Speed regulating valve

Abstract

The utility model relates to a valve body, in particular to a speed regulating valve, and solves the problem of structural design of the speed regulating valve. Comprising a valve rod, a valve body and a shell, the shell is provided with a wide opening and a narrow opening which are located on the same axis, the valve body is provided with a wide part and a narrow part, the wide part and the wide opening are sealed in an embedded mode, the narrow part and the narrow opening are sealed in an embedded mode, the valve body and the shell are in two-way blocking connection limiting in the axial direction, and a mounting hole for mounting the valve rod is formed in the valve body. A first sealing point is arranged at the position, close to the outer side of the narrow opening, of the valve body, a second sealing point is arranged at the position, close to the inner side of the narrow opening, of the valve body, and a third sealing point is arranged at the position, close to the inner side of the wide opening, of the valve body. The matching degree of parts is newly improved, and practicability and economical efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to a valve body, in particular to a speed regulating valve. Background Art

[0002] The speed regulating valve is a combination valve composed of a differential pressure reducing valve and a throttle valve in series. The throttle valve is used to adjust the flow rate, and the differential pressure reducing valve automatically compensates for the influence of load changes, so that the pressure difference before and after the throttle valve is a fixed value, eliminating the influence of load changes on the flow rate. The pressure before and after the throttle valve is respectively led to the right and left ends of the valve core of the pressure reducing valve. When the load pressure increases, the hydraulic pressure acting on the left end of the pressure reducing valve core increases, the valve core moves to the right, the pressure reducing port increases, and the pressure drop decreases, so that the pressure difference of the throttle valve remains unchanged; vice versa. In this way, the flow rate of the speed regulating valve is constant (not affected by the load). The speed regulating valve can also be designed as a structure of throttling first and then reducing pressure. The traditional structure is a six-piece set, adopting a lever and a hole-free matching seal, which has high requirements for production and processing, and the matching quality is easily affected by the processing level. Utility Model Content

[0003] Aiming at the deficiencies of the existing technology, the utility model provides a speed regulating valve.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a speed regulating valve, including a valve stem, a valve body and a shell, the shell having a wide mouth and a narrow mouth on the same axis, the valve body having a wide part and a narrow part, the wide part and the wide mouth, and the narrow part and the narrow mouth are embedded and sealed, the valve body and the shell are bidirectionally blocked and limited in the axial direction, the valve body is provided with a mounting hole for the valve stem to be installed, the valve body is provided with a sealing point one at the outer side of the narrow mouth, and the valve body is provided with a sealing point two at the inner side of the narrow mouth, the valve body is provided with a sealing point three at the inner side of the wide mouth, a sealing point four is provided between the valve stem and the wide part of the valve body, the sealing point one, the sealing point two, the sealing point three and the sealing point four are all provided with sealing rings, the sealing rings at the sealing point two and the sealing point three are close to the inner wall of the shell, and a hollow groove and a sealing sleeve placed in the hollow groove are also provided between the valve body and the inner wall of the shell.

[0005] The valve body is provided with an oblique groove at a sealing point, the groove direction of which forms an angle with the valve body axis, and the oblique groove is also provided with a clamping block protruding inward at the groove.

[0006] The sealing sleeve is in a truncated cone-shaped structure with a through middle portion, and an inclined impact slope is provided on the side of the sealing sleeve. A hollow chamber is provided inside the sealing sleeve on a side close to the impact slope.

[0007] The mounting hole is in a stepped structure, and the shape and size of the valve stem are suitable for the mounting hole.

[0008] The clamping block also has a blocking portion that blocks and limits the outer shell, and the outer diameter of the valve body at the wide portion is greater than the inner diameter of the outer shell.

[0009] The valve stem is provided with fixing sleeves for installing the sealing ring at four places of the sealing point, and the projection of the fixing sleeve in the radial direction is an I-shaped structure.

[0010] Beneficial effects of the utility model: the speed regulating valve provided by the utility model has a simplified structure, adopts the dual characteristics of sealing ring and structural sealing, improves sealing reliability, does not overly rely on processing quality, and at the same time, the structural assembly is stable, the matching degree of parts is newly improved, and it is practical and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0012] like Figure 1 As shown, a speed regulating valve comprises a valve stem 1, a valve body 2 and a shell 3, wherein the shell 3 has a wide mouth 4 and a narrow mouth 5 on the same axis, the valve body 2 has a wide portion 6 and a narrow portion 7, the wide portion 6 and the wide mouth 4, and the narrow portion 7 and the narrow mouth 5 are engaged and sealed, the valve body 2 and the shell 3 are bidirectionally blocked and limited in the axial direction, and a mounting hole 8 for the valve stem 1 is provided in the valve body 2. The wide mouth 4 and the narrow mouth 5 are related to the assembly direction of the valve stem 1, the valve stem 1 is installed from the wide mouth 4 to the narrow mouth 5, and the design of the wide mouth 4 and the narrow mouth 5 is also related to the flow direction, and the wide inlet and narrow outlet are easy to control and receive timely outlet feedback. In actual situations, the shell 3 can be a split structure, after the valve body 2, the valve stem 1 and other components are installed, other components are assembled; it can also be a split valve body 2 structure, after the two ends of the shell 3 are separately installed, the two are connected together. But it is by no means limited to this, the above are just possible implementation means.

[0013] The valve body 2 is provided with a sealing point 1 9 at the outer side of the narrow opening 5, and a sealing point 2 10 at the inner side of the narrow opening 5, and a sealing point 3 11 at the inner side of the wide opening 4. A sealing point 4 12 is provided between the valve stem 1 and the wide portion 6 of the valve body 2. The sealing points 1 9, 2 10, 3 11 and 4 12 are all provided with sealing rings. The sealing rings at the sealing points 2 10 and 3 11 are in close contact with the inner wall of the shell 3. A hollow groove 13 and a sealing sleeve 14 placed in the hollow groove 13 are also provided between the valve body 2 and the inner wall of the shell 3. The inner and outer sealing rings are provided at the connection of the narrow opening 5, which is conducive to increasing the stability of the assembly on the one hand, and improving the sealing performance on the other hand. Combined with the continuous tortuous structure of the narrow opening 5, it plays the role of a labyrinth seal. The design of the sealing sleeve 14 is due to its difference from the common ring structure, mainly to adapt to the feedback flow impact, etc., to ensure relative sealing performance.

[0014] The valve body 2 is provided with an oblique groove 15 at the sealing point 9, the notch direction of which is at an angle to the axis of the valve body 2, and the oblique groove 15 is also provided with a block 16 protruding inward at the notch. The oblique groove 15 and the block 16 can prevent the sealing ring from slipping out, and also facilitate subsequent assembly. The sealing sleeve 14 is a truncated cone structure with a through middle, and the sealing sleeve 14 is provided with an inclined impact slope 17 on the side, and the sealing sleeve 14 is provided with a cavity chamber 18 on the side close to the impact slope 17. The hollow structure is provided for the sealing sleeve 14 to be installed, and the hollowing inside the sealing sleeve 14 makes it have certain elastic properties. The impact slope 17 is more suitable for the use environment with clear flow direction and strong impact force, which improves the service life and enhances the stability of the structure.

[0015] The mounting hole 8 is a stepped structure, and the shape and size of the valve stem 1 are adapted to the mounting hole 8. That is, the multi-layer stepped structure enables the valve stem 1 and the valve body 2 to be tightly assembled, and has the effect of multi-point support.

[0016] The block 16 also has a stopper 19 for stoppering and limiting the position with the housing 3. The outer diameter of the wide portion 6 of the valve body 2 is larger than the inner diameter of the housing 3. The two make the valve body 2 stoppered and limited in the axial direction after being installed to prevent the structure from detaching. The valve stem 1 is provided with a fixing sleeve 20 for installing the sealing ring at the sealing point 24 12. The projection of the fixing sleeve 20 in the radial direction is an I-shaped structure. The fixing sleeve 20 can be an accessory of the sealing ring, or an integrated structure, which is convenient for fixing and limiting the sealing ring.

[0017] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. At the same time, the basic principles, main features and advantages of the present invention are shown and described above, which should be understood by technicians in this industry.

Claims

1. A speed regulating valve, comprising a valve stem, a valve body and a housing, characterized in that: The shell has a wide mouth and a narrow mouth on the same axis, the valve body has a wide part and a narrow part, the wide part and the wide mouth, and the narrow part and the narrow mouth are embedded and sealed, the valve body and the shell are bidirectionally blocked and limited in the axial direction, the valve body is provided with a mounting hole for the valve stem to be installed, the valve body is provided with a sealing point one at the outer side of the narrow mouth, and the valve body is provided with a sealing point two at the inner side of the narrow mouth, the valve body is provided with a sealing point three at the inner side of the wide mouth, a sealing point four is provided between the valve stem and the wide part of the valve body, the sealing points one, two, three and four are all provided with sealing rings, the sealing rings at the sealing points two and three are tightly attached to the inner wall of the shell, and a hollow groove and a sealing sleeve placed in the hollow groove are also provided between the valve body and the inner wall of the shell.

2. A speed regulating valve according to claim 1, characterized in that: The valve body is provided with an oblique groove at a sealing point, the groove direction of which forms an angle with the valve body axis, and the oblique groove is also provided with a clamping block protruding inward at the groove.

3. A speed regulating valve according to claim 1 or 2, characterized in that: The sealing sleeve is in a truncated cone-shaped structure with a through middle portion, and an inclined impact slope is provided on the side of the sealing sleeve. A cavity chamber is provided inside the sealing sleeve on a side close to the impact slope.

4. A speed regulating valve according to claim 1, characterized in that: The mounting hole is in a stepped structure, and the shape and size of the valve stem are suitable for the mounting hole.

5. A speed regulating valve as claimed in claim 2, characterized in that: The clamping block also has a blocking portion that blocks and limits the outer shell, and the outer diameter of the valve body at the wide portion is greater than the inner diameter of the outer shell.

6. A speed regulating valve as claimed in claim 1, characterized in that: The valve stem is provided with fixing sleeves for installing the sealing ring at four places of the sealing point, and the projection of the fixing sleeve in the radial direction is an I-shaped structure.

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