CN212177962U

CN212177962U - Guide check valve

Info

Publication number: CN212177962U
Application number: CN202020583735.2U
Authority: CN
Inventors: 李成; 唐佳嘉
Original assignee: Guangzhou Hongjia Electromechanical Science And Technology Co ltd
Current assignee: Guangzhou Hongjia Electromechanical Science And Technology Co ltd
Priority date: 2020-04-18
Filing date: 2020-04-18
Publication date: 2020-12-18
Anticipated expiration: 2030-04-18

Abstract

The utility model relates to a guide check valve, its technical scheme main points are: a hollow channel is arranged in the check valve body, and the hollow channel is provided with a first opening used for connecting a rodless cavity of the oil cylinder and a second opening used for connecting a rod cavity of the oil cylinder; a third opening for connecting an oil pipeline is formed in the side wall of the check valve body, and the third opening is communicated with the hollow channel; a sealing part and a limiting part are arranged in the hollow channel; a valve core is slidably arranged in the hollow channel; when the valve core is in a first state, the valve core is limited on the limiting part, and the valve core is in non-sealing connection with the sealing part; when the valve core is in the second state, the valve core is limited on the sealing part, and the valve core and the limiting part are in non-limiting connection. The effect is as follows: the structure is simple, and the cost is low. Secondly, for the existing check valve, the volume is obviously reduced. Thirdly, the condition that the oil pressure deviation in the oil cylinder causes the inaccurate stroke of the oil cylinder can be effectively prevented.

Description

Guide check valve

Technical Field

The utility model relates to a valve of hydro-cylinder, more specifically say, it relates to a guide check valve.

Background

The check valve is a valve for backflow of fluid medium, and is commonly used on precision instruments such as an oil cylinder and the like. The check valve belongs to an automatic valve, and can play a role in preventing oil backflow of a rodless cavity of an oil cylinder when being applied to the oil cylinder. However, the conventional check valve has a complicated structure, a large volume and high cost, which results in that many small-sized enterprises give up practical check valves.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, the utility model aims to provide a guide check valve has simple structure's advantage.

The above technical purpose of the present invention can be achieved by the following technical solutions: a pilot check valve includes a check valve body; a hollow channel is formed in the check valve body, and the hollow channel is provided with a first opening used for connecting a rodless cavity of the oil cylinder and a second opening used for connecting a rod cavity of the oil cylinder; a third opening for connecting an oil pipeline is formed in the side wall of the check valve body, and the third opening is communicated with the hollow channel; a sealing part and a limiting part are arranged in the hollow channel, the sealing part is positioned between the first opening and the third opening, and the limiting part is positioned between the second opening and the third opening; a valve core is slidably arranged in the hollow channel, and the valve core has a first state that the first opening is communicated with the third opening and a second state that the first opening is separated from the third opening; when the valve core is in a first state, the valve core is limited on the limiting part, and the valve core is in non-sealing connection with the sealing part; when the valve core is in the second state, the valve core is limited on the sealing part, and the valve core is in non-limiting connection with the limiting part.

Optionally, the hollow channel is composed of a first section of channel, a second section of channel and a third section of channel along the direction from the first opening to the second opening; the diameter of the first section of channel is larger than that of the second section of channel, and the sealing part is a connecting section of the first section of channel and the second section of channel; the diameter of the third section of channel is larger than that of the second section of channel, and the limiting part is a connecting section of the third section of channel and the second section of channel.

Optionally, the valve core is composed of a first section of valve rod, a second section of valve rod and a third section of valve rod which face the second opening along the first opening; the first section of valve rod is positioned in the first section of channel, and the diameter of the first section of valve rod is larger than that of the second section of channel; the third section of valve rod is positioned in the third section of channel, and the diameter of the third section of valve rod is larger than that of the second section of channel.

Optionally, the diameter of the first valve stem is smaller than the diameter of the first passage.

Optionally, the third-section valve rod and the third-section channel are arranged in a sealing manner through a sealing ring.

Optionally, a clamping member is arranged at the first opening, and a spring is arranged between the clamping member and the valve core.

To sum up, the utility model discloses following beneficial effect has:

the structure is simple, and the cost is low.

Secondly, for the existing check valve, the volume is obviously reduced.

Thirdly, the condition that the oil pressure deviation in the oil cylinder causes the inaccurate stroke of the oil cylinder can be effectively prevented.

Drawings

FIG. 1 is a schematic view of the structure of a pilot check valve;

fig. 2 is a schematic structural view of the check valve body according to the present embodiment.

In the figure: 1. a check valve body; 101. a hollow channel; 1011. a first opening; 1012. a second opening; 1013. a sealing part; 1014. a limiting part; 1015. a first section of channel; 1016. a second section of channel; 1017. a third section of channel; 102. a third opening; 2. a valve core; 201. a first segment valve stem; 202. a second section of valve stem; 203. a third segment valve stem; 3. a clamping piece; 4. a spring.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

The present application provides a pilot check valve, as shown in fig. 1, comprising a check valve body 1. A hollow passage 101 is formed in the check valve body 1, and the hollow passage 101 is cylindrical. The hollow passageway 101 has a first opening 1011 for connecting to the rodless chamber of the cylinder and a second opening 1012 for connecting to the rodless chamber of the cylinder. A third opening 102 for connecting an oil pipeline is formed in the side wall of the check valve body 1, the third opening 102 is communicated with the hollow channel 101, and the hollow channel 101 has three openings communicated with the outside. A seal part 1013 and a stopper part 1014 are provided in the hollow passage 101, the seal part 1013 is between the first opening 1011 and the third opening 102, and the stopper part 1014 is between the second opening 1012 and the third opening 102. The valve body 2 is slidably provided in the hollow passage 101, and the valve body 2 has a first state in which the first opening 1011 and the third opening 102 communicate with each other and a second state in which the first opening 1011 and the third opening 102 are blocked (here, the first state and the second state refer to two positions at which the valve body 2 slides in the hollow passage 101). When the valve element 2 is in the first state, the valve element 2 is limited on the limit part 1014, the valve element 2 and the sealing part 1013 are in non-sealing connection, and when the valve element 2 and the sealing part 1013 are in non-sealing connection, the first opening 1011 is communicated with the third opening 102. When the valve element 2 is in the second state, the valve element 2 is stopped by the seal part 1013, and the valve element 2 is in non-stop connection with the stopper part 1014.

This application guide check valve is used for the hydro-cylinder, can prevent effectively that the oil pressure deviation in the hydro-cylinder from causing the condition that the hydro-cylinder stroke is inaccurate. When oil needs to be fed into the rodless cavity of the oil cylinder (the rod cavity of the oil cylinder is in an oil discharge state), oil enters the hollow channel 101 from the third opening 102, the valve core 2 is in the first state at the moment, the oil enters from the third opening 102, because the oil inlet pressure of the third opening 102 is larger at this time, the valve core 2 is pushed leftwards, so that the third opening 102 is communicated with the first opening 1011, oil flows into the rodless cavity of the oil cylinder from the third opening 102 through the first opening 1011, when the stroke of the rodless cavity of the oil cylinder is completed, the oil return pressure of the rodless cavity is larger than the oil inlet pressure of the third opening 102, the valve core 2 is pushed to move rightwards, so that the valve core 2 enters the second state, the valve core 2 is limited on the sealing part 1013, the valve core 2 is enabled to play a communication and separation role between the third opening 102 and the first opening 1011, oil in the rodless cavity of the oil cylinder is prevented from flowing back to the third opening 102 from the hollow channel 101, and the function of non-return (preventing oil in the rodless cavity of the oil cylinder from flowing back) is achieved. When oil enters the rod cavity of the oil cylinder (the rodless cavity of the oil cylinder is in an oil discharge state), the oil pressure of the oil entering from the second opening 1012 needs to be larger than the oil pressure of the oil returning from the first opening 1011 at this time, the valve core 2 is pushed leftwards by the oil entering pressure of the second opening 1012, so that the valve core 2 is in the first state, at this time, the third opening 102 is communicated with the first opening 1011, and the oil in the rodless cavity of the oil cylinder flows back to the third opening 102 along the hollow channel 101 and flows out.

Optionally, the hollow channel 101 is comprised of a first section channel 1015, a second section channel 1016, and a third section channel 1017 in the direction of the first opening 1011 towards the second opening 1012. The diameter of the first channel 1015 is greater than the diameter of the second channel 1016, and the sealing part 1013 is a connecting section of the first channel 1015 and the second channel 1016, and in some embodiments, the connecting end of the first channel 1015 and the second channel 1016 is inclined by 45 degrees. The valve core 2 is provided with an inclined section corresponding to the connection section, and when the inclined section and the sealing part 1013 limit each other, the function of blocking the third opening 102 and the first opening 1011 is realized. The diameter of the third section of channel 1017 is greater than the diameter of the second section of channel 1016, and the limiting portion 1014 is a connecting section between the third section of channel 1017 and the second section of channel 1016.

Further, the valve core 2 is composed of a first-stage valve rod 201, a second-stage valve rod 202 and a third-stage valve rod 203 along the direction of the first opening 1011 towards the second opening 1012. The first section of the valve rod 201 is positioned in the first section of the channel 1015, the diameter of the first section of the valve rod 201 is larger than that of the second section of the channel 1016, so that the first section of the valve rod 201 always slides in the first section of the channel 1015, and the inclined section of the valve core 2 in the upper section is the connection position of the first section of the valve rod 201 and the second section of the valve rod 202. The third section of the valve rod 203 is positioned in the third section of the channel 1017, the diameter of the third section of the valve rod 203 is larger than that of the second section of the channel 1016, so that the third section of the valve rod 203 always slides in the third section of the channel 1017, and because the diameter of the third section of the valve rod 203 is larger than that of the second section of the channel 1016, the third section of the valve rod 203 is limited by the limiting part 1014 and cannot enter the second section of the channel 1016. In some embodiments, the third segment of the valve stem 203 and the third segment of the passage 1017 are sealed by a sealing ring, so that the third opening 102 and the second opening 1012 are always isolated.

Optionally, a clamping member 3 is disposed at the first opening 1011, and a spring 4 is disposed between the clamping member 3 and the valve element 2, wherein the spring 4 is always kept in a compressed state in the check valve body 1, so that when the check valve body is not subjected to oil pressure, the valve element 2 and the sealing portion 1013 are always in a sealed state, and oil is prevented from wandering back and forth between the third opening 1013 and the first opening 1011 in a non-oil discharge and oil intake state.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A pilot check valve, characterized by: comprises a check valve body; a hollow channel is formed in the check valve body, and the hollow channel is provided with a first opening used for connecting a rodless cavity of the oil cylinder and a second opening used for connecting a rod cavity of the oil cylinder; a third opening for connecting an oil pipeline is formed in the side wall of the check valve body, and the third opening is communicated with the hollow channel; a sealing part and a limiting part are arranged in the hollow channel, the sealing part is positioned between the first opening and the third opening, and the limiting part is positioned between the second opening and the third opening; a valve core is slidably arranged in the hollow channel, and the valve core has a first state that the first opening is communicated with the third opening and a second state that the first opening is separated from the third opening; when the valve core is in a first state, the valve core is limited on the limiting part, and the valve core is in non-sealing connection with the sealing part; when the valve core is in the second state, the valve core is limited on the sealing part, and the valve core is in non-limiting connection with the limiting part.

2. The pilot check valve of claim 1, wherein: the hollow channel consists of a first section of channel, a second section of channel and a third section of channel along the direction from the first opening to the second opening; the diameter of the first section of channel is larger than that of the second section of channel, and the sealing part is a connecting section of the first section of channel and the second section of channel; the diameter of the third section of channel is larger than that of the second section of channel, and the limiting part is a connecting section of the third section of channel and the second section of channel.

3. The pilot check valve of claim 2, wherein: the valve core consists of a first section of valve rod, a second section of valve rod and a third section of valve rod which face the second opening along the first opening; the first section of valve rod is positioned in the first section of channel, and the diameter of the first section of valve rod is larger than that of the second section of channel; the third section of valve rod is positioned in the third section of channel, and the diameter of the third section of valve rod is larger than that of the second section of channel.

4. The pilot check valve of claim 3, wherein: the diameter of the first section of valve rod is smaller than that of the first section of channel.

5. The pilot check valve of claim 3, wherein: and the third section of valve rod and the third section of channel are arranged in a sealing way through a sealing ring.

6. The pilot check valve of claim 1, wherein: a clamping piece is arranged at the first opening, and a spring is arranged between the clamping piece and the valve core.