Large flow air respirator for hydraulic oil tank of construction machinery

Abstract

The present invention relates to a large-flow air respirator for a hydraulic oil tank of an engineering machinery, comprising a housing, a housing upper cover, a connecting rod, an air main filter element, a water-gas separation filter element, an air inlet check valve and an air outlet check valve, the upper end of the housing has an opening, the lower end is provided with a gas inlet and outlet, the upper end of the housing has a plurality of air inlet holes, the lower part of the housing is divided into an upper chamber and a lower chamber by a partition plate, the partition plate has a connecting hole, the lower end of the connecting rod is fixed on the partition plate, the air main filter element and the water-gas separation filter element are both installed in the upper chamber, the water-gas separation filter element is located in the air main filter element, the air inlet check valve is installed on the connecting hole of the partition plate, the housing of the lower chamber is connected with an air outlet pipe, and the air outlet check valve is installed on the air outlet pipe. The air flow of the respirator is large, the filtration efficiency is high, and it can also absorb moisture. In addition, the air inlet and outlet are divided into two different paths, which can not only prolong the service life of the filter element, but also reduce the air outlet resistance.

Description

Technical Field

[0001] The invention relates to an air respirator for an oil tank, in particular to a large-flow air respirator for a hydraulic oil tank of an engineering machinery. Background Art

[0002] The hydraulic oil tank air respirator is a channel for the exchange of gas inside the hydraulic oil tank with the outside gas. Its main function is to ensure the smooth exchange of air inside and outside the hydraulic oil tank, and at the same time filter the air entering the hydraulic oil tank so that the oil is not contaminated when the air pressure inside the hydraulic oil tank is balanced with the outside air pressure; if the respirator flow is small or blocked, it will cause a pressure difference between the hydraulic oil tank and the outside gas. When the construction machinery is working, the oil in the hydraulic oil tank enters the hydraulic system to participate in the work, and the liquid level will drop rapidly, forming a negative pressure with the outside gas. If the respirator is blocked or the air flow cannot meet the requirements, the oil tank will be in a negative pressure state; when the construction machinery completes the work and returns the oil, the liquid level will rise rapidly again, forming a positive pressure with the outside gas. If the respirator is also blocked or the flow is insufficient, the oil tank will be in a positive pressure state again; if the oil tank forms a state of alternating positive and negative pressure for a long time, it will cause the system to shut down or fail to work. In severe cases, it will cause internal stress to form in the entire oil tank, resulting in cracks and oil leakage.

[0003] In addition, the air filtration effect of the oil tank air respirator, as well as the actual use and replacement and installation effects, have different impacts on the hydraulic oil tank and even the entire engineering machinery hydraulic system. Figure 6 (as shown) In terms of technical performance, the main deficiencies are: 1. Small air flow; it is easy to cause insufficient oil supply to the oil tank or failure to return oil; 2. Poor air filtration effect; most existing respirators use non-woven fabrics as filter materials, and the filtration efficiency is low; 3. Since the filter element is generally riveted and encapsulated in the shell and cannot be disassembled, the filter element cannot be removed separately and cannot be replaced, resulting in high cost of use and difficult maintenance; 4. The inlet and outlet air are in the same path, so that the hydraulic oil and gas also pass through the filter element when they are discharged, which increases the outlet resistance, and the air mixed with oil and gas in the oil tank will adhere to the filter element after passing through the filter element, causing the filter element to be blocked prematurely, reducing the service life of the filter element; 5. The filter material used has no filtering effect on air containing moisture and cannot filter water vapor in the air. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a large-flow air respirator for a hydraulic oil tank of engineering machinery. The respirator has a large filtering area, a large air flow, and a high filtering efficiency. It can also filter the moisture in the air entering the oil tank. In addition, the inlet and outlet air are divided into two different paths, which can not only extend the service life of the filter element, but also reduce the air outlet resistance and have a high air outlet efficiency.

[0005] The technical solution to solve the above technical problems is: a large-flow air respirator for a hydraulic oil tank of engineering machinery, comprising a shell, a shell cover, a connecting rod, an air main filter element, a water-gas separation filter element, an air inlet check valve and an air outlet check valve. The upper end of the shell has an opening, and the lower end is provided with a gas inlet and outlet. The shell cover is detachably mounted on the upper end opening of the shell. The upper end of the shell is provided with a plurality of air inlet holes. The lower part of the shell is divided by a partition plate to form an upper chamber and a lower chamber. The partition plate is provided with a connecting hole. The connecting rod is located in the middle of the shell. The lower end of the connecting rod is fixed on the partition plate. The air main filter element and the water-gas separation filter element are both installed in the upper chamber and fixed by the connecting rod. The water-gas separation filter element is located in the air main filter element. The air inlet check valve is installed on the connecting hole of the partition plate and fixed on the connecting rod. The shell of the lower chamber is connected with an air outlet pipe, and the air outlet check valve is installed on the air outlet pipe.

[0006] A vacuum alarm is also installed on the air outlet pipe.

[0007] The air inlet check valve and the air outlet check valve are both composed of a valve seat, a rubber valve core and a positioning nut. The valve seat is a flat plate with an air vent opened on it. The rubber valve core is trumpet-shaped with one end large and the other end small. The small end of the rubber valve core is fixedly connected to the positioning nut. The mounting structure of the air inlet check valve is as follows: the valve seat is fixed in the connecting hole of the partition plate and passes through the connecting rod. The rubber valve core is installed on the connecting rod through the positioning nut. The large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent. The mounting structure of the air outlet check valve is as follows: the valve seat is fixed in the air outlet pipe. A mounting rod is fixed on the valve seat. The rubber valve core is installed on the mounting rod through the positioning nut. The large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent.

[0008] The housing upper cover passes through the upper end of the connecting rod and is fixed by a locking nut.

[0009] The shell upper cover has a side baffle extending downwards, the side baffle is located outside the air inlet hole, and an air inlet channel is formed between the side baffle and the shell.

[0010] The outer wall of the shell is also provided with a fixing frame for installing the respirator.

[0011] The filter material of the main air filter element is high temperature resistant composite glass fiber.

[0012] The filter material of the water-gas separation filter element is a desiccant.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In order to meet the requirements of large air flow of engineering machinery, the main air filter of the present invention not only increases the filter area of ​​the filter in structure, but also adopts composite glass fiber with large flow, small resistance and high temperature resistance as the filter material, which can greatly improve the air flow and filtering efficiency.

[0015] 2. Add a water vapor separation filter to prevent a large amount of water vapor from entering the hydraulic oil tank and contaminating the oil during operation.

[0016] 3. Add inlet and outlet one-way valves to separate the inlet and outlet air and let each go its own way. Since there is oil in the air when it is discharged, it will not pass through the filter element after being divided, which can increase the service life of the filter element. At the same time, it can reduce the outlet resistance and improve the outlet efficiency.

[0017] 4. Add a detachable filter element structure to the housing to facilitate replacement of the filter element.

[0018] 5. Add a vacuum alarm structure to facilitate timely maintenance of the equipment in the future.

[0019] 6. The air respirator structure of the present invention is installed on the main oil tank, which can replace the original auxiliary oil tank of the engineering machinery, simplify the oil tank structure, and reduce the manufacturing cost of the engineering machinery.

[0020] The technical features of the large-flow air respirator for the hydraulic oil tank of engineering machinery of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : Schematic diagram of the structure of a large-flow air respirator for a hydraulic oil tank of an engineering machinery of the present invention.

[0022] Figure 2 : Front view of the large flow air respirator for the hydraulic oil tank of engineering machinery of the present invention.

[0023] Figure 3 : The usage status diagram of the large-flow air respirator for the hydraulic oil tank of the engineering machinery of the present invention.

[0024] Figure 4 : Schematic diagram of the intake check valve of the present invention in the open state (when subjected to positive intake pressure).

[0025] Figure 5 : Schematic diagram of the closed state of the air intake check valve of the present invention (when subjected to reverse outlet pressure).

[0026] Figure 6 : Schematic diagram of the existing air respirator structure.

[0027] In the figure: 1-locking nut, 2-shell cover, 21-side baffle, 3-shell, 31-air inlet, 32-air outlet pipe, 33-gas inlet and outlet, 4-main air filter, 5-water-gas separation filter, 6-partition plate, 7-inlet check valve, 8-outlet check valve, 9-vacuum alarm, 10-fixed bracket, 11-connecting rod, 12-valve seat, 13-rubber valve core, 14-positioning nut, 15-mounting rod.

[0028] A1-upper chamber, A2-lower chamber.

[0029] P1-air respirator of the present invention, P2-connecting pipe, P3-spring clamp, P4-hydraulic oil tank.

[0030] B1-housing, B2-filter element, B3-intake pipe.

[0031] The arrows in the figure indicate the direction of gas flow. DETAILED DESCRIPTION

[0032] Embodiment 1: A large-flow air respirator for a hydraulic oil tank of an engineering machinery, such as Figure 1-Figure 3 As shown, it includes a shell 3, a shell cover 2, a connecting rod 11, an air main filter element 4, a water-gas separation filter element 5, an air inlet check valve 7 and an air outlet check valve 8. The upper end of the shell has an opening, and the lower end is provided with a gas inlet and outlet 33. The shell cover is detachably mounted on the upper end opening of the shell. The upper end of the shell is provided with a plurality of air inlet holes 31. The lower part of the shell is divided by a partition plate 6 to form an upper chamber A1 and a lower chamber A2. The partition plate is provided with a connecting hole connecting the upper chamber and the lower chamber. The connecting rod is located in the middle of the shell, and the lower end of the connecting rod is fixed on the partition plate. The air main filter element and the water-gas separation filter element are both installed in the upper chamber and fixed by the connecting rod. The water-gas separation filter element is located in the air main filter element. The air inlet check valve is installed on the connecting hole of the partition plate and fixed on the connecting rod. The air inlet check valve 7 is located in the lower chamber; an air outlet pipe 32 is connected to the shell of the lower chamber, and the air outlet check valve 8 is installed on the air outlet pipe. The outer wall of the shell is also provided with a fixing frame 10 for mounting the respirator.

[0033] In this embodiment, a vacuum alarm 9 is also installed on the air outlet pipe. When the filter element blocks the housing and cannot inhale, the vacuum alarm starts to alarm, reminding to replace the filter element, which is convenient for timely maintenance. As a change, the vacuum alarm can also be omitted. After the omission, the respirator can still work normally, but whether the filter element is replaced during long-term use cannot be directly reflected, which is not conducive to the user's maintenance work and equipment troubleshooting.

[0034] In this embodiment, the air inlet check valve and the air outlet check valve are both composed of a valve seat 12, a rubber valve core 13 and a positioning nut 14. The valve seat is a flat plate with an air vent 121 opened thereon, and the rubber valve core is trumpet-shaped with one end large and the other end small. The small end of the rubber valve core is fixedly connected to the positioning nut. The mounting structure of the air inlet check valve is as follows: the valve seat and the partition plate 6 are integrally formed, the valve seat is fixed in the connecting hole of the partition plate and passes through the connecting rod 11, the rubber valve core is mounted on the connecting rod through the positioning nut, and the large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent; the mounting structure of the air outlet check valve is as follows: the valve seat is fixed in the air outlet pipe, a mounting rod 15 is fixed on the valve seat, and the rubber valve core is mounted on the mounting rod through the positioning nut, and the large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent. When there is no external force, the inlet check valve and the outlet check valve are in a normally closed state. When the rubber valve core is subjected to the positive pressure of the gas flowing from the large end to the small end of the rubber valve core, the rubber valve core is blown open by the gas. Figure 4 As shown in the figure; when the rubber valve core is subjected to the reverse pressure of the gas flowing from the small end to the large end of the rubber valve core, the rubber valve core is blown toward the valve seat by the gas and remains in the closed state, as shown in the figure. Figure 5 As a variation, the inlet check valve and the outlet check valve may also adopt other structures that meet the use requirements.

[0035] In this embodiment, the housing upper cover 2 passes through the upper end of the connecting rod and is fixed by the locking nut 1. As a variation, other methods that are easy to disassemble and assemble can also be used to install the housing upper cover.

[0036] In this embodiment, the upper cover of the housing has a side baffle 21 extending downward, the side baffle is located outside the air inlet, and an air inlet channel is formed between the side baffle and the housing. The side baffle is used to prevent rainwater or other debris from directly impacting the product and prevent rainwater or other debris from entering the housing through the air inlet.

[0037] In this embodiment, the filter material of the main air filter element uses high-efficiency, low-resistance, high-temperature resistant composite glass fiber and a clamped electrophoresis wire mesh structure. The filter element air outlet is injection molded with PU glue, which can replace metal materials and rubber sealing rings to increase sealing reliability.

[0038] In this embodiment, the filter material of the water-gas separation filter element is a desiccant, which has strong air permeability and good water absorption and can be reused.

[0039] The inlet check valve and outlet check valve described in this embodiment are mainly composed of a porous valve seat and a retractable rubber valve core, which are connected and assembled by a screw and a nut. Due to the installation of the inlet check valve and the outlet check valve, the inlet and outlet gases can be diverted and divided, the inlet and outlet gas efficiency is improved, the outlet resistance is reduced, and the service life of the filter element is increased.

[0040] The hydraulic oil tank air respirator of the present invention is installed on the top of the hydraulic oil tank of the engineering machinery, and is installed on the frame of the engineering equipment using a fixing bracket. When the engineering machinery equipment is working, if the hydraulic oil level in the hydraulic oil tank drops, clean and dry air can be quickly added to the oil tank, and if the oil level in the oil tank rises, it can be quickly exhausted to the outside. Since the air inlet and the air outlet are both provided with a one-way valve structure, the inlet and outlet are different, that is, the gas passes through the filter element when inlet, and does not need to pass through the filter element when exhausting, so that the gas can be discharged quickly.

[0041] The air respirator of the present invention can be maintained and replaced when its filter element reaches the end of its service life. During maintenance, it is only necessary to open the upper cover of the shell and remove the locking nut to replace the filter element. In addition, a vacuum alarm is provided at the air outlet. When the filter element is blocked, the shell will not be able to inhale air, and the vacuum alarm starts to alarm, reminding to replace the filter element.

[0042] Comparative experiment

[0043] A comparative experiment was conducted using the air respirator of the present invention and the existing air respirator of the background art. The two had the same diameter and were tested under the same conditions. The experimental results obtained were as follows.

[0044] Table 1 is a table showing the comparison of intake flow rates under the same resistance conditions.

[0045]

[0046] It can be seen from the data in Table 1 that, when exhausting, under the condition of equal resistance, the flow rate of the present invention is increased compared with the intake air volume.

[0047] Table 2 is a table showing the laboratory filtration efficiency and laboratory life data of the present invention.

[0048]

[0049] It can be seen from the data in Table 2 that the air filtration efficiency and laboratory life of the present invention are significantly better than those of the air respirator with existing structure.

Claims

1. A large-flow air respirator for a hydraulic oil tank of an engineering machinery, characterized in that: The invention comprises a housing (3), a housing upper cover (2), a connecting rod (11), a main air filter element (4), a water-gas separation filter element (5), an air inlet check valve (7) and an air outlet check valve (8), wherein the upper end of the housing has an opening, and the lower end is provided with a gas inlet and outlet (33), the housing upper cover is detachably mounted on the upper end opening of the housing, the upper end of the housing is provided with a plurality of air inlet holes (31), the lower portion of the housing is divided into an upper chamber and a lower chamber by a partition plate (6), the partition plate is provided with a connecting hole, the connecting rod is located in the middle of the housing, the lower end of the connecting rod is fixed to the partition plate, the main air filter element and the water-gas separation filter element are both mounted in the upper chamber and fixed by the connecting rod, the water-gas separation filter element is located in the main air filter element, the air inlet check valve is mounted on the connecting hole of the partition plate and fixed on the connecting rod, the housing of the lower chamber is connected with an air outlet pipe (32), and the air outlet check valve (8) is mounted on the air outlet pipe.

2. The large-flow air respirator for hydraulic oil tank of engineering machinery according to claim 1 is characterized in that: A vacuum alarm (9) is also installed on the air outlet pipe.

3. The large-flow air respirator for hydraulic oil tank of engineering machinery according to claim 1 or 2, characterized in that: The inlet check valve and the outlet check valve are both composed of a valve seat (12), a rubber valve core (13) and a positioning nut (14). The valve seat is a flat plate with an air vent (121) formed thereon. The rubber valve core is trumpet-shaped with one end larger than the other end. The small end of the rubber valve core is fixedly connected to the positioning nut. The installation structure of the inlet check valve is as follows: the valve seat is fixed in the connecting hole of the partition plate and passes through the connecting rod. The rubber valve core is installed on the connecting rod through the positioning nut. The large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent. The installation structure of the outlet check valve is as follows: the valve seat is fixed in the air outlet pipe. A mounting rod (15) is fixed on the valve seat. The rubber valve core is installed on the mounting rod through the positioning nut. The large end of the rubber valve core is in sealing contact with the valve seat and blocks the air vent.

4. The large-flow air respirator for a hydraulic oil tank of an engineering machinery according to claim 1 or 2, characterized in that: The housing upper cover (2) passes through the upper end of the connecting rod and is fixed by a locking nut (1).

5. The large-flow air respirator for hydraulic oil tank of engineering machinery according to claim 1 or 2, characterized in that: The housing upper cover has a side baffle (21) extending downwards, the side baffle is located outside the air inlet hole, and an air inlet channel is formed between the side baffle and the housing.

6. The large-flow air respirator for hydraulic oil tank of engineering machinery according to claim 1 or 2, characterized in that: The outer wall of the shell is also provided with a fixing frame (10) for mounting the respirator.

7. The large-flow air respirator for a hydraulic oil tank of an engineering machinery according to claim 1 or 2, characterized in that: The filter material of the main air filter element is high temperature resistant composite glass fiber.

8. The large-flow air respirator for a hydraulic oil tank of an engineering machinery according to claim 1 or 2, characterized in that: The filter material of the water-gas separation filter element is a desiccant.

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