High-precision throttle valve

Abstract

The utility model relates to a high-precision throttling valve which comprises a valve body, a packing box, a valve seat, a valve rod and other parts. The valve is characterized in that large holes and small holes are formed in the outer circle of the small end of the valve body and are arranged according to certain positions and quantity. The valve rod is arranged on the valve seat, the valve rod moves up and down through a mechanism, the large end of the valve rod can shield large and small holes in the valve seat, and the throttling effect is achieved. The valve rod is characterized in that the upper end face and the lower end face of the large end of the valve rod are consistent in size, two balance holes are formed in the valve rod, and the valve rod can be always kept in a stable state in the moving process. In the moving process of the valve rod, due to the design of hole sites of the valve seat, regular and constant variable progressive increase or progressive decrease changes are kept. High-precision throttling control of the throttle valve is achieved through the structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to have the technical field of oil and natural gas drilling and mining, especially relate to the high accuracy throttle valve of oil and natural gas drilling and mining special use. BACKGROUND

[0002] With the demand of domestic oil and natural gas is higher and higher and the rapid development of social economy, the deep well drilling technology of oil and natural gas is more and more mature, the control of output, the requirement of equipment stable operation is more and more strict, and the work efficiency of oilfield site also needs to be greatly improved. The throttle valve is very important for the control of output, and high-precision flow and pressure control can significantly improve the energy utilization efficiency of the system, reduce unnecessary energy waste, and make important contributions to energy saving and emission reduction. Therefore, the oil field needs high-precision throttle valve to realize the above efficiency. The previous throttle valve needs to be adjusted by continuously adjusting the opening size of the throttle valve to try to control the output. Therefore, the throttle valve mechanism with high-precision adjustment capability is gradually favored by users.

[0003] The high-precision throttle valve disclosed in Chinese patent application publication No. CN101586694A is used in a steam-water mixing machine (beverage production equipment), the valve body has a vertical inlet and an outlet, and an O-shaped sealing ring mounting groove is opened on the inner wall of the vertical through hole. A through hole is opened in the middle of the outer sleeve, and two sides are processed into a plane. A scale line is engraved on one plane. The head of the outer sleeve is a high-precision internal thread hole, and the pitch thereof is equal to the distance between the two adjacent scale lines. The long cylindrical end face of the valve core is tightly matched with the horizontal through hole of the valve body. The right side of the long cylindrical end face is a smaller cylindrical surface, and a protractor disc is installed on the smaller cylindrical surface. The right side of the smaller cylindrical surface is a threaded column body, and a hand wheel is installed on the right side of the threaded column body. The locking disc is installed between the hand wheel and the outer sleeve. The valve core rotates one revolution, the protractor disc moves one step relative to the scale line on the outer sleeve, and the protractor disc also rotates one revolution. However, it is not stable and reliable, cannot efficiently adjust the flow, and cannot improve the precision of output control. UTILITY MODEL CONTENTS

[0004] The utility model needs to solve the technical problem to overcome the deficiencies of the above-mentioned throttle valve and provide a high-precision throttle valve. Compared with the throttle valve used earlier, the work is more stable and reliable, the flow can be efficiently adjusted, and the precision of output control is greatly improved.

[0005] In order to achieve the above-mentioned purpose, the technical scheme needed to be solved by the utility model adopts the following technical scheme:

[0006] A high-precision throttling valve comprises a valve body, a valve seat and a valve rod; the valve seat is arranged inside an outlet end of the valve body, the valve seat has an inner hole for fluid flow, and the inner hole is communicated with the outlet end of the valve body; the valve rod is arranged on the valve seat and can move relatively; characterized in that a plurality of small holes and a plurality of large holes are arranged on the valve seat, the plurality of small holes and the plurality of large holes are communicated between an inlet end of the valve body and the inner hole of the valve seat; the valve rod is moved up and down by a mechanism, and the plurality of small holes and the plurality of large holes on the valve seat are shielded by the valve rod to achieve a throttling effect.

[0007] In a preferred embodiment of the present application, the valve seat has a large-diameter section and a small-diameter section, the large-diameter section is threadedly connected with the outlet end of the valve body, the small-diameter section is clearance-fitted with the outlet end of the valve body, and the plurality of small holes and the plurality of large holes are arranged on the small-diameter section of the valve seat.

[0008] In a preferred embodiment of the present application, the plurality of small holes are arranged in a diamond shape to achieve fine adjustment of fluid; and the plurality of large holes are symmetrically arranged to pass through flow and balance internal and external pressures to achieve a stabilizing effect.

[0009] In a preferred embodiment of the present application, the plurality of small holes are divided into two groups and arranged at 180° on the small-diameter section of the valve seat; the plurality of large holes are two holes arranged at 180° on the small-diameter section of the valve seat; and each group of small holes is different from one large hole by 90°.

[0010] In a preferred embodiment of the present application, the number of small holes in each group is equal.

[0011] In a preferred embodiment of the present application, the valve rod has a large end portion which is slidably fitted with the valve seat, the large end portion has a valve rod hole which is slidably sleeved on the small-diameter section of the valve seat, and the upper and lower end faces of the large end portion are identical in size. When pressure enters the cavity, the pressure acts on the front end of the large end portion of the valve rod, and since the upper and lower areas of the front end of the large end portion of the valve rod are identical, the force is the same, the valve rod does not encounter resistance when moving in the initial position, and can be opened at low speed, so that the valve rod is not caused to rapidly pop up upward due to force change, and sudden increase of flow and influence on precision are avoided.

[0012] In a preferred embodiment of the present application, two balance holes are arranged inside the large end portion, and the two balance holes are communicated between the valve rod hole and the inlet end of the valve body. During movement of the valve rod, the force on the valve rod is always balanced, and the valve rod does not appear to be stuck during movement, so that sudden increase or decrease of flow can be avoided.

[0013] Compared with the prior art, the high-precision throttling valve of the present application has the following advantages:

[0014] The high-precision throttle valve of the utility model discloses because the valve seat adopts the big and small hole setting, and the arrangement of the small hole is according to the constant variable increment and decrement change, so that the adjustable throttle diameter obtains the fine change and realizes control. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the cross section schematic view of the high-precision throttle valve of the utility model.

[0016] Figure 2 It is the valve seat structure schematic view of the utility model;

[0017] Figure 3 It is the valve rod structure schematic view of the utility model. DETAILED DESCRIPTION

[0018] The utility model will be further described below in combination with the drawings and specific embodiments.

[0019] Referring to Fig Figures 1-3 , the high-precision throttle valve shown in the figure contains valve body 10, valve seat 20, valve rod 30.

[0020] Referring to Figure 2 , valve seat 20 has large diameter section 21 and small diameter section 22 and is provided with inner hole 23 in valve seat 20, large diameter section 21 is screwed with the outlet end 11 of valve body 10, and small diameter section 22 is clearance fit with the outlet end 11 of valve body 10. 32 small holes 201 and 2 large holes 202 are configured on small diameter section 22, and 32 small holes 201 and 2 large holes 202 communicate the inlet end 11 of valve body 10 with the inner hole 23 of valve seat 20. 2 large holes 202 are distributed on small diameter section 22 at 180 °, and 32 small holes 201 are also distributed on small diameter section 22 at 180 ° and are divided into two groups. Each group of small holes 201 is 16, and is arranged in a diamond shape.

[0021] Referring to Figure 3 , valve rod 30 has a large end 31, and the large end 31 has a valve rod hole 32 that is slidably sleeved on the small diameter section 22 of valve seat 20. The areas of the upper plane 302 and the lower plane 301 of the large end 31 are the same, so that the valve rod 30 is balanced under pressure when being opened. Two balance holes 303 are arranged in the interior of the large end 31, and the two balance holes 303 communicate the valve rod hole 32 with the inlet end 12 of valve body 10. In this way, during the movement of the valve rod 30, the valve rod is kept in a balanced state due to the action of the two balance holes 303 of the valve rod.

[0022] Referring to Figure 1 , the assembly mode of valve body 10, valve seat 20 and valve rod 30 is as follows:

[0023] The valve seat 20 is installed in the interior of the valve body 10, the valve seat 20 and the valve body 10 are connected by rotating the valve seat 20, the valve rod hole 32 of the valve rod 30 is sleeved on the small diameter section 22 of the valve seat 20, and subsequent installation of the remaining parts is carried out according to actual products.

[0024] The high-precision throttling valve provided by the utility model improves the existing throttling valve mechanism, and the valve seat 20 is arranged with large holes 202 and small holes 201, and the arrangement is according to certain positions and quantities.

[0025] Compared with the prior art, the high-precision throttling valve has the advantages that the valve seat 20 is arranged with large holes 202 and small holes 201, and the arrangement of the small holes 201 is according to constant variable increment and decrement, so that the adjustable throttling diameter can be slightly changed to realize control. Meanwhile, the valve rod 30 is designed to make the displacement of the valve rod 30 occur in a stable and unchanged environment during initial control and the whole control process, so that the flow is prevented from being out of control.

[0026] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A high-precision throttle valve comprising a valve body, a valve seat, and a valve stem; the valve seat is disposed within the outlet end of the valve body, the valve seat having an inner hole for flow, the inner hole being connected to the outlet end of the valve body; the valve stem is disposed on the valve seat and is capable of relative movement; and is characterized in that: A plurality of small holes and a plurality of large holes are provided on the valve seat, and the plurality of small holes and the plurality of large holes connect the inlet end of the valve body with the inner hole of the valve seat; the valve stem is caused to move up and down by a mechanism, so that the valve stem covers the plurality of small holes and the plurality of large holes on the valve seat, thereby achieving a throttling effect.

2. A high-precision throttle valve according to claim 1, characterized in that: The valve seat has a large diameter section and a small diameter section. The large diameter section is threadedly connected to the outlet end of the valve body, and the small diameter section is clearance-matched with the outlet end of the valve body. Several small holes and several large holes are arranged on the small diameter section of the valve seat.

3. A high-precision throttle valve according to claim 2, characterized in that: Several small holes are arranged in a diamond shape, and several large holes are arranged symmetrically.

4. A high-precision throttle valve according to claim 3, characterized in that: The plurality of small holes are divided into two groups and arranged at 180 degrees on the small diameter section of the valve seat; the plurality of large holes are divided into two groups and arranged at 180 degrees on the small diameter section of the valve seat; and the difference between each group of small holes and one large hole is 90 degrees.

5. A high-precision throttle valve according to claim 4, characterized in that: The number of holes in each group is equal.

6. A high-precision throttle valve according to any one of claims 1 to 5, characterized in that: The valve stem has a large end portion that slides with the valve seat. The large end portion has a valve stem hole that slides onto the small diameter section of the valve seat. The upper and lower end surfaces of the large end portion have the same size.

7. A high-precision throttle valve according to claim 6, characterized in that: Two balancing holes are provided inside the large end portion, and the two balancing holes connect the valve stem hole with the inlet end of the valve body.

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