CN111365911A

CN111365911A - Expansion valve and automobile air conditioning system

Info

Publication number: CN111365911A
Application number: CN202010206303.4A
Authority: CN
Inventors: 不公告发明人
Original assignee: Jiyang College of Zhejiang A&F University
Current assignee: Jiyang College of Zhejiang A&F University
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-07-03
Anticipated expiration: 2040-03-23
Also published as: CN111365911B

Abstract

The invention discloses an expansion valve, which comprises a valve body, a power head, a push rod, a valve core component, an adjusting bolt and an electromagnetic valve, wherein the push rod is arranged between the valve core component and the power head, the valve body also comprises a first valve chamber and a second valve chamber, the adjusting bolt is at least partially positioned in the first valve chamber, the electromagnetic valve is at least partially positioned in the second valve chamber, the upper part of the first valve chamber is provided with a valve hole, the bottom of the first valve chamber is opened and sealed by the adjusting bolt, the valve core component comprises a valve core and a guide rod, a valve core frame is not arranged in the first valve chamber, an elastic component is also arranged in the first valve chamber, the valve core is pre-tightened by the elastic component to move towards the. The expansion valve provided by the invention has the advantages that the elastic component is arranged in the first valve chamber, the refrigerant flow is regular, the generation of turbulence is weakened, the noise factor generated by an automobile air conditioning system is eliminated, and the working performance of an automobile is improved.

Description

Expansion valve and automobile air conditioning system

Technical Field

The invention relates to the technical field of refrigeration systems, in particular to an automobile air conditioning system and an expansion valve.

Background

The expansion valve is a throttling component commonly used in air conditioners and refrigeration equipment, can throttle and reduce pressure of liquid refrigerant from the condenser, and can adjust the flow of the refrigerant sent from the condenser to the evaporator according to the temperature of the outlet of the evaporator so as to adapt to the requirement of continuously changing refrigeration load. In some cases, in order to satisfy some systems, the opening degree of the expansion valve is generally set to zero by an external solenoid valve.

However, in the throttling process of the prior art, the valve core is elastically abutted against the valve hole through the valve core frame and the spiral spring, when a high-temperature and high-pressure refrigerant flows through the valve chamber, due to the structure of the spiral spring, the flowing direction of the refrigerant is disordered, and turbulent flow is formed in the valve chamber and can induce noise of an air-conditioning refrigeration system; in addition, when the high-temperature and high-pressure refrigerant flows through the valve chamber, the high pressure may impact the valve body frame to cause the valve body to vibrate and generate noise.

Therefore, how to reduce the noise of the air conditioning system of the automobile is a technical problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

In order to solve the technical defects in the prior art, the invention provides an expansion valve, which comprises a valve body, a power head, a push rod, a valve core component, an adjusting bolt and a solenoid valve, wherein the push rod is arranged between the valve core component and the power head, the valve body further comprises a first valve chamber and a second valve chamber, the adjusting bolt is at least partially positioned in the first valve chamber, the solenoid valve is at least partially positioned in the second valve chamber, a valve hole is arranged at the upper part of the first valve chamber, the bottom part of the first valve chamber is opened and sealed by the adjusting bolt, the adjusting bolt is integrally formed by a base body, a connecting part with a smaller diameter than the base body and a supporting part arranged on the connecting part, the supporting part is provided with an opening part and a bottom part opposite to the opening part, the valve core component comprises a valve core and a guide rod, a valve core frame, and an elastic assembly is further arranged in the first valve chamber, one end of the elastic assembly is abutted to the valve core, the other end of the elastic assembly is abutted to the bottom of the supporting part, the valve core moves towards the direction of closing the valve hole through the pre-tightening of the elastic assembly, and moves towards the valve opening direction of the valve hole through the push rod.

The elastic component is formed by butterfly springs which are oppositely arranged in a positive and negative direction, each butterfly spring comprises a butterfly spring body and a bottom surface, each butterfly spring body is approximately frustum-shaped, each bottom surface is of a plane structure, and a through hole is formed in the position of the approximate center of each bottom surface.

The guide rod is away from the bottom of the adjusting bolt by a certain distance, one end of the guide rod penetrates through the through hole, the elastic assembly is sleeved on the periphery of the guide rod, and the elastic assembly is matched with the guide rod through the through hole to restrain the transverse disturbance of the valve core component.

The adjusting bolt is characterized in that a blind hole is further formed in the position of the approximate center of the bottom of the adjusting bolt, one end of the guide rod penetrates through the blind hole, the through hole is inserted into the adjusting bolt, the elastic assembly is sleeved on the periphery of the guide rod, and the elastic assembly is matched with the guide rod through the through hole to restrain the transverse disturbance of the valve core component.

The butterfly spring at one end of the elastic component, which is close to the adjusting bolt, is abutted or abutted against the bottom of the adjusting bolt to support the butterfly spring, the bottom surface of the butterfly spring at one end of the elastic component, which is close to the valve core, is abutted or abutted against the valve core, at least part of the valve core is positioned in the through hole, and the diameter of the valve core is not smaller than the inner diameter of the through hole.

The valve core, the guide rod and the push rod are integrally formed.

The inner diameter of the through hole in the bottom surface of the belleville spring is slightly larger than the diameter of the guide rod.

An expansion valve comprises a valve body, a power head, a push rod, a valve core component, an adjusting bolt and an electromagnetic valve, wherein the push rod is arranged between the valve core component and the power head, the valve body further comprises a first valve chamber and a second valve chamber, at least part of the adjusting bolt is positioned in the first valve chamber, at least part of the electromagnetic valve is positioned in the second valve chamber, the upper part of the first valve chamber is provided with a valve hole, the bottom of the first valve chamber is opened and sealed by the adjusting bolt, the adjusting bolt is integrally formed by a base body, a connecting part with a diameter smaller than that of the base body and a supporting part arranged on the connecting part, the supporting part is provided with an opening part and a bottom opposite to the opening part, the expansion valve is characterized in that the valve core component is a core body with a steel ball structure, a valve core frame is not arranged in the valve chamber, an elastic component is, the butterfly spring comprises a butterfly spring body and a bottom surface, the butterfly spring body is approximately in a frustum shape, the bottom surface is of a plane structure, a through hole is further formed in the position, approximately, of the center of the bottom surface, the butterfly spring, close to one end of the adjusting bolt, of the elastic assembly is abutted or abutted against the bottom of the adjusting bolt to support the butterfly spring, the bottom surface of the butterfly spring, close to one end of the valve core component, of the elastic assembly is abutted or abutted against the valve core, the valve core component moves in the direction of closing the valve hole through the elastic assembly in a pre-tightening mode, and moves in the valve opening direction of the valve hole through the push rod.

In addition, the invention also provides an automobile air conditioning system which comprises a condenser, an evaporator and an expansion valve, wherein the expansion valve is the expansion valve.

Compared with the prior art, the expansion valve provided by the invention has the advantages that the elastic component consisting of the butterfly springs with the opposite sides is arranged on the periphery of the guide rod, so that when a refrigerant flows through the valve chamber, the flow path is regular, the generation of turbulence is weakened, factors inducing an air conditioning system to generate noise are eliminated, and the working reliability of an automobile system is greatly improved; the valve core frame is not required to be additionally arranged, and the scheme that noise can be reduced by a simple structure can be easily realized.

The automobile air conditioning system has the expansion valve, so the automobile air conditioning system has the technical effect of the expansion valve.

Drawings

FIG. 1 is a schematic representation of a prior art flow simulation of refrigerant as it flows into a valve chamber;

FIG. 2 is a schematic structural view of an embodiment of an expansion valve body according to the present invention;

FIG. 3 is a schematic perspective view of a portion of the expansion valve;

FIG. 4 is a schematic cross-sectional view of an expansion valve in another orientation;

FIG. 5 is a schematic view of the valve core component of FIG. 2;

FIG. 6 is a schematic cross-sectional view of the adjusting bolt of FIG. 2;

FIG. 7 is a perspective view of the Belleville spring of FIG. 2 forming a resilient member;

FIG. 8 is a schematic view of a fluid simulation of the refrigerant flow into the valve chamber with the resilient member disposed therein;

FIG. 9 is a schematic cross-sectional view of another embodiment of an expansion valve body of the present invention;

FIG. 10 is a schematic view of the valve core, guide rod and push rod of FIG. 9 integrally formed;

fig. 11 is a schematic cross-sectional view of an expansion valve body according to still another embodiment of the present invention.

Detailed Description

In order to solve the problem of noise in an automobile air conditioning system in the prior art, the expansion valve in the combined air conditioning and refrigerating system is intensively researched. Through a number of experiments, the present inventors have found that the structure of the expansion valve in the prior art is one cause of the induction of air conditioning noise.

Referring to fig. 1, fig. 1 is a schematic view showing a prior art refrigerant flow simulation in a valve chamber, in which it can be seen that a part of the refrigerant enters an inner space of a coil spring, a part of the refrigerant flows out of the valve chamber, and the refrigerant flow direction is disordered, thereby forming turbulence in the valve chamber, which can induce noise in an air conditioning and refrigeration system.

On the basis of the above findings, the present invention further proposes a technical solution for reducing turbulence, which is described in detail below. In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described below with reference to the accompanying drawings and examples.

Referring to fig. 2-5, fig. 2 is a schematic structural view illustrating an embodiment of a valve body of an expansion valve, and fig. 3 is a schematic partial perspective view illustrating the expansion valve, where the expansion valve includes a valve body 1, a push rod 2, a valve core component 3, an adjusting bolt 4, a power head 5, and a solenoid valve 8. For convenience of description, an end of the valve body 1 at the upper side in the drawings is referred to as a top, and an end at the lower side is referred to as a bottom.

The unit head 5 is fixed on the top of the valve body 1, the adjusting bolt 4 is fixed on the bottom of the valve body 1, the push rod 2 is positioned inside the valve body 1, one end of the push rod 2 is fixed with the unit head 5, and the other end is abutted against the valve core component 3. Referring to fig. 5, the valve core component 3 includes a valve core 31 and a guide rod 32, and the valve core 31 and the guide rod 32 are fixedly connected, and here, may be fixed by welding.

The valve body 1 is made of metal section bars such as aluminum section bars, the shape of the valve body is approximately cuboid, the valve body 1 comprises a first side surface 111, a second side surface 112 and a third side surface 113, the first side surface 111 is provided with a first connector 11, the second side surface 112 is provided with a second connector 12, the first side surface 111 and the second side surface 112 are oppositely arranged, the third side surface 113 is adjacent to the first side surface 111, and the third side surface 113 is adjacent to the second side surface 112; in addition, a third port 13 is disposed on the first side 111 near the upper portion of the valve body, and a fourth port 14 is disposed on the second side 112 near the upper portion of the valve body. The first port 11 and the second port 12 are both substantially cylindrical through holes extending in the transverse direction, and are respectively disposed on opposite sides of the lower portion of the valve body 1. In the valve body 1, a first passage is formed by the first port 11, the second port 12 and the refrigerant passage connecting them, and a second passage (corresponding to a return passage) is formed by the third port 13, the fourth port 14 and the refrigerant passage connecting them, and the second passage is a substantially cylindrical through hole that penetrates laterally through the upper portion of the valve body 1.

Referring to fig. 4, the valve body 1 further defines a first valve chamber 15 and a second valve chamber 16, the first valve chamber 15 is a cylindrical stepped bore which is formed in the bottom of the valve body 1 and extends longitudinally, the second valve chamber 16 is formed on a third side 113, and the solenoid valve 8 is at least partially located in the second valve chamber 16. When the electromagnetic valve 8 is in the open state, the second valve chamber 16 communicates with the first valve chamber 15, the second valve chamber 16 communicates with the first port 11, the refrigerant enters the second valve chamber 16 from the first port 11, flows into the first valve chamber 15 again, and controls the flow rate of the second port 12 through the valve body member 3, thereby realizing the flow rate control, when the required flow rate is zero, the electromagnetic valve 8 is in the closed state, the refrigerant flowing from the second valve chamber 16 into the first valve chamber 15 is blocked, and the flow rate of the refrigerant in the second port 12 is regarded as zero. This part of the solenoid valve 8 is prior art and will not be described further herein.

The upper portion of the first valve chamber 15 is provided with a valve hole 6, one end of the valve hole 6 is coaxially communicated with the first valve chamber 15, the other end thereof is communicated with the lower side of the second port 12 (i.e., the side close to the bottom of the valve body 1), the bottom of the first valve chamber 15 is opened, and the bottom of the first valve chamber 15 is sealed by an adjusting bolt 4. In order to prevent the refrigerant from leaking, a sealing element is arranged between the adjusting bolt 4 and the valve body 1 for sealing.

Referring to fig. 6, fig. 6 is a schematic view of the adjusting bolt 4, the adjusting bolt 4 is integrally formed by a base 41, a connecting portion 42 having a smaller diameter than the base 41, and a supporting portion 43 disposed on the connecting portion 42, the supporting portion 43 has an opening 44 and a bottom portion 45 opposite to the opening, a blind hole 45a is further opened at a substantially central position of the bottom portion 45, and the blind hole 45a extends along a bottom direction of the valve body.

In order to provide a preload force for closing the expansion valve and to improve the operation performance of the expansion valve, an elastic member 7 is further provided in the valve chamber 15 to be engaged with the guide rod 32.

Specifically, the elastic component 7 is formed by butterfly springs arranged in opposite directions, one end of the elastic component 7, which is close to the upper portion of the valve body 1, abuts against the valve element 31, and one end, which is close to the lower portion of the valve body 1, abuts against the bottom 45 of the support portion, as shown in fig. 7, fig. 7 is a schematic structural diagram of the butterfly spring, the butterfly spring includes a butterfly spring body 71 and a bottom surface 72, the butterfly spring body 71 is substantially frustum-shaped, the bottom surface 72 is a plane structure, the bottom surface 72 is further provided with a through hole 73, the guide rod 32 is inserted into the blind hole 45a of the adjusting bolt through the through hole 73, and the valve element 31 is pre-tightened by the elastic component formed by the butterfly springs arranged in opposite directions to move in the direction of.

Specifically, a belleville spring bottom surface 72 at one end of the elastic component 7 close to the valve core 31 abuts against or is abutted against the valve core 31, the valve core 31 is at least partially positioned in the through hole 73, and the belleville spring 72 at one end of the elastic component 7 close to the adjusting bolt 4 abuts against or is abutted against the adjusting bolt bottom 45 to support the belleville spring.

In order to allow the guide bar 32 to move smoothly in the axial direction, the inner diameter of the through hole 73 of the bottom surface of the belleville spring may be set slightly larger than the diameter of the guide bar. The number of the belleville springs is not less than 3, and in the embodiment, the number of the belleville springs is 5, and when the belleville springs are actually arranged, the number of the belleville springs can be set according to the system performance, and the setting is not limited here. By providing the elastic member 7 composed of the disc springs disposed in the first valve chamber 15 in the opposite directions, when the high-pressure refrigerant enters the first valve chamber 15, pressure fluctuation and flow rate change occur, and the spool 31 vibrates and generates noise, the elastic member 7 can suppress the vibration of the spool and the generation of noise by generating a resistance force in the opposite direction to the vibration direction by the disc springs. The expansion valve with the structure does not need to install the valve core frame in the first valve chamber 15, has simple structure, is convenient to install, and can effectively reduce the cost.

By providing the elastic member 7 composed of the disc springs disposed in the opposite directions on the outer periphery of the guide rod, the elastic member 7 gives potential energy to the guide rod 32 by the engagement of the disc spring through hole 73 and the guide rod 32, and the vibration of the push rod 2 and the valve body member 3 due to the variation of the refrigerant pressure is suppressed, thereby reducing the noise.

In addition, referring to fig. 8, fig. 8 is a schematic view showing a fluid simulation in which the elastic member 7 formed by the butterfly springs arranged in the opposite directions is disposed when the refrigerant flows into the first valve chamber 15. Compared with the coil spring in the prior art, the elastic component 7 formed by the butterfly springs arranged oppositely is arranged on the periphery of the guide rod 31, so that the flow path of the refrigerant is more regular when the refrigerant flows into the first valve chamber 15, a stable annular flow path is formed, the generation of turbulence is weakened, the factor inducing the noise of an air conditioning system is eliminated, and the working reliability of the automobile system is greatly improved.

Referring to fig. 9 and 10, fig. 9 is a schematic cross-sectional view of a valve body according to another embodiment of the present invention, and fig. 10 is a schematic structural view of a rod-shaped valve core. This embodiment is different from the previous embodiment in that the valve body, the guide rod and the push rod are integrated, and vibration caused by impact between the valve body 31 and the push rod 2 is eliminated when the expansion valve is operated, thereby further reducing noise.

In order to prevent the valve element from falling out of the through hole of the belleville spring during operation of the expansion valve, the diameter of the valve element in the above embodiment should be not smaller than the inner diameter of the through hole.

Further, the blind hole 45a is coaxially disposed with the push rod 2, the valve hole 6, and the valve core member 3, so that the valve core 31 can better close the valve hole 6 when the valve core member 3 reciprocates in the axial direction along with the push rod 2.

In the above embodiment, the guide rod 32 drives the valve element 31 to reciprocate in the axial direction by forming the blind hole 45a in the bottom 45 of the insertion support portion, but the present invention can also be realized by other embodiments. As shown in fig. 11, fig. 11 is a schematic cross-sectional view of a thermal expansion valve according to another embodiment of the present invention, and the main difference from the above-mentioned embodiment is that, in this embodiment, the support bottom 45 may not be provided with a blind hole 45a, and one end of the guide rod 31 close to the lower portion of the valve body 1 is at a certain distance from the support bottom 45, where the certain distance between the guide rod 31 and the support bottom 45 is to satisfy that the valve core 31 can move in the axial direction along with the push rod 2; alternatively, the spool member 3 is only a spool of a steel ball structure. Therefore, the valve core 3 can reciprocate in the axial direction to open and close the valve hole, and other structures are similar to the above embodiment and are not described again.

The invention also provides an automobile air-conditioning system which comprises a compressor, a condenser, an evaporator and an expansion valve, wherein the expansion valve is of the structure in the embodiment, so that the automobile air-conditioning system adopting the expansion valve also has the technical effect of low noise.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An expansion valve comprises a valve body, a power head, a push rod, a valve core component, an adjusting bolt and an electromagnetic valve, wherein the push rod is arranged between the valve core component and the power head, the valve body further comprises a first valve chamber and a second valve chamber, at least part of the adjusting bolt is positioned in the first valve chamber, at least part of the electromagnetic valve is positioned in the second valve chamber, the upper part of the first valve chamber is provided with a valve hole, the bottom of the first valve chamber is opened and sealed by the adjusting bolt, the adjusting bolt is integrally formed by a base body, a connecting part with a diameter smaller than that of the base body and a supporting part arranged on the connecting part, the supporting part is provided with an opening part and a bottom opposite to the opening part, the expansion valve is characterized in that the valve core component comprises a valve core and a guide rod, a valve core frame is not arranged in, one end of the elastic component is abutted to the valve core, the other end of the elastic component is abutted to the bottom of the supporting part, the valve core moves towards the direction of closing the valve hole through the pre-tightening of the elastic component, and moves towards the valve opening direction of the valve hole through the push rod.

2. The expansion valve of claim 1, wherein the elastic member is a disc spring with opposing faces, the disc spring comprises a disc spring body and a bottom surface, the disc spring body is substantially frustum-shaped, the bottom surface is a planar structure, and a through hole is further formed at a substantially central position of the bottom surface.

3. The expansion valve according to claim 2, wherein the guide rod is spaced from the bottom of the adjusting bolt, one end of the guide rod passes through the through hole, the elastic component is sleeved on the periphery of the guide rod, and the elastic component is matched with the guide rod through the through hole to inhibit the lateral disturbance of the valve core component.

4. The expansion valve according to claim 2, wherein a blind hole is further formed at a substantially central position of the bottom of the adjusting bolt, one end of the guide rod passes through the through hole and is inserted into the blind hole of the adjusting bolt, the elastic component is sleeved on the periphery of the guide rod, and the elastic component is matched with the guide rod through the through hole to suppress lateral disturbance of the valve core component.

5. An expansion valve according to any of claims 1-4, wherein the belleville spring at the end of the elastic member adjacent to the adjusting bolt abuts or abuts against the bottom of the adjusting bolt to support the belleville spring, the bottom surface of the belleville spring at the end of the elastic member adjacent to the valve element abuts or abuts against the valve element, the valve element is at least partially located in the through hole, and the diameter of the valve element is not less than the inner diameter of the through hole.

6. An expansion valve according to claim 5, wherein the valve element, the guide rod and the push rod are integrally formed.

7. An expansion valve according to claim 6, wherein the inner diameter of the through-hole in the bottom surface of the belleville spring is slightly larger than the diameter of the guide rod.

8. An expansion valve comprises a valve body, a power head, a push rod, a valve core component, an adjusting bolt and an electromagnetic valve, wherein the push rod is arranged between the valve core component and the power head, the valve body further comprises a first valve chamber and a second valve chamber, at least part of the adjusting bolt is positioned in the first valve chamber, at least part of the electromagnetic valve is positioned in the second valve chamber, the upper part of the first valve chamber is provided with a valve hole, the bottom of the first valve chamber is opened and sealed by the adjusting bolt, the adjusting bolt is integrally formed by a base body, a connecting part with a diameter smaller than that of the base body and a supporting part arranged on the connecting part, the supporting part is provided with an opening part and a bottom opposite to the opening part, the expansion valve is characterized in that the valve core component is a core body with a steel ball structure, a valve core frame is not arranged in the valve chamber, an elastic component is, the butterfly spring comprises a butterfly spring body and a bottom surface, the butterfly spring body is approximately in a frustum shape, the bottom surface is of a plane structure, a through hole is further formed in the position, approximately, of the center of the bottom surface, the butterfly spring, close to one end of the adjusting bolt, of the elastic assembly is abutted or abutted against the bottom of the adjusting bolt to support the butterfly spring, the bottom surface of the butterfly spring, close to one end of the valve core component, of the elastic assembly is abutted or abutted against the valve core, the valve core component moves in the direction of closing the valve hole through the elastic assembly in a pre-tightening mode, and moves in the valve opening direction of the valve hole through the push rod.

9. An automotive air conditioning system comprising a condenser, an evaporator and an expansion valve, wherein the expansion valve is a thermostatic expansion valve according to claim 6 or 7 or 8.