An expansion valve

Abstract

An expansion valve comprises a valve core and a valve shell, the valve shell is provided with a valve cavity, a valve hole, an inlet flow channel and an outlet flow channel, the inlet flow channel and the outlet flow channel are communicated with a flow area, the valve core is slidingly inserted into the valve hole, further comprising a switching assembly, an electromagnetic coil arranged in the valve cavity and an armature located in the electromagnetic coil, the switching assembly is detachably connected between the armature and the valve core, the valve core comprises a blocking end inserted into the flow area and an adjusting end inserted into the valve cavity, the valve cavity is provided with a first spring abutting to the valve core and a second spring abutting to the armature, the first spring is used for pushing the valve core away from the flow area, the second spring is used for pushing the armature to move towards the valve hole direction to drive the valve core to approach the flow area, and the valve core is provided with an intermediate hole communicating the flow area and the valve cavity. The above scheme realizes accurate and stable driving of the valve core through magnetic force, effectively reduces the wear problem, increases the service life, and has good practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valve body, in particular to an expansion valve. BACKGROUND

[0002] The expansion valve as one of the four components of the refrigeration system, mainly plays the role of throttling and regulating flow. Referring to the patent with the publication number CN105333203A, it mainly uses a stepper motor to generate rotary motion, and the rotary motion further realizes the axial action of the valve core through a threaded transmission mechanism, so as to adjust the flow area of the valve port and realize the function of flow control.

[0003] It can be seen from the patent that the structure of the expansion valve is very complex, and the corresponding processing and assembly cost is relatively high. At the same time, due to the wear of the threaded transmission mechanism, after long-term use, problems such as transmission jamming and valve core movement out of position are prone to occur. SUMMARY

[0004] The purpose of the present application is to provide an expansion valve with convenient and stable flow control and long service life.

[0005] In order to solve the above problems, the present application provides an expansion valve, which comprises a valve core and a valve shell, the valve shell is provided with a valve cavity, a valve hole, an inlet flow channel and an outlet flow channel, the inlet flow channel and the outlet flow channel are communicated with a flow area, one end of the valve hole is communicated with the flow area and the other end is communicated with the valve cavity, the valve core is slidably inserted into the valve hole, further comprising an adapter assembly, an electromagnetic coil arranged in the valve cavity and an armature located in the electromagnetic coil, the electromagnetic coil is used to drive the armature to move along the axial direction, the adapter assembly is detachably connected between the armature and the valve core, the valve core comprises a blocking end inserted into the flow area and an adjusting end inserted into the valve cavity, the valve cavity is provided with a first spring abutting to the valve core and a second spring abutting to the armature, the first spring is used to push the valve core away from the flow area, the second spring is used to push the armature to move towards the valve hole direction to drive the valve core to approach the flow area, and the valve core is provided with an intermediate hole communicating the flow area and the valve cavity.

[0006] The scheme generates a controllable magnetic field by the setting of the electromagnetic coil, so that the armature can move relative to the electromagnetic coil under the magnetic force of the magnetic field, and then the armature drives the adapter assembly to move, and finally the axial sliding distance of the valve core relative to the valve hole is controlled, that is, the precise adjustment of the on-off state of the flow area is realized; at the same time, the setting of the first spring ensures that the valve core, the adapter assembly and the armature can be stably connected, and the setting of the second spring makes the armature be pushed to one side of the valve hole when the electromagnetic coil loses power, that is, the blocking end of the valve core can be moved towards the flow area. In addition, the setting of the intermediate hole balances the internal pressure of the valve cavity with the flow area, thereby effectively reducing the problem of unstable control of the valve core caused by pressure sudden change when the valve core switches the flow area, facilitating the precise control of the valve core. Compared with the prior art, the above scheme realizes the precise and stable driving of the valve core by magnetic force, effectively reduces the wear problem, increases the service life, and has good practicability.

[0007] As preferred, a cylindrical iron core is further included, which is connected to the inner side of the electromagnetic coil, and an opening is arranged on the side of the iron core facing the valve hole, and the armature is slidably connected to the inner side of the iron core, and a slanted groove is arranged on the side wall of the iron core to form a proportional electromagnet composed of the armature, the iron core and the electromagnetic coil, so that the magnetic force acting on the armature and the moving distance are in a linear relationship, facilitating the accurate control of the position of the valve core.

[0008] As preferred, the armature is provided with a plurality of flow guide holes, one end of each of which penetrates to the side of the armature close to the valve core and the other end of which penetrates to the side of the armature away from the valve core, so that on the one hand, the fluid can flow to both sides of the armature through the flow guide holes to achieve pressure balance, improving the running stability and accuracy of the armature; on the other hand, by designing the number or aperture of the flow guide holes, the damping force acting on the armature during movement can be changed to adapt to different working conditions.

[0009] As preferred, the adapter assembly includes a push rod and a cap, the intermediate hole includes a first hole section penetrating along the axial direction of the valve core and a second hole section arranged along the radial direction of the valve core, the second hole section communicates the first hole section and the valve cavity, the cap is connected to one end of the first hole section away from the flow area, and the push rod abuts between the armature and the cap, so that not only the machining difficulty of the valve core and the overall assembly difficulty are effectively reduced, but also the transmission of the acting force between the armature and the valve core is more stable by the setting of the adapter assembly, reducing the coaxiality requirement between the armature and the valve core; in addition, the vertical arrangement of the second hole section relative to the first hole section enables the fluid flowing from the flow area into the intermediate hole to flow more smoothly into the valve cavity.

[0010] As preferred, one side of the armature facing the valve core is provided with a mounting groove, and the end of the push rod is clamped in the mounting groove, and the push rod is made of non-magnetic material, which on one hand facilitates the assembly between the push rod and the armature, and on the other hand effectively avoids the leakage of the magnetic field of the armature.

[0011] As preferred, the side of the cap is provided with a raised cap edge, and the adjusting end of the valve core is provided with an axial sink, and the cap edge leaves an axial gap relative to the sink, so that the assembly error between the armature, the push rod and the valve core can be effectively compensated by adjusting the axial position of the cap relative to the first hole section, and the adjustment is simple and convenient.

[0012] As preferred, the hole diameter of the first hole section near one end of the flow passage is smaller than the hole diameter of the first hole section far from the flow passage, so that on one hand the fluid flowing into the first hole section from the flow passage can be effectively slowed down to avoid the unstable situation caused by the sudden change of the pressure in the valve cavity, and on the other hand the damping force when the valve core moves can be changed by designing the hole diameter of the first hole section near the flow passage, so as to adapt to different working conditions.

[0013] As preferred, the above scheme further includes a plug, the valve housing is provided with a mounting hole communicating with the valve cavity, and the plug is adjustably inserted into the mounting hole and makes the armature located between the plug and the adapter assembly, and the second spring abuts between the plug and the armature, so that the pre-tightening force of the second spring on the armature in the initial state can be changed by adjusting the axial position of the plug relative to the mounting hole, thereby avoiding the situation that the pre-tightening force of the second spring does not meet the requirements due to assembly error or different working conditions, and the robustness is high.

[0014] As preferred, the second spring is used to push the blocking end to close the flow passage when the electromagnetic coil loses power, so as to ensure that even if the electromagnetic coil loses power due to accident, the blocking end can still close the flow passage under the action of the second spring, that is, the valve core can keep the flow passage in the normally closed state, and the safety hazard is reduced.

[0015] As preferred, the inlet flow channel is arranged radially relative to the valve core, and the outlet flow channel is arranged axially relative to the valve core, so that when the adjusting end of the valve core closes the flow passage, the fluid of the inlet flow channel can be blocked outside the middle hole without affecting the inside of the valve cavity.

[0016] As preferred, the outer side of the valve core is provided with a plurality of balance grooves distributed axially, the balance grooves are arranged circumferentially around the valve core, and the balance grooves are located inside the valve hole, so that the sliding of the valve core relative to the valve hole is more stable, and the valve core can be automatically centered relative to the valve hole, and the coaxiality is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is a front view of an expansion valve;

[0018] Figure 2 It is a view along Figure 1 the section line A-A;

[0019] Figure 3 It is a view along Figure 2 the section line B-B;

[0020] Figure 4 It is a view along Figure 2 the section line C-C;

[0021] Figure 5 It is a view along Figure 4 the section line D;

[0022] Explanation of reference signs:

[0023] a1, valve housing; a11, valve cavity; a12, valve hole; a13, inlet flow passage; a14, outlet flow passage; a15, flow area; a2, first spring; a3, second spring; a4, plug;

[0024] b1, valve core; b2, intermediate hole; b21, first hole section; b22, second hole section; b3, sink groove; b4, balance groove;

[0025] c1, electromagnetic coil; c2, armature; c21, flow guide hole; c22, mounting groove; c3, iron core; c31, inclined groove;

[0026] d1, push rod; d2, cap; d21, cap edge. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, it should be noted that all directional indications (such as up, down, left, right, front, back, inside, outside) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0028] Please refer to Figures 1-5The embodiment of the present application provides an expansion valve, which comprises a valve core b1 and a valve shell a1, the valve shell a1 is provided with a valve cavity a11, a valve hole a12, an inlet flow channel a13 and an outlet flow channel a14, the inlet flow channel a13 and the outlet flow channel a14 are communicated with a flow area a15, one end of the valve hole a12 is communicated with the flow area a15 and the other end is communicated with the valve cavity a11, the valve core b1 is slidably inserted into the valve hole a12, further comprising an adapter assembly, an electromagnetic coil c1 arranged in the valve cavity a11 and an armature c2 arranged in the electromagnetic coil c1, the electromagnetic coil c1 is used for driving the armature c2 to move in the axial direction, the adapter assembly is detachably connected between the armature c2 and the valve core b1, the valve core b1 comprises a blocking end inserted into the flow area a15 and an adjusting end inserted into the valve cavity a11, the valve cavity a11 is provided with a first spring a2 abutting against the valve core b1 and a second spring a3 abutting against the armature c2, the first spring a2 is used for pushing the valve core b1 away from the flow area a15, the second spring a3 is used for pushing the armature c2 to move towards the valve hole a12 so as to drive the valve core b1 to be close to the flow area a15, and the valve core b1 is provided with an intermediate hole b2 connected with the flow area a15 and the valve cavity a11.

[0029] It should be understood that the valve cavity a11 in the embodiment refers to an area that can be used for containing inside the valve shell a1, and the valve cavity a11 can be an integrated structure formed after welding or a split structure formed after clamping as shown in the drawings, and the design is not limited thereto. Figure 3

[0030] The above scheme generates a controllable magnetic field through the arrangement of the electromagnetic coil c1, so that the armature c2 can move relative to the electromagnetic coil c1 under the magnetic force of the magnetic field, and then the armature c2 drives the movement of the adapter assembly, and finally the axial sliding distance of the valve core b1 relative to the valve hole a12 is controlled, that is, the precise adjustment of the on-off state of the flow area a15 is realized; meanwhile, the arrangement of the first spring a2 ensures that the valve core b1, the adapter assembly and the armature c2 can be stably connected, and the arrangement of the second spring a3 makes the armature c2 be pushed to one side of the valve hole a12 when the electromagnetic coil c1 loses power, that is, the blocking end of the valve core b1 can be moved towards the flow area a15. In addition, the arrangement of the intermediate hole b2 balances the internal pressure of the valve cavity a11 and the flow area a15, thereby effectively reducing the problem that the valve core b1 is unstable in control due to pressure sudden change when the valve core b1 switches the flow area a15, and facilitating the precise control of the valve core b1. Compared with the prior art, the above scheme realizes the precise and stable driving of the valve core b1 through magnetic force, effectively reduces the wear problem, increases the service life, and has good practicability.

[0031] ​In a preferred use mode, the second spring a3 is arranged to push the armature c2 when the electromagnetic coil c1 loses power, and the pushing force of the second spring a3 is just enough to make the blocking end of the valve core b1 completely close the flow area a15, so as to ensure that even if the electromagnetic coil c1 loses power due to an accident, the blocking end can still close the flow area a15 under the action of the second spring a3, that is, the valve core b1 can keep the flow area a15 in a normally closed state, reducing the safety hazard; when it is needed to open the flow area a15, only the electromagnetic coil c1 needs to be powered, so that the armature c2 moves away from the valve hole a12 under the action of the magnetic field of the electromagnetic coil c1, and the valve core b1 can be separated from the flow area a15 under the action of the first spring a2, that is, the flow area a15 becomes an open state.

[0032] In the embodiment, a cylindrical yoke c3 is further included, the yoke c3 is inserted into the inner side of the electromagnetic coil c1, the side of the yoke c3 facing the valve hole is provided with an opening and the armature is slidably connected to the inner side of the yoke, and the side wall of the yoke c3 is provided with a slanted groove c31, so that the armature c2, the yoke c3 and the electromagnetic coil c1 form a proportional electromagnet, so that the magnetic force acting on the armature c2 and the moving distance are in a linear relationship, facilitating accurate control of the position of the valve core b1. In the embodiment, the armature c2 is made of a magnetic conductive material and is preferably cylindrical, and the valve housing a1 is also made of a magnetic conductive material; when it is needed to move the armature c2 towards the valve hole a12, the electromagnetic coil c1 is powered to magnetize the armature c2 and the yoke c3, and then the armature c2 moves axially under the magnetic force of the yoke c3. It should be noted that in other embodiments, the armature c2 can also be directly made of a permanent magnetic material, so as to be directly driven by the magnetic field generated by the electromagnetic coil c1.

[0033] Further, the armature c2 is provided with a plurality of flow guide holes c21. In the embodiment, the flow guide holes c21 are four and are distributed around the center of the armature c2. One end of the flow guide hole c21 penetrates to the side of the armature c2 close to the valve core b1 and the other end penetrates to the side of the armature c2 away from the valve core b1, so that on the one hand the fluid entering the valve cavity a11 from the flow area a15 through the intermediate hole b2 can flow to both sides of the armature c2 through the flow guide holes c21 to achieve pressure balance, improving the operation stability and accuracy of the armature c2; on the other hand, by designing the number or aperture of the flow guide holes c21, the damping force acting on the armature c2 when moving can be changed to adapt to different working conditions. It should be understood that in other embodiments, the number and position of the flow guide holes c21 can be changed, and the design does not limit this.

[0034] In the embodiment, the adapter assembly comprises a push rod d1 and a cap d2, the intermediate hole b2 comprises a first hole section b21 penetrating along the axial direction of the valve core b1 and a second hole section b22 arranged along the radial direction of the valve core b1, the second hole section b22 communicates the first hole section b21 and the valve cavity a11, the cap d2 is connected to one end of the first hole section b21 away from the flow area a15, and the push rod d1 abuts between the armature c2 and the cap d2, so that the machining difficulty of the valve core b1 and the overall assembly difficulty are effectively reduced, the transmission of the acting force between the armature c2 and the valve core b1 is more stable through the arrangement of the adapter assembly, and the coaxiality requirement between the armature c2 and the valve core b1 is reduced; in addition, the perpendicular arrangement of the second hole section b22 relative to the first hole section b21 enables the fluid flowing into the valve cavity a11 from the flow area a15 to flow more stably.

[0035] Further, the side of the armature c2 facing the valve core b1 is provided with a mounting groove c22, the end of the push rod d1 is clamped in the mounting groove c22, and the push rod d1 is made of a non-magnetic material, which on the one hand facilitates the assembly between the push rod d1 and the armature c2 and on the other hand effectively avoids the leakage of the magnetic field of the armature c2.

[0036] Further, the side surface of the cap d2 is provided with a raised cap edge d21, the adjusting end of the valve core b1 is provided with an axial sink groove b3, and a gap along the axial direction of the valve core b1 is left between the cap edge d21 and the sink groove b3, so that the assembly error between the armature c2, the push rod d1 and the valve core b1 can be effectively compensated by adjusting the axial position of the cap d2 relative to the first hole section b21, and the adjustment is simple and convenient.

[0037] In the embodiment, the hole diameter of the end of the first hole section b21 close to the flow area a15 is smaller than the hole diameter of the end away from the flow area a15, so that on the one hand the fluid flowing into the first hole section b21 from the flow area a15 can be effectively slowed down to avoid the unstable situation caused by the sudden change of the pressure in the valve cavity a11, and on the other hand the hole diameter of the end of the first hole section b21 close to the flow area a15 can be designed to change the damping force when the valve core b1 moves, so as to adapt to different working conditions.

[0038] As an extension of the above-mentioned embodiment, a plug a4 is further included, the valve housing a1 is provided with a mounting hole a16 communicated to the valve cavity a11 at the end away from the valve hole a12, the plug a4 is adjustably inserted into the mounting hole a16 and the armature c2 is located between the plug a4 and the adapter assembly. The "adjustable insertion" between the plug a4 and the mounting hole a16 can be a clamping connection with interference fit or a threaded connection, and the design does not limit this. The second spring a3 abuts between the plug a4 and the armature c2, so that by adjusting the axial position of the plug a4 relative to the mounting hole a16, the pre-tightening force of the second spring a3 on the armature c2 in the initial state can be changed, thereby avoiding the situation that the pre-tightening force of the second spring a3 does not meet the requirements due to assembly errors or different working conditions, and the robustness is strong.

[0039] In the embodiment, the inlet flow channel a13 is arranged radially relative to the valve core b1, and the outlet flow channel a14 is arranged axially relative to the valve core b1, so that when the adjusting end of the valve core b1 closes the overflow area a15, the fluid of the inlet flow channel a13 can be blocked outside the intermediate hole b2 without affecting the inside of the valve cavity a11.

[0040] Further, the outer side surface of the valve core b1 is provided with two balance grooves b4 distributed in the axial direction, the balance grooves b4 are arranged in the circumferential direction around the valve core b1, and the balance grooves b4 are located inside the valve hole a12, so that the sliding of the valve core b1 relative to the valve hole a12 is more stable, and the valve core b1 can be automatically centered relative to the valve hole a12, and the coaxiality is better.

[0041] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications shall fall within the protection scope of the present disclosure.

Claims

1. An expansion valve comprising a valve core (bl) and a valve shell (al), the valve shell (al) being provided with a valve cavity (al l), a valve hole (al2), an inlet flow channel (al3) and an outlet flow channel (al4), a flow-through area (al5) being communicated between the inlet flow channel (al3) and the outlet flow channel (al4), one end of the valve hole (al2) being communicated to the flow-through area (al5) and the other end being communicated to the valve cavity (al l), the valve core (bl) being slidingly inserted into the valve hole (al2), characterized in that: Further comprising a relay assembly, an electromagnetic coil (c1) arranged in the valve cavity (a11) and an armature (c2) arranged in the electromagnetic coil (c1), the electromagnetic coil (c1) is used to drive the armature (c2) to move along the axial direction, the relay assembly is detachably connected between the armature (c2) and the valve core (b1), the valve core (b1) comprises a blocking end inserted into the flow area (a15) and an adjusting end inserted into the valve cavity (a11), the valve cavity (a11) is provided with a first spring (a2) abutting to the valve core (b1) and a second spring (a3) abutting to the armature (c2), the first spring (a2) is used to push the valve core (b1) away from the flow area (a15), and the second spring (a3) is used to push the armature (c2) to move towards the valve hole (a12) to drive the valve core (b1) to approach the flow area (a15), the valve core (b1) is provided with an intermediate hole (b2) communicating the flow area (a15) and the valve cavity (a11); The relay assembly comprises a push rod (d1) and a cap (d2), the intermediate hole (b2) comprises a first hole section (b21) penetrating along the axial direction of the valve core (b1) and a second hole section (b22) arranged along the radial direction of the valve core (b1), the second hole section (b22) communicates the first hole section (b21) and the valve cavity (a11), the cap (d2) is connected to one end of the first hole section (b21) away from the flow area (a15), and the push rod (d1) abuts between the armature (c2) and the cap (d2); The armature (c2) is provided with a mounting groove (c22) on the side facing the valve core (b1), and the end of the push rod (d1) is clamped in the mounting groove (c22), and the push rod (d1) is made of non-magnetic material; The side of the cap (d2) is provided with a raised cap edge (d21), and the adjusting end of the valve core (b1) is provided with a sink (b3) along the axial direction, and the cap edge (d21) leaves an axial gap relative to the sink (b3), so that the axial position of the cap (d2) relative to the first hole section (b21) can be adjusted; The hole diameter of one end of the first hole section (b21) close to the flow area (a15) is smaller than the hole diameter of the other end away from the flow area (a15), and the fluid can only flow into the valve cavity (a11) through the axial end of the first hole section (b21) close to the flow area (a15).

2. An expansion valve according to claim 1, characterized in that: Further comprising a cylindrical iron core (c3), the iron core (c3) is connected to the inner side of the electromagnetic coil (c1), the iron core (c3) is provided with an opening on the side facing the valve hole (a12) and makes the armature (c2) slidingly connected to the inner side of the iron core (c3), and the side wall of the iron core (c3) is provided with an inclined groove (c31) to make the iron core (c3), the electromagnetic coil (c1) and the armature (c2) form a proportional electromagnetic iron.

3. An expansion valve according to claim 2, wherein: The armature (c2) is provided with a plurality of flow guide holes (c21), one end of the flow guide hole (c21) penetrates to the side of the armature (c2) close to the valve core (b1), and the other end penetrates to the side of the armature (c2) away from the valve core (b1).

4. An expansion valve according to any one of claims 1-3, characterized in that: Also include the plug (a4), the valve shell (a1) is provided with a mounting hole (a16) communicated to the valve cavity (a11), the plug (a4) is adjustably inserted into the mounting hole (a16) and makes the armature (c2) between the plug (a4) and the adapter assembly, the second spring (a3) is abutted between the plug (a4) and the armature (c2).

5. An expansion valve according to any one of claims 1-3, characterized in that: The second spring (a3) is used to push the blocking end to close the flow area (a15) when the electromagnetic coil (c1) loses power.

6. An expansion valve according to any one of claims 1-3, characterized in that: The outer side of the valve core (b1) is provided with a plurality of balance grooves (b4) distributed along the axial direction, the balance grooves (b4) are arranged around the circumference of the valve core (b1), and the balance grooves (b4) are located inside the valve hole (a12).

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