Two-way throttle valve

Abstract

The present application relates to a two-way throttle valve, including a valve tube, a connecting piece, a first valve core assembly and a second valve core assembly. The connecting piece is arranged in the valve tube and divides the interior of the valve tube into a first valve cavity and a second valve cavity. The connecting piece is provided with a first chamber, a second chamber, a first channel and a second channel. The first chamber is located at one end of the connecting piece close to the first valve cavity, the second chamber is located at one end of the connecting piece close to the second valve cavity, the first channel connects the first chamber and the second valve cavity, and the second channel connects the second chamber and the first valve cavity. The first valve core assembly is arranged at the first chamber. The second valve core assembly is arranged at the second chamber. The first channel and the second channel are both arranged as straight-line channels inclined axially relative to the connecting piece. The two-way throttle valve of the present application has fewer parts, a simple structure and a very simple installation process, thereby greatly reducing the production cost of the two-way throttle valve. When the fluid flows in the first channel and the second channel, the flow resistance is small, so that the stability of the two-way throttle valve is better.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a two-way throttle valve. Background Art

[0002] Throttle valves are mainly used in air conditioning and refrigeration systems and are an important part of refrigeration systems. Bidirectional throttle valves are mainly used in cooling and heating air conditioning systems. Two throttle valve components are connected in parallel or in series to achieve a bidirectional flow function.

[0003] The existing two-way throttle valve has many parts, a complicated assembly process and high production cost. Summary of the invention

[0004] In view of this, it is necessary to provide a two-way throttle valve that can simplify the structure, simplify the assembly process, and reduce costs.

[0005] The present invention provides a two-way throttle valve, comprising:

[0006] Valve pipe;

[0007] a connecting piece, which is arranged in the valve tube and divides the interior of the valve tube into a first valve cavity and a second valve cavity, wherein the connecting piece is provided with a first chamber, a second chamber, a first channel and a second channel, wherein the first chamber is located at one end of the connecting piece close to the first valve cavity, the second chamber is located at one end of the connecting piece close to the second valve cavity, the first channel connects the first chamber and the second valve cavity, and the second channel connects the second chamber and the first valve cavity;

[0008] A first valve core assembly is disposed at the first chamber and is used to automatically adjust the flow rate between the first channel and the first valve chamber; and

[0009] A second valve core assembly is disposed at the second chamber and is used to automatically adjust the flow between the second channel and the second valve chamber;

[0010] The first channel is configured as a straight channel inclined relative to the axial direction of the connecting piece;

[0011] The second channel is configured as a linear channel inclined relative to the axial direction of the connecting member.

[0012] In one embodiment, the first channel has a first port connected to the outer wall of the connecting member, the first channel is connected to the second valve cavity through the first port, and the connecting member is provided with an annular first groove at the first port of the first channel;

[0013] And / or, the second channel has a second port connected to the outer wall of the connecting member, the second channel is connected to the first valve cavity through the second port, and the connecting member is provided with a second annular groove at the second port of the second channel.

[0014] In one embodiment, the connecting piece is a columnar structure, and an annular outer boss is provided on the outer middle section of the connecting piece. One of the annular outer boss and the valve tube is provided with a limiting protrusion, and the other is provided with a limiting groove. The protrusion is adapted to the limiting groove to achieve a sealed connection between the connecting piece and the valve tube.

[0015] In one embodiment, the connecting member includes a first connecting section located in the first valve cavity, the first chamber is located in the first connecting section, a first gap is formed between the outer wall of the first connecting section and the inner wall of the valve tube, and the second channel has a second port connected to the outer wall of the first connecting section, and the second port is connected to the first gap;

[0016] And / or, the connecting piece includes a second connecting section located in the second valve cavity, the second chamber is located in the second connecting section, a second gap is formed between the outer wall of the second connecting section and the inner wall of the valve tube, and the first channel has a first port connected to the outer wall of the second connecting section, and the first port is connected to the second gap.

[0017] In one embodiment, the connecting piece, the first valve core assembly and the second valve core assembly are coaxially arranged.

[0018] In one embodiment, the first valve core assembly is welded to the connecting piece, the first chamber is configured as a stepped hole, and an end of the stepped hole with a larger aperture passes through an end surface of the connecting piece;

[0019] And / or, the second valve core assembly is welded to the connecting piece, and the second chamber is configured as a stepped hole, and an end of the stepped hole with a larger aperture passes through the other end surface of the connecting piece.

[0020] In one embodiment, the first valve core assembly includes:

[0021] A first valve seat, comprising a first seat cavity, a first valve port and a second valve port, wherein the first valve port and the second valve port are respectively arranged at two ends of the first seat cavity and communicated with the first seat cavity, and the first valve port is arranged close to the first chamber;

[0022] A first valve needle is movably disposed in the first seat cavity to adjust the flow area of ​​the first valve port;

[0023] A first sealing head is disposed at the second valve port, a gap communicating with the first seat cavity and the first valve cavity being left between the first sealing head and the first valve seat; and

[0024] The first elastic member has two ends respectively abutting against the first valve needle and the first sealing head, so that the first valve needle has a tendency to reduce the flow area of ​​the first valve port.

[0025] In one embodiment, the first seat cavity includes a first guide hole and a first process hole that are connected to each other. The first guide hole is arranged close to the first valve port, and the first process hole is arranged close to the second valve port. The aperture of the first process hole is greater than or equal to the aperture of the first guide hole.

[0026] In one embodiment, the first valve seat is further provided with a first silencing cavity, the first silencing cavity is provided at one end of the first valve port away from the first seat cavity and is communicated with the first valve port, and the inner diameter of the first silencing cavity is larger than the inner diameter of the first valve port and smaller than the inner diameter of the first seat cavity;

[0027] One end of the first channel is connected to the first silencing cavity, and a first flare is provided at the connection between the first channel and the first silencing cavity. The inner diameter of the first flare gradually increases from one end close to the first channel to one end close to the first silencing cavity.

[0028] In one embodiment, the second valve core assembly includes:

[0029] A second valve seat, comprising a second seat cavity, a third valve port and a fourth valve port, wherein the third valve port and the fourth valve port are respectively arranged at two ends of the second seat cavity and communicate with the second seat cavity, and the third valve port is arranged close to the second cavity;

[0030] A second valve needle is movably disposed in the second seat cavity to adjust the flow area of ​​the third valve port;

[0031] A second sealing head is disposed at the fourth valve port, a gap communicating with the second seat cavity and the second valve cavity being left between the second sealing head and the second valve seat; and

[0032] The second elastic member has two ends respectively abutting against the second valve needle and the second sealing head, so that the second valve needle has a tendency to reduce the flow area of ​​the third valve port.

[0033] In one embodiment, the second seat cavity includes a second guide hole and a second process hole that are connected to each other, the second guide hole is arranged close to the third valve port, the second process hole is arranged close to the fourth valve port, and the aperture of the second process hole is greater than or equal to the aperture of the second guide hole.

[0034] In one embodiment, the second valve seat is further provided with a second silencing cavity, the second silencing cavity is provided at one end of the third valve port away from the second seat cavity and is communicated with the third valve port, and the inner diameter of the second silencing cavity is larger than the inner diameter of the third valve port and smaller than the inner diameter of the second seat cavity;

[0035] One end of the second channel is connected to the second silencing chamber, and a second flare is provided at the connection between the second channel and the second silencing chamber, and the inner diameter of the second flare gradually increases from one end close to the second channel to one end close to the second silencing chamber.

[0036] The two-way throttle valve provided by the present invention can realize a two-way flow function through a valve tube, a connecting piece, a first valve core assembly and a second valve core assembly, has fewer parts and a very simple structure. During installation, it is only necessary to install the connecting piece in the valve tube, and install the first valve core assembly and the second valve core assembly at both ends of the connecting piece respectively, to complete the assembly of the two-way throttle valve. The installation process is very simple, which reduces the probability of defects in the assembly process, is conducive to improving product consistency, and thus greatly reduces the production cost of the two-way throttle valve. The first channel and the second channel are both configured as straight-line channels that are inclined relative to the axial direction of the connecting piece. When the fluid flows in the first channel and the second channel, the flow resistance is small, so that the stability of the two-way throttle valve is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of a two-way throttle valve according to an embodiment of the present invention;

[0038] Figure 2 It is a schematic diagram of the assembly structure of a connecting piece, a first valve seat and a second valve seat according to an embodiment of the present invention;

[0039] Figure 3 is a schematic cross-sectional structural diagram of a connecting piece according to an embodiment of the present invention;

[0040] Figure 4 It is a schematic diagram of the side structure of a connecting piece according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic structural diagram of a first valve seat according to an embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the structure of a second valve seat according to an embodiment of the present invention.

[0043] Figure numerals: 10, valve tube; 11, first valve cavity; 12, second valve cavity; 13, limiting protrusion; 20, connecting piece; 21, first chamber; 22, second chamber; 23, first channel; 231, first port; 232, first flare; 24, second channel; 241, second port; 242, second flare; 25, annular outer boss; 251, limiting groove; 26, first connecting section; 261, first gap; 27, second connecting section; 271, second gap; 28, first groove; 29, second groove; 30, first valve core assembly; 31, first valve seat; 311, first seat cavity; 3111, first guide hole; 311 2. First process hole; 312. First valve port; 313. Second valve port; 314. First silencer chamber; 32. First valve needle; 321. First needle body; 322. First needle portion; 323. First mounting portion; 33. First end cap; 34. First elastic member; 40. Second valve core assembly; 41. Second valve seat; 411. Second seat chamber; 4111. Second guide hole; 4112. Second process hole; 412. Third valve port; 413. Fourth valve port; 414. Second silencer chamber; 42. Second valve needle; 421. Second needle body; 422. Second needle portion; 423. Second mounting portion; 43. Second end cap; 44. Second elastic member. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] See also Figure 1-2The present invention provides a two-way throttle valve, which can be used in an air conditioning refrigeration system. The two-way throttle valve includes a valve pipe 10, a connecting piece 20, a first valve core component 30 and a second valve core component 40.

[0048] The connecting piece 20 is arranged in the valve tube 10 and divides the inside of the valve tube 10 into a first valve cavity 11 and a second valve cavity 12. The connecting piece 20 is provided with a first chamber 21, a second chamber 22, a first channel 23 and a second channel 24. The first chamber 21 is located at one end of the connecting piece 20 close to the first valve cavity 11, and the second chamber 22 is located at one end of the connecting piece 20 close to the second valve cavity 12. The first channel 23 connects the first chamber 21 and the second valve cavity 12, and the second channel 24 connects the second chamber 22 and the first valve cavity 11. The first valve core assembly 30 is arranged at the first chamber 21 to automatically adjust the flow rate between the first channel 23 and the first valve cavity 11. The second valve core assembly 40 is arranged at the second chamber 22 to adjust the flow rate between the second channel 24 and the second valve cavity 12.

[0049] During operation, the fluid can enter the second channel 24 from the first valve cavity 11, then enter the second chamber 22, then enter the second valve core assembly 40, and finally enter the second valve cavity 12. The fluid can also enter the first channel 23 from the second valve cavity 12, then enter the first chamber 21, then enter the first valve core assembly 30, and finally enter the first valve cavity 11. In this way, the two-way throttle valve can achieve a two-way flow function through the valve tube 10, the connecting piece 20, the first valve core assembly 30 and the second valve core assembly 40, with fewer parts and a very simple structure. During installation, it is only necessary to install the connecting piece 20 in the valve tube 10, and install the first valve core assembly 30 and the second valve core assembly 40 at both ends of the connecting piece 20 respectively, so as to complete the assembly of the two-way throttle valve. The installation process is also very simple, which reduces the probability of defects in the assembly process, is conducive to improving product consistency, and thus greatly reduces the production cost of the two-way throttle valve. "Product consistency" means that different products are basically the same during mass production.

[0050] Further, the first channel 23 is configured as a straight channel inclined relative to the axial direction of the connecting piece 20. In this way, when the fluid flows in the first channel 23, the flow resistance is small, so that the stability of the two-way throttle valve is better. Correspondingly, the second channel 24 is also configured as a straight channel inclined relative to the axial direction of the connecting piece 20. Similarly, when the fluid flows in the second channel 24, the flow resistance is small, so that the stability of the two-way throttle valve is better.

[0051] The first channel 23 has a first port 231 connected to the outer wall of the connecting member 20. The first channel 23 is connected to the second valve chamber 12 through the first port 231. The connecting member 20 is provided with an annular first groove 28 at the first port 231 of the first channel 23. The annular first groove 28 is provided so that the fluid has a larger fluid capacity at the first port 231 of the first channel 23, so that the fluid is not easily interrupted, the stability of the fluid flow can be ensured, and it is conducive to better control of the fluid.

[0052] Similarly, the second channel 24 has a second port 241 connected to the outer wall of the connecting member 20, and the second channel 24 is connected to the first valve chamber 11 through the second port 241. The connecting member 20 is provided with an annular second groove 29 at the second port 241 of the second channel 24. The annular second groove 29 is provided so that the fluid has a larger fluid capacity at the second port 241 of the second channel 24, so that the fluid is not easily cut off, the stability of the fluid flow can be ensured, and it is conducive to better control of the fluid.

[0053] In this embodiment, the connecting piece 20, the first valve core assembly 30 and the second valve core assembly 40 are coaxially arranged. The coaxial arrangement makes the overall occupied space of the connecting piece 20, the first valve core assembly 30 and the second valve core assembly 40 smaller, which is conducive to the miniaturized design of the valve tube 10 and greatly reduces the occupied space of the two-way throttle valve.

[0054] For further information, see Figure 1-4 , the connecting piece 20 is a columnar structure. An annular outer boss 25 is provided in the middle section of the outer part of the connecting piece 20. One of the annular outer boss 25 and the valve tube 10 is provided with a limiting protrusion 13, and the other is provided with a limiting groove 251. The protrusion and the limiting groove 251 are adapted to achieve a sealed connection between the connecting piece 20 and the valve tube 10, so that when the connecting piece 20 is installed in the valve tube 10, the connecting piece 20 divides the inside of the valve tube 10 into a first valve cavity 11 and a second valve cavity 12. In this embodiment, the outer wall of the annular outer boss 25 is provided with a limiting groove 251, and the inner wall of the valve tube 10 is provided with a limiting protrusion 13. During processing, the valve tube 10 can be pressurized inwardly by extrusion deformation, so that the inner wall of the valve tube 10 can form a limiting protrusion 13, and the processing method is very simple. Of course, it can also be reversed, the outer wall of the annular outer boss 25 is provided with a limiting protrusion 13, and the inner wall of the valve tube 10 is provided with a limiting groove 251.

[0055] The connecting member 20 includes a first connecting section 26 located in the first valve cavity 11, the first chamber 21 is located in the first connecting section 26, a first gap 261 is formed between the outer wall of the first connecting section 26 and the inner wall of the valve tube 10, the second port 241 of the second channel 24 is connected to the outer wall of the first connecting section 26, the second port 241 is connected to the first gap 261, and thus the second channel 24 is connected to the first valve cavity 11. In this way, the structure is very compact, which is conducive to the miniaturization design of the two-way throttle valve.

[0056] The connecting member 20 further includes a second connecting section 27 located in the second valve cavity 12, the second chamber 22 is located in the second connecting section 27, a second gap 271 is formed between the outer wall of the second connecting section 27 and the inner wall of the valve tube 10, the first port 231 of the first channel 23 is connected to the outer wall of the second connecting section 27, the first port 231 is connected to the second gap 271, and thus the first channel 23 is connected to the second valve cavity 12. In this way, the structure is very compact, which is conducive to the miniaturization design of the two-way throttle valve.

[0057] In this embodiment, the first valve core assembly 30 is connected to the connecting piece 20 by welding. The connection is made by welding, and the first valve core assembly 30 and the connecting piece 20 are firmly connected and have good sealing performance. Connecting the first valve core assembly 30 and the connecting piece 20 by welding is conducive to simplifying the processing process and improving the consistency of the product. During welding, the solder flows into the gap between the first valve core assembly 30 and the first chamber 21. In order to better flow the solder, the first chamber 21 is set as a step hole, and the end with a larger aperture of the step hole passes through one end face of the connecting piece 20. The first chamber 21 is set as a step hole, which is convenient for loading one end of the first valve core assembly 30 into the first chamber 21, and also convenient for the solder to flow into the first chamber 21 from the end with a larger aperture, so that the first valve core assembly 30 and the connecting piece 20 are firmly welded.

[0058] Correspondingly, the second valve core assembly 40 is connected to the connecting piece 20 by welding. When the second valve core assembly 40 and the connecting piece 20 are connected by welding, the second valve core assembly 40 and the connecting piece 20 are firmly connected and have good sealing performance. In addition, it is helpful to simplify the processing process and improve the consistency of the product. The second chamber 22 is configured as a stepped hole, and the end with a larger aperture of the stepped hole passes through the other end face of the connecting piece 20. The second chamber 22 is configured as a stepped hole, which is convenient for loading one end of the second valve core assembly 40 into the second chamber 22, and also for the solder to flow into the second chamber 22 from the end with a larger aperture, so that the second valve core assembly 40 and the connecting piece 20 are firmly welded.

[0059] In this embodiment, the first valve core assembly 30 and the second valve core assembly 40 are independently controlled, with high control accuracy and long service life.

[0060] Specifically, see Figure 1 , Figure 2 and Figure 5 The first valve core assembly 30 includes a first valve seat 31, a first valve needle 32, a first end cap 33 and a first elastic member 34. The first valve seat 31 is provided with a first seat cavity 311, a first valve port 312 and a second valve port 313. The first valve port 312 and the second valve port 313 are respectively arranged at two ends of the first seat cavity 311 and communicate with the first seat cavity 311, and the first valve port 312 is arranged close to the first chamber 21. The first valve needle 32 is movably arranged in the first seat cavity 311 to adjust the size of the flow area of ​​the first valve port 312. When the flow area of ​​the first valve port 312 is zero, the first valve port 312 is in a closed state, and when the flow area of ​​the first valve port 312 is greater than zero, the first valve port 312 is in an open state. "Adjusting the size of the flow area of ​​the first valve port 312" includes both adjusting the size of the flow area of ​​the first valve port 312 in the open state and switching the first valve port 312 between the open state and the closed state. The first seal 33 is arranged at the second valve port 313, and a gap connecting the first seat cavity 311 and the first valve cavity 11 is left between the first seal 33 and the first valve seat 31 for fluid to pass through. The two ends of the first elastic member 34 are respectively in contact with the first valve needle 32 and the first seal 33, so that the first valve needle 32 has a tendency to reduce the flow area of ​​the first valve port 312. When the flow area of ​​the first valve port 312 is reduced to zero, the first valve port 312 is closed. When the fluid pressure in the first channel 23 is greater than the elastic force of the first elastic member 34, the fluid pushes the first valve needle 32 to move, thereby compressing the first elastic member 34 and opening the first valve port 312 or increasing the flow area of ​​the first valve port 312. The greater the fluid pressure in the first channel 23, the greater the flow area of ​​the first valve port 312, so that the fluid flows from the first channel 23 through the first valve port 312, the first seat cavity 311 and the second valve port 313 in sequence, and finally enters the first valve cavity 11. When the fluid pressure in the first channel 23 is less than the elastic force of the first elastic member 34 , the first valve needle 32 moves in the opposite direction under the elastic force of the first elastic member 34 and reduces the flow area of ​​the first valve port 312 , or even closes the first valve port 312 .

[0061] When the first valve core assembly 30 is installed, the welding connection between the first valve core assembly 30 and the connecting piece 20 is achieved through the welding connection between the first valve seat 31 and the inner wall of the first chamber 21 .

[0062] Furthermore, the first seat cavity 311 includes a first guide hole 3111 and a first process hole 3112 which are connected to each other. The first guide hole 3111 is arranged near the first valve port 312, and the first process hole 3112 is arranged near the second valve port 313. The aperture of the first process hole 3112 is greater than or equal to the aperture of the first guide hole 3111. The first process hole 3112 can guide the first valve needle 32 to avoid the first valve needle 32 from being offset during the movement. The aperture of the first process hole 3112 is greater than or equal to the aperture of the first guide hole 3111, which can ensure that the aperture of the first guide hole 3111 meets the design requirements during processing, and ensure that the first valve needle 32 can be smoothly installed in the first guide hole 3111, and the first valve needle 32 can move freely in the first guide hole 3111.

[0063] The inner diameter of the first valve seat 31 at the second valve port 313 is larger than the diameter of the first process hole 3112, so that a step (not shown) is formed between the second valve port 313 and the first process hole 3112, and the first end cap 33 abuts against the step. Figure 5 As shown in FIG. 1 , it is a schematic diagram of the structure of the first valve seat 31 when the first valve needle 32, the first elastic member 34 and the first sealing head 33 are not installed in the first valve seat 31. At this time, the side wall of the second valve port 313 of the first valve seat 31 is in a straight tube shape, which is convenient for sequentially installing the first valve needle 32, the first elastic member 34 and the first sealing head 33 into the first valve seat 31. Figure 1 The figure shows the structure of the two-way throttle valve after the first valve needle 32, the first elastic member 34 and the first end cap 33 are installed in the first valve seat 31; after the first valve needle 32, the first elastic member 34 and the first end cap 33 are installed in the first valve seat 31, the side wall at the second valve port 313 of the first valve seat 31 is squeezed to deform the side wall to form a cone structure, thereby blocking the first end cap 33, and completing the installation of the internal parts of the first valve seat 31. The first end cap 33 is T-shaped, the upper end of the T is fixed at the second valve port 313 and a gap is left between the first valve seat 31 for fluid to pass through; the lower end of the T is used to connect the first elastic member 34. In this embodiment, the first elastic member 34 is a compression spring, one end of which is sleeved on one end of the first end cap 33.

[0064] The first valve needle 32 includes a first needle body 321, a first needle 322 disposed at one end of the first needle body 321, and a first mounting portion 323 disposed at the other end of the first needle body 321. The first needle body 321 is columnar, the outer wall of the first needle body 321 is slidably matched with the inner wall of the first guide hole 3111, and the outer wall of the first needle body 321 is provided with a first fluid passage (not marked), so that the fluid can pass through the first fluid passage. The first needle 322 cooperates with the first valve port 312 to adjust the size of the flow area of ​​the first valve port 312. One end of the first elastic member 34 is sleeved on the outside of the first mounting portion 323.

[0065] The first valve seat 31 is further provided with a first silencing chamber 314, which is provided at one end of the first valve port 312 away from the first seat chamber 311 and communicated with the first valve port 312, and the inner diameter of the first silencing chamber 314 is larger than the inner diameter of the first valve port 312 and smaller than the inner diameter of the first seat chamber 311. One end of the first channel 23 is communicated with the first silencing chamber 314, and a first expansion port 232 is provided at the connection between the first channel 23 and the first silencing chamber 314, and the inner diameter of the first expansion port 232 gradually increases from one end close to the first channel 23 to one end close to the first silencing chamber 314. In this way, when the fluid in the first channel 23 flows to the first seat cavity 311, it passes through the first expansion port 232, the first silencer cavity 314 and the first valve port 312 in sequence, and finally enters the first seat cavity 311. Since the first silencer cavity 314 and the first expansion port 232 are provided, when the fluid flows from the first channel 23 to the first seat cavity 311, the inner diameter of the channel between the first channel 23 and the first seat cavity 311 (the first expansion port 232, the first silencer cavity 314 and the first valve port 312) changes relatively smoothly, and there will be no sudden increase or decrease, thereby reducing the noise generated by the fluid and achieving a silencing effect.

[0066] Likewise, see Figure 1 , Figure 2 and Figure 6The second valve core assembly 40 includes a first valve seat 31, a second valve needle 42, a second end cap 43 and a second elastic member 44. The second valve seat 41 is provided with a second seat cavity 411, a third valve port 412 and a fourth valve port 413. The third valve port 412 and the fourth valve port 413 are respectively arranged at two ends of the second seat cavity 411 and communicate with the second seat cavity 411, and the third valve port 412 is arranged close to the second chamber 22. The second valve needle 42 is movably arranged in the second seat cavity 411 to adjust the size of the flow area of ​​the third valve port 412. When the flow area of ​​the third valve port 412 is zero, the third valve port 412 is in a closed state, and when the flow area of ​​the third valve port 412 is greater than zero, the third valve port 412 is in an open state. "Adjusting the size of the flow area of ​​the third valve port 412" includes both adjusting the size of the flow area of ​​the third valve port 412 in the open state and switching the third valve port 412 between the open state and the closed state. The second seal 43 is arranged at the fourth valve port 413, and a gap connecting the second seat cavity 411 and the second valve cavity 12 is left between the second seal 43 and the second valve seat 41 for fluid to pass through. The two ends of the second elastic member 44 are respectively in contact with the second valve needle 42 and the second seal 43, so that the second valve needle 42 has a tendency to reduce the flow area of ​​the third valve port 412. When the flow area of ​​the third valve port 412 is reduced to zero, the third valve port 412 is closed. When the fluid pressure in the second channel 24 is greater than the elastic force of the second elastic member 44, the fluid pushes the second valve needle 42 to move, thereby compressing the second elastic member 44 and opening the third valve port 412 or increasing the flow area of ​​the third valve port 412. The greater the fluid pressure in the second channel 24, the greater the flow area of ​​the third valve port 412, so that the fluid flows from the second channel 24 through the third valve port 412, the second seat cavity 411 and the fourth valve port 413 in sequence, and finally enters the second valve cavity 12. When the fluid pressure in the second channel 24 is less than the elastic force of the second elastic member 44 , under the elastic force of the second elastic member 44 , the second valve needle 42 moves in the opposite direction and reduces the flow area of ​​the third valve port 412 , or even closes the third valve port 412 .

[0067] When the second valve core assembly 40 is installed, the welding connection between the second valve core assembly 40 and the connecting piece 20 is realized by the welding connection between the second valve seat 41 and the inner wall of the second chamber 22 .

[0068] Further, the second seat cavity 411 includes a second guide hole 4111 and a second process hole 4112 which are connected to each other. The second guide hole 4111 is arranged near the third valve port 412, and the second process hole 4112 is arranged near the fourth valve port 413. The aperture of the second process hole 4112 is greater than or equal to the aperture of the second guide hole 4111. The second process hole 4112 can guide the second valve needle 42 to avoid the second valve needle 42 from being offset during the movement. The aperture of the second process hole 4112 is greater than or equal to the aperture of the second guide hole 4111, which can ensure that the aperture of the second guide hole 4111 meets the design requirements during processing, and ensure that the second valve needle 42 can be smoothly installed in the second guide hole 4111, and the second valve needle 42 can move freely in the second guide hole 4111.

[0069] The inner diameter of the second valve seat 41 at the fourth valve port 413 is larger than the aperture of the second process hole 4112, so that a step (not shown) is formed between the fourth valve port 413 and the second process hole 4112, and the second end cap 43 abuts against the step. Figure 6 , which is a schematic diagram of the structure of the second valve seat 41 when the second valve needle 42, the second elastic member 44 and the second sealing head 43 are not installed in the second valve seat 41. At this time, the side wall of the fourth valve port 413 of the second valve seat 41 is in a straight tube shape, which is convenient for sequentially installing the second valve needle 42, the second elastic member 44 and the second sealing head 43 into the second valve seat 41. Figure 1 The figure shows the structure of the two-way throttle valve after the second valve needle 42, the second elastic member 44 and the second head 43 are installed in the second valve seat 41; after the second valve needle 42, the second elastic member 44 and the second head 43 are installed in the second valve seat 41, the side wall at the fourth valve port 413 of the second valve seat 41 is squeezed to deform the side wall to form a cone structure, thereby blocking the second head 43, and completing the installation of the internal parts of the second valve seat 41. The second head 43 is T-shaped, the upper end of the T is fixed at the fourth valve port 413 and a gap is left between the second valve seat 41 for fluid to pass through; the lower end of the T is used to connect the second elastic member 44. In this embodiment, the second elastic member 44 is a compression spring, one end of which is sleeved on one end of the second head 43.

[0070] The second valve needle 42 includes a second needle body 421, a second needle 422 disposed at one end of the second needle body 421, and a second mounting portion 423 disposed at the other end of the second needle body 421. The second needle body 421 is columnar, the outer wall of the second needle body 421 is slidably matched with the inner wall of the second guide hole 4111, and the outer wall of the second needle body 421 is provided with a second fluid passage (not shown), so that the fluid can pass through the second fluid passage. The second needle 422 cooperates with the second valve port 313 to adjust the size of the flow area of ​​the third valve port 412. One end of the second elastic member 44 is sleeved on the outside of the second mounting portion 423.

[0071] The second valve seat 41 is further provided with a second silencing chamber 414, which is provided at one end of the third valve port 412 away from the second seat chamber 411 and communicated with the third valve port 412, and the inner diameter of the second silencing chamber 414 is larger than the inner diameter of the third valve port 412 and smaller than the inner diameter of the second seat chamber 411. One end of the second channel 24 is communicated with the second silencing chamber 414, and a second flared port 242 is provided at the connection between the second channel 24 and the second silencing chamber 414, and the inner diameter of the second flared port 242 gradually increases from one end close to the second channel 24 to one end close to the second silencing chamber 414. In this way, when the fluid in the second channel 24 flows to the second seat cavity 411, it passes through the second expansion port 242, the second silencer cavity 414 and the second valve port 313 in sequence, and finally enters the second seat cavity 411. Since the second silencer cavity 414 and the second expansion port 242 are provided, when the fluid flows from the second channel 24 to the second seat cavity 411, the inner diameter of the channel between the second channel 24 and the second seat cavity 411 (the second expansion port 242, the second silencer cavity 414 and the second valve port 313) changes relatively smoothly, and there will be no sudden increase or decrease, thereby reducing the noise generated by the fluid and achieving a silencing effect.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. A two-way throttle valve, It is characterized in that include: Valve pipe; a connecting piece, which is arranged in the valve tube and divides the interior of the valve tube into a first valve cavity and a second valve cavity, the connecting piece is provided with a first chamber, a second chamber, a first channel and a second channel, the first chamber is located at one end of the connecting piece close to the first valve cavity, the second chamber is located at one end of the connecting piece close to the second valve cavity, the first chamber and the second chamber are coaxially arranged along the axial direction of the connecting piece, the first channel connects the first chamber and the second valve cavity, and the second channel connects the second chamber and the first valve cavity; A first valve core assembly, disposed at the first chamber, for automatically adjusting the flow between the first channel and the first valve chamber; as well as A second valve core assembly is disposed at the second chamber and is used to automatically adjust the flow between the second channel and the second valve chamber; The first channel is configured as a linear channel inclined relative to the axial direction of the connecting member, the first channel has a first port connected to the outer wall of the connecting member, and the first channel is connected to the second valve chamber through the first port; The second channel is configured as a linear channel inclined relative to the axial direction of the connecting member, the second channel has a second port connected to the outer wall of the connecting member, and the second channel is connected to the first valve chamber through the second port; The first valve core assembly is provided with a first silencing chamber, one end of the first channel is connected to the first silencing chamber, and the cross section of the first silencing chamber is larger than the cross section of the first channel; The second valve core assembly is provided with a second silencing chamber, one end of the second channel is connected to the second silencing chamber, and the cross section of the second silencing chamber is larger than the cross section of the second channel; The connecting member comprises a first connecting section located in the first valve cavity, a first gap is formed between an outer wall of the first connecting section and an inner wall of the valve tube, and the second port is connected to the first gap; The connecting member includes a second connecting section located in the second valve cavity, a second gap is formed between the outer wall of the second connecting section and the inner wall of the valve tube, and the first port is connected to the second gap.

2. The two-way throttle valve according to claim 1, It is characterized in that The connecting piece is provided with a first annular groove at the first port of the first channel; And / or, the connecting member is provided with a second annular groove at the second end of the second channel.

3. The two-way throttle valve according to claim 1, It is characterized in that The connecting piece is in a columnar structure, and an annular outer boss is provided in the outer middle section of the connecting piece. One of the annular outer boss and the valve tube is provided with a limiting protrusion, and the other is provided with a limiting groove. The protrusion is adapted to the limiting groove to achieve a sealed connection between the connecting piece and the valve tube.

4. The two-way throttle valve according to claim 1, It is characterized in that The first chamber is located in the first connecting section, and the second channel has a second port connected to the outer wall of the first connecting section; And / or, the second chamber is located in the second connecting section, and the first channel has a first port connected to the outer wall of the second connecting section.

5. The two-way throttle valve according to claim 1, It is characterized in that The connecting piece, the first valve core assembly and the second valve core assembly are coaxially arranged.

6. The two-way throttle valve according to claim 1, It is characterized in that The first valve core assembly is welded to the connecting piece, the first chamber is configured as a stepped hole, and an end of the stepped hole with a larger aperture passes through an end surface of the connecting piece; And / or, the second valve core assembly is welded to the connecting piece, and the second chamber is configured as a stepped hole, and an end of the stepped hole with a larger aperture passes through the other end surface of the connecting piece.

7. The two-way throttle valve according to claim 1, It is characterized in that The first valve core assembly comprises: A first valve seat, comprising a first seat cavity, a first valve port and a second valve port, wherein the first valve port and the second valve port are respectively arranged at two ends of the first seat cavity and communicated with the first seat cavity, and the first valve port is arranged close to the first chamber; A first valve needle is movably disposed in the first seat cavity to adjust the flow area of ​​the first valve port; A first sealing head is disposed at the second valve port, a gap communicating with the first seat cavity and the first valve cavity being left between the first sealing head and the first valve seat; and The first elastic member has two ends respectively abutting against the first valve needle and the first sealing head, so that the first valve needle has a tendency to reduce the flow area of ​​the first valve port.

8. The two-way throttle valve according to claim 7, It is characterized in that The first seat cavity includes a first guide hole and a first process hole which are connected to each other. The first guide hole is arranged close to the first valve port, and the first process hole is arranged close to the second valve port. The aperture of the first process hole is greater than or equal to the aperture of the first guide hole.

9. The two-way throttle valve according to claim 7, It is characterized in that The first muffler cavity is disposed on the first valve seat, the first muffler cavity is disposed at one end of the first valve port away from the first seat cavity and is communicated with the first valve port, and the inner diameter of the first muffler cavity is larger than the inner diameter of the first valve port and smaller than the inner diameter of the first seat cavity; A first expansion port is provided at the connection point between the first channel and the first silencing cavity, and the inner diameter of the first expansion port gradually increases from one end close to the first channel to one end close to the first silencing cavity.

10. The two-way throttle valve according to claim 1, It is characterized in that The second valve core assembly comprises: A second valve seat, comprising a second seat cavity, a third valve port and a fourth valve port, wherein the third valve port and the fourth valve port are respectively arranged at two ends of the second seat cavity and communicate with the second seat cavity, and the third valve port is arranged close to the second cavity; A second valve needle is movably disposed in the second seat cavity to adjust the flow area of ​​the third valve port; A second sealing head is disposed at the fourth valve port, a gap communicating with the second seat cavity and the second valve cavity being left between the second sealing head and the second valve seat; and The second elastic member has two ends respectively abutting against the second valve needle and the second sealing head, so that the second valve needle has a tendency to reduce the flow area of ​​the third valve port.

11. The two-way throttle valve according to claim 10, It is characterized in that The second seat cavity includes a second guide hole and a second process hole which are connected to each other. The second guide hole is arranged close to the third valve port, the second process hole is arranged close to the fourth valve port, and the aperture of the second process hole is greater than or equal to the aperture of the second guide hole.

12. The two-way throttle valve according to claim 10, It is characterized in that The second muffler cavity is disposed on the second valve seat, the second muffler cavity is disposed at one end of the third valve port away from the second seat cavity and is communicated with the third valve port, and the inner diameter of the second muffler cavity is larger than the inner diameter of the third valve port and smaller than the inner diameter of the second seat cavity; A second flared opening is provided at the connection point between the second channel and the second silencing chamber, and an inner diameter of the second flared opening gradually increases from an end close to the second channel to an end close to the second silencing chamber.

Images