CN112081940B

CN112081940B - Control valve

Info

Publication number: CN112081940B
Application number: CN201910516770.4A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2023-05-16
Anticipated expiration: 2039-06-14
Also published as: CN112081940A

Abstract

The invention provides a control valve, a valve body part comprises a first sealing gasket, a second sealing gasket, a valve core and a first one-way fluid control part, wherein the first sealing gasket is abutted against the valve core, in a valve closing state, the first sealing gasket is abutted against the valve core to form a first sealing part, the second sealing gasket is abutted against the valve core to form a second sealing part, a valve cavity of the control valve isolated by the first sealing part and the second sealing part is an inner cavity, the first one-way fluid control part comprises a first one-way valve core and a first one-way valve opening, the first one-way valve core can be abutted against or separated from the first one-way valve opening, the valve body part comprises a first flow path port, and fluid flows in one direction from the first flow path port to the inner cavity through the first one-way valve port of the first one-way valve opening. Compared with the prior art, the pressure of fluid received by two sides of the first sealing gasket tends to balance, so that the acting force of the first sealing gasket on the valve core is reduced, and the torque required by the valve rod to drive the valve core to rotate when the valve is opened is reduced, thereby improving the valve opening performance of the control valve.

Description

Control valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a control valve.

Background

Fig. 1 is a schematic diagram showing the structure of a control valve according to the background art.

As shown in fig. 1, the control valve includes a valve body 01, a valve seat 02, a first connection pipe 03, a second connection pipe 04, a valve stem 05, and a valve element 06. The valve body 01 is fixedly connected with the valve seat 02, the valve body 01 is fixedly connected with the first connecting pipe 03, and the valve seat 02 is fixedly connected with the second connecting pipe 04. The valve core 06 can be driven to rotate by rotating the valve rod 05 to realize valve opening and valve closing. In this control valve, a seal 07 is provided between a valve element 06 and a valve body 01, and a seal 08 is provided between the valve element 06 and a valve seat 02. When high-pressure fluid flows in from the first connecting pipe 03, the left side of the sealing element 07 is high pressure, the right side of the sealing element 07 is low pressure, the differential pressure force born by the sealing element 07 acts on the valve core 06, and the torque required by the valve rod 05 to drive the valve core 06 to rotate during valve opening becomes large, so that the valve opening performance of the control valve can be influenced.

In view of this, it is an improvement of the valve opening performance of the control valve that a person skilled in the art has provided.

Disclosure of Invention

The invention aims to provide a control valve, which comprises a valve body part, wherein the valve body part comprises a valve body, a valve rod, a first valve seat, a second valve seat, a first sealing gasket, a second sealing gasket and a valve core, the valve body is fixedly connected with the first valve seat, the valve body is fixedly connected with the second valve seat, the valve core is positioned between the first valve seat and the second valve seat, and the valve rod can drive the valve core to circumferentially rotate;

the first sealing gasket is arranged between the first valve seat and the valve core, the second sealing gasket is arranged between the second valve seat and the valve core, the valve body part comprises a first sealing part and a second sealing part, the first sealing gasket is abutted with the valve core to form the first sealing part in the valve closing state of the control valve, the second sealing gasket is abutted with the valve core to form the second sealing part, the valve cavity of the control valve isolated by the first sealing part and the second sealing part is defined as an inner cavity, the first valve seat is provided with a first one-way fluid control part, the first one-way fluid control part comprises a first one-way valve core and a first one-way valve opening, the first one-way valve core can be abutted against or separated from the first one-way valve opening, the valve body part comprises a first fluid port, and fluid can flow from the first fluid port to the inner cavity in a one-way through the first one-way valve port of the first one-way valve opening.

The invention provides a control valve, a valve body part comprises a first sealing gasket, a second sealing gasket, a valve core and a first one-way fluid control part, wherein the first sealing gasket is abutted against the valve core, in a valve closing state, the first sealing gasket is abutted against the valve core to form a first sealing part, the second sealing gasket is abutted against the valve core to form a second sealing part, a valve cavity of the control valve isolated by the first sealing part and the second sealing part is an inner cavity, the first one-way fluid control part comprises a first one-way valve core and a first one-way valve opening, the first one-way valve core can be abutted against or separated from the first one-way valve opening, the valve body part comprises a first flow path port, and fluid flows in one direction from the first flow path port to the inner cavity through the first one-way valve port of the first one-way valve opening. Compared with the prior art, in the valve closing state of the control valve, the pressure of fluid received by two sides of the first sealing gasket tends to be balanced, so that the acting force of the first sealing gasket on the valve core is reduced, the torque required by the valve rod to drive the valve core to rotate when the valve is opened is reduced, and the valve opening performance of the control valve is improved.

Drawings

Fig. 1: background art a schematic cross-sectional view of a control valve;

fig. 2: the invention provides a schematic cross-section of a control valve;

fig. 3: a partial enlarged schematic view at I in fig. 2;

fig. 4: FIG. 2 is a schematic view of a first valve seat;

fig. 5: the valve stem is schematically shown in fig. 2.

Fig. 2 to 5:

1-valve body part, 10-valve cavity, 100-inner cavity, 101-first cavity, 102-second cavity;

104-annular chamber, 11-valve body, 111-body, 112-extension;

12-first valve seat, 12' -second valve seat, 120-first fluid port;

120' -second fluid port, 121-large diameter section, 122-small diameter section;

123-through holes, 1231-large-diameter hole sections, 1232-small-diameter hole sections;

125-annular groove, 1251-bottom of annular groove, 13-valve stem, 131-flange portion;

14-valve core, 141-groove, 15-first sealing gasket and 151-spherical surface;

15' -second gasket, 16-first unidirectional fluid control member;

161-a first one-way valve core, 162-a first one-way valve opening part, 1620-a first one-way valve opening;

a 16 '-second unidirectional fluid control component, 161' -second unidirectional spool;

162 '-second check valve mouth, 1620' -second check valve port;

17-bearing member, 18-O-ring, 19-first seal, 19' -second seal;

a-first connecting pipe and B-second connecting pipe;

2-drive part, 21-stator part, 22-rotor part;

3-gear reduction unit, 31-input gear, 32-output gear rack;

4-housing part, 41-reduced diameter portion.

Detailed Description

The core of the invention is to provide a control valve, by arranging a first unidirectional fluid control part on a first valve seat, the pressure of fluid on two sides of a first sealing gasket tends to be balanced in a Guan Fazhuang state, the acting force of the first sealing gasket on a valve core is reduced, and the torque required by a valve rod to drive the valve core to rotate when the valve is opened is reduced, so that the valve opening performance of the control valve is improved.

In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

It should be noted that, the terms of upper and lower isotropic terms are defined in fig. 2 to 5 by locating the parts in the drawings and the positions of the parts with respect to each other, only for the sake of clarity and convenience in expressing the technical solutions. It should be understood that the use of directional terms herein should not be construed to limit the scope of the application as claimed.

Fig. 2: the invention provides a schematic cross-section of a control valve; fig. 3: a partial enlarged schematic view at I in fig. 2; fig. 4: FIG. 2 is a schematic view of a first valve seat; fig. 5: the valve stem is schematically shown in fig. 2.

As shown in fig. 2 and 3, the valve body member 1 includes a valve body 11, a first valve seat 12, a second valve seat 12', a valve stem 13, a valve element 14, a first packing 15, a second packing 15', a first unidirectional fluid control member 16, a first adapter a, and a second adapter B. The valve body 11 is approximately hollow and tubular, the first connecting pipe A is welded and fixed with the first valve seat 12, the first valve seat 12 is welded and fixed with one end of the valve body 11, the second connecting pipe B is welded and fixed with the second valve seat 12', and the second valve seat 12' is welded and fixed with the other end of the valve body 11. Of course, the first valve seat 12 and the second valve seat 12' may be screwed to the valve body 11. The first valve seat 12 includes a first fluid port 120 and the second valve seat 12 'includes a second fluid port 120'. The valve element 14 is substantially spherical and is provided in the valve chamber 10 of the control valve, between the first valve seat 12 and the second valve seat 12'. The upper end of the valve rod 13 is connected with a key groove of an output gear frame 32 of the gear reduction device 3, the output gear frame 32 can drive the valve rod 13 to rotate, the lower end of the valve rod 13 stretches into a groove 141 of the valve core 14 and is connected with the key groove of the valve core 14, and the valve rod 13 can drive the valve core 14 to rotate circumferentially. The first sealing gasket 15 is arranged between the first valve seat 12 and the valve core 14, and the first sealing gasket 15 is abutted against the valve core 14; the second gasket 15' is provided between the second valve seat 12' and the valve element 14, and the second gasket 15' abuts against the valve element 14. The valve body member 1 includes a first sealing portion 19 and a second sealing portion 19', and in the valve closing state of the control valve, the first sealing gasket 15 abuts against the valve element 14 to form the first sealing portion 19, and the second sealing gasket 15 abuts against the valve element 14 to form the second sealing portion 19', so that a space separated by the first sealing portion 19 and the second sealing portion 19' defining the valve chamber 10 is the inner chamber 100.

In the present embodiment, as shown in fig. 3, the first valve seat 12 is provided with the first one-way fluid control member 16 including the first one-way valve element 161 and the first one-way valve opening portion 162. The first check valve element 161 can be abutted against or separated from the first check valve opening 162 under the driving of the fluid, and when the first check valve element 161 is separated from the first check valve opening 162, the fluid can flow unidirectionally from the first fluid port 120 to the inner cavity 100 through the first check valve port 1620 of the first check valve opening 162.

In this embodiment, by providing the first one-way fluid control member 16, fluid in the first fluid port 120 acts on the first one-way valve element 161 to disengage the first one-way valve port 162 and fluid flows into the interior chamber 100 through the first one-way valve port 1620. In this way, under the valve closing state, the fluid pressure on two sides of the first sealing gasket 15 tends to be balanced, so that the acting force of the first sealing gasket 15 on the valve core 14 is reduced, the torque required by the valve rod 13 to drive the valve core 14 to rotate when the valve is opened is reduced, and the valve opening performance of the control valve is improved.

Further, as shown in fig. 2, 3 and 4, the first valve seat 12 is substantially cylindrical and includes a large-diameter section 121 and a small-diameter section 122, the small-diameter section 122 is close to the valve core 14, and the large-diameter section 121 is fixedly connected to one end of the valve body 11. An annular chamber 104 is provided between the outer peripheral wall of the small diameter section 122 and the inner wall of the valve body 11, and the inner chamber 100 includes the annular chamber 104.

The first valve seat 12 is provided with a through hole 123, and when the first check valve body 161 is separated from the first check valve opening 162, the through hole 123 communicates the first fluid port 120 with the annular chamber 104. Specifically, the through hole 123 includes a large-diameter hole segment 1231 and a small-diameter hole segment 1232, the large-diameter hole segment 1231 being close to the annular chamber 104, the small-diameter hole segment 1232 being close to the first fluid port 120, a first stepped portion 124 being formed between the large-diameter hole segment 1231 and the small-diameter hole segment 1232, the first stepped portion 124 functioning as the first check valve portion 162.

In this embodiment, the first check valve element 161 is a steel ball, and the distance H between the outer peripheral wall of the small diameter section 122 and the inner wall of the valve body 11 is not greater than the diameter of the steel ball, so that the inner wall of the valve body 11 serves as a stop portion to limit the movement stroke of the first check valve element 161. Of course, the first check valve body 161 is not limited to a spherical shape, and may be tapered, cylindrical, or the like, as long as it can be brought into contact with the first check valve opening 162 to realize sealing and release to realize a conduction function.

Further, as shown in fig. 2 and 3, the valve body part 1 further includes an O-ring 18, one end of the first valve seat 12 near the valve core 14 is provided with an annular groove 125, the O-ring 18 is disposed in the annular groove 125, the inner side wall of the first sealing pad 15 is provided with a spherical surface 151, the spherical surface 151 is in abutting fit with the outer surface of the valve core 14, the outer side wall of the first sealing pad 15 abuts against one side of the O-ring 18, and the other side of the O-ring 18 abuts against the bottom 1251 of the annular groove 125.

As shown in fig. 2, in the present embodiment, the control valve is a two-way control valve, the second valve seat 12' is provided with a second one-way fluid control member 16', the second valve seat 12' has the same structure as the first valve seat 12, the second gasket 15' has the same structure as the first gasket 15, and the second one-way fluid control member 16' has the same structure as the first one-way fluid control member 16. Specifically, the second unidirectional fluid control member 16 'includes a second unidirectional valve core 161' and a second unidirectional valve opening 162', and the second unidirectional valve core 161' can abut against or leave the second unidirectional valve opening 162 'under the driving of the fluid, and when the second unidirectional valve core 161' leaves the second unidirectional valve opening 162', the fluid flows unidirectionally from the second fluid port 120' to the inner cavity 100 through the second unidirectional valve opening 1620 'of the second unidirectional valve opening 162'.

Specifically, the high-pressure fluid is defined to flow in the forward direction from the first connection pipe a and the high-pressure fluid is defined to flow in the reverse direction from the second connection pipe B. The forward inflow of the high-pressure fluid will be described below as an example. After the high-pressure fluid flows in from the first connecting pipe A, the high-pressure fluid passes through the first fluid port 120, the first one-way valve core 161 is flushed away by the fluid pressure, the first one-way valve core 161 is separated from the first one-way valve opening 162, the high-pressure fluid flows through the first one-way valve opening 1620, and then passes through the through hole 123 to reach the inner cavity 100; since the second valve seat 12' has the same structure as the first valve seat 12, the second one-way fluid control member 16' has the same structure as the first one-way fluid control member 16, and the fluid entering the inner chamber 100 presses the second one-way valve core 161' of the second one-way fluid control member 16' against the second one-way valve opening 162', and the second one-way valve opening 1620' is closed, so that the high-pressure fluid does not enter the second fluid port 120' and does not flow out of the second adapter tube B. The same applies to the reverse direction, and the high-pressure fluid flowing in from the second connection pipe B can enter the inner chamber 100, but does not flow out from the first connection pipe a. That is, the first unidirectional fluid control member 16 and the second unidirectional fluid control member 16' function as unidirectional fluid communication. Thus, the pressure of the fluid on both sides of the sealing gasket on the high pressure side tends to be balanced no matter in the forward direction or the reverse direction, the acting force of the sealing gasket on the valve core 14 on the high pressure side (the first sealing gasket 15 in the forward direction and the second sealing gasket 15' in the reverse direction) is reduced, so that the torque required when the valve rod 13 drives the valve core 14 to rotate during valve opening is reduced, and the valve opening action performance of the control valve can be improved.

The control valve in the present embodiment may be an electric control valve. The electrically operated control valve comprises, in addition to the valve body part 1 described in the above embodiments, a drive device 2, a gear reduction device 3, a housing part 4 and a bearing part 5. The gear reduction unit 3 is arranged in the housing part 4.

As shown in fig. 2, the driving member 2 includes a stator member 21 and a rotor member 22, and the rotor member 22 can be driven to rotate circumferentially by energizing the stator member 21. The gear reduction unit 3 is specifically a planetary gear mechanism, and includes an input gear 31 and an output gear carrier 32, and the rotor member 22 can drive the input gear 31 to rotate, and the rotation of the input gear 31 is transmitted to the output gear carrier 32 to drive the output gear carrier 32 to rotate. Because the output gear frame 32 is matched with the key groove of the valve rod 13, the output gear frame 32 can drive the valve rod 13 to rotate, the valve rod 13 is matched with the key groove of the valve core 14, and the valve rod 13 can drive the valve core 14 to rotate to realize valve opening, valve closing and flow regulation of the electric control valve.

As shown in fig. 2 and 5, the lower end of the housing member 4 includes a reduced diameter portion 41, the valve body 11 includes a tubular body 111 and an extension portion 112 extending from the circumferential outer edge of the body 111, and the reduced diameter portion 41 of the housing member 4 is fixedly connected to the extension portion 112 of the valve body 11. The bearing member 5 is made of wear-resistant material, and is sleeved on the outer periphery of the valve rod 13, the outer periphery of the bearing member 5 is fixedly connected with the diameter-reduced part 41 or the extension part 112, the outer periphery of the valve rod 13 is provided with a flange part 131, the flange part 131 is positioned below the bearing member 5, and the flange part 131 is abutted with the lower end of the bearing member 5 to limit the valve rod 13 to axially move upwards. Because the valve rod 13 is matched with the groove 141 of the valve core 14 through key grooves, a certain gap is reserved between the key grooves, and the valve rod 13 can move upwards axially in the rotation process of the control valve, so that the planetary gear mechanism can be poor in operation or even blocked. By this arrangement, the upward movement of the valve stem 13 can be restricted, and the risk of poor operation or even jamming of the planetary gear mechanism is reduced.

The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims

1. The control valve comprises a valve body part, wherein the valve body part comprises a valve body, a valve rod, a first valve seat, a second valve seat, a first sealing gasket, a second sealing gasket and a valve core, the valve body is fixedly connected with the first valve seat, the valve body is fixedly connected with the second valve seat, the valve core is positioned between the first valve seat and the second valve seat, and the valve rod can drive the valve core to circumferentially rotate;

the valve is characterized in that the first sealing gasket is arranged between the first valve seat and the valve core, the second sealing gasket is arranged between the second valve seat and the valve core, the valve body part comprises a first sealing part and a second sealing part, the first sealing gasket is abutted with the valve core to form the first sealing part in the valve closing state of the control valve, the second sealing gasket is abutted with the valve core to form the second sealing part, a valve cavity of the control valve isolated by the first sealing part and the second sealing part is defined as an inner cavity, the first valve seat is provided with a first unidirectional fluid control part, the first unidirectional fluid control part comprises a first unidirectional valve core and a first unidirectional valve opening part, the first unidirectional valve core can be abutted with or separated from the first unidirectional valve opening part, the valve body part comprises a first fluid port, and fluid can flow from the first fluid port to the inner cavity through the first unidirectional valve port of the first unidirectional valve opening part;

the first valve seat is approximately cylindrical, the first valve seat comprises a large-diameter section and a small-diameter section, the small-diameter section is close to the valve core, an annular cavity is formed between the outer peripheral wall of the small-diameter section and the inner wall of the valve body, the inner cavity comprises the annular cavity, the first valve seat comprises a through hole, the first fluid port is formed in the first valve seat, and when the first one-way valve core leaves the first one-way valve opening, the through hole is communicated with the first fluid port and the annular cavity.

2. The control valve of claim 1, wherein the large diameter section is fixedly connected to one end of the valve body.

3. The control valve of claim 2, wherein the through bore includes a large diameter bore section and a small diameter bore section, the large diameter bore Duan Kaojin the annular cavity, the small diameter bore Duan Kaojin the first fluid port, a first step formed between the large diameter bore section and the small diameter bore section as the first one-way valve port portion.

4. The control valve of claim 2, wherein the first one-way valve element is a steel ball, and the distance H between the outer peripheral wall of the small diameter section and the inner wall of the valve body is no greater than the diameter of the first one-way valve element.

5. The control valve of any of claims 1-4, wherein a first annular groove is provided at an end of the first valve seat adjacent the valve spool, an O-ring is disposed in the first annular groove, a spherical surface is provided on an inner side wall of the first gasket, the spherical surface mates with an outer surface of the valve spool, an outer side wall of the first gasket abuts the O-ring, and the O-ring abuts a bottom of the first annular groove.

6. A control valve according to any one of claims 1 to 4, wherein the control valve is an electrically operated control valve, further comprising a drive means and a gear reduction means, the drive means comprising a stator part and a rotor part, the gear reduction means comprising an input gear and an output gear carrier, the valve stem being co-operable with the output gear carrier keyway, the stator part being energizable to drive rotation of the rotor part, the rotor part being operable to drive rotation of the input gear, the input gear being operable to drive rotation of the output gear carrier, the output gear carrier being operable to drive rotation of the valve stem.

7. A control valve according to any one of claims 1 to 4, wherein the control valve is an electrically operated control valve, further comprising a gear reduction device and a housing member, the gear reduction device being provided in the housing member, the lower end of the housing member comprising a reduced diameter portion, the valve body comprising a generally tubular body and a projection extending from a circumferential outer edge of the body, the reduced diameter portion being fixedly connected to the projection.

8. The control valve according to claim 7, further comprising a bearing member fitted over the valve stem, the bearing member being fixedly connected to the diameter-reduced portion or the protruding portion, a flange portion being provided on an outer periphery of the valve stem, the flange portion being located below the bearing member, the flange portion being capable of restraining the valve stem from moving axially upward by abutting against a lower end of the bearing member.