CN215110576U

CN215110576U - Electronic expansion valve

Info

Publication number: CN215110576U
Application number: CN202120347919.3U
Authority: CN
Inventors: 徐协斌; 黄华波; 王根
Original assignee: Hilite Automobile Technology Co ltd
Current assignee: Hilite Automobile Technology Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-12-10
Anticipated expiration: 2031-02-07

Abstract

The utility model discloses an electronic expansion valve, which comprises a valve seat and a valve needle movably arranged in the valve seat, wherein, the valve needle is provided with a guide section, and the valve seat is provided with a guide hole matched with the guide section; the bottom of the valve needle is provided with a sealing arc surface, and the guide section and the sealing arc surface are of an integrally formed structure. In this application, the guide section and the sealed arc surface integrated into one piece of needle, and the direct direction of disk seat is passed through to the needle guide section to guarantee the axiality of needle, valve port, reduce the internal leakage of valve from the design angle, guarantee refrigerating system's reliable steady operation.

Description

Electronic expansion valve

Technical Field

The utility model relates to an electronic expansion valve technical field, in particular to electronic expansion valve.

Background

The existing electronic expansion valve is generally controlled by a stepping motor to regulate the flow of a refrigerant, and comprises a driver (the stepping motor), an actuating mechanism (a thread pair), a throttling mechanism (a valve needle valve port) and related auxiliary mechanisms. The stator coil of the stepping motor receives a pulse signal provided by the controller to drive the rotor magnetic ring to rotate, and the rotor magnetic ring (integrated with the mandrel screw) rotates to drive the valve needle (integrated with the female thread) to move up and down axially, so that the through-flow sectional areas of the valve needle and the valve port are controlled to adjust the refrigerating capacity, and the efficiency of the evaporator is matched.

The electronic expansion valve generally realizes the hard sealing of the interior through the line contact of the valve needle and the valve port, when the electronic expansion valve is in a closed state, excessive refrigerant should not pass through between the valve needle and the valve port, and if the air pressure of 1Mpa is introduced into the inlet of the valve, the air flow rate of the outlet of the valve exceeds 300ml/min, internal leakage is formed. The internal leakage is generally related to the surface roughness and roundness of the valve needle and the valve port sealing surface, which is determined by the part processing technology; and also on the coaxiality of the valve needle and the valve port, which is determined by the design. The existing structure generally separates the valve needle guide section from the valve needle sealing circle, which leads to the obvious reduction of the coaxiality of the valve needle and the valve port.

SUMMERY OF THE UTILITY MODEL

Therefore, there is a need for an electronic expansion valve, which improves the coaxiality of the valve needle and the valve port and ensures the reliable and stable operation of the refrigeration system.

The utility model provides an electronic expansion valve, which comprises a valve seat and a valve needle movably arranged in the valve seat, wherein, the valve needle is provided with a guide section, and the valve seat is provided with a guide hole matched with the guide section;

the bottom of the valve needle is provided with a sealing arc surface, and the guide section and the sealing arc surface are of an integrally formed structure.

In this embodiment, the guide section and the sealed arc surface integrated into one piece of needle, and the direct direction of disk seat is passed through to the needle guide section to guarantee the axiality of needle, valve port, reduce the internal leakage of valve from the design angle, guarantee refrigerating system's reliable steady operation.

In some embodiments, the bottom of the guide hole is further provided with a crimping hole which is positioned on the same central line as the guide hole, and a valve port is arranged in the crimping hole. In this embodiment, the coaxiality of the guide hole and the valve port is ensured by the coaxial design of the guide hole and the crimping hole, and further the coaxiality of the valve needle and the valve port is ensured.

In some embodiments, the valve port top is a conical structure, and the port of the valve port top is matched with the sealing arc surface. The sealing effect is improved by the matching between the valve port and the sealing arc surface.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view illustrating the connection and detachment of a valve needle and a valve seat according to the present invention;

fig. 2 is a schematic view of the overall structure of the electronic expansion valve of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

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 all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1-2, an electronic expansion valve includes a valve seat 20 and a valve needle 10, wherein the valve needle 10 is movably disposed in the valve seat 20, a guide section 11 is disposed on the valve needle 10, and a guide hole 21 matched with the guide section 11 is disposed on the valve seat 20; the bottom of the valve needle 10 is provided with a sealing arc surface 12, and the guide section 11 and the sealing arc surface 12 are of an integrally formed structure.

In this embodiment, as shown in fig. 2, the sealing arc surface 12 is a conical structure, and forms a fit with the conical arc surface at the upper end of the valve port to realize sealing.

In this embodiment, the guide section 11 of the valve needle 10 and the sealing arc surface 12 are integrally formed, and the guide section 11 of the valve needle 10 is directly guided by the valve seat 20, so as to ensure the coaxiality of the valve needle 10 and the valve port, reduce the internal leakage of the valve from the design angle, and ensure the reliable and stable operation of the refrigeration system.

Preferably, the bottom of the guide hole 21 is further provided with a crimping hole 22 on the same center line as the guide hole 21, and the valve port 30 is arranged in the crimping hole 22. In this embodiment, the coaxiality of the guide hole 21 and the valve port 30, and thus the coaxiality of the valve needle 10 and the valve port 30, is ensured by the coaxial design of the guide hole 21 and the crimping hole 22.

Preferably, the top of the valve port 30 is a conical structure, and the top port of the valve port 30 is matched with the sealing arc surface 12. The sealing effect is improved by the matching between the valve port and the sealing arc surface 12.

In a specific application, as shown in fig. 2, after the electronic expansion valve is connected to a refrigeration system, a refrigerant enters the electronic expansion valve from an inlet of the valve body, enters the valve port 30 through the valve seat flow channel, and finally enters an outlet of the valve body from a through-flow section formed by the valve needle and the valve port. Therefore, when the electronic expansion valve is completely closed, the refrigerant can only flow into the outlet of the valve body from the O-shaped ring and the sealing line of the valve needle and the valve port. The upper conical surface of the valve port and the upper conical surface of the valve needle are in hard contact at a sealing line close to the small diameter of the conical surface to realize sealing, so the surface roughness and roundness of the conical surfaces at the positions of the valve needle and the valve port close to the sealing line directly influence the sealing effect, and the coaxiality of the valve needle and the sealing line of the valve port also directly influence the sealing effect; if the coaxiality is not good, the valve needle and the valve port sealing line can not realize complete circular contact, and the internal leakage of the valve is obviously increased. In this application, the direct crimping of valve port is on the disk seat, and the guide section and the sealed circle of needle are integrative, and the needle guide section passes through the direct direction of disk seat to guarantee the axiality of needle, valve port.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. An electronic expansion valve is characterized by comprising a valve seat and a valve needle movably arranged in the valve seat, wherein the valve needle is provided with a guide section, and the valve seat is provided with a guide hole matched with the guide section;

2. The electronic expansion valve according to claim 1, wherein the bottom of the guiding hole is further provided with a crimping hole on the same center line as the guiding hole, and the crimping hole is provided with a valve port.

3. The electronic expansion valve of claim 2, wherein the top of the valve port is tapered, and the top port of the valve port is engaged with the sealing arc surface.