Electronic expansion valve

Abstract

The electronic expansion valve comprises a valve body, a valve assembly, a coil assembly and an electric control board, the valve assembly comprises a rotor, a sleeve, a valve seat and a valve needle, the rotor is located on the inner side of the sleeve, the valve seat is provided with a valve port, the valve needle is in driving connection with a rotor assembly, and the rotor can drive the valve needle to move relative to the valve port; the coil assembly is arranged on the valve body, the shell is arranged outside the coil assembly, the electric control board is installed in the shell, and the length direction of the electric control board is consistent with the axial direction of the valve needle. An installation opening is formed in the side, facing the electric control board, of the valve body, the P / T sensor is arranged in the installation opening, the P / T sensor wraps the induction body and the contact pin through the injection molding body, the injection molding body is connected with the shell in an inserted mode, the P / T sensor is conductively connected with the electric control board through the contact pin, and the cost of the electronic expansion valve can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control technical field, especially relate to a kind of electronic expansion valve. BACKGROUND

[0002] The refrigeration system includes compressor, evaporator, condenser, throttling element and reversing valve, and electronic expansion valve is usually used as throttling element. Prior art CN202010725195.1 discloses an electronic expansion valve, including valve body, rotor assembly, valve needle assembly, coil assembly and electric control board, rotor assembly is arranged in coil assembly, coil assembly is arranged on valve body, valve needle assembly is drivenly connected with rotor assembly, electric control board is arranged at one side of valve needle assembly, and the length direction of electric control board is consistent with the axial direction of valve needle assembly. The side of valve body towards electric control board is provided with installation opening for installing P / T sensor, P / T sensor is installed in installation opening, sensor installation box is arranged at installation opening, P / T sensor is arranged in sensor installation box and is conductively connected with electric control board through wire, and the cost of wire is relatively high. SUMMARY

[0003] The utility model aims at providing an electronic expansion valve, which can reduce the cost of electronic expansion valve.

[0004] The utility model provides a kind of electronic expansion valve, including valve body, valve assembly, coil assembly and electric control board, valve assembly includes rotor, sleeve, valve seat, valve needle, the rotor is located the inside of sleeve, the valve seat has valve port, valve needle is drivenly connected with rotor assembly, the rotor can drive valve needle relative to the motion of the valve port;Coil assembly is arranged on valve body, shell is arranged outside coil assembly, electric control board is installed in shell, and the length direction of electric control board is consistent with the axial direction of valve needle;The side of valve body towards electric control board is provided with installation opening, P / T sensor is arranged in installation opening, P / T sensor is covered inductive body and pin by injection molding body, injection molding body and shell form plug-in connection, P / T sensor is conductively connected with electric control board by pin.

[0005] In some embodiments, the long edge segment bottom of the shell is provided with a groove, the top of the P / T sensor injection molding body is provided with a protruding portion matched with the groove, the pin extends from the protruding portion, and the protruding portion is installed into the groove.

[0006] In some embodiments, the side of the valve body towards the electric control board is defined as a second side, the electric control board is parallel to the second side, and the pin is perpendicular to the second side.

[0007] In some embodiments, the valve assembly further includes an adapter seat, the adapter seat includes an external thread connected with the valve body, and the adapter seat is fixedly connected with the sleeve;The valve seat includes a transverse communication hole, and the valve seat is fixedly connected with the inner hole bottom of the adapter seat.

[0008] In some embodiments, the valve seat includes a large diameter stage, which is fixedly connected with the inner hole bottom of the adapter seat in interference fit.

[0009] In some embodiments, the valve assembly further includes a nut and a screw rod, the nut is fixedly connected with the adapter seat, and the outer side of the nut is matched with the upper end of the inner hole of the adapter seat.

[0010] In some embodiments, the valve needle passes through the inner hole of the adapter seat, and the valve needle is matched with the inner hole of the adapter seat.

[0011] In some embodiments, the valve needle is matched with the inner hole of the valve seat, and the gap between the valve needle and the inner hole of the valve seat is smaller than the gap between the valve needle and the inner hole of the adapter seat.

[0012] In some embodiments, the valve body includes a first interface, a second interface, a third interface and a fourth interface, the first interface and the second interface are communicated with the valve port of the valve assembly, and the third interface and the fourth interface are communicated with the P / T sensor channel; the first interface and the second interface are located on mutually perpendicular sides, and the third interface and the fourth interface are located on mutually perpendicular sides.

[0013] The electronic expansion valve of the utility model, P / T sensor is covered with induction body and pin through injection body, injection body is connected with shell through plug-in connection, P / T sensor is connected with electric control board through pin conduction, cancels wire connection and sensor electric control box and simplifies process, reduces electronic expansion valve cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the electronic expansion valve three-dimensional structure schematic diagram of the utility model embodiment;

[0015] Figure 2 It is the coil assembly, electric control board and shell exploded structure schematic diagram of the utility model embodiment Figure 1

[0016] Figure 3 It is the valve body, valve assembly and P / T sensor exploded structure schematic diagram of the utility model embodiment Figure 1

[0017] Figure 4 It is the valve assembly sectional structure schematic diagram of the utility model embodiment Figure 1

[0018] Figure 5 It is the P / T sensor and valve body connecting part structure schematic diagram of the utility model embodiment Figure 1

[0019] ​​​​Figure 6 is an embodiment of the present application Figure 1 P / T sensor and valve body connection another part structure diagram. DETAILED DESCRIPTION

[0020] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. In the drawings, the thickness of regions and layers can be exaggerated for clarity. Like reference numerals in the drawings denote like elements or components, and thus their detailed descriptions will be omitted.

[0021] The described features, structures, or characteristics can be combined in one or more implementations. In the following description, numerous specific details are provided to give a thorough understanding of implementations of the present application. One skilled in the relevant art will recognize, however, that the

[0022] Reference Figures 1 to 6 As shown, according to the embodiment of the present application, the electronic expansion valve comprises a valve body 1, a valve assembly 2, a coil assembly 3 and an electric control board 4, the valve assembly 2 is installed on the valve body 1, the coil assembly 3 is arranged outside the valve assembly 2, and the coil assembly 3 drives the valve assembly to adjust the flow. The valve assembly 2 comprises a rotor 21, a sleeve 22, a valve seat 23, a valve needle 24, a screw rod 25 and a nut 26, the rotor is located inside the sleeve, the valve seat has a valve port, the valve needle is drivingly connected with the rotor through the screw rod and the nut, and the rotor can drive the valve needle to move relative to the valve port; an outer shell 5 is arranged outside the coil assembly 3, the electric control board 4 is installed in the outer shell 5, and the length direction of the electric control board is consistent with the axial direction of the valve needle.

[0023] The valve body comprises a first interface 11, a second interface 12, a third interface 13 and a fourth interface 14, the first interface and the second interface communicate the valve port of the valve assembly, and the third interface and the fourth interface communicate the P / T sensor channel; the first interface and the second interface are located on mutually perpendicular sides, and the third interface and the fourth interface are located on mutually perpendicular sides. The first interface and the third interface are located on the same side, i.e. the first side 101, and the second interface and the fourth interface are located on the same side, i.e. the third side 103. The valve body is provided with a valve hole 104 at the top end, the valve assembly 2 is installed in the valve hole 104, the side of the valve body facing the electric control board is the second side 102, and the first side 101 and the second side 102 are mutually parallel. Two threaded studs 15 are arranged on the side of the valve body, for fixing the valve body.

[0024] The shell 5 includes a box cover 53 arranged at the mounting opening of the shell, and a side opening of the shell facilitates the installation of the electric control board 4 and other components in the shell. When the electric control board 4 and other components are installed in the shell, the box cover 51 can be installed at the opening of the shell, thereby completing the sealing of the shell 5. The box cover and the shell can be fixedly connected by clamping, or by adhesion, or by screwing. In order to improve the sealing effect between the box cover and the shell, a sealing ring can also be arranged between the box cover and the shell. The shell 5 can be integrally injection molded with the coil assembly. The shell 5 is arranged in an L shape, the coil assembly is arranged on the short side segment 51 of the shell 5, and the electric control board 4 is arranged on the long side segment 52 of the shell 5. The shell 5 is arranged in an L shape, so that the structural size of the shell can match the rotor and the electric control board 4 at the mounting position, the installation of the rotor and the electric control board 4 can be facilitated, and the problem of excessive size of the shell caused by the inconsistent length of the rotor and the electric control board 4 in the axial direction of the rotor can be avoided, so that the overall structure of the shell 5 is more compact.

[0025] The valve body is provided with a mounting opening on the side facing the electric control board, and the P / T sensor 9 is mounted in the mounting opening. The P / T sensor is covered by an injection body to cover the sensing body 91 and the pin 92. The injection body is in plug-in connection with the shell, and the P / T sensor is in conductive connection with the electric control board through the pin. The valve body 1 is provided with a detection channel at the part below the valve cavity. The sensing head 93 of the P / T sensor 9 is in communication with the sensor channel, and is used for detecting the refrigerant flowing through the sensor channel. In order to improve the sealing performance between the P / T sensor and the valve body 1, a sealing ring is arranged between the P / T sensor and the valve body 1. In this embodiment, the temperature and pressure sensing heads are spaced apart by a certain distance, are in communication with the sensor channel through different mounting openings, use multiple sealing rings to respectively ensure the sealing performance, and use a large sealing ring for secondary sealing.

[0026] The P / T sensor is covered by an injection body to cover the sensing body and the pin. The injection body is in plug-in connection with the shell, and the P / T sensor is in conductive connection with the electric control board through the pin. The wire connection and the sensor control box are cancelled, the process is simplified, and the cost of the electronic expansion valve is reduced.

[0027] The long side segment 52 of the shell 5 is in sealing connection with the top of the P / T sensor. The bottom of the long side segment of the shell is provided with a groove, the top of the injection body of the P / T sensor is provided with a protruding portion 94 matched with the groove, the pin extends from the protruding portion, and the protruding portion is installed in the groove. The P / T sensor is in screw connection with the valve body and the shell.

[0028] The electric control board is parallel to the second side surface, and the pin of the P / T sensor is perpendicular to the second side surface, so that the pin can be conveniently inserted into the circuit connection hole of the electric control board.

[0029] In the embodiment, the valve assembly 2 comprises an adapter 27, the adapter 27 comprises external threads connected with the valve body, the adapter is fixedly connected with the sleeve 22; the valve seat 23 comprises a transverse communication hole, the valve seat is fixedly connected with the bottom of the inner hole of the adapter; the valve seat 23 comprises a large-diameter stage 231, the large-diameter stage is fixedly connected with the bottom of the inner hole of the adapter in an interference fit; a nut is fixedly connected with the adapter, the outer side of the nut is matched with the upper end of the inner hole of the adapter; the valve needle 24 passes through the inner hole of the adapter, the valve needle is matched with the inner hole of the adapter; the valve needle is matched with the inner hole of the valve seat, the gap between the valve needle and the inner hole of the valve seat is smaller than the gap between the valve needle and the inner hole of the adapter, so that the valve needle is well guided; the valve assembly is connected with the valve body through the external threads of the adapter; the outer periphery of the nut comprises a guide rail and a sliding ring, the sliding ring is driven by the rotor to move along the guide rail between upper and lower stop points, so that the upper and lower movement limit positions of the valve needle are limited.

[0030] The circuit board 18 with an angle sensor is installed between the electric control board 4 and the rotor 21, the angle sensor is plugged between the electric control board 4. The circuit board 18 is clamped and fixed on the top surface of the coil assembly 3. The electric control board 4 is provided with a plugging groove, so that the installation of the circuit board 18 is facilitated, and the quick conduction connection between the circuit board 18 and the electric control board 4 is facilitated, the connection is convenient and fast, and the performance is reliable. In addition, since the circuit board 18 is directly installed on the electric control board 4, the structure for installing the circuit board 18 can be saved, the number of parts is reduced, and the assembly difficulty is reduced. The circuit board 18 can also be installed on the coil assembly 3 through a support or a screw, and after the plugging end of the circuit board 18 is plugged with the electric control board 4, the circuit board 18 is welded and fixed with the electric control board 4.

[0031] The above is only a preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Electronic expansion valve, comprising a valve body, a valve assembly, a coil assembly and an electric control board, the valve assembly comprising a rotor, a sleeve, a valve seat, a valve needle, the rotor being located inside the sleeve, the valve seat having a valve port, the valve needle being in driving connection with the rotor assembly, the rotor being capable of driving the valve needle to move relative to the valve port; the coil assembly being arranged on the valve body, an outer shell being arranged outside the coil assembly, the electric control board being installed in the outer shell, and the length direction of the electric control board being consistent with the axial direction of the valve needle; an installation opening being formed on the side of the valve body facing the electric control board, a P / T sensor being arranged in the installation opening; characterized in that, The P / T sensor is covered by an injection body, the injection body is connected with the shell by plug-in connection, and the P / T sensor is connected with the electric control board by the pin.

2. The electronic expansion valve according to claim 1, characterized in that The bottom of the long side of the shell is provided with a groove, the top of the injection body of the P / T sensor is provided with a protruding part matched with the groove, the pin extends from the protruding part, and the protruding part is installed into the groove.

3. The electronic expansion valve according to claim 1, wherein The side of the valve body facing the electric control board is defined as a second side, the electric control board is parallel to the second side, and the pin is perpendicular to the second side.

4. The electronic expansion valve according to claim 1, wherein The valve assembly further comprises an adapter seat, the adapter seat comprises external threads connected with the valve body, and the adapter seat is fixedly connected with the sleeve.

5. The electronic expansion valve according to claim 4, wherein The valve seat comprises a large-diameter stage, and the large-diameter stage is fixedly connected with the inner hole bottom of the adapter seat in interference fit.

6. The electronic expansion valve according to claim 4, wherein The valve assembly further comprises a nut and a screw rod, the nut is fixedly connected with the adapter seat, and the outer side of the nut is matched with the upper end of the inner hole of the adapter seat.

7. The electronic expansion valve according to claim 4, wherein The valve needle passes through the inner hole of the adapter seat, and the valve needle is matched with the inner hole of the adapter seat.

8. The electronic expansion valve according to claim 7, characterized in that The valve needle is matched with the inner hole of the valve seat, and the gap between the valve needle and the inner hole of the valve seat is smaller than the gap between the valve needle and the inner hole of the adapter seat.

9. The electronic expansion valve according to claim 4, wherein The valve body comprises a first interface, a second interface, a third interface and a fourth interface, the first interface and the second interface are communicated with the valve port of the valve assembly, and the third interface and the fourth interface are communicated with the P / T sensor channel; the first interface and the second interface are located on mutually perpendicular sides, and the third interface and the fourth interface are located on mutually perpendicular sides.

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