A solenoid valve

Abstract

A solenoid valve belongs to the technical field of refrigeration components. The piston component of the present invention includes a piston core, a piston and a sealing block. The piston is provided with a first step hole with two step surfaces. The piston core and the sealing block are installed from bottom to top on the step surface in the corresponding first step hole. The top hole wall of the first step hole extends a riveted part upward, and the riveted part shrinks inward to limit and fix the outer side of the sealing block. The present invention arranges a sealing member on the top of the piston, and limits the sealing member in the step hole of the piston through a riveted compression opening, thereby preventing the riveted component from falling into the air-conditioning system, improving the safety of the system, and not affecting the flow of the solenoid valve. The piston and the sealing block of the present invention are simple to process, which can improve processing efficiency and reduce processing costs.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration components, and in particular relates to a solenoid valve used in an air-conditioning system. Background Art

[0002] Patent publication number CN 101893098 A discloses a solenoid valve with a reversible function, and its scheme is: the solenoid valve includes a piston with a balancing hole and a valve core accommodating cavity, and the balancing hole and the valve core accommodating cavity are connected through a sealing port; a valve core is movably provided in the valve core accommodating cavity, and the top of the valve core has a sealing surface for blocking the sealing port, and the main body of the valve core has a central through hole arranged along its axial direction, and at least one radial hole connecting the valve core accommodating cavity and the central through hole; the valve core accommodating cavity is a straight cylindrical cavity, and the main body of the valve core includes an upper part and a lower part with a diameter larger than the upper part; the lower part is tightly matched with the inner wall of the valve core accommodating cavity, and the radial hole is arranged in the upper part. The inner wall of the lower end of the piston is provided with a gasket coaxial with the valve core, the outer diameter of the gasket is slightly larger than the diameter of the outer circle of the lower part, and the inner diameter of the gasket is slightly smaller than or equal to the inner diameter of the lower part, and the gasket and the piston are fixed by riveting. However, this solenoid valve has the following defects:

[0003] 1. When the solenoid valve fluid flow direction switches or the pressure fluctuates, the piston core will hit the gasket, especially under high pressure conditions, the impact force of the piston core on the gasket is greater. When the piston core impacts multiple times, the piston riveted parts are prone to breakage, causing the gasket and piston core to fall off and fall into the system. Especially when the solenoid valve is installed close to the compressor, the fallen gasket and piston core will fall directly into the compressor, destroying the compressor and causing damage to the entire system;

[0004] 2. Since the riveted part is very close to the valve port, when the piston hits the valve port, the stress generated by the impact will also affect the strength of the riveted part of the gasket, thereby accelerating the damage of the riveted part of the gasket;

[0005] 3. In the prior art, since the riveted portion of the piston is located at the lower end of the sealing line between the piston and the main valve port, when the main valve port is opened, the riveted portion cannot completely leave the valve port, affecting the flow rate of the fully opened solenoid valve;

[0006] 4. Since the diameter of the gasket is smaller than the diameter of the valve core, the fluid will flow in too slowly, making it difficult to establish a pressure difference between the upper and lower parts of the piston core, resulting in slow valve opening. Summary of the invention

[0007] In view of the problems existing in the solenoid valve in the above background, the present invention aims to provide a solenoid valve whose piston riveted part is not easy to break or be damaged and which is easy to assemble.

[0008] To this end, the present invention adopts the following technical solution: a solenoid valve, comprising a valve seat, a piston component and a valve body, wherein the top opening of the valve seat forms a first valve cavity, the bottom of the valve body is fixed to the upper end of the first valve cavity, the first valve cavity is formed into a sealed cavity through the valve body and the valve seat, the side of the first valve cavity is connected with a first connecting pipe, and the bottom of the first valve cavity is connected with a second connecting pipe through a main valve port;

[0009] Its characteristic is that the piston component includes a piston core, a piston and a sealing block, the piston is provided with a first step hole with two step surfaces, the piston core and the sealing block are installed from bottom to top on the step surfaces in the corresponding first step hole, the top hole wall of the first step hole extends a riveted part upward, and the riveted part shrinks inward to limit and fix the outer side of the sealing block.

[0010] As a supplement and improvement to the above technical solution, the present invention also includes the following technical features.

[0011] The sealing block is provided with a second step hole which decreases from bottom to top and has two step surfaces. The upper hole of the second step hole serves as a valve port which cooperates with and abuts against the steel ball of the solenoid valve for sealing; the lower hole of the second step hole serves as a second valve cavity for the movement of the piston core. The piston core is movably arranged between the lower step surface of the first step hole and the lower step surface of the second step hole. The accommodating cavity of the piston core formed by the two cavities can increase the thickness of the sealing block and reduce the deformation of the sealing block during riveting.

[0012] The piston core is in a conical shape with a small top and a large bottom. A sealing portion is provided on the top of the piston core, an opening is provided on the bottom of the piston core, and a first cavity and a second cavity are formed from top to bottom inside the piston core. A through hole connected to the second valve cavity is provided on the side of the first cavity.

[0013] The piston and the sealing block are installed with interference fit, thereby improving the connection strength between the sealing block and the piston and preventing the piston core from moving upward and colliding with the sealing block, causing the sealing block and the piston to fall off.

[0014] The bottom of the sealing block has a sealing line, which can prevent the medium from leaking into the first valve cavity from the gap between the sealing block and the piston, causing increased internal leakage of the product and affecting the product valve closing function.

[0015] The sealing surface on the sealing part is a conical surface or a circular surface.

[0016] The second cavity is provided with a plurality of through holes which are evenly distributed around the circumference.

[0017] The first cavity is smaller than the width of the second cavity, and a step surface is formed in the transition area between the first cavity and the second cavity, which can increase the force-bearing area of ​​the piston core and reduce the gravity of the piston core itself. The piston core can move toward the valve port more easily, reducing the reverse minimum valve opening pressure difference.

[0018] The piston core is made of aluminum material, has a small dead weight, and reduces the reverse minimum valve opening pressure difference.

[0019] The edge of the bottom opening of the piston is chamfered to reduce the contact area between the bottom surface of the piston core and the piston, increase the force-bearing area of ​​the piston core 8, and reduce the reverse minimum valve opening pressure difference.

[0020] The lower step surface of the first step hole is matched with the top of the piston core, so that the force-bearing area of ​​the piston core can be increased, throttling can be avoided, and the reverse minimum valve opening pressure difference can be reduced.

[0021] The lower end of the piston core is provided with a limiting element which is integrally connected with the piston.

[0022] The present invention can achieve the following beneficial effects: 1. The present invention sets a seal on the top of the piston and limits the seal in the step hole of the piston through the riveting compression port, thereby preventing the riveted parts from falling into the air conditioning system, improving the safety of the system, and not affecting the flow of the solenoid valve. 2. The piston and the sealing block of the present invention are simple to process, which can improve the processing efficiency and reduce the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the piston component of the present invention.

[0025] Figure 3 It is a schematic diagram of the piston structure of the present invention.

[0026] Figure 4 It is a schematic diagram of the sealing block structure of the present invention.

[0027] Figure 5 It is a schematic diagram of the piston core structure of the present invention. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-Figure 5As shown, the present invention includes a valve seat 1, a piston component and a valve body 2. The top opening of the valve seat 1 forms a first valve cavity. The bottom of the valve body is fixed to the upper end of the first valve cavity. The first valve cavity is formed into a sealed cavity through the valve body 2 and the valve seat 1. The side of the first valve cavity is connected with a first connecting pipe 3. The bottom of the first valve cavity is connected with a second connecting pipe 4 by setting a main valve port. The piston component includes a piston core 6, a piston 5 and a sealing block 7. The piston 5 has a balancing hole 53. The piston 5 is provided with a first step hole 51 with two step surfaces. The piston core 6 and the sealing block 7 are installed from bottom to top on the step surfaces in the corresponding first step hole. The top hole wall of the first step hole extends upward to form a riveted portion 52, and the riveted portion 52 shrinks inward to limit and fix the outer side of the sealing block 7. The sealing block 7 is provided with a second step hole 71 which decreases from bottom to top and has two step surfaces. The upper hole of the second step hole 71 serves as a valve port 72 which cooperates with the steel ball 8 of the solenoid valve; the lower hole of the second step hole 71 serves as a second valve cavity 73 for the piston core 6 to move. The piston core 6 is movably arranged between the lower step surface of the first step hole 51 and the lower step surface of the second step hole 71. The accommodating cavity of the piston core formed by the two cavities can increase the thickness of the sealing block and reduce the deformation of the sealing block when riveting. The piston core 6 is in a conical shape with a small top and a large bottom. The top of the piston core 6 is provided with a sealing portion, the bottom of the piston core 6 is provided with an opening, and the first cavity 61 and the second cavity 62 are formed from top to bottom inside the piston core. The side of the first cavity 61 is provided with a through hole 63 which is connected with the second valve cavity 73.

[0030] Further preferably, the piston 5 and the sealing block 7 are installed with an interference fit, thereby improving the connection strength between the sealing block and the piston, preventing the piston core from moving upward and colliding with the sealing block, causing the sealing block and the piston to fall off. The bottom of the sealing block 7 has a sealing line to prevent the medium from leaking into the first valve chamber from the gap between the sealing block and the piston, causing increased leakage in the product and affecting the product's valve closing function. The edge of the bottom opening of the piston 5 is chamfered to reduce the contact area between the bottom surface of the piston core and the piston, increase the force area of ​​the piston core 8, and reduce the reverse minimum valve opening pressure difference. The lower step surface of the first step hole 51 is matched with the top of the piston core 6, so that the force area of ​​the piston core can be increased, throttling can be avoided, and the reverse minimum valve opening pressure difference can be reduced.

[0031] Further preferably, the first cavity 61 is smaller than the width of the second cavity 62, and a step surface is formed in the transition area between the first cavity 61 and the second cavity 62, which can increase the force-bearing area of ​​the piston core and reduce the gravity of the piston core itself. The piston core can move toward the valve port more easily, reducing the reverse minimum valve opening pressure difference.

[0032] Further preferably, the piston core 6 is made of aluminum material, which has a small deadweight and reduces the reverse minimum valve opening pressure difference. A limit element connected to the piston 5 is arranged at the lower end of the piston core 6.

[0033] When the piston core moves upward and hits the sealing block, the impact force is transmitted to the riveted part between the sealing block and the piston. Since the riveted part is located at the upper part of the piston, there is no need to consider the impact on the flow rate. The size of the riveted part can be larger than that of the prior art, and the thickness of the riveted part can be appropriately increased, and the riveted strength of the sealing block can be greatly improved. At the same time, the force on the riveted part is the force generated when the piston core closes the sealing block. This force-bearing mode has the following advantages: ① When the fluid flows forward, no matter the piston opens or closes the valve, the piston core will be in a weightless state due to the very fast movement of the piston, thereby generating an impact force on the piston. In this solution, the piston core hits the piston body, and the impact force will not be transmitted to the riveted part (the impact force of the piston core in the prior art is borne by the riveted part); ② When the forward flow suddenly switches to the reverse flow state, since the valve port is in the open valve state, the system pressure difference will not be very large, and the impact force of the piston core on the sealing block is very small. Even if the system pressure is very high, as long as the piston core does not close the sealing block, it is difficult to establish a large pressure difference at both ends of the piston core, that is, the speed at which the piston core hits the sealing block is not large, so the impact force borne by the sealing block is relatively small, and the damage to the riveted part is relatively small. Even if the sealing block and the piston fall off, the parts in the electromagnetic valve will not fall into the system, will not damage the system, and will only cause partial loss of function.

Claims

1. A solenoid valve, comprising a valve seat (1), a piston component and a valve body (2), wherein the top opening of the valve seat (1) forms a first valve cavity, the bottom of the valve body is fixed to the upper end of the first valve cavity, the first valve cavity is formed into a sealed cavity through the valve body (2) and the valve seat (1), the side of the first valve cavity is connected to a first connecting pipe (3), and the bottom of the first valve cavity is connected to a second connecting pipe (4) through a main valve port; Features: The piston component comprises a piston core (6), a piston (5) and a sealing block (7); the piston (5) is provided with a first step hole (51) having two step surfaces; the piston core (6) and the sealing block (7) are mounted on the step surfaces in the corresponding first step hole from bottom to top; a riveted portion (52) extends upward from the top hole wall of the first step hole; the riveted portion (52) shrinks inward to limit and fix the outer portion of the sealing block (7); the sealing block (7) is provided with a second step hole (71) which decreases in size from bottom to top and has two step surfaces; the upper hole of the second step hole (71) serves as a valve port (72) for cooperating with a steel ball (8) of the solenoid valve; the lower hole of the second step hole (71) serves as a second valve chamber (73) for the piston core (6) to move; the piston core (6) is movably arranged between the lower step surface of the first step hole (51) and the lower step surface of the second step hole (71).

2. A solenoid valve according to claim 1, characterized in that: The piston core (6) is in a conical shape that is smaller at the top and larger at the bottom. A sealing portion is provided at the top of the piston core (6). An opening is provided at the bottom of the piston core (6) and a first cavity (61) and a second cavity (62) are formed inside the piston core from top to bottom. A through hole (63) communicating with the second valve cavity (73) is provided on the side of the first cavity (61).

3. A solenoid valve according to claim 2, characterized in that: The piston (5) and the sealing block (7) are installed in an interference fit.

4. A solenoid valve according to claim 3, characterized in that: The bottom of the sealing block (7) has a sealing line.

5. A solenoid valve according to claim 4, characterized in that: The first cavity (61) is smaller than the width of the second cavity (62), and a step surface is formed in the transition area between the first cavity (61) and the second cavity (62).

6. A solenoid valve according to claim 5, characterized in that: The piston core (6) is made of aluminum material.

7. A solenoid valve according to claim 6, characterized in that: The edge of the bottom opening of the piston (5) is chamfered.

8. A solenoid valve according to claim 7, characterized in that: The lower step surface of the first step hole (51) is matched with the top of the piston core (6).

9. A solenoid valve according to claim 1 or 8, characterized in that: The lower end of the piston core (6) is provided with a limiting element which is integrally connected to the piston (5).

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