Oil injection pump pressure detection device

Abstract

The utility model relates to a pressure detection device for an oil injection pump, which comprises a nut, a welding joint, a ball head rod and a column body with a rocker arm, a through hollow cavity is formed in the rocker arm cylinder in the axial direction, threads are arranged on the inner wall of the lower portion of the hollow cavity, and the inner diameter of the threaded section of the hollow cavity is larger than that of the non-threaded section of the upper portion of the hollow cavity. The ball head rod penetrates from the lower part of the column body with the rocker arm, the ball head is clamped at a step formed by the threaded section and the non-threaded section, and the rod-shaped part penetrates through the non-threaded section of the hollow cavity of the column body with the rocker arm and then extends out; the welding joint penetrates through the nut and then is welded with the upper end face of the ball rod; the hollow cavity threaded section of the rocker arm cylinder is used for being in threaded connection with an oil outlet of an oil injection pump; the pressure gauge is installed on the nut. According to the utility model, pressure detection can be carried out on the overhauled oil filling pump in a shutdown state, and the complex situation that a compressor needs to be started to detect the oil filling pump and equipment damage and resource waste caused by starting and stopping equipment inspection in the past are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil injection pump design and relates to an oil injection pump pressure detection device. Background Art

[0002] The oil injection pump is an important part of the oil injector, which is used to inject lubricating oil into the friction parts with high-speed reciprocating motion, and use the lubricating effect of oil to reduce the wear of parts and ensure the normal operation of the machine. In industrial production, the oil injection pump is often used in piston compressors to provide lubrication for the high-speed moving piston rings to prevent the friction between the piston rings and the cavity from being damaged and then sticking, causing damage to the piston rod and affecting the normal operation of the compressor.

[0003] The oil injection pump is generally installed on the oil tank of the oil injector, and the oil is pressed into the cavity of the piston by the rotation of the camshaft. Because the oil injection pump has to overcome the compressed gas pressure at the piston end when working, the pressure level of the oil injection pump must be higher than the maximum compression pressure of the piston at this level. In actual production, due to the inability of the oil tank to be completely sealed and the cleanliness of the lubricating oil itself, some impurities often appear in the oil tank after running for a period of time. These impurities enter the pump body through the oil suction pipe, which may cause partial blockage of the oil injection pump, resulting in a decrease in the pressure of the oil injection pump, which in turn makes it impossible to pump the lubricating oil into the piston, and eventually causes damage to the piston. Therefore, when the compressor is running, it is necessary to regularly observe the oil injection through the oil cover. When the oil injector is working, it is usually necessary to rely on the on-duty personnel to observe the oil dripping. When the oil dripping is not smooth or there is no oil dripping, it is necessary to stop running immediately and overhaul the oil injection pump. After overhauling the oil injection pump, it is reinstalled on the oil tank. Before it is put into use, a pressure test is required to observe whether it can complete the oil injection work normally under the working pressure. If there is no pressure detection device, the compressor needs to be started first, and the repair result can be judged by observation after full load. If the oil drips normally, it means that the oil injection pump is qualified; if there is no oil dripping or the oil dripping is not smooth, the equipment needs to be stopped for further maintenance or even replacement of the oil injection pump. For this reason, the compressor needs to be started and stopped frequently, which is easy to cause equipment damage and waste of resources. Utility Model Content

[0004] The technical problem solved by the utility model is: to overcome the deficiencies of the prior art and to propose an oil injection pump pressure detection device, which can pressurize the oil injection pump after maintenance and know the pressure bearing capacity of the oil injection pump in advance, thereby eliminating the loss caused by starting and stopping the equipment for inspection and avoiding the operator from frequently starting and stopping the equipment.

[0005] The solution of this utility model is:

[0006] An oil injection pump pressure detection device comprises: a nut, a welding joint, a ball head rod and a rocker arm column;

[0007] A through hollow cavity is axially arranged inside the rocker arm column, a thread is arranged on the inner wall of the lower part of the hollow cavity, and the inner diameter of the threaded section of the hollow cavity is larger than the inner diameter of the upper non-threaded section; the ball head rod is a hollow structure, the ball head rod is inserted from the lower part of the rocker arm column, the ball head of the ball head rod is stuck at the step formed by the threaded section and the non-threaded section, and the rod-shaped part of the ball head rod passes through the non-threaded section of the hollow cavity of the rocker arm column and then extends out;

[0008] The welding joint passes through the nut and is welded to the upper end face of the ball head rod extending out of the non-threaded section of the hollow cavity of the rocker arm column; the threaded section of the hollow cavity of the rocker arm column is used for threaded connection with the oil outlet of the oil injection pump; the pressure gauge is installed on the nut and is located on the upper surface of the welding joint.

[0009] Preferably, a sealing gasket is placed on the upper surface of the welding joint, and the pressure gauge is located on the sealing gasket on the upper surface of the welding joint.

[0010] Preferably, the sealing gasket is a polytetrafluoroethylene gasket.

[0011] Preferably, the rod-shaped portion of the ball head rod is clearance-matched with the non-threaded section of the hollow cavity of the rocker arm column.

[0012] Preferably, the weld joint is clearance-fitted with the nut.

[0013] Preferably, two rocker arms are symmetrically arranged on the upper outer wall of the rocker arm column.

[0014] The beneficial effects of the utility model compared with the prior art are:

[0015] The utility model is simple to operate and can be used for high pressure levels (40MPa). It can perform pressure detection on the oil injection pump after maintenance in the shutdown state, avoiding the complicated situation of starting the compressor to detect the oil injection pump and the equipment damage and resource waste caused by starting and stopping the equipment for inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the oil injection pump pressure detection device of the utility model;

[0017] Figure 2 This is a top view of the oil injection pump pressure detection device. DETAILED DESCRIPTION

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 and Figure 2 As shown, the utility model is a pressure detection device for an oil injection pump, comprising a nut 1, a welding joint 2, a ball head rod 3 and a column 4 with a rocker arm.

[0020] A through hollow cavity is axially arranged inside the rocker arm column 4, and a thread is arranged on the lower inner wall of the hollow cavity. The inner diameter of the threaded section of the hollow cavity is larger than the inner diameter of the upper non-threaded section. Two rocker arms are symmetrically arranged on the upper outer wall of the rocker arm column 4; the ball head rod 3 is a hollow structure, and the ball head rod 3 is inserted from the lower part of the rocker arm column 4. The ball head of the ball head rod 3 is stuck in the step formed by the threaded section and the non-threaded section, and the rod-shaped part of the ball head rod 3 extends out after passing through the non-threaded section of the hollow cavity of the rocker arm column 4.

[0021] After passing through the nut 1, the welding joint 2 is welded to the upper end surface of the ball head rod 3 extending out of the non-threaded section of the hollow cavity of the rocker arm column 4; the threaded section of the hollow cavity of the rocker arm column 4 is used for threaded connection with the oil outlet of the oil injection pump. A sealing gasket is placed on the upper surface of the welding joint 2, and the sealing gasket is a PTFE gasket. The rod-shaped part of the ball head rod is clearance-matched with the non-threaded section of the hollow cavity of the rocker arm column. The welding joint is clearance-matched with the nut.

[0022] Rotate the rocker arm to tighten the thread, and after tightening, install the 0-40MPa pressure gauge to the nut 1. After installation, the pressure gauge is located on the upper surface gasket of the welding joint 2, and the pressure gauge can read the oil injection pump pressure.

[0023] In a specific embodiment, the nut 1 is a M20×1.5 standard joint nut, the weld joint is a Φ14 weld joint with a length of 27 mm, the ball head rod has an outer diameter of Φ8, and the rocker arm column is 80 mm long and has an outer diameter of Φ20. The unit of diameter is mm.

[0024] The working principle of the utility model is as follows:

[0025] Manually operate the crank of the oiler to perform pressure testing on the repaired oil pump. During the shaking process, due to the presence of air in the ball rod pipeline, the oil pump pressure cannot be increased or maintained. At this time, it is necessary to loosen the rocker arm with the rocker arm column to bleed the air, tighten it after bleed and continue shaking to pressurize.

[0026] If the pressure reading during the pressure test exceeds the maximum pressure of this stage and does not decay within half an hour, it means that the oil injection pump has passed the inspection; if the pressure reading does not reach the maximum pressure of this stage or decays rapidly after reaching it, the oil injection pump needs to be re-inspected until it meets the requirements.

[0027] The utility model has the advantages of small size and simple operation, and can be used for high pressure level (40MPa). It can perform pressure detection on the oil injection pump after maintenance in the shutdown state, thus avoiding the complicated situation of opening the compressor to detect the oil injection pump in the past.

[0028] Parts of the present invention that are not described in detail belong to common knowledge among those skilled in the art.

Claims

1. A fuel injection pump pressure detection device, characterized in that: include: A nut (1), a welding joint (2), a ball head rod (3) and a rocker arm column (4); A through hollow cavity is axially arranged inside the rocker arm column (4), the inner wall of the lower part of the hollow cavity is provided with a thread, and the inner diameter of the threaded section of the hollow cavity is larger than the inner diameter of the upper non-threaded section; the ball head rod (3) is a hollow structure, the ball head rod (3) penetrates from the lower part of the rocker arm column (4), the ball head of the ball head rod (3) is stuck in the step formed by the threaded section and the non-threaded section, and the rod-shaped part of the ball head rod (3) passes through the non-threaded section of the hollow cavity of the rocker arm column (4) and then extends out; The welding joint (2) passes through the nut (1) and is welded to the upper end surface of the ball head rod (3) extending out of the non-threaded section of the hollow cavity of the rocker arm column (4); the threaded section of the hollow cavity of the rocker arm column (4) is used for threaded connection with the oil outlet of the oil injection pump; the pressure gauge is installed on the nut (1) and is located on the upper surface of the welding joint (2).

2. The oil injection pump pressure detection device according to claim 1, characterized in that: A sealing gasket is placed on the upper surface of the welding joint (2), and the pressure gauge is located on the sealing gasket on the upper surface of the welding joint (2).

3. The oil injection pump pressure detection device according to claim 2, characterized in that: The sealing gasket is a polytetrafluoroethylene gasket.

4. The oil injection pump pressure detection device according to claim 1, characterized in that: The rod-shaped part of the ball head rod is clearance-matched with the non-threaded section of the hollow cavity of the rocker arm column.

5. The oil injection pump pressure detection device according to claim 1, characterized in that: The weld joint and the nut have a clearance fit.

6. The oil injection pump pressure detection device according to claim 1, characterized in that: Two rocker arms are symmetrically arranged on the upper outer wall of the rocker arm column.

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