CN204372259U - Limiting mechanism of pressure - Google Patents

Abstract

The utility model provides a pressure limiting mechanism related to the technical field of regulating valves, which is arranged on the pressure input port in front of the valve. The pressure limiting mechanism includes: a cylinder liner, which is set on the valve; The cover is provided with a pressure input channel in front of the cover body valve; the piston part is arranged inside the cylinder liner, and the piston part is provided with a piston gas flow channel, which is connected with the pressure input channel in front of the cover body valve, and the piston gas flow channel The output end of the valve is connected with the pressure input port in front of the valve; the piston part includes a connected piston body and a piston rod, the piston rod is provided with a pressure limiting spring, and the end of the piston rod far away from the piston body is provided with a connection with the valve front of the cover body. The output end of the pressure input channel is opposite to the steel ball, and the size of the steel ball is larger than the size of the output end of the pressure input channel in front of the cover body valve. The utility model has the advantages of simple structure and convenient use, the pressure limiting pressure is determined by the pressure limiting spring, and the exhaust gas is not connected with the air, so it is safe and reliable.

Description

Pressure limiting mechanism

technical field

The utility model relates to the technical field of regulating valves, in particular to a pressure limiting mechanism.

Background technique

Self-operated micro-pressure nitrogen sealing valve is used for liquid level nitrogen sealing of oil and chemical storage tanks. The self-operated micro-pressure nitrogen sealing valve makes the nitrogen sealing valve correspond to the change of opening through the volume pressure change caused by the feeding, discharging and air temperature of the storage tank, so as to realize the constant pressure control of the nitrogen sealing micro pressure, and adopts the function of constant pressure control It is energy saving, environmental protection and safety.

The self-operated micro-pressure nitrogen sealing valve is composed of a valve and a pilot. The air source pressure of the pilot is generally supplied after decompression by an air filter reducer. The self-operated micro-pressure nitrogen seal valve is also used in occasions with micro-pressure control of toxic and harmful gases. Since the air filter regulator is a gas consumption balance structure, the air filter regulator is connected with the air, which will pollute the environment and be harmful to health. not safe.

Utility model content

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a pressure limiting mechanism that is simple in structure, easy to use and not connected to the air.

In order to achieve the above purpose and other related purposes, the utility model provides a pressure limiting mechanism, which is arranged on the pressure input port before the valve. The pressure limiting mechanism includes: a cylinder liner, which is arranged on the valve; a cylinder head, It is arranged on the cylinder liner of the cylinder, and the pressure input channel in front of the cover body valve is provided on the cylinder head; the piston part is arranged inside the cylinder liner of the cylinder, and the piston part is provided with a piston gas flow channel. The gas passage of the piston communicates with the pressure input channel before the valve of the cover body, and the output end of the gas passage of the piston communicates with the pressure input port before the valve of the valve; Rod, the piston rod is covered with a pressure limiting spring, the pressure limiting spring is between the piston body and the cylinder liner, and the end of the piston rod far away from the piston body is provided with the The output port of the pressure input channel in front of the cover valve is opposite to the steel ball, and the size of the steel ball is larger than the output port of the pressure input channel in front of the cover valve.

Preferably, the cylinder liner includes a cylinder liner body and a partition, the partition is arranged inside the cylinder liner body, and the partition part divides the inside of the cylinder liner body into a piston cavity connected to a cover body Cavity, the cylinder head is inserted into the connecting cavity of the cover body, the piston member and the pressure limiting spring are both in the piston cavity, and the partition is provided with a through hole for the piston rod to pass through. A through hole, the end of the piston rod away from the piston body is in the connecting cavity of the cover body.

Further, the piston gas flow channel includes a radial flow channel and an axial flow channel connected with the radial flow channel, and the radial flow channel is arranged on the piston rod and connected to the cover body. In the cavity, one end of the axial flow channel communicates with the radial flow channel, and the other end of the axial flow channel communicates with the pre-valve pressure input port of the valve.

Further, the cylinder head is provided with a cover body ventilation cavity, the cover body ventilation cavity communicates with the output end of the pressure input channel in front of the cover body valve, and the cover body ventilation cavity is located in the cover body connecting cavity .

Further, the piston rod is sleeved with a rod dynamic sealing ring, and the rod dynamic sealing ring is in contact with the through hole of the separator.

Further, a piston dynamic sealing ring is sheathed on the piston body, and the piston dynamic sealing ring is in contact with the inner wall of the cylinder liner.

Further, the cylinder head is covered with a cover sealing ring, and the cover sealing ring is in contact with the inner wall of the cylinder liner.

As mentioned above, the pressure limiting mechanism described in the utility model has the following beneficial effects:

When the utility model is used, when the pressure-limiting spring is set to be in the initial state, the steel ball leaves the output port of the pressure input channel in front of the valve of the cover body, and the gas pressure of the pressure input channel in front of the valve of the cover body passes through the gas channel of the piston to the front of the valve of the valve. Pressure input port, when the gas pressure at the front pressure input port of the valve gradually increases, because the gas pressure reacts on the piston body, the spring is compressed, and the steel ball at the left end of the piston rod moves to the front pressure input channel of the valve until the spring set value , the steel ball blocks the output port of the pressure input channel in front of the valve, so that the gas pressure of the pressure input port in front of the valve can be limited within the spring setting value; when the pressure input port in front of the valve is affected by the back end of the valve Gas consumption, the gas pressure at the pre-valve pressure input port of the valve is less than the spring setting value, the pressure limiting spring pushes the piston body to move away from the cylinder head, and the steel ball leaves the output port of the pre-valve pressure input channel of the cover body, the gas pressure Replenish into the pre-valve pressure input port of the valve until it reaches the spring setting value; when the gas pressure of the pre-valve pressure input port of the valve is greater than the spring setting value again, the steel ball blocks the output of the pre-valve pressure input channel of the cover body again mouth. The utility model has the advantages of simple structure and convenient use. The pressure limiting pressure is determined by a pressure limiting spring and is not connected with the air, so it is a safe and reliable pressure limiting mechanism.

Description of drawings

Fig. 1 is a schematic structural diagram of the pressure limiting mechanism of the present invention.

Explanation of reference numbers

1 valve

100 cylinder liner

110 cylinder body

120 dividers

130 piston cavity

140 Cover connection chamber

150 cylinder liner seal

200 cylinder head

210 Cover body valve front pressure input channel

220 Cover body ventilation cavity

230 cover seal

300 Piston pieces

310 Piston Gas Runner

311 radial runner

312 axial channel

320 piston body

321 piston dynamic sealing ring

330 piston rod

331 rod body dynamic sealing ring

400 Compression spring

500 steel balls

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

Please refer to attached picture. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the utility model Therefore, it has no technical substantive meaning. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of The technical content disclosed by the utility model must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of this specification. The applicable scope of the utility model and the change or adjustment of its relative relationship shall also be regarded as the applicable scope of the utility model if there is no substantial change in the technical content.

As shown in Figure 1, the pressure limiting mechanism of the present invention is arranged on the pressure input port in front of the valve 1;

The pressure limiting mechanism includes: a cylinder liner 100, a cylinder head 200, a piston 300, a pressure limiting spring 400 and a steel ball 500;

The cylinder liner 100 is arranged on the pre-valve pressure input port of the valve 1;

The cylinder head 200 is arranged on the cylinder liner 100, and the cylinder head 200 is provided with a pressure input channel 210 in front of the valve of the cover body;

The piston part 300 is arranged inside the cylinder liner 100. The piston part 300 is provided with a piston gas flow channel 310. The piston gas flow channel 310 communicates with the pressure input channel 210 in front of the valve of the cover body. The output end of the piston gas flow channel 310 is connected to the valve. The pressure input port before the valve of 1 is connected;

The piston part 300 includes a connected piston body 320 and a piston rod 330. The input end and the output end of the piston gas flow channel 310 are located on the piston rod 330 and the piston body 320 respectively. The spring 400 is between the piston body 320 and the cylinder liner 100, and the end of the piston rod 330 away from the piston body 320 is provided with a steel ball 500 opposite to the output port of the pressure input channel 210 in front of the cover valve, and the steel ball 500 The size is larger than the size of the output port of the pressure input channel 210 in front of the cover body valve.

When the utility model is used, when the pressure limiting spring 400 is set to be in the initial state, the pressure limiting spring 400 has a certain supporting force on the piston body 320, and the gas enters the valve 1 through the pressure input channel 210 in front of the valve cover and the piston gas flow channel 310. When the gas pressure at the pre-valve pressure input port of valve 1 gradually increases, the surface of the piston body 320 is subjected to a reaction force, the pressure limiting spring 400 is compressed, and the piston rod 330 moves to the left to reach the spring setting. value, the steel ball 500 blocks the output port of the pressure input channel 210 in front of the cover valve, and the pressure input channel 210 in front of the cover valve is closed;

When the pre-valve pressure input port of valve 1 is consumed by the gas at the rear end of valve 1, the gas pressure at the pre-valve pressure input port of valve 1 is lower than the spring setting value, and the setting force provided by the pressure limiting spring 400 to the piston body 320 is greater than that of the piston The reaction force of the body 320, the piston body 320 moves to the right, the steel ball 500 leaves the output port of the pressure input channel 210 in front of the cover valve, and the gas passes through the pressure input channel 210 in front of the cover valve, the radial flow channel 311 and the axial flow channel 312 enters the pre-valve pressure input port of valve 1 for replenishment;

When the gas pressure at the pre-valve pressure input port of valve 1 is greater than the spring setting value again, the pressure limiting spring 400 is compressed again, and the steel ball 500 blocks the output port of the pre-valve pressure input channel 210 of the cover body. Reciprocating in this way, the gas pressure at the pre-valve pressure input port of the valve 1 is always limited to the spring setting value.

The diameter of the steel ball 500 is larger than the inner diameter of the output end of the pressure input channel 210 in front of the valve of the cover body. When the gas in the pressure input port of the valve 1 pushes the piston body 320 to move toward the cylinder head 200, the steel ball 500 can completely block the Live the output end of the pressure input channel 210 in front of the cover body valve.

The cylinder liner 100 includes a cylinder liner body 110 and a partition 120. The partition 120 is arranged inside the cylinder liner body 110. The partition 120 divides the interior of the cylinder liner body 110 into a piston chamber 130 and a cover connecting chamber 140. The cylinder head 200 is screwed into the connecting cavity 140 of the cover body, the piston member 300 and the pressure limiting spring 400 are both located in the piston cavity 130, the partition 120 is provided with a through hole for the piston rod 330 to pass through, and the piston rod 330 is far away from the piston body One end of 320 is in the cover connection cavity 140 . The cylinder head 200 is positioned and screwed into the connecting cavity 140 of the cover; the piston body 320 moves in the piston cavity 130, and the piston body 320 drives the piston rod 330 to move. Since the end of the piston rod 330 away from the piston body 320 is provided with a steel ball 500, The steel ball 500 is located in the cover connecting cavity 140, and is coaxial with the output port of the pressure input channel 210 in front of the cover valve, so that the steel ball 500 can block the output port of the pressure input channel 210 in front of the cover valve or leave the front of the cover valve. The output port of the pressure input channel 210 .

The piston gas channel 310 includes a radial channel 311 and an axial channel 312 communicating with the radial channel 311. The radial channel 311 is arranged on the piston rod 330 and is located in the cover connecting cavity 140. One end of the channel 312 communicates with the radial channel 311 , the other end of the axial channel 312 communicates with the pre-valve pressure input port of the valve 1 , and the other end of the axial channel 312 is the output end of the piston gas channel 310 . Since the end of the piston rod 330 far away from the piston body 320 is provided with a steel ball 500, the gas flowing out from the output port of the pressure input channel 210 before the cover valve passes through the radial flow channel 311 and the axial flow channel 312 in sequence and then enters the center. The pre-valve pressure input port of valve 1.

The cylinder head 200 is provided with a cover vent chamber 220 , which communicates with the output end of the pressure input channel 210 before the cover valve, and the cover vent chamber 220 is located in the cover connection chamber 140 . This structure is convenient for the steel ball 500 to block the output end of the pressure input channel 210 in front of the cover body valve or leave the output end of the pressure input channel 210 in front of the cover body valve, so that the gas can enter the piston gas from the output end of the pressure input channel 210 in front of the cover body valve. Runner 310.

The piston rod 330 is sleeved with a rod body dynamic sealing ring 331 , and the rod body dynamic sealing ring 331 is in contact with the through hole of the separator 120 . The dynamic sealing ring 331 of the rod body prevents the gas discharged from the output end of the pressure input channel 210 in front of the valve of the cover body from entering the piston chamber 130 through the through hole on the separator 120 .

A piston dynamic sealing ring 321 is sheathed on the piston body 320 , and the piston dynamic sealing ring 321 is in contact with the inner wall of the cylinder liner 100 . The piston dynamic sealing ring 321 prevents the gas at the pre-valve pressure input port of the valve 1 from flowing into the piston cavity 130 .

A cover sealing ring 230 is sleeved on the cylinder head 200 , and the cover sealing ring 230 is in contact with the inner wall of the cylinder liner 100 . The cover sealing ring 230 prevents the gas discharged from the output end of the pressure input channel 210 before the cover valve from entering the air.

A cylinder liner sealing ring 150 is provided at the connection between the cylinder liner 100 and the valve 1, and the cylinder liner sealing ring 150 prevents the gas at the pre-valve pressure input port of the valve 1 from entering the air.

The utility model can be applied to a self-operated micro-pressure nitrogen sealing valve. The utility model has a simple structure, is convenient to use, and is not connected to the atmosphere during the voltage stabilization process, so as to realize no gas source loss, and is a safe and reliable pressure limiting mechanism.

To sum up, the utility model effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (7)

1. a limiting mechanism of pressure, is characterized in that, be arranged on the upstream pressure inlet opening of valve (1), described limiting mechanism of pressure comprises:

Cylinder liner (100), is arranged on described valve (1);

Cylinder cap (200), be arranged on described cylinder liner (100), described cylinder cap (200) is provided with lid upstream pressure input channel (210);

Piston piece (300), be arranged at the inside of described cylinder liner (100), described piston piece (300) is provided with piston gas runner (310), described piston gas runner (310) is communicated with described lid upstream pressure input channel (210), and the output terminal of described piston gas runner (310) is communicated with the upstream pressure inlet opening of described valve (1);

Described piston piece (300) comprises the piston only (320) and piston rod (330) that are connected, described piston rod (330) is arranged with pressure limiting spring (400), described pressure limiting spring (400) is between described piston only (320) and described cylinder liner (100), one end away from described piston only (320) of described piston rod (330) is provided with the steel ball (500) relative with the delivery outlet of described lid upstream pressure input channel (210), and the size of described steel ball (500) is greater than the size of the delivery outlet of described lid upstream pressure input channel (210).

2. limiting mechanism of pressure according to claim 1, it is characterized in that: described cylinder liner (100) comprises cylinder sleeve body (110) and divider (120), described divider (120) is arranged at the inside of described cylinder sleeve body (110), the interior separation of described cylinder sleeve body (110) is piston cavity (130) and lid connection chamber (140) by described divider (120), described cylinder cap (200) is inserted in described lid connection chamber (140), described piston piece (300) and described pressure limiting spring (400) are all in described piston cavity (130), described divider (120) be provided with for described piston rod (330) pass run through through hole, one end away from described piston only (320) of described piston rod (330) is in described lid connection chamber (140).

3. limiting mechanism of pressure according to claim 2, it is characterized in that: the shaft orientation flowing channel (312) that described piston gas runner (310) comprises radial flow path (311) and is communicated with described radial flow path (311), described radial flow path (311) is arranged on described piston rod (330), and be in described lid connection chamber (140), one end of described shaft orientation flowing channel (312) is communicated with described radial flow path (311), and the other end of described shaft orientation flowing channel (312) is communicated with the upstream pressure inlet opening of described valve (1).

4. limiting mechanism of pressure according to claim 2, it is characterized in that: described cylinder cap (200) is provided with lid venting cavity (220), described lid venting cavity (220) is communicated with the output terminal of described lid upstream pressure input channel (210), and described lid venting cavity (220) is in described lid connection chamber (140).

5. limiting mechanism of pressure according to claim 2, it is characterized in that: described piston rod (330) is arranged with body of rod dynamic seal ring (331), described body of rod dynamic seal ring (331) contacts with the through hole that runs through of described divider (120).

6. limiting mechanism of pressure according to claim 2, it is characterized in that: described piston only (320) is arranged with piston dynamic seal ring (321), the contact internal walls of described piston dynamic seal ring (321) and described cylinder liner (100).

7. limiting mechanism of pressure according to claim 2, it is characterized in that: described cylinder cap (200) is arranged with lid seal ring (230), the contact internal walls of described lid seal ring (230) and described cylinder liner (100).