Pressure reducing valve

Abstract

Provided is a pressure reducing valve. The pressure reducing valve mainly solves the problems that when a conventional pressure reducing valve is used, high-flow-speed media flowing through the valve easily cause vibration, noise and the like. The inner shell (4) is arranged in the inlet cavity, part of the valve rod is arranged in the inner shell, the valve seat is arranged at the bottom of the inner shell, the circumferential wall of the inner shell comprises a first wall (41) and a second wall (42) which are arranged inside and outside, a plurality of first through grooves (411) are formed in the first wall, a plurality of second through grooves (421) are formed in the second wall, and the first through grooves (411) are communicated with the second through grooves (421). The first through grooves and the second through grooves are arranged on the same projection plane in a staggered mode. According to the pressure reducing valve, when a high-flow-speed and high-pressure medium enters the cylinder cavity from the labyrinth ring at the inlet of the valve body, the flow speed and the pressure of the medium can be effectively controlled, the high-flow-speed medium is effectively prevented from scouring and damaging parts in the cylinder, meanwhile, the final control effect is guaranteed, and the safety and the stability of the medium in the cylinder cavity are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve field, concretely relates to a pressure reducing valve. BACKGROUND

[0002] In mine operation, the spraying water of the underground spray dust reduction equipment is provided by the well, and the water pressure and flow rate of the water sent to the well are higher because many mines are deep up to hundreds or even thousands of meters, so the water must be reduced to a suitable and safe pressure to meet the requirements of the water use in the well.

[0003] The existing pressure reducing valve is damaged by the cavitation, flashing flushing, vibration, noise and the like caused by the high flow rate medium flowing through the valve during use. UTILITY MODEL CONTENTS

[0004] In order to overcome the defects in the background art, the utility model provides a pressure reducing valve, which mainly solves the problems of vibration and noise caused by the high flow rate medium flowing through the valve during use of the conventional pressure reducing valve.

[0005] The technical scheme of the utility model provides,

[0006] A pressure reducing valve, comprising a valve body and a valve rod, a valve clack is arranged in the valve body, a valve seat is arranged in the valve body opposite to the valve clack, the valve body comprises an inlet cavity and an outlet cavity, the valve body and the valve seat are matched to cut off or connect the inlet cavity and the outlet cavity, further comprising an inner shell arranged in the inlet cavity, part of the valve rod is arranged in the inner shell, the valve seat is arranged at the bottom of the inner shell, the circumferential wall of the inner shell comprises a first wall and a second wall arranged inside and outside, a plurality of first through grooves are arranged on the first wall, a plurality of second through grooves are arranged on the second wall, the first through grooves and the second through grooves are arranged alternately on the same projection plane.

[0007] Further comprising a piston assembly, the piston assembly is installed in the inner shell and is connected with the valve rod in linkage, an elastic member is arranged at the top of the piston assembly to drive the piston assembly to move downward.

[0008] The elastic member is a spring.

[0009] An adjusting screw is threadedly installed on the valve body, a movable plate is arranged in the valve body, one end of the elastic member is abutted against the movable plate, and part of the adjusting screw extends into the shell and is abutted against the top outer wall of the movable plate.

[0010] The piston assembly comprises an upper piston and a lower piston, the circumferential outer wall of the upper piston is sealingly matched with the inner wall of the inner shell, and the circumferential outer wall of the lower piston is sealingly matched with the inner wall of the inner shell.

[0011] A piston cavity is arranged between the upper piston and the lower piston, and the piston cavity is communicated with the outlet cavity.

[0012] A flow channel is arranged on the valve rod, and one end of the flow channel is communicated with the outlet cavity, and the other end is communicated with the piston cavity.

[0013] A flow guide sleeve is arranged between the upper piston and the lower piston.

[0014] A mounting hole for the valve rod to pass through is arranged at the center of the upper piston and the center of the lower piston, and a nut for fixing the upper piston is arranged at the tail end of the valve rod.

[0015] The utility model discloses a pressure reducing valve, when high flow rate high pressure medium enters the cylinder cavity from the labyrinth ring of valve body entrance, can effectively control the flow rate and pressure of medium, effectively avoid the scouring and damage of high flow rate medium to cylinder piece, guarantee final control effect simultaneously, also enhanced the security and stability of medium in cylinder cavity. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the sectional view schematic drawing of one embodiment of the utility model.

[0017] Figure 2 It is the sectional view schematic drawing of one embodiment of the utility model. Figure 1 It is the enlarged schematic drawing of A place in the middle. DETAILED DESCRIPTION

[0018] The utility model discloses further illustrate as follows: as shown in the figure, a pressure reducing valve, including valve body 1 and valve stem 2, the valve body is equipped with valve clack 3, the valve body is equipped with valve seat 11 with valve clack is opposite, the valve body includes the cavity 12 and the cavity 13, the valve body with the valve seat cooperation is used for cutting off or intercommunication the cavity and the cavity, still include inner shell 4, be located in the cavity, part valve stem is equipped in the inside of inner shell, the valve seat is equipped in the bottom of inner shell, the circumferential wall of inner shell includes the first wall 41 and the second wall 42 of inside and outside arrangement, be equipped with a plurality of first through slot 411 on the first wall, be equipped with a plurality of second through slot 421 on the second wall, the first through slot and second through slot staggered arrangement on the same projection plane. When high flow rate high pressure medium enters the cylinder cavity from the cylinder body labyrinth ring (specifically at least two side annular wall structure, the wall is equipped with first through slot and second through slot, and first through slot and second through slot are staggered, guarantee that water flow can obtain great deceleration when entering) of valve body entrance, can effectively control the flow rate and pressure of medium, effectively avoid the scour and damage of high flow rate medium to cylinder piece, guarantee the final control effect simultaneously, also enhanced the safety and stability of medium in cylinder cavity. Meanwhile, the valve clack opens or closes due to the size of outlet medium pressure, when outlet pressure P2 is less than spring setting value P, the valve clack moves down and opens. When outlet pressure P2 is greater than spring setting value P, the valve clack moves up and closes. Therefore, when the inlet pressure fluctuation does not exceed the pressure reducing ratio setting value, the outlet pressure P2 value is basically unchanged. The basic principle of pressure reducing valve is prior art, and will not be repeated.

[0019] In the embodiment, as shown in the figure, it also includes piston assembly 5, the piston assembly is installed in the inside of inner shell and is linked with valve stem, and the top of piston assembly is equipped with elastic member 6 for driving piston assembly to move downwards.

[0020] In the embodiment, as shown in the figure, the elastic member is spring.

[0021] In the embodiment, as shown in the figure, the valve body is screw-mounted with adjusting screw 7, the valve body is equipped with movable plate 71, one end of elastic member is pressed on movable plate, and part adjusting screw is inserted into shell and is pressed on the top outer wall of movable plate. Adjusting screw is used to adjust the pressure of spring to adapt to different occasions. When it is needed to adjust outlet pressure value, adjusting screw can be used to change pressure regulating spring to the required setting value. When the pressure P2 in outlet cavity and piston cavity connected by flow channel increases and exceeds the setting value P of pressure regulating spring, the piston moves upwards in cylinder body, the opening and closing of valve clack become smaller, and flow resistance increases, so that the outlet pressure P2 decreases to the setting value P. Similarly, when the outlet pressure P2 is less than the setting value P, the direction of action is opposite to the above, the piston will move downwards in cylinder body, the opening and closing of valve clack become larger, so that the outlet pressure P2 increases to the setting value P.

[0022] In the embodiment, as shown in the figure, the piston assembly comprises an upper piston 51 and a lower piston 52, the circumferential outer wall of the upper piston is in sealing cooperation with the inner wall of the inner shell, and the circumferential outer wall of the lower piston is in sealing cooperation with the inner wall of the inner shell.

[0023] In the embodiment, as shown in the figure, a piston cavity 53 is arranged between the upper piston and the lower piston, and the piston cavity is in communication with the outlet cavity. The temperature of the valve control cavity can be reduced, the heating temperature of the upper piston and the lower piston and the sealing ring during operation can be avoided from being too high, and the service life of the piston and the sealing ring is improved.

[0024] In the embodiment, as shown in the figure, a flow channel 21 is arranged on the valve rod, one end of the flow channel is in communication with the outlet cavity, and the other end of the flow channel is in communication with the piston cavity. The liquid in the outlet cavity is guided into the piston cavity through the flow channel, and the structure is simple.

[0025] In the embodiment, as shown in the figure, a flow guide sleeve 54 is arranged between the upper piston and the lower piston. The bottom end face of the flow guide sleeve is in contact with the lower piston, and the top end face of the flow guide sleeve is in contact with the upper piston, thereby playing a supporting role.

[0026] In the embodiment, as shown in the figure, the center of the upper piston and the center of the lower piston are provided with mounting holes for the valve rod to pass through, and the tail end of the valve rod is provided with a nut 25 for fixing the upper piston. The valve rod is of a variable-diameter structure, the upper piston is arranged at the small-diameter part, the top part is fixed by the nut, and the bottom part can be supported by the upper end face of the large-diameter part or the upper end face of the flow guide sleeve.

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0029] The embodiments described with reference to the drawings are exemplary and are intended to serve for the explanation of the present application and cannot be understood as a limitation of the present application. The embodiments should not be regarded as a limitation of the present application, but any improvement made on the basis of the spirit of the present application should be within the scope of protection of the present application.

Claims

1. A pressure reducing valve, comprising a valve body (1) and a valve stem (2), wherein a valve disc (3) is provided within the valve body, and a valve seat (11) is provided within the valve body opposite to the valve disc; the valve body includes an inlet chamber (12) and an outlet chamber (13), wherein the valve body and the valve seat cooperate to cut off or connect the inlet chamber and the outlet chamber, characterized in that: Also include An inner shell (4) is arranged in the inlet cavity, part of the valve stem is arranged inside the inner shell, the valve seat is arranged at the bottom of the inner shell, the circumferential wall of the inner shell comprises first wall (41) and second wall (42) arranged inside and outside, the first wall is provided with a plurality of first through slot (411), the second wall is provided with a plurality of second through slot (421), the first through slot and the second through slot are staggered in the same projection plane.

2. A pressure reducing valve according to claim 1, characterized in that: Also include piston assembly (5), the piston assembly is installed in the inside of the inner shell and is linked with the valve stem, the top of the piston assembly is provided with elastic member (6) for driving the piston assembly to move downward.

3. A pressure reducing valve according to claim 2, wherein: The elastic member is a spring.

4. A pressure reducing valve according to claim 1, wherein: The valve body is provided with adjusting screw (7) installed by screw thread, the valve body is provided with movable plate (71), one end of the elastic member is pressed on the movable plate, part of the adjusting screw is inserted into the shell and pressed on the top outer wall of the movable plate.

5. A pressure reducing valve according to any one of claims 1 to 4, characterized in that: The piston assembly comprises upper piston (51) and lower piston (52), the circumferential outer wall of the upper piston is sealed with the inner wall of the inner shell, and the circumferential outer wall of the lower piston is sealed with the inner wall of the inner shell.

6. A pressure reducing valve according to claim 5, wherein: The piston cavity (53) is arranged between the upper piston and the lower piston, and the piston cavity is communicated with the outlet cavity.

7. A pressure reducing valve according to claim 1, wherein: The valve stem is provided with flow channel (21), one end of the flow channel is communicated with the outlet cavity, and the other end is communicated with the piston cavity.

8. A pressure reducing valve according to claim 5, wherein: The upper piston and the lower piston are provided with flow guide sleeve (54).

9. A pressure reducing valve according to claim 5, wherein: The center of the upper piston and the center of the lower piston are provided with mounting hole for the valve stem to pass through, and the tail end of the valve stem is provided with nut (25) for fixing the upper piston.

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