CN214146613U - Two-way expansion valve - Google Patents

Abstract

The application provides a two-way expansion valve, which comprises a valve seat, a valve body, a valve core mechanism and a regulating mechanism, wherein the valve seat is provided with a first joint and a second joint; the valve body is provided with a first flow passage, a second flow passage, a valve cavity, a first valve port and a second valve port; the first flow channel and the second flow channel are respectively communicated with the first joint and the second joint; the valve body is connected with the valve seat in a sliding way; the valve core mechanism is arranged in the valve cavity and used for alternatively opening the first valve port and the second valve port; the valve core mechanism is provided with a first throttling hole and a second throttling hole; the regulating mechanism is connected with the valve seat and the valve body simultaneously and is used for driving the valve body to slide relative to the valve seat so as to open the second throttling hole while opening the first valve port under the pressure of fluid, and therefore the first flow passage is communicated with the second flow passage through the second throttling hole; alternatively, the first orifice is opened while the second valve port is opened under the pressure of the fluid, so that the second flow passage communicates with the first flow passage through the first orifice. Bidirectional throttling can be realized, and the performance is good.

Description

Two-way expansion valve

Technical Field

The utility model relates to an air conditioning system field particularly, relates to a two-way expansion valve.

Background

The existing thermostatic expansion valve for the air conditioning system can meet the requirement of bidirectional flow, the expansion valve is provided with a first joint and a second joint, a valve core is arranged between the first joint and the second joint, and when the thermostatic expansion valve works, fluid can flow in from the first joint and flow to the second joint after a first valve port is opened, and fluid can also flow in from the second joint and flow to the first joint after a second valve port is opened.

The inventor researches and discovers that the prior thermostatic expansion valve has the following defects:

bidirectional throttling cannot be achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two-way expansion valve, it can realize two-way throttle step-down, and the performance is better, and work is more reliable and more stable.

The embodiment of the utility model is realized like this:

the utility model provides a two-way expansion valve, include:

the valve seat is provided with a first connector and a second connector;

the valve body is provided with a first flow passage, a second flow passage, a valve cavity, a first valve port and a second valve port, the first flow passage can be communicated with the valve cavity through the first valve port, and the second flow passage can be communicated with the valve cavity through the second valve port; the first flow channel and the second flow channel are respectively communicated with the first joint and the second joint; the valve body is connected with the valve seat in a sliding way;

the valve core mechanism is arranged in the valve cavity and used for alternatively opening the first valve port and the second valve port; the valve core mechanism is provided with a first throttling hole and a second throttling hole which can be communicated with the valve cavity;

the regulating mechanism is connected with the valve seat and the valve body at the same time and is used for driving the valve body to slide relative to the valve seat so as to open the second throttling hole while the first valve port is opened under the pressure of fluid, and therefore the first flow passage, the first valve port, the valve cavity, the second throttling hole and the second flow passage are communicated in sequence; alternatively, the first orifice is opened while the second valve port is opened under the pressure of the fluid, so that the second flow passage, the second valve port, the valve chamber, the first orifice, and the first flow passage are communicated in this order.

In an alternative embodiment, the spool mechanism includes a first spool, a second spool, and a first resilient member;

the first valve core is arranged in the valve cavity and is matched with the valve body in a sliding way for opening or closing the first valve port; the first throttling hole is formed in the first valve core; the second valve core is arranged in the valve cavity and is matched with the valve body in a sliding way for opening or closing the second valve port; the second throttling hole is formed in the second valve core; the first elastic element is arranged in the valve cavity and used for enabling the first valve core to have a movement trend of closing the first valve port and enabling the second valve core to have a movement trend of closing the second valve port.

In an alternative embodiment, the valve core mechanism further comprises a first blocking ball, a second blocking ball and a second elastic member, wherein the first blocking ball and the second blocking ball are movably connected with the valve core, the first blocking ball is used for opening or closing the first orifice, the second blocking ball is used for opening or closing the second orifice, and the second elastic member is arranged in the valve cavity and is used for enabling the first blocking ball to have a movement tendency for closing the first orifice and enabling the second blocking ball to have a movement tendency for closing the second orifice;

the regulating mechanism is used for driving the valve body to move relative to the first blocking ball to open the first throttling hole or used for driving the valve body to move relative to the second blocking ball to open the second throttling hole.

In an alternative embodiment, the regulating mechanism includes a linear driving structure, a first valve needle and a second valve needle, both of which are connected to the valve seat, the linear driving structure is disposed on the valve seat, and the linear driving structure is connected to the valve body and configured to drive the valve body to slide in a first direction relative to the valve seat, so that the second blocking ball abuts against the second valve needle, and thus the second blocking ball opens the second orifice, or to drive the valve body to slide in a second direction opposite to the first direction relative to the valve seat, and thus the first blocking ball abuts against the first valve needle, and thus the first blocking ball opens the first orifice.

In an alternative embodiment, the linear driving structure comprises a motor and a screw rod, the motor is connected with the valve seat, the screw rod is in threaded connection with an output shaft of the motor, and the screw rod and the valve seat are relatively fixed in the circumferential direction of the screw rod, so that when the output shaft rotates, the screw rod reciprocates in the extension direction of the screw rod; one end of the screw rod, which is far away from the motor, is connected with the valve body.

In an optional embodiment, the adjusting mechanism further includes a rotation stopping seat, the rotation stopping seat is fixedly connected to the valve seat, the screw rod penetrates through the rotation stopping seat, the screw rod is slidably connected to the rotation stopping seat, and the screw rod and the rotation stopping seat are relatively fixed in the circumferential direction of the screw rod.

In an optional embodiment, the regulating mechanism further comprises a rotation stopping slide block and a third elastic piece; a first sliding groove is formed in one end, away from the motor, of the screw rod, a second sliding groove is formed in the rotation stopping seat, and the rotation stopping sliding block is embedded in the first sliding groove and the second sliding groove at the same time, so that the screw rod and the rotation stopping seat are relatively fixed in the circumferential direction of the screw rod; the rotation stopping slide block is matched with the first sliding groove and the second sliding groove in a sliding manner in the extending direction of the screw rod;

the third elastic piece is arranged between the valve body and the rotation stopping slide block and is used for enabling the rotation stopping slide block to be always kept in a state of being abutted against the rotation stopping seat;

the first valve needle is fixedly connected with the rotation stopping slide block, and the first valve needle protrudes out of the groove opening of the sliding groove along the extending direction of the screw rod.

In an alternative embodiment, the third resilient member is disposed over the first valve needle.

In alternative embodiments, the linear telescopic structure is a cylinder, a hydraulic cylinder or an electric push rod.

In an alternative embodiment, the regulating mechanism further comprises a mounting seat, the mounting seat being detachably connected with the valve seat, the second valve needle being connected with the mounting seat.

The embodiment of the utility model provides a beneficial effect is:

in summary, in the bidirectional expansion valve provided in this embodiment, when fluid enters from the first joint, the fluid pushes the valve core mechanism to move, so that the first valve port is opened, and the fluid enters into the valve chamber from the first valve port. Meanwhile, the regulating mechanism is operated to open the second throttle hole, and the fluid flows from the second throttle hole to the second flow passage to realize throttling. And, fluid can enter the second joint from the second flow passage and exit the second joint. Similarly, when fluid enters from the second joint, the fluid pushes the valve core mechanism to move reversely, the second valve port is opened, the fluid enters the valve cavity from the second valve port, meanwhile, the regulating mechanism is operated, the first throttling hole is opened, and the fluid enters the first flow channel through the first throttling hole, so that throttling is realized. Fluid can enter the first connector from the first flow passage and exit the first connector. That is, no matter the fluid flows from the first joint to the second joint or from the second joint to the first joint, the fluid needs to pass through the throttling hole, the throttling and pressure reduction can be carried out on the fluid in the bidirectional flowing process, the performance of the expansion valve is good, and the operation is stable and reliable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a bidirectional expansion valve according to an embodiment of the present invention;

fig. 2 is a schematic view of the valve body and the valve core mechanism according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first state of the bidirectional expansion valve according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of another state of the bidirectional expansion valve according to the embodiment of the present invention;

fig. 5 is a schematic view of a partial structure of a bidirectional expansion valve according to an embodiment of the present invention.

Icon:

100-valve seat; 110-a first joint; 120-a second linker; 130-a mounting cavity; 200-a valve body; 210-a first flow channel; 220-a second flow channel; 230-a valve cavity; 240-first valve port; 250-a second valve port; 300-a valve core mechanism; 310-a first valve spool; 311-first orifice; 320-a second valve core; 321-a second orifice; 330-a first elastic member; 340-a first blocking ball; 350-a second plugging ball; 360-a second elastic member; 400-a regulating mechanism; 410-a linear drive mechanism; 411-motor; 412-a lead screw; 4121-a first runner; 420-a first valve needle; 430-a second valve needle; 440-stop rotation; 441-a second chute; 450-rotation stopping slide block; 460-a third resilient member; 470-mounting seat.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the following examples, the first direction is the direction indicated by the ab arrow and the second direction is the direction indicated by the ba arrow unless otherwise specified.

Referring to fig. 1-5, the present embodiment provides a bidirectional expansion valve, which can achieve both-way adjustable throttling and pressure reducing functions, and has good working performance and wide application range.

Referring to fig. 1, in the present embodiment, the bidirectional expansion valve includes:

a valve seat 100, the valve seat 100 being provided with a first joint 110 and a second joint 120;

the valve comprises a valve body 200, wherein the valve body 200 is provided with a first flow passage 210, a second flow passage 220, a valve cavity 230, a first valve port 240 and a second valve port 250, the first flow passage 210 can be communicated with the valve cavity 230 through the first valve port 240, and the second flow passage 220 can be communicated with the valve cavity 230 through the second valve port 250; the first flow passage 210 and the second flow passage communicate with the first joint 110 and the second joint 120, respectively; the valve body 200 is slidably coupled with the valve seat 100;

a spool mechanism 300, provided in the valve chamber 230, for alternatively opening the first valve port 240 and the second valve port 250; the valve body mechanism 300 is provided with a first orifice 311 and a second orifice 321 which can communicate with the valve chamber 230;

and a regulation mechanism 400, the regulation mechanism 400 being connected to both the valve seat 100 and the valve body 200, for driving the valve body 200 to slide relative to the valve seat 100, so that the first port 240 is opened under the pressure of the fluid and the second orifice 321 is opened, thereby sequentially communicating the first flow passage 210, the first port 240, the valve chamber 230, the second orifice 321, and the second flow passage 220; alternatively, the first orifice 311 is opened while the second valve port 250 is opened under the pressure of the fluid, so that the second flow passage 220, the second valve port 250, the valve chamber 230, the first orifice 311, and the first flow passage 210 are communicated in order.

Referring to fig. 3, a plurality of arrows indicate a flowing direction of a fluid. In use, when fluid enters from the first joint 110, the valve core mechanism 300 slides in a first direction relative to the valve body 200 under the pressure of the fluid, the valve core mechanism 300 moves away from the first port 240, so that the first port 240 is opened, and the fluid enters the valve chamber 230 from the first port 240. Meanwhile, when the regulating mechanism 400 is operated to open the second throttle hole 321, the fluid in the valve chamber 230 does not flow out directly from the second valve port 250, but flows from the second throttle hole 321 to the second flow passage 220, so that throttling is realized. Also, fluid can enter the second connector 120 from the second flow passage 220 and exit the second connector 120.

Referring to fig. 4, wherein a plurality of arrows indicate the flowing direction of the fluid, similarly, when the fluid enters from the second joint 120, the fluid pushes the valve core mechanism 300 to slide relative to the valve body 200 in a second direction opposite to the first direction, the valve core mechanism 300 is away from the second valve port 250 and forms a gap between the valve core mechanism 300 and the second valve port 250 to open the second valve port 250, and the fluid enters from the second valve port 250 into the valve chamber 230. Meanwhile, the regulating mechanism 400 is operated to open the first throttle hole 311, and the fluid in the valve chamber 230 does not directly flow out from the first valve port 240, but enters the first flow channel 210 through the first throttle hole 311, so as to realize throttling. Fluid can enter the first connector 110 from the first flow channel 210 and exit the first connector 110.

In other words, in the two-way expansion valve provided by the present embodiment, no matter the fluid flows from the first joint 110 to the second joint 120 or from the second joint 120 to the first joint 110, the fluid needs to pass through the orifice, and the fluid can be throttled and depressurized during the two-way flow, so that the expansion valve has good performance and stable and reliable operation. Meanwhile, when the regulating mechanism 400 drives the first throttle hole 311 and the second throttle hole 321 to be opened, the opening degrees of the first throttle hole 311 and the second throttle hole 321 can be regulated according to actual working conditions, so that the functions of regulating, throttling and reducing pressure are achieved, and the use is more flexible.

Referring to fig. 2, in the present embodiment, the valve core mechanism 300 optionally includes a first valve core 310, a second valve core 320, a first elastic member 330, a first blocking ball 340, a second blocking ball 350, and a second elastic member 360. The first valve spool 310, the first blocking ball 340, the second blocking ball 350, and the second valve spool 320 are sequentially arranged in the first direction, that is, the first valve spool 310 is located at the rear end in the first direction, and the second valve spool 320 is located at the front end in the first direction. The first valve core 310 and the second valve core 320 are both arranged in the valve cavity 230 and are slidably matched with the valve cavity 230, and the first valve core 310 is used for opening or closing the first valve port 240; the second valve spool 320 is used to open or close the second valve port 250. The first elastic member 330 is disposed between the first valve spool 310 and the second valve spool 320 and abuts against the first valve spool 310 and the second valve spool 320, so that the first valve spool 310 tends to move in the second direction to close the first valve port 240, and the second valve spool 320 tends to move in the first direction to close the second valve port 250. In operation, when fluid flows in from the first joint 110, the first valve spool 310 moves in a first direction under the pressure of the fluid, and the first valve spool 310 can open the first port 240; when the fluid input is stopped, the first valve spool 310 is reset to close the first valve port 240 by the first elastic member 330. Similarly, the second valve core 320 can open the second valve port 250 under the pressure of the fluid input from the second connector 120, and when the fluid input is stopped, the second valve port 250 is closed by the first elastic member 330.

Furthermore, a first throttle hole 311 is formed at one end of the first valve spool 310 away from the second valve spool 320, and both the first throttle hole 311 and the first valve port 240 are tapered holes. The first blocking ball 340 is a steel ball, and the first blocking ball 340 is used for opening or closing the first throttle hole 311. The end of the second spool 320 remote from the first spool 310 is provided with a second orifice 321, and both the second orifice 321 and the second port 250 are tapered holes. The second blocking ball 350 is a steel ball, and the second blocking ball 350 is used to open or close the second orifice 321.

The second elastic member 360 is disposed between the first blocking ball 340 and the second blocking ball 350, and is configured to simultaneously abut against the first blocking ball 340 and the second blocking ball 350, so that the first blocking ball 340 has a tendency to move in the second direction to close the first throttle hole 311, and the second blocking ball 350 has a tendency to move in the first direction to close the second throttle hole 321.

It should be noted that the first elastic member 330 and the second elastic member 360 may be provided as springs. Optionally, the first elastic member 330 is sleeved outside the second elastic member 360.

Obviously, in other embodiments, the first elastic member 330 and the second elastic member 360 may also be rubber members or the like.

Further, the regulation mechanism 400 is used to drive the valve body 200 to move relative to the first blocking ball 340 to open the first orifice 311, or to drive the valve body 200 to move relative to the second blocking ball 350 to open the second orifice 321. In the present embodiment, the regulation mechanism 400 is used to drive the valve body 200 to move in the first direction to open the second throttle hole 321, and is used to drive the valve body 200 to move in the second direction to open the first throttle hole 311.

In this embodiment, optionally, the valve seat 100 is provided with a mounting cavity 130 which is simultaneously connected with the first joint 110 and the second joint 120, the mounting cavity 130 is a strip-shaped cavity, the mounting cavity 130 extends along a first direction, and the valve body 200 is disposed in the mounting cavity 130 and slidably engaged with the valve seat 100 along the extending direction of the mounting cavity 130. As the valve body 200 slides relative to the valve seat 100, the valve body 200 can drive the poppet mechanism 300 to move together.

Referring to fig. 1 and 5, in the present embodiment, optionally, the regulating mechanism 400 includes a linear driving structure, a first valve needle 420 and a second valve needle 430, the first valve needle 420 and the second valve needle 430 are both connected to the valve seat 100, the first valve needle 420 and the second valve needle 430 are respectively located at two ends of the mounting cavity 130, and the first valve needle 420 is disposed near the first valve element 310, and the second valve needle 430 is disposed near the second valve element 320. The linear driving structure is disposed on the valve seat 100, and a portion of the linear driving structure extends into the mounting cavity 130 and is connected to the valve body 200, and is used for driving the valve body 200 to slide in a first direction relative to the valve seat 100, so that the second blocking ball 350 abuts against the second valve needle 430, so that the second blocking ball 350 opens the second orifice 321, or for driving the valve body 200 to slide in a second direction opposite to the first direction relative to the valve seat 100, so that the first blocking ball 340 abuts against the first valve needle 420, so that the first blocking ball 340 opens the first orifice 311.

Further, the linear driving mechanism 410 includes a motor 411 and a lead screw 412, the motor 411 is connected with the valve seat 100, the lead screw 412 is in threaded connection with an output shaft of the motor 411, and the lead screw 412 and the valve seat 100 are relatively fixed in the circumferential direction of the lead screw 412, so that when the output shaft rotates, the lead screw 412 reciprocates in the extending direction thereof; the end of the screw 412 far away from the motor 411 is connected with the valve body 200. The screw 412 is driven by the motor 411 to move in the first direction or the second direction, so as to drive the valve body 200 to move in the first direction or the second direction.

Optionally, the screw 412 and the valve body 200 may be detachably connected through a snap structure, which is convenient for detachment, maintenance or replacement.

Further, the linear driving mechanism 410 further includes a rotation stop block 440, a rotation stop slider 450 and a third elastic element 460, the rotation stop block 440 is fixedly connected to the valve seat 100, the screw 412 penetrates through the rotation stop block 440, the screw 412 is slidably connected to the rotation stop block 440, and the screw 412 and the rotation stop block 440 are relatively fixed in the circumferential direction of the screw 412. A first sliding groove 4121 is formed in one end of the screw rod 412, which is far away from the motor 411, a second sliding groove 441 is formed in the rotation stopping seat 440, and the rotation stopping slider 450 is embedded in the first sliding groove 4121 and the second sliding groove 441 at the same time, so that the screw rod 412 and the rotation stopping seat 440 are relatively fixed in the circumferential direction of the screw rod 412; the rotation stop slider 450 is slidably engaged with the first slide groove 4121 and the second slide groove 441 in the extending direction of the screw 412; the third elastic element 460 is disposed between the valve body 200 and the rotation stop slider 450, and is used for keeping the rotation stop slider 450 in a state of being abutted against the rotation stop seat 440 all the time; the first valve needle 420 is fixedly connected with the rotation stopping slider 450, and the first valve needle 420 protrudes out of the slot of the sliding chute along the extending direction of the screw 412.

Optionally, the third elastic element 460 is configured as a spring, the third elastic element 460 is sleeved outside the first valve needle 420, the first valve needle 420 plays a role in guiding the third elastic element 460, the position of the third elastic element 460 is more stable, and the elastic force is more stable.

Alternatively, the second valve needle 430 may be detachably connected to the valve seat 100 through the mounting seat 470, for example, the mounting seat 470 may be screwed to the valve seat 100, and the distance between the second valve needle 430 and the second blocking ball 350 may also be adjusted by screwing the mounting seat 470, so as to improve the control accuracy of the adjustment of the opening degree of the second throttle hole 321.

In other embodiments, the linear telescopic mechanism can be a pneumatic cylinder, a hydraulic cylinder, an electric push rod or the like.

The bidirectional expansion valve provided by the embodiment can realize bidirectional throttling and pressure reduction, can adjust the throttling and pressure reduction degree as required, and is more reliable in regulation and control and higher in performance.

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

Claims (10)

1. A bi-directional expansion valve, comprising:

the valve seat is provided with a first connector and a second connector;

the valve comprises a valve body, a first flow passage, a second flow passage, a valve cavity, a first valve port and a second valve port, wherein the first flow passage can be communicated with the valve cavity through the first valve port, and the second flow passage can be communicated with the valve cavity through the second valve port; the first flow passage and the second flow passage are respectively communicated with the first joint and the second joint; the valve body is connected with the valve seat in a sliding way;

the valve core mechanism is arranged in the valve cavity and used for alternatively opening the first valve port and the second valve port; the valve core mechanism is provided with a first throttling hole and a second throttling hole which can be communicated with the valve cavity;

the regulating mechanism is connected with the valve seat and the valve body at the same time and is used for driving the valve body to slide relative to the valve seat so as to open the first valve port and the second throttling hole at the same time under the pressure of fluid, and therefore the first flow passage, the first valve port, the valve cavity, the second throttling hole and the second flow passage are communicated in sequence; or, the second valve port is opened under the pressure of the fluid, and the first throttle hole is opened, so that the second flow passage, the second valve port, the valve chamber, the first throttle hole and the first flow passage are communicated in sequence.

2. The two-way expansion valve of claim 1, wherein:

the valve core mechanism comprises a first valve core, a second valve core and a first elastic piece;

the first valve core is arranged in the valve cavity and is matched with the valve body in a sliding way, and the first valve core is used for opening or closing the first valve port; the first throttle hole is arranged on the first valve core; the second valve core is arranged in the valve cavity and is matched with the valve body in a sliding way, and the second valve port is opened or closed; the second throttle hole is formed in the second valve core; the first elastic piece is arranged in the valve cavity and used for enabling the first valve core to have a movement tendency of closing the first valve port and enabling the second valve core to have a movement tendency of closing the second valve port.

3. The two-way expansion valve of claim 2, wherein:

the valve core mechanism further comprises a first blocking ball, a second blocking ball and a second elastic piece, the first blocking ball and the second blocking ball are movably connected with the valve core, the first blocking ball is used for opening or closing the first orifice, the second blocking ball is used for opening or closing the second orifice, and the second elastic piece is arranged in the valve cavity and used for enabling the first blocking ball to have a movement trend of closing the first orifice and enabling the second blocking ball to have a movement trend of closing the second orifice;

the regulating mechanism is used for driving the valve body to move relative to the first blocking ball to open the first throttling hole, or is used for driving the valve body to move relative to the second blocking ball to open the second throttling hole.

4. A two-way expansion valve according to claim 3, wherein:

the regulating mechanism comprises a linear driving structure, a first valve needle and a second valve needle, the first valve needle and the second valve needle are connected with the valve seat, the linear driving structure is arranged on the valve seat and connected with the valve body and used for driving the valve body to slide relative to the valve seat in a first direction so as to enable the second blocking ball to be abutted against the second valve needle, and therefore the second blocking ball opens the second throttling hole, or the linear driving structure is used for driving the valve body to slide relative to the valve seat in a second direction opposite to the first direction so as to enable the first blocking ball to be abutted against the first valve needle, and therefore the first blocking ball opens the first throttling hole.

5. The two-way expansion valve of claim 4, wherein:

the linear driving structure comprises a motor and a screw rod, the motor is connected with the valve seat, the screw rod is in threaded connection with an output shaft of the motor, and the screw rod and the valve seat are relatively fixed in the circumferential direction of the screw rod, so that when the output shaft rotates, the screw rod reciprocates in the extension direction of the output shaft; and one end of the screw rod, which is far away from the motor, is connected with the valve body.

6. The two-way expansion valve of claim 5, wherein:

the regulating mechanism further comprises a rotation stopping seat, the rotation stopping seat is fixedly connected with the valve seat, the screw rod penetrates through the rotation stopping seat, the screw rod is connected with the rotation stopping seat in a sliding mode, and the screw rod is relatively fixed with the rotation stopping seat in the circumferential direction of the screw rod.

7. The two-way expansion valve of claim 6, wherein:

the regulating mechanism further comprises a rotation stopping sliding block and a third elastic piece; a first sliding groove is formed in one end, far away from the motor, of the screw rod, a second sliding groove is formed in the rotation stopping seat, and the rotation stopping sliding block is embedded in the first sliding groove and the second sliding groove at the same time, so that the screw rod and the rotation stopping seat are relatively fixed in the circumferential direction of the screw rod; the rotation stopping sliding block is matched with the first sliding groove and the second sliding groove in a sliding mode in the extending direction of the screw rod;

the third elastic piece is arranged between the valve body and the rotation stopping slide block and is used for enabling the rotation stopping slide block to be always kept in a state of abutting against the rotation stopping seat;

the first valve needle is fixedly connected with the rotation stopping sliding block, and the first valve needle protrudes out of the groove opening of the sliding groove along the extending direction of the screw rod.

8. The two-way expansion valve of claim 7, wherein:

the third elastic piece is sleeved outside the first valve needle.

9. The two-way expansion valve of claim 4, wherein:

the linear telescopic structure is a cylinder, a hydraulic cylinder or an electric push rod.

10. The two-way expansion valve of claim 4, wherein:

the regulating mechanism further comprises a mounting seat, the mounting seat is detachably connected with the valve seat, and the second valve needle is connected with the mounting seat.

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