A pressure relief check valve for rubber tire vulcanization and a vulcanization sizing tube set

Abstract

This invention provides a pressure relief check valve and a vulcanization shaping pipe assembly for rubber tire vulcanization. The pressure relief check valve has a first channel and a third channel connecting the valve cavity, and a second channel connecting the air release channel and the third channel, all on the valve stem. A first sealing element with a conical outer circumference is provided, with the smaller diameter end of the first sealing element facing the air inlet channel. In this way, nitrogen entering through the air inlet channel can compress the conical outer circumference of the first sealing element and enter the valve stem through the first channel, thus achieving air intake. When air intake ends and the pressure in the pipe connected to the valve stem is too high, nitrogen can flow back to the valve cavity through the first channel, and then sequentially through the third channel and the second channel before entering the exhaust channel. In this way, pressure relief can be achieved through the exhaust channel without the need for a nitrogen balancing valve, thus not affecting the service life and accuracy of the nitrogen balancing valve on the pipeline.

Description

Technical Field

[0001] This application relates to the technical field of pressure relief valves for rubber tire vulcanization, and in particular to a pressure relief check valve and a vulcanization shaping tube assembly for rubber tire vulcanization. Background Technology

[0002] In the tire manufacturing industry, the mainstream rubber tire vulcanization process currently employs nitrogen vulcanization. This involves filling the vulcanizing bladder inside the tire with high-pressure nitrogen to provide the necessary pressure and temperature conditions for rubber flow, tread pattern shaping, and cross-linking reactions. Tire vulcanization demands extremely high pressure precision. The flow and filling of the rubber compound at high temperatures, tread pattern formation, and tire carcass density all depend on stable pressure. Therefore, existing technologies typically use nitrogen balancing valves to dynamically adjust the pressure difference between the inlet and outlet, stabilizing the pressure inside the bladder at a set value to prevent defects such as blurred tread patterns, internal air bubbles, insufficient rubber, and uneven tire carcass density. However, the check valves used in existing vulcanization and shaping pipelines lack self-relief capabilities. Once the pressure in the pipeline exceeds the preset range, it needs to be relieved through the nitrogen balancing valve. Over time, this can damage the diaphragm of the nitrogen balancing valve, affecting its accuracy and lifespan. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application provides a pressure relief check valve and a vulcanization shaping pipe assembly for rubber tire vulcanization.

[0004] A first aspect of this application provides a pressure relief check valve for vulcanizing rubber tires, comprising a valve body, a valve stem, a first seal, and a stop component; One end of the valve stem is inserted into the valve body, forming a valve cavity together with the valve body; a first channel extending axially through the valve stem, a second channel extending radially through the valve stem, and a third channel connecting the valve cavity and the second channel axially are formed on the valve stem; the first channel is in communication with the valve cavity; an air intake channel is formed at the end of the valve body away from the valve stem; the air intake channel is in communication with the valve cavity; a first sealing element is disposed in the valve cavity; the first sealing element has a conical outer peripheral surface, and the end with the smaller diameter is disposed towards the air intake channel; a stop portion is disposed on the valve body, and an exhaust channel is formed inside it.

[0005] In some embodiments of this application, the first sealing element includes a cylindrical sealing body and a conical sealing portion disposed on the outer periphery of the sealing body; one end of the conical sealing portion is connected to one end of the sealing body, and the other end is provided with an annular groove spaced apart from the sealing body.

[0006] In some embodiments of this application, there are multiple first channels, and the multiple first channels are arranged around an axis.

[0007] In some embodiments of this application, a first sealing groove and a second sealing groove are formed on both sides of the second channel, which surround the valve stem in the circumferential direction; a sealing ring is provided in both the first sealing groove and the second sealing groove.

[0008] In some embodiments of this application, the first seal is made of high-temperature resistant rubber.

[0009] In some embodiments of this application, the end of the valve stem away from the valve body is recessed inward toward the valve body to form a connecting groove.

[0010] In some embodiments of this application, the valve stem has a protrusion at one end facing the valve body toward the valve cavity, and the third channel passes through the protrusion.

[0011] In some embodiments of this application, both the valve stem and the valve body are made of aluminum.

[0012] In some embodiments of this application, there are two second channels, which are perpendicular to each other; an annular groove is formed on the outer periphery of the valve stem, and the second channel communicates with the annular groove.

[0013] A second aspect of this application provides a vulcanization and shaping pipe assembly, including the aforementioned pressure relief check valve for rubber tire vulcanization, as well as a filter, a nitrogen balance valve, and a three-way shut-off valve; one end of the filter is connected to an air inlet pipe, and the other end is connected to the nitrogen balance valve; the other end of the nitrogen balance valve is connected to the pressure relief check valve; and the other end of the pressure relief check valve is connected to the three-way shut-off valve.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the pressure relief check valve and vulcanization shaping pipe assembly for rubber tire vulcanization of this application, the pressure relief check valve is provided with a first channel and a third channel connecting the valve cavity, and a second channel connecting the exhaust channel and the third channel on the valve stem. By providing a first sealing element with a conical outer peripheral surface, and with the smaller diameter end of the first sealing element facing the air inlet channel, nitrogen entering through the air inlet channel can compress the conical outer peripheral surface of the first sealing element and enter the valve stem through the first channel, thereby realizing air intake; when the air intake ends and the pressure in the pipe connected to the valve stem end is too high, nitrogen can flow back to the valve cavity through the first channel, and then sequentially enter the exhaust channel through the third channel and the second channel. In this way, exhaust and pressure relief can be carried out through the exhaust channel without the need for pressure relief through the nitrogen balance valve, which will not affect the service life and accuracy of the nitrogen balance valve on the pipeline.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0016] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a pressure relief check valve for vulcanizing rubber tires provided in an exemplary embodiment of this application; Figure 2 This is a front view of a pressure relief check valve for vulcanizing rubber tires provided in an exemplary embodiment of this application; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 2 Sectional view at point BB; Figure 5 This is a schematic diagram of the structure of a vulcanized and shaped tube assembly provided in an exemplary embodiment of this application.

[0017] In the picture: 10. Pressure relief check valve; 20. Filter; 30. Nitrogen balancing valve; 40. Three-way shut-off valve; 101. Valve body; 102. Valve stem; 103. First seal; 1031. Sealing body; 1032. Conical seal; 1033. Annular groove; 104. Stop component; 105. Valve cavity; 106. First channel; 107. Second channel; 108. Third channel; 109. Inlet channel; 110. Exhaust channel; 111. Connecting groove; 112. First sealing groove; 113. Second sealing groove; 114. Annular groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0019] In the tire manufacturing industry, the mainstream rubber tire vulcanization process currently employs nitrogen vulcanization. This involves filling the vulcanizing bladder inside the tire with high-temperature, high-pressure nitrogen to provide the necessary pressure and temperature conditions for rubber flow, tread pattern shaping, and cross-linking reactions. Tire vulcanization demands extremely high pressure precision. The flow and filling of the rubber compound at high temperatures, tread pattern formation, and tire carcass density all depend on stable pressure. Therefore, existing technologies typically use nitrogen balancing valves to dynamically adjust the inlet and outlet pressure difference, stabilizing the pressure inside the bladder at a set value to prevent defects such as blurred tread patterns, internal air bubbles, insufficient rubber, and uneven tire carcass density. However, the check valves used in existing vulcanization and shaping pipelines lack self-relief capabilities. Once the pressure in the pipeline exceeds the preset range, it needs to be relieved through the nitrogen balancing valve. Over time, this can damage the diaphragm of the nitrogen balancing valve, affecting its accuracy and lifespan.

[0020] Based on this, an exemplary embodiment of this application provides a pressure relief check valve and a vulcanization shaping pipe assembly for rubber tire vulcanization. The pressure relief check valve is provided with a first channel and a third channel connecting the valve cavity, and a second channel connecting the exhaust channel and the third channel on the valve stem. A first sealing element with a conical outer peripheral surface is provided, with the smaller diameter end of the first sealing element facing the air inlet channel. In this way, nitrogen entering through the air inlet channel can compress the conical outer peripheral surface of the first sealing element and enter the valve stem through the first channel, thereby realizing air intake. When air intake ends and the pressure in the pipe connected to the valve stem end is too high, nitrogen can flow back to the valve cavity through the first channel, and then sequentially through the third channel and the second channel before entering the exhaust channel. In this way, exhaust and pressure relief can be achieved through the exhaust channel without the need for pressure relief through the nitrogen balance valve, which will not affect the service life and accuracy of the nitrogen balance valve on the pipeline. Example 1:

[0021] An exemplary embodiment of this application provides a pressure relief check valve for vulcanizing rubber tires, such as... Figures 1 to 4 As shown, the pressure relief check valve includes a valve body 101, a valve stem 102, a first sealing element 103, and a stop component 104. The valve body 101 is hollow and open at one end. One end of the valve stem 102 is inserted into the valve body 101, forming a valve cavity 105 together with the valve body 101. The valve stem 102 and the valve body 101 are connected by fasteners. The valve stem 102 has a first channel 106 extending axially through it, a second channel 107 extending radially through it, and a third channel 108 connecting the valve cavity 105 and the second channel 107 axially. Preferably, there are multiple first channels 106 arranged around an axis. For example, there are four first channels 106 evenly distributed around the axis. The third channel 108 is located at the center of the valve stem 102 and connects the valve cavity 105 and the second channel 107 along the axial direction.

[0022] The first channel 106 is interconnected with the valve cavity 105; an air intake channel 109 is formed at the end of the valve body 101 away from the valve stem 102; the air intake channel 109 is interconnected with the valve cavity 105, and the cross-sectional dimension of the air intake channel 109 is smaller than the cross-sectional dimension of the valve cavity 105. A first seal 103 is disposed within the valve cavity 105; the axial dimension of the valve cavity 105 is larger than the axial thickness of the first seal 103, allowing the first seal 103 to move within the valve cavity 105 under air pressure. The first seal 103 has a tapered outer peripheral surface, with the smaller diameter end facing the air intake channel 109. A stop member 104 is disposed on the valve body 101, and an exhaust channel 110 is formed inside it.

[0023] Preferably, there are two second channels 107, which are perpendicular to each other and intersect at the center of the valve stem 102. The two second channels 107 are interconnected and both are connected to the third channel 108. An annular groove 114 is formed on the outer periphery of the valve stem 102. The second channels 107 are interconnected with the annular groove 114. In this way, when depressurization is performed through the valve, the gas that enters the valve stem 102 through the third channel 108 can enter the second channel 107 and be discharged through the exhaust channel 110 through the second channel 107 or the annular groove 114. This can increase the exhaust flow rate during the depressurization process and achieve rapid depressurization.

[0024] In the vulcanization process of rubber tires, pressure control is a core element in ensuring the tire's physical properties, structural integrity, and production safety. The vulcanizing tank or mold typically needs to maintain a stable pressure curve under high temperature and high pressure conditions. Any unexpected pressure fluctuations or reverse gas flow can lead to product quality defects or even safety accidents.

[0025] In this application, by setting a first sealing element 103, nitrogen gas entering through the air intake channel can compress the conical outer peripheral surface of the first sealing element 103 and enter the valve stem 102 through the first channel 106, thereby realizing air intake; when the air intake ends and the pressure in the pipe connected to the valve stem 102 is too high, nitrogen gas can flow back to the valve chamber 105 through the first channel 106, and then sequentially enter the exhaust channel 110 through the third channel 108 and the second channel 107, thereby venting and depressurizing, realizing unidirectional flow, reverse cut-off, and directional depressurization; ensuring the controllability of the depressurization process, preventing high-pressure gas from accidentally flowing back into the air intake system, and protecting other valves, sensors, and pipelines upstream from impact.

[0026] Meanwhile, the uniformity of tire vulcanization quality is highly dependent on the precise execution of the pressure curve. If a two-way flow valve is used, minute leaks or backflows may occur during pressure switching, causing pressure fluctuations within the valve cavity and affecting the accuracy and quality of vulcanization. In this application, the first seal 103 and the valve body 101 are interference-fitted. Furthermore, grease is provided between the first seal 103 and the valve body 101, creating a self-lubricating point that effectively reduces wear on the first seal 103 and extends its service life. The tight fit between the first seal 103 and the valve body 101 provides a more reliable seal, reduces pressure loss, and provides a stable pressure environment, thereby improving the quality of tire vulcanization.

[0027] For example, such as Figure 3 and 4 As shown, the first sealing element 103 includes a cylindrical sealing body 1031 and a conical sealing portion 1032 disposed on the outer periphery of the sealing body 1031; one end of the conical sealing portion 1032 is connected to one end of the sealing body 1031, and the other end is provided with an annular groove 1033 at a distance from the sealing body 1031. Thus, the first seal 103 not only provides a certain supporting effect, allowing for uniform intake of nitrogen gas without pressure loss, but also reacts quickly and releases pressure rapidly under depressurization conditions. The first seal 103 and the valve body 101 form a reliable seal, and the gas intake annular groove 1033 compresses the conical seal 1032, causing the conical seal 1032 to fit tightly against the inner wall of the valve body 101, forming a self-sealing effect. The higher the back pressure, the tighter the conical seal 1032 fits against the inner wall of the valve body 101, completely preventing the medium from flowing back and leaking from the intake channel 109. This allows for precise control of the depressurization process, adjustment of the depressurization rate, and maintenance of stable pressure during the vulcanization process.

[0028] The valve stem 102 has a protrusion at one end facing the valve body 101 towards the valve cavity 105. The protrusion can separate the end face of the first seal 103 from the end face of the valve stem 102, preventing the first seal 103 from blocking the first channel 106. Preferably, the protrusion is located at the center of the valve stem 102, and the third channel 108 passes through the protrusion.

[0029] Both the valve stem 102 and the valve body 101 are made of aluminum, which has good corrosion resistance, is easy to process, and can meet the requirements.

[0030] Thus, when air is introduced into the valve chamber 105 through the air intake channel 109, the first seal 103, near the protrusion, seals the third channel 108, preventing gas from entering the third channel 108, i.e., preventing exhaust. After entering the valve chamber 105, nitrogen gas can compress the conical sealing portion 1032 of the first seal 103 and enter the valve stem 102 through the first channel 106, and then enter the pipe connecting the valve stem 102 from inside the valve stem 102, thereby achieving air intake. When the air intake ends and the pressure inside the pipe connected to valve stem 102 is too high, nitrogen can flow back into valve chamber 105 through first channel 106. At this time, under the action of air pressure, first seal 103 moves towards air intake channel 109 and seals with valve body 101. Nitrogen entering valve chamber 105 passes through third channel 108 and second channel 107 in sequence and then enters exhaust channel 110. In this way, exhaust can be performed through exhaust channel 110 without the need for nitrogen balance valve, which will not affect the service life and accuracy of nitrogen balance valve on the pipeline.

[0031] For example, such as Figure 3 and 4 As shown, a first sealing groove 112 and a second sealing groove 113 are formed on both sides of the second channel 107, which surround the valve stem 102 in the circumferential direction; a sealing ring is provided in both the first sealing groove 112 and the second sealing groove 113, so that the sealing between the valve stem 102 and the valve body 101 can be achieved.

[0032] Preferably, the first seal 103 is made of high-temperature resistant rubber material, such as EPDM rubber or fluororubber. For example, peroxide-cured EPDM rubber can be used, which is resistant to high temperature, has extremely low compression set, and has good resilience under long-term pressure and high-temperature conditions. It will not lose its resilience due to long-term pressure, thus preventing seal failure and improving the life of the first seal 103.

[0033] Preferably, the end of the valve stem 102 away from the valve body 101 is recessed inward toward the valve body 101 to form a connecting groove 111 so as to connect the pipeline through the connecting flange. Example 2:

[0034] An exemplary embodiment of this application provides a vulcanized and shaped tube assembly, such as... Figure 5As shown, the vulcanization and shaping tube assembly includes the pressure relief check valve 10 for rubber tire vulcanization described in Example 1, as well as a filter 20, a nitrogen balance valve 30, and a three-way shut-off valve 40. One end of the filter 20 is connected to the air inlet pipe, and the other end is connected to the nitrogen balance valve 30. The other end of the nitrogen balance valve 30 is connected to the pressure relief check valve, and the other end of the pressure relief check valve is connected to the three-way shut-off valve 40. In this vulcanization and shaping tube assembly, when the gas pressure at the capsule end connected to the three-way shut-off valve 40 is higher than the conventional threshold, nitrogen can be discharged through the pressure relief check valve 10 to relieve pressure, without needing to relieve pressure through the nitrogen balance valve 30, thus not affecting the service life and accuracy of the nitrogen balance valve 30 on the pipeline.

[0035] The vulcanizing and shaping tube assembly in this application, by incorporating a pressure relief check valve 10, forms a dedicated pressure relief and exhaust channel. This allows for smoother and faster gas discharge when rapid cooling and depressurization are required at the end of the vulcanizing cycle, shortening the waiting time before mold opening. Simultaneously, due to the clearly defined airflow path, the control system can more accurately calculate the pressure relief rate, avoiding pressure residue caused by poor exhaust, optimizing the cycle time of the entire vulcanizing process, and improving production efficiency.

[0036] Experiments have shown Table 1 Test data of the pressure relief check valve of this application Table 2 Test data for comparison products Table 1 shows the test data for the two pressure relief check valves 10 of this application. 1# represents pressure relief check valve 10, and 2# represents pressure relief check valve 10. Port 1 represents the air inlet, port 2 represents the exhaust port of the first channel 106 on the valve stem 102, and port 3 represents the exhaust hole of the exhaust channel 110. Table 2 shows the test data for the quick exhaust valve. As can be seen from Tables 1 and 2 above, the pressure relief check valve 10 of this application has a pressure difference that is much smaller than that of other valves in the prior art when the inlet pressure is the same. The smaller the difference, the more sensitive the valve response and the higher the accuracy. Therefore, it can be shown that the test accuracy of the pressure relief check valve 10 of this application is much higher than that of valves in the prior art.

[0037] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the article or device that includes said element.

[0038] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0039] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and variations.

Claims

1. A pressure relief check valve for vulcanizing rubber tires, characterized in that, It includes a valve body (101), a valve stem (102), a first seal (103), and a stop component (104). One end of the valve stem (102) is inserted into the valve body (101), forming a valve cavity (105) together with the valve body (101); a first channel (106) is formed on the valve stem (102) that penetrates the valve stem (102) axially, a second channel (107) that penetrates the valve stem (102) radially, and a third channel (108) that connects the valve cavity (105) and the second channel (107) axially; the first channel (106) and the valve cavity (105) are interconnected. The valve body (101) forms an air intake channel (109) at one end away from the valve stem (102); the air intake channel (109) is in communication with the valve cavity (105); the first seal (103) is disposed in the valve cavity (105); the first seal (103) has a tapered outer peripheral surface, and the end with the smaller diameter is disposed toward the air intake channel (109); the stop member (104) is disposed on the valve body (101), and an exhaust channel (110) is formed inside it.

2. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, The first sealing element (103) includes a cylindrical sealing body (1031) and a conical sealing portion (1032) disposed on the outer periphery of the sealing body (1031); one end of the conical sealing portion (1032) is connected to one end of the sealing body (1031), and the other end is provided with an annular groove (1033) at a distance from the sealing body (1031).

3. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, There are multiple first channels (106), and multiple first channels (106) are arranged around the axis.

4. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, The second channel (107) has a first sealing groove (112) and a second sealing groove (113) formed on both sides, which surround the valve stem (102) in the circumferential direction; both the first sealing groove (112) and the second sealing groove (113) are provided with sealing rings.

5. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, The first seal (103) is made of high-temperature resistant rubber.

6. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, The valve stem (102) is recessed inward toward the valve body (101) at one end away from the valve body (101) to form a connecting groove (111).

7. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, The valve stem (102) has a protrusion at one end facing the valve body (101) toward the valve cavity, and the third channel (108) passes through the protrusion.

8. The pressure relief check valve for rubber tire vulcanization according to any one of claims 1 to 7, characterized in that, Both the valve stem (102) and the valve body (101) are made of aluminum.

9. The pressure relief check valve for rubber tire vulcanization according to claim 1, characterized in that, There are two second channels (107), and the two second channels (107) are perpendicular to each other; an annular groove (114) is formed on the outer periphery of the valve stem (102), and the second channels (107) are connected to the annular groove (114).

10. A vulcanized and shaped pipe assembly, characterized in that, Includes a pressure relief check valve (10) for vulcanizing rubber tires as described in any one of claims 1 to 9, as well as a filter (20), a nitrogen balance valve (30), and a three-way shut-off valve (40); one end of the filter (20) is connected to the air inlet pipe, and the other end is connected to the nitrogen balance valve (30); the other end of the nitrogen balance valve (30) is connected to the pressure relief check valve; the other end of the pressure relief check valve is connected to the three-way shut-off valve (40).

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