Cartridge valve with vacuum stopper

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a cartridge valve with a vacuum stopper. The cartridge valve with the vacuum stopping device comprises a valve sleeve, an electromagnetic valve, an ejector rod, a connecting spring, a connecting cover and a vacuum stopping valve, the valve sleeve is a core component of the whole device and is installed on a valve block of a hydraulic system, a liquid inlet is formed in the lower end of the interior of the valve sleeve, the liquid inlet is communicated with an inner channel of the valve block, and a liquid outlet is formed in the lower end of the valve sleeve. Through holes are symmetrically formed in the lower side in the valve sleeve left and right, the through holes and the liquid inlet are arranged in a T shape, the ejector rod is slidably connected into the valve sleeve, and in the initial state, the lower end of the ejector rod blocks the through holes in the two sides. When water flows back due to vacuum at the liquid inlet, the vacuum stop valve is automatically started to supply air, so that the discharged water is effectively prevented from flowing back to pollute a valve sleeve and a system, the equipment is prevented from being damaged due to pressure fluctuation or vacuum conditions, the service life of the equipment is prolonged, and the failure probability of the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic control technical field especially relates to a plug-in valve with vacuum stopper. BACKGROUND

[0002] In the actual operation process of the hydraulic system, the pressure in the system will be affected by various factors and fluctuate. Among them, the pressure change at the liquid inlet is particularly critical. When the system operating condition changes, such as sudden change of liquid flow rate, equipment start-stop and the like, the liquid inlet is prone to form a vacuum state.

[0003] Once the liquid inlet forms a vacuum, a series of serious problems will be caused. The discharged liquid backflows under the action of negative pressure, which not only pollutes the entire hydraulic system, causes the purity of oil or other working medium in the system to decrease, and affects the normal working performance of the system, but also carries impurities into key components such as valve sleeves, accelerates the wear of components, and reduces the service life of equipment. At the same time, frequent pressure fluctuations and vacuum state will cause additional impact and stress on each element in the system, increase the probability of equipment failure, cause the maintenance cost to rise, and even affect the continuity and stability of the entire production process.

[0004] Therefore, it is necessary to design a plug-in valve with a vacuum stopper to solve the above technical problems. SUMMARY

[0005] In order to overcome the above-mentioned shortcomings, the utility model aims at providing a plug-in valve with a vacuum stopper.

[0006] A plug-in valve with a vacuum stopper comprises a valve sleeve, a solenoid valve, a top rod, a connecting spring, a connecting cover and a vacuum stop valve. The valve sleeve is the core component of the entire device, which is installed on the valve block of the hydraulic system. A liquid inlet is formed at the lower end of the valve sleeve, which communicates with the internal passage of the valve block. Two through holes are symmetrically formed at the lower side of the valve sleeve, which are arranged in T shape with the liquid inlet. The top rod is connected to the inside of the valve sleeve in a sliding manner. In the initial state, the lower end of the top rod blocks the two through holes. The connecting spring is arranged between the top rod and the valve sleeve. The connecting cover is installed at the top of the valve sleeve. The upper end of the top rod is in sliding fit with the inside of the connecting cover, and the internal passages of the two are communicated. The solenoid valve is installed at the bottom of the connecting cover. The extension end of the solenoid valve is directly connected with the top rod. The vacuum stop valve is installed at the top of the connecting cover, and the internal passage of the vacuum stop valve is communicated with the internal passage of the connecting cover.

[0007] As a further preferred scheme, the top rod is in cylindrical structure, the surface roughness Ra of which is less than or equal to 0.8 μm, and the cylindrical error is within ±0.02 mm.

[0008] As a further preferred scheme, the valve sleeve is made of high-strength alloy steel material.

[0009] As a further preferred solution, the first external thread is further included, and the lower end of the valve sleeve is provided with the first external thread, which is threadedly connected with the valve block.

[0010] As a further preferred solution, the second external thread is further included, and the upper end of the connecting cover is provided with the second external thread, and the connecting cover is threadedly connected with the valve sleeve through the second external thread.

[0011] As a further preferred solution, the third external thread and the internal thread are further included, the lower end of the vacuum stop valve is provided with the third external thread, and the upper end of the connecting cover is provided with the internal thread, which is threadedly connected with the third external thread.

[0012] The utility model discloses the beneficial effect is: 1, when the liquid inlet appears vacuum and leads to water backflow, vacuum stop valve automatic starting air supplement, effectively prevent the water backflow pollution valve sleeve and system, avoid the equipment from pressure fluctuation or vacuum condition suffers damage, prolongs the service life of equipment, reduces equipment failure probability.

[0013] 2, the valve sleeve is threadedly connected with the valve block and the vacuum stop valve and the connecting cover, can be quickly assembled when installing, also does not need complicated tool when disassembling, and can be operated by hand or simple tool, greatly improves the efficiency of equipment installation and subsequent maintenance, overhaul. DRAWINGS

[0014] Fig. 1 It is the plane structure schematic view of the utility model.

[0015] Fig. 2 It is the plane structure schematic view of the utility model liquid inlet, through -hole and first external thread etc.

[0016] Fig. 3 It is the plane structure schematic view of the utility model ejector rod, connecting spring and solenoid valve etc. In the figure, the component name and serial number are as follows: 1_valve sleeve, 101_liquid inlet, 102_solenoid valve, 2_through -hole, 3_first external thread, 4_ejector rod, 5_connecting spring, 6_connecting cover, 7_second external thread, 8_vacuum stop valve, 9_third external thread, 10_internal thread. CONCRETE IMPLEMENTING METHOD

[0017] The utility model will be described in detail below in connection with the drawings and specific embodiment, but not as the limitation of the utility model.

[0018] Embodiment: a kind of with vacuum stopper's plug-in valve, as shown in Figs. 1-3As shown, including valve sleeve 1, solenoid valve 102, ejector rod 4, connecting spring 5, connecting cover 6 and vacuum stop valve 8, valve sleeve 1 is the core component of the whole device, which is installed on the valve block of the hydraulic system, the lower end of the valve sleeve 1 is provided with a liquid inlet 101, which is communicated with the internal passage of the valve block for introducing fluid, the valve sleeve 1 is made of high-strength alloy steel material, which has good wear resistance and corrosion resistance, can effectively resist the erosion and corrosion of the liquid in the hydraulic system, prolong the service life of the valve sleeve 1, the lower side of the valve sleeve 1 is provided with a through hole 2, which is used as the main flow path of the fluid, and is arranged in T shape with the liquid inlet 101, the ejector rod 4 is slidably connected in the valve sleeve 1, in the initial state, the lower end thereof blocks the two side through holes 2 to prevent the flow of liquid, the connecting spring 5 is arranged between the ejector rod 4 and the valve sleeve 1, and the connecting spring 5 and the valve sleeve 1 are connected by hooks, which is convenient for subsequent disassembly and maintenance, the connecting cover 6 is installed on the top of the valve sleeve 1, the upper end of the ejector rod 4 is slidably connected with the connecting cover 6, and the internal passages of the two are communicated, the ejector rod 4 is in cylindrical structure, the surface roughness Ra thereof is less than or equal to 0.8 μm, and the cylindrical error is within ±0.02 mm, so as to ensure the sliding fit precision between the ejector rod 4 and the valve sleeve 1 and the connecting cover 6, reduce the movement resistance and leakage, the solenoid valve 102 is installed on the bottom of the connecting cover 6, the telescopic end of the solenoid valve 102 is directly connected with the ejector rod 4, and the movement of the ejector rod 4 can be controlled through the action of the solenoid valve 102, the vacuum stop valve 8 is installed on the top of the connecting cover 6, and the vacuum stop valve 8 is communicated with the internal passage of the connecting cover 6.

[0019] When the pressure in the hydraulic system is in a normal state, the solenoid valve 102 is powered on, the ejector rod 4 is controlled to move upward, the liquid inlet 101 is communicated with the two side through holes 2, at this time, the connecting spring 5 is stretched under the action of the upward force of the ejector rod 4, and the fluid can smoothly enter the two side through holes 2 through the liquid inlet 101, when the solenoid valve 102 is powered off and closed, the solenoid valve 102 drives the ejector rod 4 to move downward and reset, the ejector rod 4 re-closes the two side through holes 2, cuts off the liquid passage, at the same time, the connecting spring 5 rebounds and resets, providing stable support force for the ejector rod 4, ensuring the reliability of the closed state, when the liquid inlet 101 is in a vacuum state due to the change of system working condition, causing the backflow of discharged water, which may pollute the valve sleeve 1 and the whole system, the vacuum stop valve 8 will automatically start. The vacuum stop valve 8 supplements air to the liquid inlet 101 through the passage of the ejector rod 4 and the connecting cover 6, balances the pressure of the liquid inlet 101, so that the system can normally drain water, avoids the backflow phenomenon, thereby effectively protecting the equipment from damage caused by pressure fluctuation or vacuum condition, improving the stability and service life of the equipment.

[0020] As Figs. 1-3As shown, it also includes the first external thread 3, the second external thread 7, the third external thread 9 and the internal thread 10, the lower end of the valve sleeve 1 is provided with the first external thread 3, which is matched with the valve block, and the stable installation of the valve sleeve 1 and the valve block is realized through the threaded connection, the upper end of the connecting cover 6 is provided with the second external thread 7, the connecting cover 6 is connected with the valve sleeve 1 through the second external thread 7, so that the connecting cover 6 is convenient to disassemble and maintain, the lower end of the vacuum stop valve 8 is provided with the third external thread 9, the upper end of the connecting cover 6 is provided with the internal thread 10, the internal thread 10 is matched with the third external thread 9, not only the installation of the vacuum stop valve 8 is realized, but also when the vacuum stop valve 8 needs to be disassembled, it can be easily completed through the rotation.

[0021] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be the protection scope of the claims.

Claims

1. A cartridge valve with a vacuum stopper, characterized in that: The device includes a valve sleeve (1), a solenoid valve (102), a push rod (4), a connecting spring (5), a connecting cover (6), and a vacuum stop valve (8). The valve sleeve (1) is the core component of the entire device, which is installed on the valve block of the hydraulic system. The lower end of the valve sleeve (1) has an inlet (101) that communicates with the internal channel of the valve block. The lower side of the valve sleeve (1) has symmetrical through holes (2) arranged in a T-shape with the inlet (101). The push rod (4) is slidably connected to the inside of the valve sleeve (1). In the initial state, its lower end blocks the through holes (2) on both sides. The connecting spring (5) is set between the top rod (4) and the valve sleeve (1). The valve sleeve (1) is equipped with a connecting cover (6) on the top. The upper end of the top rod (4) slides in the connecting cover (6) and the internal channels of the two are connected. The bottom of the connecting cover (6) is equipped with a solenoid valve (102). The telescopic end of the solenoid valve (102) is directly connected to the top rod (4). The top of the connecting cover (6) is equipped with a vacuum stop valve (8). The vacuum stop valve (8) is connected to the internal channel of the connecting cover (6).

2. A cartridge valve with a vacuum stopper as described in claim 1, characterized in that: The push rod (4) is a cylindrical structure with a surface roughness Ra of less than or equal to 0.8 μm and a cylindricity error within ±0.02 mm.

3. A cartridge valve with a vacuum stopper as described in claim 2, characterized in that: The valve sleeve (1) is made of high-strength alloy steel.

4. A cartridge valve with a vacuum stopper as described in claim 3, characterized in that: It also includes a first external thread (3), and the lower end of the valve sleeve (1) is provided with a first external thread (3), which is threaded with the valve block.

5. A cartridge valve with a vacuum stopper as described in claim 4, characterized in that: It also includes a second external thread (7). The upper outer side of the connecting cover (6) is provided with a second external thread (7), and the connecting cover (6) is threadedly connected to the valve sleeve (1) through the second external thread (7).

6. A cartridge valve with a vacuum stopper as described in claim 5, characterized in that: It also includes a third external thread (9) and an internal thread (10). The lower outer side of the vacuum stop valve (8) is provided with a third external thread (9), and the inner wall of the upper end of the connecting cover (6) is provided with an internal thread (10). The internal thread (10) and the third external thread (9) cooperate with each other.

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