Integrated piston valve

Abstract

The present invention relates to the field of valve technology, and discloses an integrated piston valve, including a valve body, a valve seat arranged at the outlet end of the valve body, a piston in the inner cavity of the valve body that can slide along the guide rail of the valve body, a squirrel cage connected to the front end of the piston, and a connecting plate connecting the piston to the driving shaft of a driving device. The driving shaft is controlled by the driving device to move forward and backward along the central axis of the piston valve, thereby driving the piston to move together. This piston valve uses waterproof DC motor technology, and eliminates the shaft system on the basis of the traditional piston valve, integrates the motor and the reduction box into one and both are located in the valve body, so that the overall structure of the piston valve is simplified. The friction problem caused by the need to transmit torque through a connecting rod in traditional piston valves is avoided, and the torque is naturally reduced. Moreover, since there is no connecting rod across the flow channel, the flow channel is smoother and has no effect on the flow state.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to an integrated piston valve. Background Art

[0002] A traditional piston valve works by setting a crank connecting rod between the motor and the turbine box to realize gear transmission to make the piston reciprocate. Such a piston valve has a complex and bulky structure, and the friction between the motor and the turbine box is large at the connection, which increases the torque invisibly. When the connecting rod extends from the outside of the valve body into the valve body, a water retaining ring must be set at the entry position, and the connecting rod will produce a certain resistance to the flow channel, which will affect the flow state of the fluid. Summary of the invention

[0003] The technical problem solved by the present invention is to overcome the defects of the prior art and provide an integrated piston valve which has low cost, compact and simple structure and can reduce the transmission torque.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] An integrated piston valve comprises a valve body, a valve seat arranged at the end of the valve body, and a squirrel cage which fits with the valve seat and can slide along the valve seat. A piston is connected to one end of the squirrel cage located inside the valve body. A blind cover is fitted around the outer periphery of the piston. The blind cover has a containing space inside for installing a driving device. The driving device is installed and fixed at the closed end of the blind cover. The driving shaft of the driving device is connected to the piston through a connecting plate. The driving shaft is controlled by the driving device to move forward and backward along the central axis of the piston valve, thereby driving the piston to move together.

[0006] Furthermore, the driving device includes a motor and a reduction gearbox, the motor is embedded in the reduction gearbox, the motor rotor is provided with a rotor external gear, the reduction gearbox includes an input shaft, planetary gears and an output shaft, one end of the input shaft is provided with internal teeth meshing with the rotor external gear, and the other end has external teeth meshing with the planetary gears for transmission, a plurality of planetary gears are evenly arranged around the outer tooth end of the input shaft, the output shaft is connected to a plurality of planetary gears and rotates driven by the planetary gears, the central axis of the output shaft coincides with the central axis of the piston valve, the output shaft is a hollow shaft and its hollow inner wall is provided with threads, the drive shaft is inserted into the hollow output shaft, and the outer periphery of the drive shaft is provided with external threads matching the threads on the hollow inner wall of the output shaft.

[0007] Furthermore, the external thread on the driving shaft is a trapezoidal thread.

[0008] Furthermore, the closed end of the cover has a curved surface structure.

[0009] Furthermore, the cover opening is provided with two circles of grooves, and sealing rings are installed in the grooves for contacting with the piston to form a sealing structure.

[0010] Furthermore, the sealing ring has an arc-shaped groove on the first surface facing the valve seat, the starting height of the arc-shaped groove is flush with the height of the sealing ring body, and the end height is lower than the height of the sealing ring body, the surface of the sealing ring facing the piston is the sealing surface, and the end of the sealing surface is the second surface of the sealing ring. The sealing surface is a sealing fitting structure that first convexes and then tilts between the first surface and the second surface of the sealing ring, and the end of the arc-shaped groove is connected to the sealing surface through a flat surface.

[0011] Furthermore, a vibration sensor is installed on the surface of the valve body, a noise sensor is installed on the outer surface of the driving device, and a pressure sensor is installed on the outer surface of the driving device.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1) This piston valve uses waterproof DC motor technology. On the basis of the traditional piston valve, the shaft system is eliminated, and the motor and reduction box are integrated into one and both are located in the valve body, so that the overall structure of the piston valve can be simplified;

[0014] 2) The friction problem caused by the torque transmitted through the valve shaft in the traditional piston valve is avoided. The torque is naturally reduced, and because there is no connecting rod across the flow channel, the flow channel is smoother and has no effect on the flow state;

[0015] 3) Trapezoidal threads can better convert torque into linear motion of the piston, with high force transmission efficiency;

[0016] 4) With the unique sealing ring structure design, when the valve body is closed, the water flow temporarily stored in the valve body will produce extrusion force on the arc groove of the sealing ring, so that the sealing surface further fits the piston to form an absolute sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the integrated piston valve described in Example 1 (the valve body and cover are in a cutaway state);

[0018] Figure 2 is a cross-sectional view of the integrated piston valve described in Example 1;

[0019] Figure 3 A schematic diagram of the internal structure of the driving device described in Example 1;

[0020] Figure 4 This is a structural schematic diagram of the sealing ring described in Example 1 being installed in the groove of the cover;

[0021] Figure 5 This is a schematic diagram of the structure of the sealing ring described in Example 1. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific implementation methods, wherein the accompanying drawings are only used for exemplary descriptions and represent only schematic diagrams rather than actual drawings, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0023] Example 1

[0024] like Figures 1-2 As shown, an integrated piston valve is provided, which includes a valve body 1, a valve seat 2 arranged at the end of the valve body and adapted to the inner diameter of the valve body, a squirrel cage 3 fitted with the inner circumferential surface of the valve seat 2 and capable of sliding along the valve seat, the squirrel cage 3 is circumferentially arranged with a plurality of flow holes 31 for medium to flow through, one end of the squirrel cage 3 located inside the valve body is connected with a piston 4, the outer circumference of the piston 4 is fitted around a blind cover 5, the blind cover 5 has a accommodating space inside for installing a driving device 6, the driving device 6 is fixed to the closed end of the blind cover 5 by bolts, a driving shaft 61 of the driving device 6 is connected to the piston 4 by a connecting plate 7, and the driving shaft 61 is controlled by the driving device to move forward and backward along the central axis of the piston valve, thereby driving the piston 4 to move together.

[0025] The disk surface of the connecting disk 7 has multiple hollows, and it only needs to connect the driving shaft 61 and the piston 4. The hollows can reduce the weight of the connecting disk itself, reduce the difficulty of its processing technology, and also reduce its production cost.

[0026] The squirrel cage 3 and the piston 4 both have flange end surfaces and the two flange end surfaces are in contact with each other, and the connecting plate 7 is fastened to the two flange end surfaces by bolts.

[0027] like Figure 3As shown, the driving device 6 includes a motor 62 and a reduction box 63. The motor 62 is embedded in the reduction box 63. The motor rotor 621 is provided with a rotor external gear 622. The reduction box 63 includes an input shaft 631, a planetary gear 632 and an output shaft 633. One end of the input shaft 631 is provided with an internal tooth 6311 that meshes with the rotor external gear 622, and the other end is provided with an external tooth 6312 that meshes with the planetary gear 632 for transmission. A plurality of planetary gears 632 are evenly surrounded by the external tooth end of the input shaft. The output shaft 633 is connected to the plurality of planetary gears 632 and rotates under the drive of the planetary gears. The central axis of the output shaft coincides with the central axis of the piston valve. The output shaft 633 is a hollow shaft and a thread (not shown) is arranged on its hollow inner wall. The driving shaft 61 is inserted into the hollow output shaft 633. The outer periphery of the driving shaft 61 is provided with an external thread (not shown) that matches the thread on the hollow inner wall of the output shaft. The motor is a permanent magnet DC motor. The working process of the drive device 6 is as follows: the motor 62 provides torque, which is transmitted to the drive shaft 61 through the reduction box 63. The drive shaft 61 cooperates with the reduction box output shaft 633 to convert the torque into its own linear motion. The drive shaft 61 finally drives the squirrel cage 3 to perform linear motion.

[0028] In order to increase the torque transmission ratio, the external thread on the drive shaft 61 is preferably designed as a trapezoidal thread. In fact, the drive shaft is equivalent to a trapezoidal screw, which has good strength, good centering, adjustable clearance, good process performance, and can carry a large transmission force.

[0029] The closed end of the blind cover 5 is in an arc structure, which can reduce the resistance of the medium to flow through and provide a smooth flow path for the medium. A plurality of rib plates are also provided between the outer periphery of the blind cover and the inner wall of the valve body to fix the blind cover.

[0030] When the piston slides along the cover, a gap may be generated between the piston and the cover, so it is necessary to seal the connection between the two. Specifically, a convex portion is provided inward at the mouth of the cover 5, and two circles of grooves 51 are provided on the convex portion. A sealing ring 8 is installed in the groove to contact the piston 4 to form a sealing structure.

[0031] In order to maximize the sealing effect of the above sealing structure, Figures 4-5 As shown, the present embodiment has a unique design for the sealing ring, wherein an arc-shaped groove 81 is provided on the first surface of the sealing ring 8 facing the valve seat, the height of the starting end 811 of the arc-shaped groove is flush with the height of the sealing ring body, and the height of the end 812 is lower than the height of the sealing ring body, the surface of the sealing ring facing the piston 4 is a sealing surface 82, and the end of the sealing surface is a second surface 83 of the sealing ring, and the sealing surface 82 is a sealing fitting structure that is first convex and then inclined between the first surface and the second surface of the sealing ring, and the end 812 of the arc-shaped groove is connected to the sealing surface 82 through a flat surface.

[0032] Furthermore, the inclination of the arc surface at the starting end 811 of the arc groove is greater than the inclination of the end 812, so that the arc groove as a whole becomes an irregular arc surface. When the medium fluid enters the arc groove, it will produce a greater extrusion pressure on the end of the arc groove. The extrusion force is finally transmitted to the sealing surface 82 and makes the sealing surface further fit with the piston 4, and the sealing effect is effectively enhanced.

[0033] The piston valve of this embodiment is also equipped with a variety of sensors that can monitor the working process, such as a vibration sensor installed on the surface of the valve body to measure the vibration acceleration of the valve body, a noise sensor installed on the outer surface of the drive device to monitor the noise generated by the motor, and a pressure sensor installed on the outer surface of the drive device to measure the pressure state before and after the piston valve. In addition, a flow sensor can be installed on the outer surface of the arc surface of the cover. A control box is also provided on the outer surface of the valve body for placing the acquisition control equipment of the above sensors.

[0034] This integrated piston valve uses waterproof DC motor technology. On the basis of the traditional piston valve, the shaft system is eliminated, and the motor and reduction box are integrated into one and are both arranged in the valve body. The overall structure of the piston valve is simplified while avoiding the friction problem caused by the need to transmit torque through the connecting rod in the traditional piston valve. Naturally, the torque required for the piston valve to work can be reduced. In addition, since there is no connecting rod across the flow channel, the flow channel will be smoother and will no longer have any impact on the flow state.

[0035] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An integrated piston valve, characterized in that: The closure of the valve body is provided with a valve seat at the end of the valve body, and a squirrel cage which fits with the valve seat and can slide along the valve seat. A piston is connected to one end of the squirrel cage located inside the valve body. A blind cover is fitted around the outer periphery of the piston. The blind cover has a containing space inside for installing a driving device. The driving device is fixed to the closed end of the blind cover. The driving shaft of the driving device is connected to the piston through a connecting plate. The driving shaft is controlled by the driving device to move forward and backward along the central axis of the piston valve, thereby driving the piston to move together. The driving device includes a motor and a reduction box. The motor is embedded in the reduction box. The motor rotates A rotor external gear is provided on the reducer, and the reduction box includes an input shaft, a planetary gear and an output shaft. One end of the input shaft is provided with internal teeth that mesh with the rotor external gear, and the other end is provided with external teeth that mesh with the planetary gear for transmission. A plurality of planetary gears are evenly arranged around the external tooth end of the input shaft. The output shaft is connected with a plurality of planetary gears and rotates driven by the planetary gears. The central axis of the output shaft coincides with the central axis of the piston valve. The output shaft is a hollow shaft and a thread is arranged on its hollow inner wall. The drive shaft is inserted into the hollow output shaft, and the outer periphery of the drive shaft is provided with an external thread that matches the thread on the hollow inner wall of the output shaft.

2. The integrated piston valve according to claim 1, characterized in that: The external thread on the drive shaft is a trapezoidal thread.

3. The integrated piston valve according to claim 1, characterized in that: The closed end of the cover is in an arc structure.

4. The integrated piston valve according to claim 1, characterized in that: The mouth of the cover is provided with two circles of grooves, and sealing rings are installed in the grooves to contact with the piston to form a sealing structure.

5. The integrated piston valve according to claim 4, characterized in that: The sealing ring has an arc-shaped groove on the first surface facing the valve seat, the starting height of the arc-shaped groove is flush with the height of the sealing ring body, and the end height is lower than the height of the sealing ring body. The surface of the sealing ring facing the piston is the sealing surface, and the end of the sealing surface is the second surface of the sealing ring. The sealing surface is a sealing fitting structure that first convexes and then tilts between the first surface and the second surface of the sealing ring, and the end of the arc-shaped groove is connected to the sealing surface through a flat surface.

6. The integrated piston valve according to claim 1, characterized in that: A vibration sensor is installed on the surface of the valve body.

7. The integrated piston valve according to claim 1, characterized in that: A noise sensor is installed on the outer surface of the drive device.

8. The integrated piston valve according to claim 1, characterized in that: A pressure sensor is installed on the outer surface of the driving device.

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