CN210951999U - Electronic expansion valve and refrigeration equipment with same - Google Patents

Abstract

The utility model relates to an electronic expansion valve and have its refrigeration plant, including valve body, screw rod and case, the valve port has been seted up on the valve body, the screw rod is located in the valve body and the cover is located the case, the case is located in the valve body and can follow the reciprocal sliding of axis direction of screw rod is with the shutoff or open the valve port, the case with be provided with the primary shaft bearing cover between the screw rod. Also relates to a refrigeration device with the electronic expansion valve. Compared with the prior art, the beneficial effects of the utility model reside in that: through setting up the first bearing housing between case and screw rod, convert the sliding friction between case and the screw rod into the frictional force between case and first bearing housing or screw rod and first bearing housing, because the wear resistance and the lubricating property of first bearing housing are better, can effectively reduce the friction loss who reduces case and screw rod itself, consequently the operation is more stable, and life is longer.

Description

Electronic expansion valve and refrigeration equipment with same

Technical Field

The utility model relates to a refrigeration plant technical field especially relates to an electronic expansion valve and have its refrigeration plant.

Background

In the air-conditioning refrigeration process, a control valve is usually required to control the amount of liquid supplied to the evaporator. A thermostatic expansion valve is generally used in a conventional air-conditioning refrigeration device, however, when the ambient temperature is low, the pressure of the temperature sensing medium inside the thermostatic expansion valve is greatly reduced, and therefore, the adjustment performance of the thermostatic expansion valve is affected. In order to make the air conditioner have better regulation performance, the electronic expansion valve is produced. The electronic expansion valve uses a thermocouple or a thermal resistor as a temperature sensing part, can still accurately adjust the liquid supply amount under the low temperature condition, and can control the liquid supply amount of the evaporator through a preset program, so the electronic expansion valve can replace a thermal expansion valve to be applied to air-conditioning refrigeration equipment.

The electronic expansion valve opens and closes a valve port arranged on the valve body through the movement of the screw rod assembly in the guide sleeve and the nut seat, thereby realizing the purposes of flow regulation and throttling and pressure reduction. Traditional electronic expansion valve, there is relative motion between case and the screw rod subassembly when its valve body operates, produces sliding friction between case outer wall and the screw rod subassembly inner wall, and the impurity foreign matter after wearing and tearing will gather gradually and lead to the valve body card to die to influence the stability of screw rod subassembly drive valve core motion, make the unable normal work of electronic expansion valve, influence its life.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem that an electronic expansion valve that wear resistance is better, stable performance and life are longer is provided to above-mentioned prior art current situation.

The utility model discloses the second technical problem that will solve provides a better, the stable performance of wear resistance and the longer refrigeration plant of life to above-mentioned prior art current situation.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the electronic expansion valve comprises a valve body, a screw and a valve core, wherein a valve port is formed in the valve body, the screw is arranged in the valve body and sleeved on the valve core, the valve core is arranged in the valve body and can slide in a reciprocating mode along the axis direction of the screw so as to plug or open the valve port, and a first bearing sleeve is arranged between the valve core and the screw.

In one embodiment, the screw has a receiving cavity and a first flange formed on an inner wall thereof, the first bearing sleeve is received in the receiving cavity, a first end of the first bearing sleeve abuts against the first flange, and a second end of the first bearing sleeve extends out of the screw.

In one embodiment, the first bearing sleeve outer wall and the screw inner wall are in interference fit.

In one embodiment, the outer wall of the valve core is provided with a second flange, the first end of the first bearing sleeve abuts against the second flange, and the second end of the first bearing sleeve extends out of the screw.

In one embodiment, the inner wall of the first bearing sleeve and the outer wall of the valve core may be in a clearance fit, a transition fit or an interference fit.

In one embodiment, the electronic expansion valve further includes a second bearing sleeve, the second bearing sleeve is disposed between the valve core and the screw, and the second bearing sleeve and the first bearing sleeve are coaxial and are disposed at intervals.

In one embodiment, the electronic expansion valve further includes a nut, a rotor assembly, and a locking member, the nut is sleeved outside the screw and is in threaded connection with the screw, the nut is provided with a through hole for the valve element to pass through, the valve element is fixed in the through hole and moves synchronously with the nut, the locking member is connected between the nut and the rotor assembly, and the rotor assembly is sleeved outside the nut and is fixedly connected with the nut through the locking member.

In one embodiment, the electronic expansion valve further comprises: the limiting piece is fixed on the outer wall of the screw rod and located at one end, close to the valve port, of the screw rod, and is used for blocking and matching the movement of the nut towards the valve port.

In one embodiment, the electronic expansion valve further comprises: the first elastic element is sleeved between the valve core and the nut, one end of the first elastic element abuts against the first bearing sleeve, and the other end of the first elastic element abuts against the inner wall of the nut;

the second elastic element is sleeved at one end of the nut, which is far away from the valve port, and can provide pretightening force for the valve core.

In one embodiment, the electronic expansion valve further includes a positioning sleeve, the positioning sleeve is sleeved on an end of the nut away from the valve port, an upper end of the positioning sleeve is approximately flush with an upper end of the valve core, and the positioning sleeve is located between the nut and the second elastic element.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a refrigeration device is provided, which comprises the electronic expansion valve.

Compared with the prior art, the beneficial effects of the utility model reside in that:

according to the electronic expansion valve and the refrigeration equipment with the same, sliding friction force between the valve core and the screw is converted into friction force between the valve core and the first bearing sleeve or between the screw and the first bearing sleeve through the first bearing sleeve arranged between the valve core and the screw, and the friction loss between the valve core and the screw can be effectively reduced due to the fact that the first bearing sleeve is good in wear resistance and lubrication performance, so that the electronic expansion valve is more stable in operation and longer in service life.

Drawings

FIG. 1 is a schematic cross-sectional view of an electronic expansion valve provided in one embodiment;

fig. 2 is a schematic cross-sectional view of the electronic expansion valve shown in fig. 1, with a portion of the structure omitted;

fig. 3 is a schematic cross-sectional view of an electronic expansion valve provided in one embodiment with a part of the structure omitted;

fig. 4 is a schematic cross-sectional view of an electronic expansion valve provided in one embodiment, with a part of the structure omitted.

Reference numerals:

the valve comprises an electronic expansion valve-100, a valve body-10, a valve port-11, a valve seat-12, a valve sleeve-13, a liquid inlet pipe-14, a liquid outlet pipe-15, a screw-20, an accommodating cavity-21, a first flange-22, a valve core-30, a second flange-31, a first bearing sleeve-41, a second bearing sleeve-42, a nut-50, a rotor assembly-60, a locking piece-70, a limiting piece-81, a positioning sleeve-82, a first elastic element-91 and a second elastic element-92.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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 when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

It should be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal, top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, which are schematic structural views of an electronic expansion valve 100 according to an embodiment of the disclosure, the electronic expansion valve 100 is applied to a refrigeration device, and a fluid medium flowing through the electronic expansion valve 100 is a refrigerant for performing heat and cold exchange in the refrigeration device. When the electronic expansion valve 100 is used, the electronic expansion valve 100 is installed at an inlet of an evaporator of refrigeration equipment, the electronic expansion valve 100 serves as a boundary element between a high-pressure side and a low-pressure side of the refrigeration equipment, and high-pressure liquid refrigerant is throttled and depressurized, so that the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of an external refrigeration load.

It is understood that the refrigeration device may be, but is not limited to, an air conditioning system, and other fluid media other than refrigerant may flow through the electronic expansion valve 100, as long as the electronic expansion valve 100 can throttle and depressurize the fluid media.

The electronic expansion valve 100 of the present preferred embodiment includes a valve body 10, a screw 20, a valve core 30, a nut 50, a rotor assembly 60, and a locking member 70.

The valve body 10 is provided with a valve port 11, the screw 20 is arranged in the valve body 10 and sleeved on the valve core 30, and the valve core 30 is arranged in the valve body 10 and can slide back and forth along the axial direction of the screw 20 to block or open the valve port 11.

The rotor assembly 60 is sleeved outside the nut 50, and the nut 50 and the rotor assembly 60 are fixedly connected and synchronously rotated through the locking member 70. The screw 20 is inserted into the nut 50 and is threadedly coupled to the nut 50, and the valve cartridge 30 is coupled to the nut 50 and moves in synchronization with the nut 50.

Further, the electronic expansion valve 100 further includes a valve seat 12 fixedly connected to the valve body 10 and a valve sleeve 13 fixedly connected to the valve seat 12, wherein the valve seat 12 and the valve sleeve 13 can be fastened to each other to form a valve cavity. The valve housing 13 is substantially in the shape of a sleeve, and the valve seat 12 is substantially in the shape of a ring and is fitted around the valve body 10.

The two sides of the valve body 10 are respectively connected with a liquid inlet pipe 14 and a liquid outlet pipe 15, and the medium fluid enters the electronic expansion valve 100 through the liquid inlet pipe 14 and then flows out of the electronic expansion valve 100 through the liquid outlet pipe 15.

The valve body 10 is provided with a valve port 11 along its own axis, the valve port 11 is communicated with the liquid inlet pipe 14, and the valve port 11 is used for allowing one end of the valve core 30 to extend into, so as to block the fluid medium in the electronic expansion valve 100 from being discharged outside through the valve port 11. When the valve core 30 closes the valve port 11, the electronic expansion valve 100 is closed; when the valve core assembly 30 releases the seal of the valve port 11, the electronic expansion valve 100 is opened.

Further, the spool 30 is configured to move in synchronization with the nut 50, and the spool 30 can move up and down and rotate with respect to the valve port 11.

In addition, the electronic expansion valve 100 further includes a stator assembly (not shown), which may be a coil, configured to be sleeved outside the valve housing 13 during installation, and after the stator assembly is powered on, the magnetic rotor assembly 60 rotates under the action of magnetic field torque of the stator assembly to drive the nut 50 to rotate around its axis, and the screw thread fit between the screw 20 and the nut 50 converts the rotational movement of the nut 50 into the movement of the nut 50 in the axial direction, so that the valve core 30 connected thereto is displaced in the axial direction, and the relative position between the valve core 30 and the valve port 11 formed on the valve body 10 is changed, thereby opening and closing the electronic expansion valve 100 and controlling the fluid flow.

In this embodiment, the electronic expansion valve 100 is an electric electronic expansion valve, the rotor assembly 60 is a motor rotor made of a permanent magnet in the stepping motor, the stator assembly is a motor stator in the stepping motor, the stepping motor receives a logic digital signal provided by the control circuit and then transmits the signal to each phase coil of the motor stator, and the motor rotor made of the permanent magnet is subjected to a magnetic moment to generate a rotational motion, so that a motion process that the stator assembly drives the rotor assembly 60 to rotate is realized.

It will be appreciated that references herein to the nut 50 or other component being axial are to be understood as referring to directions along its own axis.

Because the screw 20 and the valve core 30 are mostly made of stainless steel, the wear resistance is not good enough, and particularly after the product runs for a long time, the contact surface between the valve core 30 and the screw 20 is worn seriously. In addition, the length of the central through hole of the screw rod 20 is long, the surface processing quality of the screw rod is difficult to guarantee, the abrasion is further aggravated, and in severe cases, the abraded foreign impurities can be gathered and cause the valve body to be blocked, so that the valve body cannot work normally.

Therefore, in the preferred embodiment, an electronic expansion valve 100 with good wear resistance is provided, and the electronic expansion valve 100 is provided with the first bearing housing 41 between the valve core 30 and the screw 20. Because the bearing sleeve is made of a material with excellent lubricating property and wear resistance, the bearing sleeve is arranged between the valve core 30 and the screw 20 which move mutually, so that the problem of abrasion of the electronic expansion valve 100 after long-term operation can be effectively solved, and the reliability of the product is improved.

It can be understood that the first bearing sleeve 41 may be configured to rotate relative to the valve core 30, or may be configured to be stationary relative to the valve core 30, so as to convert the sliding friction force between the valve core 30 and the screw 20 into the friction force between the valve core 30 and the first bearing sleeve 41 or between the screw 20 and the first bearing sleeve 41, which can effectively reduce the friction loss between the valve core 30 and the screw 20, and therefore, the operation is more stable, and the service life is longer.

Referring further to fig. 1 and 2, in one embodiment, the outer wall of the valve core 30 is provided with a second flange 31, a first end of the first bearing sleeve 41 abuts against the second flange 31, and a second end of the first bearing sleeve 41 extends out of the screw 20. The first bearing sleeve 41 and the outer wall of the valve core 30 can be in clearance fit, transition fit or interference fit.

Referring to fig. 3, in one embodiment, the screw 20 has an accommodating cavity 21 formed on an inner wall thereof and a first flange 22 formed thereon, the first bearing sleeve is accommodated in the accommodating cavity 21, a first end of the first bearing sleeve 41 abuts against the inner wall of the accommodating cavity 21, and a second end of the first bearing sleeve 41 extends out of the screw 20.

In one embodiment, the first bearing housing 41 is in interference fit with the inner wall of the screw 20.

Referring to fig. 4, in one embodiment, the electronic expansion valve 100 further includes a second bearing sleeve 42, the second bearing sleeve 42 is disposed between the valve core 30 and the screw 20, and the second bearing sleeve 42 and the first bearing sleeve 41 are disposed coaxially and spaced apart from each other.

In one embodiment, the first bearing sleeve 41 is made of tin bronze, aluminum bronze, or powder metallurgy; in one embodiment, the outer surface of the first bearing sleeve 41 is provided with a coating layer made of polytetrafluoroethylene containing nickel.

Likewise, the second bearing sleeve 42 may be made of tin bronze, aluminum bronze, or powder metallurgy. In one embodiment, the surface of the second bearing sleeve 42 is provided with a coating layer made of polytetrafluoroethylene containing nickel.

Further, the electronic expansion valve 100 further includes a stopper 81 fixed on an outer wall of the screw 20 and located at an end of the screw 20 close to the valve port 11, for stopping the movement of the nut 50 toward the valve port 11.

Specifically, when the nut 50 drives the valve element 30 to move downward, i.e. to move in a direction of closing the valve port 11, the valve element 30 abuts against the valve port 11 and cannot move continuously, and the nut 50 moves continuously downward, so as to avoid excessive movement of the nut 50 in the direction of the valve port, a limiting member 81 is disposed on an outer wall of the screw 20 to limit a position of the nut 50 when the valve body 10 is closed.

When the nut 50 drives the valve element 30 to move upward, i.e. to move in the direction of opening the valve port 11, the threaded section between the nut 50 and the screw 20 is transited to the smooth section, and the nut 50 slips and cannot move further upward. The thread engagement between the screw 20 and the nut 50 is common here and will not be described here.

Compared with the mode of limiting the maximum opening and the minimum opening of the valve body 10, the mode of limiting the maximum opening and the minimum opening of the valve body can effectively reduce collision and reduce abnormal sound generated by collision.

In addition, the electronic expansion valve 100 further includes a first elastic member 91 and a second elastic member 92.

The first elastic element 91 is sleeved between the valve core 30 and the nut 50, one end of the first elastic element 91 abuts against the first bearing sleeve 41, the other end of the first elastic element 91 abuts against the inner wall of the nut 50 to provide axial pretightening force for the first bearing sleeve 41, so that the first bearing sleeve 41 can be tightly attached to the valve core 30 or the screw 20, the valve core 30 is prevented from shaking in the moving process, the noise generated by the valve core is reduced, the use reliability of the electronic expansion valve 100 is improved, the abrasion caused by the shaking between the screw 20 and the nut 50 can be reduced, and the service life is prolonged.

The second elastic element 92 is sleeved at an end of the nut 50 away from the valve port 11, and when the nut 50 moves up to the maximum stroke and then moves down, alignment in the moving down process is facilitated under the action of the second elastic element 92, and the occurrence of shaking can be reduced. In addition, a positioning sleeve 82 is fixed at one end of the nut 50 far away from the valve port 11, the upper end of the positioning sleeve 82 is approximately flush with the upper end of the valve core 30, and the positioning sleeve 82 is positioned between the nut 50 and the second elastic element 92, so that the shaking of the valve core 30 in the movement process can be further reduced. During the rotation of the rotor assembly 60 with the nut 50, the nut 50 moves upward until the nut 50 is disengaged from the threaded rod 20 and becomes a shaft-hole connection, at which time the nut 50 and the valve cartridge 30 no longer move upward.

The electronic expansion valve 100 operates as follows:

stator module circular telegram back produces magnetic field, rotor module 60 made by magnetic material rotates under the drive in magnetic field, rotor module 60 passes through locking piece 70 fixed connection with nut 50, rotor module 60's rotation drives nut 50 and rotates, form the nut screw cooperation between nut 50 and the screw rod 20, the screw rod 20 is fixed to be set up on valve body 10, consequently, the relative screw rod 20 of nut 50 can be driven to the rotation of nut 50 relative screw rod 20 and is telescopic motion, thereby realize that stator module 60 moves is driven to the realization, rotor module 60 drives nut 50 again and moves.

The nut 50 drives the valve core 30 to move synchronously through the first elastic element 91 in the telescopic motion relative to the axial direction of the valve body 10, the valve core 30 moves towards the valve port 11 formed on the valve body 10 under the driving of the nut 50, and when the valve core 30 closes the valve port 11, the electronic expansion valve 100 is closed; when the valve spool 30 is released from closing the valve port 11, the electronic expansion valve 100 is opened. In addition, the specific opening degree of the valve port 11 can be adjusted step by the valve core 30 to adjust the flow rate of the fluid medium step by step. Because the opening caliber of the valve port 11 in the electronic expansion valve 100 is relatively small, the flow rate of the fluid medium is reduced, and thus the throttling and pressure reducing process of the electronic expansion valve 100 on the fluid medium is realized.

The utility model also provides an use the refrigeration plant (not shown) of above-mentioned electronic expansion valve 100, this refrigeration plant is owing to used foretell electronic expansion valve 100, and entire system's reliability and stability improve, have more extensive application prospect.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An electronic expansion valve (100) comprises a valve body (10), a screw (20) and a valve core (30), wherein a valve port (11) is formed in the valve body (10), the screw (20) is arranged in the valve body (10) and sleeved on the valve core (30), the valve core (30) is arranged in the valve body (10) and can slide in a reciprocating manner along the axis direction of the screw (20) to plug or open the valve port (11), and a first bearing sleeve (41) is arranged between the valve core (30) and the screw (20).

2. The electronic expansion valve (100) according to claim 1, wherein the screw (20) has an inner wall opened with a receiving cavity (21) and a first flange (22), the first bearing sleeve (41) is received in the receiving cavity (21), a first end of the first bearing sleeve (41) abuts against the first flange (22), and a second end of the first bearing sleeve (41) extends out of the screw (20).

3. An electronic expansion valve (100) according to claim 2, wherein the outer wall of the first bearing sleeve (41) and the inner wall of the screw (20) are in an interference fit.

4. The electronic expansion valve (100) according to claim 1, wherein the outer wall of the valve core (30) is provided with a second flange (31), a first end of the first bearing sleeve (41) abuts against the second flange (31), and a second end of the first bearing sleeve (41) extends out of the screw (20).

5. The electronic expansion valve (100) according to any of claims 2 to 4, wherein the electronic expansion valve (100) further comprises a second bearing sleeve (42), the second bearing sleeve (42) is disposed between the valve core (30) and the screw (20), and the second bearing sleeve (42) and the first bearing sleeve (41) are coaxially disposed at an interval.

6. The electronic expansion valve (100) according to claim 5, wherein the electronic expansion valve (100) further comprises a nut (50), a rotor assembly (60) and a locking member (70), the nut (50) is sleeved outside the screw (20) and is in threaded connection with the screw (20), the locking member (70) is connected between the nut (50) and the rotor assembly (60), and the rotor assembly (60) is sleeved outside the nut (50) and is fixedly connected with the nut (50) through the locking member (70).

7. The electronic expansion valve (100) according to claim 6, wherein the electronic expansion valve (100) further comprises a stopper (81), and the stopper (81) is fixed to an outer wall of the screw rod (20) and located at an end of the screw rod (20) close to the valve port (11) for blocking movement of the nut (50) toward the valve port (11).

8. An electronic expansion valve (100) according to claim 7, wherein the electronic expansion valve (100) further comprises:

the first elastic element (91) is sleeved between the valve core (30) and the nut (50), one end of the first elastic element (91) is abutted against the first bearing sleeve (41), and the other end of the first elastic element (91) is abutted against the inner wall of the nut (50);

the second elastic element (92) is sleeved at one end, far away from the valve port (11), of the nut (50) and can provide pre-tightening force for the valve core (30).

9. The electronic expansion valve (100) according to claim 8, wherein the electronic expansion valve (100) further comprises a positioning sleeve (82), the positioning sleeve (82) is sleeved on an end of the valve element (30) away from the valve port (11), an upper end of the positioning sleeve (82) is substantially flush with an upper end of the valve element (30), and the positioning sleeve (82) is located between the nut (50) and the second elastic element (92).

10. A refrigeration device, comprising an electronic expansion valve (100) according to any of claims 1 to 9.

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