with the capillary tube E; when the slide portion is in the heating position, the capillary D communicates with the capillary E, and the capillary S communicates with the capillary C. Through the technical scheme provided by the utility model, can solve the little problem of pilot valve flow among the prior art.

Description

Pilot valve and four-way valve

Technical Field

The utility model relates to a cross valve technical field particularly, relates to a pilot valve and cross valve.

Background

Currently, four-way valves include a pilot valve, a valve seat, and a main valve, the pilot valve being used to control the operating mode of the main valve. In the prior art, the flow of a pilot valve of the four-way valve is insufficient, so that the four-way valve is slow to reverse (in the reversing process, the volume of an inner cavity of a main valve body is increased, the time for a refrigerant to flow into a capillary tube of the pilot valve to fill piston cavities at two sides is too slow, so that a sliding block moves slowly, the four-way valve is slow to reverse, and the corrupting abnormal sound is finally caused); and, the pilot valve fluid enters the pilot valve cavity from the D capillary, where the E, S and C capillary holes, which are primarily the pilot valve seats, are smaller, resulting in a lower flow rate.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pilot valve and cross valve to solve the little problem of pilot valve flow among the prior art.

In order to solve the above problem, according to the utility model discloses an aspect, the utility model provides a pilot valve, include: the main valve body, the middle valve body and the auxiliary valve body are sequentially connected in a sealing manner; a core iron disposed in the main valve body so as to be movable back and forth; the sliding part is arranged in the main valve body part, the middle valve body part and the auxiliary valve body part in a penetrating way, and the sliding part is connected with the core iron so as to move along with the core iron; the capillary valve comprises a capillary C, a capillary D, a capillary E and a capillary S, wherein the capillary C and the capillary D are connected with a main valve body part; the sliding part is provided with a refrigerating position and a heating position, the capillary tube D is communicated with the capillary tube C under the condition that the sliding part is positioned at the refrigerating position, and the capillary tube S is communicated with the capillary tube E; when the slide portion is in the heating position, the capillary D communicates with the capillary E, and the capillary S communicates with the capillary C.

Further, the main valve body part comprises a main valve body and a single valve opening piece, the core iron and the single valve opening piece are arranged in the main valve body, the capillary C is located on one side, facing the middle valve body, of the single valve opening piece, the capillary D is located on one side, facing the core iron, of the single valve opening piece, the auxiliary valve body part comprises an auxiliary valve body and an end cover which are connected with each other, and two ends of the middle valve body are connected with the main valve body and the auxiliary valve body respectively.

Further, the capillary C and the capillary D are connected with the main valve body, the capillary E is connected with the auxiliary valve body, the capillary C, the capillary D, the capillary S and the capillary E are arranged in parallel, the capillary C, the capillary S and the capillary E are located on the same side of the sliding portion, the capillary D is located on one side, away from the capillary C, of the sliding portion, and the axes of the capillary C, the capillary S, the capillary E, the capillary D and the sliding portion are located on the same plane.

Furthermore, the main valve body is provided with a first flanging opening and a third flanging opening, one end of the capillary C penetrates through the first flanging opening and is welded with the inner wall of the first flanging opening, and one end of the capillary D penetrates through the third flanging opening and is welded with the inner wall of the third flanging opening; the auxiliary valve body is provided with a second flanging opening, and one end of the capillary E penetrates through the second flanging opening and is welded with the inner wall of the second flanging opening; the side wall of the middle valve body is provided with an S mounting hole, one end of the S capillary tube penetrates into the S mounting hole and is welded, and the end face of the S capillary tube is abutted to the stop face in the S mounting hole.

Further, the main valve body part also comprises a support ring arranged in the main valve body, the support ring and the single valve opening piece are arranged at intervals, and the D capillary is positioned between the single valve opening piece and the support ring.

Further, the main valve body part is provided with a first circulation cavity, the middle valve body is provided with a second circulation cavity, the second circulation cavity is communicated with the S capillary tube, and the auxiliary valve body part is provided with a third circulation cavity; the sliding part penetrates through the first circulation cavity, the second circulation cavity and the third circulation cavity, a circulation channel is arranged in the sliding part, and D-C circulation holes and D-E circulation holes which are arranged at intervals are formed in the side wall of the sliding part, wherein the first circulation cavity is communicated with the circulation channel through the D-C circulation holes, the third circulation cavity is communicated with the circulation channel through the D-E circulation holes, and the D capillary tube is communicated with the first circulation cavity; when the sliding part is at the refrigerating position, the capillary C is communicated with the first circulation cavity, the capillary C is disconnected with the second circulation cavity, the capillary E is communicated with the second circulation cavity, and the capillary E is disconnected with the third circulation cavity; when the sliding part is in the heating position, the capillary C is disconnected with the first circulation cavity, the capillary C is communicated with the second circulation cavity, the capillary E is disconnected with the second circulation cavity, and the capillary E is communicated with the third circulation cavity.

Furthermore, one end of the first flow-through cavity facing the middle valve body is provided with a first valve port, two ends of the second flow-through cavity are respectively provided with a second valve port and a third valve port, the second valve port is positioned between the third valve port and the first valve port, and one end of the third flow-through cavity facing the middle valve body is provided with a fourth valve port; the sliding part comprises a valve rod, a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring which are sequentially arranged on the valve rod, the valve rod is connected with the core iron, and the valve rod is provided with a circulation channel, a D-C circulation hole and a D-E circulation hole; when the sliding part is positioned at a refrigerating position, the first sealing ring avoids the first valve port, the second sealing ring blocks the second valve port, the third sealing ring avoids the third valve port, and the fourth sealing ring blocks the fourth valve port; under the condition that the sliding part is in the heating position, the first sealing ring blocks the first valve port, the second sealing ring avoids the second valve port, the third sealing ring blocks the third valve port, and the fourth sealing ring avoids the fourth valve port.

Furthermore, the flow area of the D capillary is S1, the flow area between the first flow-through cavity and the valve rod is S2, the flow areas of the C capillary, the S capillary and the E capillary are S4, the flow area of the D-C flow hole is S5, the flow area of the D-E flow hole is S6, the flow area between the third flow-through cavity and the valve rod is S7, the flow area of the flow channel is S8, and the flow area of the second flow-through cavity and the valve rod is S9; when the sliding portion is in the cooling position, the flow area between the first seal ring and the first valve port is S3, and the flow area between the third seal ring and the third valve port is S10; when the sliding part is in the heating position, the flow area between the fourth sealing ring and the fourth valve port is S11, and the flow area between the second sealing ring and the second valve port is S10; wherein S8 is more than or equal to S5, more than or equal to S2, more than or equal to S3, more than or equal to S1, more than or equal to S4, and/or S8 is more than or equal to S6, more than or equal to S7, more than or equal to S11, more than or equal to S1, more than or equal to S4, and/or S9 is more than or equal to S10.

Furthermore, the D-C circulation hole is provided with a plurality of C sub-holes which are distributed along the circumferential direction of the valve rod, and two ends of each C sub-hole are respectively communicated with the circulation channel and the first circulation cavity; the D-E circulation hole is provided with a plurality of E sub-holes which are distributed along the circumferential direction of the valve rod, and two ends of each E sub-hole are respectively communicated with the circulation channel and the third circulation cavity.

Further, the valve rod comprises a rod body, and a first retaining ring, a second retaining ring, a third retaining ring, a fourth retaining ring, a fifth retaining ring and a sixth retaining ring which are sequentially arranged on the rod body, wherein the first sealing ring is positioned between the first retaining ring and the second retaining ring, the second sealing ring is positioned between the second retaining ring and the third retaining ring, the third sealing ring is positioned between the fourth retaining ring and the fifth retaining ring, and the fourth sealing ring is positioned between the fifth retaining ring and the sixth retaining ring.

Furthermore, the first valve port, the second valve port, the third valve port and the fourth valve port are all conical ports with the same size, the first baffle ring, the third baffle ring, the fourth baffle ring and the sixth baffle ring are the same size, and the second baffle ring and the fifth baffle ring are the same size, wherein the outer diameter of the first baffle ring is smaller than the outer diameter of the second baffle ring, and the outer diameter of the second baffle ring is smaller than or equal to the inner diameter of the first valve port; the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are the same in size, and the outer diameter of the first sealing ring is larger than that of the second baffle ring.

Further, the sliding part includes the valve rod, and the valve rod has the circulation passageway, and the one end of valve rod has the external screw thread, and the outer wall of valve rod has the hexagon fitting surface, and the both ends of core iron have internal thread and hexagonal counter bore, internal thread and thread fit respectively.

Furthermore, the valve rod is also provided with a first balance hole which is communicated with the circulation channel, the core iron is also provided with a second balance hole, and two ends of the second balance hole are respectively communicated with the hexagonal counter bore and the first balance hole.

Furthermore, the main valve body part also comprises an attractor and an elastic piece, the attractor is arranged in the main valve body, and the elastic piece is positioned between the attractor and the core iron; the sliding part is in a cooling position when the core iron is abutted to the support ring, and the sliding part is in a heating position when the core iron is abutted to the attractor.

Furthermore, the outer wall of the single valve port piece is provided with a first welding ring groove, and the outer wall of the single valve port piece is welded with the inner wall of the main valve body; the outer wall of the end cover is provided with a second welding ring groove, and the outer wall of the end cover is welded with the inner wall of the auxiliary valve body; the outer wall of the support ring is provided with a third welding ring groove, and the outer wall of the support ring is welded with the inner wall of the main valve body; the two ends of the middle valve body are respectively provided with a first annular step and a second annular step, the main valve body is welded with the first annular step, and the auxiliary valve body is welded with the second annular step.

According to the utility model discloses an on the other hand provides a four-way valve, and the four-way valve includes main valve and foretell pilot valve.

Use the technical scheme of the utility model, a pilot valve is provided, include: the main valve body, the middle valve body and the auxiliary valve body are sequentially connected in a sealing manner; a core iron disposed in the main valve body so as to be movable back and forth; the sliding part is arranged in the main valve body part, the middle valve body part and the auxiliary valve body part in a penetrating way, and the sliding part is connected with the core iron so as to move along with the core iron; the capillary valve comprises a capillary C, a capillary D, a capillary E and a capillary S, wherein the capillary C and the capillary D are connected with a main valve body part; the sliding part is provided with a refrigerating position and a heating position, the capillary tube D is communicated with the capillary tube C under the condition that the sliding part is positioned at the refrigerating position, and the capillary tube S is communicated with the capillary tube E; when the slide portion is in the heating position, the capillary D communicates with the capillary E, and the capillary S communicates with the capillary C. By adopting the scheme, the capillary C and the capillary D are arranged to be connected with the main valve body part, the capillary S is arranged to be connected with the middle valve body part, and the capillary E is arranged to be connected with the auxiliary valve body part; and the core iron and the sliding part are arranged, and the sliding part can move along with the core iron, so that the position switching is realized. Compared with the prior art, the technical scheme has the advantages that the core iron and other structures with higher cost are not required to be changed, and the flow of the pilot valve can be increased without changing the stroke of the core iron.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows an exploded view of a pilot valve provided by an embodiment of the present invention;

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

FIG. 3 shows a cross-sectional view of the pilot valve of FIG. 1 in a refrigerated state;

FIG. 4 shows a cross-sectional view of the pilot valve of FIG. 1 in a hot state;

FIG. 5 shows a block diagram of the valve stem of FIG. 1;

FIG. 6 shows a cross-sectional view of the valve stem of FIG. 5;

FIG. 7 shows a cross-sectional view of the core iron of FIG. 1;

FIG. 8 shows a cross-sectional view of the valve body of FIG. 1;

FIG. 9 shows a block diagram of the main valve body of FIG. 1;

FIG. 10 shows a block diagram of the secondary valve body of FIG. 1;

FIG. 11 shows a cross-sectional view of the single valve port of FIG. 1;

FIG. 12 shows a cross-sectional view of the support ring of FIG. 1;

FIG. 13 shows a cross-sectional view of the end cap of FIG. 1;

fig. 14 shows a structure diagram of a four-way valve according to another embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a main valve body portion; 11. a main valve body; 111. a first flanging opening; 112. a third flanging opening; 12. a single valve port; 121. a first welding ring groove; 13. a first flow-through chamber; 131. a first valve port; 14. an attractor; 15. an elastic member; 16. a support ring; 161. a third welding ring groove;

20. a middle valve body; 21. a second flow-through chamber; 211. a second valve port; 212. a third valve port;

30. a secondary valve body portion; 31. a sub-valve body; 311. a second flanging opening; 32. an end cap; 321. a second welding ring groove; 33. a third flow-through chamber; 331. a fourth valve port;

40. a core iron; 41. a hexagonal counter bore; 42. a second balance hole;

50. a sliding part; 51. a valve stem; 511. a flow-through channel; 512. D-C flow-through pores; 513. D-E flow-through pores; 514. a rod body; 5151. a first retainer ring; 5152. a second retainer ring; 5153. a third retainer ring; 5154. a fourth retainer ring; 5155. a fifth baffle ring; 5156. a sixth retainer ring; 516. a first balance hole; 52. a first seal ring; 53. a second seal ring; 54. a third seal ring; 55. a fourth seal ring;

61. c, capillary tube; 62. a capillary tube D; 63. e, capillary tube; 64. and (4) an S capillary.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 13, an embodiment of the present invention provides a pilot valve, including: a main valve body part 10, a middle valve body 20 and an auxiliary valve body part 30 which are sequentially connected in a sealing way; a core 40 disposed in the main valve body 10 so as to be movable back and forth; a sliding part 50 inserted into the main valve body part 10, the middle valve body 20, and the sub valve body part 30, the sliding part 50 being connected to the core iron 40 to move with the core iron 40; the capillary tube 61C, the capillary tube 62D, the capillary tube 63E and the capillary tube 64S, wherein the capillary tube 61C and the capillary tube 62D are connected with the main valve body part 10, the capillary tube 64S is connected with the middle valve body 20, and the capillary tube 63E is connected with the auxiliary valve body part 30; the sliding part 50 has a cooling position and a heating position, when the sliding part 50 is at the cooling position, the D capillary tube 62 is communicated with the C capillary tube 61, and the S capillary tube 64 is communicated with the E capillary tube 63; when the slide 50 is in the heating position, the D capillary 62 and the E capillary 63 communicate with each other, and the S capillary 64 and the C capillary 61 communicate with each other.

By adopting the scheme, the C capillary tube 61 and the D capillary tube 62 are arranged to be connected with the main valve body part, the S capillary tube 64 is arranged to be connected with the middle valve body part, and the E capillary tube 63 is arranged to be connected with the auxiliary valve body part 30; the core 40 and the slide 50 are provided, and the slide 50 can move with the core 40 to switch positions. Compared with the prior art, the scheme can realize the increase of the flow rate of the pilot valve without changing the structures of the core iron 40 with higher cost and the like and changing the stroke of the core iron 40.

The main valve body 10 includes a main valve body 11 and a single valve mouth piece 12, the core iron 40 and the single valve mouth piece 12 are both arranged in the main valve body 11, the C capillary 61 is located on one side of the single valve mouth piece 12 facing the middle valve body 20, the D capillary 62 is located on one side of the single valve mouth piece 12 facing the core iron 40, the auxiliary valve body 30 includes an auxiliary valve body 31 and an end cover 32 which are connected with each other, and two ends of the middle valve body 20 are respectively connected with the main valve body 11 and the auxiliary valve body 31. By providing the single valve port 12, communication between the slide portion 50 and the C capillary 61 is achieved; the end cover 32 is arranged, one end of the auxiliary valve body part 30 can be sealed, the other end of the auxiliary valve body part is connected with the middle valve body 20, and the connection mode can adopt welding, so that the stability and the reliability are realized.

Further, the capillary tube C61 and the capillary tube D62 are both connected with the main valve body 11, the capillary tube E63 is connected with the auxiliary valve body 31, the capillary tube C61, the capillary tube D62, the capillary tube S64 and the capillary tube E63 are arranged in parallel, the capillary tube C61, the capillary tube S64 and the capillary tube E63 are all located on the same side of the sliding portion 50, the capillary tube D62 is located on a side of the sliding portion 50 away from the capillary tube C61, and the axes of the capillary tube C61, the capillary tube S64, the capillary tube E63, the capillary tube D62 and the sliding portion 50 are all located on the same plane. Through the arrangement, the D capillary tube 62 is connected with the main valve body 11, so that fluid entering from the D capillary tube 62 can directly enter the main valve body 11, the size of the hole diameter can be set according to the pipe diameter of the D capillary tube 62, and the flow of the fluid entering the main valve body 11 is improved.

In this embodiment, the main valve body 11 has a first flanging opening 111 and a third flanging opening 112, one end of the capillary 61C penetrates through the first flanging opening 111 and is welded with the inner wall of the first flanging opening 111, and one end of the capillary 62D penetrates through the third flanging opening 112 and is welded with the inner wall of the third flanging opening 112; the auxiliary valve body 31 is provided with a second flanging opening 311, and one end of the E capillary 63 penetrates through the second flanging opening 311 and is welded with the inner wall of the second flanging opening 311; the side wall of the middle valve body 20 is provided with an S mounting hole, one end of the S capillary 64 penetrates into the S mounting hole and is welded, and the end surface of the S capillary 64 is abutted with a stop surface in the S mounting hole.

By arranging the first flanging opening 111, the welding area with one end of the C capillary 61 can be increased during welding, and the welding quality is improved; by arranging the third flanging opening 112, the welding area with one end of the D capillary 62 can be increased during welding, and the welding quality is improved; the second flanging opening 311 is arranged, so that the welding area of one end of the E capillary 63 can be increased during welding, and the welding quality is improved; the S mounting hole is formed, so that the welding area with one end of the S capillary 64 can be increased during welding, the welding quality is improved, the end face of the S capillary 64 is abutted to the stop face in the S mounting hole, the insertion depth of the S capillary 64 can be limited, and the S capillary 64 is prevented from being inserted too deeply to influence the fluid circulation.

In this embodiment, the main valve body 10 further includes a support ring 16 disposed within the main valve body 11, the support ring 16 and the single valve orifice 12 are disposed in a spaced relationship, and the D capillary 62 is located between the single valve orifice 12 and the support ring 16. The support ring 16 is arranged in the main valve body 11, so that one end of the sliding part 50 can be supported, and the stability and reliability of the sliding part 50 during reciprocating movement are improved; the placement of the D-capillary 62 between the single valve port 12 and the support ring 16 ensures smooth fluid flow.

Specifically, the main valve body portion 10 has a first through-chamber 13, the middle valve body 20 has a second through-chamber 21, the second through-chamber 21 communicates with the S capillary 64, and the sub-valve body portion 30 has a third through-chamber 33; the sliding part 50 penetrates through the first circulation cavity 13, the second circulation cavity 21 and the third circulation cavity 33, a circulation channel 511 is arranged in the sliding part 50, and a D-C circulation hole 512 and a D-E circulation hole 513 are arranged on the side wall of the sliding part 50 at intervals, wherein the D-C circulation hole 512 is communicated with the first circulation cavity 13 and the circulation channel 511, the D-E circulation hole 513 is communicated with the third circulation cavity 33 and the circulation channel 511, and the D capillary 62 is communicated with the first circulation cavity 13; wherein, when the slide portion 50 is in the cooling position, the C capillary 61 is in communication with the first flow-through chamber 13, the C capillary 61 is disconnected from the second flow-through chamber 21, the E capillary 63 is in communication with the second flow-through chamber 21, and the E capillary 63 is disconnected from the third flow-through chamber 33; when the slider 50 is in the heating position, the C capillary 61 and the first flow chamber 13 are disconnected, the C capillary 61 and the second flow chamber 21 are connected, the E capillary 63 and the second flow chamber 21 are disconnected, and the E capillary 63 and the third flow chamber 33 are connected.

With the above arrangement, when the sliding portion 50 is in the cooling position, the fluid enters from the D capillary 62, and since the C capillary 61 is in communication with the first circulation chamber 13 and the C capillary 61 is disconnected from the second circulation chamber 21, the fluid can smoothly flow out from the C capillary 61 without entering the second circulation chamber 21; at this time, the E capillary 63 and the second circulation chamber 21 are communicated, and the E capillary 63 and the third circulation chamber 33 are disconnected, so that the fluid does not enter the E capillary 63 through the third circulation chamber 33, thereby implementing a cooling state.

When the sliding part 50 is in the heating position, the fluid enters from the D capillary 62 and flows out from the third flow-through chamber 33 through the sliding part 50, and the E capillary 63 and the third flow-through chamber 33 are communicated and the E capillary 63 and the second flow-through chamber 21 are disconnected, so that the fluid can smoothly flow out from the E capillary 63; at this time, the C capillary tube 61 and the first circulation chamber 13 are disconnected, and the C capillary tube 61 and the second circulation chamber 21 are communicated, thereby implementing a heating state.

Wherein the single valve port 12 has a first flow-through chamber 13 and the end cap 32 has a third flow-through chamber 33.

Further, the first flow-through chamber 13 has a first port 131 at one end facing the middle valve body 20, the second flow-through chamber 21 has a second port 211 and a third port 212 at two ends, respectively, the second port 211 is located between the third port 212 and the first port 131, and the third flow-through chamber 33 has a fourth port 331 at one end facing the middle valve body 20; the sliding part 50 comprises a valve rod 51, a first sealing ring 52, a second sealing ring 53, a third sealing ring 54 and a fourth sealing ring 55 which are arranged on the valve rod 51 in sequence, the valve rod 51 is connected with the core iron 40, and the valve rod 51 is provided with a circulation passage 511, a D-C circulation hole 512 and a D-E circulation hole 513; when the sliding portion 50 is in the cooling position, the first seal ring 52 is retracted from the first valve port 131, the second seal ring 53 blocks the second valve port 211, the third seal ring 54 is retracted from the third valve port 212, and the fourth seal ring 55 blocks the fourth valve port 331; when the sliding portion 50 is in the heating position, the first seal 52 blocks the first port 131, the second seal 53 moves out of the second port 211, the third seal 54 blocks the third port 212, and the fourth seal 55 moves out of the fourth port 331. By arranging the first valve port 131, the second valve port 211, the third valve port 212 and the fourth valve port 331, the fluid flow is increased, and meanwhile, the first sealing ring 52, the second sealing ring 53, the third sealing ring 54 and the fourth sealing ring 55 are convenient to seal, so that the sealing effect is improved. The flow passage 511, the D-C flow holes 512 and the D-E flow holes 513 are provided to facilitate smooth outflow of the fluid. Moreover, the flow rate of the pilot valve can be adjusted by adjusting the opening angle and the opening size of the first valve port 131, the second valve port 211, the third valve port 212 or the fourth valve port 331, so that the applicability is wide and the manufacturing cost is low.

In the present embodiment, the flow area of the D capillary 62 is S1, the flow area between the first flow-through chamber 13 and the valve stem 51 is S2, the flow areas of the C capillary 61, the S capillary 64, and the E capillary 63 are all S4, the flow area of the D-C flow hole 512 is S5, the flow area of the D-E flow hole 513 is S6, the flow area between the third flow-through chamber 33 and the valve stem 51 is S7, the flow area of the flow-through passage 511 is S8, and the flow area between the second flow-through chamber 21 and the valve stem 51 is S9; when the slide portion 50 is in the cooling position, the flow area between the first seal 52 and the first port 131 is S3, and the flow area between the third seal 54 and the third port 212 is S10; when the slide portion 50 is in the heating position, the flow area between the fourth seal 55 and the fourth valve port 331 is S11, and the flow area between the second seal 53 and the second valve port 211 is S10; wherein S8 is more than or equal to S5, more than or equal to S2, more than or equal to S3, more than or equal to S1, more than or equal to S4, and/or S8 is more than or equal to S6, more than or equal to S7, more than or equal to S11, more than or equal to S1, more than or equal to S4, and/or S9 is more than or equal to S10.

Through the arrangement, when the sliding part 50 is at the cooling position or the heating position, the flow area of each part is limited within the range, so that no throttling point exists in the process of flowing the fluid entering from the D capillary tube 62, the backflow problem is avoided, the flow rate of the pilot valve is improved, and the stability and the reliability of the pilot valve during operation are improved.

The D-C circulation hole 512 is provided with a plurality of C sub-holes which are distributed along the circumferential direction of the valve rod 51, and two ends of each C sub-hole are respectively communicated with the circulation channel 511 and the first circulation cavity 13; the D-E flow hole 513 has a plurality of E sub holes distributed along the circumferential direction of the valve rod 51, and both ends of each E sub hole are respectively communicated with the flow passage 511 and the third flow chamber 33. The plurality of C sub-holes are arranged and distributed along the circumferential direction of the valve rod 51, so that the flow of the fluid flowing out can be effectively increased; the plurality of E sub-holes are arranged and distributed along the circumferential direction of the valve rod 51, so that the flow of the fluid flowing out can be effectively increased. Further, the above arrangement can avoid the strength of the valve rod 51 from being reduced by the opening.

In this embodiment, the valve rod 51 includes a rod body 514 and a first blocking ring 5151, a second blocking ring 5152, a third blocking ring 5153, a fourth blocking ring 5154, a fifth blocking ring 5155 and a sixth blocking ring 5156 sequentially disposed on the rod body 514, the first sealing ring 52 is located between the first blocking ring 5151 and the second blocking ring 5152, the second sealing ring 53 is located between the second blocking ring 5152 and the third blocking ring 5153, the third sealing ring 54 is located between the fourth blocking ring 5154 and the fifth blocking ring 5155, and the fourth sealing ring 55 is located between the fifth blocking ring 5155 and the sixth blocking ring 5156. The first retaining ring 5151, the second retaining ring 5152, the third retaining ring 5153, the fourth retaining ring 5154, the fifth retaining ring 5155 and the sixth retaining ring 5156 are arranged, so that the first sealing ring 52, the second sealing ring 53, the third sealing ring 54 and the fourth sealing ring 55 can be conveniently installed and fixed.

Further, the first valve port 131, the second valve port 211, the third valve port 212 and the fourth valve port 331 are all tapered ports with the same size, the first retainer ring 5151, the third retainer ring 5153, the fourth retainer ring 5154 and the sixth retainer ring 5156 have the same size, and the second retainer ring 5152 and the fifth retainer ring 5155 have the same size, wherein the outer diameter of the first retainer ring 5151 is smaller than the outer diameter of the second retainer ring 5152, and the outer diameter of the second retainer ring 5152 is smaller than or equal to the inner diameter of the first valve port 131; the first seal ring 52, the second seal ring 53, the third seal ring 54, and the fourth seal ring 55 have the same size, and the outer diameter of the first seal ring 52 is larger than the outer diameter of the second retainer ring 5152. By adopting the arrangement mode, the outer diameter of the first retaining ring 5151 is set to be smaller than the outer diameter of the second retaining ring 5152, and the outer diameter of the second retaining ring 5152 is set to be smaller than or equal to the inner diameter of the first valve port 131, so that the limit of the sealing ring is ensured, the influence on fluid flow can be reduced, the smooth flow passage can be ensured, and the resistance is reduced.

In the present embodiment, the sliding portion 50 includes a valve stem 51, the valve stem 51 has a flow passage 511, one end of the valve stem 51 has an external thread, an outer wall of the valve stem 51 has a hexagonal mating face, and both ends of the core iron 40 have an internal thread and a hexagonal counterbore 41, respectively, which mate. The external thread is arranged for being in threaded fit with the core iron 40, and the installation and the disassembly are convenient by adopting a threaded fit mode; the hexagonal matching surface and the hexagonal counter bore 41 are arranged, so that the installation and the disassembly of operators are facilitated. A hexagonal wrench can be inserted into the hexagonal counterbore 41, so that the circumferential position of the core iron 40 is limited, a hexagonal sleeve can be sleeved on the hexagonal matching surface, and the screwing operation can be performed through the sleeve.

The valve rod 51 is further provided with a first balance hole 516, the first balance hole 516 is communicated with the flow passage 511, the core iron 40 is further provided with a second balance hole 42, and two ends of the second balance hole 42 are respectively communicated with the hexagonal counter bore 41 and the first balance hole 516. By providing the first balance hole 516 in communication with the communication passage 511, it is possible to balance the pressure difference inside the valve stem 51 during the reciprocating movement of the valve stem 51. In the present embodiment, the inner diameter of the flow passage 511 is equal to or larger than the inner diameters of the first and second balance holes 516 and 42.

As shown in fig. 1, the main valve body 10 further includes an attractor 14 and an elastic member 15, the attractor 14 is disposed in the main valve body 11, and the elastic member 15 is located between the attractor 14 and the core iron 40; the slide portion 50 is in the cooling position when the core 40 abuts against the support ring 16, and the slide portion 50 is in the heating position when the core 40 abuts against the attractor 14. By providing the attractor 14 and the elastic member 15, the movement of the core iron 40 is attracted to move the slide 50 to the cooling position or the heating position.

In this embodiment, the outer wall of the single valve port 12 has a first welding ring groove 121, and the outer wall of the single valve port 12 is welded to the inner wall of the main valve body 11; the outer wall of the end cover 32 is provided with a second welding ring groove 321, and the outer wall of the end cover 32 is welded with the inner wall of the auxiliary valve body 31; the outer wall of the support ring 16 is provided with a third welding ring groove 161, and the outer wall of the support ring 16 is welded with the inner wall of the main valve body 11; the middle valve body 20 has a first annular step and a second annular step at its two ends, the main valve body 11 is welded to the first annular step, and the sub valve body 31 is welded to the second annular step. The first, second and third soldering ring grooves 121, 321, 161 are provided for accommodating solder for subsequent soldering; the first annular step and the second annular step are arranged, so that the main valve body 11, the auxiliary valve body 31 and the middle valve body 20 can be welded conveniently.

As shown in fig. 14, according to another aspect of the present invention, there is provided a four-way valve comprising a main valve and a pilot valve as described above. By adopting the scheme, the C capillary tube 61 and the D capillary tube 62 are arranged to be connected with the main valve body part, the S capillary tube 64 is arranged to be connected with the middle valve body part, and the E capillary tube 63 is arranged to be connected with the auxiliary valve body part 30; and then the operating mode switching efficiency of the four-way valve is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. A pilot valve, comprising:

a main valve body part (10), a middle valve body (20) and an auxiliary valve body part (30) which are sequentially connected in a sealing way;

a core (40) disposed in the main valve body (10) so as to be movable back and forth;

a sliding part (50) inserted into the main valve body (10), the middle valve body (20), and the sub valve body (30), the sliding part (50) being connected to the core iron (40) so as to move with the core iron (40);

a C capillary tube (61), a D capillary tube (62), an E capillary tube (63) and an S capillary tube (64), wherein the C capillary tube (61) and the D capillary tube (62) are connected with the main valve body part (10), the S capillary tube (64) is connected with the middle valve body (20), and the E capillary tube (63) is connected with the auxiliary valve body part (30);

wherein the sliding part (50) has a cooling position and a heating position, and when the sliding part (50) is in the cooling position, the D capillary tube (62) and the C capillary tube (61) are communicated, and the S capillary tube (64) and the E capillary tube (63) are communicated; when the slide section (50) is in the heating position, the D capillary (62) and the E capillary (63) communicate with each other, and the S capillary (64) and the C capillary (61) communicate with each other.

2. The pilot valve as defined in claim 1, wherein the main valve body (10) comprises a main valve body (11) and a single valve body (12), the core (40) and the single valve body (12) are both disposed in the main valve body (11), the C capillary (61) is located on a side of the single valve body (12) facing the middle valve body (20), the D capillary (62) is located on a side of the single valve body (12) facing the core (40), the auxiliary valve body (30) comprises an auxiliary valve body (31) and an end cap (32) connected to each other, and two ends of the middle valve body (20) are respectively connected to the main valve body (11) and the auxiliary valve body (31).

3. Pilot valve according to claim 2, characterized in that the C capillary tube (61) and the D capillary tube (62) are each connected with the main valve body (11), the capillary tube E (63) is connected with the auxiliary valve body (31), the capillary tube C (61), the capillary tube D (62), the capillary tube S (64) and the capillary tube E (63) are arranged in parallel, the C capillary (61), the S capillary (64), and the E capillary (63) are all located on the same side of the slide section (50), the D capillary (62) is positioned on the side of the sliding part (50) facing away from the C capillary (61), the axes of the C capillary (61), the S capillary (64), the E capillary (63), the D capillary (62), and the sliding section (50) are all located on the same plane.

4. The pilot valve as defined in claim 2, wherein the main valve body (11) has a first flanging opening (111), a third flanging opening (112), one end of the C capillary tube (61) penetrates into the first flanging opening (111) and is welded with the inner wall of the first flanging opening (111), and one end of the D capillary tube (62) penetrates into the third flanging opening (112) and is welded with the inner wall of the third flanging opening (112); the auxiliary valve body (31) is provided with a second flanging opening (311), and one end of the E capillary (63) penetrates into the second flanging opening (311) and is welded with the inner wall of the second flanging opening (311); the side wall of the middle valve body (20) is provided with an S mounting hole, one end of the S capillary tube (64) penetrates into the S mounting hole and is welded, and the end face of the S capillary tube (64) is abutted to a stop face in the S mounting hole.

5. The pilot valve of claim 2, wherein the main valve body (10) further comprises a support ring (16) disposed within the main valve body (11), the support ring (16) and the single port (12) being spaced apart, the D capillary (62) being located between the single port (12) and the support ring (16).

6. The pilot valve of claim 1,

the main valve body (10) having a first flow-through chamber (13), the middle valve body (20) having a second flow-through chamber (21), the second flow-through chamber (21) communicating with the S capillary (64), the sub valve body (30) having a third flow-through chamber (33);

the sliding part (50) penetrates through the first circulation cavity (13), the second circulation cavity (21) and the third circulation cavity (33), a circulation channel (511) is arranged in the sliding part (50), and D-C circulation holes (512) and D-E circulation holes (513) are arranged on the side wall of the sliding part (50) at intervals, wherein the D-C circulation holes (512) are used for communicating the first circulation cavity (13) with the circulation channel (511), the D-E circulation holes (513) are used for communicating the third circulation cavity (33) with the circulation channel (511), and the D capillary (62) is communicated with the first circulation cavity (13);

wherein, with the slider (50) in the cooling position, the C capillary (61) and the first circulation chamber (13) are in communication, the C capillary (61) and the second circulation chamber (21) are disconnected, the E capillary (63) and the second circulation chamber (21) are in communication, and the E capillary (63) and the third circulation chamber (33) are disconnected; when the slide portion (50) is in the heating position, the C capillary (61) and the first circulation chamber (13) are disconnected, the C capillary (61) and the second circulation chamber (21) are communicated, the E capillary (63) and the second circulation chamber (21) are disconnected, and the E capillary (63) and the third circulation chamber (33) are communicated.

7. The pilot valve of claim 6,

the first circulation cavity (13) is provided with a first valve port (131) at one end facing the middle valve body (20), the second circulation cavity (21) is provided with a second valve port (211) and a third valve port (212) at two ends respectively, the second valve port (211) is positioned between the third valve port (212) and the first valve port (131), and the third circulation cavity (33) is provided with a fourth valve port (331) at one end facing the middle valve body (20);

the sliding part (50) comprises a valve rod (51), and a first sealing ring (52), a second sealing ring (53), a third sealing ring (54) and a fourth sealing ring (55) which are sequentially arranged on the valve rod (51), the valve rod (51) is connected with the core iron (40), and the valve rod (51) is provided with the circulation passage (511), the D-C circulation hole (512) and the D-E circulation hole (513);

wherein, when the sliding portion (50) is in the cooling position, the first seal ring (52) is configured to avoid the first valve port (131), the second seal ring (53) is configured to block the second valve port (211), the third seal ring (54) is configured to avoid the third valve port (212), and the fourth seal ring (55) is configured to block the fourth valve port (331); when the sliding portion (50) is in the heating position, the first seal ring (52) blocks the first valve port (131), the second seal ring (53) is retracted from the second valve port (211), the third seal ring (54) blocks the third valve port (212), and the fourth seal ring (55) is retracted from the fourth valve port (331).

8. The pilot valve of claim 7,

the flow area of the D capillary (62) is S1, the flow area between the first flow-through cavity (13) and the valve rod (51) is S2, the flow areas of the C capillary (61), the S capillary (64) and the E capillary (63) are S4, the flow area of the D-C flow hole (512) is S5, the flow area of the D-E flow hole (513) is S6, the flow area between the third flow-through cavity (33) and the valve rod (51) is S7, the flow area of the flow channel (511) is S8, and the flow area between the second flow-through cavity (21) and the valve rod (51) is S9;

when the slide portion (50) is in the cooling position, a flow area between the first seal ring (52) and the first port (131) is S3, and a flow area between the third seal ring (54) and the third port (212) is S10;

when the sliding portion (50) is in the heating position, a flow area between the fourth seal ring (55) and the fourth valve port (331) is S11, and a flow area between the second seal ring (53) and the second valve port (211) is S10;

wherein S8 is more than or equal to S5, more than or equal to S2, more than or equal to S3, more than or equal to S1, more than or equal to S4, and/or S8 is more than or equal to S6, more than or equal to S7, more than or equal to S11, more than or equal to S1, more than or equal to S4, and/or S9 is more than or equal to S10.

9. The pilot valve of claim 7, wherein the D-C flow hole (512) has a plurality of C sub-holes distributed along the circumference of the valve stem (51), and both ends of each C sub-hole are respectively communicated with the flow passage (511) and the first flow cavity (13); the D-E flow hole (513) is provided with a plurality of E sub-holes which are distributed along the circumferential direction of the valve rod (51), and two ends of each E sub-hole are respectively communicated with the flow passage (511) and the third flow cavity (33).

10. The pilot valve of claim 7, wherein the valve stem (51) comprises a stem body (514) and a first baffle ring (5151), a second baffle ring (5152), a third baffle ring (5153), a fourth baffle ring (5154), a fifth baffle ring (5155) and a sixth baffle ring (5156) which are arranged on the stem body (514) in sequence, the first sealing ring (52) is positioned between the first baffle ring (5151) and the second baffle ring (5152), the second sealing ring (53) is positioned between the second baffle ring (5152) and the third baffle ring (5153), the third sealing ring (54) is positioned between the fourth baffle ring (5154) and the fifth baffle ring (5155), and the fourth sealing ring (55) is positioned between the fifth baffle ring (5155) and the sixth baffle ring (5156).

11. The pilot valve as defined in claim 10, wherein the first valve port (131), the second valve port (211), the third valve port (212) and the fourth valve port (331) are all tapered ports with the same size, the first retainer ring (5151), the third retainer ring (5153), the fourth retainer ring (5154) and the sixth retainer ring (5156) are with the same size, and the second retainer ring (5152) and the fifth retainer ring (5155) are with the same size, wherein the outer diameter of the first retainer ring (5151) is smaller than the outer diameter of the second retainer ring (5152), and the outer diameter of the second retainer ring (5152) is smaller than or equal to the inner diameter of the first valve port (131); the first sealing ring (52), the second sealing ring (53), the third sealing ring (54) and the fourth sealing ring (55) are the same in size, and the outer diameter of the first sealing ring (52) is larger than that of the second retaining ring (5152).

12. The pilot valve as defined in claim 6, wherein the sliding portion (50) comprises a valve stem (51), the valve stem (51) having the flow passage (511), one end of the valve stem (51) having an external thread, an outer wall of the valve stem (51) having a hexagonal mating face, both ends of the core iron (40) having an internal thread and a hexagonal counterbore (41), respectively, the internal thread and the external thread mating.

13. The pilot valve as defined in claim 12, wherein said valve stem (51) further has a first balance hole (516), said first balance hole (516) communicating with said flow passage (511), said core iron (40) further has a second balance hole (42), both ends of said second balance hole (42) communicating with said hexagonal counterbore (41) and said first balance hole (516), respectively.

14. The pilot valve of claim 5, wherein the main valve body (10) further comprises an attractor (14) and an elastic member (15), the attractor (14) being disposed within the main valve body (11), the elastic member (15) being located between the attractor (14) and the core iron (40); wherein the sliding portion (50) is in the cooling position when the core iron (40) and the support ring (16) are in abutment, and the sliding portion (50) is in the heating position when the core iron (40) and the attractor (14) are in abutment.

15. The pilot valve of claim 5, wherein the outer wall of the single valve port (12) has a first weld ring groove (121), the outer wall of the single valve port (12) and the inner wall of the main valve body (11) being welded; the outer wall of the end cover (32) is provided with a second welding ring groove (321), and the outer wall of the end cover (32) is welded with the inner wall of the auxiliary valve body (31); the outer wall of the support ring (16) is provided with a third welding ring groove (161), and the outer wall of the support ring (16) is welded with the inner wall of the main valve body (11); the two ends of the middle valve body (20) are respectively provided with a first annular step and a second annular step, the main valve body (11) is welded with the first annular step, and the auxiliary valve body (31) is welded with the second annular step.

16. A four-way valve comprising a main valve and a pilot valve as claimed in any one of claims 1 to 15.

Images