Pressure relief device of high-pressure system

Abstract

The utility model discloses a pressure relief device for a high-pressure system, which belongs to the field of R744 refrigerating systems and comprises a valve body, a through channel is arranged in the center of the valve body, one end of the channel is provided with a pressure relief hole, and the other end of the channel is provided with an adjusting threaded hole. An adjusting nut is screwed in the adjusting threaded hole, and a through exhaust hole is formed in the center of the adjusting nut; a pressure relief hole is formed in the adjusting nut, a core shaft is further arranged in the channel, an elastic piece is arranged between the core shaft and the adjusting nut, the elastic force of the elastic piece enables the core shaft to block the pressure relief hole, the pressure relief hole comprises a taper hole (11), and the diameter of the taper hole (11) is gradually increased in the pressure relief direction; the end, close to the pressure relief hole, of the mandrel (2) is provided with an arc face (21), and the end, provided with the arc face (21), of the mandrel (2) can abut against the taper face of the taper hole (11). According to the structure, the long service life can be guaranteed, and the sealing state can be rapidly and stably recovered after pressure relief.

Description

TECHNICAL FIELD

[0001] The utility model relates to R744 refrigeration system field, concretely relates to a high pressure system pressure relief device. BACKGROUND

[0002] R744 refrigeration system mainly adopts transcritical cycle. In this cycle process, carbon dioxide refrigerant is compressed into supercritical state in the compressor, transcritical cycle needs to bear higher pressure (usually above 7.5Mpa), in order to avoid system damage due to excessively high pressure, such as pipe rupture, container explosion and other serious accidents, often need to set pressure relief device.

[0003] However, most of the current pressure relief device structure is complex, and the related sealing structure is under high pressure for a long time and has low service life.

[0004] In view of the above problem, the utility model discloses a high pressure system pressure relief device to overcome the above-mentioned defects. UTILITY MODEL CONTENTS

[0005] For the problems existing in the prior art, the high pressure system pressure relief device provided by the utility model can ensure a longer service life, and can quickly and stably restore the sealing state after pressure relief.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme as follows: a high pressure system pressure relief device, including valve body, the valve body center is equipped with the channel that penetrates, one end of the channel is equipped with pressure relief hole, the other end of the channel is equipped with adjusting screw hole;

[0007] The adjusting screw hole is screwed with adjusting nut, and the adjusting nut is provided with a through exhaust hole in the center;

[0008] The channel is also provided with a mandrel, and an elastic member is arranged between the mandrel and the adjusting nut, the elastic force of the elastic member makes the mandrel block the pressure relief hole;

[0009] The pressure relief hole includes a taper hole, and the diameter of the taper hole gradually increases in the pressure relief direction;

[0010] The end of the mandrel close to the pressure relief hole is provided with a circular arc surface, and the end of the mandrel with the circular arc surface can abut on the taper surface of the taper hole.

[0011] Preferably, the mandrel is made of polyether ether ketone material.

[0012] Preferably, a guide circular table is arranged on the mandrel, and the guide circular table can be guided and slidably matched with the channel.

[0013] At least one notch axially penetrating the guide circular table is arranged on the sidewall of the guide circular table or on the guide circular table.

[0014] Preferably, the first positioning column is arranged on the end of the adjusting nut close to the shaft, and the second positioning column is arranged on the end of the adjusting nut close to the shaft.

[0015] The elastic member is a spring.

[0016] The end of the spring is sleeved on the first positioning column and / or the second positioning column.

[0017] Preferably, the tool hole is arranged on the end of the adjusting nut away from the shaft, and the tool hole is matched with a rotating tool to drive the adjusting nut to rotate.

[0018] Preferably, the sealing installation ring groove is arranged on the end face of the valve body close to the pressure relief hole, and the sealing ring is arranged in the sealing installation ring groove.

[0019] Preferably, the sealing ring is made of polyether ether ketone.

[0020] Preferably, the fastening ring groove is arranged on one side wall of the sealing installation ring groove, the depth of the fastening ring groove is 0.1-0.3mm, and the width of the fastening ring groove is 0.5-1.1mm.

[0021] Preferably, the outer thread is arranged on the outer side of the valve body away from the pressure relief hole, and the compression nut is screwed on the outer thread of the valve body.

[0022] The inner hole of the compression nut is provided with a boss, and the boss can be pressed against the end face of the adjusting nut.

[0023] Preferably, the dustproof film is arranged on the end face of the tool hole to block the exhaust hole, and the dustproof film can be blown open by the pressure relief gas in the pressure relief process.

[0024] The utility model discloses the beneficial effect lies in:

[0025] 1. The utility model discloses a adjusting nut and channel are screwed together, and the exhaust hole is arranged in the center of the adjusting nut, so that the connection strength between the adjusting nut and the channel is guaranteed, the impact of high-pressure gas can be withstood, the service life of the whole is indirectly improved, compared with the traditional adjusting nut, the exhaust channel is arranged on the side wall of the adjusting nut, so that the threaded connection between the adjusting nut and the channel is discontinuous, the adjusting nut is loosened during the pressure relief process, and the connection strength between the adjusting nut and the channel is also affected.

[0026] 2. The utility model discloses a core shaft end part utilizes the arc surface and the taper hole on the pressure relief hole cooperation, improved both sealing cooperation effect, and the arc surface and taper hole contact place will form line surface contact, and the contact area is small, is favorable to the arc surface quick departure taper surface quick pressure relief when pressure relief exhaust, can effectively avoid the structure attachment phenomenon after contact, further through the combination of polyether ether ketone material core shaft, not only can bear the comparatively big pressure value, and sealed characteristic is good.

[0027] 3. The utility model discloses the help of compression nut pressure resistance in adjusting nut end face, avoided the influence of adjusting nut because of loosening to pressure relief pressure value, guaranteed the stability of pressure relief pressure value, further improved the security.

[0028] 4. Through setting up fastening ring groove on the sealing installation ring groove lateral wall, can ensure that the sealing ring can be fastened to install in the sealing installation ring groove after again removing after the compression deformation of sealing ring. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic view when the high pressure system pressure relief device is in the sealed state.

[0030] Figure 2 It is the front view of the utility model core shaft.

[0031] Figure 3 It is the plan view of the utility model core shaft notch on the guide circular table lateral wall.

[0032] Figure 4 It is the plan view of the utility model core shaft notch on the guide circular table.

[0033] Figure 5 It is the section view of the utility model adjusting nut.

[0034] Figure 6 It is the section view of the utility model A-A direction.

[0035] Figure 7 It is the section view of the utility model valve body.

[0036] Figure 8 It is a schematic view when the high pressure system pressure relief device exhausts.

[0037] In the drawing: 1, valve body, 2, core shaft, 3, adjusting nut, 4, compression nut, 5, elastic piece, 6, sealing ring, 7, dustproof film, 11, taper hole, 12, passageway, 13, adjusting screw hole, 14, outer thread, 15, sealing installation ring groove, 16, fastening ring groove, 21, arc surface, 22, guide circular table, 23, first positioning column, 24, notch, 31, exhaust hole, 32, tool hole, 33, second positioning column. DETAILED DESCRIPTION

[0038] For the convenience of those skilled in the art to understand, the utility model is further explained below in combination with the drawings.

[0039] As Figures 1 to 8 The utility model discloses a high pressure system pressure relief device, including valve body 1, the valve body 1 center is equipped with the passage 12 that penetrates, the passage 12 one end is equipped as pressure relief hole, when pressure relief, high pressure gas is discharged into the passage 12 through pressure relief hole.

[0040] The other end of the passage 12 is provided with an adjusting threaded hole 13, and an adjusting nut 3 is screwed in the adjusting threaded hole 13. The adjusting nut 3 is provided with a through exhaust hole 31 in the center. The high pressure gas entering the passage 12 will be discharged to the outside through the exhaust hole 31.

[0041] The passage 12 is also provided with a mandrel 2. An elastic element 5 is arranged between the mandrel 2 and the adjusting nut 3. The elastic force of the elastic element 5 causes the mandrel 2 to block the pressure relief hole. The specific pressure relief pressure value is determined according to the elastic force of the elastic element 5.

[0042] The above structure screws the adjusting nut 3 with the passage 12, and sets the exhaust hole 31 in the center of the adjusting nut 3, which ensures the connection strength between the adjusting nut 3 and the passage 12, and can withstand the impact of high pressure gas, thereby indirectly improving the service life of the whole. Compared with the traditional adjusting nut, the exhaust passage is arranged on the side wall of the adjusting nut, which causes the threaded connection between the two to be discontinuous. During the pressure relief process, the adjusting nut is prone to loosening, and the connection strength between the adjusting nut and the passage is also affected.

[0043] The pressure relief hole of the utility model comprises a tapered hole 11. The diameter of the tapered hole 11 gradually increases in the pressure relief direction. The taper a of the tapered hole 11 is preferably 45°±5°. The end of the mandrel 2 close to the pressure relief hole is provided with a circular arc surface 21. The end of the mandrel 2 with the circular arc surface 21 can abut against the tapered surface of the tapered hole 11. The above structure can effectively avoid the structure adhesion phenomenon after contact while ensuring the sealing fit effect.

[0044] The mandrel 2 is preferably made of polyether ether ketone material. This material can withstand relatively large pressure values and has good sealing properties without sticking characteristics after contact.

[0045] The mandrel 2 is provided with a guide circular table 22. The guide circular table 22 can guide and slide with the passage 12, thereby ensuring the sealing fit precision of the circular arc surface 21 of the mandrel 2 and the tapered hole 11. The outer diameter of the guide circular table 22 is preferably φ8.5-φ9mm. The inner diameter of the passage 12 that guides and cooperates with it is preferably φ8.5-9mm. A sliding gap of 0.05-0.2mm is preferably reserved between the two. This size structure can ensure that the relative sliding will not be affected by external force.

[0046] In order to ensure that the high-pressure gas enters the passage 12 through the pressure relief hole, at least one axial through gap 24 is arranged on the side wall of the guide cone 22 or on the guide cone 22, and the gap 24 in the embodiment is arranged on the side wall of the guide cone 22, and the gap 24 is a plane, and in order to improve the exhaust efficiency, the number of gaps 24 can be arranged to be multiple, and preferably arranged to be circumferentially distributed.

[0047] The first positioning column 23 is arranged on the end of the mandrel 2 close to the adjusting nut 3, the second positioning column 33 is arranged on the end of the adjusting nut 3 close to the mandrel 2, the exhaust hole 31 penetrates the second positioning column 33, the elastic member 5 is specifically a spring, and the end of the spring is sleeved on the first positioning column 23 and / or the second positioning column 33. Thus, the stability of the spring elastic force in the axial direction is ensured by the first positioning column 23 and the second positioning column 33.

[0048] The tool hole 32 is preferably arranged on the end of the mandrel 2 away from the exhaust hole 31, the tool hole 32 is preferably a hexagonal hole, the size is preferably 2-6 mm, the tool hole 32 is matched with a rotating tool to drive the adjusting nut 3 to rotate, so that the distance between the adjusting nut 3 and the mandrel 2 is adjusted by rotating the adjusting nut 3, and then the elastic force of the elastic member 5 is adjusted, and finally the adjustment of the pressure relief value is realized. The end face of the tool hole 32 is provided with a dustproof film 7 to block the exhaust hole 31, the dustproof film 7 can be blown open by the pressure relief gas in the pressure relief process, and the dustproof film 7 is fixed by the adhesive method, so that dust does not fall into the passage 12 of the valve body 1 in the normal state.

[0049] The valve body 1 is provided with a sealing installation ring groove 15 on the end face close to the pressure relief hole, the sealing ring 6 is arranged in the sealing installation ring groove 15, the sealing ring 6 is also preferably made of polyether ether ketone material, a fastening ring groove 16 is preferably arranged on one side groove wall of the sealing installation ring groove 15, the depth b of the fastening ring groove 16 is 0.1-0.3 mm, and the width c of the fastening ring groove 16 is 0.5-1.1 mm. The size can ensure that the sealing ring 6 can be tightly installed in the sealing installation ring groove 15 after being compressed and deformed again after being removed.

[0050] The outer side of the valve body 1 away from the pressure relief hole is provided with an external thread 14, the valve body 1 is screwed with a compression nut 4 on the external thread 14, a boss is arranged in the inner hole of the compression nut 4, and the boss can be pressed against the end face of the adjusting nut 3. This structure avoids the influence of the loosening of the adjusting nut 3 on the pressure relief pressure value, ensures the stability of the pressure relief pressure value, and improves the safety.

[0051] The specific working process of the utility model is as follows:

[0052] First, the predetermined pressure relief pressure value is set by adjusting the position of the adjusting nut 3, and the adjusting nut 3 is fixed by the compression nut 4. When the system operating pressure is less than the set pressure relief value of the pressure relief device, the pressure relief device does not act. When the system operating pressure is greater than the set pressure relief value of the pressure relief device, the end arc surface 21 of the mandrel 2 is separated from the tapered surface of the pressure relief hole under the action of pressure, and the gas pressure is relieved through the passage 12 and the exhaust hole 31 of the adjusting nut 3. After pressure relief, the system operating pressure will decrease. When the operating pressure decreases to the set pressure relief value of the pressure relief device, the end arc surface 21 of the mandrel 2 will continue to abut against the tapered surface of the pressure relief hole under the pressure of the spring, thereby achieving the sealing of the pressure relief device.

[0053] It should be understood that the use of these embodiments is only for the purpose of illustrating the present application and is not intended to limit the scope of protection of the present application. In addition, it should also be understood that after reading the technical content of the present application, those skilled in the art can make various modifications, modifications and / or variations to the present application, and all these equivalent forms also fall within the protection scope defined by the claims attached hereto.

Claims

1. A pressure relief device for a high pressure system, characterized in that Including valve body (1), the valve body (1) is equipped with the through channel (12) in the center, one end of the channel (12) is equipped as pressure relief hole, the other end of the channel (12) is equipped as adjusting threaded hole (13); The adjusting threaded hole (13) is screwed with adjusting nut (3), the adjusting nut (3) is equipped with the through exhaust hole (31) in the center; The channel (12) is further equipped with mandrel (2), the mandrel (2) is equipped with elastic element (5) between adjusting nut (3), and the elastic force of the elastic element (5) makes the mandrel (2) block the pressure relief hole; The pressure relief hole includes taper hole (11), the taper hole (11) gradually increases in diameter along the pressure relief direction; The mandrel (2) is equipped as circular arc surface (21) near one end of the pressure relief hole, and the mandrel (2) end with circular arc surface (21) can abut on the taper surface of taper hole (11).

2. A pressure relief device for a high pressure system according to claim 1, wherein The mandrel (2) is made of polyether ether ketone material.

3. The pressure relief device of claim 1, wherein the pressure relief device is configured to relieve pressure from a high pressure system. The mandrel (2) is equipped with guide circular table (22), and the guide circular table (22) can be guided and slid with the channel (12); At least one notch (24) is provided on the sidewall of the guide circular table (22) or on the guide circular table (22) and penetrates the guide circular table (22) in the axial direction.

4. The pressure relief device of claim 1, wherein the pressure relief device is configured to relieve pressure from a high pressure system. The mandrel (2) is equipped with first positioning column (23) near one end of the adjusting nut (3), and / or the adjusting nut (3) is equipped with second positioning column (33) near one end of the mandrel (2), and the exhaust hole (31) penetrates the second positioning column (33); The elastic element (5) is a spring; The spring is sleeved on the first positioning column (23) and / or the second positioning column (33).

5. The pressure relief device of claim 1, wherein the pressure relief device is configured to relieve pressure from a high pressure system. The exhaust hole (31) is equipped with tool hole (32) away from one end of the mandrel (2), and the tool hole (32) is matched with rotating tool to drive the adjusting nut (3) to rotate.

6. The pressure relief device of claim 1, wherein the pressure relief device is configured to relieve pressure from a high pressure system. The valve body (1) is equipped with sealing installation ring groove (15) on the end face near the pressure relief hole, and the sealing ring (6) is arranged in the sealing installation ring groove (15).

7. A pressure relief device for a high pressure system according to claim 6, wherein The sealing ring (6) is made of polyether ether ketone material.

8. The pressure relief device of claim 6, wherein the pressure relief device is configured to relieve pressure from a high pressure system. One side groove wall of the sealing installation ring groove (15) is equipped with fastening ring groove (16), the depth of the fastening ring groove (16) is 0.1-0.3mm, and the width of the fastening ring groove (16) is 0.5-1.1mm.

9. The pressure relief device of claim 1, wherein, The valve body (1) is equipped with external thread (14) on the outer side away from the pressure relief hole, and the valve body (1) is screwed with compression nut (4) on the external thread (14); The inner hole of the compression nut (4) is equipped with boss, and the boss can be pressed on the end face of the adjusting nut (3).

10. The pressure relief device of claim 5, wherein the pressure relief device is configured to relieve pressure from a high pressure system. The end face of the tool hole (32) is equipped with dustproof film (7) to block the exhaust hole (31), and the dustproof film (7) can be blown open by pressure relief gas during pressure relief.

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