Magnetic transmission type synchronous control valve

Abstract

The utility model provides a magnetic transmission type synchronous control valve which is characterized in that a first piston cavity is formed in a driving shell, and the upper part of a driving piston is in sliding sealing connection with the first piston cavity; the lower portion of the driving piston is located between the body shell and the driving shell, and the driving piston is provided with a driving reset spring. Two second piston cavities are formed in the body shell, each second piston cavity is matched with a plugging piston, and each plugging piston is provided with a reset spring; the bottom of the driving piston is fixedly provided with a magnet which is opposite to the magnetic pole of the driving piston, and the two opposite magnetic poles have the same polarity; the second piston cavity is provided with two air holes, and when the plugging piston is driven to descend, the hole opening, located in the second piston cavity, of all or one of the two air holes can be sealed and plugged through the plugging pad. According to the utility model, the same poles of the magnets repel to transmit driving force, so that the on-off of two gas paths can be controlled at the same time, and when the device is used for the differential pressure gas tightness leak detector, the consistency of the volumes of the two sides of a reference object and a detected object is ensured, and the consistency of isolation actions is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a magnetic drive type synchronous control valve. Background Art

[0002] Generally, two valves are used in the balance valve of the existing differential pressure airtight leak detector to isolate the reference object and the object to be measured (see the national standard GB / T 25752-2010). The disadvantages include: the actions of the two valves cannot be completely consistent, which will lead to too large a pressure difference on both sides of the differential pressure airtight leak detector; difficult processing, high cost, and poor stability. Content of the Utility Model

[0003] In view of the problems existing in the prior art, the utility model provides the following technical solutions:

[0004] The magnetic drive type synchronous control valve includes a relatively fixed body housing and a drive housing. The drive housing forms a first piston chamber, and the orifice of the first piston chamber faces downward towards the upper surface of the body housing. The upper part of the drive piston is slidably and sealingly connected to the first piston chamber; the lower part of the drive piston is located between the body housing and the drive housing, and a drive return spring is clamped between the drive piston and the body housing.

[0005] The upper part of the drive piston and the first piston chamber form a first variable chamber, and the joint is communicated with the first variable chamber.

[0006] The body housing forms at least two sealed second piston chambers. Each second piston chamber is slidably and fittingly provided with a plugging piston, and a return spring is clamped between the plugging piston and the bottom wall of the second piston chamber; a magnet is fixedly installed on the top of each plugging piston, and a magnet with the opposite pole facing is fixedly installed on the bottom of the drive piston, and the two opposite magnets have the same polarity.

[0007] Two air holes communicating the outside with the second piston chamber are respectively opened at the bottom of each second piston chamber, and a plugging pad is fixedly installed at the bottom of each plugging piston. When the plugging piston is driven to descend, the two air holes or one of them located at the orifice of the second piston chamber can be sealed by the plugging pad.

[0008] Furthermore, a first moving gap is left between the body housing and the drive housing, and they are fixed by a guide shaft and the first moving gap is kept unchanged.

[0009] Furthermore, the lower part of the drive piston is located in the first moving gap, and is slidably connected to the guide shaft through a guide hole opened thereon. The drive return spring is sleeved on the guide shaft and its two ends respectively abut against the lower surface of the drive piston and the upper surface of the body housing.

[0010] Furthermore, the bottom end of the guide shaft is fixedly screwed to the screw hole opened on the upper end surface of the body housing through its external thread section.

[0011] Further, the top end of the guiding shaft is embedded in the embedding hole opened on the lower surface of the driving housing, and the fixing screw passes through the driving housing and is screwed into the screwing hole opened at the top end of the guiding shaft.

[0012] Further, a plurality of axially extending ventilation grooves are formed on the circumferential side of the plugging piston.

[0013] Further, one of the two air holes is used for connecting to an air source, and the other is used for connecting to a reference object or an object to be measured.

[0014] The utility model has a simple structure, simple processing and good stability; the driving force is transmitted by the repulsion of the same-sex magnets, and the on-off of two air paths can be controlled simultaneously. When used in a differential pressure airtightness leak detector, it not only ensures the consistency of the volumes on both sides of the reference object and the object to be measured, but also ensures the consistency of the isolation action. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0018] Figure 3 is Figure 2 a partial cross-sectional view taken along line B-B in, where (a) is the open state and (b) is the closed state in the figure.

[0019] Reference numerals in the drawings: 1-valve seat; 2-second O-ring; 3-reset spring; 4-plugging pad; 5-body housing; 6-plugging piston; 7-driving reset spring; 8-guiding shaft; 9-driving piston; 10-driving housing; 11-first O-ring; 12-joint; 13-fixing screw; 14-magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0021] As shown in the figure, the present utility model includes a body housing 5 and a driving housing 10. A first moving gap is left between the body housing 5 and the driving housing 10, and the two are fixed by four guiding shafts 8 and the first moving gap is kept fixed and unchanged;

[0022] Specifically, refer toFigure 3 As shown, the bottom end of the guide shaft 8 is screwed and fixed to the screw hole opened on the upper end surface of the main body housing 5 through its external thread section. The top end of the guide shaft 8 is embedded in the mounting hole opened on the lower surface of the driving housing 10. The fixing screw 13 passes through the driving housing 10 and is screwed to the screw hole opened at the top end of the guide shaft 8, thereby fixing the top end of the guide shaft 8 to the driving housing 10.

[0023] The driving housing 10 forms a first piston chamber. The orifice of the first piston chamber faces downward towards the upper surface of the main body housing 5. The upper part of the driving piston 9 is slidably connected to the first piston chamber, and a sliding sealing connection between the side wall of the first piston chamber and the upper part of the driving piston 9 is achieved through the first O-ring 11.

[0024] The lower part of the driving piston 9 is located in the first moving gap and is slidably connected to the guide shaft 8 through the guiding hole opened thereon. A driving return spring 7 is also sleeved on the guide shaft 8. The two ends of the driving return spring 7 respectively abut against the lower surface of the driving piston 9 and the upper surface of the main body housing 5.

[0025] The top end surface of the upper part of the driving piston 9 faces the bottom wall of the first piston chamber and forms a first variable chamber therewith. The joint 12 is screwed and fixed to the driving housing 10 and is communicated with the first variable chamber. After the joint 12 is connected to the driving pressure, under the action of air pressure, the increase of the first variable chamber drives the whole driving piston 9 to move downward along the guide shaft towards the main body housing 5, and the driving return spring 7 provides a return elastic force to drive the whole driving piston 9 to move upward along the guide shaft away from the main body housing 5.

[0026] A second piston chamber with an orifice facing away from the driving piston 9 is opened in the main body housing 5. A valve seat 1 is fixedly connected to the orifice of each second piston chamber and is sealed through the second O-ring 2, thereby forming two sealed second piston chambers in the main body housing 5. A plugging piston 6 is slidably fitted in each second piston chamber with clearances. The plugging piston 6 can slide up and down in the second piston chamber. To ensure that there is no air pressure hindrance during the sliding up and down, a plurality of axially extending ventilation grooves are opened on the circumferential side of the plugging piston 6. A return spring 3 is clamped between the plugging piston 6 and the bottom wall of the second piston chamber (i.e., the upper end surface of the valve seat 1 located in the chamber). When the elastic force of the return spring 3 is greater than the magnetic repulsive force received by the plugging piston 6, the top wall of the plugging piston 6 is abutted and limited by the top wall of the second piston chamber.

[0027] A magnet 14 is fixedly installed on the top of each plugging piston 6. A magnet facing the magnet on the plugging piston 6 is fixedly installed on the bottom of the driving piston 9. The two magnetic poles of each magnet on the driving piston 9 and the plugging piston 6 are arranged vertically, one on top and the other at the bottom. And the magnetic pole facing downward of the magnet on the driving piston 9 and the magnetic pole facing upward of the corresponding magnet on the plugging piston 6 are of the same polarity. For example Figure 2In the embodiment shown, the magnetic pole of the magnet on the driving piston 9 facing downward and the magnetic pole of the magnet on the corresponding plugging piston 6 facing upward are both N poles.

[0028] At the bottom of each second piston chamber, which is formed by the valve seat 1, there are respectively two air holes connecting the outside with the second piston chamber: one air hole is used to connect to the air source, and the other is used to connect to an object or the object to be measured. At the bottom of each plugging piston 6, there is fixedly installed a plugging pad 4. When the plugging piston 6 is driven to descend, it can seal all or one of the holes of the two air holes located in the second piston chamber through the plugging pad 4. In this embodiment Figure 2 It shows the sealing of the holes of the air holes connecting to the reference object and the object to be measured. Preferably, the air holes connecting to the reference object and the object to be measured protrude from the bottom of the second piston chamber so as to be better sealed by the plugging pad 4.

[0029] Working principle: As shown in Figure 2 and Figure 3 In (a) shown therein, when there is no driving air pressure, the synchronous control valve is in the "open state". Under the action of the return spring 3 and the driving return spring 7, both air paths on both sides of the synchronous control valve are in a connected state, that is, air source → reference object, air source → object to be measured are conducted; when the driving pressure is connected through the joint 12, combined with Figure 3 In (b) shown, under the action of the air pressure, the synchronous control valve becomes the "closed state", the driving piston 9 moves downward, driving the magnet 14 installed on the driving piston 9 to move downward. Relying on the repulsive force between the magnets 14 of the same polarity facing each other on the driving piston 9 and the plugging piston 6, the plugging piston 6 is pushed to move downward against the elastic force of the return spring 3. After the plugging pad 4 fixedly installed on the plugging piston 6 contacts and seals the hole of the air hole opened on the valve seat, the connection between the air source and the reference object and the object to be measured is cut off at the same time; when the driving air pressure is emptied, under the action of the return spring 3 and the driving return spring 7, the air paths on both sides of the synchronous control valve return to the connected state.

[0030] This solution uses a set of driving systems to control the on-off of two air paths, ensuring that the volumes, action times, etc. of the two air paths are exactly the same, solving the problem of poor action consistency when using two balance valves in a differential pressure airtight leak detector, ensuring the symmetry of both sides of the reference object and the object to be measured in the differential pressure airtight leak detector, and improving the stability and accuracy of the test;

[0031] When needed, the same principle can also be used, and one driving device can be used to control the on-off of more air paths.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Magnetic drive type synchronous control valve, characterized in that: The invention comprises a relatively fixed main body shell and a driving shell, wherein the driving shell forms a first piston cavity, the cavity opening of the first piston cavity is downwardly directed toward the upper surface of the main body shell, and the upper part of the driving piston is slidably and sealedly connected with the first piston cavity; the lower part of the driving piston is located between the main body shell and the driving shell, and a driving return spring is sandwiched between the driving piston and the main body shell; The upper part of the driving piston and the first piston chamber form a first variable chamber, and the joint is connected to the first variable chamber; The main body shell forms at least two sealed second piston chambers, each gap in each second piston chamber is slidably matched with a blocking piston, and a return spring is sandwiched between the blocking piston and the bottom wall of the second piston chamber; a magnet is fixedly installed on the top of each blocking piston, and a magnet with a magnetic pole opposite to the driving piston is fixedly installed on the bottom of the driving piston, and the two opposite magnetic poles are of the same polarity; The bottom of each second piston cavity is provided with two air holes connecting the outside world and the second piston cavity. A sealing pad is fixedly installed at the bottom of each blocking piston. When the blocking piston is driven down, the blocking pad can seal and block all or one of the two air holes located in the second piston cavity.

2. The magnetic transmission type synchronous control valve according to claim 1, characterized in that: A first movable gap is left between the main body shell and the driving shell, and they are fixed by a guide shaft to keep the first movable gap fixed.

3. The magnetic transmission type synchronous control valve according to claim 2, characterized in that: The lower part of the driving piston is located in the first movable gap and is slidably connected to the guide shaft through the guide hole provided therein. The driving return spring is sleeved on the guide shaft and its two ends respectively abut against the lower surface of the driving piston and the upper surface of the main body shell.

4. The magnetic transmission type synchronous control valve according to claim 3, characterized in that: The bottom end of the guide shaft is screwed and fixed with a screw hole provided on the upper end surface of the main body shell through its external thread section.

5. The magnetic transmission type synchronous control valve according to claim 3, characterized in that: The top end of the guide shaft is embedded in the embedding hole opened on the lower surface of the driving shell, and the fixing screw passes through the driving shell and is screwed to the screw hole opened on the top end of the guide shaft.

6. The magnetic transmission type synchronous control valve according to claim 1, characterized in that: A plurality of axially extending ventilation grooves are provided on the peripheral side of the blocking piston.

7. The magnetic transmission type synchronous control valve according to claim 1, characterized in that: One of the two air holes is used to connect to the air source, and the other is used to connect to the reference object or the object to be measured.

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