Pressure switch device

Abstract

A pressure switch device includes a housing, a pressure sensing unit, a pipe joint and a connector. The housing defines a receiving space. An outer surface of the housing is recessed to form a connecting hole communicating with the receiving space. The pressure sensing unit is arranged in the housing and includes a pressure sensor located in the receiving space. The pipe joint is detachably arranged in the connecting hole and includes a first connecting section located in the receiving space and an inner pipe passing through both ends of the pipe joint. The connector is located in the receiving space and covers the connecting hole and includes a connecting hole passing through opposite surfaces of the connector and allowing the pressure sensor to pass through. The connector and the first connecting section are detachably connected to allow the pipe joint to be detachably arranged in the housing, and the connecting hole is aligned with the inner pipe, allowing the pressure sensor to pass through the inner pipe. By detachably arranging the pipe joint in the housing through the connector, the pressure switch device can replace pipe joints of different sizes according to the use requirements, thereby achieving the effect of facilitating the use of the pressure switch device.

Description

TECHNICAL FIELD

[0001] The present invention relates to a pressure switch device, and in particular to a pressure switch device using a pressure sensor to detect pressure change of a fluid. BACKGROUND

[0002] The working principle of the pressure switch is that when the pressure of the fluid to be detected reaches a rated value, the elastic element in the pressure switch will be displaced, directly or indirectly pushing the switch element, thereby changing the on-off state of the switch element, so that the pressure switch can send an alarm or control signal. The existing manufacturing method of the pressure switch is to place the pipe joint in the mold of the injection molding process first, then cooperate with the injection molding machine to inject plastic into the mold, so that the plastic and the pipe joint are combined, and when the plastic solidifies, the pipe joint can be fixed on the shell to complete the assembly of the shell and the pipe joint. But the pipe joint fixed by injection molding is assembled with the shell in a fixed manner, which makes the diameter and the size of the inner and outer teeth of the pipe joint of the existing pressure switch cannot be changed after the manufacturing is completed, which is very inconvenient in use. In addition, once the pipe joint is damaged, it cannot be repaired, resulting in high use cost. SUMMARY

[0003] The purpose of the present invention is to provide a pressure switch device that is easy to use and has low maintenance cost.

[0004] The pressure switch device of the present invention comprises a housing, a pressure sensing unit, a pipe joint and a connecting piece.

[0005] The housing defines a receiving space. The outer surface of the housing is recessed to form a connecting through hole communicating with the receiving space.

[0006] The pressure sensing unit is installed in the housing and includes a pressure sensor located in the receiving space.

[0007] The pipe joint can be detachably inserted into the connecting through hole and includes a first connecting section located in the receiving space and an inner pipe passing through both ends of the pipe joint.

[0008] The connecting piece is located in the receiving space and covers the connecting through hole, and includes a communication hole passing through the two opposite surfaces of the connecting piece for the pressure sensor to pass through. The connecting piece and the first connecting section can be detachably connected to allow the pipe joint to be detachably installed in the housing, and the communication hole is aligned with the inner pipe, so that the pressure sensor passes through the inner pipe.

[0009] The first connecting section of the pressure switch device of the present invention is a male screw. The connecting piece is a nut. The connecting piece can be detachably screwed with the first connecting section.

[0010] The pressure switch device further comprises an air-tight ring. The air-tight ring is arranged in the inner pipe and covers the pressure sensor to close the gap between the inner wall of the inner pipe and the pressure sensor.

[0011] The pressure switch device further comprises an air flow guide block. The air flow guide block is arranged in the inner pipe. The air flow guide block is recessed on one side adjacent to the adapter to form a buffer hole for the pressure sensor. The air flow guide block is recessed on the other side away from the adapter to form at least one guide hole communicating with the buffer hole. The diameter of the guide hole is smaller than the diameter of the inner pipe.

[0012] The pressure switch device further comprises a washer. The washer is arranged between the housing and the adapter.

[0013] The adapter hole has a limiting hole part with an opening formed on the outer surface of the housing and a connecting hole part with an opening formed on the inner surface of the housing and allowing the first adapter section to be detachably arranged therein. The pipe joint further comprises a stop section connected to the first adapter section. The stop section is detachably arranged in the limiting hole part, and the outer diameter of the stop section is larger than the connecting hole part so that the stop section cannot be arranged in the connecting hole part.

[0014] The pressure switch device can be used with different sizes of the pipe joint according to the use requirement, so that the pressure switch device is convenient to use. Similarly, only the damaged pipe joint needs to be replaced when the pressure switch device is repaired, so that the maintenance cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view illustrating an embodiment of the pressure switch device of the present application;

[0016] Figure 2 is a perspective exploded view;

[0017] Figure 3 is a perspective exploded view from another angle;

[0018] Figure 4 is a sectional view along line IV-IV in Figure 1 ; DETAILED DESCRIPTION

[0019] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] Referring toFigures 1 to 4 Fig. 1 is a perspective view of a pressure switch device according to an embodiment of the present application. The pressure switch device is adapted to communicate with a fluid source (not shown in the figure) to detect pressure changes of gas or liquid generated by the fluid source. The pressure switch device comprises a housing 1, a pressure sensing unit 2, a pipe joint 3, a connector 4, an airflow guide block 5, an air-tight ring 6, and a washer 7.

[0021] The housing 1, for example, can be a cuboid but is not limited thereto, and defines a receiving space 11 having an opening. An outer surface of the housing 1 away from the opening of the receiving space 11 is recessed to form a connector through-hole 12 communicating with the receiving space 11. In the embodiment, the connector through-hole 12 has a limiting hole portion 121 having an opening formed on an outer surface of the housing 1, and a connecting hole portion 122 having an opening formed on an inner surface of the housing 1 and communicating with the receiving space 11. The opening of the connecting hole portion 122 is circular, and the opening of the limiting hole portion 121 is hexagonal and has a larger inner diameter than that of the connecting hole portion 122, but the openings of the connecting hole portion 122 and the limiting hole portion 121 can have any shape and are not limited to a specific shape.

[0022] The pressure sensing unit 2 is mounted to the housing 1 and includes a circuit board 21, a pressure sensor 22 electrically connected to the circuit board 21 and located in the receiving space 11, and components not shown in detail, such as a control circuit, provided on the circuit board 21. In the embodiment, the circuit board 21 is mounted to the opening of the receiving space 11 in such a manner that holes in the circuit board 21 are inserted by posts of the housing 1 to close the opening of the receiving space 11. The pressure sensor 22 extends from a side of the circuit board 21 adjacent to the connector through-hole 12 toward the connector through-hole 12. The pressure sensor 22 detects pressure of gas or liquid generated by the fluid source and outputs a signal through the circuit board 21.

[0023] The pipe joint 3 is adapted to connect a pipe (not shown) of the fluid source and is detachably inserted into the connection hole 12, and includes a first connection section 31, a stop section 32 connected to the first connection section 31, a second connection section 33 connected to a side of the stop section 32 away from the first connection section 31, and an inner pipe 34 axially extending through both ends of the pipe joint 3. More specifically, the inner pipe 34 extends through the first connection section 31, the stop section 32 and the second connection section 33. One end of the first connection section 31 is located in the accommodation space 11 to be detachably connected to the adapter 4, and the other end of the first connection section 31 is detachably inserted into the connection hole portion 122. The stop section 32 is detachably inserted into the limiting hole portion 121, but the outer diameter of the stop section 32 is greater than the connection hole portion 122, so that the stop section 32 is limited by the shell 1 at the connection between the limiting hole portion 121 and the connection hole portion 122, so that the stop section 32 cannot be inserted into the connection hole portion 122. In addition, the stop section 32 can be an outer hexagonal structure corresponding to the opening shape of the limiting hole portion 121, so that a hexagonal wrench can be used to apply force to the stop section 32 to rotate the pipe joint 3 or to lock the pipe joint 3. In addition, the second connection section 33 is exposed outside the shell 1 to facilitate connection with the pipe of the fluid source. In this embodiment, the second connection section 33 is a threaded pipe structure having internal and external threads (or male and female threads), which can be screwed with a pipe having external threads (male threads) or internal threads (female threads) to facilitate quick connection.

[0024] The adapter 4 is located in the accommodation space 11 and covers the connection hole 12, and includes a communication hole 41 extending through opposite surfaces of the adapter 4 and for the pressure sensor 22 to be inserted. The adapter 4 is detachably connected to the first connection section 31 to detachably mount the pipe joint 3 to the shell 1, and aligns the communication hole 41 with the inner pipe 34, so that the pressure sensor 22 is inserted into the inner pipe 34. In this way, when the user needs to mount the pressure switch device on the pipe of the fluid source with different threads or diameters, the pipe joint 3 corresponding to the threads or diameters of the pipe of the fluid source can be replaced, so that the pressure sensor 22 can be adapted to the pipe of the fluid source with different threads or diameters, and has a universal effect. In this embodiment, the first connection section 31 is a male thread, but is not limited thereto, and the adapter 4 is a nut (or a cap), so that the adapter 4 can be detachably screwed with the first connection section 31 to detachably lock the pipe joint 3 to the shell 1. In addition, the opening shape of the communication hole 41 is hexagonal, so that a hexagonal driver can be inserted to rotate the adapter 4.

[0025] Further, the airflow guide block 5 is arranged in the inner conduit 34 at a position where the inner conduit 34 has a larger diameter. The airflow guide block 5 is recessed on one side adjacent to the adapter 4 to form a buffer hole 51 for the pressure sensor 22. The airflow guide block 5 is recessed on the other side away from the adapter 4 to form a plurality of guide holes 52 which are in communication with the buffer hole 51. The diameter of each of the guide holes 52 is smaller than the diameter of the inner conduit 34. Thus, the gas or liquid generated by the fluid source is first blocked by the outer wall of the airflow guide block 5 before entering the buffer hole 51 through the guide holes 52, so as to avoid directly impacting the detection end of the pressure sensor 22. In this way, the pressure sensor 22 is protected, and the pressure switch device is more durable. In the embodiment, the airflow guide block 5 is in a columnar shape, and the guide holes 52 are arranged in four around the center axis of the airflow guide block 5. However, the implementation of the airflow guide block 5 is not limited to this specific form, and the number of the guide holes 52 can be one, two, three, or more than five, and is not limited to a specific number. In other embodiments, the airflow guide block 5 can also be omitted, and the fluid in the inner conduit 34 can be directly guided to the detection end of the pressure sensor 22.

[0026] The air-tight ring 6 is arranged in the inner conduit 34 and surrounds the pressure sensor 22 to close the gap between the inner wall of the inner conduit 34 and the pressure sensor 22, so that the accommodation space 11 cannot communicate with the gas source. The gasket 7 is arranged between the housing 1 and the adapter 4 to increase the tightness between the housing 1 and the adapter 4, and to avoid loosening of the pipe joint 3 due to vibration. In other embodiments, the gasket 7 can also be omitted, and the adapter 4 directly abuts the housing 1.

[0027] The following, specifically described the pressure switch device assembly and use. First, the airflow guide block 5 and the gas ring 6 are sequentially installed in the inner pipe 34 aperture larger (corresponding to the first link section 31), and the gas ring 6 is adjacent to the opening of the inner pipe 34 than the airflow guide block 5. Then, the pipe joint 3 installed with the airflow guide block 5 and the gas ring 6 is inserted into the connection hole 12, at this time, the threaded portion of the first link section 31 protrudes from the connection hole 122 and is located in the accommodation space 11; the stop section 32 is limited by the shell 1 defined at the junction of the limiting hole 121 and the connection hole 122 and cannot be inserted into the connection hole 122. Then, the gasket 7 is sleeved on the first link section 31 to increase the tightness between the shell 1 and the adapter 4. Then, the stop section 32 of the pipe joint 3 is fixed by a hexagonal wrench, and the adapter 4 is rotated by inserting a hexagonal driver into the communication hole 41, so that the adapter 4 is locked on the first link section 31, so that the pipe joint 3 can be detachably installed on the shell 1, and the airflow guide block 5 and the gas ring 6 are limited by the adapter 4 and cannot be separated from the inner pipe 34. Finally, the pressure sensor 22 is sequentially inserted into the communication hole 41, the gas ring 6, and the buffer hole 51. Since the buffer hole 51 is communicated with the inner pipe 34 through the guide hole 52, the sensing end of the pressure sensor 22 can detect the pressure change of the inner pipe 34, and when the pipe joint 3 communicates with the fluid source, the pressure change of the gas or liquid generated by the fluid source is sensed, and then the switch signal is output through the circuit board 21.

[0028] In summary, the pipe joint 3 is detachably installed on the shell 1 by the adapter 4, so that the pressure switch device can replace the pipe joint 3 of different sizes according to the use requirement, thereby achieving the effect of facilitating the use of the pressure switch device. Similarly, the pressure switch device can also replace the damaged pipe joint 3 during maintenance, so as to achieve the effect of low maintenance cost, thereby achieving the purpose of the present application.

[0029] The above description is only the preferred embodiment of the present application, but it is not intended to limit the scope of the present application. Any person skilled in the art can make further improvements and changes on the basis of the present application without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims of the present application.

Claims

1. A pressure switch device, characterized by: The pressure switch device comprises: a housing defining a receiving space, and an outer surface of the housing being recessed to form a connecting through-hole communicating with the receiving space; a pressure sensing unit mounted on the housing and including a pressure sensor located in the receiving space; a pipe joint detachably penetrating the connecting through-hole and including a first connecting section located in the receiving space, and an inner pipe penetrating through both ends of the pipe joint; a connecting member located in the receiving space and covering the connecting through-hole, and including a communicating hole penetrating through two opposite surfaces of the connecting member and for the pressure sensor to penetrate, the connecting member being detachably connected with the first connecting section to detachably mount the pipe joint on the housing, and aligning the communicating hole with the inner pipe to allow the pressure sensor to penetrate the inner pipe; and an airflow guide block penetrating the inner pipe, the airflow guide block being recessed on one side adjacent to the connecting member to form a buffer hole for the pressure sensor to penetrate, and being recessed on a side away from the connecting member to form a plurality of guide holes communicating with the buffer hole, the guide holes having a diameter smaller than that of the inner pipe, and the guide holes being distributed around the center of the airflow guide block.

2. The pressure switch apparatus of claim 1, wherein: The first connecting section is a male screw, and the connecting member is a nut, and the connecting member is detachably screwed with the first connecting section.

3. The pressure switch apparatus of claim 1, wherein: The pressure switch device further comprises an air-tight ring arranged on the inner pipe and sleeved on the pressure sensor to close a gap between an inner wall of the inner pipe and the pressure sensor.

4. The pressure switch apparatus of claim 1, wherein: The pressure switch device further comprises a gasket arranged between the housing and the connecting member.

5. The pressure switch apparatus of claim 1, wherein: The connecting through-hole has a limiting hole portion with an opening formed on the outer surface of the housing, and a connecting hole portion with an opening formed on an inner surface of the housing and for the first connecting section to detachably penetrate, the pipe joint further includes a stop section connected with the first connecting section, the stop section is detachably penetrated in the limiting hole portion, and an outer diameter of the stop section is larger than that of the connecting hole portion to be unable to penetrate into the connecting hole portion.

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