Pilot valve and four-way valve

Abstract

The application provides a pilot valve and a four-way valve, which comprise a main valve body part, a middle valve body and a secondary valve body part which are sequentially and sealingly connected; a core iron which is movably arranged in the main valve body part; a sliding part which is arranged in the main valve body part, the middle valve body and the secondary valve body part, and is connected with the core iron to move with the core iron; C capillary tubes, D capillary tubes, E capillary tubes and S capillary tubes, wherein the C capillary tubes and the D capillary tubes are connected with the main valve body part, the S capillary tubes are connected with the middle valve body, and the E capillary tubes are connected with the secondary valve body part; wherein the sliding part has a refrigeration position and a heating position, when the sliding part is in the refrigeration position, the D capillary tubes and the C capillary tubes are communicated, and the S capillary tubes and the E capillary tubes are communicated; when the sliding part is in the heating position, the D capillary tubes and the E capillary tubes are communicated, and the S capillary tubes and the C capillary tubes are communicated. Through the technical scheme, the problem of small flow in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of four-way valve technology, and more specifically, to a pilot valve and a four-way valve. Background Technology

[0002] Currently, a four-way valve consists of a pilot valve, a valve seat, and a main valve. The pilot valve controls the operating mode of the main valve. In existing technology, the pilot valve of the four-way valve has insufficient flow, resulting in slow switching of the four-way valve (during the switching process, the internal volume of the main valve increases, and the refrigerant flows in from the pilot valve capillary tube, filling the piston chambers on both sides too slowly, causing the slider to move slowly, resulting in slow switching of the four-way valve, and ultimately causing gurgling noise); furthermore, the fluid enters the pilot valve chamber from the D capillary tube, mainly because the E, S, and C capillary holes of the pilot valve seat are small, resulting in low flow. Summary of the Invention

[0003] This invention provides a pilot valve and a four-way valve to solve the problem of low flow rate in pilot valves in the prior art.

[0004] To address the aforementioned problems, according to one aspect of the present invention, a pilot valve is provided, comprising: a main valve body, a middle valve body, and a secondary valve body connected in a sealed manner in sequence; a core iron, movably disposed within the main valve body; a sliding part, passing through the main valve body, the middle valve body, and the secondary valve body, the sliding part being connected to the core iron to move with the core iron; and capillary tubes C, D, E, and S, wherein capillary tubes C and D are connected to the main valve body, capillary tube S is connected to the middle valve body, and capillary tube E is connected to the secondary valve body; wherein the sliding part has a cooling position and a heating position; when the sliding part is in the cooling position, capillary tubes D and C are connected, and capillary tubes S and E are connected; when the sliding part is in the heating position, capillary tubes D and E are connected, and capillary tubes S and C are connected.

[0005] Furthermore, the main valve body includes a main valve body and a single valve port component. Both the core iron and the single valve port component are disposed within the main valve body. The C capillary tube is located on the side of the single valve port component facing the middle valve body, and the D capillary tube is located on the side of the single valve port component facing the core iron. The secondary valve body includes a secondary valve body and an end cap that are interconnected. Both ends of the middle valve body are connected to the main valve body and the secondary valve body, respectively.

[0006] Furthermore, capillary tubes C and D are both connected to the main valve body, and capillary tube E is connected to the secondary valve body. Capillary tubes C, D, S, and E are arranged in parallel, and are all located on the same side of the sliding part. Capillary tube D is located on the side of the sliding part away from capillary tube C. The axes of capillary tubes C, S, E, D, and the sliding part are all located on the same plane.

[0007] Furthermore, the main valve body has a first flange and a third flange. One end of the C capillary tube is inserted into the first flange and welded to the inner wall of the first flange. One end of the D capillary tube is inserted into the third flange and welded to the inner wall of the third flange. The auxiliary valve body has a second flange. One end of the E capillary tube is inserted into the second flange and welded to the inner wall of the second flange. The side wall of the middle valve body has an S mounting hole. One end of the S capillary tube is inserted into the S mounting hole and welded. The end face of the S capillary tube abuts against the stop surface inside the S mounting hole.

[0008] Furthermore, the main valve body also includes a support ring disposed within the main valve body, with the support ring and the single valve port being spaced apart, and the D capillary tube located between the single valve port and the support ring.

[0009] Furthermore, the main valve body has a first flow chamber, the middle valve body has a second flow chamber, the second flow chamber is connected to the S capillary tube, and the auxiliary valve body has a third flow chamber; the sliding part passes through the first flow chamber, the second flow chamber, and the third flow chamber, and has a flow channel inside the sliding part. The side wall of the sliding part has DC flow holes and DE flow holes spaced apart, wherein the DC flow hole connects the first flow chamber and the flow channel, the DE flow hole connects the third flow chamber and the flow channel, and the D capillary tube is connected to the first flow chamber; wherein, when the sliding part is in the cooling position, the C capillary tube is connected to the first flow chamber and disconnected from the second flow chamber, the E capillary tube is connected to the second flow chamber and disconnected from the third flow chamber; when the sliding part is in the heating position, the C capillary tube is disconnected from the first flow chamber and connected to the second flow chamber, the E capillary tube is disconnected from the second flow chamber and connected to the third flow chamber.

[0010] Furthermore, the first flow chamber has a first valve port at one end facing the central valve body, the second flow chamber has a second valve port and a third valve port at both ends respectively, and the second valve port is located between the third valve port and the first valve port. The third flow chamber has a fourth valve port at one end facing the central valve body. The sliding part includes a valve stem and a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring arranged sequentially on the valve stem. The valve stem is connected to the core iron, and the valve stem has a flow channel, a DC flow hole and a DE flow hole. When the sliding part is in the cooling 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. When 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.

[0011] Further, the flow area of ​​capillary D is S1, the flow area between the first flow chamber and the valve stem is S2, the flow areas of capillary C, capillary S, and capillary E are all S4, the flow area of ​​flow hole DC is S5, the flow area of ​​flow hole DE is S6, the flow area between the third flow chamber and the valve stem is S7, the flow area of ​​flow channel is S8, and the flow area between the second flow chamber and the valve stem is S9; when the sliding part is in the cooling position, the flow area between the first sealing ring and the first valve port is S3, and the flow area between the third sealing 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≥S5≥S2≥S3≥S1≥S4, and / or S8≥S6≥S7≥S11≥S1≥S4, and / or S9≥S10.

[0012] Furthermore, the DC flow hole has multiple C sub-holes distributed along the circumference of the valve stem, and each C sub-hole is connected to the flow channel and the first flow cavity at both ends, respectively; the DE flow hole has multiple E sub-holes distributed along the circumference of the valve stem, and each E sub-hole is connected to the flow channel and the third flow cavity at both ends, respectively.

[0013] Furthermore, the valve stem includes a stem 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 sequentially disposed on the stem body. The first sealing ring is located between the first and second retaining rings, the second sealing ring is located between the second and third retaining rings, the third sealing ring is located between the fourth and fifth retaining rings, and the fourth sealing ring is located between the fifth and sixth retaining rings.

[0014] Furthermore, the first valve port, the second valve port, the third valve port, and the fourth valve port are all tapered ports of the same size. The first retaining ring, the third retaining ring, the fourth retaining ring, and the sixth retaining ring are of the same size. The second retaining ring and the fifth retaining ring are of the same size. The outer diameter of the first retaining ring is smaller than the outer diameter of the second retaining ring, and the outer diameter of the second retaining ring is less 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 of the same size. The outer diameter of the first sealing ring is larger than the outer diameter of the second retaining ring.

[0015] Furthermore, the sliding part includes a valve stem with a flow channel, one end of the valve stem has an external thread, the outer wall of the valve stem has a hexagonal mating surface, and both ends of the core iron have internal threads and hexagonal countersunk holes, with the internal threads and external threads mating.

[0016] Furthermore, the valve stem also has a first balance hole, which is connected to the flow channel, and the core iron also has a second balance hole, the two ends of which are connected to the hexagonal countersunk hole and the first balance hole, respectively.

[0017] Furthermore, the main valve body also includes an attractor and an elastic element. The attractor is disposed within the main valve body, and the elastic element is located between the attractor and the core iron. When the core iron and the support ring are in contact, the sliding part is in the cooling position, and when the core iron and the attractor are in contact, the sliding part is in the heating position.

[0018] Furthermore, the outer wall of the single valve port has a first welded ring groove, and the outer wall of the single valve port is welded to the inner wall of the main valve body; the outer wall of the end cap has a second welded ring groove, and the outer wall of the end cap is welded to the inner wall of the auxiliary valve body; the outer wall of the support ring has a third welded ring groove, and the outer wall of the support ring is welded to the inner wall of the main valve body; the two ends of the middle valve body have a first annular step and a second annular step, respectively, the main valve body is welded to the first annular step, and the auxiliary valve body is welded to the second annular step.

[0019] According to another aspect of the present invention, a four-way valve is provided, the four-way valve comprising a main valve and the aforementioned pilot valve.

[0020] The present invention provides a pilot valve comprising: a main valve body, a middle valve body, and a secondary valve body connected in a sealed manner in sequence; a core iron, which is reciprocally movably disposed within the main valve body; a sliding part, which passes through the main valve body, the middle valve body, and the secondary valve body, and is connected to the core iron to move with the core iron; and capillary tubes C, D, E, and S, wherein capillary tubes C and D are connected to the main valve body, capillary tube S is connected to the middle valve body, and capillary tube E is connected to the secondary valve body; wherein the sliding part has a cooling position and a heating position; when the sliding part is in the cooling position, capillary tubes D and C are connected, and capillary tubes S and E are connected; when the sliding part is in the heating position, capillary tubes D and E are connected, and capillary tubes S and C are connected. This design connects capillary tubes C and D to the main valve body, capillary tube S to the intermediate valve body, and capillary tube E to the auxiliary valve body. This eliminates the need for a pilot valve seat connecting capillary tubes C, E, and S. The orifice size can be adjusted based on the diameters of capillary tubes C, D, E, and S, thereby increasing the pilot valve flow rate. Furthermore, the design incorporates a core and a sliding part, allowing the sliding part to move with the core, thus enabling position switching. Compared to existing technologies, this design eliminates the need to modify costly structures such as the core and increases the pilot valve flow rate without altering the core's stroke. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 An exploded view of the pilot valve provided in an embodiment of the present invention is shown;

[0023] Figure 2 It shows Figure 1 Cross-sectional view of the pilot valve;

[0024] Figure 3 It shows Figure 1 Cross-sectional view of the pilot valve in cooling mode;

[0025] Figure 4 It shows Figure 1 Cross-sectional view of the central pilot valve in heating mode;

[0026] Figure 5 It shows Figure 1 Structural diagram of the valve stem;

[0027] Figure 6 It shows Figure 5 A sectional view of the valve stem;

[0028] Figure 7 It shows Figure 1 Cross-sectional view of the core iron;

[0029] Figure 8 It shows Figure 1 A sectional view of the valve body in the middle;

[0030] Figure 9 It shows Figure 1 Structural diagram of the main valve body;

[0031] Figure 10 It shows Figure 1 Structural diagram of the intermediate and auxiliary valve bodies;

[0032] Figure 11 It shows Figure 1 A cross-sectional view of a single valve port component;

[0033] Figure 12 It shows Figure 1 Cross-sectional view of the central support ring;

[0034] Figure 13 It shows Figure 1 Cross-sectional view of the middle end cap;

[0035] Figure 14 A structural diagram of a four-way valve provided in another embodiment of the present invention is shown.

[0036] The above figures include the following reference numerals:

[0037] 10. Main valve body; 11. Main valve body; 111. First flange; 112. Third flange; 12. Single valve port component; 121. First welded ring groove; 13. First flow chamber; 131. First valve port; 14. Suction element; 15. Elastic element; 16. Support ring; 161. Third welded ring groove;

[0038] 20. Middle valve body; 21. Second flow chamber; 211. Second valve port; 212. Third valve port;

[0039] 30. Secondary valve body; 31. Secondary valve body; 311. Second flange; 32. End cap; 321. Second welded ring groove; 33. Third flow chamber; 331. Fourth valve port;

[0040] 40. Core iron; 41. Hexagonal countersunk hole; 42. Second balancing hole;

[0041] 50. Sliding part; 51. Valve stem; 511. Flow channel; 512. DC flow hole; 513. DE flow hole; 514. Rod body; 5151. First retaining ring; 5152. Second retaining ring; 5153. Third retaining ring; 5154. Fourth retaining ring; 5155. Fifth retaining ring; 5156. Sixth retaining ring; 516. First balance hole; 52. First sealing ring; 53. Second sealing ring; 54. Third sealing ring; 55. Fourth sealing ring;

[0042] 61. C capillary; 62. D capillary; 63. E capillary; 64. S capillary. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] like Figures 1 to 13As shown, an embodiment of the present invention provides a pilot valve, comprising: a main valve body 10, a middle valve body 20, and a secondary valve body 30 sequentially and sealingly connected; a core iron 40, which is reciprocally movably disposed within the main valve body 10; a sliding part 50, which passes through the main valve body 10, the middle valve body 20, and the secondary valve body 30, and is connected to the core iron 40 to move with the core iron 40; and capillary tubes C 61, D 62, E 63, and S 64, wherein capillary tubes C 61 and D 64... All 62 are connected to the main valve body 10, the S capillary tube 64 is connected to the middle valve body 20, and the E capillary tube 63 is connected to the auxiliary valve body 30. The sliding part 50 has a cooling position and a heating position. When the sliding part 50 is in the cooling position, the D capillary tube 62 and the C capillary tube 61 are connected, and the S capillary tube 64 and the E capillary tube 63 are connected. When the sliding part 50 is in the heating position, the D capillary tube 62 and the E capillary tube 63 are connected, and the S capillary tube 64 and the C capillary tube 61 are connected.

[0045] In this design, capillary tubes C 61 and D 62 are connected to the main valve body, capillary tube S 64 is connected to the intermediate valve body, and capillary tube E 63 is connected to the auxiliary valve body 30. This eliminates the need for a pilot valve seat connected to capillary tubes C 61, E 63, and S 64. This allows the orifice size to be adjusted based on the diameters of capillary tubes C 61, D 62, E 63, and S 64, thereby increasing the pilot valve flow rate. Furthermore, the core iron 40 and sliding part 50 are included, allowing the sliding part 50 to move with the core iron 40, thus enabling position switching. Compared to existing technologies, this design eliminates the need to modify the costly core iron 40 and other structural components, and increases the pilot valve flow rate without altering the stroke of the core iron 40.

[0046] The main valve body 10 includes a main valve body 11 and a single valve port 12. Both the core iron 40 and the single valve port 12 are housed within the main valve body 11. The C-capillary tube 61 is located on the side of the single valve port 12 facing the middle valve body 20, and the D-capillary tube 62 is located on the side of the single valve port 12 facing the core iron 40. The secondary valve body 30 includes a secondary valve body 31 and an end cap 32 connected to each other. Both ends of the middle valve body 20 are connected to the main valve body 11 and the secondary valve body 31, respectively. The single valve port 12 facilitates communication between the sliding part 50 and the C-capillary tube 61. The end cap 32 seals one end of the secondary valve body 30, while the other end connects to the middle valve body 20. Welding can be used for this connection, ensuring stability and reliability.

[0047] Furthermore, capillary tubes C 61 and D 62 are both connected to the main valve body 11, and capillary tube E 63 is connected to the secondary valve body 31. Capillary tubes C 61, D 62, S 64, and E 63 are arranged in parallel, all located on the same side of the sliding part 50. Capillary tube D 62 is located on the side of the sliding part 50 opposite to capillary tube C 61. The axes of capillary tubes C 61, S 64, E 63, D 62, and the sliding part 50 are all located on the same plane. Through this arrangement, capillary tube D 62 is connected to the main valve body 11, allowing fluid entering through capillary tube D 62 to directly enter the main valve body 11. The orifice size can be adjusted according to the diameter of capillary tube D 62, increasing the flow rate of fluid entering the main valve body 11.

[0048] In this embodiment, the main valve body 11 has a first flange 111 and a third flange 112. One end of the C capillary 61 is inserted into the first flange 111 and welded to the inner wall of the first flange 111. One end of the D capillary 62 is inserted into the third flange 112 and welded to the inner wall of the third flange 112. The secondary valve body 31 has a second flange 311. One end of the E capillary 63 is inserted into the second flange 311 and welded to the inner wall of the second flange 311. The side wall of the middle valve body 20 has an S mounting hole. One end of the S capillary 64 is inserted into the S mounting hole and welded. The end face of the S capillary 64 abuts against the stop surface in the S mounting hole.

[0049] By setting the first flange 111, the welding area with one end of capillary C 61 can be increased during welding, thus improving the welding quality. By setting the third flange 112, the welding area with one end of capillary D 62 can be increased during welding, thus improving the welding quality. By setting the second flange 311, the welding area with one end of capillary E 63 can be increased during welding, thus improving the welding quality. By setting the S mounting hole, the welding area with one end of capillary S 64 can be increased during welding, thus improving the welding quality. Furthermore, by abutting the end face of capillary S 64 with the stop surface inside the S mounting hole, the insertion depth of capillary S 64 can be limited, preventing capillary S 64 from being inserted too deeply and affecting fluid flow.

[0050] 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 port 12 are spaced apart, and the D-capillary tube 62 is located between the single valve port 12 and the support ring 16. By providing the support ring 16 within the main valve body 11, one end of the sliding part 50 can be supported, improving the stability and reliability of the sliding part 50 during reciprocating movement. The placement of the D-capillary tube 62 between the single valve port 12 and the support ring 16 ensures smooth fluid flow.

[0051] Specifically, the main valve body 10 has a first flow chamber 13, the middle valve body 20 has a second flow chamber 21, the second flow chamber 21 is connected to the S capillary tube 64, and the auxiliary valve body 30 has a third flow chamber 33; the sliding part 50 passes through the first flow chamber 13, the second flow chamber 21 and the third flow chamber 33, and the sliding part 50 has a flow channel 511 inside. The side wall of the sliding part 50 has a DC flow hole 512 and a DE flow hole 513 spaced apart, wherein the DC flow hole 512 connects the first flow chamber 13 and the flow channel 511, and the DE flow hole 513 connects the third flow chamber 33 and the flow channel 511. Channel 511 is connected, and capillary tube 62 and the first flow chamber 13 are connected; wherein, when the sliding part 50 is in the cooling position, capillary tube 61 and the first flow chamber 13 are connected, and capillary tube 61 and the second flow chamber 21 are disconnected, capillary tube 63 and the second flow chamber 21 are connected, and capillary tube 63 and the third flow chamber 33 are disconnected; when the sliding part 50 is in the heating position, capillary tube 61 and the first flow chamber 13 are disconnected, capillary tube 61 and the second flow chamber 21 are connected, capillary tube 63 and the second flow chamber 21 are disconnected, and capillary tube 63 and the third flow chamber 33 are connected.

[0052] With the above configuration, when the sliding part 50 is in the cooling position, the fluid enters from the D capillary tube 62. Since the C capillary tube 61 is connected to the first flow chamber 13 and the C capillary tube 61 is disconnected from the second flow chamber 21, the fluid can flow smoothly out of the C capillary tube 61 and will not enter the second flow chamber 21. At this time, the E capillary tube 63 is connected to the second flow chamber 21 and the E capillary tube 63 is disconnected from the third flow chamber 33. In this way, the fluid will not enter the E capillary tube 63 through the third flow chamber 33, thereby achieving the cooling state.

[0053] When the sliding part 50 is in the heating position, the fluid enters from the D capillary 62, flows out from the third flow chamber 33 through the sliding part 50. Since the E capillary 63 and the third flow chamber 33 are connected, and the E capillary 63 and the second flow chamber 21 are disconnected, the fluid can flow out smoothly from the E capillary 63. At this time, the C capillary 61 and the first flow chamber 13 are disconnected, and the C capillary 61 and the second flow chamber 21 are connected, thereby realizing the heating state.

[0054] The single valve port 12 has a first flow cavity 13, and the end cap 32 has a third flow cavity 33.

[0055] Furthermore, the first flow chamber 13 has a first valve port 131 at one end facing the central valve body 20, the second flow chamber 21 has a second valve port 211 and a third valve port 212 at both ends, with the second valve port 211 located between the third valve port 212 and the first valve port 131, and the third flow chamber 33 has a fourth valve port 331 at one end facing the central valve body 20; the sliding part 50 includes a valve stem 51 and a first sealing ring 52, a second sealing ring 53, a third sealing ring 54 and a fourth sealing ring 55 sequentially arranged on the valve stem 51, the valve stem 51 is connected to the core iron 40, and the valve stem 51 has a flow passage The sliding part 50 includes a flow channel 511, a DC flow hole 512, and a DE flow hole 513. When the sliding part 50 is in the cooling position, the first sealing ring 52 avoids the first valve port 131, the second sealing ring 53 blocks the second valve port 211, the third sealing ring 54 avoids the third valve port 212, and the fourth sealing ring 55 blocks the fourth valve port 331. When the sliding part 50 is in the heating position, the first sealing ring 52 blocks the first valve port 131, the second sealing ring 53 avoids the second valve port 211, the third sealing ring 54 blocks the third valve port 212, and the fourth sealing ring 55 avoids the fourth valve port 331. By setting the first valve port 131, the second valve port 211, the third valve port 212, and the fourth valve port 331, the fluid flow rate is increased while facilitating sealing by the first sealing ring 52, the second sealing ring 53, the third sealing ring 54, and the fourth sealing ring 55, thus improving the sealing effect. The flow channel 511, DC flow hole 512, and DE flow hole 513 are provided to facilitate smooth fluid flow. Moreover, the flow rate of the pilot valve can be adjusted by adjusting the opening angle and opening size of the first valve port 131, the second valve port 211, the third valve port 212, or the fourth valve port 331, making it widely applicable and low in manufacturing cost.

[0056] In this embodiment, the flow area of ​​capillary D 62 is S1, the flow area between the first flow chamber 13 and the valve stem 51 is S2, the flow areas of capillary C 61, capillary S 64, and capillary E 63 are all S4, the flow area of ​​flow hole DC 512 is S5, the flow area of ​​flow hole DE 513 is S6, the flow area between the third flow chamber 33 and the valve stem 51 is S7, the flow area of ​​flow channel 511 is S8, and the flow area between the second flow chamber 21 and the valve stem 51 is S9; the sliding part 50 is in the cooling position. When the sliding part 50 is in the heating position, the flow area between the first sealing ring 52 and the first valve port 131 is S3, and the flow area between the third sealing ring 54 and the third valve port 212 is S10; when the sliding part 50 is in the heating position, the flow area between the fourth sealing ring 55 and the fourth valve port 331 is S11, and the flow area between the second sealing ring 53 and the second valve port 211 is S10; wherein, S8≥S5≥S2≥S3≥S1≥S4, and / or S8≥S6≥S7≥S11≥S1≥S4, and / or S9≥S10.

[0057] With the above settings, when the sliding part 50 is in the cooling or heating position, the flow area of ​​each part is limited to the above range, which can ensure that the fluid entering from the capillary tube 62 does not have a throttling point during the flow process and does not generate backflow problems, thereby increasing the flow rate of the pilot valve and improving the stability and reliability of the pilot valve during operation.

[0058] The DC flow hole 512 has multiple C-shaped sub-holes distributed circumferentially along the valve stem 51. Each C-shaped sub-hole is connected to the flow channel 511 and the first flow chamber 13 at both ends. The DE flow hole 513 has multiple E-shaped sub-holes distributed circumferentially along the valve stem 51. Each E-shaped sub-hole is connected to the flow channel 511 and the third flow chamber 33 at both ends. By providing multiple C-shaped sub-holes distributed circumferentially along the valve stem 51, the outflow rate of the fluid can be effectively increased. Furthermore, this arrangement avoids reducing the strength of the valve stem 51 due to the openings.

[0059] In this embodiment, the valve stem 51 includes a stem body 514 and a first retaining ring 5151, a second retaining ring 5152, a third retaining ring 5153, a fourth retaining ring 5154, a fifth retaining ring 5155, and a sixth retaining ring 5156 sequentially disposed on the stem body 514. A first sealing ring 52 is located between the first retaining ring 5151 and the second retaining ring 5152; a second sealing ring 53 is located between the second retaining ring 5152 and the third retaining ring 5153; a third sealing ring 54 is located between the fourth retaining ring 5154 and the fifth retaining ring 5155; and a fourth sealing ring 55 is located between the fifth retaining ring 5155 and the sixth retaining ring 5156. The arrangement of 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 facilitates the installation and fixation of the first sealing ring 52, the second sealing ring 53, the third sealing ring 54, and the fourth sealing ring 55.

[0060] Furthermore, 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 of the same size. The first retaining ring 5151, the third retaining ring 5153, the fourth retaining ring 5154, and the sixth retaining ring 5156 are of the same size. The second retaining ring 5152 and the fifth retaining ring 5155 are of the same size. The outer diameter of the first retaining ring 5151 is smaller than the outer diameter of the second retaining ring 5152, and the outer diameter of the second retaining ring 5152 is less 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 of the same size. The outer diameter of the first sealing ring 52 is larger than the outer diameter of the second retaining ring 5152. By adopting the above setting method, 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. This not only ensures the limiting of the sealing ring, but also reduces the impact on fluid flow, ensuring smooth flow and reducing resistance.

[0061] In this embodiment, the sliding part 50 includes a valve stem 51 with a flow channel 511. One end of the valve stem 51 has an external thread, and the outer wall of the valve stem 51 has a hexagonal mating surface. Both ends of the core iron 40 have internal threads and hexagonal countersunk holes 41, respectively, with the internal and external threads engaging. The external thread is provided for threaded engagement with the core iron 40, facilitating installation and disassembly. The hexagonal mating surface and hexagonal countersunk holes 41 facilitate installation and disassembly by operators. A hexagonal wrench can be inserted into the hexagonal countersunk hole 41, thereby defining the circumferential position of the core iron 40. A hexagonal sleeve can be fitted onto the hexagonal mating surface for tightening operations.

[0062] The valve stem 51 also has a first balancing hole 516, which is connected to the flow channel 511. The core iron 40 also has a second balancing hole 42, the two ends of which are connected to the hexagonal countersunk hole 41 and the first balancing hole 516, respectively. By connecting the first balancing hole 516 to the flow channel 511, the internal pressure difference of the valve stem 51 can be balanced during its reciprocating movement. In this embodiment, the inner diameter of the flow channel 511 is greater than or equal to the inner diameters of the first balancing hole 516 and the second balancing hole 42.

[0063] like Figure 1 As shown, the main valve body 10 also includes an attractor 14 and an elastic member 15. The attractor 14 is disposed within the main valve body 11, and the elastic member 15 is located between the attractor 14 and the core iron 40. When the core iron 40 and the support ring 16 are in contact, the sliding part 50 is in a cooling position; when the core iron 40 and the attractor 14 are in contact, the sliding part 50 is in a heating position. By providing the attractor 14 and the elastic member 15, the core iron 40 is attracted to move, thereby moving the sliding part 50 to the cooling or heating position.

[0064] In this embodiment, the outer wall of the single valve port 12 has a first weld 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 cap 32 has a second weld ring groove 321, and the outer wall of the end cap 32 is welded to the inner wall of the auxiliary valve body 31; the outer wall of the support ring 16 has a third weld ring groove 161, and the outer wall of the support ring 16 is welded to the inner wall of the main valve body 11; the two ends of the middle valve body 20 have a first annular step and a second annular step, respectively, the main valve body 11 is welded to the first annular step, and the auxiliary valve body 31 is welded to the second annular step. The first weld ring groove 121, the second weld ring groove 321, and the third weld ring groove 161 are provided to accommodate the solder for subsequent welding; the first annular step and the second annular step are provided to facilitate welding of the main valve body 11, the auxiliary valve body 31, and the middle valve body 20.

[0065] like Figure 14 As shown, according to another aspect of the present invention, a four-way valve is provided, comprising a main valve and the aforementioned pilot valve. In this configuration, capillary tubes C 61 and D 62 are connected to the main valve body, capillary tube S 64 is connected to the intermediate valve body, and capillary tube E 63 is connected to the auxiliary valve body 30. This configuration eliminates the need for a pilot valve seat connected to capillary tubes C 61, E 63, and S 64. This allows the orifice size to be adjusted according to the diameters of capillary tubes C 61, D 62, E 63, and S 64, thereby increasing the pilot valve flow rate and improving the switching efficiency of the four-way valve.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pilot valve characterized by, include: The main valve body (10), the middle valve body (20), and the auxiliary valve body (30) are sequentially sealed and connected. The core iron (40) is disposed within the main valve body (10) in a reciprocating manner; A sliding part (50) is inserted into the main valve body (10), the middle valve body (20) and the auxiliary valve body (30), and the sliding part (50) is connected to the core iron (40) to move with the core iron (40); C capillary (61), D capillary (62), E capillary (63) and S capillary (64), wherein C capillary (61) and D capillary (62) are connected to the main valve body (10), S capillary (64) is connected to the middle valve body (20), and E capillary (63) is connected to the auxiliary valve body (30); The sliding part (50) has a cooling position and a heating position. When the sliding part (50) is in the cooling position, the D capillary (62) and the C capillary (61) are connected, and the S capillary (64) and the E capillary (63) are connected. When the sliding part (50) is in the heating position, the D capillary (62) and the E capillary (63) are connected, and the S capillary (64) and the C capillary (61) are connected.

2. Pilot valve according to claim 1, characterized in that The main valve body (10) includes a main valve body (11) and a single valve port (12). The core iron (40) and the single valve port (12) are both disposed inside the main valve body (11). The C capillary tube (61) is located on the side of the single valve port (12) facing the middle valve body (20), and the D capillary tube (62) is located on the side of the single valve port (12) facing the core iron (40). The secondary valve body (30) includes a secondary valve body (31) and an end cap (32) connected to each other. The two ends of the middle valve body (20) are respectively connected to the main valve body (11) and the secondary 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 both connected to the main valve body (11), and the E capillary tube (63) is connected to the secondary valve body (31). The C capillary tube (61), the D capillary tube (62), the S capillary tube (64), and the E capillary tube (63) are arranged in parallel. The C capillary tube (61), the S capillary tube (64), and the E capillary tube (63) are all located on the same side of the sliding part (50). The D capillary tube (62) is located on the side of the sliding part (50) away from the C capillary tube (61). The axes of the C capillary tube (61), the S capillary tube (64), the E capillary tube (63), the D capillary tube (62), and the sliding part (50) are all located on the same plane.

4. The pilot valve of claim 2, wherein, The main valve body (11) has a first flange (111) and a third flange (112). One end of the C capillary (61) is inserted into the first flange (111) and welded to the inner wall of the first flange (111). One end of the D capillary (62) is inserted into the third flange (112) and welded to the inner wall of the third flange (112). The secondary valve body (31) has a second flange (311). One end of the E capillary (63) is inserted into the second flange (311) and welded to the inner wall of the second flange (311). The side wall of the middle valve body (20) has an S mounting hole. One end of the S capillary (64) is inserted into the S mounting hole and welded. The end face of the S capillary (64) abuts against the stop surface in the S mounting hole.

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

6. The pilot valve according to claim 1, characterized in that, The main valve body (10) has a first flow chamber (13), the middle valve body (20) has a second flow chamber (21), the second flow chamber (21) is connected to the S capillary tube (64), and the auxiliary valve body (30) has a third flow chamber (33). The sliding part (50) passes through the first flow cavity (13), the second flow cavity (21) and the third flow cavity (33). The sliding part (50) has a flow channel (511). The side wall of the sliding part (50) has a DC flow hole (512) and a DE flow hole (513) arranged at intervals. The DC flow hole (512) connects the first flow cavity (13) and the flow channel (511). The DE flow hole (513) connects the third flow cavity (33) and the flow channel (511). The D capillary (62) is connected to the first flow cavity (13). When the sliding part (50) is in the cooling position, the C capillary (61) is connected to the first flow chamber (13), and the C capillary (61) is disconnected from the second flow chamber (21). The E capillary (63) is connected to the second flow chamber (21), and the E capillary (63) is disconnected from the third flow chamber (33). When the sliding part (50) is in the heating position, the C capillary (61) is disconnected from the first flow chamber (13), and the C capillary (61) is connected to the second flow chamber (21). The E capillary (63) is disconnected from the second flow chamber (21), and the E capillary (63) is connected to the third flow chamber (33).

7. The pilot valve according to claim 6, characterized in that, The first flow cavity (13) has a first valve port (131) at one end facing the middle valve body (20), the second flow cavity (21) has a second valve port (211) and a third valve port (212) at both ends, and the second valve port (211) is located between the third valve port (212) and the first valve port (131). The third flow cavity (33) has a fourth valve port (331) at one end facing the middle valve body (20). The sliding part (50) includes a valve stem (51) and a first sealing ring (52), a second sealing ring (53), a third sealing ring (54) and a fourth sealing ring (55) sequentially disposed on the valve stem (51). The valve stem (51) is connected to the core iron (40). The valve stem (51) has the flow channel (511), the DC flow hole (512) and the DE flow hole (513). When the sliding part (50) is in the cooling position, the first sealing ring (52) avoids the first valve port (131), the second sealing ring (53) blocks the second valve port (211), the third sealing ring (54) avoids the third valve port (212), and the fourth sealing ring (55) blocks the fourth valve port (331); when the sliding part (50) is in the heating position, the first sealing ring (52) blocks the first valve port (131), the second sealing ring (53) avoids the second valve port (211), the third sealing ring (54) blocks the third valve port (212), and the fourth sealing ring (55) avoids the fourth valve port (331).

8. The pilot valve according to claim 7, characterized in that, The flow area of ​​the D capillary (62) is S1, the flow area between the first flow cavity (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 DC flow hole (512) is S5, the flow area of ​​the DE flow hole (513) is S6, the flow area between the third flow cavity (33) and the valve stem (51) is S7, the flow area of ​​the flow channel (511) is S8, and the flow area between the second flow cavity (21) and the valve stem (51) is S9. When the sliding part (50) is in the cooling position, the flow area between the first sealing ring (52) and the first valve port (131) is S3, and the flow area between the third sealing ring (54) and the third valve port (212) is S10. When the sliding part (50) is in the heating position, the flow area between the fourth sealing ring (55) and the fourth valve port (331) is S11, and the flow area between the second sealing ring (53) and the second valve port (211) is S10. Among them, S8≥S5≥S2≥S3≥S1≥S4, and / or S8≥S6≥S7≥S11≥S1≥S4, and / or S9≥S10.

9. Pilot valve according to claim 7, characterized in that The DC flow hole (512) has multiple C sub-holes, which are distributed circumferentially along the valve stem (51). Each C sub-hole is connected to the flow channel (511) and the first flow cavity (13) at both ends. The DE flow hole (513) has multiple E sub-holes, which are distributed circumferentially along the valve stem (51). Each E sub-hole is connected to the flow channel (511) and the third flow cavity (33) at both ends.

10. The pilot valve of claim 7, wherein, The valve stem (51) includes a stem body (514) and a first retaining ring (5151), a second retaining ring (5152), a third retaining ring (5153), a fourth retaining ring (5154), a fifth retaining ring (5155), and a sixth retaining ring (5156) sequentially disposed on the stem body (514). The first sealing ring (52) is located between the first retaining ring (5151) and the second retaining ring (5152). The second sealing ring (53) is located between the second retaining ring (5152) and the third retaining ring (5153). The third sealing ring (54) is located between the fourth retaining ring (5154) and the fifth retaining ring (5155). The fourth sealing ring (55) is located between the fifth retaining ring (5155) and the sixth retaining ring (5156).

11. Pilot valve according to claim 10, characterized in that 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 of the same size. The first retaining ring (5151), the third retaining ring (5153), the fourth retaining ring (5154), and the sixth retaining ring (5156) are of the same size. The second retaining ring (5152) and the fifth retaining ring (5155) are of the same size. The outer diameter of the first retaining ring (5151) is smaller than the outer diameter of the second retaining ring (5152), and the outer diameter of the second retaining ring (5152) is less 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 of the same size. The outer diameter of the first sealing ring (52) is larger than the outer diameter of the second retaining ring (5152).

12. The pilot valve of claim 6, wherein, The sliding part (50) includes a valve stem (51), the valve stem (51) has the flow channel (511), one end of the valve stem (51) has an external thread, the outer wall of the valve stem (51) has a hexagonal mating surface, and both ends of the core iron (40) have internal threads and hexagonal countersunk holes (41) respectively, the internal threads and the external threads are mated.

13. Pilot valve according to claim 12, characterized in that The valve stem (51) also has a first balance hole (516), which is connected to the flow channel (511). The core iron (40) also has a second balance hole (42), which is connected to the hexagonal countersunk hole (41) and the first balance hole (516) at both ends.

14. The pilot valve of claim 5 wherein, The main valve body (10) further includes an attractor (14) and an elastic member (15). The attractor (14) is disposed inside the main valve body (11), and the elastic member (15) is located between the attractor (14) and the core iron (40). When the core iron (40) and the support ring (16) abut against each other, the sliding part (50) is in the cooling position, and when the core iron (40) and the attractor (14) abut against each other, the sliding part (50) is in the heating position.

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

16. A four-way valve characterized by The four-way valve includes a main valve and a pilot valve as described in any one of claims 1 to 15.

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