Safety air escape valve for steam cleaning machine

Abstract

The utility model discloses a safety air escape valve for a steam cleaning machine, which is characterized by comprising a valve bonnet (1), a valve rod (2) and a valve rod (3), the valve seat (2) is cylindrical, the upper part of the valve seat (2) extends into the accommodating groove (11), and the lower part of the valve seat (2) is connected with a steam generation pot of the steam cleaning machine; the transmission cap (3) can be installed in the containing groove (11) in an axial sliding mode, the transmission cap (3) and the valve bonnet (1) are limited in the circumferential direction, and under the state that the transmission cap (3) covers the top of the valve seat (2), the transmission cap (3) and the valve seat (2) are limited in the circumferential direction; the first elastic piece (4) acts between the transmission cap (3) and the valve bonnet (1); the valve element assembly (5) can be installed in the valve seat (2) in an axial sliding mode and is provided with an ejector rod (521) extending in the axial direction, and the ejector rod (521) is supported at the bottom of the transmission cap (3). Compared with the prior art, the safety air escape valve for the steam cleaning machine is simple in structure and high in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety air release valve for a steam cleaning machine. Background Art

[0002] A steam cleaner is a cleaning device. Its basic structure is a steam generator inside a shell. The steam generator is connected to a steam pipe. At the end of the steam pipe is a steam jet gun. Steam is ejected through the steam jet gun. The steam jet gun is connected to different cleaning brushes to achieve cleaning.

[0003] In order to ensure safety, it is necessary to install a safety relief valve on the steam generator. For details, please refer to the Chinese patent "Self-locking safety valve for portable steam cleaning machine" with patent application number CN200420083652.8.

[0004] However, the existing safety valve has a complex structure and is not reliable enough. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a safety air release valve for a steam cleaning machine with a simple structure and high reliability in view of the current status of the prior art.

[0006] The utility model solves the above technical problems by adopting the following technical solution: a safety air release valve for a steam cleaning machine, characterized in that it comprises:

[0007] The valve cap has a receiving groove with an opening facing downward and extending in the axial direction;

[0008] The valve seat is cylindrical and fixed relative to the valve cap, with the upper portion extending into the accommodating groove and the lower portion being used to connect with the steam generating pot of the steam cleaning machine;

[0009] A transmission cap is axially slidably mounted in the receiving groove and is located above the valve seat. The transmission cap and the valve cap are circumferentially limited. When the transmission cap cover is arranged on the top of the valve seat, the transmission cap and the valve seat are circumferentially limited.

[0010] a first elastic member, acting between the transmission cap and the valve cap, so that the transmission cap always has a tendency to move downward; and

[0011] A valve core assembly is axially slidably mounted in the valve seat, and has an axially extending push rod, which is exposed from the valve seat and supported on the bottom of the transmission cap;

[0012] When the air intake pressure of the valve seat is less than the first preset pressure, the transmission cap moves downward under the elastic force of the first elastic member and covers the top of the valve seat, so that the transmission cap and the valve seat maintain circumferential limit;

[0013] When the air intake pressure of the valve seat reaches a first preset pressure, the push rod drives the transmission cap to move upward and separate from the valve seat under the action of air pressure, so that the transmission cap and the valve seat are released from circumferential limitation.

[0014] In order to realize the pressure relief protection function under high pressure, a first steam exhaust hole communicating with the inner cavity of the valve seat is opened on the peripheral wall of the valve seat;

[0015] The valve core assembly includes

[0016] A first valve core is axially slidably mounted in the valve seat and has an axially extending sliding cavity therein;

[0017] A second valve core is axially slidably mounted in the sliding cavity, and the push rod is protruding from the top of the second valve core and extending out of the sliding cavity; and

[0018] A second elastic member acts between the first valve core and the valve seat so that the first valve core always has a tendency to move downward;

[0019] When the air intake pressure of the valve seat is less than the second preset pressure, the first valve core moves downward under the elastic force of the second elastic member to disconnect the communication between the first exhaust hole and the lower part of the inner cavity of the valve seat;

[0020] When the air intake pressure of the valve seat reaches a second preset pressure, the first valve core moves upward under the action of air pressure to connect the first steam exhaust hole with the lower part of the inner cavity of the valve seat;

[0021] The second preset pressure is greater than the first preset pressure.

[0022] In order to limit the limit position of the lifting of the first valve core, an annular protrusion is convexly provided on the inner peripheral wall of the middle part of the valve seat, a limit cover is installed on the top of the inner cavity of the valve seat, and a sealing seat is convexly provided on the outer peripheral wall of the bottom of the first valve core;

[0023] When the air intake pressure of the valve seat is less than a second preset pressure, the sealing seat abuts against the annular protrusion;

[0024] When the air intake pressure of the valve seat reaches a second preset pressure, the top surface of the first valve core abuts against the limit cover.

[0025] In order to prevent steam from leaking through the gap, a first sealing ring is installed at the bottom of the sealing seat, and when the air inlet pressure of the valve seat is less than the second preset pressure, the first sealing ring seals with the annular protrusion;

[0026] A second sealing ring is installed on the periphery of the second valve core and is sealingly matched with the inner peripheral wall of the sliding chamber.

[0027] In order to facilitate the installation of the second elastic member, the second elastic member is a compression spring installed in the valve seat. The compression spring is sleeved on the outer periphery of the first valve core, and the two ends of the compression spring are respectively abutted against the sealing seat and the limit cover.

[0028] In order to limit the extreme position of the lifting of the second valve core, the bottom end of the sliding cavity has an opening;

[0029] When the air intake pressure of the valve seat is less than the first preset pressure, the second valve core abuts against the annular protrusion;

[0030] When the air intake pressure of the valve seat reaches a first preset pressure, the second valve core abuts against the top surface of the sliding chamber.

[0031] In order to facilitate the installation of the first elastic member, an installation groove is opened on the top surface of the transmission cap. The first elastic member is a compression spring, which is installed in the accommodating groove. The lower part of the compression spring is accommodated in the installation groove, and the two ends of the compression spring respectively abut against the bottom surface inside the installation groove and the top surface inside the accommodating groove.

[0032] In order to achieve circumferential limitation between the transmission bonnet, the valve bonnet and the valve seat, the outer circumferential wall and the inner circumferential wall of the transmission bonnet are both regular polygons, the inner circumferential wall of the accommodating groove is a regular polygon matching the outer circumferential wall of the transmission bonnet, and the outer circumferential wall of the upper part of the valve seat is a regular polygon matching the inner circumferential wall of the transmission bonnet.

[0033] In order to facilitate the fixation of the valve seat on the valve bonnet, a limiting plate is installed at the bottom of the valve bonnet, and a limiting flange is protruded on the outer peripheral wall of the middle part of the valve seat. The limiting flange is clamped between the valve bonnet and the limiting plate.

[0034] In order to facilitate user operation, the outer peripheral wall of the valve cap is provided with a plurality of recessed parts arranged at intervals along the circumferential direction, and an edge for user operation is formed between two adjacent recessed parts.

[0035] Compared with the prior art, the advantages of the utility model are: a safety air relief valve for a steam cleaning machine is composed of a valve cap, a valve seat, a transmission cap, a first elastic member and a valve core assembly. When the steam generator works normally to generate steam and causes a relatively high internal pressure, the air intake pressure of the valve core reaches a first preset pressure and is less than a second preset pressure. Under the action of air pressure, the push rod drives the transmission cap to move upward and separate from the valve seat, so that the transmission cap and the valve seat are released from the circumferential limit. In this way, the user can only drive the transmission cap to rotate when rotating the valve cap, and the transmission cap cannot drive the valve seat to rotate, and the entire safety air relief valve cannot be removed, thereby avoiding the release of steam in the steam generator due to misoperation to scald the user. The structure is simple and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the safety air relief valve for a steam cleaning machine of the utility model when the air intake pressure of the valve seat is less than a first preset pressure;

[0037] Figure 2 for Figure 1 Schematic diagram of the three-dimensional decomposition of

[0038] Figure 3 for Figure 1 A longitudinal cross-sectional view of

[0039] Figure 4 for Figure 3 A longitudinal cross-sectional view after the intake pressure of the middle valve seat reaches a first preset pressure and is less than a second preset pressure;

[0040] Figure 5 for Figure 4 A longitudinal cross-sectional view of the middle valve seat after the intake pressure reaches a second preset pressure. DETAILED DESCRIPTION

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0043] like Figures 1 to 5 FIG. 1 is a preferred embodiment of the safety air release valve for steam cleaning machine of the utility model. The safety air release valve for steam cleaning machine comprises a valve cap 1, a valve seat 2, a transmission cap 3, a first elastic member 4 and a valve core assembly 5.

[0044] The inside of the valve bonnet 1 has a receiving groove 11 which opens downward and extends axially; a limiting plate 12 is installed at the bottom of the valve bonnet 1; the outer peripheral wall of the valve bonnet 1 has a plurality of recessed portions 13 arranged at intervals along the circumferential direction, and an edge 14 for user operation is formed between two adjacent recessed portions 13.

[0045] The valve seat 2 is cylindrical. Specifically, a limiting flange 21 is convexly provided on the outer peripheral wall in the middle of the valve seat 2, and the limiting flange 21 is sandwiched between the valve cap 1 and the limiting plate 12. The upper part of the valve seat 2 extends into the accommodating groove 11, and the outer peripheral wall at the lower part of the valve seat 2 has an external thread for connecting with the steam generator of the steam cleaning machine; an annular protrusion 22 is convexly provided on the inner peripheral wall in the middle of the valve seat 2; a limiting cover 23 is threadedly connected to the top of the inner cavity of the valve seat 2; a first steam exhaust hole 24 that is connected to the inner cavity of the valve seat 2 is provided on the peripheral wall at the upper part of the valve seat 2; a second steam exhaust hole 25 that is connected to the inner cavity of the valve seat 2 is provided at a position corresponding to the external thread on the peripheral wall at the lower part of the valve seat 2, which is convenient for exhausting steam after use.

[0046] The transmission cap 3 can be axially slidably installed in the receiving groove 11 and is located above the valve seat 2. Specifically, the outer circumferential wall and the inner circumferential wall of the transmission cap 3 are both regular hexagons, the inner circumferential wall of the receiving groove 11 is a regular hexagon matching the outer circumferential wall of the transmission cap 3, and the outer circumferential wall of the upper part of the valve seat 2 is a regular hexagon matching the inner circumferential wall of the transmission cap 3, so the transmission cap 3 and the valve cap 1 are circumferentially limited, and when the transmission cap 3 is covered on the top of the valve seat 2, the transmission cap 3 is also circumferentially limited with the valve seat 2; a mounting groove 31 is provided on the top surface of the transmission cap 3.

[0047] The first elastic member 4 is a compression spring, which is installed in the accommodating groove 11, and its lower part is accommodated in the installation groove 31, and the two ends of the compression spring respectively abut against the bottom surface inside the installation groove 31 and the top surface inside the accommodating groove 11, so that the transmission cap 3 always has a tendency to move downward.

[0048] The valve core assembly 5 includes a first valve core 51 , a second valve core 52 and a second elastic member 53 .

[0049] Specifically, the first valve core 51 is axially slidably installed in the valve seat 2; the first valve core 51 has an axially extending sliding cavity 511 inside, and the bottom end of the sliding cavity 511 has an opening; a sealing seat 512 is convexly provided on the outer peripheral wall of the bottom of the first valve core 51, and a first sealing ring 513 is installed at the bottom of the sealing seat 512;

[0050] The second valve core 52 is axially slidably installed in the sliding chamber 511; a top rod 521 extending axially and extending outward from the sliding chamber 511 is convexly provided on the top of the second valve core 52, and the top rod 521 is exposed on the valve seat 2 and supported on the bottom of the transmission cap 3; a second sealing ring 522 is installed on the periphery of the second valve core 52 to seal with the inner peripheral wall of the sliding chamber 511;

[0051] The second elastic member 53 is a compression spring installed in the valve seat 2 and sleeved on the outer periphery of the first valve core 51, and the two ends of the compression spring are respectively abutted against the sealing seat 512 and the limit cover 23, so that the first valve core 51 always has a tendency to move downward.

[0052] When the intake pressure of the valve seat 2 is less than the first preset pressure, Figure 3 As shown, the transmission cap 3 moves downward under the elastic force of the first elastic member 4 and covers the top of the valve seat 2, so that the transmission cap 3 and the valve seat 2 maintain circumferential limit, and at the same time drive the second valve core 52 to move downward and abut against the annular protrusion 22; at the same time, the first valve core 51 moves downward under the elastic force of the second elastic member 53, so that the sealing seat 512 of the first valve core 51 abuts against the annular protrusion 22 and seals with the annular protrusion 22 through the first sealing ring 513, thereby disconnecting the first exhaust hole 24 from the lower part of the inner cavity of the valve seat 2;

[0053] When the intake pressure of the valve core 2 reaches the first preset pressure and is less than the second preset pressure (the second preset pressure is greater than the first preset pressure), Figure 4 As shown, the push rod 521 moves upward under the action of air pressure and abuts against the top surface of the sliding cavity 511, and at the same time drives the transmission cap 3 to move upward and separate from the valve seat 2, so that the transmission cap 3 and the valve seat 2 are released from the circumferential limit; at the same time, the sealing seat 512 of the first valve core 51 is still abutted against the annular protrusion 22 and is sealed with the annular protrusion 22 through the first sealing ring 513, and the first exhaust hole 24 and the lower part of the inner cavity of the valve seat 2 are still in a disconnected state;

[0054] When the intake pressure of the valve seat 2 reaches the second preset pressure, Figure 5 As shown, the transmission cap 3 is still separated from the valve seat 2; at the same time, the first valve core 51 moves upward under the action of air pressure, so that the top surface of the first valve core 51 abuts against the limit cover 23, so that the first exhaust hole 24 is connected to the lower part of the inner cavity of the valve seat 2.

[0055] The working principle of this embodiment is as follows: when in use, the lower part of the valve seat 2 is threadedly connected to the steam generating pot of the steam cleaning machine;

[0056] (1) Normal water adding process: When the steam generator stops working for a period of time, its internal pressure is relatively small. At this time, the air inlet pressure of the valve seat 2 is less than the first preset pressure. Figure 3 As shown, the transmission cap 3 moves downward under the elastic force of the first elastic member 4 and covers the top of the valve seat 2, so that the transmission cap 3 and the valve seat 2 are kept circumferentially limited. Since the transmission cap 3 and the valve cap 1 are always kept circumferentially limited, the user only needs to rotate the valve cap 1 to drive the valve seat 2 to rotate through the transmission cap 3, and the entire safety relief valve is unscrewed from the steam generator, and then the water adding operation can be performed;

[0057] (2) Safety protection process: When the steam generator is working normally and produces steam, the internal pressure is relatively high. At this time, the air inlet pressure of the valve core 2 reaches the first preset pressure and is less than the second preset pressure. Figure 4As shown, the push rod 521 moves upward under the action of air pressure and abuts against the top surface of the sliding cavity 511, and at the same time drives the transmission cap 3 to move upward and separate from the valve seat 2, so that the transmission cap 3 and the valve seat 2 are released from the circumferential limit. In this way, the user can only drive the transmission cap 3 to rotate when rotating the valve cap 1, and the transmission cap 3 cannot drive the valve seat 2 to rotate, and the entire safety relief valve cannot be removed, so as to avoid the steam in the steam generator being released due to misoperation and scalding the user;

[0058] At the same time, the sealing seat 512 of the first valve core 51 abuts against the annular protrusion 22 under the elastic force of the second elastic member 53 and is sealed with the annular protrusion 22 through the first sealing ring 513, and the first steam exhaust hole 24 is disconnected from the lower part of the inner cavity of the valve seat 2 to prevent steam leakage;

[0059] (3) Pressure relief protection process: When the steam generator operates abnormally, high pressure is generated. At this time, the intake pressure at the valve seat 2 reaches the second preset pressure, such as Figure 5 As shown, the transmission cap 3 is still separated from the valve seat 2, and the user cannot remove the entire safety relief valve;

[0060] At the same time, the first valve core 51 moves upward under the action of air pressure, so that the top surface of the first valve core 51 abuts against the limit cover 23, so that the first steam exhaust hole 24 is connected with the lower part of the inner cavity of the valve seat 2, and the steam is discharged into the outside atmosphere through the first steam exhaust hole 24, and the pressure relief is completed.

Claims

1. A safety relief valve for a steam cleaning machine, characterized in that Included are: A valve cap (1) having an accommodating groove (11) with an opening facing downward and extending in the axial direction; The valve seat (2) is cylindrical and fixed relative to the valve cap (1), with the upper portion extending into the receiving groove (11) and the lower portion being used to connect with the steam generating pot of the steam cleaning machine; A transmission cap (3) is axially slidably mounted in the receiving groove (11) and is located above the valve seat (2). The transmission cap (3) and the valve cap (1) are circumferentially limited. When the transmission cap (3) is covered on the top of the valve seat (2), the transmission cap (3) and the valve seat (2) are circumferentially limited. A first elastic member (4) acts between the transmission cap (3) and the valve cap (1) so that the transmission cap (3) always has a tendency to move downward; and A valve core assembly (5) is axially slidably mounted in the valve seat (2), and has a push rod (521) extending in the axial direction, wherein the push rod (521) is exposed outside the valve seat (2) and supported on the bottom of the transmission cap (3); When the air intake pressure of the valve seat (2) is less than a first preset pressure, the transmission cap (3) moves downward under the elastic force of the first elastic member (4) and covers the top of the valve seat (2), so that the transmission cap (3) and the valve seat (2) maintain circumferential limiting. When the air intake pressure of the valve seat (2) reaches a first preset pressure, the push rod (521) drives the transmission cap (3) to move upward and detach from the valve seat (2) under the action of air pressure, so that the transmission cap (3) and the valve seat (2) are released from circumferential limitation.

2. The safety relief valve for a steam cleaning machine according to claim 1, characterized in that: A first steam exhaust hole (24) communicating with the inner cavity of the valve seat (2) is provided on the peripheral wall of the valve seat (2); The valve core assembly (5) comprises A first valve core (51) is axially slidably mounted in the valve seat (2), and has an axially extending sliding cavity (511) therein; The second valve core (52) is axially slidably mounted in the sliding cavity (511), and the push rod (521) is protruding from the top of the second valve core (52) and extending out of the sliding cavity (511); and A second elastic member (53) acts between the first valve core (51) and the valve seat (2) so that the first valve core (51) always has a tendency to move downward; When the air intake pressure of the valve seat (2) is less than a second preset pressure, the first valve core (51) moves downward under the elastic force of the second elastic member (53) to disconnect the first steam exhaust hole (24) from the lower part of the inner cavity of the valve seat (2); When the air intake pressure of the valve seat (2) reaches a second preset pressure, the first valve core (51) moves upward under the action of air pressure to connect the first steam exhaust hole (24) with the lower part of the inner cavity of the valve seat (2); The second preset pressure is greater than the first preset pressure.

3. The safety relief valve for a steam cleaning machine according to claim 2, characterized in that: An annular protrusion (22) is convexly provided on the inner peripheral wall of the middle part of the valve seat (2), a limit cover (23) is installed on the top of the inner cavity of the valve seat (2), and a sealing seat (512) is convexly provided on the outer peripheral wall of the bottom of the first valve core (51); When the air intake pressure of the valve seat (2) is less than a second preset pressure, the sealing seat (512) abuts against the annular protrusion (22); When the air intake pressure of the valve seat (2) reaches a second preset pressure, the top surface of the first valve core (51) abuts against the limit cover (23).

4. The safety relief valve for a steam cleaning machine according to claim 3, characterized in that: A first sealing ring (513) is installed at the bottom of the sealing seat (512), and when the air intake pressure of the valve seat (2) is less than a second preset pressure, the first sealing ring (513) is in sealing cooperation with the annular protrusion (22); A second sealing ring (522) is installed on the periphery of the second valve core (52) and is in sealing cooperation with the inner peripheral wall of the sliding chamber (511).

5. The safety relief valve for a steam cleaning machine according to claim 3, characterized in that: The second elastic member (53) is a compression spring installed in the valve seat (2). The compression spring is sleeved on the outer periphery of the first valve core (51), and the two ends of the compression spring are respectively abutted against the sealing seat (512) and the limit cover (23).

6. The safety relief valve for a steam cleaning machine according to claim 3, characterized in that: The bottom end of the sliding cavity (511) has an opening; When the air intake pressure of the valve seat (2) is less than the first preset pressure, the second valve core (52) abuts against the annular protrusion (22); When the air intake pressure of the valve seat (2) reaches a first preset pressure, the second valve core (52) abuts against the top surface of the sliding chamber (511).

7. The safety relief valve for a steam cleaning machine according to claim 1, characterized in that: A mounting groove (31) is provided on the top surface of the transmission cap (3); the first elastic member (4) is a compression spring installed in the receiving groove (11); the lower part of the compression spring is received in the mounting groove (31), and the two ends of the compression spring respectively abut against the bottom surface inside the mounting groove (31) and the top surface inside the receiving groove (11).

8. The safety relief valve for a steam cleaning machine according to claim 1, characterized in that: The outer circumferential wall and the inner circumferential wall of the transmission cap (3) are both regular polygons, the inner circumferential wall of the accommodating groove (11) is a regular polygon matching the outer circumferential wall of the transmission cap (3), and the outer circumferential wall of the upper part of the valve seat (2) is a regular polygon matching the inner circumferential wall of the transmission cap (3).

9. The safety relief valve for a steam cleaning machine according to claim 1, characterized in that: A limiting plate (12) is installed at the bottom of the valve bonnet (1), and a limiting flange (21) is protrudingly provided on the outer peripheral wall in the middle of the valve seat (2). The limiting flange (21) is sandwiched between the valve bonnet (1) and the limiting plate (12).

10. The safety relief valve for a steam cleaning machine according to any one of claims 1 to 9, characterized in that: The outer peripheral wall of the valve cap (1) is provided with a plurality of recessed portions (13) arranged at intervals in the circumferential direction, and an edge (14) for user operation is formed between two adjacent recessed portions (13).

Images