A relief valve

Abstract

The utility model relates to a valve, specifically disclose a unloading valve at least including valve body, valve rod, diaphragm mechanism, auxiliary spring, adjusting cylinder, pressure regulating spring, top plug and adjusting plug. Among them, the lower diaphragm fixed base includes the horizontal extension diaphragm fixed section one and the axial extension valve body connecting section, the diaphragm fixed section one and valve body connecting section between smooth transition connection, the upper end of valve body is provided with the outer ring groove of with the inner chamber of valve body connecting section adaptation, the axial height of outer ring groove with the axial height of valve body connecting section adaptation, the radial depth of outer ring groove with the thickness of lower diaphragm fixed base adaptation, valve body connecting section is set up on outer ring groove and is fixed through welding. In the utility model, based on the cooperation between valve body connecting section and outer ring groove on the valve body of lower diaphragm fixed base, a longer welding lap joint surface is formed, which has higher reliability under high pressure environment, and the service life of the unloading valve is longer.

Description

Technical Field

[0001] This utility model relates to a valve, specifically an unloading valve. Background Technology

[0002] An unloading valve, also known as a pressure regulating valve, is a type of valve that adjusts its opening based on changes in input pressure. It is typically used for adjusting the pressure in systems such as air conditioning and refrigeration units.

[0003] Chinese utility model patent CN202580183U discloses a pressure regulating valve, which includes a valve body 101, a valve seat 104, a lower cover 106, an upper cover 107, a diaphragm 108, an auxiliary spring 109, a valve stem 110, a valve ball 105, a spring retractor 118, and an adjusting spring 111. The lower cover 106 is welded to the upper end of the valve body 101, and the upper cover 107 is fixed to the upper end of the upper cover 107. However, the contact surface height between the lower cover 106 and the valve body 101 is only the thickness of the lower cover, and the upper end of the upper cover 107 has a groove adapted to the thickness of the spring retractor 118. In short, the contact areas between the lower cover and the valve body, and between the upper cover and the spring retractor 118, are small, making them prone to failure under long-term high-pressure operation, resulting in a short service life for the pressure regulating valve. Furthermore, the groove on the valve stem for connecting the valve ball is shallow, and the valve ball is fixed to the valve stem by resistance welding. However, the valve ball used in unloading valves is usually made of AISI 440C, which is prone to cracking during welding, causing internal leakage. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an unloading valve with more reliable connection and longer service life.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: an unloading valve, comprising at least:

[0006] The valve body has a valve stem cavity, a valve port is provided at the bottom of the valve stem cavity, and the valve body has an inlet port communicating with the valve stem cavity and an unloading port communicating with the valve port.

[0007] A valve stem, which is slidably disposed within a valve stem cavity, and a valve ball for controlling the opening and closing of the valve port is disposed at the bottom of the valve stem cavity;

[0008] A diaphragm mechanism, comprising an upper diaphragm fixing seat, a lower diaphragm fixing seat disposed opposite to each other, and a diaphragm assembly located between the upper diaphragm fixing seat and the lower diaphragm fixing seat;

[0009] An auxiliary spring is disposed in the valve body and drives the valve stem to abut against the bottom of the diaphragm assembly;

[0010] An adjusting cylinder is fixedly connected above the upper diaphragm fixing seat;

[0011] A pressure regulating spring is disposed inside the regulating cylinder;

[0012] The top plug is located below the pressure regulating spring and abuts against the diaphragm assembly;

[0013] An adjusting plug is threadedly connected to the upper port of the adjusting cylinder;

[0014] The lower diaphragm fixing seat includes a horizontally extending diaphragm fixing section and an axially extending valve body connecting section, which are smoothly connected. The upper end of the valve body is provided with an outer annular groove that matches the inner cavity of the valve body connecting section. The axial height of the outer annular groove matches the axial height of the valve body connecting section, and the radial depth of the outer annular groove matches the thickness of the lower diaphragm fixing seat. The valve body connecting section is sleeved on the outer annular groove and fixed by welding.

[0015] In a preferred embodiment, the upper diaphragm fixing seat includes a horizontally extending diaphragm fixing section two, a horizontally extending positioning section, a connecting section connecting the diaphragm fixing section two and the positioning section, an adjusting cylinder connecting section connected to the positioning section and extending axially, and an upper cover plate disposed at the upper end of the adjusting cylinder connecting section. The upper cover plate is provided with a central through hole, and the interior of the adjusting cylinder connecting section forms a top plug cavity for accommodating the top plug.

[0016] In a preferred embodiment, the outer diameter of the adjusting cylinder connecting section is adapted to the inner diameter of the adjusting cylinder, the adjusting cylinder is sleeved on the adjusting cylinder connecting section, the lower end of the adjusting cylinder abuts against the positioning section, and the adjusting cylinder is welded and fixed to the upper diaphragm fixing seat.

[0017] In a preferred embodiment, the bottom of the valve stem is provided with a valve ball mounting hole for accommodating the valve ball. The depth of the valve ball mounting hole is greater than the radius of the valve ball. The valve ball is installed in the valve ball mounting hole. A constriction is formed at the opening of the valve ball mounting hole, and the constriction restricts the valve ball to be located within the valve ball mounting hole.

[0018] In a preferred embodiment, the spring bracket is disposed at the lower end of the pressure regulating spring, and a ball is disposed between the spring bracket and the top plug.

[0019] In a preferred embodiment, the sphere passes through the central through hole, and the outer diameter of the sphere is smaller than the inner diameter of the central through hole.

[0020] In a preferred embodiment, an auxiliary spring cavity is provided inside the valve body, an auxiliary spring is installed in the auxiliary spring cavity, and a partition wall is provided between the auxiliary spring cavity and the valve stem cavity.

[0021] In a preferred embodiment, the auxiliary spring cavity is provided with a pressure equalization hole extending through to the liquid inlet.

[0022] In a preferred embodiment, the valve stem includes a valve stem body and an end cap disposed at the upper end of the valve stem body, wherein a limiting step is formed between the end cap and the valve stem body.

[0023] In a preferred embodiment, the device further includes a washer fitted onto the valve stem body, the upper end face of the washer abutting against the limiting step, and the lower end of the washer abutting against the auxiliary spring.

[0024] The unloading valve of this embodiment has the following advantages compared with the prior art:

[0025] (1) Based on the fit between the valve body connecting section on the lower diaphragm fixing seat and the outer ring groove on the valve body, a longer welding lap surface is formed. Under high pressure, its connection reliability is stronger, which makes the unloading valve have a longer service life.

[0026] (2) Based on the setting of the upper diaphragm fixing seat and the upper regulating cylinder connection 2, a longer welding overlap surface is formed between it and the regulating cylinder. Under high pressure environment, its connection reliability is stronger, which makes the service life of the unloading valve longer.

[0027] (3) The inside of the adjusting cylinder connecting section forms a top plug cavity, and the axial height of the top plug cavity is also higher, and the stroke of the top plug is also longer.

[0028] (4) Since the depth of the valve ball mounting hole is greater than the radius of the valve ball, after the valve ball is installed in the valve ball mounting hole, the opening of the valve ball mounting hole is narrowed to form a narrow opening, which confines the valve ball within the valve ball mounting hole. With this design, there is no need to weld between the valve ball and the valve ball mounting hole, avoiding the risk of cracks caused by welding during traditional welding, resulting in higher reliability and a longer service life for the unloading valve.

[0029] (5) The washer is fitted onto the valve stem body of the valve stem. The upper end of the washer abuts against the limiting step, and the lower end of the washer abuts against the auxiliary spring, thereby limiting the auxiliary spring between the auxiliary spring cavity and the washer. The auxiliary spring drives the valve stem to abut against the bottom of the diaphragm assembly. This type of valve stem and washer structure is simpler, has lower manufacturing costs, and is simpler and more reliable to assemble. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the unloading valve in this embodiment;

[0031] Figure 2This is a cross-sectional view of the diaphragm mechanism in the unloading valve of this embodiment;

[0032] Figure 3 This is a cross-sectional view of the valve body in the unloading valve of this embodiment;

[0033] Figure 4 This is a cross-sectional view of the valve stem, auxiliary spring, washer, and valve ball assembly in the unloading valve of this embodiment.

[0034] Figure 5 This is a cross-sectional view of the valve stem in the unloading valve of this embodiment;

[0035] Figure 6 This is a schematic diagram of the gasket structure in the unloading valve of this embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0039] like Figure 1 As shown, an unloading valve in this embodiment includes a valve body 10, a valve stem 60, a diaphragm mechanism, an auxiliary spring 80, an adjusting cylinder 50, a pressure adjusting spring 70, an adjusting plug 90, and a top plug 103. The pressure adjusting spring is installed inside the adjusting cylinder, and the adjusting plug 90 is threadedly connected to the upper end of the adjusting cylinder 50. By rotating the adjusting plug 90, the pressure applied to the diaphragm assembly by the pressure adjusting spring can be adjusted.

[0040] In this embodiment, the structure of the valve body 10 is as follows: Figure 3As shown, the valve stem cavity 11 and the auxiliary spring cavity 12 are provided inside, and a partition wall 13 is provided between the valve stem cavity 11 and the auxiliary spring cavity 12. The auxiliary spring 80 is installed in the auxiliary spring cavity 12, and the valve stem 60 is slidably disposed in the valve stem cavity 11.

[0041] In this embodiment, the valve body 10 is provided with an inlet 15 and an unloading port 16 that communicate with the valve stem cavity. The bottom of the valve stem cavity 11 is provided with a valve port 17, which communicates with the unloading port 16.

[0042] In this embodiment, the valve body 10 has an inlet pipe interface 151 at the inlet 15 for connecting to the inlet pipe 101. The valve body 10 has an outlet pipe interface 161 at the unloading port 16 for connecting to the outlet pipe 102.

[0043] In this embodiment, the auxiliary spring cavity 12 is provided with a pressure equalization hole 18 extending through to the liquid inlet 15. This pressure equalization hole helps the liquid entering from the liquid inlet pipe to flow through the auxiliary spring cavity to the diaphragm assembly 40.

[0044] As a special feature of this embodiment, such as Figure 5 As shown, the valve stem 60 includes a valve stem body 61 and an end cap 62 disposed at the upper end of the valve stem body, forming a limiting step 63 between the end cap 62 and the valve stem body 61. This embodiment also includes a washer 106, such as... Figure 6 As shown, the washer 106 has a washer hole 107 at its center. Figure 1 As shown, the washer 106 is fitted onto the valve stem body 61 through the washer hole 107. The upper end face of the washer 106 abuts against the limiting step 63, and the lower end of the washer 106 abuts against the auxiliary spring 80, thereby limiting the auxiliary spring 80 between the auxiliary spring cavity and the washer. The auxiliary spring drives the valve stem to abut against the bottom of the diaphragm assembly 40.

[0045] Compared with the existing technology of slotting the valve stem and inserting an elastic retaining spring into the slot, the structure of the valve stem and washer in this embodiment is simpler, the manufacturing cost is lower, and the assembly method is simpler and more reliable.

[0046] As a special feature of this embodiment, such as Figure 4 , Figure 5 As shown, the bottom of the valve stem 60 is provided with a valve ball mounting hole 64 for accommodating the valve ball 100. The depth of the valve ball mounting hole 64 is greater than the radius of the valve ball 100. After the valve ball 100 is installed in the valve ball mounting hole 64, the opening of the valve ball mounting hole 64 is narrowed to form a narrowed opening 65, which confines the valve ball 100 within the valve ball mounting hole 64.

[0047] Because the groove at the bottom of the traditional valve stem for connecting the valve ball is relatively shallow, the valve ball and valve stem are fixed together by resistance welding. However, the valve ball used in unloading valves is typically made of AISI 440C, which is prone to cracking during welding, leading to internal leakage. In this embodiment, through a special structural design, welding is not required between the valve ball and the valve ball mounting hole, avoiding the risk of valve ball cracking due to welding as in traditional methods. This results in higher reliability and a longer service life for the unloading valve.

[0048] In this embodiment, as Figure 1 , Figure 2 As shown, the diaphragm mechanism includes an upper diaphragm fixing seat 30, a lower diaphragm fixing seat 20, and a diaphragm assembly 40 located between the upper and lower diaphragm fixing seats. In this embodiment, the diaphragm is made of a high-strength material to ensure a long service life. Preferably, in this embodiment, the diaphragm assembly 40 includes four overlapping diaphragms; a larger number of diaphragms can withstand higher unloading pressure and extend the service life.

[0049] As a special feature of this embodiment, such as Figure 2 As shown, the lower diaphragm holder 20 includes a horizontally extending diaphragm fixing section 21 and an axially extending valve body connecting section 22, wherein the diaphragm fixing section 21 and the valve body connecting section 22 are smoothly connected. Accordingly, as... Figure 3 As shown, the upper end of the valve body 10 is provided with an outer annular groove 14 that matches the inner cavity of the valve body connecting section 22. The axial height of the outer annular groove matches the axial height of the valve body connecting section 22, and the radial depth of the outer annular groove 14 matches the thickness of the lower diaphragm fixing seat 20. During assembly, the valve body connecting section 22 is sleeved on the outer annular groove 14 and fixed by welding.

[0050] In this embodiment, based on the fit between the valve body connecting section 22 and the outer ring groove 14, a longer welding lap surface is formed, which makes the connection more reliable under high pressure environment and makes the service life of the unloading valve longer.

[0051] As a special feature of this embodiment, such as Figure 2 As shown, the upper diaphragm fixing seat 30 includes a horizontally extending diaphragm fixing section 31, a horizontally extending positioning section 35, a connecting section 33 connecting the diaphragm fixing section 31 and the positioning section 35, an adjusting cylinder connecting section 32 connected to the positioning section 35 and extending axially, and an upper cover plate 34 disposed at the upper end of the adjusting cylinder connecting section. The upper cover plate 34 is provided with a central through hole 36, and the interior of the adjusting cylinder connecting section 32 forms a top plug cavity 37 for accommodating the top plug 103.

[0052] In this embodiment, the outer diameter of the adjusting cylinder connecting section 32 is adapted to the inner diameter of the adjusting cylinder 50. The adjusting cylinder 50 is sleeved on the adjusting cylinder connecting section 32, and the lower end of the adjusting cylinder 50 abuts against the positioning section 35. The adjusting cylinder is welded and fixed to the upper diaphragm fixing seat.

[0053] In this embodiment, based on the configuration of the regulating cylinder connecting section 32, a longer welding overlap surface is formed between it and the regulating cylinder. Under high pressure, its connection reliability is stronger, resulting in a longer service life of the unloading valve. In addition, a top plug cavity is formed inside the regulating cylinder connecting section, and the axial height of the top plug cavity is also relatively high, resulting in a longer stroke of the top plug.

[0054] In this embodiment, as a preferred option, such as Figure 1 As shown, it also includes a spring bracket 104 disposed at the lower end of the pressure regulating spring 70 and a ball 103 disposed between the spring bracket and the top plug.

[0055] Preferably, the sphere 103 penetrates the central through hole 36, and the outer diameter of the sphere 103 is smaller than the inner diameter of the central through hole 36. With this arrangement, there is no contact between the sphere and the central through hole, resulting in no frictional resistance and a more rapid response to fluid pressure.

[0056] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An unloading valve, comprising at least: The valve body has a valve stem cavity, a valve port is provided at the bottom of the valve stem cavity, and the valve body has an inlet port communicating with the valve stem cavity and an unloading port communicating with the valve port. A valve stem, which is slidably disposed within a valve stem cavity, and a valve ball for controlling the opening and closing of the valve port is disposed at the bottom of the valve stem cavity; A diaphragm mechanism, comprising an upper diaphragm fixing seat, a lower diaphragm fixing seat disposed opposite to each other, and a diaphragm assembly located between the upper diaphragm fixing seat and the lower diaphragm fixing seat; An auxiliary spring is disposed in the valve body and drives the valve stem to abut against the bottom of the diaphragm assembly; An adjusting cylinder is fixedly connected above the upper diaphragm fixing seat; A pressure regulating spring is disposed inside the regulating cylinder; The top plug is located below the pressure regulating spring and abuts against the diaphragm assembly; An adjusting plug is threadedly connected to the upper port of the adjusting cylinder; The lower diaphragm fixing seat is characterized in that it includes a horizontally extending diaphragm fixing section and an axially extending valve body connecting section, and the diaphragm fixing section and the valve body connecting section are smoothly connected; the upper end of the valve body is provided with an outer annular groove adapted to the inner cavity of the valve body connecting section, the axial height of the outer annular groove is adapted to the axial height of the valve body connecting section, the radial depth of the outer annular groove is adapted to the thickness of the lower diaphragm fixing seat, and the valve body connecting section is sleeved on the outer annular groove and fixed by welding.

2. The unloader valve of claim 1, wherein The upper diaphragm fixing seat includes a horizontally extending diaphragm fixing section two, a horizontally extending positioning section, a connecting section connecting the diaphragm fixing section two and the positioning section, an adjusting cylinder connecting section connected to the positioning section and extending axially, and an upper cover plate disposed at the upper end of the adjusting cylinder connecting section. The upper cover plate is provided with a central through hole, and the interior of the adjusting cylinder connecting section forms a top plug cavity for accommodating the top plug.

3. The unloader valve of claim 2, wherein The outer diameter of the adjusting cylinder connecting section is adapted to the inner diameter of the adjusting cylinder. The adjusting cylinder is sleeved on the adjusting cylinder connecting section. The lower end of the adjusting cylinder abuts against the positioning section. The adjusting cylinder is welded and fixed to the upper diaphragm fixing seat.

4. The unloader valve of claim 1, wherein The bottom of the valve stem is provided with a valve ball mounting hole for accommodating the valve ball. The depth of the valve ball mounting hole is greater than the radius of the valve ball. The valve ball is installed in the valve ball mounting hole. A constriction is formed at the opening of the valve ball mounting hole, which confines the valve ball within the valve ball mounting hole.

5. The unloader valve of claim 2, wherein It also includes a spring bracket disposed at the lower end of the pressure regulating spring and a ball disposed between the spring bracket and the top plug.

6. The unloader valve of claim 5, wherein The sphere passes through the central through hole, and the outer diameter of the sphere is smaller than the inner diameter of the central through hole.

7. The unloader valve according to any one of claims 1-6, characterized in that An auxiliary spring cavity is provided inside the valve body, and an auxiliary spring is installed inside the auxiliary spring cavity. A partition wall is provided between the auxiliary spring cavity and the valve stem cavity.

8. The unloader valve of claim 7, wherein The auxiliary spring cavity is provided with a pressure equalization hole that extends through to the liquid inlet.

9. The unloader valve of claim 7, wherein The valve stem includes a valve stem body and an end cap disposed at the upper end of the valve stem body, and a limiting step is formed between the end cap and the valve stem body.

10. The unloader valve of claim 9, wherein Further comprising a gasket, the gasket is sleeved on the valve stem body, the upper end surface of the gasket abuts against the limiting step, and the lower end of the gasket abuts against the auxiliary spring.

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