Valve element assembly of liquefied gas spray gun and pressure regulating valve of valve element assembly

Abstract

The utility model belongs to the technical field of liquefied gas spray gun accessories, and relates to a liquefied gas spray gun valve element assembly and a pressure regulating valve thereof, the liquefied gas spray gun valve element assembly comprises a valve rod, a valve bonnet and a sealing ring, the valve bonnet is sleeved at the upper end of the valve rod and is screwed and fixed with the valve rod, a sealing seat with a lower opening is arranged at the bottom of the valve bonnet, the sealing ring is embedded in a cavity of the sealing seat, and the sealing ring is arranged in the cavity of the sealing seat. A sealing ring is arranged on the upper portion of the valve rod, the sealing ring is connected with the bottom of the sealing ring in an abutting mode and tightly presses the sealing ring, the axial size of the sealing ring is larger than the axial size of the sealing seat, the radial size of the sealing ring is larger than the radial size of the sealing ring, and the exposed face of the sealing ring between the sealing ring and the sealing seat forms a sealing face. According to the valve element assembly of the liquefied gas spray gun and the pressure regulating valve of the valve element assembly, the pressure regulating stability can be improved, and the service life of the liquefied gas spray gun can be prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied gas spray gun accessories and relates to a valve core component of a liquefied gas spray gun and a pressure regulating valve thereof. Background Art

[0002] A liquefied gas flame torch is a heating tool that uses liquefied gas as fuel. When used correctly, it can reach temperatures of up to 1300°C. It is low-cost, safe, convenient, pollution-free, and offers stable performance. It is widely used in applications requiring flame or heating.

[0003] During use, a liquefied gas flamethrower requires a pressure-regulating valve to adjust the flame size. This pressure regulation works by varying the flow rate through the movement of a valve core. Existing liquefied gas flamethrowers typically utilize a valve stem and a sealing ring. The sealing ring fits onto the valve stem through a mounting groove on the stem and moves with the stem. Over time, the sealing ring can deform and age due to repeated compression, friction, and reaction with the liquefied gas in high-temperature environments, compromising the proper function of the liquefied gas flamethrower. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a valve core assembly of a liquefied gas spray gun and a pressure regulating valve thereof, which can improve the stability of pressure regulation and extend the service life of the liquefied gas spray gun.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A valve core assembly for a liquefied gas spray gun includes a valve stem, a valve bonnet and a sealing ring. The valve bonnet is sleeved on the upper end of the valve stem and screwed thereto. A sealing seat with a lower opening is provided at the bottom of the valve bonnet. The sealing ring is embedded in the cavity of the sealing seat. A sealing ring is provided on the upper part of the valve stem. The sealing ring is in contact with and pressed against the bottom of the sealing ring. The axial dimension of the sealing ring is greater than the axial dimension of the sealing seat, and the radial dimension is greater than the radial dimension of the sealing ring. The exposed surface of the sealing ring between the sealing ring and the sealing seat forms a sealing surface.

[0007] In the above-mentioned valve core assembly of a liquefied gas spray gun, preferably, the valve stem, valve bonnet, sealing ring, sealing seat and sealing ring are coaxially arranged, and the radial dimensions of the valve stem, valve bonnet, sealing ring, sealing ring and sealing seat increase sequentially.

[0008] In the above-mentioned valve core assembly of a liquefied gas spray gun, the upper end face of the sealing ring has an interference fit with the top of the inner cavity of the sealing seat, the outer ring surface has an interference fit with the inner cavity side wall of the sealing seat, the inner ring surface has an interference fit with the outer peripheral surface of the valve stem, and the lower end face has an interference fit with the upper end face of the sealing ring.

[0009] In the valve core assembly of the liquefied gas spray gun described above, the valve stem and the valve cap are made of copper material, and the sealing ring is made of rubber material.

[0010] In the valve core assembly of the liquefied gas spray gun described above, the valve cap and the sealing seat are integrally formed, and the valve stem and the sealing ring are integrally formed.

[0011] Another object of the present invention is to provide a pressure regulating valve for a liquefied gas spray gun, wherein any one of the above-mentioned valve core components is assembled in the pressure regulating valve.

[0012] In the above-mentioned pressure regulating valve of a liquefied gas spray gun, the pressure regulating valve includes a main body, and an air inlet chamber and an air outlet chamber distributed along the axial direction are provided at both ends of the main body, and a pressure regulating chamber and an ignition chamber distributed along the radial direction are provided above the main body. The connection state between the air inlet chamber and the pressure regulating chamber is controlled by a main control knob, and the connection state between the pressure regulating chamber and the air outlet chamber is controlled by the valve core assembly. The pressure regulating chamber and the ignition chamber are always connected, and the connection state between the ignition chamber and the air outlet chamber is controlled by the ignition knob.

[0013] In the above-mentioned pressure regulating valve of a liquefied gas spray gun, the valve core assembly slides radially in the main body, a valve core spring is provided in the pressure regulating chamber to drive the valve core assembly to move downward, the lower end of the valve stem passes through the main body and is connected in contact with the pressure regulating handle, one end of the pressure regulating handle is hinged to the main body and drives the valve core assembly to move upward; further, the upper end of the valve core spring is connected in contact with the top of the pressure regulating chamber, and the lower end is mounted on the valve cap and is connected in contact with the top of the sealing seat.

[0014] In the above-mentioned pressure regulating valve of a liquefied gas spray gun, a conical surface is provided at the bottom of the pressure regulating chamber, and the sealing surface of the valve core assembly cooperates with the conical surface to adjust the gap between the valve core assembly and the bottom opening of the pressure regulating chamber. In the initial state, the valve core spring drives the sealing surface of the valve core assembly to be sealed and connected with the conical surface.

[0015] In the above-mentioned pressure regulating valve of a liquefied gas spray gun, the main control knob is screwed into the control chamber, the bottom of the control chamber is connected to the air intake chamber, and the side is connected to the pressure regulating chamber, and the bottom of the main control knob is provided with a tapered end for adjusting the opening gap at the bottom of the control chamber; the ignition knob is screwed into the ignition chamber, and the bottom of the ignition knob is provided with a tapered end for adjusting the opening gap at the bottom of the ignition chamber.

[0016] In the above-mentioned pressure regulating valve of a liquefied gas spray gun, a first channel connecting the control chamber and the pressure regulating chamber, and a second channel connecting the pressure regulating chamber and the ignition chamber are provided in the main body. The first channel is arranged obliquely upward along the flow direction of the gas, and the second channel is arranged obliquely downward along the flow direction of the gas.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a valve core assembly for a liquefied gas spray gun. The valve core assembly is formed by a valve stem, a valve cap, and a sealing ring. The sealing seat on the valve cap and the sealing ring on the valve stem together form a fixed structure for the sealing ring, which provides a more stable structure. Furthermore, the sealing ring is always restrained within the sealing seat, preventing deformation that could affect the pressure regulation effect. Thus, the present invention provides a more stable valve core assembly, achieving a more stable pressure regulation gap and pressure regulation effect, thereby extending the service life of the liquefied gas spray gun.

[0019] 2. The utility model provides a pressure regulating valve for a liquefied gas spray gun. Through the joint setting of multiple cavities, it can realize the total adjustment of the ventilation volume, the ignition adjustment of the ventilation volume, and the use adjustment of the ventilation volume. Therefore, the ventilation volume of the liquefied gas spray gun can be adjusted more finely according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a perspective view of embodiment 1 of the present utility model;

[0021] Figure 2 This is an axial cross-sectional view of Example 1 of the present utility model;

[0022] Figure 3 This is an exploded view of Example 1 of the present utility model;

[0023] Figure 4 It is a perspective view of embodiment 2 of the present utility model;

[0024] Figure 5 This is an axial cross-sectional view of Example 2 of the present utility model;

[0025] Figure 6 This is a radial cross-sectional view of Example 2 of the present utility model;

[0026] Figure markings: 1. Valve stem; 2. Valve cap; 3. Sealing ring; 4. Sealing seat; 5. Sealing ring; 6. Main body; 7. Air inlet chamber; 8. Air outlet chamber; 9. Pressure regulating chamber; 10. Ignition chamber; 11. Main control knob; 12. Ignition knob; 13. Valve core spring; 14. Pressure regulating handle; 15. Control chamber; 16. First channel; 17. Second channel. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to specific embodiments of the present invention. Figure 1-6 :

[0028] Example 1

[0029] Compare with Figure 1 To the attached Figure 3A valve core assembly of a liquefied gas spray gun includes a valve stem 1, a valve cap 2 and a sealing ring 3. The valve cap 2 is sleeved on the upper end of the valve stem 1 and screwed thereto. A sealing seat 4 with a lower opening is provided at the bottom of the valve cap 2. The sealing ring 3 is embedded in the cavity of the sealing seat 4. A sealing ring 5 is provided on the upper part of the valve stem 1. The sealing ring 5 is in contact with the bottom of the sealing ring 3 and presses the sealing ring 3. The axial dimension of the sealing ring 3 is larger than the axial dimension of the sealing seat 4, and the radial dimension is larger than the radial dimension of the sealing ring 5. The exposed surface of the sealing ring 3 between the sealing ring 5 and the sealing seat 4 forms a sealing surface.

[0030] When in use, first place the sealing ring 3 into the sealing seat 4 of the valve bonnet 2, then pass the external thread part of the upper end of the valve stem 1 through the sealing ring 3 and screw it to the internal thread of the valve bonnet 2. When screwing, the sealing ring 5 moves with the valve stem 1 toward the valve bonnet 2. After the screwing is completed, the sealing ring 5 presses the sealing ring 3 to form the valve core assembly of the liquefied gas spray gun.

[0031] After assembly, the upper end face of the sealing ring 3 has an interference fit with the top of the inner cavity of the sealing seat 4, the outer ring surface has an interference fit with the inner cavity side wall of the sealing seat 4, the inner ring surface has an interference fit with the outer peripheral surface of the valve stem 1, and the lower end face has an interference fit with the upper end face of the sealing ring 5.

[0032] Preferably, the valve stem 1, valve bonnet 2, sealing ring 5, sealing seat 4 and sealing ring 3 are coaxially arranged, and the radial dimensions of the valve stem 1, valve bonnet 2, sealing ring 5, sealing ring 3 and sealing seat 4 increase in sequence.

[0033] In this embodiment, the valve stem 1 and the valve cap 2 are made of copper, and the sealing ring 3 is made of rubber. Furthermore, the valve cap 2 and the sealing seat 4 are integrally formed, and the valve stem 1 and the sealing ring 5 are integrally formed.

[0034] Example 2

[0035] Compare with Figure 4 To the attached Figure 6 , a pressure-regulating valve for a liquefied gas spray gun, the pressure-regulating valve being equipped with the valve core assembly of Example 1, specifically: the pressure-regulating valve comprises a main body 6, an air inlet chamber 7 and an air outlet chamber 8 distributed along the axial direction are provided at both ends of the main body 6, a pressure-regulating chamber 9 and an ignition chamber 10 distributed along the radial direction are provided above the main body 6, the communication state between the air inlet chamber 7 and the pressure-regulating chamber 9 is controlled by a main control knob 11, the communication state between the pressure-regulating chamber 9 and the air outlet chamber 8 is controlled by the valve core assembly, the pressure-regulating chamber 9 and the ignition chamber 10 are always connected, and the communication state between the ignition chamber 10 and the air outlet chamber 8 is controlled by an ignition knob 12.

[0036] The pressure regulation process of this embodiment is as follows: in the ignition state, the valve core assembly closes the passage between the pressure regulating chamber 9 and the air outlet chamber 8, and the liquefied gas enters the main body 6 from the air inlet chamber 7, then enters the pressure regulating chamber 9, then enters the ignition chamber 10 from the pressure regulating chamber 9, and finally enters the air outlet chamber 8 from the ignition chamber 10. In the ignition state, the ignition passage is in a normally open state, and its ventilation volume is small, which is only used for ignition and maintaining the flame of the liquefied gas spray gun. In the use state, the liquefied gas enters the main body 6 from the air inlet chamber 7, then enters the pressure regulating chamber 9, and then directly enters the air outlet chamber 8 from the pressure regulating chamber 9. The ventilation volume is adjusted by adjusting the gap between the pressure regulating chamber 9 and the air outlet chamber 8 by the valve core assembly, thereby controlling the size of the firepower. In the use state, the ignition passage is still in a normally open state, but its ventilation volume is much smaller than the ventilation volume when the pressure regulating chamber 9 directly enters the air outlet chamber 8, so it has little effect on the size of the firepower.

[0037] The specific assembly structure of the valve core assembly of this embodiment is as follows: the valve core assembly slides radially within the main body 6, a valve core spring 13 is provided within the pressure regulating chamber 9 to drive the valve core assembly downward, the lower end of the valve stem 1 passes through the main body 6 and is in contact with a pressure regulating handle 14, one end of which is hinged to the main body 6 and drives the valve core assembly upward. Furthermore, the upper end of the valve core spring 13 is in contact with the top of the pressure regulating chamber 9, while the lower end is sleeved on the valve cap 2 and in contact with the top of the sealing seat 4. During use, by controlling the degree of pressure on the pressure regulating handle 14, the relative position of the valve core assembly, and thus the amount of ventilation, can be controlled.

[0038] Preferably, a conical surface is provided at the bottom of the pressure regulating chamber 9, and the sealing surface of the valve core assembly cooperates with the conical surface to adjust the gap between the valve core assembly and the bottom opening of the pressure regulating chamber 9. In the initial state, the valve core spring 13 drives the sealing surface of the valve core assembly to be sealed and connected with the conical surface; through the cooperation of the sealing surface and the conical surface, the ventilation volume can be adjusted more finely, and the sealing effect in the initial state can also be made better.

[0039] Furthermore, the main control knob 11 is screwed into the control chamber 15, the bottom of the control chamber 15 is connected to the air intake chamber 7, and the side is connected to the pressure regulating chamber 9, and the bottom of the main control knob 11 is provided with a conical end for adjusting the opening gap at the bottom of the control chamber 15; the ignition knob 12 is screwed into the ignition chamber 10, and the bottom of the ignition knob 12 is provided with a conical end for adjusting the opening gap at the bottom of the ignition chamber 10.

[0040] Furthermore, a first channel 16 connecting the control chamber 15 and the pressure regulating chamber 9, and a second channel 17 connecting the pressure regulating chamber 9 and the ignition chamber 10 are provided in the main body 6. The first channel 16 is arranged upwardly and tilted along the flow direction of the gas, and the second channel 17 is arranged downwardly and tilted along the flow direction of the gas.

[0041] By rotating the main control knob 11, its tapered end moves, and the gap between the bottom opening of the control chamber 15 and the tapered end of the main control knob 11 changes accordingly, and the ventilation volume of the air inlet chamber 7 entering the control chamber 15 also changes accordingly. Since any air outlet channel is limited by the ventilation volume of the control chamber 15, when the ventilation volume of the control chamber 15 changes, the change of the overall ventilation volume can be controlled. When the main control knob 11 is rotated to the bottom, the air outlet channel of the entire liquefied gas spray gun can be closed.

[0042] By rotating the ignition knob 12, its tapered end moves, and the gap between the bottom opening of the ignition chamber 10 and the tapered end of the ignition knob 12 changes accordingly, and the ventilation volume of the ignition chamber 10 entering the air outlet chamber 8 also changes accordingly. Therefore, the ventilation volume during ignition can be controlled by the ignition knob 12. When the ignition knob 12 is rotated to the bottom, the ignition channel can be closed.

[0043] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve core assembly for a liquefied gas spray gun, characterized in that: The valve stem (1) comprises a valve cap (2) and a sealing ring (3), wherein the valve cap (2) is mounted on the upper end of the valve stem (1) and is screwed thereto, a sealing seat (4) with a lower opening is provided at the bottom of the valve cap (2), and the sealing ring (3) is embedded in the cavity of the sealing seat (4), and a sealing ring (5) is provided at the upper part of the valve stem (1), wherein the sealing ring (5) is in contact with the bottom of the sealing ring (3) and presses the sealing ring (3), wherein the axial dimension of the sealing ring (3) is greater than the axial dimension of the sealing seat (4), and the radial dimension is greater than the radial dimension of the sealing ring (5), and the exposed surface of the sealing ring (3) between the sealing ring (5) and the sealing seat (4) forms a sealing surface.

2. The valve core assembly of a liquefied gas spray gun according to claim 1, characterized in that: The valve stem (1), valve bonnet (2), sealing ring (5), sealing seat (4) and sealing ring (3) are coaxially arranged, and the radial dimensions of the valve stem (1), valve bonnet (2), sealing ring (5), sealing ring (3) and sealing seat (4) increase in sequence.

3. The valve core assembly of a liquefied gas spray gun according to claim 1, characterized in that: The upper end face of the sealing ring (3) is interference fit with the top of the inner cavity of the sealing seat (4), the outer ring face is interference fit with the inner cavity side wall of the sealing seat (4), the inner ring face is interference fit with the outer peripheral surface of the valve stem (1), and the lower end face is interference fit with the upper end face of the sealing ring (5).

4. A pressure regulating valve for a liquefied gas spray gun, characterized in that: The pressure regulating valve is equipped with the valve core assembly according to any one of claims 1 to 3.

5. The pressure regulating valve for a liquefied gas spray gun according to claim 4, characterized in that: The pressure regulating valve comprises a main body (6), wherein both ends of the main body (6) are provided with an air inlet chamber (7) and an air outlet chamber (8) distributed in the axial direction, and a pressure regulating chamber (9) and an ignition chamber (10) are provided above the main body (6) and distributed in the radial direction, wherein the communication state between the air inlet chamber (7) and the pressure regulating chamber (9) is controlled by a main control knob (11), and the communication state between the pressure regulating chamber (9) and the air outlet chamber (8) is controlled by the valve core assembly, the pressure regulating chamber (9) and the ignition chamber (10) are always connected, and the communication state between the ignition chamber (10) and the air outlet chamber (8) is controlled by an ignition knob (12).

6. The pressure regulating valve for a liquefied gas spray gun according to claim 5, characterized in that: The valve core assembly slides radially in the main body (6), and a valve core spring (13) is provided in the pressure regulating chamber (9) to drive the valve core assembly to move downward. The lower end of the valve stem (1) passes through the main body (6) and is in contact with the pressure regulating handle (14). One end of the pressure regulating handle (14) is hinged to the main body (6) and drives the valve core assembly to move upward.

7. The pressure regulating valve for a liquefied gas spray gun according to claim 6, characterized in that: The bottom of the pressure regulating chamber (9) is provided with a conical surface, and the sealing surface of the valve core assembly cooperates with the conical surface to adjust the gap between the valve core assembly and the bottom opening of the pressure regulating chamber (9). In the initial state, the valve core spring (13) drives the sealing surface of the valve core assembly to be sealed and connected with the conical surface.

8. The pressure regulating valve for a liquefied gas spray gun according to claim 5, characterized in that: The master control knob (11) is screwed into the control chamber (15), the bottom of the control chamber (15) is communicated with the air intake chamber (7), and the side is communicated with the pressure regulating chamber (9), and the bottom of the master control knob (11) is provided with a tapered end for adjusting the gap of the bottom opening of the control chamber (15); the ignition knob (12) is screwed into the ignition chamber (10), and the bottom of the ignition knob (12) is provided with a tapered end for adjusting the gap of the bottom opening of the ignition chamber (10).

9. The pressure regulating valve for a liquefied gas spray gun according to claim 8, characterized in that: The main body (6) is provided with a first channel (16) connecting the control chamber (15) and the pressure regulating chamber (9), and a second channel (17) connecting the pressure regulating chamber (9) and the ignition chamber (10). The first channel (16) is arranged obliquely upward along the flow direction of the gas, and the second channel (17) is arranged obliquely downward along the flow direction of the gas.

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