Pressure release valve for coffee machine and coffee machine with pressure release valve

Abstract

The invention relates to a pressure release valve for a coffee machine and the coffee machine thereof, and relates to the technical field of pressure release valve structures, the pressure release valve comprises a valve body, a first connector communicated with the outside and a second connector communicated with a waterway system are arranged on the valve body, a valve element, a valve rod and a spring are arranged in the valve body, the valve element is located on one side of the first connector, and the valve rod is located below the valve element; one end of the spring abuts against the upper portion of the valve body, the other end of the spring abuts against the valve element, and when the waterway system is in three different pressure states, the position state between the valve rod and the valve element controls whether the waterway system is communicated with the outside atmosphere or not. According to the pressure release valve for the coffee machine and the coffee machine, the application problem that a low-pressure exhaust mechanism and an overload pressure release mechanism need to be arranged in a water path of a current coffee machine water path system, and consequently the overall structure is complex can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure relief valve structures, and in particular to a pressure relief valve for a coffee machine and a coffee machine thereof. Background Art

[0002] During the low-pressure water replenishment stage of the water circuit system of a coffee machine, when the water circuit is in a completely sealed state, the water pump needs to draw water from the water tank to the heating module through negative pressure. At this time, the vacuum resistance formed in the closed pipeline will significantly increase the load of the water pump, resulting in a decrease in the water replenishment efficiency or even problems such as intermittent water flow, affecting the stability of coffee making. At the same time, if the pressure of the water circuit system abnormally increases due to reasons such as heating expansion, pipeline blockage, or solenoid valve failure, exceeding the material tolerance threshold, it may cause safety hazards such as pipeline rupture and seal failure. In the light case, it leaks and damages the equipment, and in the serious case, high-temperature and high-pressure steam splashes, causing a risk of scalding. To address these two types of problems, traditional designs often require separately setting an independent low-pressure exhaust valve and an overload pressure relief valve in the water circuit: the former discharges the gas in the pipeline in the low-pressure stage to eliminate the negative pressure resistance, and the latter quickly relieves pressure in the high-pressure stage to ensure safety. However, the dual-valve separate layout not only increases the complexity of the water circuit structure, that is, additional interfaces, seals, and assembly processes are required, but also leads to redundant control logic and rising maintenance costs. Moreover, due to the collaborative errors of multiple components, the system reliability may be reduced, which is not conducive to the further structural compactness of the coffee machine. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the present invention provides a pressure relief valve for a coffee machine and a coffee machine thereof, which can solve the application problem that the current water circuit system of the coffee machine needs to separately set a low-pressure exhaust and an overload pressure relief mechanism in the water circuit, resulting in a complex overall structure.

[0004] To achieve this purpose, the present invention adopts the following technical solutions: A pressure relief valve for a coffee machine provided by the present invention includes a valve body, on which a first joint communicating with the outside atmosphere and a second joint communicating with the water circuit system are provided; a valve core, a valve rod, and a spring are arranged inside the valve body. The valve core is located on one side of the first joint, the valve rod is located below the valve core and on one side of the second joint. One end of the spring abuts against the upper part of the valve body, and the other end of the spring abuts against the valve core. When the water circuit system is below the first pressure relief pressure, the valve rod and the valve core are separated from each other, forming a first pressure relief channel, so that the water circuit system is communicated with the outside atmosphere. When the water circuit system is between the first pressure relief pressure and the second pressure relief pressure, the valve rod and the valve core are in contact with each other, so that the water circuit system is isolated from the atmospheric pressure. When the water circuit system is above the second pressure relief pressure, the valve rod jacks up the valve core, forming a second pressure relief channel, so that the water circuit system is communicated with the outside atmosphere.

[0005] The preferred technical solution of the present invention is that the valve body includes an upper chamber and a lower chamber, the valve core is located in the upper chamber, the valve stem is located in the lower chamber, and a limiting portion is provided between the upper chamber and the lower chamber to prevent the valve core from moving into the lower chamber.

[0006] A preferred technical solution of the present invention is that a valve core sealing ring is provided between the valve core and the inside of the valve body.

[0007] A preferred technical solution of the present invention is that the middle portion of the valve core is in a communicating structure, and the rod body of the valve stem passes through the middle portion of the valve core.

[0008] A preferred technical solution of the present invention is that the upper cross-section of the valve stem is a regular polygon, the inner cross-section of the valve core is a circle, and the number of sides of the regular polygon is 3-6.

[0009] A preferred technical solution of the present invention is that an arc-shaped air passage groove is provided at the lower part of the valve stem.

[0010] The preferred technical solution of the present invention is that a valve stem sealing ring is sleeved on the rod body of the valve stem.

[0011] The preferred technical solution of the present invention is that an axially movable valve cover is provided on the upper part of the valve body, one end of the spring abuts against the bottom of the valve cover, and the other end of the spring abuts against the valve core.

[0012] A preferred technical solution of the present invention is that the valve cover and the valve body are threadedly connected.

[0013] The present invention provides a coffee machine, comprising the pressure relief valve of the above technical solution.

[0014] Beneficial effects of the present invention: The present invention proposes a pressure relief valve for a coffee machine and the coffee machine thereof. The pressure relief valve organically integrates the two functions of low-pressure exhaust and overload pressure relief into a single device, and its core lies in the synergistic mechanism of the valve body, valve core, valve stem and spring. Below the first pressure relief pressure, the water system is discharged at low pressure through the path of the second joint → valve body inner cavity → first joint. When the system pressure rises to the interval between the first pressure relief pressure and the second pressure relief pressure, the valve stem moves up under the pressure to form a sealed contact with the bottom of the valve core, blocking the water system and the atmospheric passage. When the pressure exceeds the second pressure relief pressure, the upward force generated inside completely overcomes the spring pressure and the deadweight of the valve stem, pushing the valve core to move up as a whole and away from the inner surface of the valve body, forming a new second pressure relief channel between the outer periphery of the valve core and the inner wall of the valve body, and realizing the rapid discharge of high-pressure gas. This stepped pressure response mechanism creatively integrates the pressure relief requirements of two different pressure thresholds into an integral mechanism through the linear compression characteristics of a single spring and the differential coordination of the valve core and the valve stem, effectively solving the application problem that the current coffee machine water system requires the installation of low-pressure exhaust and overload pressure relief mechanisms in the water circuit respectively, resulting in a complex overall structure. Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Is a perspective view of a pressure relief valve for a coffee machine according to Embodiment 1 of the present invention; Figure 2 Is a top view of a pressure relief valve for a coffee machine according to Embodiment 1 of the present invention; Figure 3 Is an exploded view of a pressure relief valve for a coffee machine according to Embodiment 1 of the present invention; Figure 4 Under the low-pressure system Figure 2 Is a sectional view along the A-A direction and a gas flow schematic diagram; Figure 5 Under the medium-pressure system Figure 2 Is a sectional view along the A-A direction and a gas flow schematic diagram; Figure 6 Under the high-pressure system Figure 2 Is a sectional view along the A-A direction and a gas flow schematic diagram; Figure 7 Is a perspective view of the valve body according to Embodiment 1 of the present invention; Figure 8 Is a perspective view of the valve core according to Embodiment 1 of the present invention; Figure 9 Is a perspective view of the valve stem according to Embodiment 1 of the present invention; Figure 10 Is a front view of the valve stem according to Embodiment 2 of the present invention; Figure 11 Is a perspective view of the valve stem according to Embodiment 2 of the present invention; Figure 12 Is a top view of the combination of the valve stem and the valve core according to Embodiment 2 of the present invention.

[0017] In the figure: 1-valve body; 11-first joint; 12-second joint; 13-upper chamber; 14-lower chamber; 2-valve core; 3-valve stem; 31-rod body; 32-air passage groove; 4-spring; 5-valve core sealing ring; 6-valve stem sealing ring; 7-valve cover. Detailed Embodiments

[0018] The following will further illustrate the technical solutions of the present invention in conjunction with the drawings and through specific embodiments.

[0019] Example 1 A pressure relief valve for a coffee machine provided in this embodiment is as Figures 1-9 shown, and includes a valve body 1. A first joint 11 communicating with the outside atmosphere and a second joint 12 communicating with a water circuit system are provided on the valve body 1. A valve core 2, a valve stem 3, and a spring 4 are provided inside the valve body 1. The valve core 2 is located on one side of the first joint 11, and the valve core 2 is restricted in the upper region inside the valve body. The valve stem 3 is located below the valve core 2 and on one side of the second joint 12. The valve stem 3 vertically drops under the action of gravity and disengages from contact with the valve core 2. One end of the spring 4 abuts against the upper part of the valve body 1, and the other end of the spring 4 abuts against the valve core 2. When the water system is below the first pressure relief pressure, since the valve core 2 is limited to the upper area in the valve body and the valve stem 3 falls vertically under the action of gravity, the valve stem 3 and the valve core 2 are separated to form a first pressure relief channel, so that the water system is connected to the outside atmosphere. When the water system is between the first pressure relief pressure and the second pressure relief pressure, the valve stem 3 and the valve core 2 fit together, so that the water system is isolated from the atmospheric pressure. When the water system is above the second pressure relief pressure, the valve stem 3 is close to and lifts up the valve core 2 to form a second pressure relief channel, so that the water system is connected to the outside atmosphere. The technical solution of this embodiment integrates the two functions of low-pressure exhaust and overload pressure relief into a single device through the innovative design of the internal structure of the valve body. Its core lies in the synergistic mechanism of the valve body, valve core, valve stem and spring. The valve body is a functional carrier. The first joint is directly connected to the atmosphere, and the second joint forms a pressure transmission interface with the water system. The two realize pressure interaction through the inner cavity of the valve body. The valve core is the first core actuator of pressure response. Its position is controlled by both spring pressure and system pressure: the upper end of the spring is in rigid contact with the top of the valve body, and the lower end exerts continuous downward pressure on the valve core, which constitutes the mechanical balance basis of the initial state of the structure. The valve stem is set on the side close to the water system below the valve core. The valve stem is the second core actuator of pressure response. Its position is controlled by both its own gravity and system pressure. The shape of its top end forms a complementary contact surface with the bottom of the valve core. The state of the two determines the opening and closing state of the pressure channel. In the low-pressure stage (below the first pressure relief pressure), the water system pressure is not enough to overcome the gravity of the valve stem. At this time, the valve core remains in a high position, and a gap is formed between the top of the valve stem and the bottom of the valve core, forming the first pressure relief channel, so that the gas in the water system can be discharged at low pressure through the path of the second joint → the inner cavity of the valve body → the first joint. When the system pressure rises to the medium pressure stage (the first pressure relief pressure and the second pressure relief pressure interval), the valve stem moves upward under the pressure of the water system and forms a sealed contact with the bottom of the valve core, forming a valve stem and valve core matching body, blocking the water system and the atmospheric channel, but at this time the spring compression remains unchanged to maintain the overall seal, and the system enters a normal working state. When the pressure of the water system rises to the high pressure stage (exceeding the second pressure relief pressure), the upward force generated inside completely overcomes the spring pressure and the deadweight of the valve stem and other components, and the valve stem and valve core are lifted up together, pushing the valve core as a whole to move up and away from the inner surface of the valve body, thereby forming a second pressure relief channel and realizing the rapid release of high-pressure gas. This stepped pressure response mechanism creatively integrates the pressure relief requirements of two different pressure thresholds into a continuous action process through the linear compression characteristics of a single spring, the differential coordination of the valve core-valve stem, and the spatial layout of the valve body flow channel, which not only ensures the precise exhaust requirements in the low pressure stage, but also meets the safety protection requirements during high pressure overload, significantly improving the functional integration and working condition adaptability of the pressure relief device.

[0020] Preferably, the valve body 1 includes an upper chamber 13 and a lower chamber 14. The valve core 2 is located in the upper chamber 13, and the valve stem 3 is located in the lower chamber 14. A limiting portion is provided between the upper chamber 13 and the lower chamber 14 to prevent the valve core 2 from moving into the lower chamber 14. In this embodiment, a narrowing structure from top to bottom is provided between the upper chamber 13 and the lower chamber 14, thereby playing a role in limiting the valve core. The interior of the valve body is divided into an upper chamber and a lower chamber, and the movement areas of the valve core and the valve stem are isolated by the limiting portion. This structural innovation significantly improves the accuracy and reliability of the pressure relief action. The upper chamber serves as an independent movement space for the valve core, which can avoid the interference of impurities in the water circuit system on the movement trajectory of the valve core. The lower chamber directly senses the pressure change of the water circuit system through the valve stem, forming a modular control of pressure zones. In addition, the chamber-dividing design optimizes the hydrodynamic characteristics. The communication path between the upper chamber and the first joint is shortened, accelerating the low-pressure exhaust efficiency. The lower chamber is directly connected to the water circuit through the second joint, reducing the pressure transmission lag and making the system response more sensitive. This design reduces the risk of linkage interference between the valve core and the valve stem through physical isolation and functional partitioning, while improving the stability of the pressure relief threshold.

[0021] Preferably, a valve core sealing ring 5 is provided between the valve core 2 and the interior of the valve body 1. In this embodiment, the valve core sealing ring 5 is sleeved on the valve core 2. Adding a valve core sealing ring between the valve core and the inner wall of the valve body is the key improvement to solve the internal leakage problem of traditional pressure relief valves. During the low-pressure exhaust stage, the elastic fit between the valve core sealing ring and the valve body can block the unexpected leakage of other paths, so that the fluid is discharged through the originally designed first pressure relief channel. During the high-pressure pressure relief stage, the valve core sealing ring is lifted with the valve core, so that the sealing effect is released and the second pressure relief channel is opened. The material of the valve core sealing ring can be selected from fluororubber or silica gel, which needs to take into account high temperature resistance and elastic modulus to adapt to the frequent thermal cycle working conditions of the coffee machine. It should be noted that a similar structure can also be provided inside the valve body 1 for the valve core sealing ring 5 to be sleeved on, rather than on the valve core 2, so as to achieve the sealing between the valve core 2 and the valve body 1.

[0022] Preferably, the middle part of the valve core 2 is of a communicating structure, and the rod body 31 of the valve stem 3 penetrates through the middle part of the valve core 2. The through-flow channel in the middle of the valve core and the penetration fit of the valve stem reconstruct the pressure transmission path and the mechanical linkage logic. In the traditional design, the split structure of the valve core and the valve stem requires a complex lever to transmit displacement. In this solution, the valve stem directly penetrates through the middle of the valve core, converting the upward thrust of the water circuit pressure on the valve stem into the axial displacement of the valve core, greatly simplifying the force transmission chain. The communicating structure of the valve core enables the pressure in the lower chamber to directly act on the bottom of the valve core through the hollow channel, directly opposing the spring pressure and eliminating the force loss in the intermediate link. This design not only improves the sensitivity of the response action, but also reduces the number of parts through structural integration, reducing the failure rate.

[0023] Furthermore, a valve stem seal ring 6 is sleeved on the rod body 31 of the valve stem 3. The valve stem seal ring is sleeved on the valve stem rod body, and its function is a combination of dynamic sealing and guiding functions. When the valve stem moves up and down with the change of pressure, the valve stem seal ring keeps close contact with the inner wall of the valve body, blocking the cross-leakage between the lower chamber and the upper chamber, and ensuring the independence of the pressure sensing signal. At the same time, the radial pre-tightening force of the seal ring plays a self-centering role on the valve stem, maintaining the stability of use. Supplementary note: A similar structure can also be set inside the valve core 2 for the valve core seal ring 5 to be sleeved on it, rather than on the valve stem 3, so as to achieve the seal between the valve core 2 and the valve body 1.

[0024] Preferably, an arc-shaped air passage groove 32 is provided at the lower part of the valve stem 3. By providing an arc-shaped air passage groove at the lower part of the valve stem, the systematic improvement of the pressure relief performance is achieved. This innovative design significantly improves the air flow through characteristics through a streamlined structure. The continuous curvature transition of the arc-shaped groove effectively avoids the common air flow peeling phenomenon of traditional right-angle grooves, making the gas flow smoother and more stable. During the pressure relief process, the arc-shaped structure can guide the pressure wave to spread evenly, prevent local overpressure from impacting the sealing surface, and at the same time improve the overall pressure relief efficiency.

[0025] Preferably, a valve cover 7 that can move axially is provided at the upper part of the valve body 1. One end of the spring 4 abuts against the bottom of the valve cover 7, and the other end of the spring 4 abuts against the valve core 2. An axial adjustment structure is adopted between the valve cover and the valve body, so that the spring pressure of the valve body can be adjusted. During production, the corresponding pressure relief parameters can be determined according to the actual spring structure parameters used and the internal structure parameters of the valve body. This design enables the same valve body to quickly adapt to the pressure requirements of multiple coffee machine models by adapting different specifications of springs or adjusting the position of the valve cover, significantly improving the versatility of parts. The adjustable valve cover also simplifies the maintenance process. Users can complete the pressure calibration without disassembling the entire valve body, reducing after-sales costs. Further, the valve cover 7 and the valve body 1 are threadedly connected. This solution is simple and direct. By rotating the valve cover to change its screwing depth with the valve body, the initial compression amount of the spring can be accurately adjusted, so as to flexibly set the pressure relief parameters.

[0026] According to the technical solutions of the above embodiments, the parameter design of its pressure relief calculation is briefly described below. The creo modeling design is used: Requirements: Pressure relief of 3 ± 0.5 bar (ignoring friction), exhaust sealing pressure of 0.1 bar, that is, the exhaust function is closed at 0.1 bar.

[0027] Valve stem: Material is copper H59, weight is 1.9 g; Valve stem seal ring: Material is fluororubber, weight is 0.1 g; Valve core: Material is copper H59, weight is 5.2 g; Valve core seal ring: Material is fluororubber, weight is 0.2 g; S (cross-sectional stress area of the valve stem in the low-pressure stage) = 8 mm²; S (sum of cross-sectional force-bearing areas of valve stem and valve core assembly in medium-pressure stage) = 65 mm²; Spring: Natural state height h = 14 mm. When the valve cover is screwed to the upper limit, the spring installation height h = 12 mm, and at this time F (upper limit elastic force) = 10.5 N; when the valve cover is screwed to the lower limit, the spring installation height at this time is h = 9 mm, and at this time F (lower limit elastic force) = 25.5 N.

[0028] 1. Exhaust state in low-pressure stage: ① G (valve stem + valve stem seal ring) = m (valve stem + valve stem seal ring)g = 0.02 N; Wherein, G is gravity, m is mass, and g is gravitational acceleration, the same hereinafter.

[0029] ② When F (upward pressure on the valve stem) = G (valve stem + valve stem seal ring) = 0.02 N, P (pipe pressure) = F (upward pressure on the valve stem) / S (cross-sectional force-bearing area of the valve stem in low-pressure stage) = 0.02 N / 8 mm² = 0.025 bar; Wherein, F is pressure, P is pressure, and g is gravitational acceleration, the same hereinafter.

[0030] ③ When F (upward pressure on the valve stem) < G (valve stem + valve stem seal ring), that is, P (pipe pressure) < 0.025 bar, the valve stem and the valve stem seal ring are in a falling state, and at this time, air can pass through the clearance between the valve stem and the valve core to achieve low-pressure exhaust.

[0031] 2. Normal working state in medium-pressure stage (when the valve cover is screwed to the upper limit): ① G (valve core + valve core seal ring + valve stem + valve stem seal ring) = 0.07 N; ② When F (upward pressure on the valve stem and valve core assembly) = G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (upper limit elastic force) = 10.5 N + 0.07 N = 10.57 N, P (pipe pressure) = F (upward pressure on the valve stem and valve core assembly) / S (sum of cross-sectional force-bearing areas of valve stem and valve core assembly in medium-pressure stage) ≈ 1.6 bar; ③ When F (upward pressure on the valve stem and valve core assembly) > G (valve stem + valve stem seal ring) and F (upward pressure on the valve stem and valve core assembly) < G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (upper limit elastic force), that is, 0.025 bar < P (pipe pressure) < 1.6 bar, the valve stem and the valve core are in a sealed state, and at the same time, the valve core and the valve body are also in a sealed state, and the pipeline works normally at this time.

[0032] 3. Pressure relief state in high-pressure stage (when the valve cover is screwed to the upper limit): F (upward pressure on the valve stem and valve core assembly) > G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (upper limit elastic force), that is, when P (pipe pressure) > 1.6 bar, the valve core is lifted, and at this time, pressure can be relieved through the clearance between the valve core and the valve body.

[0033] 4. Normal working state in the medium-pressure stage (when the valve cover is screwed to the lower limit): ① G (valve core + valve core seal ring + valve stem + valve stem seal ring) = 0.07 N; ② When F (upward pressure on the valve stem and valve core assembly) = G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (lower limit elastic force) = 25.57 N, P (pipe pressure) = F (upward pressure on the valve stem and valve core assembly) / S (sum of cross-sectional force-bearing areas of the valve stem and valve core assembly in the medium-pressure stage) ≈ 3.9 bar; ③ When F (upward pressure on the valve stem and valve core assembly) > G (valve stem + valve stem seal ring) and F (upward pressure on the valve stem and valve core assembly) < G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (lower limit elastic force), that is, when 0.025 bar < P (pipe pressure) < 3.9 bar, the valve stem and the valve core are in a sealed state, and at the same time, the valve core and the valve body are also in a sealed state, and at this time, the pipeline works normally.

[0034] 5. Pressure relief state in the high-pressure stage (when the valve cover is screwed to the lower limit): F (upward pressure on the valve stem and valve core assembly) > G (valve core + valve core seal ring + valve stem + valve stem seal ring) + F (lower limit elastic force), that is, when P (pipe pressure) > 3.9 bar, the valve core is lifted, and at this time, pressure can be relieved through the clearance between the valve core and the valve body.

[0035] Embodiment 2 A pressure relief valve for a coffee machine provided in this embodiment is as Figures 10-12As shown, the difference from the pressure relief valve in the first embodiment is that the upper cross-section of the valve stem is a regular polygon, that is, the cross-section of its rod body 31 is a regular polygon, and the inner cross-section of the valve core 2 is circular. The number of sides of the regular polygon is 3-6. The core of this preferred solution lies in that the upper cross-section of the valve stem adopts a regular polygon structure with 3-6 sides, forming an internal central symmetric clearance fit with the circular inner cross-section of the valve core. Compared with the traditional circular-circular contact structure in the first embodiment, this design has achieved a breakthrough improvement in increasing exhaust characteristics, anti-scale performance and movement stability. Due to the high-pressure adsorption effect of the continuous contact surface, the traditional full circumferential contact structure is extremely prone to form a linear scale deposition zone in a hard water environment. This solution reconstructs the contact mode into discrete point contact (that is, the vertices of the regular polygon are tangent to the inner wall of the circle). By reducing the effective contact area and concentrating the contact stress, the scale nucleation site is transferred from the continuous contact zone to the non-contact clearance area. This design can greatly reduce the probability of scale deposition in the contact point area, and at the same time, utilize the enhanced effect of the fluid shear force in the clearance channel to achieve the dynamic scouring of microscopic scale particles. This active anti-scale mechanism effectively solves the problem of valve core jamming caused by scale accumulation in the traditional structure. In addition, the small contact surface reduces the friction between the valve core and the valve stem, and reducing the scale further reduces the friction between the valve core and the valve stem. The sliding interface between the valve core and the valve stem maintains a low friction state for a long time, avoiding the problem of non-linear increase in the friction coefficient caused by scale thickening in the traditional structure, and significantly improving the action response sensitivity. In this embodiment, the number of sides of the regular polygon of the upper cross-section of the valve stem is selected to be 6.

[0036] Embodiment 3 A coffee machine provided in this embodiment includes a pressure relief valve as in the first embodiment. This coffee machine also has the above-mentioned advantages of simple structure and remarkable effect in satisfying the accurate exhaust demand in the low-pressure stage and meeting the safety protection requirements during high-pressure overload.

[0037] The present invention is described through preferred embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A pressure relief valve for a coffee machine, characterized in that: It includes a valve body (1), and a first joint (11) communicating with the outside atmosphere and a second joint (12) communicating with the water circuit system are arranged on the valve body (1); a valve core (2), a valve rod (3) and a spring (4) are arranged in the valve body (1), the valve core (2) is located on one side of the first joint (11), the valve rod (3) is located below the valve core (2) and on one side of the second joint (12), one end of the spring (4) abuts against the upper part of the valve body (1), and the other end of the spring (4) abuts against the valve core (2); When the water circuit system is below the first pressure relief pressure, the valve rod (3) and the valve core (2) are separated from each other to form a first pressure relief channel, so that the water circuit system is communicated with the outside atmosphere. When the water circuit system is between the first pressure relief pressure and the second pressure relief pressure, the valve rod (3) and the valve core (2) are in contact with each other, so that the water circuit system is isolated from the atmospheric pressure. When the water circuit system is above the second pressure relief pressure, the valve rod (3) jacks up the valve core (2) to form a second pressure relief channel, so that the water circuit system is communicated with the outside atmosphere.

2. The pressure relief valve according to claim 1, characterized in that: The valve body (1) includes an upper chamber (13) and a lower chamber (14); The valve core (2) is located in the upper chamber (13), the valve rod (3) is located in the lower chamber (14), and a limiting part is arranged between the upper chamber (13) and the lower chamber (14) to prevent the valve core (2) from moving into the lower chamber (14).

3. The pressure relief valve according to claim 1, characterized in that: A valve core sealing ring (5) is arranged between the valve core (2) and the inside of the valve body (1).

4. The pressure relief valve according to claim 1, characterized in that: The middle part of the valve core (2) is of a communicating structure, and the rod body of the valve rod (3) penetrates through the middle part of the valve core (2).

5. The pressure relief valve according to claim 4, characterized in that The upper cross-section of the valve rod (3) is a regular polygon, the inner cross-section of the valve core (2) is a circle, and the number of sides of the regular polygon is 3-6.

6. The pressure relief valve according to claim 4, characterized in that An arc-shaped air passage groove is arranged at the lower part of the valve rod (3).

7. The pressure relief valve according to claim 4, characterized in that: A valve rod sealing ring (6) is sleeved on the rod body of the valve rod (3).

8. The pressure relief valve according to claim 1, characterized in that: An axially movable valve cover (7) is arranged at the upper part of the valve body (1); One end of the spring (4) abuts against the bottom of the valve cover (7), and the other end of the spring (4) abuts against the valve core (2).

9. The pressure relief valve according to claim 8, characterized in that: The valve cover (7) and the valve body (1) are in threaded connection.

10. A coffee machine, characterized in that: It includes the pressure relief valve according to any one of claims 1-9.

Images