CN215172564U - Ultrahigh pressure reducing valve - Google Patents

Abstract

The utility model discloses an ultrahigh pressure reducing valve, which comprises a valve body, wherein an upper valve sleeve, a middle valve sleeve, a lower valve sleeve, a valve seat, a filter element, a slide valve, a reset spring and a pressure regulating device are arranged in the valve body, and the central lines of all parts are on the same axis; because the ultrahigh pressure medium enters the annular groove at the matching part of the slide valve and the corresponding hole, the radial unbalanced force to the slide valve is eliminated, the friction force when the slide valve moves is greatly reduced, TiN or CrN is coated on the surface of the slide valve, the friction coefficient when the slide valve moves is reduced, the ejector rod at the upper section of the slide valve is connected with the stainless steel membrane in a non-consolidation way, and the additional friction force caused by improper connection to the movement of the slide valve is eliminated; the utility model structurally ensures the concentricity of the taper hole and the taper surface of the valve, and the hardness difference of the materials of the taper hole and the taper surface is larger, so that the contact surface is more attached under the ultrahigh pressure, and the sealing is more reliable; the high-precision filter element is arranged at the inlet, so that larger particle impurities are prevented from entering the valve to influence the movement of the slide valve and the sealing of the valve port.

Description

Ultrahigh pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to superhigh pressure relief pressure valve.

Background

The pressure reducing valve is a valve which reduces high-pressure medium in front of the valve to low pressure required by the rear of the valve, and when the pressure or flow of an inlet and an outlet fluctuates, the pressure reducing valve automatically adjusts by utilizing the self structure to ensure that the output pressure is basically kept unchanged. However, this "substantially constant" has an important condition that the friction force generated when the slide valve is lifted is negligible with respect to the force pushing it to lift, and for the conventional pressure reducing method of medium and low pressure, the friction force generated when the slide valve is moved is negligible because the radial unbalance force generated to the slide valve by the medium in the clearance between the slide valve and the corresponding mating hole is not large, especially for the pressure reducing valve using the lubricating medium. However, for an ultrahigh pressure reducing valve, such as a pressure reducing valve used for a hydrogen fuel cell, the pressure has reached 70MPa at present, and because the radial unbalanced force applied to the slide valve is large, the friction generated during the movement of the slide valve will block the movement of the slide valve, causing slow movement and even locking, especially for the slide valve using a non-lubricating medium or a slide valve with an O-ring on the outer diameter. In order to reduce the radial unbalance force, the currently generally adopted method is to open a plurality of pressure equalizing grooves on the surface of the slide valve, but the effect is not obvious under the ultrahigh pressure working condition, and the radial unbalance force is related to the form and position tolerance (such as taper, out-of-roundness, out-of-cylindricity and the like), the fit clearance, the installation eccentricity and other factors of the slide valve and corresponding fit holes; in addition, the common pressure reducing valve adopts soft sealing, and for ultrahigh pressure, the sealing needs to adopt hard sealing which has the advantages of pressure resistance, abrasion resistance, high temperature resistance and long service life, but the problem of sealing reliability needs to be solved. The pressure reducing valve is designed for solving the technical defects of the common pressure reducing valve.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve prior art's superhigh pressure relief pressure valve under the very big operating mode of radial unbalance force, the frictional force that produces during the sliding valve motion will hinder the motion of sliding valve, causes the action slow, blocks the sealed problem of dead problem and valve port even, provides a superhigh pressure relief pressure valve, can effectively solve above-mentioned problem.

The utility model adopts the specific technical proposal that the ultrahigh pressure reducing valve comprises a valve body, wherein an upper valve sleeve, a middle valve sleeve, a lower valve sleeve, a filter element, a slide valve, a reset spring and an output pressure adjusting device are arranged in the valve body, the central lines of the above-mentioned components are on the same axial line, the plunger piston of lower segment of slide valve is slide-fitted in the small hole of lower valve sleeve, its surface is coated with TiN or CrN, the ball head of the upper-section ejector rod is tightly propped against the lower end face of the connecting screw under the thrust of a return spring, a longitudinal blind hole is formed in the center of the lower end face, four upper radial holes which are uniformly distributed and communicated with the longitudinal blind holes are formed in the upper section of the plunger, four lower radial holes which are uniformly distributed and communicated with the longitudinal blind holes are formed in the middle-lower section of the plunger, and an annular groove I is formed in an outer opening of each lower radial hole; the material of the slide valve is stainless steel, and the material of the valve seat is copper alloy, aluminum alloy or resin with the hardness lower than that of the slide valve; because the ultrahigh pressure medium enters the annular groove at the matching part of the slide valve and the corresponding hole, the radial unbalanced force to the slide valve is eliminated, and the friction force during the motion of the slide valve is greatly reduced; the ejector rod at the upper section of the slide valve is connected with the diaphragm in a non-fixed mode, so that additional friction force caused by improper connection to the motion of the slide valve is eliminated; due to the reasonable design of the structure, the concentricity of the taper hole of the valve seat and the taper surface of the slide valve is ensured, and the hardness difference of the materials of the valve seat and the taper surface of the slide valve is larger, so that under ultrahigh pressure, the contact surface is more attached and the sealing is more reliable due to the deformation of the softer material; the inlet is provided with a high-precision filter element, so that larger particle impurities are prevented from entering the valve to influence the movement of the slide valve and the sealing of the valve port.

Preferably, the valve body is a stepped cylinder with a large upper diameter and a small lower diameter, the bottom of the lower cylinder is provided with a bottom wall, a circular convex ring is arranged below the bottom wall, the center of the convex ring is provided with an inlet and a through hole I, a filter element is arranged above the inlet, and the filter element is positioned by a retainer ring; one side of the upper cylinder is provided with a circular convex ring, the center of the convex ring is provided with an outlet and a through hole II, the upper end of an inner hole of the upper cylinder is provided with an internal thread, and the lower end of the inner hole of the upper cylinder is provided with a groove provided with an O-shaped sealing ring II; the cylinder at the lower part of the lower valve sleeve is in transition fit with the inner hole of the lower cylinder of the valve body, the lower end surface of the upper frustum is abutted against the upper end surface of the corresponding hole, the center of the upper frustum is provided with a stepped hole with a large diameter at the top and a small diameter at the bottom, and the bottom wall is provided with a third through hole; the outer diameter of the middle valve sleeve is matched with the inner hole of the upper cylinder of the valve body in a sliding manner, an upper O-shaped sealing ring I and a lower O-shaped sealing ring II are arranged, a pit is formed in the upper end of the middle valve sleeve, a taper hole is formed in the lower end of the middle valve sleeve, a stepped hole is formed above the taper hole, and the taper of the taper hole is the same as that of a frustum on the upper portion of the lower valve sleeve; a valve seat is tightly matched in a large hole of the stepped hole, a through hole IV in the center of the stepped hole is communicated with the upper concave pit, an annular channel is formed between the through hole IV and the ejector rod of the upper section of the slide valve, four uniformly distributed radial through holes are arranged on the wall in the center of the through hole IV, an annular groove II is arranged at the outer opening of the radial through hole, and the annular groove II is communicated with the through hole II; the external thread of the middle section of the upper valve sleeve is screwed with the internal thread at the upper end of the inner hole of the upper cylinder of the valve body, the cylinder at the lower end is matched with the inner hole of the upper cylinder of the valve body in a sliding way, and the top cover is provided with a screw hole; the diaphragm is arranged between the upper valve sleeve and the middle valve sleeve, and the valve body, the lower valve sleeve, the middle valve sleeve, the diaphragm and the upper valve sleeve can be pressed tightly by screwing the upper valve sleeve.

Preferably, the output pressure adjusting device is arranged in the inner cavity of the upper valve sleeve and consists of an adjusting screw, a first nut, an upper spring seat, a spring, a lower spring seat, a diaphragm, a sealing gasket, a connecting screw and a second nut, and the central lines of all parts are on the same axis. The adjusting screw is screwed in the screw hole of the top cover of the upper valve sleeve, the adjusting screw is rotated to adjust the compression degree of the spring, the output pressure can be adjusted, and the valve is locked by the first nut after being adjusted.

The utility model has the advantages that: the ultrahigh pressure reducing valve of the utility model eliminates the radial unbalanced force to the slide valve and greatly reduces the friction force when the slide valve moves because the ultrahigh pressure medium enters the annular groove at the matching part of the slide valve and the corresponding hole; TiN or CrN is coated on the surface of the slide valve, so that the friction coefficient of the slide valve during movement is reduced; the ejector rod and the diaphragm of the upper section of the sliding valve are connected in a non-consolidation mode, additional friction force caused by improper connection to the movement of the sliding valve is eliminated, and the problems that the friction force generated under the ultrahigh pressure working condition can block the movement of the sliding valve, so that the sliding valve is slow in action and even blocked are solved. In addition, due to the reasonable design on the structure, the concentricity of the taper hole of the valve seat and the taper surface of the slide valve is ensured, and the hardness difference of the materials of the taper hole and the taper surface of the slide valve is larger, so that the contact surface is more attached due to the deformation of a softer material under ultrahigh pressure, and the sealing problem of the valve port is solved.

Drawings

Fig. 1 is a structural sectional view of the ultrahigh pressure reducing valve of the present invention.

In the figure: 1. the valve comprises an adjusting screw, 2, a first nut, 3, an upper spring seat, 4, an upper valve sleeve, 5, a spring, 6, a connecting screw, 7, a second nut, 8, a lower spring seat, 9, a diaphragm, 10, a first O-shaped sealing ring, 11, a sealing gasket, 12, a second O-shaped sealing ring, 13, a middle valve sleeve, 14, a valve seat, 15, a filter element, 16, a reset spring, 17, a sliding valve, 18, a lower valve sleeve, 19, a valve body, an inlet, an outlet, a2, a valve port of a pressure reducing valve, a.

Detailed Description

The following provides a further description of the embodiments of the present invention with reference to the accompanying drawings.

Example 1

The utility model discloses superhigh pressure relief valve is as shown in figure 1, and superhigh pressure relief valve comprises spare parts such as valve body 19, upper valve cover 4, well valve cover 13, lower valve cover 18, slide valve 17, disk seat 14, output pressure adjusting device, filter core 15 and reset spring 16, and the central line of each spare part is on same axis. The valve body 19 is provided with a stepped cylinder with a large upper part and a small lower part, the lower cylinder is provided with a bottom wall, a circular convex ring is arranged below the bottom wall, the center of the convex ring is provided with an inlet A1 and a through hole A, a filter element 15 is arranged above the inlet A1 and is positioned by a retainer ring, so that impurities can not enter the valve to influence the movement of the slide valve 17 and the sealing of a valve port V of the pressure reducing valve; one side of the upper cylinder is provided with a circular convex ring, and the center of the convex ring is provided with an outlet A2 and a through hole two b; the upper end of the inner hole is turned with an internal thread, and the lower end is turned with a groove provided with a second O-shaped sealing ring 12. The cylinder at the lower part of the lower valve sleeve 18 is in transition fit with the inner hole of the lower cylinder of the valve body 19. The upper part is a frustum, the lower end surface of the frustum abuts against the upper end surface of the corresponding hole, the center of the frustum is provided with a stepped hole with a larger diameter at the top and a smaller diameter at the bottom, and the bottom wall is provided with a through hole III c. The outer diameter of the middle valve sleeve 13 is matched with an inner hole in an upper cylinder of the valve body 19 in a sliding mode, an O-shaped sealing ring I10 and an O-shaped sealing ring II 12 are arranged, a concave pit is formed in the upper end of the middle valve sleeve, a conical hole is formed in the lower end of the middle valve sleeve, the conical degree of the conical hole is the same as that of a frustum at the upper portion of the lower valve sleeve 18, a stepped hole is formed above the conical hole, a valve seat 14 is tightly arranged in the large hole, a central through hole four d is communicated with the upper concave pit and the lower concave pit, four uniformly distributed radial through holes e are drilled in the central wall of the through hole four d, and an annular groove II f is formed in the outer diameter of the outer opening of the radial through hole e in a turning mode and communicated with a through hole II b; the lower end face of the valve seat 14 has a tapered bore. The external thread of the middle section of the upper valve sleeve 4 is screwed with the internal thread of the upper end of the inner hole of the upper cylinder of the valve body 19, the external diameter of the lower short cylinder is matched with the inner hole of the upper cylinder of the valve body 19 in a sliding way, two parallel planes (not shown in the figure) are arranged on two sides of the upper small cylinder for screwing the upper valve sleeve 4 by a spanner, and the center of the top cover is provided with a screw hole; the diaphragm 9 (made of 316L stainless steel) is arranged between the upper valve sleeve 4 and the middle valve sleeve 13, and the lower valve sleeve 18, the middle valve sleeve 13 and the diaphragm 9 can be tightly pressed on the upper end surface of the lower cylinder inner hole of the valve body 19 by screwing the upper valve sleeve 4, and the diaphragm 9 is tightly pressed; the output pressure adjusting device is arranged in an inner cavity of the upper valve sleeve 4 and comprises an adjusting screw 1, a nut I2, an upper spring seat 3, a spring 5, a lower spring seat 8, a diaphragm 9, a connecting screw 6, a sealing gasket 11, a nut II 7 and the like, the central line of each part is consistent with the central line of the valve body 19, and the adjusting screw 1 is screwed in a screw hole in the top cover of the upper valve sleeve 4 and used for adjusting the compression degree of the spring 5; the plunger piston of the lower section of the slide valve 17 is matched in the small hole of the lower valve bush 18 in a sliding way, the taper angle of the frustum of the middle section is the same as the taper angle of the taper hole below the valve seat 14, the two taper holes form a valve port V of the pressure reducing valve, the frustum above the lower valve bush 18 is tightly fit with the taper hole below the middle valve bush 13, so that the two taper surfaces of the valve port V of the pressure reducing valve can be completely fit, the ball head of the ejector rod of the upper section is tightly pressed against the lower end surface of the connecting screw 6 under the thrust of the reset spring 16, the slide valve 17 is not connected with the diaphragm 9 and the like into a whole, the additional friction force brought to the motion of the slide valve 17 due to improper connection or installation is eliminated, an annular channel g is formed between the outer diameter of the ejector rod and the through hole four d, the center of the lower end surface of the slide valve 17 is provided with a longitudinal blind hole h, the upper section of the plunger piston is provided with 4 uniformly distributed upper radial holes m which are communicated with each other hole so as to introduce high-pressure medium into the front cavity of the valve port V of the pressure reducing valve, the middle lower section of the plunger piston is provided with 4 uniformly distributed lower radial holes j, the outer opening of the lower radial hole j is turned with a wider annular groove I k, so that the annular groove I k is communicated with the longitudinal blind hole h to guide high-pressure medium to the matching clearance between the plunger and the corresponding hole, the outer diameter of the plunger and the central line of the inner diameter of the annular groove I k are on the same straight line, therefore, the radial unbalanced force borne by the sliding valve 17 is eliminated, and in order to further reduce the friction coefficient, the contact part of the surface of the plunger and the corresponding hole is coated with TiN or CrN.

In order to ensure the sealing performance when the valve port V of the pressure reducing valve is closed, in addition to ensuring the concentricity of the tapered hole of the valve seat 14 and the tapered surface of the frustum at the middle section of the sliding valve 17, the tapered surfaces of the valve seat and the sliding valve are also subjected to matched grinding, the surface roughness is less than or equal to 0.1 mu m, one of the two tapered surfaces is made of a softer material, for example, the material of the sliding valve 17 is stainless steel 316L, and the material of the valve seat 14 is copper alloy or aluminum alloy or synthetic resin (for example, polyimide resin or Teflon), so that under high pressure, the combined surface is more attached due to the deformation of the softer material.

The working principle of the pressure reducing valve is as follows: when the rear stop valve of the valve is closed and medium supply is stopped, the pressure of an outlet cavity of a valve port V of the pressure reducing valve, namely the lower cavity of a diaphragm 9, is increased, the diaphragm 9 overcomes the pressure rise of a spring 5, a slide valve 17 is synchronously raised under the pushing of a return spring 16 until the valve port V of the pressure reducing valve is closed, and after the valve port V of the pressure reducing valve is closed, the pressure of the outlet cavity is not increased any more and is kept at low pressure equivalent to the set pressure all the time; when the rear stop valve of the valve is opened to provide a medium, the pressure of the lower cavity of the diaphragm 9 is reduced, under the pushing of the spring 5, the jacking force of the reset spring 16 is overcome, the slide valve 17 moves downwards, the pressure of the lower cavity of the diaphragm 9 is gradually increased along with the gradual opening of the valve port V of the pressure reducing valve, when the pressure is balanced with the set pressure of the spring 5, the opening degree of the valve port V of the pressure reducing valve is certain, the pressure output of the pressure reducing valve is certain, therefore, the output pressure can be adjusted by adjusting the tightness degree of the spring 5 through the screw 1, and the pressure is locked by the nut I2 after being adjusted. Once the output pressure is set, if the input pressure, the output pressure or the flow rate changes, the pressure reducing valve can automatically adjust by utilizing the self-structure, so that the output pressure is basically kept unchanged. If the input pressure is reduced (or increased), the output pressure is necessarily reduced (or increased) at the moment of reduction (or increase), the slide valve 17 moves downwards (or upwards) under the pushing of the spring 5, the opening degree of a valve port V of the pressure reducing valve is increased (or reduced), the throttling pressure reduction effect is reduced (or increased), and the output pressure is increased (or reduced) to the original set pressure; if the flow is increased (or decreased), the flow rate passing through the valve port V of the pressure reducing valve is also increased (or decreased), the pressure loss is also increased (or decreased), and the output pressure is reduced (or increased), so that the slide valve 17 moves downwards (or rises) under the push of the spring 5 (or the return spring 16), the opening degree of the valve port V of the pressure reducing valve is increased (or reduced), the throttling and pressure reducing effects are reduced (or increased), and the output pressure is increased (or reduced) to the original set value.

In addition to the above embodiments, the technical features or technical data of the present invention can be selected and combined again within the scope disclosed in the claims and the specification of the present invention to constitute a new embodiment, and those embodiments not described in detail in the present invention can be easily implemented by those skilled in the art without creative efforts, so that those embodiments not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.

Claims (3)

1. An ultrahigh-pressure reducing valve, comprising a valve body (19), characterized in that: an upper valve sleeve (4), a middle valve sleeve (13), a lower valve sleeve (18), a filter element (15), a slide valve (17), a return spring (16) and an output pressure adjusting device are arranged in the valve body (19), and the central lines of the upper valve sleeve (4), the middle valve sleeve (13), the lower valve sleeve (18), the filter element (15), the slide valve (17), the return spring (16) and the output pressure adjusting device are on the same axis; a plunger of the lower section of the sliding valve (17) is in sliding fit in a small hole of the lower valve sleeve (18), the surface of the plunger is coated with TiN or CrN, the taper angle of a middle section frustum is the same as the taper angle of a taper hole below the valve seat (14), the two taper holes form a valve port (V) of the pressure reducing valve, a ball head of an upper section ejector rod is tightly propped against the lower end face of the connecting screw (6) under the thrust of a return spring (16), a longitudinal blind hole (h) is formed in the center of the lower end face of the sliding valve (17), four upper radial holes (m) which are uniformly distributed and communicated with the longitudinal blind hole (h) are formed in the upper section of the plunger, four lower radial holes (j) which are uniformly distributed and communicated with the longitudinal blind hole (h) are formed in the middle and lower section of the plunger, and an annular groove I (k) is formed in an outer opening of the lower radial hole (j); the material of the slide valve (17) is stainless steel, and the material of the valve seat (14) is copper alloy, aluminum alloy or resin having hardness lower than that of the slide valve.

2. The ultra-high pressure relief valve of claim 1, wherein: the valve body (19) is a stepped cylinder with the diameter being large at the top and small at the bottom, a bottom wall is arranged at the bottom of the lower cylinder, a circular outer convex ring is arranged below the bottom wall, an inlet (A1) and a through hole I (a) are arranged in the center of the outer convex ring, a filter element (15) is arranged above the inlet (A1) and is positioned by a check ring, the circular outer convex ring is arranged at one side of the upper cylinder, an outlet (A2) and a through hole II (b) are arranged in the center of the outer convex ring, internal threads are arranged at the upper end of an inner hole of the upper cylinder, and a groove for arranging an O-shaped sealing ring II (12) is arranged at the lower end of the inner hole of the upper cylinder; the cylinder at the lower part of the lower valve sleeve (18) is in transition fit with the inner hole of the lower cylinder of the valve body (19), the lower end surface of the upper frustum is abutted against the upper end surface of the corresponding hole, the center of the upper frustum is provided with a stepped hole with a diameter which is large at the top and small at the bottom, and the bottom wall is provided with a through hole III (c); the outer diameter of the middle valve sleeve (13) is matched with the inner hole of the upper cylinder of the valve body (19) in a sliding manner, an upper O-shaped sealing ring I (10) and a lower O-shaped sealing ring II (12) are arranged, a concave pit is formed in the upper end of the middle valve sleeve, a taper hole is formed in the lower end of the middle valve sleeve, and the taper of the taper hole is the same as that of a frustum at the upper part of the lower valve sleeve (18); a stepped hole is arranged above the conical hole, a valve seat (14) is tightly matched in a large hole in the stepped hole, a small hole in the stepped hole, namely a through hole IV (d), is communicated with an upper pit, an annular channel (g) is formed between the through hole IV (d) and an ejector rod at the upper section of the slide valve (17), four uniformly distributed radial through holes (e) are arranged on the wall of the center of the through hole IV (d), an annular groove II (f) is arranged at the outer opening of the radial through hole (e), and the annular groove II (f) is communicated with the through hole II (b); the external thread of the middle section of the upper valve sleeve (4) is screwed with the internal thread at the upper end of the inner hole of the upper cylinder of the valve body (19), the cylinder at the lower end is matched with the inner hole of the upper cylinder of the valve body (19) in a sliding way, and a screw hole is arranged in the top cover; the diaphragm (9) is arranged between the upper valve sleeve (4) and the middle valve sleeve (13), and the upper valve sleeve (4) is screwed, so that the valve body (19), the lower valve sleeve (18), the middle valve sleeve (13), the diaphragm (9) and the upper valve sleeve (4) can be mutually pressed.

3. The ultra-high pressure reducing valve according to claim 1 or 2, characterized in that: the output pressure adjusting device is arranged in an inner cavity of the upper valve sleeve (4), and consists of an adjusting screw (1), a nut I (2), an upper spring seat (3), a spring (5), a lower spring seat (8), a diaphragm (9), a sealing gasket (11), a connecting screw (6) and a nut II (7), the central lines of all parts are on the same axis, the adjusting screw (1) is screwed in a screw hole in the top cover of the upper valve sleeve (4), the compression degree of the adjusting screw (1) for adjusting the spring (5) is rotated, the size of the output pressure can be adjusted, and the output pressure is locked by the nut I (2) after adjustment.

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