CN211574288U

CN211574288U - Stop structure of electronic expansion valve

Info

Publication number: CN211574288U
Application number: CN201922301439.9U
Authority: CN
Inventors: 徐协斌; 陆海明
Original assignee: Hilite Automobile Technology Co ltd
Current assignee: Hilite Automobile Technology Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-09-25
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses an electronic expansion valve backstop structure, it relates to the electronic expansion valve field. The problem that the existing stop structure is large in part number and large in failure risk is solved. The technical scheme is that the valve seat comprises a valve seat, wherein a spiral groove is formed in the outer side wall of the valve seat; the sliding ring comprises a spiral part and an axial extension section, and the spiral part is arranged in the spiral groove in a sliding manner; a mandrel screw is arranged in the middle of the valve seat, one end of the mandrel screw protrudes out of the valve seat, a connecting plate is fixedly sleeved at the end part of the mandrel screw, and a rotor magnetic ring is fixedly sleeved on the connecting plate; the axial extension section penetrates through the connecting plate, and an eccentric through hole matched with the axial extension section is formed in the connecting plate; the valve seat is connected with a shell; the end of the spiral groove far away from the connecting plate is provided with a limiting end face, the mandrel screw comprises two stop states, one of the stop states is the contact of the end part of the spiral part and the limiting end face, and the other stop state is the contact of the end part of the axial extension section and the inner end wall of the shell. The utility model discloses have the advantage that reduces part quantity, simple to operate and reduce the inefficacy risk.

Description

Stop structure of electronic expansion valve

Technical Field

The utility model relates to an electronic expansion valve field, more specifically say, it relates to an electronic expansion valve backstop structure.

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 axially move up and down, so that the sizes of the through-flow sectional areas of the valve needle and the valve port are controlled.

In the refrigerating system, refrigerant enters the valve body through the refrigerant inlet and flows out of the valve body through the outlet pipe. When the valve is in a closed state, the valve needle assembly is in close contact with the valve port; when the valve is in the fully open state, the female thread runs to its highest position. If the stop structure is not provided, when the valve runs from the opening state to the closing state (or the valve is opened from the closing state to the maximum), if the stator of the stepping motor continues to drive the rotor magnetic ring to close (or open) the valve, the valve needle and the valve port (or the female thread and the sliding bearing) are blocked, and when the valve is opened reversely (or closed), the valve cannot be driven.

The stop structure of the existing scheme basically comprises three parts, namely a guide rail spring, a deflector rod and a sliding ring (the guide rail spring and the sliding ring have the same pitch and the same rotating direction). The rotor magnetic ring is fixedly connected with the mandrel screw, and the deflector rod is fixedly connected with the mandrel screw through laser welding, so that the deflector rod can rotate along with the rotor.

However, the deflector rod needs to be fixed on the mandrel screw rod through laser welding, so that the laser welding investment is increased, and the risk of insufficient welding failure exists; in addition, the rail spring needs to be fixed on the spindle and there is a risk of drop failure.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide an electronic expansion valve backstop structure, it has the advantage that reduces part quantity, simple to operate and reduce the inefficacy risk.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a stop structure of an electronic expansion valve comprises a valve seat, wherein a spiral groove is formed in the outer side wall of the valve seat;

a slip ring including a helical portion and an axially extending section, the helical portion slidably disposed within the helical groove;

a spindle screw is arranged in the middle of the valve seat, one end of the spindle screw protrudes out of the valve seat, a connecting plate is fixedly sleeved at the end of the spindle screw, and a rotor magnetic ring is fixedly sleeved on the connecting plate;

the axial extension section penetrates through the connecting plate, and an eccentric through hole matched with the axial extension section is formed in the connecting plate;

the valve seat is connected with a shell which covers the rotor magnetic ring, the connecting plate and the sliding ring;

one end, far away from the connecting plate, of the spiral groove is provided with a limiting end face, wherein the mandrel screw comprises two stop states, one is that the end part of the spiral part is in contact with the limiting end face, and the other is that the end part of the axial extension section is in contact with the inner end wall of the shell.

Furthermore, a plurality of eccentric through holes are uniformly distributed on the connecting plate.

Furthermore, the cross-sectional profile of the spiral groove is arc-shaped.

Further, the cross-sectional profile of the spiral groove is semicircular.

Further, the number of turns of the spiral part is greater than 1 and less than 2.

To sum up, the utility model discloses following beneficial effect has:

only one part that needs the installation of sliding ring among the backstop structure, and borrow the disk seat lateral wall and set up the helicla flute to can reduce part quantity, reduce the inefficacy risk, simultaneously, the sliding ring installation is simple, need not fix.

Drawings

Fig. 1 is a schematic structural diagram of a stop structure of an electronic expansion valve in an embodiment.

In the figure: 1. a valve seat; 11. a helical groove; 2. a mandrel screw; 3. a rotor magnetic ring; 4. a connecting plate; 41. an eccentric through hole; 51. a spiral portion; 52. an axially extending section; 6. a housing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Example (b):

a stop structure of an electronic expansion valve is disclosed, referring to fig. 1, which comprises a valve seat 1 and a sliding ring, wherein a spiral groove 11 is arranged on the outer side wall of one end of the valve seat 1; the slip ring comprises a spiral part 51 and an axial extension section 52, the axis of the axial extension section 52 is parallel to the axis of the valve seat 1, and the spiral part 51 is arranged in the spiral groove 11 in a sliding manner; the pitches of the spiral groove 11 and the spiral part 51 are equal, the rotating directions are the same, wherein the number of turns of the spiral part 51 is more than 1 and less than 2, the number of turns of the spiral part 51 is 1.25 in the embodiment, and the number of turns of the spiral part 51 is controlled to ensure the stability and the fluency of the sliding of the spiral part; in the axial section of the valve seat 1, the cross-sectional profile of the spiral groove 11 is circular-arc, and in the present embodiment, the cross-sectional profile of the spiral groove 11 is semicircular, which can ensure the stability of the spiral part 51.

Referring to fig. 1, a mandrel screw 2 is arranged in the middle of a valve seat 1, one end of the mandrel screw 2 protrudes out of the valve seat 1, a connecting plate 4 is fixedly sleeved at the end of the mandrel screw 2, and a rotor magnetic ring 3 is fixedly sleeved on the connecting plate 4; the mandrel screw rod 2, the connecting plate 4 and the rotor magnetic ring 3 are fixedly connected into a whole, so that the rotor magnetic ring 3 can drive the mandrel screw rod 2 to synchronously rotate; in this embodiment, the connecting plate 4 is integrally T-shaped, so that the stability of the connection between the connecting plate 4 and the mandrel screw 2 can be improved.

Referring to fig. 1, the axial extension section 52 always penetrates through the connecting plate 4, and an eccentric through hole 41 in clearance fit with the axial extension section 52 is formed in the connecting plate 4; only one eccentric through hole 41 may be arranged on the connecting plate 4, or a plurality of eccentric through holes 41 may be uniformly distributed, in this embodiment, three eccentric through holes 41 are uniformly distributed on the connecting plate 4.

Referring to fig. 1, a housing 6 for covering the rotor magnetic ring 3, the connecting plate 4 and the slip ring is fixedly connected to the valve seat 1, and the outer side wall of the rotor magnetic ring 3 is not in contact with the inner side wall of the housing 6.

Referring to fig. 1, one end of the spiral groove 11 far away from the connecting plate 4 is provided with a limit end face (not shown in the drawing); the mandrel screw 2 includes two stop states, one is that the end of the spiral part 51 contacts with the limit end face, and the other is that the end of the axial extension section 52 contacts with the inner end wall of the shell 6.

The working principle is as follows:

after the rotor magnetic ring 3 rotates, the spiral part 51 is driven by the axial extension section 52 to rotate and slide along the spiral groove 11, and when the end part of the spiral part 51 is contacted with the limiting end face, the movement is stopped, so that the spindle screw 2 is prevented from further rotating to reach a stop state; when the end of the axially extending section 52 comes into contact with the inner end wall of the housing 6, the movement is stopped, thereby preventing further rotation of the spindle screw 2 to a stop state.

The stop structure of the utility model only has one part needing to be installed by the slip ring, and the spiral groove 11 is arranged on the outer side wall of the valve seat 1, thereby reducing the number of parts and reducing the failure risk; meanwhile, the slip ring is simple to install and does not need to be fixed.

Claims

1. An electronic expansion valve backstop structure which characterized in that: the valve comprises a valve seat (1), wherein a spiral groove (11) is formed in the outer side wall of the valve seat (1);

a slip ring comprising a helical portion (51) and an axially extending section (52), the helical portion (51) being slidably arranged within the helical groove (11);

a mandrel screw rod (2) is arranged in the middle of the valve seat (1), one end of the mandrel screw rod (2) protrudes out of the valve seat (1), a connecting plate (4) is fixedly sleeved at the end of the mandrel screw rod, and a rotor magnetic ring (3) is fixedly sleeved on the connecting plate (4);

the axial extension section (52) penetrates through the connecting plate (4), and an eccentric through hole (41) matched with the axial extension section (52) is formed in the connecting plate (4);

the valve seat (1) is connected with a shell (6) which covers the rotor magnetic ring (3), the connecting plate (4) and the slip ring;

one end, far away from the connecting plate (4), of the spiral groove (11) is provided with a limiting end face, wherein the mandrel screw (2) comprises two stop states, one is that the end part of the spiral part (51) is in contact with the limiting end face, and the other is that the end part of the axial extension section (52) is in contact with the inner end wall of the shell (6).

2. The electronic expansion valve stop structure of claim 1, wherein: a plurality of eccentric through holes (41) are uniformly distributed on the connecting plate (4).

3. The electronic expansion valve stop structure of claim 1 or 2, wherein: the cross section profile of the spiral groove (11) is arc-shaped.

4. The electronic expansion valve stop structure of claim 3, wherein: the cross section profile of the spiral groove (11) is semicircular.

5. The electronic expansion valve stop structure of claim 1 or 2, wherein: the number of turns of the spiral part (51) is more than 1 and less than 2.