Multistage axial flow labyrinth type high-pressure regulating valve

Abstract

The invention belongs to the field of valves, and particularly relates to a multistage axial flow labyrinth type high-pressure regulating valve which comprises a valve body, a guide sleeve, a valve rod and a guide rod. The guide sleeve is installed in the valve body cavity, a guide hole is formed in the side wall of the guide sleeve, and a first protrusion and a second protrusion are arranged on the inner wall of the guide sleeve. A four-stage valve rod hole is formed in the side wall of the lower part of the valve rod, and the lower part of the valve rod is inserted into the guide sleeve; the lower portion of the guide rod is fixed to the bottom of the valve body, and the upper portion of the guide rod is inserted into the lower portion of the valve rod. The sealing effect when the valve is closed is guaranteed to the maximum extent; the space ratio is greatly reduced; deformation or deviation abrasion caused by impact of left-right wandering of fluid is not prone to occurring; the pressure reduction effect is more obvious, and the good noise reduction effect is achieved.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a multi-stage axial flow labyrinth type high-pressure regulating valve. Background Art

[0002] The existing axial flow high-pressure regulating valves basically have a valve sleeve arranged in the valve body cavity, the bottom end of the valve stem is inserted into the valve sleeve, and some protrusions are arranged on the outer wall of the valve stem and the inner wall of the valve sleeve. These protrusions form several spaces from top to bottom, and the spaces are connected by gaps. When the fluid passes through these spaces in sequence, the pressure is gradually reduced, thereby playing a role in avoiding cavitation. However, this structure requires several spaces to be arranged from top to bottom, so the valve body cavity needs to be made very long, the space utilization rate is low, and the noise reduction effect cannot be significantly improved. Summary of the invention

[0003] The present invention provides a multi-stage axial flow labyrinth type high pressure regulating valve, which can effectively solve the problems in the background technology.

[0004] The present invention provides a multi-stage axial flow labyrinth high-pressure regulating valve, comprising a valve body, a guide sleeve, a valve stem and a guide rod;

[0005] The valve body is provided with an inlet, an outlet and a valve body cavity communicating with the inlet and the outlet;

[0006] The guide sleeve is sleeve-shaped and is installed in the valve body cavity. A guide hole is provided on the side wall of the guide sleeve, and a first protrusion and a second protrusion are provided on the inner wall of the guide sleeve.

[0007] The lower part of the valve stem is hollow, and the side wall of the lower part of the valve stem is provided with four-stage valve stem holes, and the lower part of the valve stem is inserted into the guide sleeve; the first protrusion together with the guide sleeve, the valve stem and the valve body constitute a first cavity; the guide hole communicates with the inlet and the first cavity; the first protrusion and the second protrusion and the guide sleeve and the valve stem therebetween constitute a second cavity;

[0008] The lower part of the guide rod is fixed to the bottom of the valve body, and the upper part of the guide rod is inserted into the lower part of the valve stem; the side wall of the guide rod is provided with a third protrusion and a fourth protrusion; the third protrusion together with the lower part of the valve stem constitutes a third cavity; the third protrusion and the fourth protrusion and the guide rod and the lower part of the valve stem therebetween constitute a fourth cavity;

[0009] When the valve stem is in the first use state, the guide hole and the four-stage valve stem hole enable the inlet, the first cavity, the third cavity, the second cavity, the fourth cavity and the outlet to be connected in sequence;

[0010] When the valve stem is in the second use state, the first protrusion, the second protrusion, the third protrusion and the fourth protrusion block the four-stage valve stem hole, so that the inlet, the first cavity, the third cavity, the second cavity, the fourth cavity and the outlet cannot be connected.

[0011] As a further optimization of the present invention, the valve body includes a main body, a valve cover and a base; the main body is a four-way structure, two of which serve as an inlet and an outlet, and the other two are straightly connected from top to bottom; the valve cover and the base are respectively covered on the upper and lower straightly connected ports; the upper part of the valve stem passes through the valve cover; and the bottom of the guide rod is fixed to the base.

[0012] As a further optimization of the present invention, the valve cover, the base and the body are all connected by bolts, and serrated metal gaskets or metal graphite gaskets are provided at the connections between the valve cover, the base and the body.

[0013] As a further optimization of the present invention, a fifth cavity is provided between the middle portion of the guide sleeve and the valve body, and the fifth cavity is connected to the inlet.

[0014] As a further optimization of the present invention, the portion of the valve body cavity where the inlet and the outlet are connected is provided as a stepped hole; and the bottom end of the guide sleeve is provided with a stepped surface opposite to the stepped hole.

[0015] As a further optimization of the present invention, the first protrusion, the guide sleeve and the valve stem form a first cavity.

[0016] As a further optimization of the present invention, the valve stem hole is composed of a plurality of small holes.

[0017] The multi-stage axial flow labyrinth high-pressure regulating valve provided by the present invention has the following beneficial effects:

[0018] 1. In the first use state of the present invention, the first cavity, the second cavity, the third cavity and the fourth cavity are all blocked, and the four-fold protection maximizes the sealing effect when the valve is closed;

[0019] 2. The first cavity of the present invention partially overlaps with the third cavity, the third cavity partially overlaps with the second cavity, and the second cavity partially overlaps with the fourth cavity, which greatly reduces the space occupation;

[0020] 3. The valve stem of the present invention is subjected to the dual effects of the guide sleeve and the guide rod during the process of moving up and down, and is not easily deformed or worn eccentrically due to the impact of the fluid wandering left and right;

[0021] 4. The valve stem hole of each level of the present invention can be composed of several arranged small holes. The fluid must pass through several arranged small holes to enter from one cavity to another, which increases the resistance of fluid flow, makes the pressure reduction effect more obvious, and also has a very good noise reduction effect.

[0022] Instruction Manual

[0023] Figure 1 is a schematic cross-sectional view of the first state of this embodiment;

[0024] Figure 2is a cross-sectional schematic diagram of the second state of this embodiment;

[0025] Among them, valve body 1, main body 1a, inlet 1a1, outlet 1a2, valve cover 1b, base 1c, valve stem 2, valve stem lower part 2a, first-level valve stem hole 2a1, second-level valve stem hole 2a2, third-level valve stem hole 2a3, fourth-level valve stem hole 2a4, guide sleeve 3, guide hole 3a, first protrusion 3b, second protrusion 3c, guide rod 4, third protrusion 4a, fourth protrusion 4b, first cavity 5a, second cavity 5b, third cavity 5c, fourth cavity 5d, fifth cavity 5e, gasket 6. DETAILED DESCRIPTION

[0026] like Figure 1 , 2 As shown, this embodiment includes a three-way valve body 1, a valve stem 2, a guide sleeve 3 and a guide rod 4.

[0027] The valve body 1 includes a main body 1a, a valve cover 1b and a base 1c. The main body 1a is a four-way structure, in which the left and right ports serve as the inlet 1a1 and the outlet 1a2, and the upper and lower ports are straight through. The valve cover 1b is detachably fixed to the upper port by bolts, and a gasket 6 is also provided on the connecting surface between the valve cover 1b and the main body 1a. The valve cover 1b is detachably fixed to the lower port by bolts, and a gasket 6 is also provided on the connecting surface between the valve cover 1b and the main body 1a. The gasket 6 is preferably a serrated metal gasket or a metal graphite gasket, which has both good pressure bearing capacity and good sealing effect.

[0028] It should be noted that the directional words such as up, down, left, right, and bottom described in this application are all based on the drawings as references, and the directional words are only for a better explanation of this application and are not intended to limit this application.

[0029] The guide sleeve 3 is sleeve-shaped and is installed in the valve body cavity and is located between the upper and lower openings. In this embodiment, the portion of the valve body cavity where the inlet 1a1 and the outlet 1a2 communicate is set as a stepped hole, and the bottom end of the guide sleeve 3 is provided with a stepped surface opposite to the stepped hole. When installing, the stepped surface of the guide sleeve 3 can be clamped in the stepped hole in the valve body cavity. The installation structure of the stepped surface and the stepped hole can have a good sealing effect on the one hand, and can also provide a positioning effect for the installation of the guide sleeve 3 on the other hand.

[0030] In order to facilitate installation, a circle of convex is set on the side wall of the upper end of the guide sleeve 3, and the shape of the upper port corresponds to the convex. During installation, the guide sleeve 3 is inserted downward from the opening of the upper port until the stepped surface fits with the stepped hole, and the convex just touches the upper port. This structure has at least two effects. One is that the contact area between the outer wall of the guide sleeve 3 and the inner wall of the upper port is reduced, which reduces the difficulty of installation. On the other hand, the convex and the stepped hole and the outer wall of the guide sleeve 3 and the inner wall of the valve body cavity between them form a fifth cavity 5e. The fifth cavity 5e is connected to the inlet 1a1. Due to the existence of the fifth cavity 5e, the setting position of the inlet 1a1 is more flexible. For example, the inlet 1a1 can be connected to the upper part of the fifth cavity 5e, or it can be connected to the lower part of the fifth cavity 5e, so the specific position of the inlet 1a1 can be more flexibly selected according to the application scenario. In other embodiments, it is also possible not to set the convex on the guide sleeve 3, but to directly set a groove as the fifth cavity 5e in the middle of the outer wall of the guide sleeve 3 in the valve body cavity.

[0031] The inner wall of the guide sleeve 3 is provided with two circles of protrusions from top to bottom, namely a first protrusion 3b and a second protrusion 3c.

[0032] The upper part of the valve stem passes through the valve cover 1b, and the lower part 2a of the valve stem is hollow, and the lower part 2a of the valve stem is similar to the shape of a bucket. The side wall of the lower part 2a of the valve stem is provided with four valve stem holes from top to bottom, namely, the first-level valve stem hole 2a1, the second-level valve stem hole 2a2, the third-level valve stem hole 2a3 and the fourth-level valve stem hole 2a4. Preferably, the valve stem holes are composed of a plurality of arranged small holes.

[0033] The lower part 2a of the valve stem is inserted into the guide sleeve 3. The shape of the lower part 2a of the valve stem corresponds to the first protrusion 3b and the second protrusion 3c, so that the first protrusion 3b together with the guide sleeve 3, the valve stem 2 and the body 1a can form a first cavity 5a; the first protrusion 3b and the second protrusion 3c and the guide sleeve 3 and the valve stem 2 therebetween can form a second cavity 5b. In fact, in addition to forming the first cavity 5a and the second cavity 5b, the first protrusion 3b and the second protrusion 3c can also reduce the contact area between the outer wall of the lower part 2a of the valve stem and the inner wall of the guide sleeve 3, so as to facilitate the valve stem 2 to slide up and down relative to the guide sleeve 3. In other embodiments, the first cavity 5a can also be formed by only the first protrusion 3b, the guide sleeve 3 and the valve stem 2. Of course, if this structure is adopted, another protrusion that can contact the valve stem 2 should also be provided on the guide sleeve 3.

[0034] In this embodiment, a guide hole 3a is further provided on the side wall of the guide sleeve 3, and the function of the guide hole 3a is to connect the first cavity 5a and the fifth cavity 5e. Under the function of the guide hole 3a, the guide sleeve 3 is installed in the valve body cavity so that the inlet 1a1 of the valve body 1 can be connected with the outlet 1a2 only after passing through the guide hole 3a and the sleeve of the guide sleeve 3 in sequence.

[0035] The bottom of the guide rod 4 is fixed on the base 1c, and the upper part of the guide rod 4 is inserted into the lower part 2a of the valve stem. The side wall of the guide rod 4 is provided with a third protrusion 4a and a fourth protrusion 4b corresponding to the shape of the inner wall of the lower part 2a of the valve stem from top to bottom. The third protrusion 4a together with the upper part of the inner wall of the lower part 2a of the valve stem constitutes a third cavity 5c; the third protrusion 4a and the fourth protrusion 4b and the outer wall of the guide rod 4 and the inner wall of the lower part 2a of the valve stem constitute a fourth cavity 5d. In fact, in addition to forming the third cavity 5c and the fourth cavity 5d, the third protrusion 4a and the fourth protrusion 4b can also reduce the contact area between the guide rod 4 and the valve stem 2, so as to facilitate the valve stem 2 to slide up and down relative to the guide rod 4.

[0036] In this embodiment, the valve stem 2 moves up and down to realize the conversion between two use states.

[0037] In the first use state, that is, the open use state, if Figure 1 As shown, the first-stage valve stem hole 2a1 is connected to the first cavity 5a and the third cavity 5c, the second-stage valve stem hole 2a2 is connected to the third cavity 5c and the second cavity 5b, the third-stage valve stem hole 2a3 is connected to the second cavity 5b and the fourth cavity 5d, and the fourth-stage valve stem hole 2a4 is connected to the fourth cavity 5d and the outlet 1a2. Under the action of the guide hole 3a, the inlet 1a1, the first cavity 5a, the third cavity 5c, the second cavity 5b, the fourth cavity 5d and the outlet 1a2 are connected in sequence to form a passage.

[0038] In the second use state, that is, the closed use state, if Figure 2 As shown, the first protrusion 3b abuts against the first-stage valve stem hole 2a1 to block the first cavity 5a and the third cavity 5c, the third protrusion 4a abuts against the second-stage valve stem hole 2a2 to block the third cavity 5c and the second cavity 5b, the second protrusion 3c abuts against the third-stage valve stem hole 2a3 to block the second cavity 5b and the fourth cavity 5d, and the fourth protrusion 4b abuts against the fourth-stage valve stem hole 2a4 to block the fourth cavity 5d and the outlet 1a2. Finally, the inlet 1a1, the first cavity 5a, the third cavity 5c, the second cavity 5b, the fourth cavity 5d, and the outlet 1a2 cannot be connected.

[0039] In terms of sealing effect, when this embodiment is in the closed state of use, the first cavity 5a, the second cavity 5b, the third cavity 5c and the fourth cavity 5d are all blocked, and the quadruple protection maximizes the sealing effect when the valve is closed.

[0040] In terms of space usage, the first cavity 5a of this embodiment partially overlaps with the third cavity 5c, the third cavity 5c partially overlaps with the second cavity 5b, and the second cavity 5b partially overlaps with the fourth cavity 5d. Compared with the chain-type space adopted by the traditional axial flow regulating valve, this embodiment greatly reduces the space occupation.

[0041] In terms of stability, the valve stem 2 is not easily deformed or worn eccentrically due to the impact of the fluid wandering left and right, under the dual action of the guide sleeve 3 and the guide rod 4 during the process of moving up and down.

[0042] In terms of noise reduction and pressure reduction, the valve stem hole of each level of the present application can be composed of several arranged small holes. The fluid must pass through several arranged small holes from one cavity to another, which increases the resistance of the fluid flow and makes the pressure reduction effect more obvious. Moreover, this structure of several small holes has a very good noise reduction effect while reducing the pressure.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A multi-stage axial flow labyrinth high pressure regulating valve, characterized in that: It includes a valve body, a guide sleeve, a valve stem and a guide rod; The valve body is provided with an inlet, an outlet and a valve body cavity communicating with the inlet and the outlet; The guide sleeve is sleeve-shaped and is installed in the valve body cavity. A guide hole is provided on the side wall of the guide sleeve, and a first protrusion and a second protrusion are provided on the inner wall of the guide sleeve. The lower part of the valve stem is hollow, and the side wall of the lower part of the valve stem is provided with four-stage valve stem holes, and the lower part of the valve stem is inserted into the guide sleeve; the first protrusion together with the guide sleeve, the valve stem and the valve body constitute a first cavity; the guide hole communicates with the inlet and the first cavity; the first protrusion and the second protrusion and the guide sleeve and the valve stem therebetween constitute a second cavity; The lower part of the guide rod is fixed to the bottom of the valve body, and the upper part of the guide rod is inserted into the lower part of the valve stem; the side wall of the guide rod is provided with a third protrusion and a fourth protrusion; the third protrusion together with the lower part of the valve stem constitutes a third cavity; the third protrusion and the fourth protrusion and the guide rod and the lower part of the valve stem therebetween constitute a fourth cavity; When the valve stem is in the first use state, the guide hole and the four-stage valve stem hole enable the inlet, the first cavity, the third cavity, the second cavity, the fourth cavity and the outlet to be connected in sequence; When the valve stem is in the second use state, the first protrusion, the second protrusion, the third protrusion and the fourth protrusion block the four-stage valve stem hole, so that the inlet, the first cavity, the third cavity, the second cavity, the fourth cavity and the outlet cannot be connected.

2. A multi-stage axial flow labyrinth high pressure regulating valve according to claim 1, characterized in that: The valve body includes a main body, a valve cover and a base; the main body is a four-way structure, two of which are used as an inlet and an outlet, and the other two are straight through from top to bottom; the valve cover and the base are respectively covered on the upper and lower straight through ports; the upper part of the valve stem passes through the valve cover; the bottom of the guide rod is fixed on the base.

3. A multi-stage axial flow labyrinth high pressure regulating valve according to claim 2, characterized in that: The valve cover, base and body are all connected by bolts, and the joints of the valve cover, base and body are all provided with serrated metal gaskets or metal graphite gaskets.

4. A multi-stage axial flow labyrinth high pressure regulating valve according to claim 1, characterized in that: A fifth cavity is arranged between the middle part of the guide sleeve and the valve body, and the fifth cavity is communicated with the inlet.

5. The multi-stage axial flow labyrinth high pressure regulating valve according to claim 1, characterized in that: The part of the valve body cavity where the inlet and the outlet are connected is set as a stepped hole; the bottom end of the guide sleeve is provided with a stepped surface opposite to the stepped hole.

6. A multi-stage axial flow labyrinth high pressure regulating valve according to claim 1, characterized in that: The first protrusion, the guide sleeve and the valve stem form a first cavity.

7. The multi-stage axial flow labyrinth high pressure regulating valve according to claim 1, characterized in that: The valve stem hole is composed of several small holes.

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