Electric pilot valve for pressure reducing valve

Abstract

The electric pilot valve comprises a driving motor, a shell and a valve body which are fixedly connected in sequence, a screw rod, a nut and a telescopic spring are arranged in the shell, one end of the screw rod is connected with an output shaft of the driving motor, a threaded opening is formed in one end of the nut, a cavity communicated with the threaded opening is formed in the nut, and the telescopic spring is arranged in the cavity. The other end of the screw penetrates through the threaded opening and then extends into the cavity, the nut is in threaded connection with the screw through the threaded opening, the screw is sleeved with the telescopic spring, the two ends of the telescopic spring abut against the bottom of the cavity and the valve body respectively, so that the telescopic spring is driven to stretch out and draw back through movement of the nut, and the valve body is communicated with the pressure reducing valve. The valve body controls opening and closing of the pressure reducing valve through the elastic force of the telescopic spring, and then the fluid pressure in the fluid pipeline is controlled. The electric pilot valve for the pressure reducing valve is convenient to operate and high in pressure control precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid pressure control technical field, concretely relates to a kind of electric pilot valve for pressure reducing valve. BACKGROUND

[0002] Pressure reducing valve is by adjusting, import pressure is reduced to the outlet pressure needed, and rely on the energy of medium itself, makes the outlet pressure automatic and keeps stable, by changing throttling area, the velocity of flow and the kinetic energy of fluid change, cause different pressure loss, to reach the purpose of pressure reduction.

[0003] Pressure reducing valve is widely applied in the field of fluid pipeline pressure control;The pressure of pressure reducing valve is mainly adjusted by adjusting the pilot valve arranged on pressure reducing valve, and the current conventional pilot valve adjusting method is that staff uses wrench to twist the adjusting bolt on pilot valve, adjusts the opening and closing of pilot valve by bolt pressing spring, and then adjusts pressure reducing valve;However, manual pressure control mainly depends on the experience of staff, and the precision is not high and the labor intensity is large. SUMMARY

[0004] Therefore, the utility model provides a kind of electric pilot valve for pressure reducing valve to solve the technical problems in prior art.

[0005] The utility model provides a kind of electric pilot valve for pressure reducing valve for adjusting the pressure of pressure reducing valve on fluid pipeline, including drive motor, shell, valve body that fixed connection in proper order, the screw rod, nut, telescopic spring are equipped in the shell, one end of the screw rod is connected with the output shaft of drive motor, the drive motor is used to drive the rotation of screw rod, the nut one end is equipped with screw opening, the nut is equipped with the cavity that is communicated with the screw opening, the other end of the screw rod extends to the cavity after passing through the screw opening, the nut is connected with the screw rod by screw opening, to drive the nut in the shell along shell axial movement by the rotation of screw rod, the telescopic spring is set on the outside of screw rod, the both ends of telescopic spring are respectively abutted on the bottom of cavity and valve body, to drive the telescopic spring telescopic by the movement of nut, the valve body is communicated with the pressure reducing valve, the valve body controls the opening and closing of the pressure reducing valve by the elastic force of telescopic spring, and then the fluid pressure in the fluid pipeline is controlled.

[0006] The utility model discloses an electric pilot valve for pressure reducing valve, including drive motor, casing, valve body that fixed connection in proper order, be equipped with screw rod, nut, telescopic spring in the casing, one end of screw rod is connected with the output shaft of drive motor, drive motor is used for driving screw rod rotation, nut sets up in the casing, and nut is connected through the thread opening of top with screw rod, so as to drive nut in the casing axial movement along the casing through the rotation of screw rod, telescopic spring is sleeved on the outside of screw rod, and the outer diameter of telescopic spring is greater than the inner diameter of thread opening, and the both ends of telescopic spring are respectively abutted on the cavity bottom of nut and valve body, when nut moves up and down, will compress telescopic spring, and then adjust the opening and close of pressure reducing valve through valve body, control the fluid pressure in fluid pipeline.

[0007] Preferably, a protective cover is sleeved on the outside of the drive motor, the protective cover includes a cover body sleeved on the casing and a cap connected with the cover body.

[0008] Preferably, the drive motor is fixedly connected with the casing through a motor flange, and an elastic sealing ring is arranged between the motor flange and the casing.

[0009] Preferably, the casing includes, in sequence from the direction away from the drive motor, an avoiding groove with gradually increasing inner diameter, a containing groove, and a containing cavity, the avoiding groove is used for avoiding the output shaft of the drive motor, a bearing is arranged in the containing groove, and the nut is arranged in the containing cavity.

[0010] Preferably, an annular protrusion is arranged on the screw rod, and the both ends of the bearing are abutted on the bottom end of the containing groove and the end face of the annular protrusion.

[0011] Preferably, a guide pin hole is arranged on the side surface of the casing, a guide groove adapted to the guide pin hole is arranged on the side surface of the nut along the axial direction of the nut, a guide pin is arranged in the guide pin hole and is in sliding connection with the guide groove, and the nut moves axially in the casing through the guide pin hole, the guide groove, and the guide pin.

[0012] Preferably, a gasket is arranged between the casing and the valve body, and a limiting protrusion extending into the telescopic spring is fixedly connected in the middle of the gasket.

[0013] Preferably, the drive motor is electrically connected with a controller through a wire, and the controller is used for adjusting the number of rotation of the drive motor, and then adjusting the movement stroke of the nut.

[0014] Preferably, the electric pilot valve further includes a limiting component disposed on one side of the drive motor, the limiting component being used to limit the upper limit and lower limit of the stroke of the nut within the housing along the housing axial direction.

[0015] Preferably, the limiting component includes a limiting switch connected to the end of the housing, the limiting switch being used to limit the number of rotations of the drive motor, and an indicator rod that moves with the nut is provided between the limiting switch and the nut.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the electric pilot valve used for the pressure reducing valve in this embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure after removing the protective cover and controller;

[0019] Figure 3 for Figure 2 A schematic diagram of the exploded structure;

[0020] Figure 4 for Figure 1 Schematic diagram of the structure of the middle nut;

[0021] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of the middle nut;

[0022] Figure 6 for Figure 1 Schematic diagram of the middle shell structure;

[0023] Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure of the middle shell.

[0024] Explanation of key component symbols:

[0025] 10, drive motor; 11, output shaft; 12, motor flange; 13, elastic sealing ring; 20, housing; 21, screw; 211, annular protrusion; 22, nut; 221, threaded opening; 222, cavity; 223, guide groove; 224, connecting hole; 23, telescopic spring; 24, connecting flange; 25, avoiding slot; 26, accommodating slot; 27, accommodating cavity; 28, bearing; 29, guide pin hole; 291, guide pin; 30, valve body; 31, gasket; 32, limiting protrusion; 40, protective cover; 41, cover body; 42, cap; 50, controller; 60, limiting assembly; 61, limiting switch; 62, identification rod.

[0026] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments of the present application, and is not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0030] Specifically, as shown in FIG. 1, the present application comprises a drive motor 10, an output shaft 11, a motor flange 12, an elastic sealing ring 13, a housing 20, a screw 21, a nut 22, a telescopic spring 23, a connecting flange 24, a valve body 30, a gasket 31, a limiting protrusion 32, a protective cover 40, a cover body 41, a cap 42, a controller 50, a limiting assembly 60, a limiting switch 61, and an identification rod 62. Figures 1 to 7As shown in the utility model embodiment, the electric pilot valve for the pressure reducing valve is used for adjusting the pressure of the pressure reducing valve on the fluid pipeline, and comprises a driving motor 10, a shell 20 and a valve body 30 which are fixedly connected in sequence, the shell 20 is internally provided with a screw rod 21, a nut 22 and an extension spring 23, one end of the screw rod 21 is connected with an output shaft 11 of the driving motor 10, the driving motor 10 is used for driving the screw rod 21 to rotate, one end of the nut 22 is provided with a threaded opening 221, the nut 22 is internally provided with a cavity 222 which is communicated with the threaded opening 221, the other end of the screw rod 21 extends into the cavity 222 after passing through the threaded opening 221, the nut 22 is threadedly connected with the screw rod 21 through the threaded opening 221, so as to drive the nut 22 to move in the shell 20 along the shell axial direction through the rotation of the screw rod 21, the extension spring 23 is sleeved outside the screw rod 21, and the two ends of the extension spring 23 are respectively abutted against the bottom of the cavity 222 and the valve body 30, so as to drive the extension spring 23 to extend and contract through the movement of the nut 22, the valve body 30 is communicated with the pressure reducing valve, the valve body 30 controls the opening and closing of the pressure reducing valve through the elastic force of the extension spring 23, and then the fluid pressure in the fluid pipeline is controlled.

[0031] Optionally, in the embodiment, the electric pilot valve is arranged on the pressure reducing valve through the valve body 30 and is communicated with the pressure reducing valve, as shown in Figure 3 As shown, the driving motor 10, the shell 20 and the valve body 30 are arranged from top to bottom in sequence, the upper end of the screw rod 21 is connected with the output shaft 11 of the driving motor and rotates coaxially, as shown in Figure 4 and Figure 5 As shown, the nut 22 is a U-shaped nut, the U-shaped opening faces downward, the threaded opening 221 is arranged above the U-shaped nut, the lower end of the screw rod 21 extends into the middle cavity after passing through the threaded opening 221, the driving motor 10 is a speed reducer, the driving motor 10 drives the screw rod 21 to rotate, the screw rod 21 drives the nut 22 to move up and down, the extension spring 23 is sleeved outside the screw rod 21, the outer diameter of the extension spring 23 is greater than the inner diameter of the threaded opening 221, the two ends of the extension spring 23 are respectively abutted against the bottom of the cavity of the U-shaped nut and the valve body, the extension spring 23 is compressed when the nut moves up and down, and then the opening and closing of the pressure reducing valve are adjusted through the valve body 30, and the fluid pressure in the fluid pipeline is controlled. The electric pilot valve for the pressure reducing valve provided in the embodiment is electrically controlled through the driving motor 10, the rotation of the output shaft of the driving motor 10 is converted into the up and down movement of the nut through the screw rod 21, the extension amount of the extension spring 23 is controlled through the nut, and then the pressure of the pressure reducing valve is adjusted; the fluid pipeline pressure control precision is high, and is suitable for wide range promotion.

[0032] Optionally, in the embodiment, as shown in Figure 1As shown, the outer side of the driving motor 10 is sleeved with a protective cover 40, which comprises a cover body 41 sleeved on the shell 20 and a cap 42 connected with the cover body 41. Preferably, the cover body 41 is threadedly connected with the cap 42. The driving motor 10 is fixedly connected with the shell 20 through a motor flange 12, and an elastic sealing ring 13 is arranged between the motor flange 12 and the shell 20. Further, the motor flange 12 is fixedly connected with the driving motor 10 through bolts. The two ends of the shell 20 are both outwardly extended with a connecting flange 24, and the motor flange 12 can be fixedly connected with the connecting flange 24 at the upper end of the shell through bolts.

[0033] Optionally, in the embodiment, as shown in Figure 6 and Figure 7 , the shell 20 comprises, from top to bottom, a gradually-increased-internal-diameter avoiding groove 25, a containing groove 26 and a containing cavity 27. The avoiding groove 25, the containing groove 26 and the containing cavity 27 are throughly arranged. The avoiding groove 25 is used for avoiding the output shaft 11 of the driving motor 10. The containing groove 26 is provided with a bearing 28, and the nut 22 is arranged in the containing cavity 27. Preferably, the bearing 28 is a ball bearing. Figure 3 Further, the screw rod 21 is provided with an annular protrusion 211, and the two ends of the bearing 28 are respectively abutted against the bottom end of the containing groove 26 and the end face of the annular protrusion 211. That is, the annular protrusion 211 provides support for the bearing 28, so that the bearing is limited in the containing groove 26.

[0034] Optionally, as shown in Figures 3 to 7 , the side of the shell 20 is provided with a guide pin hole 29, the side of the nut 22 is provided with a guide groove 223 along the axial direction of the nut 22, the guide pin hole 29 is provided with a guide pin 291 which is slidably connected with the guide groove 223. The nut 22 moves along the axial direction of the shell in the shell through the guide pin hole 29, the guide groove 223 and the guide pin 291. After the guide pin 291 is inserted into the guide pin hole 29, it abuts against the surface of the guide groove 223, so that the nut 22 can only move along the axial direction of the containing cavity 27 and cannot rotate. Optionally, the guide pin hole 29, the guide groove 223 and the guide pin 291 can be two pairs which are symmetrically arranged on the side of the shell 20. Further, the shell 20 and the valve body 30 are provided with a gasket 31 which is fixedly connected with a limiting protrusion 32 extending into the telescopic spring 23. The valve body 30 is fixedly connected with the lower end of the shell through bolts and the connecting flange of the shell. The lower end of the telescopic spring 23 abuts against the step of the limiting protrusion 32.

[0035] Optionally, the driving motor 10 is electrically connected with the controller 50 through wires, the controller 50 is used for adjusting the rotation number of the driving motor 10, and then adjusting the up and down movement stroke of the nut 22, the controller can be communicated and connected with a terminal such as a mobile phone through wireless or Bluetooth technology, and then the motor operation parameter of the controller is directly set through the terminal such as the mobile phone; preferably, the electric pilot valve further comprises a limiting assembly 60 arranged on one side of the driving motor 10, the limiting assembly 60 is used for limiting the upper limit and the lower limit of the stroke of the nut 22 in the axial movement of the shell 20; optionally, the limiting assembly 60 comprises a limiting switch 61 fixedly connected with the upper end of the shell 20, the limiting switch 61 is used for controlling the positive rotation number and the negative rotation number of the driving motor, so as to control the upper limit and the lower limit of the stroke of the nut 22, and then limit the upper limit and the lower limit of the stroke of the extension spring 23; in the specific implementation, the nut 22 presses down the extension spring 23, the opening and closing of the pilot valve is increased, and then the excess flow of the pressure reducing valve is increased, when the extension spring 23 reaches the lower limit, the pilot valve is fully opened and closed, and the excess flow of the pressure reducing valve is maximum; the side surface of the nut 22 is provided with a connecting hole 224 along the axial direction thereof, a marker rod 62 is arranged between the limiting switch 61 and the nut 22, the marker rod 62 is threadedly connected with the connecting hole 224, and the marker rod 62 moves up and down with the nut 22, and is used for marking the extension amount of the extension spring 23.

[0036] In summary, the electric pilot valve for the pressure reducing valve provided by the utility model, including driving motor 10, shell 20, valve body 30 that fixed connection in turn, shell 20 inside is equipped with screw rod 21, nut 22, extension spring 23, one end of screw rod 21 is connected with the output shaft 11 of driving motor 10, driving motor 10 is used to drive screw rod 21 rotates, nut 22 is arranged in shell 20, nut 22 is threadedly connected with screw rod 21 through the thread opening 221 in the top, to drive nut 22 in shell 20 along the axial movement of shell through the rotation of screw rod 21, extension spring 23 is set on the outside of screw rod 21, the outer diameter of extension spring 23 is greater than the inner diameter of thread opening 221, the both ends of extension spring 23 are respectively abutted on the cavity bottom of nut and valve body, when nut moves up and down, will compress extension spring 23, and then adjust the opening and closing of pressure reducing valve through valve body 30, control the fluid pressure in fluid pipeline. The present application converts the rotation of the output shaft of the driving motor 10 into the up and down movement of the nut through the screw rod 21, controls the extension amount of the extension spring 23 through the nut, and then adjusts the pressure of the pressure reducing valve, so that the pressure control precision in the fluid pipeline is high, and the utility model is suitable for wide range of popularization.

[0037] It should be noted that the above implementation process is only for the purpose of illustrating the feasibility of the present application, but it does not mean that the electric pilot valve for the pressure reducing valve of the present application only has the above implementation process, on the contrary, as long as the electric pilot valve for the pressure reducing valve of the present application can be implemented, it can be included in the feasible implementation scheme of the present application.

[0038] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The above embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, under the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electrically operated pilot valve for use in a pressure reducing valve, used to adjust the pressure of a pressure reducing valve on a fluid pipeline, characterized in that, The device includes a drive motor, a housing, and a valve body, which are fixedly connected in sequence. The housing contains a screw, a nut, and a telescopic spring. One end of the screw is connected to the output shaft of the drive motor, which drives the screw to rotate. One end of the nut has a threaded opening, and a cavity communicating with the threaded opening is located inside the nut. The other end of the screw passes through the threaded opening and extends into the cavity. The nut is threadedly connected to the screw through the threaded opening, so that the rotation of the screw drives the nut to move axially within the housing. The telescopic spring is sleeved on the outside of the screw, with its two ends abutting against the bottom of the cavity and the valve body, respectively. The movement of the nut causes the telescopic spring to extend and retract. The valve body communicates with a pressure-reducing valve, and the valve body controls the opening and closing of the pressure-reducing valve through the elastic force of the telescopic spring, thereby controlling the fluid pressure in the fluid pipeline.

2. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The drive motor is fitted with a protective cover, which includes a cover body fitted onto the housing and a cap connected to the cover body.

3. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The drive motor is fixedly connected to the housing via a motor flange, and an elastic sealing ring is provided between the motor flange and the housing.

4. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The housing includes, in sequence, a clearance groove, a receiving groove, and a receiving cavity with gradually increasing inner diameter along the direction away from the drive motor. The clearance groove is used to avoid the output shaft of the drive motor. The receiving groove is provided with a bearing, and the nut is located in the receiving cavity.

5. The electrically operated pilot valve for a pressure reducing valve according to claim 4, characterized in that, The screw is provided with an annular protrusion, and the two ends of the bearing abut against the bottom end of the receiving groove and the end face of the annular protrusion, respectively.

6. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The side of the housing is provided with a guide pin hole, and the side of the nut is provided with a guide groove along its axial direction that is adapted to the guide pin hole. The guide pin hole is provided with a guide pin that is slidably connected to the guide groove. The nut moves along the axial direction of the housing within the housing through the guide pin hole, the guide groove and the guide pin.

7. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, A gasket is provided between the housing and the valve body, and a limiting protrusion extending into the telescopic spring is fixedly connected in the middle of the gasket.

8. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The drive motor is electrically connected to the controller via wires. The controller is used to adjust the number of rotations of the drive motor, thereby adjusting the travel of the nut.

9. The electrically operated pilot valve for a pressure reducing valve according to claim 1, characterized in that, The electric pilot valve also includes a limiting component located on one side of the drive motor. The limiting component is used to limit the upper and lower limits of the stroke of the nut within the housing along the housing axis.

10. The electrically operated pilot valve for a pressure reducing valve according to claim 9, characterized in that, The limiting component includes a limiting switch connected to the end of the housing. The limiting switch is used to limit the number of rotations of the drive motor. An indicator rod that moves with the nut is provided between the limiting switch and the nut.

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