Two-position three-way valve with sealed sharp edge

Abstract

The utility model discloses a two-position three-way valve with a sealed sharp edge. Comprising a valve shell, a valve seat, a valve sleeve arranged in the valve shell, a valve element which is restrained at a first position by an axial elastic self-recovery part and overcomes the acting force of the elastic self-recovery part under the action of the axial external force to move from the first position to a second position, and a driving device used for applying the axial external force to the valve element. The driving device is arranged on the rear side of the valve element. The valve element of the two-position three-way valve is provided with the first conical surface and the second conical surface, the first conical surface abuts against the wall corner of the front opening of the valve sleeve and seals the second liquid channel only when the valve element is located at the first position, and the second conical surface abuts against the wall corner of the connecting position of the first inlet and outlet and the valve seat cavity only when the valve element is located at the second position. Therefore, a sharp-edge mechanical sealing mode is formed, the bidirectional locking function is achieved, the internal leakage amount is greatly reduced through the sealing mode, and the sealing device can be used for the working condition with the high pressure maintaining requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid control, and in particular relates to a two-position three-way valve with a sharp edge seal. Background Art

[0002] Two-position three-way valves are widely used in various fields such as new energy, engineering machinery, industrial integrated systems, machine tools, metallurgy, chemical industry, aerospace, automobiles, environmental protection, energy conservation, etc. Two-position means that the valve core has two working positions, namely the initial position before the valve core is actuated, and the other working position after the valve core is switched. Three-way means that the valve can realize the channel in the initial position and change to another channel switching in the other position (for example, the three ports ABC, the initial position is AB port, and the other position after the valve is actuated is BC port).

[0003] At present, two-position three-way valves usually use a sliding ring sealing structure to achieve a two-way locking function (switching of working positions). In the sliding ring sealing structure, there is still a certain gap between the mating parts, resulting in a large amount of internal leakage after the switching is completed, and it cannot be used in working conditions with high pressure maintenance requirements. Utility Model Content

[0004] Based on this, in order to solve the above technical problems, a two-position three-way valve with a sharp edge seal is provided.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A two-position three-way valve with a sharp edge seal, comprising:

[0007] Valve housing;

[0008] a valve seat located at the axial front side of the valve housing, the valve seat having a first inlet and outlet and a valve seat cavity connected to the first inlet and outlet at the rear side, a first liquid channel and a radial second inlet and outlet formed on the peripheral wall of the valve seat cavity, the front port of the first liquid channel being located at the front side of the second inlet and outlet, and the second inlet and outlet being connected to the rear port of the first liquid channel;

[0009] A valve sleeve is arranged in the valve housing, the front end of the valve sleeve extends into the valve seat cavity, and the valve sleeve and the valve housing form a third inlet and outlet in a radial direction;

[0010] A valve core is constrained in a first position by an axial elastic self-restoring member, and moves from the first position to a second position under the action of an axial external force by overcoming the action of the elastic self-restoring member. The valve core passes through the valve sleeve, and its rear portion is slidably matched with the valve sleeve in front and back directions. A gap is provided between the middle portion and the valve sleeve, forming a second liquid passage connecting the third inlet and outlet when the valve core is in the second position. The front portion of the valve core is located at the front side of the valve sleeve, and the circumference of the front portion has a first conical surface that abuts against the front wall angle of the valve sleeve to form a seal for the second liquid passage only when the valve core is in the first position, and a second conical surface that abuts against the wall angle at the connection between the first inlet and outlet and the valve seat cavity to form a seal for the first inlet and outlet only when the valve core is in the second position, so that the first inlet and outlet are connected to the second inlet and outlet only through the first liquid passage when the valve core is in the first position, and the second inlet and outlet are connected to the third inlet and outlet only through the second liquid passage when the valve core is in the second position. The second conical surface is located at the front side of the first conical surface, and the front end of the elastic self-restoring member is connected to the rear end of the valve core, and the rear end is fixed to the valve housing;

[0011] A driving device for applying the axial external force to the valve core, wherein the driving device is arranged at the rear side of the valve core.

[0012] The valve core of the two-position three-way valve of the utility model comprises a first conical surface and a second conical surface. The first conical surface abuts against the wall angle of the front opening of the valve sleeve only when the valve core is in the first position to form a seal for the second liquid channel. The second conical surface abuts against the wall angle at the connection between the first inlet and outlet and the valve seat cavity only when the valve core is in the second position to form a seal for the first inlet and outlet, thereby forming a pointed edge mechanical sealing method to realize a two-way locking function. This sealing method greatly reduces the internal leakage and can be used in working conditions with high pressure maintenance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a partial enlarged view of the utility model. DETAILED DESCRIPTION

[0016] The following will illustrate the implementation methods of the utility model in conjunction with the drawings in the specification. It should be noted that the implementation methods involved in this specification are not exhaustive and do not represent the only implementation methods of the utility model. The following corresponding embodiments are only for the purpose of clearly illustrating the utility model content of the utility model patent, and are not intended to limit its implementation methods. For ordinary technicians in this field, different forms of changes and modifications can be made on the basis of the description of this embodiment. All obvious changes or modifications that belong to the technical concept and utility model content of the utility model are also within the scope of protection of the utility model.

[0017] like Figure 1 As shown, an embodiment of the utility model provides a two-position three-way valve with a sharp edge seal, including a valve housing 110 , a valve seat 120 , a valve sleeve 130 , a valve core 140 , an axial elastic self-restoring member 150 and a driving device 160 .

[0018] The valve housing 110 is installed in the pipeline 2 . The pipeline 2 has a first pipe opening 21 on the left side and a second pipe opening 22 and a third pipe opening 23 on the lower side.

[0019] The valve seat 120 is installed at the first pipe opening 21 and is located at the axial front side of the valve housing 110 .

[0020] The valve seat 120 has a first inlet and outlet 121 and a valve seat cavity. The first inlet and outlet 121 is in the front-to-back direction and is concentric with the first pipe opening 21. The valve seat cavity is connected to the first inlet and outlet 121 at the rear side, and the connection between the two forms a right angle wall angle 122, see Figure 2 .

[0021] like Figure 1 and Figure 2 As shown, a first liquid channel and a radial second inlet and outlet 123 are formed on the peripheral wall of the valve seat cavity. The front port 124 of the first liquid channel is located at the front side of the second inlet and outlet 123. The second inlet and outlet 123 is connected with the rear port (not shown in the figure) of the first liquid channel and the second pipe port 22. In this embodiment, the front port 124 is located at the front part of the peripheral wall of the valve seat cavity, and the second inlet and outlet 123 is located in the middle part of the peripheral wall of the valve seat cavity.

[0022] The valve sleeve 130 is concentrically arranged in the valve housing 110 , and its front end extends into the valve seat cavity to a position in front of the second inlet and outlet 123 . The valve sleeve 130 and the valve housing 110 form a third inlet and outlet 170 in radial direction, and the third inlet and outlet 170 is connected to the third pipe opening 23 .

[0023] The front opening of the valve sleeve 130 has a right angle wall corner 131, see Figure 2 .

[0024] like Figure 1As shown, the valve core 140 passes through the valve sleeve 130, and the outer diameter of the rear portion thereof is adapted to the inner diameter of the valve sleeve 130 to form a front-to-back sliding fit with the valve sleeve 130. There is a gap between the middle portion and the valve sleeve 130 to form a second liquid channel 141. The front portion of the valve core 140 is located at the front side of the valve sleeve 130 (i.e., outside the valve sleeve 130 and inside the valve seat cavity), and the circumference of the front portion has a first conical surface 142 and a second conical surface 143. The second conical surface 143 is located at the front side of the first conical surface 142, see Figure 2 .

[0025] The axial elastic self-restoring member 150 can be a spring, a front end of which is connected to the rear of the valve core 140 , and a rear end is fixed to the mounting seat 111 in the rear of the valve housing 110 .

[0026] The valve core 140 has two working positions: a first position and a second position. The valve core 140 is initially constrained in the first position by the axial elastic self-restoring member 150, and moves from the first position to the second position when subjected to an axial external force from the back to the front, overcoming the force of the elastic self-restoring member 150. Figure 1 The state where the valve core 140 is located at the first position is shown.

[0027] Among them, Figure 1 and Figure 2 As shown, the first conical surface 142 abuts against the front wall corner 131 of the valve sleeve 130 to form a seal for the second liquid channel 141 only when the valve core 140 is in the first position, and the second conical surface 143 abuts against the wall corner 122 at the connection between the first inlet and outlet 121 and the valve seat cavity to form a seal for the first inlet and outlet 121 only when the valve core 140 is in the second position. At the same time, the second liquid channel 141 is connected to the third inlet and outlet 170 at least when the valve core 140 is in the second position.

[0028] It can be seen that only when the valve core 140 is in the first position, the second conical surface 143 does not contact the wall corner 122, so that the first inlet and outlet are connected with the second inlet and outlet through the first liquid channel. Only when the valve core 140 is in the second position, the first conical surface 142 does not contact the wall corner 131, so that the second inlet and outlet 123 and the third inlet and outlet 170 are connected with each other through the second liquid channel 141, thereby realizing two-position three-way.

[0029] like Figure 1 As shown, the driving device 160 is used to apply the above-mentioned axial external force to the valve core 140 , and is arranged on the rear side of the valve core 140 .

[0030] In this embodiment, the driving device 160 is an electromagnetic driving device, which includes a magnetic tube 161, a push rod 162, a moving iron 163, a coil 164, a pin seat 165, a pin 166, an end cover 167, a pin head 168 and a manual pin 169.

[0031] The front end of the magnetic tube 161 is inserted into the rear end of the valve housing 110, and a push rod cavity and a moving iron cavity in the front-to-back direction are formed in the magnetic tube 161. The push rod cavity is located at the front side of the moving iron cavity. The push rod 162 is arranged in the push rod cavity, and its front end passes through the magnetic tube 161 and is connected to the rear end of the valve core 140. The moving iron 163 is arranged in the moving iron cavity and touches the rear end of the push rod 162. The coil 164 is arranged outside the magnetic tube 161.

[0032] The front part of the ejector seat 165 is fixed in the moving iron cavity and is located on the rear side of the moving iron 163. The ejector pin 166 passes through the ejector seat 165, and its front end touches the moving iron 163. The end cover 167 covers the outside of the magnetic tube 161 and the ejector seat 165, and a threaded seat 167a is formed therein. The ejector head 168 is threadedly connected to the threaded seat 167a and touches the rear end of the ejector pin 166 on the rear side. The manual ejector rod 169 passes through the end cover 167 from back to front and is connected to the ejector head 168.

[0033] During operation, the coil 164 is energized, and the moving iron 163 moves forward from the initial position under the action of magnetic force, and applies axial external force to the valve core 140 through the push rod 162, so that the valve core 140 moves from the first position to the second position. When the coil 164 is de-energized, the valve core 140 returns to the first position under the action of the elastic self-restoring member 150, and at the same time, the moving iron 163 returns to the initial position, thereby realizing the reversal of the valve.

[0034] In order to improve the switching time of the valve, avoid the impact of high-speed switching, and achieve a stable switching process and fluid stability, the movable iron 163 has an axial eccentric channel 163a, which forms damping during operation and thus improves the switching time.

[0035] In the absence of power, the manual ejector rod 169 can be operated to rotate, causing the ejector head 168 to move forward along the thread. The ejector head 168 drives the moving iron 163 forward through the ejector pin 166, and then applies axial external force to the valve core 140 through the push rod 162, thereby realizing emergency manual reversing. The dual redundant design of the reversing method improves safety.

[0036] As can be seen from the above, the valve core of the two-position three-way valve in the embodiment of the utility model has a first conical surface and a second conical surface. The first conical surface abuts against the front wall corner of the valve sleeve to form a seal for the second liquid channel only when the valve core is in the first position. The second conical surface abuts against the wall corner at the connection between the first inlet and outlet and the valve seat cavity to form a seal for the first inlet and outlet only when the valve core is in the second position, thereby forming a pointed edge mechanical sealing method to achieve a two-way locking function. This sealing method greatly reduces the internal leakage and can be used in working conditions with high pressure maintenance requirements.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A two-position three-way valve with sharp edge sealing, characterized in that: include: Valve housing; a valve seat located at the axial front side of the valve housing, the valve seat having a first inlet and outlet and a valve seat cavity connected to the first inlet and outlet at the rear side, a first liquid channel and a radial second inlet and outlet formed on the peripheral wall of the valve seat cavity, the front port of the first liquid channel being located at the front side of the second inlet and outlet, and the second inlet and outlet being connected to the rear port of the first liquid channel; A valve sleeve is arranged in the valve housing, the front end of the valve sleeve extends into the valve seat cavity, and the valve sleeve and the valve housing form a third inlet and outlet in a radial direction; A valve core is constrained in a first position by an axial elastic self-restoring member, and moves from the first position to a second position under the action of an axial external force by overcoming the action of the elastic self-restoring member. The valve core passes through the valve sleeve, and its rear portion is slidably matched with the valve sleeve in front and back directions. A gap is provided between the middle portion and the valve sleeve, forming a second liquid passage connecting the third inlet and outlet when the valve core is in the second position. The front portion of the valve core is located at the front side of the valve sleeve, and the circumference of the front portion has a first conical surface that abuts against the front wall angle of the valve sleeve to form a seal for the second liquid passage only when the valve core is in the first position, and a second conical surface that abuts against the wall angle at the connection between the first inlet and outlet and the valve seat cavity to form a seal for the first inlet and outlet only when the valve core is in the second position, so that the first inlet and outlet are connected to the second inlet and outlet only through the first liquid passage when the valve core is in the first position, and the second inlet and outlet are connected to the third inlet and outlet only through the second liquid passage when the valve core is in the second position. The second conical surface is located at the front side of the first conical surface, and the front end of the elastic self-restoring member is connected to the rear end of the valve core, and the rear end is fixed to the valve housing; A driving device for applying the axial external force to the valve core, wherein the driving device is arranged at the rear side of the valve core.

2. A two-position three-way valve with a sharp edge seal according to claim 1, characterized in that: The front opening wall angle of the valve sleeve is a right angle, and the wall angle where the first inlet and outlet are connected to the valve seat cavity is a right angle.

3. A two-position three-way valve with a sharp edge seal according to claim 1, characterized in that: The front port of the first liquid channel is located at the front portion of the peripheral wall of the valve seat cavity, and the second inlet and outlet are located at the middle portion of the peripheral wall of the valve seat cavity.

4. A two-position three-way valve with a sharp edge seal according to claim 1, characterized in that: The elastic self-restoring member is a spring.

5. A two-position three-way valve with a sharp edge seal according to claim 1, characterized in that: A mounting seat is provided in the rear portion of the valve housing, and the rear end of the elastic self-restoring member is fixed to the mounting seat.

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