Pressure reducing valve with improved diaphragm structure

Abstract

The utility model discloses a pressure reducing valve with an improved diaphragm structure, which comprises a valve body, a first fluid passage, a second fluid passage, a pilot valve chamber and a main valve chamber are arranged in the valve body, a third fluid passage is arranged at the bottom end of the main valve chamber, and a fourth fluid passage is arranged on one side of the third fluid passage; the main valve is arranged in the main valve cavity and used for controlling opening and closing of the third fluid channel; the pilot valve mechanism comprises a diaphragm, a pilot valve element and a first reset device, the diaphragm completely blocks the pilot valve cavity to form an upper cavity and a lower cavity, the upper cavity is communicated with the main valve cavity, a through hole is formed in the bottom end of the lower cavity, the pilot valve element is used for controlling opening and closing of the through hole, and the diaphragm is downwards concavely provided with a groove part; according to the pressure reducing valve, the groove part is arranged on the diaphragm, the groove part enables the groove part to protrude upwards and deform when the diaphragm is pushed by fluid in the pressure reducing valve to deform upwards, and therefore damage to the diaphragm is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure reducing valve technical field, especially in a pressure reducing valve of diaphragm structure improvement. BACKGROUND

[0002] With the rapid development of modern industry, the operating pressure of various equipment is increasing, and as the key safety protection equipment, pressure reducing valve plays a vital role, they can link or maintain the stable pressure in the equipment, thereby effectively protecting the safety of equipment and personnel.

[0003] The diaphragm used in the existing market pressure reducing valve is mostly flat diaphragm, and the deformation of the diaphragm caused by the fluid in the pressure reducing valve will cause great damage to the diaphragm itself.

[0004] Based on the above reasons, it is necessary to improve the prior art. UTILITY MODEL CONTENT

[0005] I. Technical problems to be solved

[0006] The utility model is in view of prior art exists above-mentioned defect, specially presents a pressure reducing valve of diaphragm structure improvement to solve the problem in above-mentioned background art.

[0007] In order to solve the above technical problems, the utility model provides a pressure reducing valve of diaphragm structure improvement, including the valve body, be provided with first fluid passage, second fluid passage, pilot valve chamber and with the pilot valve chamber intercommunication main valve chamber in the valve body, the main valve chamber bottom end is provided with one with the third fluid passage of intercommunication with outside, fourth fluid passage is provided with with second fluid passage intercommunication in the third fluid passage one side;

[0008] Main valve, the main valve is arranged in the main valve chamber, and is used for controlling the opening and closing of the third fluid passage;

[0009] It further includes pilot valve mechanism, the pilot valve mechanism includes fixedly arranged in the pilot valve chamber diaphragm, the pilot valve core that sets up in the center position of diaphragm and sets up in the pilot valve core one end and is used for resetting the first reset device of pilot valve core, the diaphragm completely blocks the pilot valve chamber and makes it form upper chamber and lower chamber, the upper chamber is communicated with the main valve chamber, the lower chamber bottom end is provided with the through hole for intercommunication first fluid passage and second fluid passage, the pilot valve core is used for controlling the opening and closing of the through hole, the diaphragm is concave with the groove in the lower, the groove is provided with a first damping hole that intercommunication upper chamber and lower chamber.

[0010] In the above technical solution, one end of the diaphragm protrudes a limiting part, and a fixing hole for screw fixing is formed on the limiting part.

[0011] In the technical scheme, the first reset device is a reset spring.

[0012] In the technical scheme, the main valve comprises a main valve seat fixedly arranged in the main valve chamber, a main valve core movably arranged in the main valve seat, and a second reset device arranged between the main valve core and the main valve seat.

[0013] In the technical scheme, the second reset device is a reset spring.

[0014] In the technical scheme, the main valve seat is provided with a thread on the side, and the main valve chamber is provided with a groove matched with the thread.

[0015] In the technical scheme, the main valve core is provided with a sealing block fixedly arranged at the position where the main valve core abuts against the third fluid passage.

[0016] In the technical scheme, the pilot valve chamber and the main valve chamber are communicated through a second damping hole.

[0017] Beneficial effects

[0018] Compared with the prior art, the utility model discloses the following beneficial effects: the utility model discloses the groove part on the diaphragm, and the groove part is protruded and deformed upward when the diaphragm is deformed upward by the fluid in the pressure reducing valve, thereby reducing the damage to the diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0020] Figure 2 It is the cross section structure schematic diagram of the utility model.

[0021] Figure 3 It is the part cross section structure schematic diagram of the utility model.

[0022] Figure 4 It is the structure schematic diagram of the diaphragm of the utility model.

[0023] In the figure: 1 is a valve body, 10 is a first fluid passage, 11 is a second fluid passage, 12 is a pilot valve chamber, 13 is a main valve chamber, 120 is an upper chamber, 121 is a lower chamber, 130 is a third fluid passage, 131 is a fourth fluid passage, 1000 is a second damping hole, 1210 is a through hole, 2 is a main valve, 20 is a main valve seat, 21 is a main valve core, 22 is a second reset device, 200 is a thread, 210 is a sealing block, 3 is a pilot valve mechanism, 30 is a diaphragm, 31 is a pilot valve core, 32 is a first reset device, 300 is a groove, 301 is a first damping hole, 302 is a limiting portion, 303 is a fixing hole. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0025] Please refer to Figures 1-4 The utility model provides a diaphragm structure improved pressure reducing valve, including valve body 1, first fluid passage 10, second fluid passage 11, pilot valve chamber 12 and with pilot valve chamber 12 communication's main valve chamber 13 are set up in valve body 1, the third fluid passage 130 of a with outside communication is set up in main valve chamber 13 bottom end, the fourth fluid passage 131 of a with second fluid passage 11 communication is set up in third fluid passage 130 one side,

[0026] Main valve 2, main valve 2 sets up in main valve chamber 13, and is used for controlling the opening and closing of third fluid passage 130;

[0027] Still include pilot valve mechanism 3, pilot valve mechanism 3 includes fixedly set in pilot valve chamber 12 diaphragm 30, set in the center position of diaphragm 30 pilot valve core 31 and set in pilot valve core 31 one end and is used for resetting pilot valve core 31 first reset device 32, diaphragm 30 completely blocks pilot valve chamber 12 makes it form upper chamber 120 and lower chamber 121, upper chamber 120 with main valve chamber 13 communication, lower chamber 121 bottom end is set up and is used for the through hole 1210 of communication first fluid passage 10 and second fluid passage 11, pilot valve core 31 is used for controlling the opening and closing of through hole 1210, diaphragm 30 is concave with groove 300 downwards, a first damping hole 301 of communication upper chamber 120 and lower chamber 121 is set up in groove 300.

[0028] In the structure, after the first fluid channel is filled with fluid, the fluid flows from the first fluid channel to the lower chamber, the diaphragm is deformed upward by the fluid, the groove part provided in the diaphragm is deformed upward by the upward force, the pilot valve core is moved upward by the diaphragm so that the through hole is opened, part of the fluid enters the second fluid channel through the through hole, the remaining fluid flows into the upper chamber through the first damping hole provided on the groove part, and then flows into the main valve chamber through the second damping hole, the fluid in the main valve chamber pushes the main valve, the third fluid channel is opened by the main valve, part of the fluid in the third fluid channel flows out of the pressure reducing valve through the third fluid channel, and the remaining fluid enters the second fluid channel through the fourth fluid channel. The use of the diaphragm with the groove part can make the groove part provided on the diaphragm deformed upward when the diaphragm is deformed by the fluid in the pressure reducing valve, thereby reducing the damage to the diaphragm when the diaphragm is deformed.

[0029] Specifically, the diaphragm 30 protrudes a limiting part 302 at one end, and a fixing hole 303 for fixing a screw is formed in the limiting part 302, which can fix the position of the diaphragm.

[0030] Specifically, the first reset device 32 is a reset spring, and the use of the reset spring as the first reset device can ensure that the pilot valve core quickly returns to the position after the pressure changes, which helps to maintain the stability of the internal pressure.

[0031] Specifically, the main valve 2 includes a main valve seat 20 fixedly arranged in the main valve chamber 13, a main valve core 21 movably arranged in the main valve seat 20, and a second reset device 22 arranged between the main valve core 21 and the main valve seat 20. The use of the second reset device to reset the main valve core in the main valve can ensure the automatic reset of the main valve, achieving the effect of multiple uses.

[0032] Specifically, the second reset device 22 is a reset spring, which can ensure that the main valve core quickly returns to the position after the pressure changes, which helps to maintain the stability of the internal pressure.

[0033] Specifically, the main valve seat 20 protrudes a thread 200 on the side, and the main valve chamber 13 is provided with a groove matched with the thread 200, and the thread and the groove are connected stably and conveniently adjusted.

[0034] Specifically, the bottom end of the main valve core 21 abuts against the third fluid channel 130, and a sealing block 210 is fixedly arranged at the position where the main valve core 21 abuts against the third fluid channel 130, and the sealing block can further increase the sealing effect of the main valve core on the third fluid channel.

[0035] Specifically, the pilot valve chamber 12 and the main valve chamber 13 are communicated through a second damping hole 1000, the second damping hole has a smaller hole diameter, fluid passing through the second damping hole will generate a larger resistance, thereby causing fluid pressure to drop, so that the fluid pressure in the main valve chamber is less than the fluid pressure in the pilot valve chamber, forming a pressure difference.

[0036] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the technical field, without departing from the technical principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An improved pressure reducing valve with diaphragm structure, comprising: a valve body (1) provided with a first fluid passage (10), a second fluid passage (11), a pilot valve chamber (12) and a main valve chamber (13) communicating with the pilot valve chamber (12), the main valve chamber (13) being provided with a third fluid passage (130) at the bottom end thereof and communicating with the outside, and the third fluid passage (130) being provided with a fourth fluid passage (131) at one side thereof and communicating with the second fluid passage (11); a main valve (2) arranged in the main valve chamber (13) and used for controlling the opening and closing of the third fluid passage (130); characterized in that it further comprises: a pilot valve mechanism (3) comprising a diaphragm (30) fixedly arranged in the pilot valve chamber (12), a pilot valve spool (31) arranged at the center of the diaphragm (30), and a first reset device (32) arranged at one end of the pilot valve spool (31) and used for resetting the pilot valve spool (31), the diaphragm (30) completely blocking the pilot valve chamber (12) to form an upper chamber (120) and a lower chamber (121), the upper chamber (120) communicating with the main valve chamber (13), the lower chamber (121) being provided with a through hole (1210) at the bottom end thereof and used for communicating the first fluid passage (10) and the second fluid passage (11), the pilot valve spool (31) being used for controlling the opening and closing of the through hole (1210), and the diaphragm (30) being concavely provided with a groove portion (300), the groove portion (300) being provided with a first damping hole (301) communicating the upper chamber (120) and the lower chamber (121).

2. The improved pressure reducing valve with diaphragm structure according to claim 1, characterized in that: one end of the diaphragm (30) is provided with a limiting portion (302), and the limiting portion (302) is provided with a fixing hole (303) used for screwing.

3. The improved pressure reducing valve with diaphragm structure according to claim 1, characterized in that: the first reset device (32) is a reset spring.

4. The improved pressure reducing valve with diaphragm structure according to claim 1, characterized in that: the main valve (2) comprises a main valve seat (20) fixedly arranged in the main valve chamber (13), a main valve spool (21) movably arranged in the main valve seat (20), and a second reset device (22) arranged between the main valve spool (21) and the main valve seat (20).

5. The improved pressure reducing valve with diaphragm structure according to claim 4, characterized in that: the second reset device (22) is a reset spring.

6. The improved pressure reducing valve with diaphragm structure according to claim 4, characterized in that: the main valve seat (20) is provided with a thread (200) at the peripheral side thereof, and the main valve chamber (13) is provided with a groove matched with the thread (200).

7. The improved pressure reducing valve with diaphragm structure according to claim 4, characterized in that: The bottom end of the main valve core (21) abuts against the third fluid passage (130), and a sealing block (210) is fixedly arranged at the position where the main valve core (21) abuts against the third fluid passage (130).

8. The pressure relief valve with improved diaphragm structure according to claim 1, wherein: The pilot valve chamber (12) and the main valve chamber (13) are communicated through a second damping hole (1000).

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