CN201874801U - Hydraulic drill pump valve compression device - Google Patents

Abstract

The utility model discloses a hydraulic drilling pump valve pressing device. A plug is arranged at the inner end of the discharge valve outlet in the main body of the hydraulic cylinder, a valve cover is arranged at the outlet end of the discharge valve, and a piston is set in the inner cavity of the valve cover. Body, the inner end of the piston body and the inner end of the valve cover are in contact with the outer end surface of the plug at the same time, and the outer end of the piston body is equipped with a plug; The two circumferential surfaces of the protruding edge maintain a clearance fit, and a sealing ring is installed on the two contacting circumferential surfaces of the piston body and the valve cover set, and a sealing cavity is formed between the two sealing rings; on the round wall of the valve cover along the axial direction A hydraulic hole is opened, and the hydraulic hole is inwardly connected with the sealing cavity, and a hydraulic oil nipple is arranged at the outlet of the hydraulic hole. The pre-tightening force of the device of the utility model can be freely controlled, the pre-tightening is reliable, the service life is long, the installation and maintenance are simple, and the working efficiency is high.

Description

Hydraulic drilling pump valve pressing device

technical field

The utility model belongs to the technical field of oil drilling rig equipment, and relates to a hydraulic drilling pump valve pressing device.

Background technique

The valve assembly (including the discharge valve assembly and the suction valve assembly) currently used on the drilling pump is compressed by tightening the connection thread between the valve cover (or cylinder cover) and the hydraulic cylinder. Tap the valve cover (or cylinder head) manually to tighten the thread to achieve the purpose of pressing the discharge valve assembly (or suction valve assembly). Because this structure relies on manual beating to tighten the valve cover (or cylinder head), the pre-tightening force cannot be controlled, the pre-tightening effect is unreliable, and the service life is short; in addition, this connection method requires laborious installation and maintenance, and the labor intensity of workers is high. .

Contents of the invention

The purpose of this utility model is to provide a hydraulic drilling pump valve pressing device, which solves the problem in the prior art that the valve cover needs to be tightened by manual beating, the pre-tightening force cannot be controlled, and the pre-tightening effect is unreliable. Short service life; laborious installation and maintenance, and high labor intensity for workers.

The technical solution adopted by the utility model is a hydraulic drilling pump valve pressing device, a plug is provided at the outlet end of the discharge valve in the main body of the hydraulic cylinder, a valve cover is provided at the outlet end of the discharge valve, and a valve cover is provided at the outlet of the valve cover. The inner cavity is set with a piston body, the inner end of the piston body and the inner end of the bonnet are in contact with the outer end surface of the plug at the same time, and the outer end of the piston body is installed with a plug; the upper and lower inner circular surfaces of the inner circular boss of the bonnet The two circumferential surfaces of the piston body are kept in clearance fit with the circumferential protruding edge of the piston body. The two contacting circumferential surfaces of the piston body and the valve cover set are respectively equipped with a sealing ring. A gap cavity is formed between the corners of the boss, which is called a sealing cavity; a hydraulic hole is opened in the axial direction on the round wall of the valve cover, and the hydraulic hole is connected with the sealing cavity inwardly, and the outlet of the hydraulic hole is provided with a hydraulic nozzle. .

The beneficial effect of the utility model is that the pre-tightening force of the piston body can be freely controlled, the pre-tightening is reliable, the service life is long, the installation and maintenance are simple, and the working efficiency is high.

Description of drawings

Fig. 1 is a schematic diagram of the compression structure of the existing valve body assembly;

Fig. 2 is a schematic diagram of the pressing installation structure of the valve body assembly of the present invention;

Fig. 3 is a structural schematic diagram of the device of the present invention.

In the figure, 1. Plug, 2. Hydraulic nozzle, 3. Piston body, 4. Plug, 5. Seal ring, 6. Seal chamber, 7. Valve cover, 8. Discharge valve assembly, 9. Suction valve assembly 10. Hydraulic cylinder, 11. Suction valve compression assembly, 12. Discharge valve compression assembly, 13. Hydraulic hole.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of the existing structure. The bonnet 7 (or cylinder head) must be knocked manually to tighten the thread to achieve the purpose of pressing the discharge valve assembly 8 (or the suction valve assembly 9).

As shown in Fig. 2, the device of the present invention adopts a piston structure, and utilizes the stability and reliability of hydraulic pressure to compress the valve assembly. Since the principles of the suction valve pressing assembly 11 and the discharge valve pressing assembly 12 are the same, only the discharge valve pressing assembly 12 will be described below.

As shown in Figure 3, the structure of the device of the present invention (taking the discharge valve compression assembly 12 as an example, the structure of the suction valve compression assembly 11 is consistent) is that a plug is set at the inner end of the discharge valve outlet in the main body of the hydraulic cylinder 10. Head 4, the outlet end of the discharge valve is provided with a valve cover 7, the inner cavity of the valve cover 7 is set with a piston body 3, the inner end of the piston body 3 and the inner end of the valve cover 7 are in contact with the outer end surface of the plug 4 at the same time, the piston The outer end of the body 3 is equipped with a plug 1, the bonnet 7 is connected with the hydraulic cylinder 10 through an external thread, and the bonnet 7 is connected with the plug 1 through an internal thread, so that the plug 1 presses the piston body 3 inward; the bonnet 7 The upper and lower inner circular surfaces of the inner circular boss of the piston body 3 keep a clearance fit with the two circumferential surfaces of the piston body 3, and the two contacting circumferential surfaces of the piston body 3 and the valve cover 7 are respectively equipped with a sealing ring 5 and two sealing rings. A gap cavity is formed between the sealing ring 5 and the circumferential protrusion of the piston body 3 and the corner of the inner circular boss of the valve cover 7, which is called the sealing cavity 6; The hole 13, the hydraulic hole 13 is inwardly connected with the sealing chamber 6, and the outlet of the hydraulic hole 13 is provided with a hydraulic oil nozzle 2. Sealing ring 5 selects O type ring for use. The hydraulic oil nozzle 2 can apply the required hydraulic pressure.

When the utility model device is working, the valve cover 7 is manually tightened to press the plug 4, and then a certain pressure of hydraulic oil is injected into the sealing cavity 6 through the hydraulic oil nozzle 2. The pressure is controllable. Under the action, the plug 4 is pushed to move downward again, and the discharge valve is compressed. At this time, the screw plug 1 is tightened with an inner hexagonal wrench, and then the oil pressure in the sealing chamber 6 is released. Since the plug 1 and the piston body 3 have been tightened together under high pressure, the piston body 3 cannot move upwards after the pressure is relieved and presses the plug 4 tightly all the time.

The device of the utility model realizes the free control of the size of the pre-tightening force, the pre-tightening is reliable, and the service life is prolonged; the labor intensity of workers is small during installation and maintenance, and the work efficiency is significantly improved.

Claims (2)

1. hydraulic type Drilling Pump Valve hold down gag, it is characterized in that: the expulsion valve outlet the inner in fluid cylinder (10) main body is provided with plug (4), be provided with valve gap (7) at the expulsion valve outlet end, inner chamber at valve gap (7) is set with piston body (3), the inner of the inner of piston body (3) and valve gap (7) contacts with the exterior edge face of plug (4) simultaneously, and the outer end of piston body (3) is equipped with plug (1); The interior boss platform of valve gap (7) up and down two internal circular surfaces is prominent along two circumferential surfaces maintenance Spielpassung with the circumference of piston body (3), piston body (3) contacts circumferential surface with two places of valve gap (7) suit and is separately installed with a seal ring (5), these two seal rings (5) and piston body (3) circumference prominent along and the interior boss platform corner of valve gap (7) between surround a gap cavity, be called Seal cage (6); Have a hydraulic pressure hole (13) on the round wall of valve gap (7) vertically, hydraulic pressure hole (13) inwardly are connected with Seal cage (6), and the outlet of hydraulic pressure hole (13) is provided with hydraulic pressure oil nozzle (2).

2. hydraulic type Drilling Pump Valve hold down gag according to claim 1 is characterized in that:

Described valve gap (7) is connected with fluid cylinder (10) by outside thread, and valve gap (7) is connected with plug (1) by internal thread.

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