CN220669834U - Electronic expansion valve - Google Patents

Abstract

The utility model discloses an electronic expansion valve, which comprises a valve seat, wherein a valve port is arranged in the valve seat, the valve port is provided with a straight-edge section, the height of the straight-edge section is H, the diameter of the straight-edge section is D, and the H satisfies the relation: h is less than or equal to 0.6mm; alternatively, the relationship of H and D satisfies: H/D is less than or equal to 0.25. The technical scheme of the utility model aims at providing a low-cost scheme for reducing and weakening cavitation noise generated by the refrigerant flowing through the electronic expansion valve.

Description

Electronic expansion valve

Technical Field

The utility model relates to the field of electronic expansion valves, in particular to an electronic expansion valve.

Background

The noise problem of the electronic expansion valve is always a concern in an air conditioning system, the noise generation mechanism of the expansion valve is complex, the noise component is more, the noise is influenced by the design of an internal flow passage of the electronic expansion valve, and the fluid can generate noise when passing through a valve port position.

Disclosure of Invention

The main purpose of the utility model is to provide an electronic expansion valve, which aims to provide a low-cost scheme for reducing and weakening cavitation noise generated by the refrigerant flowing through the electronic expansion valve.

In order to achieve the above object, the present utility model provides an electronic expansion valve, comprising: the valve seat is internally provided with a valve port, the valve port is provided with a straight-edge section, the height of the straight-edge section is H, the diameter of the straight-edge section is D, and the H satisfies the relation: h is less than or equal to 0.6mm; alternatively, the relationship of H and D satisfies: H/D is less than or equal to 0.25.

Optionally, H is more than or equal to 0.2 and less than or equal to 0.5mm.

Alternatively, 0.1.ltoreq.H/D.ltoreq.0.25.

Optionally, the valve port further comprises an upper cone opening section and a lower cone opening section, and the upper cone opening section, the straight edge section and the lower cone opening section are sequentially connected.

Optionally, the inner diameters of the upper cone opening section and the lower cone opening section are gradually widened along the direction deviating from the straight edge section.

Optionally, the maximum inner diameter of the lower cone opening section is larger than the maximum inner diameter of the upper cone opening section.

Optionally, the valve port further comprises an extension section connected to the lower cone section, and the inner diameter of the extension section is greater than or equal to the largest inner diameter of the lower cone section.

Optionally, the electronic expansion valve further comprises a first connecting pipe, wherein the first connecting pipe is connected with the extension section, and the extension section is embedded in the first connecting pipe.

Optionally, the valve seat is further internally provided with a containing cavity, the valve seat is further provided with a mounting port, the valve port is communicated with the containing cavity, the central axis of the mounting port is intersected with the central axis of the valve port, the inner diameter of the containing cavity is larger than the inner diameter of the valve port, and the inner diameter of the mounting port is larger than the inner diameter of the valve port.

Optionally, the electronic expansion valve further comprises a second connecting pipe, and the second connecting pipe is embedded in the mounting port.

Optionally, the electronic expansion valve further comprises a shell, a control assembly, a valve core and a guide sleeve, wherein the shell is connected with the valve seat to form an installation space, the control assembly, the valve core and the guide sleeve are all installed in the installation space, the control assembly is used for controlling movement of the valve core, the guide sleeve is installed on the valve core and is located in the accommodating cavity, a part of the second connecting pipe is arranged in the accommodating cavity to form an abutting section, the edge of the guide sleeve is abutted to the abutting section, and the end part of the valve core is arranged at the valve port.

Optionally, the guide sleeve comprises a conical surface section and a cylindrical section connected with the conical surface section, wherein the cylindrical section is provided with a limiting part, and the limiting part is matched with the abutting section.

According to the technical scheme, the straight edge section is arranged at the valve port, the length of the straight edge section is controlled, and in the process that the valve core is just started to be opened, bubbles generated by the flow of fluid through the straight edge section of the valve port pass through the straight edge section before being broken, so that cavitation noise generated by the flow of the refrigerant through the electronic expansion valve is reduced and weakened.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electronic expansion valve according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an embodiment of the valve seat of FIG. 1;

fig. 3 is a partial enlarged view at a in fig. 1.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The noise problem of the electronic expansion valve is always a concern in an air conditioning system, the noise generation mechanism of the expansion valve is complex, the noise component is more, and the noise is influenced by the design of an internal flow passage of the electronic expansion valve, so that the fluid can generate noise when passing through a valve port position.

Therefore, the utility model provides an electronic expansion valve, which aims to provide a low-cost scheme for reducing and weakening cavitation noise generated by the refrigerant flowing through the electronic expansion valve.

In one embodiment of the present utility model, as shown in fig. 1 to 3, the electronic expansion valve 100 includes a valve seat 600, a valve port 630 is disposed in the valve seat 600, the valve port 630 has a straight edge section 631, the height of the straight edge section 631 is H, and the diameter of the straight edge section 631 is D, where H satisfies the relationship: h is less than or equal to 0.6mm; alternatively, the relationship of H and D satisfies: H/D is less than or equal to 0.25.

In one embodiment, the valve port 630 is formed by a straight section 631.

In another embodiment, the valve port 630 includes regular segments and irregular segments.

The electronic expansion valve 100 further comprises a housing 200, a control assembly 300, and a valve core 400, wherein the housing 200 is connected with the valve seat 600 to form an installation space, the control assembly 300 and the valve core 400 are installed in the installation space, the control assembly 300 is used for controlling movement of the valve core 400, and an end portion of the valve core 400 is disposed at the valve port 630.

Under normal conditions, the valve core 400 is arranged at the valve port 630 to seal the valve port 630; however, during the process of increasing the opening degree of the valve element 400, when the refrigerant of the fluid flows through the valve port 630 from the inlet of the valve seat 600 to the outlet, since the diameter of the inner hole of the valve port 630 is much smaller than the inner diameter of the inlet, when the fluid passes through the valve port 630, particularly, the flow area at the straight edge section 631 of the valve port 630 is suddenly changed, so that the fluid is liable to generate bubbles near the straight edge section 631 of the valve port 630, and the bubbles are crushed by being pressed through the straight edge section 631, thereby generating noise.

Specifically, the electronic expansion valve 100 (Electronic Expansion Valve) is a device for controlling the flow of refrigerant in a refrigeration system. It is commonly used in air conditioning, refrigeration and chiller equipment. The main function of the electronic expansion valve 100 is to precisely adjust the flow rate of the refrigerant according to the system's needs to ensure efficient operation of the system.

The electronic expansion valve 100 monitors and regulates pressure and temperature in the refrigerant system through an electronic controller. According to the requirement of the system, the electronic controller can adjust the opening of the expansion valve in real time, so as to control the flow of the refrigerant. The accurate control can improve the energy efficiency of the system, reduce the energy consumption and ensure the stability and the reliability of the refrigeration system.

The electronic expansion valve 100 has higher accuracy and response speed than the conventional mechanical expansion valve. The system can adjust the flow of the refrigerant in real time according to the load change of the system, thereby providing better temperature control and energy utilization efficiency. In addition, the electronic expansion valve 100 has smaller volume and weight, and is suitable for various application scenes with space limitation.

The specific structure of the electronic expansion valve 100 includes the following main parts:

the control assembly 300 includes electronic controllers, solenoid valves, and sensors.

Electronic controller (Electronic Controller): the core components of the electronic expansion valve 100 are responsible for monitoring and controlling the pressure and temperature of the refrigeration system. The system is generally composed of a microprocessor, a sensor and an algorithm, can acquire working parameters of the system in real time, and can adjust the opening of the expansion valve according to a set control strategy.

Valve seat 600 (Expansion Valve Body): the valve seat 600 is an integral part of the electronic expansion valve 100 and is typically made of a metallic material. It includes an adjustable restriction for controlling the flow of refrigerant. The expansion valve seat 600 typically has an inlet through which refrigerant enters the expansion valve seat 600 and an outlet through which the refrigerant ultimately flows, and then through an adjustable restriction to control flow.

Solenoid Valve (Solenoid Valve): solenoid valves are one of the key components of the electronic expansion valve 100 for controlling the flow of refrigerant. Solenoid valves typically consist of a coil and a spool 400. When the electronic controller sends a signal, the coil generates a magnetic field that causes the valve spool 400 to open or close, thereby controlling the flow of refrigerant.

Sensor (Sensors): the sensors are an important component in the electronic expansion valve 100 for sensing and measuring the pressure and temperature of the refrigeration system. Common sensors include pressure sensors and temperature sensors. These sensors transmit real-time pressure and temperature data to an electronic controller for precise control.

Connecting Lines (Connection Lines): connection lines are used to connect the electronic expansion valve 100 with other components of the refrigeration system, such as the evaporator and condenser. These lines are typically made of metal or flexible material to ensure smooth flow of the refrigerant.

Cavitation noise of the electronic expansion valve 100 refers to noise generated when the refrigerant flows through the electronic expansion valve 100 in the refrigeration system. Such noise is often characterized as hissing or impulsive sounds.

Cavitation noise is generated due to cavitation of the refrigerant as it passes through the expansion valve. When the refrigerant passes from the high pressure region through the expansion valve into the low pressure region, the liquid portion of the refrigerant rapidly evaporates into a gas due to the sudden decrease in pressure. In this process, bubbles in the refrigerant may form and instantaneously collapse, generating noise.

Therefore, in the technical scheme of the utility model, by adopting the straight edge section 631 arranged at the valve port 630, the length of the straight edge section 631 is controlled, and in the process that the valve core 400 is just started to be opened, bubbles generated by the fluid flowing through the straight edge section 631 of the valve port 630 pass through the straight edge section 631 before being broken, so that cavitation noise generated by the refrigerant flowing through the electronic expansion valve 100 is reduced and weakened.

In the small-caliber electronic expansion valve 100, the height H of the straight edge section 631 of the valve port 630 satisfies H.ltoreq.0.6 mm. The small-caliber electronic expansion valve 100 is a small caliber in which the diameter of the valve port 630 or the diameter of the valve port 630 is closed by the end of the valve core 400, which is generally smaller than 1.8 mm. In the small-caliber scheme, H is only required to be smaller than 0.6mm, and it is easy to understand that H is more than 0 and limited by process conditions, and in the further scheme, H is more than or equal to 0.2 and less than or equal to 0.5mm. When the value of H is less than 0.5mm, the improvement of the cavitation noise can reach the corresponding range.

In the large-caliber electronic expansion valve 100, the relation of the height H of the straight edge of the valve port 630 and the diameter of the limited valve port 630 may not be satisfied with H less than or equal to 0.5mm, and at this time, only the relation of H and D is satisfied: H/D is less than or equal to 0.25. In a further aspect, 0.1.ltoreq.H/D.ltoreq.0.25, e.g., when D is 2.0mm, the diameter of the valve port 630, 0.2 mm.ltoreq.H.ltoreq.0.5 mm.

Referring to fig. 2, further, the valve port 630 further includes an upper cone section 632 and a lower cone section 633, and the upper cone section 632, the straight section 631 and the lower cone section 633 are sequentially connected. The horn mouth arrangement of the upper cone mouth section 632 and the lower cone mouth section 633 can reduce noise to a certain extent, and the arrangement of the upper cone mouth section 632 can also cooperate with the valve core 400 to seal the valve port 630, so that damage to the valve core 400 caused by right-angle end parts is avoided.

Specifically, the inner diameters of the upper cone section 632 and the lower cone section 633 are gradually increased along the direction away from the straight edge section 631. In this way, the gap between the valve seat 600 inlet and the valve element 400 and the valve port 630 can be smoothly inclined from the taper angle surfaces of the upper taper section 632 and the lower taper section 633, the gap between the upper taper section 632 and the lower taper section 633 and the end of the valve element 400 is left, and the refrigerant flowing from the upper taper section 632 to the straight section 631 of the valve port 630 does not generate a large differential pressure, so that the vibration excitation of the valve element 400 can be reduced, and the noise can be reduced.

Further, the maximum inner diameter of the lower cone section 633 is greater than the maximum inner diameter of the upper cone section 632. After the refrigerant flows from the upper cone section 632 to the straight section 631 of the valve port 630, the flow rate entering the lower cone section 633 is relatively stable, the pressure is not recovered sharply, and since the length of the lower cone section 633 is sufficiently long, the flow of the refrigerant is rectified at the lower cone section 633, and the flow rate is relatively stable.

Referring specifically to FIG. 2, the valve port 630 further includes an extension 634, the extension 634 being coupled to the lower cone 633, the extension 634 having an inner diameter greater than or equal to the largest inner diameter of the lower cone 633. The extension 634 is convenient for connection of subsequent pipelines, and the inner diameter of the extension 634 is larger than or equal to the largest inner diameter of the lower cone 633, so that the flow of the refrigerant is stable.

Referring to fig. 1, in particular, the electronic expansion valve 100 further includes a first connection pipe 700, the first connection pipe 700 is connected to the extension section 634, and the extension section 634 is embedded in the first connection pipe 700. When in installation, the pipe orifice of the first connecting pipe 700 is sleeved with the extension section 634, the extension section 634 exceeds the valve seat 600, the valve seat 600 is provided with a groove at the periphery of the outer wall of the extension section 634, and the pipe orifice of the first connecting pipe 700 can be embedded in the groove; the first connecting tube 700 and the extension 634 may be an interference fit, such that no external fasteners are required, and the material of the first connecting tube 700 may be copper as the material of the valve seat 600. Or the first connecting pipe 700 is a hose, and a fastening ring or the like is sleeved on the outer wall of the first connecting pipe 700.

Specifically, the valve seat 600 is further provided with a receiving cavity 610, the valve seat 600 is further provided with a mounting opening 620, the valve port 630 and the mounting opening 620 are both communicated with the receiving cavity 610, a central axis of the mounting opening 620 intersects with a central axis of the valve port 630, an inner diameter of the receiving cavity 610 is larger than an inner diameter of the valve port 630, and an inner diameter of the mounting opening 620 is larger than an inner diameter of the valve port 630. Fluid from the inlet, i.e., the second connection pipe 800, enters the accommodating cavity 610, the valve core 400 is controlled to move in the control assembly 300 so that the valve port 630 is opened, thereby controlling the flow rate of the refrigerant, the inner diameter of the accommodating cavity 610 is larger than the inner diameter of the valve port 630, and the inner diameter of the mounting port 620 is larger than the inner diameter of the valve port 630, so that the electronic expansion valve 100 can realize accurate refrigerant flow control, and the energy efficiency and the stability of the system are improved.

Specifically, the electronic expansion valve 100 further includes a second connection pipe 800, and the second connection pipe 800 is embedded in the mounting port 620.

Referring to fig. 3, in order to facilitate limiting the valve element 400, the electronic expansion valve 100 further includes a guide sleeve 500, the control assembly 300 is configured to control movement of the valve element 400, the guide sleeve 500 is mounted on the valve element 400 and is located in the accommodating cavity 610, wherein a portion of the second connecting pipe 800 is disposed in the accommodating cavity 610 to form an abutting section 810, an edge of the guide sleeve 500 abuts against the abutting section 810, and an end of the valve element 400 is disposed in the valve port 630. Thus, when the valve core 400 drives the guide sleeve 500 to move to abut against the abutting section 810, the valve core 400 closes the valve port 630.

Specifically, in one embodiment, the guide sleeve 500 includes a tapered section 510 and a cylindrical section 520 connected to the tapered section 510, where a transition portion between the cylindrical section 520 and the tapered section 510 forms a limiting portion 530, and the limiting portion 530 is matched with the abutting section 810.

In another embodiment, the guide sleeve 500 includes a conical surface section 510 and a cylindrical section 520 connected to the conical surface section 510, the cylindrical section 520 is provided with a limiting portion 530, and the limiting portion 530 is matched with the abutting section 810. The end of the second connecting pipe 800 is provided with a necking, so that the second connecting pipe 800 can ensure the length of the limiting part 530 arranged in the accommodating cavity 610, and the limiting part 530 of the second connecting pipe 800 realizes the limiting of the valve core 400 to close the valve port 630, so that the structure is simpler and the cost is lower.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (12)

1. An electronic expansion valve, comprising: the valve seat is internally provided with a valve port, the valve port is provided with a straight-edge section, the height of the straight-edge section is H, the diameter of the straight-edge section is D, and the H satisfies the relation: h is less than or equal to 0.6mm; alternatively, the relationship of H and D satisfies: H/D is less than or equal to 0.25.

2. The electronic expansion valve of claim 1, wherein 0.2.ltoreq.H.ltoreq.0.5 mm.

3. The electronic expansion valve of claim 1, wherein 0.1 +.h/D +.0.25.

4. The electronic expansion valve of claim 1, wherein said valve port further comprises an upper cone port section and a lower cone port section, said upper cone port section, said straight edge section and said lower cone port section being connected in sequence.

5. The electronic expansion valve of claim 4, wherein the inner diameters of said upper and lower cone segments are tapered in a direction away from said straight segment.

6. The electronic expansion valve of claim 5, wherein the largest inner diameter of said lower cone section is greater than the largest inner diameter of said upper cone section.

7. The electronic expansion valve of claim 4, wherein the valve port further comprises an extension connected to the lower cone section, the extension having an inner diameter greater than or equal to a largest inner diameter of the lower cone section.

8. The electronic expansion valve of claim 7, further comprising a first connecting tube connected to the extension segment, the extension segment being embedded within the first connecting tube.

9. The electronic expansion valve of claim 1, wherein the valve seat is further provided with a receiving cavity therein, the valve seat is further provided with a mounting port, the valve port and the mounting port are both in communication with the receiving cavity, a central axis of the mounting port intersects a central axis of the valve port, an inner diameter of the receiving cavity is larger than an inner diameter of the valve port, and an inner diameter of the mounting port is larger than an inner diameter of the valve port.

10. The electronic expansion valve of claim 9, further comprising a second connecting tube embedded in the mounting port.

11. The electronic expansion valve of claim 10, further comprising a housing, a control assembly, a valve core, and a guide sleeve, wherein the housing is connected to the valve seat to form an installation space, the control assembly, the valve core, and the guide sleeve are all installed in the installation space, the control assembly is configured to control movement of the valve core, the guide sleeve is installed on the valve core and is located in the accommodating cavity, wherein a portion of the second connecting pipe is disposed in the accommodating cavity to form an abutting section, an edge of the guide sleeve abuts against the abutting section, and an end of the valve core is disposed at the valve port.

12. The electronic expansion valve of claim 11, wherein the guide sleeve comprises a conical section and a cylindrical section connected to the conical section, the cylindrical section being provided with a stop portion, the stop portion being mated with the abutment section.