CN218761734U

CN218761734U - Fluid control valve

Info

Publication number: CN218761734U
Application number: CN202222717566.9U
Authority: CN
Inventors: 梅剑; 林海峰; 徐道敏
Original assignee: Simeon Technology Co ltd
Current assignee: Simeon Technology Co ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-03-28
Anticipated expiration: 2032-10-13

Abstract

The utility model provides a fluid control valve belongs to compressor technical field. It has solved the not enough technical problem of current compressor control valve sensitivity. The fluid control valve comprises a valve body and a piston valve core with different diameters, wherein a valve hole and a fluid channel are formed in the valve body, the piston valve core is positioned in the valve hole, the small end of the piston valve core penetrates through the bottom surface of the valve hole and is inserted into the fluid channel to control the opening and closing of the fluid channel, a control cavity is formed between the outer side of the large end of the piston valve core and the inner wall of the valve hole, a movable cavity is formed between one side, close to the small end, of the large end of the piston valve core and the inner wall of the valve hole, a compensation hole communicated with the outside is formed in the inner side wall of the valve hole, and the compensation hole is communicated with the movable cavity all the time. The fluid control valve is beneficial to improving the control sensitivity.

Description

Fluid control valve

Technical Field

The utility model belongs to the technical field of the compressor, a fluid control valve is related to.

Background

Control valves are widely used in various industries, and are a major component of compressors in particular. In the compressor, a two-position two-way control valve is generally arranged on a pipeline behind an oil filter, and has two main functions: firstly, after the compressor is started, the two-position two-way control valve is opened in time, and oil enters the main machine through an oil way in the two-position two-way control valve, so that the lubrication and cooling of the compressor are ensured; and secondly, after the compressor is stopped, the two-position two-way control valve is closed in time, and a channel for supplying oil to the host is cut off, so that accidents such as the reverse rotation of the compressor, the overflow of lubricating oil from an air inlet and the like are avoided.

The applicant previously filed a two-position two-way control valve with a piston with unequal diameters, with a valve body provided with a fluid inlet, a fluid outlet and a control port, and an end cover arranged at one end of the valve body, and is characterized in that the unequal diameter piston is arranged in a cylinder body of the valve body, a sealing ring is sleeved on the piston, the unequal diameter piston is integrally made into piston sections with three different diameters of large diameter, medium diameter and small diameter, and the small diameter piston section faces the fluid inlet.

The application range of the product is wide, the service life of the product is long, and the applicant continues to improve the product on the basis of the application range and aims to further improve the working sensitivity of the product.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a fluid control valve, the utility model aims to solve the technical problem that: how to ensure the operational sensitivity of the control valve.

The purpose of the utility model can be realized by the following technical proposal:

the fluid control valve is characterized in that a movable cavity is formed between one side of the large end of the piston valve core, which is close to the small end, and the inner wall of the valve hole, and a compensation hole communicated with the outside is formed in the inner side wall of the valve hole, and the compensation hole is communicated with the movable cavity all the time.

The valve body is provided with a valve hole, the piston valve core is arranged in the valve body from the valve hole, the small end of the piston valve core penetrates through the bottom surface of the valve hole and is inserted into the fluid channel, when the fluid channel is required to be controlled to be closed, fluid can enter the control cavity, and as the large end of the piston valve core has a larger area, a larger thrust can be formed on the piston valve core in the control cavity under certain fluid pressure to enable the piston valve core to move towards one side where the small end is located, and then the fluid channel is closed after the piston valve core moves in place; when the fluid channel needs to be opened, the fluid pressure supply of the control port can be released, the pressure in the control cavity is reduced, and the pressurized fluid acts on the small end of the piston valve core to jack the small end of the piston valve core, so that the fluid channel is opened. Because the peripheral surface of the large end of the piston valve core is in sealing fit with the inner side wall of the valve hole, and the small end penetrates through the bottom surface of the valve hole, a movable cavity is formed between one side of the large end of the piston valve core, which is close to the small end, and the inner wall of the valve hole; the compensation hole communicated with the outside is formed in the inner side wall of the valve hole, so that the compensation hole is always communicated with the movable cavity when the piston valve core reciprocates, the compensation hole can be communicated with a normal pressure environment when the piston valve core works, the piston valve core cannot block the movement fluency due to high pressure or negative pressure formed in the movable cavity when the piston valve core reciprocates, and the sensitivity is improved; or the compensation hole is communicated with the variable pressure environment, when the fluid channel needs to be closed, the variable pressure environment is negative pressure, and when the fluid channel needs to be opened, the variable pressure environment is switched to high pressure, so that the movement of the piston valve core is accelerated, and the sensitivity is further improved.

In the fluid control valve, the fluid control valve further comprises an end cover which is fixedly connected with the valve body and seals the opening of the valve hole, the valve body is provided with a control port, a control cavity communicated with the control port is formed between the large end of the piston valve core and the end cover, and the inlet of the fluid channel is opposite to the small end face of the piston valve core. The end cover seals the opening of the valve hole to provide a closed environment for the piston valve core, the valve body is provided with the control port, so that fluid can enter the control cavity through the control port, the small end of the piston valve core is opposite to the inlet of the fluid channel, the inlet of the fluid channel can be sealed in front after the piston valve core moves in place, the small end of the large end can keep front stress, and the subsequent normal opening is ensured.

In the fluid control valve, the large end surface of the piston valve core is provided with a limiting boss, the radial dimension of the limiting boss is smaller than that of the fluid channel inlet, and when the fluid channel is opened, the piston valve core moves towards the side where the large end is located and enables the limiting boss to be limited and abutted against the end cover. The limiting boss is arranged on the surface of the large end of the piston valve core, so that the radial size of the limiting boss is smaller than that of the inlet of the fluid channel, and the limiting boss with the small area of the large end of the piston valve core is limited and abutted against the end cover when the fluid channel is opened, so that the closing effect caused by insufficient diffusion of fluid media due to the fact that the whole end face is attached to the end cover is avoided.

In the fluid control valve, the edge of the limiting boss is subjected to chamfering transition treatment. The edge of the limiting boss is subjected to chamfering transition treatment, so that the contact area between the limiting boss and the end cover is further reduced, and the response speed of the control valve during closing is improved.

In the fluid control valve, the valve body is further provided with an adjusting screw hole, and the inner end of the adjusting screw hole is communicated with the fluid channel. Through setting up the regulation screw that communicates with fluid passage on the valve body, operating personnel can be at the regulation screw bolt installation bolt like this, through the through-flow volume of control bolt in fluid passage.

In the fluid control valve, the fluid passage includes a communicating section in a straight tube shape, an axial line of the adjusting screw hole is perpendicular to an axial line of the communicating section, and a radial dimension of the adjusting screw hole is larger than a radial dimension of the communicating section. Through setting up fluid passage including the intercommunication section that is the straight tube form, make the axial lead of adjusting the screw perpendicular with the axial lead of intercommunication section to the radial dimension that sets up the adjusting screw is greater than the radial dimension of intercommunication section, can seal whole intercommunication section better when the volume of feeding is the biggest at the bolt of installation like this, thereby feed through the bolt and realize stable effect of closing when the piston case breaks down and can't close.

In the fluid control valve, the inner edge of the inlet and outlet of the fluid channel, the inner edge of the control port and the inner edge of the compensation hole are provided with connecting threads. The inner edges of the inlet and the outlet of the fluid channel, the inner edge of the control port and the inner edge of the compensation hole are provided with connecting threads, so that the control valve is conveniently connected with a fluid pipeline joint through threads when being installed.

In the fluid control valve, the piston valve core is sleeved with an annular sealing element, and the sealing element is abutted against the inner wall of the valve hole to form sealing. The sealing element can form better sealing effect between the piston valve core and the inner wall of the valve hole, and the influence on the control effect caused by fluid leakage and channeling is avoided.

Compared with the prior art, the utility model has the advantages as follows:

the fluid control valve enables the compensation hole to be communicated with the outside all the time when the piston valve core reciprocates by arranging the compensation hole communicated with the outside on the inner side wall of the valve hole, so that the compensation hole can be communicated with a normal pressure environment when working, the piston valve core cannot block the motion smoothness due to high pressure or negative pressure formed in the movable cavity when reciprocating, and the sensitivity is improved; or the compensation hole is communicated with the variable pressure environment, when the fluid channel needs to be closed, the variable pressure environment is negative pressure, and when the fluid channel needs to be opened, the variable pressure environment is switched to high pressure, so that the movement of the piston valve core is accelerated, and the sensitivity is further improved.

Drawings

Fig. 1 is a schematic cross-sectional view of the closed state of the fluid channel in this embodiment.

Fig. 2 isbase:Sub>A schematic view of the cross-sectional structurebase:Sub>A-base:Sub>A in fig. 1.

Fig. 3 is a schematic cross-sectional view of the fluid channel in the open state of the present embodiment.

In the figure, 1, a valve body; 11. a valve bore; 12. a control port; 13. a fluid channel; 131. a communicating section; 14. a compensation hole; 15. adjusting the screw hole;

2. an end cap;

3. a piston valve core; 31. a limiting boss;

4. a control chamber; 5. a movable cavity; 6. and a seal.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1-3, the fluid control valve includes a valve body 1, an end cap 2 and a piston valve core 3 with different diameters, the valve body 1 has a valve hole 11, a control port 12 and a fluid channel 13 therein, the end cap 2 is fixed with the valve body 1 and seals an opening of the valve hole 11, the piston valve core 3 is located in the valve hole 11, a small end of the piston valve core 3 penetrates through a bottom surface of the valve hole 11 and is inserted into the fluid channel 13, an inlet of the fluid channel 13 is opposite to a small end surface of the piston valve core 3, the piston valve core 3 can reciprocate along an axial direction of the valve hole 11 to control opening and closing of the fluid channel 13, a control cavity 4 communicated with the control port 12 is provided between a large end of the piston valve core 3 and the end cap 2, a movable cavity 5 is provided between the large end of the piston valve core 3 and the bottom surface of the valve hole 11, an inner side wall of the valve hole 11 has a compensation hole 14 communicated with the outside, and the compensation hole 14 is always communicated with the movable cavity 5. The valve body 1 is provided with a valve hole 11, the piston valve core 3 is arranged in the valve body 1 from the valve hole 11, the end cover 2 seals the opening of the valve hole 11 to provide a sealed environment for the piston valve core 3, the small end of the piston valve core 3 penetrates through the bottom surface of the valve hole 11 to be inserted in the fluid channel 13 and is opposite to the inlet of the fluid channel 13, when the fluid channel 13 needs to be controlled to be sealed, fluid can enter the control cavity 4 through the control port 12, and because the large end of the piston valve core 3 has a larger area, a larger thrust can be formed in the control cavity 4 to the piston valve core 3 under a certain fluid pressure to enable the piston valve core 3 to move towards one side of the inlet, and then the fluid channel 13 is sealed after the piston valve core is moved to the right position; when the fluid channel 13 needs to be opened, the fluid pressure supply of the control port 12 can be released, the pressure in the control cavity 4 is reduced, and the pressurized fluid acts on the small end of the piston valve core 3 to jack the small end of the piston valve core and open the fluid channel 13; because the peripheral surface of the large end of the piston valve core 3 is in sealing fit with the inner side wall of the valve hole 11, and the small end penetrates through the bottom surface of the valve hole 11, a movable cavity 5 is formed between the large end of the piston valve core 3 and the bottom surface of the valve hole 11. The compensation hole 14 communicated with the outside is formed in the inner side wall of the valve hole 11, so that the compensation hole 14 is always communicated with the movable cavity 5 when the piston valve core 3 reciprocates, the compensation hole 14 can be communicated with a normal pressure environment when working, the piston valve core 3 cannot block the movement fluency due to high pressure or negative pressure formed in the movable cavity 5 when reciprocating, and the sensitivity is improved; or the compensation hole 14 is communicated with the variable pressure environment, when the fluid channel 13 needs to be closed, the variable pressure environment is negative pressure, and when the fluid channel 13 needs to be opened, the variable pressure environment is switched to high pressure, so that the movement of the piston valve core 3 is accelerated, and the sensitivity is further improved. Further, the large end surface of the piston valve core 3 is provided with a limit boss 31, the radial dimension of the limit boss 31 is smaller than the radial dimension of the inlet of the fluid channel 13, when the fluid channel 13 is opened, the piston valve core 3 moves towards the large end side and the limit boss 31 is limited and abutted against the end cover 2. The limiting boss 31 is arranged on the surface of the large end of the piston valve core 3, so that the radial size of the limiting boss 31 is smaller than that of the inlet of the fluid channel 13, and the limiting boss 31 with the small area of the large end of the piston valve core 3 is limited and abutted against the end cover 2 when the fluid channel 13 is opened, so that the phenomenon that the whole end face is attached to the end cover 2 to cause the fluid medium not to be fully diffused to influence the closing effect is avoided. Preferably, the edge of the limiting boss 31 is chamfered. The edge of the limiting boss 31 is subjected to chamfering transition treatment, so that the contact area between the limiting boss 31 and the end cover 2 is favorably further reduced, and the response speed of the control valve during closing is improved. An annular sealing element 6 is sleeved on the piston valve core 3, and the sealing element 6 is abutted against the inner wall of the valve hole 11 to form sealing. The sealing element 6 can form better sealing effect between the piston valve core 3 and the inner wall of the valve hole 11, and the influence on the control effect caused by fluid leakage and channeling is avoided.

As shown in fig. 1 to 3, the valve body 1 is further provided with an adjustment screw hole 15, and an inner end of the adjustment screw hole 15 communicates with the fluid passage 13. By providing the valve body 1 with an adjustment screw hole 15 communicating with the fluid passage 13, an operator can install a bolt in the adjustment screw hole 15 and control the passing flow rate of the fluid passage 13 by controlling the feeding amount of the bolt in the fluid passage 13. Preferably, the fluid passage 13 includes a communicating section 131 in a straight tube shape, and an axis of the adjusting screw hole 15 is perpendicular to an axis of the communicating section 131, and a radial dimension of the adjusting screw hole 15 is larger than a radial dimension of the communicating section 131. Through setting up fluid passage 13 and including being the intercommunication section 131 of straight tube form, make the axial lead of adjusting screw 15 perpendicular with the axial lead of intercommunication section 131 to set up the radial dimension that adjusting screw 15 is greater than the radial dimension of intercommunication section 131, can seal whole intercommunication section 131 better when the feed volume is the biggest at the bolt of installation like this, thereby realize stable effect of closing through the bolt feed when piston case 3 breaks down and can't close. The inner edges of the inlet and outlet ports of the fluid passage 13, the inner edge of the control port 12 and the inner edge of the compensation hole 14 are provided with connecting threads. The inner edges of the inlet and outlet of the fluid passage 13, the inner edge of the control port 12 and the inner edge of the compensation hole 14 are provided with connecting threads, so that the control valve is conveniently connected with a fluid pipeline connector through threads when being installed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The fluid control valve comprises a valve body (1) and a piston valve core (3) with different diameters, wherein the valve body (1) is provided with a valve hole (11) and a fluid channel (13), the piston valve core (3) is positioned in the valve hole (11), the small end of the piston valve core (3) penetrates through the bottom surface of the valve hole (11) and is inserted in the fluid channel (13) to control the opening and closing of the fluid channel (13), a control cavity (4) is formed between the outer side of the large end of the piston valve core (3) and the inner wall of the valve hole (11), the fluid control valve is characterized in that a movable cavity (5) is formed between one side, close to the small end, of the large end of the piston valve core (3) and the inner wall of the valve hole (11), a compensation hole (14) communicated with the outside is formed in the inner side wall of the valve hole (11), and the compensation hole (14) is communicated with the movable cavity (5) all the time.

2. The fluid control valve according to claim 1, further comprising an end cap (2) fixed to the valve body (1) and closing an opening of the valve hole (11), wherein the valve body (1) has a control port (12), the control chamber (4) communicated with the control port (12) is formed between the large end of the piston valve core (3) and the end cap (2), and an inlet of the fluid channel (13) is opposite to the small end face of the piston valve core (3).

3. A fluid control valve according to claim 2, characterized in that the large end surface of the piston spool (3) is provided with a limit boss (31), the radial dimension of the limit boss (31) is smaller than the radial dimension of the inlet of the fluid passage (13), and when the fluid passage (13) is opened, the piston spool (3) moves towards the side of the large end and limits and abuts the limit boss (31) and the end cover (2).

4. A fluid control valve according to claim 2, characterised in that the edge of the stop boss (31) is chamfered.

5. A fluid control valve according to claim 1, 2 or 3, characterized in that the valve body (1) is further provided with an adjusting screw hole (15), and the inner end of the adjusting screw hole (15) is communicated with the fluid passage (13).

6. A fluid control valve according to claim 5, wherein the fluid passage (13) comprises a communicating section (131) in the form of a straight tube, the axis of the adjusting screw hole (15) is perpendicular to the axis of the communicating section (131), and the radial dimension of the adjusting screw hole (15) is larger than the radial dimension of the communicating section (131).

7. A fluid control valve according to claim 1 or 2 or 3, characterized in that the inner edges of the inlet and outlet openings of the fluid channel (13), the control opening (12) and the compensation bore (14) are provided with connecting threads.

8. The fluid control valve according to claim 1, 2 or 3, characterized in that the piston spool (3) is sleeved with an annular sealing member (6), and the sealing member (6) abuts against the inner wall of the valve hole (11) to form a seal.